Vacuum Heat Treatment Furnace: 2016

2016年12月28日星期三

The characteristics of low pressure vacuum carburizing

Low pressure vacuum carburizing, can greatly reduce the production cost and increase equipment utilization rate. This is because the low pressure vacuum carburizing atmosphere is very simple, strong permeability period only acetylene or propane, diffusion period only nitrogen gas, and pressure is very low, so the cost of using atmosphere significantly reduced. In addition, due to the low pressure carburizing and the characteristics of the equipment and process, can be high temperature carburizing, so increasing the carburizing temperature, can greatly shorten the carburizing time.
Because of the low pressure vacuum carburizing to carburizing process control system can accurately control, so the processed workpiece has good repeatability, and the workpiece deformation is small, the surface light, without mechanical processing of the reentry after carburizing.
Low pressure vacuum carburizing technology has greater flexibility, the equipment can be used as a stand-alone equipment, can also with cold working together as a production line. The device itself can be either cycle type, suitable for small batch and many varieties of production situation. Can also be a continuous type carburizing by multiple heating chamber, gas quenching chamber, oil quenching chamber, in and out of the chamber, vacuum system, workpiece automatic transportation system, etc, suitable for mass production. In addition, the furnace, the furnace is very simple, only 0.5 h to enter each furnace blow-in operating state.
Low pressure vacuum carburizing using cold wall vacuum technology, no ignition and no fire danger, no pollution, clean, safe, equipment operation is simple, easy to maintenance.

2016年12月23日星期五

What are the purposes of vacuum oil quenching furnace?

For vacuum oil quenching furnace we may not be very understand, today we will learn about the it has those purposes. USES: widely used in ceramics, metallurgy, electronics, glass, chemical, mechanical, refractories, the development of new materials, special materials and building materials production and experiment.
Features: open the door way: side open, lock, door can rotate
1, control accuracy: + / - 1 ℃ furnace temperature uniformity: + / - 1 ℃ (according to the size of the heating chamber and decide).
2, easy to operate, programmable, PID self-tuning, automatic heating, automatic heat preservation, cooling, without unattended. Can match with the computer communications through computer operation furnace (launch electric furnace, to stop the electric furnace, suspension temperature and set temperature curve, store temperature curve, history curve, etc.), software free see: computer control system.
3, quick heating (heating rate of 1 ℃ / h to 40 ℃ / min adjustable).
4, energy saving (furnace is made of imported fiber, high temperature resistant, resistant to thermal shock quench)
5, furnace by the delicate coating corrosion resistance to acid and alkali, furnace and furnace isolation used air-cooled furnace wall temperature close to room temperature
6, the double circuit protection (overtemperature and overpressure, superfluid, section I, power outages, etc.)
7, furnace imported refractory materials, heat preservation performance is good, high heat resistance, resistance to thermal shock
8 categories, temperature: 1200 ℃ 1400 ℃, 1600 ℃, 1700 ℃ 180 ℃ o five

2016年12月19日星期一

The vacuum gas quenching furnace safety design principle

Vacuum gas quenching furnace secondary structural components, the influence of furnace shell, furnace door equipment safe sex and the structure of the ring gear. Because the vacuum gas quenching furnace in positive pressure and negative pressure alternating repeated application characteristic, in order to ensure the safe sex equipment application complete equipment of economy at the same time, the furnace shell and the ring gear after practice of calculation method, the check figure method, adopt the method of infinite element analysis to construct safe sex. After a mechanical model for the design structure of thin link structure optimization, to achieve the requirement of the construction safe sex.

2016年12月15日星期四

Efficient vacuum furnace heat treatment practice

Vacuum furnace is in a vacuum environment to welding products for smelting metal, firing of ceramic and metal welding construction has a strong power, such as vacuum furnace performance is superior in terms of heat treatment is the industry's leading equipment, can add magnetic vacuum perfect realization, sintering, welding, construction means such as quenching, so let the vacuum heat treatment furnace with efficient way?
1, the heat insulation used in the vacuum furnace components, should take 369 law, the introduction of furnace charging quantity as the basis of calculation and rules, can effectively shorten the time of heat preservation and heat, make the production more simple and more meaningful. And as a result of the workpiece is put footprint size different size is different also, so you should take a different formula, make the heat insulation of the workpiece more reasonable, not only increases the production efficiency and saves the cost of production.
2, if it is in sealed box furnace for heat treatment, then take the 369 law can improve the efficiency of controllable gas heat treatment, for economic and social benefits of ascension.
3, 369, law is the law of the application of vacuum heat treatment furnace, the 369 law can determine the heat preservation time and hardening time of different materials, and then save the construction time, heat preservation time short steel also reduced in high temperature and residence time, such as common austenitic grain size, itself is small if can get smaller martensite after quenching organization, obviously improve the toughness and plasticity.

2016年12月12日星期一

Vacuum furnace heat treatment of common sense

1. Vacuum furnace processing of titanium alloy, unfavorable use nitrogen as cooling gas, because titanium and nitrogen reaction at high temperature, forming the golden titanium nitride.
2. The vacuum furnace active connection parts are all made of type O rubber ring sealing connection, this part is cooled.
3. The workpiece quenching under a vacuum, vacuum quenching oil should be used, the oil has a lower saturated vapor pressure.
4. Vacuum furnace maintenance should be in the condition of vacuum or pure nitrogen inflator, avoid inspiratory when not in use at ordinary times, moisture absorption.
5. The domestic vacuum furnace pressure increase rate should be no greater than 1.33 Pa/h, some enterprises abroad standard Pa 0.67 / h
6. Vacuum heating is given priority to with radiation, should keep distance between artifacts in the oven.
7. In the process of heating workpiece and furnace material will be deflated, resulting in a vacuum.
8. Vacuum tempering, vacuum annealing, vacuum heating of vacuum solid solution treatment and aging temperature generally the same as the conventional heating temperature when processing.
9. Vacuum tempering furnace should have fast cooling device. Cooling water pressure should be greater than 0.2 Mpa, the flow should be adjustable.
10. The cooling gas: steel generally USES ninety-nine point nine nine five percent purity of nitrogen, nitrogen or argon gas, high temperature alloy with ninety-nine point nine nine nine percent of titanium alloy with ninety-nine point nine nine five percent argon gas.
11. Temperature: after into the workpiece, the general first drainage to Pa 6.67 can heat up when heated.

2016年12月8日星期四

Low temperature box type heat treatment furnace is introduced for details

Low temperature box type heat treatment furnace used for tempering and non-ferrous metal heat treatment. The heating mode can be divided into direct heating and separate heating. Direct heating thermal efficiency is high, but the workpiece tend to be direct thermal radiation caused by high temperature electric heating element local overheating, the solution is to put insulation plate between the workpiece and the electric heating element (such as charging box, etc.). Separation of heating is to use hot fan will be in the hot gas into the furnace. Separate low temperature electric box furnace used in the practical application is less, most used in the workshop or well type box-type furnace heat treatment at low temperature.

2016年12月4日星期日

How do small vacuum quenching furnace selection

You can see in the market a lot of kinds of small vacuum quenching furnace type, if I don't know which one is more suitable for yourself, it is easy to the edition. Now, we have to support a move to you, tell you how to choose a small vacuum quenching furnace.
1, the choice of small vacuum quenching furnace heating chamber
Graphite reflector screen: the commonly used on small vacuum quenching furnace has felt hard and soft felt two kinds, suitable for general steel quenching. High temperature brazing, powder metallurgy and sintering, etc.
Metal heat insulation screen: generally used in vacuum furnace, which has two kinds of stainless steel and molybdenum. Molybdenum reflector screen is suitable for high temperature and high environmental requirements within the furnace material quenching. Stainless steel rice shoot screen is suitable for the tempering, annealing, aging, vacuum aluminum brazing, etc., some of the low temperature furnace type choice.
2, the choice of the vacuum degree
Quenching heat treatment can be used in the vacuum (generally limit p 4 x10-1 a) by using two stage pump (pump and roots pump) such as bearing steel, vacuum heat treatment of die steel, structural steel, etc.
High vacuum for some products, such as (high temperature alloy, titanium alloy, magnetic materials, such as vacuum heat treatment or high temperature brazing. Optional tertiary pump (pump before. Roots pumps, diffusion pumps, etc.) general requirements the limit of vacuum degree in 10-4 pa.
3, the choice of control system
Standard configuration: to inlet temperature controller and programmable controller as the core, realizes the programmable, manual and automatic temperature control.
Computer control system, industrial computer and programmable controller as the core process programming, storage, to make statements. Can computer independent operation, automatic, manual, process programming, etc.
: computer group control system with industrial computer as the core of many sets of vacuum furnace monitoring, collecting data, operation, report management, etc. As one of the high-tech control system.

2016年12月1日星期四

What are the kinds of controlled atmosphere heat treatment furnace

Controlled atmosphere heat treatment furnace, depending on the assignment form can be divided into two categories, cycle type and continuous type, and in two categories according to different ways of furnace type structure and movement is divided into the following categories: periodic furnace, such as the sealed box furnace, multi-purpose furnace) and pit type furnace, etc., applicable to many varieties of small batch production, can be used for the bright quenching, bright annealing, carburizing and carbonitriding heat treatment. Continuous furnace, such as push rod furnace, rotary hearth furnace and continuous type controlled atmosphere carburizing production line, such as use of mass production, can be bright quenching, tempering, carburizing and carbonitriding heat treatment, etc.
The basic structure of the controlled atmosphere heat treatment furnace and general heat treatment furnace is basically the same, its design and calculation method and general heat treatment furnace is also the same. Single due to access to controlled atmosphere in the furnace, and therefore should have some special requirements in the structure, in the aggregate, has the following nine aspects: 1. The chamber of a stove or furnace sealing; 2. Maintain positive pressure in the furnace; 3. Uniform furnace atmosphere; 4. The use of carburizing brick; 5. Use appropriate heating elements; 6. Set the ventilation exhaust system; 7. Set the former room, room, after quenching tank and furnace sealing; Mechanical front-rear device; 8. 9. Set safety explosion-proof device;

2016年11月28日星期一

The vacuum system vacuum heat treatment furnace

Vacuum heat treatment furnace of the vacuum system in general by the vacuum pump, vacuum valve, vacuum measuring instrument, cold trap, pipes and other parts, the following several kinds of common vacuum system, low vacuum system, applicable to the vacuum degree in 2 ~ 1333 pa range of vacuum heat treatment furnace, such as drainage well type vacuum furnace using this system.
Have mechanical booster pump vacuum system, suitable for vacuum degree in 1.33 ~ 10 -- creates pa range of vacuum heat treatment furnace, vacuum quenching furnace is widely adopted by this system. High vacuum system with pump and vacuum system, applicable to the vacuum degree in 1.33 x10 -- squared x10 ~ 6.6 -- 4 pa range of vacuum heat treatment furnace, vacuum annealing furnace, vacuum brazing furnace using this system.

2016年11月24日星期四

The advantages and disadvantages of outside type vacuum heat treatment furnace is analyzed

The advantages and disadvantages of vacuum heat treatment furnace is mainly embodied in what respect, zhengzhou branch electric furnace co., LTD., for you to share: outside the advantages of vacuum heat treatment furnace mainly displays in: 1. Simple structure, easy to construct, or use the ordinary heat treatment resistance furnace modification of the original; 2. The vacuum chamber volume smaller, less displacement, furnace tank in addition to the work piece, there are few other need to gas components, and thus put less gas (no insulation panel structure, etc.), easy to achieve high vacuum; 3. Because the electric heating element is in an external heated, there is no vacuum discharge problem; 4. The stove no more mechanical action program, simple operation, low failure, convenient maintenance; 5. Do not contact with lining, high temperature vacuum furnace workpiece in high temperature without the possibility of chemistry; 6. Compared with internal heating type vacuum furnace, because of its simple structure, under the same load, its cost is only part of the internal heating type vacuum furnace 1/2 - a third; From maintenance, service life and reliability evaluation, more practical. But at the same time there are still some defects external heated vacuum heat treatment furnace, mainly displays in: 1. Low heat transfer efficiency of the furnace, heating workpiece slower; 2. The furnace tank material, furnace temperature is generally maintained at below within the range of 1000-1000 ℃; 3. Part of the furnace tank exposed to atmosphere, although you can set the heat shield, but heat loss is still very big; 4. The furnace heat capacity and thermal inertia is very big, control more difficult; 5. The service life of furnace tank is shorter.

2016年11月21日星期一

In the process of vacuum quenching furnace operation must pay special attention to what

Vacuum quenching furnace by furnace, oven, heating element, ventilation and control system, etc. In the process of vacuum quenching furnace operation must pay special attention to:
(1) must be completely before starting the row into methanol cracking furnace pipe in the air;
(2) the methanol is harmful to human body, environment, storage and transportation pipeline is necessary to prevent leakage;
(3) the furnace gas emission of CO and H2 flammable, explosive, toxic, should be in full burning oven;
(4) check the circulating cooling water, mixing fan, atmosphere pressure, furnace bottom sealing, thermocouple is normal or not. After continued use, may attack in methanol cracking furnace carbon black, scattered within the chamber of a stove or furnace reactor, every batch shall be in addition to carbon.
Works to do more than vacuum quenching furnace.

2016年11月17日星期四

The vacuum system vacuum heat treatment furnace

Vacuum heat treatment furnace of the vacuum system in general by the vacuum pump, vacuum valve, vacuum measuring instrument, cold trap, pipes and other parts, the following several kinds of common vacuum system, low vacuum system, applicable to the vacuum degree in 2 ~ 1333 pa range of vacuum heat treatment furnace, such as drainage well type vacuum furnace using this system. The vacuum system with mechanical booster pump, suitable f or vacuum degree in 1.33 ~ 10 -- creates pa range of vacuum heat treatment furnace, vacuum quenching furnace is widely adopted by this system. High vacuum system with pump and vacuum system, applicable to the vacuum degree in 1.33 x10 -- squared x10 ~ 6.6 -- 4 pa range of vacuum heat treatment furnace, vacuum annealing furnace, vacuum brazing furnace using this system.

2016年11月16日星期三

How to pay special attention to the heat treatment and stronger manufacturing

Heat treatment is the key of the resolution commodity function, stature and reliability, the level of heat treatment is the center of manufacturing competition force elements, heat treatment in China is not due notice, however, and the quality of heat treatment industry itself know indifference, that there is a big distance with the international leading level.
Backward heat treatment has become the bottleneck of Chinese manufacturing by the big teams. The author thinks that, for change This kind of situation, the primary demand changing ideas, understanding the effects of heat treatment on the manufacturing and important, clearly know the situation of heat treatment of backward and damage, explore the causes, and talents together Catch up with the world leading level.
The advantages of using heat treatment skills, abundant information potential, leading the development of new products is important way of autonomy for decorating. Such as ultra high strength steel in the process of form machine gear and its application of high-power hydraulic coupler effect; After heat treatment of progressive die stature to promote the development of high-speed cold heading machine; Nano Zr2O honeycomb composite coating decreased by heat resistant alloy blade temperature becomes a new generation of aircraft engine key skills. From the current urgent need in the research of strategic equipped with also reflects the important effect of heat treatment skills.

2016年11月13日星期日

The influence factors of heat treatment

Today we'll talk for everyone in the use of vacuum heat treatment furnace heat treatment when the influence factors of heat treatment:
1. Heat treatment the material of products must comply with the relevant national standards;
2. The use of vacuum heat treatment furnace can meet the technical requirements of workpiece;
4. Must develop a set of perfect processing plan of right;
5. Inspection equipment and personnel to the corresponding level;
6. Have a relatively liberal leader
As long as you later when using vacuum heat treatment furnace for heat treatment can do more than six, believe that the heat treatment product performance will be very good.

2016年11月10日星期四

Mold vacuum heat treatment

Vacuum heat treatment technology is developed in recent years, a new type of heat treatment technology, it has the characteristics of it is desperately needed in the mould manufacturing, such as preventing heating oxidation and decarburization, vacuum degassing and degassing, eliminate hydrogen embrittlement, so as to improve the plasticity and toughness of materials (parts) and fatigue strength. Vacuum heating slowly, parts smaller temperature difference between inside and outside factors, determines the parts and small deformation caused by vacuum heat treatment process.
Heat treatment process of the successful development and application of computer simulation technology, that makes it possible to mold the intelligent heat treatment. Due to the mold production of small batch (even piece), the characteristics of many varieties, as well as to the performance requirements of high heat treatment and are not allowed to appear the characteristics of the waste, and makes mould intelligent heat treatment must be. In foreign developed countries, such as the United States, Japan, etc., in terms of vacuum high-pressure gas quenching, development is fast, the main target is mold.
Mold is mainly used in the vacuum heat treatment is vacuum oil cold hardening, vacuum air cooled vacuum quenching and tempering. To maintain the artifacts, such as mold excellent characteristics of vacuum heating and cooling agent and the choice of cooling process and is very important, die quenching process mainly adopts oil cooled and air cooled. Machining of mould for after heat treatment is no longer working face, as far as possible by vacuum tempering after quenching, vacuum quenching workpiece (mould), in particular, it can improve the surface quality of the related mechanical properties, such as fatigue, surface brightness, corrosion resistance, etc.

2016年11月9日星期三

Aluminum alloy heat treatment technology

1, the principle of the aluminum alloy heat treatment
Aluminum alloy casting heat treatment is to choose a certain heat treatment specification, control the heating rate rises to a corresponding temperature cooling, heat preservation time to must speed to change its alloy, its main purpose is to improve the alloy's mechanical properties, enhance the corrosion resistance, can improve the processing, get the size stability.
2, the characteristics of the aluminum alloy heat treatment
As is known to all, for carbon steel, immediate access to the high hardness after quenching, and the plastic is very low. But for aluminum alloy and otherwise, the aluminum alloy after quenching, higher strength and hardness is not immediately, as for the plastic instead of down, instead of rose. But this kind of alloy after quenching, placed a period of time (e.g., after 4 ~ 6 days and nights), strength and hardness will be significantly increased, and the plastic is significantly reduced. The strength and hardness of aluminum alloy after quenching grow along with the time and improve the phenomenon, referred to as aging. Aging can occur at room temperature, according to the natural aging, can also be higher than the room temperature at some stage in the temperature range (100 ~ 200 ℃), called artificial aging.

2016年11月3日星期四

Hydrogen Supply Methods For Heat Treating Operations

Many manufacturing processes today rely on hydrogen as an important protective and reducing atmosphere, especially in the production of stainless steel alloys. The method of gas delivery should be carefully evaluated to optimize production efficiency and to minimize manufacturing costs.
Hydrogen has been used in both pure form and in gas mixtures for many years in thermal and metallurgical processes such as sintering, brazing, annealing, powder coating, metal injection molding and welding operations.
Improvements in hydrogen production technology are offering new, cost-effective and environmentally sound options for metal producers. In weighing these options, metallurgists and heat treaters must consider the location of their facilities, hydrogen-use patterns, current average hydrogen consumption and estimated future needs; as well as storage, siting, regulatory and maintenance issues. It is also necessary to take into account the level of hydrogen purity required for a specific process.
Hydrogen generators provide a particularly attractive solution for captive or commercial heat treating operations that process stainless steel components, operate 24/7 and have furnaces requiring high- purity gas. In fact, on-site generators are ideal for locations where hydrogen delivery and storage is difficult or prohibited.

2016年10月31日星期一

Graphite on the effect of vacuum heat treatment

Graphite in the vacuum furnace application role in the development of growing, not only simplify the design and manufacture of vacuum furnace, but also greatly reduces the metal consumption, save the cost. Both economy and technology have very significant!
Using graphite as heater in vacuum resistance furnace displays in: the advantages of graphite with excellent properties can meet the various requirements of vacuum resistance furnace heating elements; Processing is convenient, can according to need to be processed into rod, tube, plate and so on to adapt the demand of all kinds of vacuum resistance furnace heating elements; Simple structure, easy installation and disassembly, more convenient than other metal heating element; Cheap, cheap.
Graphite as a kind of very good energy conservation and environmental protection material, with the development of modern science and technology and industry, continue to broaden its application domain, not only the mechanical industrial vacuum heat treatment furnace equipment, more become an important raw material in the field of high-tech new compound material, and show a more and more important role in national economy.

2016年10月26日星期三

Aluminum alloy heat treatment technology

2016年10月23日星期日

Three sworn brothers of the vacuum heat treatment furnace

"Three sworn brothers of the vacuum heat treatment furnace
The classification of the vacuum heat treatment furnace many confusion, today for you in detail about the vacuum heat treatment furnace, the three major points to according to use can be divided into the vacuum quenching furnace, vacuum tempering furnace, vacuum annealing furnace "three brothers".
1, vacuum quenching furnace; Vacuum quenching furnace can be divided into the vacuum oil quenching furnace and vacuum gas quenching furnace.
Vacuum oil quenching furnace is suitable for steel, spring steel, stainless steel, bearing steel, high temperature alloy steel such as vacuum heat treatment. Its main characteristic is wide applicable data size, strong hardenability, low capital and quenching oil can be repeated use. Deficiencies; The deformation relative to a few bigger, workpiece follow-up needs cleaning. Vacuum oil quenching furnace and three from the layout can be divided into double chamber furnace chamber furnace, etc.
Vacuum high-pressure gas quenching furnace is suitable for high speed steel, stainless steel, steel and so on some vacuum heat treatment of hardenability better data, characterized by small parts deformation, don't need cleaning after heat-treatment. Deficiencies have quenching gases Can't take back, capital is higher. Vacuum high-pressure gas quenching furnace from the layout can be divided into horizontal and vertical two kinds. Horizontal can be divided into single room, double room and 3 rooms, etc. The application of the vertical ring shape, tubular and long rod parts heat treatment. High vacuum pneumatic quenching furnace quenching pressure is usually 2 b a r ~ 10 b r a. According to the needs of users can select parts suitable for pressure of furnace type.
2, vacuum tempering furnace, vacuum tempering furnace can be divided into the single room, double room, and vertical usually choose nickel chromium with highest heating temperature is 800 ℃. Vacuum tempering furnace usually applicable requirements after tempering parts appearance of light, no oxidation color.
3, vacuum annealing furnace, vacuum annealing furnace can be divided into single rooms, double rooms and vertical. Vacuum annealing furnace can be selected in high temperature, low temperature, according to the parts data (in the high temperature of 800 ℃ ~ 1350 ℃, low temperature 800 ℃).

2016年10月19日星期三

The process of heat treatment

Heat treatment process generally includes three heating, heat preservation, cooling process, sometimes only two heating and cooling process. The process to connect to each other, completely.
Heating is one of the important process of heat treatment. Heating of metal heat treatment method are many, the first is to use charcoal and coal as a heat source, in the application of liquid and gas fuel. The application of electric heating is easy to control, and no environmental pollution. The heat source can be used to direct heating, but can be by molten salt or metal, and floating particles with indirect heating.
Metal heating workpiece when it is exposed to the air, often occur oxidation and decarburization (that is, the surface carbon content lower) steel parts, the performance on the surface of the parts after heat treatment have a bad effect. Thus metals usually should be in a controlled atmosphere or protective atmosphere, molten salt and a vacuum heating, coating or packing method to protect the heating is also available.
The heating temperature is one of the important process parameters of heat treatment process, selection and control of heating temperature, is a major problem to ensure the quality of heat treatment. Heating temperature is processed and varies the purpose of the metal material and heat treatment, but is usually heated to above phase transition temperature, in order to obtain high temperature. Another change will take time, so when the heating temperature of metal surface is achieved, still must in the temperature keeping time, make internal and external temperature, the microstructure change completely, this paragraph of time is called the heat preservation time. Heating with high energy density and surface heat treatment and heating speed, generally there is no heat preservation time, and the chemical heat treatment of heat preservation time tend to be long. Cooling is indispensable in the process of heat treatment process steps, cooling method for craft different and different, main is to control the cooling rate. General annealing cooling speed of the slowest, normalizing the cooling speed faster, quenching cooling speed is faster. But also with different steel grade have different requirements, such as empty hard steel can be hardened by normalizing the same cooling rate.

2016年10月17日星期一

Introduction to the vacuum furnace automatic control system

Brazing process of the necessary equipment, its performance fit and unfit quality directly affect the brazing quality of the products. Vacuum furnace system is mainly composed of vacuum system and heating system and related control equipment. Vacuum system by the mechanical pump, diffusion pump, the main valve, bypass valve and high vacuum flapper valve, etc. Mechanical pump for coarse vacuum device and its power is the three-phase ac motor, high vacuum oil diffusion pump for high vacuum device, with the help of a former level of mechanical pump and the role of oil diffusion pump and electric heating extraction of the high vacuum degree requirements, all through the contactor control. Heating system is composed of heating power and heating element, heating power magnetic voltage regulator, using dc excitation power supply for non-contact smooth stepless voltage regulation of load the dc excitation power supply controlled by power governor, governor using temperature control and power! Free toe thermocouples detect the temperature of the current value and the difference between the set value, the PID arithmetic, dc signal output, control magnetic voltage regulator of magnetic saturation voltage, and then according to the set temperature control curve of temperature controller to realize the heating current and temperature automatic control. Vacuum protection automatic control system of the control goal is: 1 manual pump can qigong can realize automatic; Instrument shows vacuum degree, and the manual or automatic control in accordance with the requirements of the vacuum brazing process of related work steps; Temperature by using temperature controller and thermocouple and a trigger to realize automatic computer program control and manual control, digital display, automatic recording, overtemperature and water, automatic alarm, high in the greenhouse and chamber of vacuum cooling.

2016年10月13日星期四

Nitrogen - vacuum heat treatment the important auxiliary facilities

Nitrogen, sounds like a "loner" word, in fact, it is widely used in national economy and life, especially in the casting industry, nitrogen is often used to deal with the vacuum heat treatment furnace and recycled purging, prevent the formation of metal surface oxidation and reduce the dross.
When steel in the vacuum furnace heated, if high vacuum degree, the volatilization of the alloying elements in order to prevent the workpiece material, need to recharge the right amount of nitrogen in the furnace, to trace the pressure of the gas from the oven.
In the process of vacuum heating oil quenching vacuum quenching, sometimes to ensure or improve the cooling ability of quench oil, before the workpiece cooling, the comparison of vacuum heat treatment is both at home and abroad are adopting advanced heat treatment method, in the vacuum heat treatment, often without the use of nitrogen.
When steel in the vacuum furnace heated, if high vacuum degree, the volatilization of the alloying elements in order to prevent the workpiece material, need to recharge the right amount of nitrogen in the furnace, to trace the pressure of the gas from the oven.
In the process of vacuum heating oil quenching vacuum quenching, sometimes to ensure or improve the cooling ability of quench oil, before the workpiece cooling, to back plenty enough nitrogen in vacuum furnace. In high pressure gas quenching, need to quickly to the vacuum furnace in filling the above an atmosphere of nitrogen. Used in the steel bending steel pipe bender) vacuum tempering, the need to recharge after vacuum nitrogen to achieve uniform heating furnace protection gas circulation, and realize the fast cooling after tempering.
Overall vacuum heat treatment furnace using the chemical stability of nitrogen, the inert nature, at the time of heat treatment, back filling nitrogen, to adjust the vacuum furnace, prevent the volatilization of metal elements; When quenching, recharge nitrogen, achieve the goal of improve the cooling capacity.

2016年10月11日星期二

The vacuum furnace and intermediate frequency electric furnace heat treatment techniques

Vacuum furnace and intermediate frequency electric stove had a very good development prospect in the field of hot working, used in heating, rolling, forging, bending and heat treatment (quenching), the welding process of induction heating. The vacuum furnace and intermediate frequency electric furnace heat treatment techniques?
1. Vacuum furnace processing of titanium alloy, unfavorable use nitrogen as cooling gas, because titanium and nitrogen reaction at high temperature, forming the golden titanium nitride.
2. The vacuum furnace active connection parts are all made of type O rubber ring sealing connection, this part is cooled.
3. The workpiece quenching under a vacuum, vacuum quenching oil should be used, the oil has a lower saturated vapor pressure.
4. Vacuum furnace maintenance should be in the condition of vacuum or pure nitrogen inflator, avoid inspiratory when not in use at ordinary times, moisture absorption.
5. The domestic vacuum furnace pressure increase rate should be no greater than 1.33 Pa/h, some enterprises abroad standard Pa 0.67 / h
6. Vacuum heating is given priority to with radiation, should keep distance between artifacts in the oven.
7. In the process of heating workpiece and furnace material will be deflated, resulting in a vacuum.
8. Vacuum tempering, vacuum annealing, vacuum heating of vacuum solid solution treatment and aging temperature generally the same as the conventional heating temperature when processing.
9. Vacuum tempering furnace should have fast cooling device. Cooling water pressure should be greater than 0.2 Mpa, the flow should be adjustable.
10. The cooling gas: steel generally USES ninety-nine point nine nine five percent purity of nitrogen, nitrogen or argon gas, high temperature alloy with ninety-nine point nine nine nine percent of titanium alloy with ninety-nine point nine nine five percent argon gas.
11. Temperature: after into the workpiece, the general first drainage to Pa 6.67 can heat up when heated.

2016年10月8日星期六

What is a vacuum heat treatment furnace?

Two professional vacuum heat treatment of vacuum technology and heat treatment technology that combines an integrated, refers to the whole and part of heat treatment process in a vacuum. Our country could be divided into low, medium and high vacuum and high vacuum. At present most of the vacuum heat treatment furnace work vacuum degree in 1.33 ~ 1.33 x 10 ˉ & sup3; Pa.
Vacuum heat treatment can achieve almost all heat treatment process, such as quenching, annealing, tempering, carburizing, nitriding, during the quenching process can realize gas quenching, quenching oil, water nitrate quenching, quenching, etc., can also be vacuum brazing, sintering and surface treatment, etc. Vacuum heat treatment furnace thermal efficiency is high, which can realize the rapid heating and cooling, which can realize no oxidation and decarburization, carburizing, can remove phosphorus crumbs on the surface of the workpiece, and has the effect such as degreasing degassing, so as to achieve the surface brightness purification effect. Generally speaking, the processed workpiece in the heating furnace is slow, and internal temperature difference is small, the thermal stress is small, so little deformation. Product qualified rate is high. Can reduce costs, have degassing effect, so as to improve the mechanical properties of the work and life. Good working environment, safety operation, no pollution and no pollution. Be processed workpiece no hydrogen embrittlement risk, to prevent surface of the titanium and refractory metal shell hydrogen embrittlement, stability and repeatability of vacuum heat treatment process. A series of advantages, the development of vacuum heat treatment equipment and technology is more and more attention and applied more and more widely.

2016年9月29日星期四

Vacuum heat treatment ten big magic weapon

Vacuum furnace is widely used in modern industrial production, but for his skill in vacuum heat treatment is a lot of people don't understand. Our company is a high technology, strength after induction heating equipment suppliers, is willing to work with everyone together to discuss this problem today.
1. Vacuum furnace active connection parts are all made of type O rubber ring sealing connection, this part is cooled.
2. The vacuum furnace processing of titanium alloy, unfavorable use nitrogen as cooling gas, because titanium and nitrogen reaction at high temperature, forming the golden titanium nitride.
3. Vacuum tempering furnace should have fast cooling device. Cooling water pressure should be greater than 0.2 Mpa, the flow should be adjustable.
4. Vacuum furnace maintenance should be in the condition of vacuum or pure nitrogen inflator, avoid inspiratory when not in use at ordinary times, moisture absorption.
5. The domestic vacuum furnace pressure increase rate should be no greater than 1.33 Pa/h, some enterprises abroad standard Pa 0.67 / h
6. Vacuum heating is given priority to with radiation, should keep distance between artifacts in the oven.
7. In the process of heating workpiece and furnace material will be deflated, resulting in a vacuum.
8. Vacuum tempering, vacuum annealing, vacuum heating of vacuum solid solution treatment and aging temperature generally the same as the conventional heating temperature when processing.
9. The workpiece quenching under a vacuum, vacuum quenching oil should be used, the oil has a lower saturated vapor pressure.
10. The cooling gas: steel generally USES ninety-nine point nine nine five percent purity of nitrogen, nitrogen or argon gas, high temperature alloy with ninety-nine point nine nine nine percent of titanium alloy with ninety-nine point nine nine five percent argon gas.

2016年9月26日星期一

Vacuum heat treatment furnace by using the characteristics of water under the condition of low pressure has a low boiling point

Vacuum heat treatment furnace to the collected signals, according to the logic judgment, the issue on the system and the control signals of running state for each station. Complete skip transportation, vacuum pump, vacuum switch of each valve, given heating, cooling fan, furnace, inflated, etc.
Fault alarm function: according to the technological requirements, a vacuum furnace brazing furnace temperature display abnormal low (or overtemperature), thermocouple damaged or open circuit fault alarm functions, such as when there is abnormal or fault occurs, the fault alarm signal corresponding to the temperature of the point of failure and the touch screen display signal will appear flashing at the same time, to remind the operating personnel in a timely manner to adjust the brazing furnace temperature and to deal with failure.
Vacuum boiler working principle: using the characteristics of low water under the condition of low boiling point, rapid heating sealing furnace heat medium filled in water, high temperature steam, the heat medium water boiling evaporating out water vapor condenses on the heat exchange tube heat exchange tube in cold water, hot water supply.
Equipment in the process of the test run fails suddenly, corresponding to appear on the control instrument error shows that prompt and voice alarm prompt. Operators can control equipment operation using the troubleshooting chapter of the quick check out what kind of failure, can ask professional rapid troubleshooting, to ensure the normal test. Other environmental testing equipment in use there will be other phenomena, that is about the specific phenomenon, specific analysis and ruled out.
In the high temperature test, such as temperature change can not meet the test temperature, can check the electrical system, one by one. Such as temperature rises slowly, will see the wind circulation system, to see if a driving cycle of damper opening to normal, on the contrary, will check whether the wind circulation of motor operates normally. Such as temperature overshoot as you will need to set the setting of PID parameters. If the temperature rise directly, over temperature protection, then, the controller is out of order, must change the control instrument.

2016年9月21日星期三

Vacuum heat treatment furnace to enhance the convection heat transfer

Vacuum heat treatment furnace of the resistance furnace industry generally by the electric heating element, masonry, metal shell, oven door and oven with mechanical and electrical control system, etc. Heating power from less than a kilowatt to thousands of kilowatts. Working temperature below 650 ℃ low temperature furnace; 650 ~ 1000 ℃ temperature in the furnace; More than 1000 ℃ high temperature furnace. In the high temperature and the temperature in furnace mainly by way of radiation heating. In low temperature furnace to heat convection heat transfer, conceal electric heating element is installed inside the air duct, by forced circulation flow of gas in the fan and to enhance the convection heat transfer. Has room type resistance furnace, pit type, car type, push rod type, step type, muff type and tunnel type. Controlled atmosphere furnace, vacuum furnace, fluid particles, etc are also resistance furnace.
Vacuum furnace masters know starting power vacuum furnace, set the switch control cabinet in the automatic control location. Input the parameters of the vacuum furnace process planning into the computer. Then the workpiece with charging car smoothly away in furnace, oven door closed and locked (cover), to ensure the seal. According to the technological requirements to choose good vacuum furnace and the cooling way of cooling medium and pressure. Press the cycle start button, equipment execution procedures: vacuum heating _ _ cooling automatically. Remember to check whether the system is running normal, if there is any abnormal timely report the captain. In before, we should restore the normal pressure in the furnace, the light is normal after open the oven door (cover). When discharging, should careful operation, workpiece and tooling shall glory hole collision.
Difficult control mainly has two aspects, first, how to take off carbon to the lowest in 15 minutes; Second, according to 15 minutes after the decarburization of the residual oxygen content in liquid steel, aluminum one-time add in position, aluminum DNA can be ensured and the aluminum alloy and can guarantee. In this way, the smelting time can control between 25 to 30 minutes. Otherwise, the vacuum processing time was significantly longer. Smelting in the process of production of ultra-low carbon steel, as the extension of time, the contact between refractory material and steel liquid will lead to carbon steel back, in addition, the amount of ultra-low carbon steel because of the addition of aluminum is larger, a lot of Al2O3 inclusions produce, so the aluminum to join the sooner, the more conducive to Al2O3 inclusions floatation, the more conducive to the process after the operation and improve the quality of our products.

2016年9月19日星期一

The choice of vacuum heat treatment furnace vacuum furnace heating chamber type

The graphite type screen (hard and soft blanket) :
Applicable to the general steel quenching furnace, annealing furnace, etc. Also suitable for high temperature brazing, powder metallurgy material, ceramic material of sintering, etc.
Metal screen type (mo) :
Suitable for higher environmental requirements in the furnace materials (such as high temperature alloy, titanium alloy, stainless steel, magnetic materials, etc.) quenching, quenching, annealing; High temperature vacuum brazing and sintered powder injection molding products.
Metal screen type (stainless steel) :
Applicable to the tempering, stress relieving, aging and vacuum aluminum brazing furnace at low temperature.
The composite panel type (metal + ceramic fiber or graphite felt) :
Inner surface scouring, use between metal and graphite plate.
The choice of control system
Standard:
To inlet temperature control instrument and the temperature of the programmable controller as the core can be turned into and automatic control, the economy is applicable and reasonable allocation.
The computer control system:
With industrial computer as the core set of process programming, storage, reporting, etc. As one of the single control system. In intuitive, large storage, easy to operate.
Computer group control system:
With industrial computer as the core set of data acquisition, process programming, storage, report management, etc., as one of the many sets of vacuum furnace and other heating furnace of centralized control system.
The choice of the vacuum
General materials (such as structural steel, bearing steel, tool steel and die steel, etc.) of the vacuum heat treatment can be used in vacuum (pa) ultimate vacuum 4 x 10-1.
Higher requirements for materials, such as titanium alloy, magnetic materials, high temperature alloy, stainless steel, etc.) of the heat treatment and brazing, can choose high vacuum (ultimate vacuum for more than 4 x 10-3 pa); Should choose higher vacuum degree of vacuum aluminum brazing furnace 10-4 (pa).

2016年9月15日星期四

Vacuum heat treatment furnace to enhance the convection heat transfer

2016年9月12日星期一

The oil level of vacuum heat treatment furnace heat treatment when the pressure of selection problem

Vacuum quenching furnace in vacuum heat treatment furnace used for oil quenching heat treatment process, under low vacuum pressure and vacuum cooling capacity of quenching oil drops, for some steel, may reach the purpose of quenching. Therefore, before using the vacuum quenching furnace quenching to quenching indoor neutral or inert gas filling the high purity, create constant pressure on the oil, can realize fully quenching of steel and the surface of the light. Can get the same quenching hardness under atmospheric pressure and the minimum surface pressure is called the critical quenching pressure. The characteristics of critical quenching pressure and vacuum quenching oil and is related to the hardenability of steel.
In the use of vacuum quenching furnace for low hardenability of steel quenching, should choose to air into the oil way after quenching. The oil level of the pressure should be higher than the critical quenching pressure. The general regulation about 5 x 104 pa, but should not be below 1.0 x 104 pa. For intermediate hardenability of steel should be adopted after filling into the oil in this way. On the surface of the oil pressure can be adjusted at about 1.0 x 104 pa, but not less than 5 x 103 pa. Good hardenability steel can take air or air quenching in the form of gas, can be after filling in the vacuum furnace heating chamber into the oil, can also be the first oil after aeration. Take air way when air pressure is available in first (2.5 ~ 5) x 104 pa range selected. In order to prevent and reduce the steam to enter and contaminate vacuum quenching furnace heating room, should choose the higher air pressure, gas should be used in the high purity of neutral or inert gas. After filling, translates to lower gas purity, pneumatic pressure can be lower. Adopt the way of inflatable for quenching is artifacts into the oil are not filling the neutral or inert gas before and after.

2016年9月9日星期五

Vacuum heat treatment line selection requirements

1, the standard configuration; To inlet temperature controller and programmable controller as the core, realizes the programmable, manual and automatic temperature control.
2, the computer control system; With industrial computer and programmable controller as the core process programming, storage, to make statements. Can computer independent operation, automatic, manual, process programming, etc.
3, computer group control system; With industrial computer as the core of many sets of vacuum furnace monitoring, collecting data, operation, report management, etc. As one of the high-tech control system.

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