Vacuum Heat Treatment Furnace: 2017

2017年5月25日星期四

What is heat treatment stress

The residual force of heat treatment is the stress of the workpiece after heat treatment, and the shape of the workpiece. Size and performance are extremely important. When it exceeds the yield strength of the material; It causes the distortion of the workpiece, which can cause the workpiece to crack when it exceeds the limit of the strength of the material. This is its harmful side and should be reduced and eliminated.
But under certain conditions, the control of stress can improve the mechanical properties and service life of the parts, which can be beneficial. The distribution and change of stress during heat treatment are analyzed, and the reasonable distribution of steel is of great practical significance to improve the product quality.

2017年5月19日星期五

How do you select the oil surface pressure

In the use of a vacuum quenching furnace 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 to quench indoor filling the high purity of neutral or inert gas, in order to create constant pressure on the oil, so that you can fully steel quenching and get the surface of the light. The critical quenching pressure is the lowest level of liquid pressure at the same time as the same hardening hardness under atmospheric pressure. The characteristics of critical quenching pressure and vacuum quenching oil are related to the hardening of steel.
When hardening of hardened steel by vacuum quenching furnace, it is necessary to inflate and then harden into oil. The pressure in the oil is higher than the critical quenching pressure. In general, you can adjust to about 5 times 104Pa, but not below 1.0 x104pa. For some medium hardened steel, it also requires the use of the first gas and then the oil in the process of quenching. The pressure of the oil can be adjusted to about 1.0 times 104Pa, but not for less than 5 times 103Pa. For some good quenching hardness steel can choose air or air in this way, if with the method of gas, then choose inside. In order to prevent and reduce the pollution of the steam entering and vacuum quenching furnace heating chamber can choose to use higher air pressure, the gas should be adopted by the high purity of the inert or neutral gas. If you use a post-inflation method, you can choose a gas that is low in purity, and the pressure can be lower. If the method is not inflated, then the workpiece does not need to be inert or neutral until the oil is in the oil.

2017年5月17日星期三

The purpose and structural characteristics of vacuum high-pressure air quenching furnace

vacuum high-pressure gas quenching furnace is mainly used for the quenching of high speed steel, industrial mold steel and stainless steel. Solid solution of stainless steel and titanium alloy; The vacuum heat treatment of magnetic material and high temperature brazing and vacuum sintering, and the convection blower can also carry out low temperature tempering.
Structure features: heating chamber adopts stainless steel skeleton, new carbon felt composite material, less deformation, resistance to high temperature and high pressure air scour, long service life, easy maintenance, using graphite tube heater, easy installation and maintenance, low failure rate. Air cooled by jet cooling way, graphite nozzle circumference uniformly distributed, make a high pressure air flow is more reasonable, part of the main duct air volume size adjustable, customers can according to the characteristics of the artifacts the size of the control part of the main duct airflow, can effectively control the workpiece deformation. High speed high-pressure high flow fan, copper and copper high efficiency round heat exchanger, achieve high speed cooling. The fan can adopt single speed, two-speed, variable frequency speed regulation various ways, control the wind and cold speed. The whole metal structure can be used in the heating room to meet the requirement for the solid solution of titanium alloy and precision alloy. The electric control system adopts PLC and programmable temperature controller, and realizes the automatic, semi-automatic and manual control mode, and the operation is flexible.

2017年5月15日星期一

Characteristics and selection of vacuum tempering furnace

Vacuum tempering furnace is suitable for high speed steel, die steel, tool steel, alloy steel, titanium alloy etc. Soft magnetic material, silicon steel sheet, electrician pure iron, copper alloy and other materials bright annealing. Remove the forging parts, welding parts, cold stamping parts, and the residual internal stresses of the workpiece to prevent deformation and cracking of the workpiece.
Vacuum furnace characteristics:
The operation is convenient, manual/automatic free switch, can achieve full automatic control, fully avoid the human error in the working procedure.
Have perfect alarm system, can provide protection to the equipment effectively.
According to the characteristics of low temperature and large furnace quantity for some vacuum furnace process, the application of convection heating should be considered. To meet the demand of heating speed and temperature effect in the heat return process.
4, for some tubular, slender, thin wall parts annealing treatment, suggest that choose vertical jacket material or bottom loading structure, can effectively solve the problem of deformation.
Vacuum furnace selection reference: the user can choose the tempering temperature according to the workpiece, choose the nickel-chrome heater or the molybdenum heater. Molybdenum nickel chrome heater is the highest temperature is 700 ℃, the heater the highest temperature is 1100 ℃. The corresponding heating power is different.

2017年4月27日星期四

Safety design principle of true air hardening furnace

Quench in vacuum quench and liquid quench two kinds.The gas quench will cool the workpiece by filling the cooling room with high purity, such as nitrogen, in the cooling room.The data of low critical cooling speed of martensitic system, such as high speed steel and high carbon chrome steel, are applied to the gas quenching.The liquid quench is to heat the workpiece in the heating chamber, move it to the cooling room and fill in the high purity nitrogen and immediately send it to the quench tank, and quickly cool down.If the external quality of the demand is high, the backfire and the accumulation and softening of the workpiece vacuum quenching and the solution of solid heat solution should be carried out in a vacuum furnace.
The secondary construction part of the true air quench furnace, which affects the construction of the hearth, the furnace door and the teeth ring.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.Through mechanical model, the structural optimization of the thin segment in the design structure is carried out, and the requirements of structural safety are achieved.

2017年4月6日星期四

Small vacuum heat treatment furnace design characteristics

Vacuum heat treatment is the heat treatment technology and vacuum technology combined the two together a comprehensive technology, mainly refers to the heat treatment process of all or part of the process of vacuum. Vacuum heat treatment furnace thermal efficiency is relatively high, can realize the rapid cooling or heating work, also can realize no decarburization, no oxidation and carburizing, and so on, in addition to this, you can also take scales of the treated surface, and can also play a role skim degassing, etc, which can be processed workpiece surface brightness purification effect.
When small vacuum heat treatment furnace design USES a lot of new and high technology, the following will introduce small vacuum heat treatment furnace design features:
1, water cooling device
In order to ensure that the vacuum heat treatment furnace of the furnace shell have no deformation work under high temperature condition, etc., must be installed in a vacuum heat treatment furnace cooling device, so as to guarantee the normal work of the vacuum heat treatment furnace, can prolong the service life of vacuum heat treatment furnace.
2, low voltage large current
Vacuum heat treatment furnace adopts low voltage large current. The working voltage of vacuum heat treatment furnace is too large, arc discharge may happen, burned electric heating element, cause an accident. So the working voltage of vacuum heat treatment furnace is low, usually below 100 v.
3, vacuum heat treatment
Many insulation only in vacuum heat treatment, because the material easy to oxidation under atmospheric conditions.
4, vacuum sealing
Sealed vacuum heat treatment furnace processing components can ensure the quality of products. So the part that is installed on the vacuum furnace to ensure the sealing structure is.
5, intelligent operation
The process of vacuum heat treatment furnace metal workpieces is complex, some process to be finished in a short time, so only intelligent operation to ensure the accuracy of the processing.

2017年3月29日星期三

Metal Heat Treatment Market Report Aims To Outline and Forecast

Metal Heat Treatment Market Research Report covers the present scenario and the growth prospects of the Metal Heat Treatment Market for 2016-2020. To calculate the market size, the report considers the revenue generated from the sales of Metal Heat Treatment globally. Metal Heat Treatment Market, has been prepared based on an in-depth market analysis with inputs from industry experts.
Metal heat treatment is a method used to change the physical and chemical properties of metals. Most metal components require thermal processing to change their metallurgical and physical properties to attain the desired engineering requirements for their intended use. Metal heat treatment involves the use of a vacuum furnace in which metals are heated to a particular temperature to change their metallurgical properties.
Metal heating furnaces enable heating metals up to 1,100ºC-1,500ºC (centigrade) and subjecting them to different types of processes such as annealing, hardening and quenching, brazing, and carburizing. In metal heat treatment, the absence of air and other gasses in the furnace prevents heat transfer through convection, thereby eliminating the possibility of contamination. This process renders excellent surface finishing to heat-treated parts.

2017年3月27日星期一

The correct use of single crystal furnace maintenance on a regular basis

In the operation of single crystal furnace because always is in a state of high temperature, high and strict with other parts, because of the need to maintain the work over a long period of time, so you need to pay special attention to make the necessary maintenance on a regular basis.
1, crucible drive requirement of motion accuracy is higher, is the core equipment of the moving parts, should focus on maintenance. Axis is graphite crucible crucible support shaft, should check the cooling water, so as to avoid loss.
Crucible driven by ball screw and linear guide rail structure, are key components in crucible driver, should be kept clean, dust and debris adhesion, is strictly prohibited and daub grease on a regular basis.
2, seed crystal rotation and hoisting mechanism of maintenance
Seed crystal rotating parts and hoisting mechanism is the key of the single crystal furnace, the unit operation quality directly affects the growth of single crystal. Therefore, must also focus on maintenance.
Roll wheel box is the core of the seed crystal ascension, roll wheel box parts in general may not arbitrarily dismantled and must be pulled down, must ensure that the flexible shaft on the reinstall. Flexible shaft steel wire rope in use are not allowed to have die bending phenomenon, and in every time when blow-in check whether the wire rope is burning, if there is any damage should be timely repair or replacement of new steel wire rope.
In addition to the above two points, before each furnace should check whether the water system is open, the water temperature detection sensor installation is normal. Found a scale should be clear in time. In the process of crystal pulling, if discover the water pressure alarm or leak to take timely measures. Every batch vacuum pipeline filter to clean up once, suction pipe once every 20 ~ 30 furnace clean.

2017年3月23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.

2017年3月21日星期二

Analysis of the single crystal furnace furnace cover for profile

Single crystal furnace furnace cover is commonly oval head. Due to its good mechanical properties and processing technology. It is widely used in industry. In the production of single crystal furnace, often encountered in the welding ellipsoidal head to take over the problem. This kind of production enterprises in China are generally use manual and welding. The backward mode of processing not only processing efficiency is low, and the machining quality is difficult to meet the design requirements, the production efficiency and welding quality is affected.
Main components of the ellipsoidal head is half elliptical shell. Shell is limited by two surface objects, uniform shell thickness of each point in the midpoint of the curved surface is called shell surface, the surface formed by surface of revolution is called the revolving shell, the shell surface in the busbar rotary formed a revolving shell. Therefore, represented by an elliptical head surface in busbar elliptical head geometry.
A principle
Single crystal furnace general elliptical head takes over the shape of cylinder cover, the case is the top surface is divided into many small line segments, each segment and the adjacent two plain wire and nozzle-vessel junction line to form a quadrilateral, obtained the side length of each side of the quadrilateral can expand the quadrilateral, such one by one on all quadrilateral is the ellipse over expansion plan.
Surface is considered to be a move line in space motion trajectory, the line is called bus, bus bar in the surface in a position, known as plain wire. Available to take over the plain wire cylinder and elliptical head surface intersection; Then calculate the corresponding node. Point to the distance on the surface of the ellipse to take over the top is the prayer plain wire length.
General furnace cover elliptical head over the single crystal furnace is a common problem in practical production. We use parallel expansion method taking over a mathematical model is established, with the aid of computer promptly and accurately draw a diagram, fast and exact underground material, thus to take over the precast, slope and the curve of the head group H in uniform after clearance, improved the welding speed, improves the production efficiency and product quality.

2017年3月3日星期五

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.

2017年2月28日星期二

About the role of vacuum heat treatment furnace thermal insulation

Vacuum heat treatment furnace used in industrial processes, and has a very important role, so you understand the vacuum heat treatment furnace insulation? Insulating layer has what function? Below we together and see it.
The thermal insulation layer is generally cylindrical, so that the heat transfer effect is good, and the heat loss is small. Vacuum heat treatment furnace of the thermal insulation material and thickness, mostly oil vacuum and temperature. What role does the heat insulation layer? Is when heating the workpiece, heat insulation, thermal insulation layer of vacuum heat treatment furnace for material and structure is different, so there are different kinds.

2017年2月23日星期四

The working technology of low temperature box type heat treatment furnace

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.

2017年2月21日星期二

The vacuum heat treatment furnace in the automobile exhaust purifier manufacture concrete action

As the carrier of automobile exhaust purifier consists of casing, liner, and the catalyst components. We want to make them together and have the purpose of purifying exhaust, which would involve the components between the joint and the joint between catalyst and components. Vacuum heat treatment furnace is the use of its advantages, the success of the parts will fit together.
The vacuum heat treatment furnace in the automobile exhaust purifier manufacture concrete action
(1) the vacuum heat treatment furnace heating in vacuum, vacuum to prevent oxidation, degassing effect.
A, anti-oxidation function make the workpiece surface decarburization, carburizing, also can remove phosphorus chip and rust on the surface of the workpiece. Cleaning the surface, can make the solder and catalyst better adhere to the surface, improve the quality of the products.
B, degassing effect. Improve the purity of material surface, improve the fatigue strength, plasticity and toughness. So as to improve the mechanical properties of the workpiece and service life.
(2) the high heating temperature, skim and effectively remove oil, the evaporation of various impurities, purify surface, thus to further improve the quality of products.
(3) the vacuum heat treatment furnace heating speed control, and constant temperature zone temperature deviation is small. Can slow heating, so the workpiece temperature balance, each part temperature difference is small, the thermal stress is lesser, small deformation after forming. Can easily cooperate with various standard parts, to ensure that the product yield and quality. Welding not only fail to prevent oxidation of traditional process, and the welding part of high temperature, large temperature difference between the parts of components, the great amount of deformation after forming, could not reach the requirements of the product.
(4) the vacuum heat treatment furnace workpiece with the increase of temperature, the solubility of hydrogen will be more and more small, penetration workpiece internal hydrogen will gradually precipitate, so no vacuum heat treatment furnace, hydrogen embrittlement.
(5) the vacuum heat treatment is controlled by a microcomputer, small error rate, process stability and repeatability.
(6) the most important energy saving vacuum heat treatment furnace, don't need a flammable gas, and controlled atmosphere than, save raw materials, low cost, suitable for mass production.

2017年2月6日星期一

Industrial vacuum furnace pressure quenching heat treatment research

A company's latest work in pressure quenching system is to improve the processing capacity of disc type vacuum heat treatment furnace, the company to obtain the high hardness can meet the strict parts as stress strain, the research objective of the fire. The adoption of pressurized gas in the vacuum furnace cooling system, improves the performance of the process and parts to improve, so lead to pressure vessel furnace in the whole industry. Because of the limitation of the furnace under positive pressure operation is very strict, this requires that the operator must strictly abide by rules of operation when using the device. The service life of the furnace due to the performance of the high pressure change, so must be of high pressure gas quenching furnace is often established test and operation procedures.
The pressurized gas quenching process is implemented by adopting high speed circulation gas, in order to achieve a high cooling rate, high velocity gas absolute pressure in l.s xlo5Pa. The low pressure quenching eliminates several atmospheric pressure under the strain of fire restrictions, reduces the vacuum container manufacturing costs, and greatly reduce the consumption of gas quenching. The characteristics of engineering design as soon as possible, the feasibility of repair was the pressure to consider the main problem in the design of quenching system. This furnace design feature is to emphasize the most popular and convenient, which in order to maintain and easy to close to the stove hot when charging, furnace furnace chamber is interrupted.

2017年1月16日星期一

The cause of the vacuum furnace graphite electrode loss analysis and derogation measures

The service life of graphite electrode in a certain extent determines the production capacity of the hard zinc vacuum distillation furnace and the production cost, the article the cause of the vacuum furnace using graphite electrode loss is analyzed, combining with production practice, put forward the measures to reduce the loss of graphite electrode, received good results.
Using horizontal vacuum furnace hard zinc processing, recovery of indium, germanium, zinc and other valuable metals, muffle furnace with original treatment technique - compared to the electric furnace process, recovery of valuable metals, security, environmental protection and other indicators have greatly improved, created a considerable economic and social benefits. Hard zinc vacuum distillation furnace with graphite electrode as a heating element, converts electrical energy into heat energy, is crucial parts in the vacuum distillation furnace, to some extent, it determines the work ability of the vacuum furnace.
In the production of vacuum distillation furnace processing hard zinc process, although the graphite electrode is easy to consume parts, but if its service life is too short, frequent replacing electrode, not only increase the workload of maintenance and the production cost, and the serious influence production furnace smooth continuation of time, thereby significantly reducing the hard zinc processing. So the analysis of the factors affecting the service life of graphite electrode, and find out effective countermeasures, improve the service life of the electrode, to ensure production run smoothly, improve the hard zinc processing and reduce the production cost is of great significance.

2017年1月9日星期一

The working principle of the vacuum quenching furnace

The vacuum quenching have liquid quenching and quenching. Gas quenching line artifacts to cooling after vacuum heating chamber filled with high purity gases (such as nitrogen for cooling. Practical in gas quenching with high speed steel and high carbon high chromium steel martensite critical cooling rate is low.
Liquid quenching is the workpiece heated in the heating chamber, moved to the cooling chamber filled with high purity nitrogen and immediately into the quenching tank, rapid cooling. If demand high quality of appearance, workpiece vacuum quenching and tempering after solid solution heat to solve and accumulation to soften should still take place in a vacuum furnace.

2017年1月3日星期二

Oil and gas quenching vacuum furnace quenching big difference

Vacuum furnace is refers to under the vacuum state of heating furnace, vacuum furnace is divided into a lot of kinds, have spirit oil quenching, quenching, annealing, tempering and other categories, including vacuum gas quenching furnace and vacuum oil quenching furnace is the most commonly used, although the two kinds of vacuum furnace name is similar, but the gap between the two are high, let's take a look at what are the differences between the two?
1. In the case of type furnace and power equal, oil quenching furnace to some wide adaptation of sex, poor gas quenching furnace to big diameter and the hardenability of steel narrow applicable.
2. In the specification of the furnace, the cost of gas quenching oil quenching, the reason is high because the nitrogen is bigger than the oil consumption, the cycle time is longer, the feed box and furnace components under the cold and heat exchange of the often more wear and tear.
3, with diffusion pump gas quenching furnace to do high speed steel, beryllium copper, stainless steel, titanium alloy higher-value products, and can be used in the vacuum tempering. The oil quenching furnace is not.
4, to the hardenability of good steel, gas quenching is better than the oil quenching of tissue, deformation and surface finish is better.

订阅：博文 (Atom)