The characteristics of low pressure vacuum carburizing

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.

What are the purposes of vacuum oil quenching furnace?

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

The vacuum gas quenching furnace safety design principle

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.

Efficient vacuum furnace heat treatment practice

   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.

Vacuum furnace heat treatment of common sense

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.

Low temperature box type heat treatment furnace is introduced for details

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.

How do small vacuum quenching furnace selection

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.

What are the kinds of controlled atmosphere heat treatment furnace

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;