Protection Of Internal And Surface Of Workpiece By Vacuum Heat Treatment

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Shanghai Gehang Vacuum Technology Co., LTD. Is a have 20 years of production, research and development, the design of vacuum furnace, vacuum heat treatment processing key refers to the vacuum equipment and conditioning treatment technology of combining the new call quality technical, among them, in processing into a vacuum heat treatment is less than the atmosphere of the natural environment of an atmospheric pressure,It includes low vacuum furnace, medium horizontal vacuum furnace, high vacuum furnace and extremely high vacuum furnace, etc. Therefore, heat treatment processing is also specifically classified as atmosphere controlled and tempering treatment.

Heat treatment means that all and part of the heat treatment method are carried out under the condition of vacuum furnace. Heat treatment can complete basically all the heat treatment methods that can be involved in the basic tempering and tempering treatment, but the quality of the tempering and tempering treatment is further improved.

Compared with the basic quenching and tempering treatment, the heat treatment processing technology can also complete no air oxidation, no carburizing, no nitriding, can remove the surface layer of the phosphorus chips, and have the effect of deoiling and degassing, so as to achieve the actual effect of bright and clean surface.

1. Application of heat treatment processing technology
In fact, processing, production, processing and heat treatment technical abroad apply early, hayes enterprises of Britain and Japan vacuum furnace lab in 1968, in turn, the development of vacuum furnace quenching oil and powder material, heat treatment and vacuum furnace quenching technology on processing manufacturing industry obtained rapid development trend, from one room door furnace development trend to form a fleet of more,From the general vacuum furnace heat treatment development trend to high pressure gas quenching, vacuum furnace powder heat treatment, vacuum furnace nitriding, vacuum furnace carbonitriding and multiple co-infiltration, etc.
In our country after decades of hard work, vacuum sintering furnace manufacturer in design, manufacturing standards and quality obtained the very big promotion, domestic vacuum technology to replace vacuum technology imported from overseas increase slowly, thereby reducing the application enterprise’s product cost, make the use of heat treatment processing category rapid expansion.

2. Fundamental principles of heat treatment processing production and processing technology
Using the directional change characteristics of metal materials in the vacuum furnace, in the vacuum furnace with only 0.1MPa difference from atmospheric pressure, the change of solid thermal and kinetic model does not cause any change.In the formulation of heat treatment processing process rules, thoroughly can according to the basic principle of solid change under superheated steam, thoroughly can refer to the data information of various types of mechanism change under superheated steam.In addition, under the degassing effect of vacuum furnace, the technological performance and physical performance of metal composite materials can be improved. In the case of vacuum furnace heating, the surface elements of metal material products will volatilize.The vacuum value required for the metal material to complete the air-free oxidation heating, the surface cleaning effect, the completion of less air-free oxidation and less de-stripping.

3. Technical characteristics of heat treatment processing
(1) Advantages of heat treatment processing
Heat treatment is a widely applied non-air oxidation tempering and tempering technology which goes hand in hand with controllable atmosphere, and it is also one of the key marks of the current tempering and tempering production technology level.Heat treatment can not only complete the cast iron without air oxidation, no carburizing, and can also complete the production of zero pollution and product workpiece shaozanizing, therefore, it also belongs to the cleaning and high precision production process range.At present, it has become an irreplaceable technology in mold processing.

(2) Heat treatment processing technology product workpiece scale becomes smaller
According to the work experience of various countries in the world, the critical variable of product workpiece heat treatment is only one third of salt bath heat treatment.Scientific research on vacuum furnace heating methods of various raw materials and different complex parts and the variation laws under various refrigeration standards, and computer simulation in many aspects, has the key practical significance for the marketing and promotion of heat treatment processing technology.When vacuum furnace heating, superheated steam or high pressure air cooling and heating treatment, the cyclone uniformity has great harm to the actual hardening effect and quality dispersion of parts.Computer simulation method is used to scientifically study the regularity of the cyclone circulation system in the furnace, which has the key practical significance for improving the furnace structure.

(3) Vacuum furnace heat treatment equipment
The contemporary vacuum furnace heat treatment equipment refers to the cold wall-mounted furnace which can heat the vacuum furnace of components and then heat the furnace in oil or heat the furnace in superheated steam and pressurized steam body.Scientific research, development and design of this type of machine equipment is a comprehensive, innovative and educational work involving many cutting-edge technologies.

The application prospect of heat treatment of mould material is very great.At present, most of the steel of the mold is heated in a vacuum furnace, followed by refrigeration and heat treatment in a steam body.In order to achieve satisfactory physical properties on the surface and inside of the workpiece, vacuum furnace high pressure gas quenching technology must be selected.At the present stage, the international standard air pressure of true gas quenching has been increased from 0.2MPa and 0.5MPa to 1-2MPa and even 3MPa. Therefore, the significant increase in the cooling air pressure of high pressure gas quenching vacuum sintering furnace is a key development trend.

Editing by Frank Lee
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