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Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Practical Technology For Low Pressure Vacuum Carburizing Heat Treatment

The widespread application of vacuum heat treatment technology not only improves the performance of parts and products, but also promotes the rapid progress of its own process level and processing equipment. The current related key technologies continue to break through, the process is increasingly perfected, the production process is automated, The continuous improvement of intelligence and digitalization has promoted the vigorous development of related technologies and new products.

With the continuous advancement of related technologies, not only vacuum heat treatment equipment has made great progress, but its related supporting facilities have also made great progress.

Advantages of vacuum heat treatment technology

Vacuum heat treatment technology has been well applied in vacuum heat treatment and vacuum chemical heat treatment of important parts such as tool and die steel, stainless steel, bearing steel, carbon steel, cemented carbide, alloy steel and high alloy steel, because vacuum infiltration Carbon has many advantages:

1.Bright quenching can be achieved

In a low-pressure (pressure generally ≤30mbar) vacuum state, the carburizing method consists of several sub-carburizing procedures, including multiple sub-strong carburizing (introducing the carburizing medium acetylene) and sub-diffusion (injecting protective gas, such as nitrogen or inert gas) gas), so this process is also called pulse carburizing process. This carburizing method can ensure that there will be no over-carburization at the corners of the workpiece, and it can also ensure that carbon will not accumulate on the surface of the workpiece to form carbon black. Thus achieving the purpose of bright quenching.

In addition, it is also widely used in precision small and micro bearings (bearing inner diameter <9mm). The quality of bearing rings made of stainless steel, bearing steel and other materials after vacuum quenching is very good, because the surface of the ring after vacuum quenching has no Decarburization and carburization phenomena, the material of the ferrule can be degassed, and its impurities can be reduced to less than 1.5ppm, so that the hardness is evenly distributed and the distortion is minimal, thereby improving the wear resistance of the bearing and having a high elastic limit. and contact fatigue strength, extending the service life of the bearing and improving market competitiveness.

2.Has degassing effect

When the degree of vacuum is lower than the corresponding decomposition pressure of the metal or alloy, its oxides will decompose, forming free oxygen and immediately being discharged outside the vacuum chamber, thereby improving the quality of the internal workpiece.

Since the blanks of steel parts will inhale a very small amount of hydrogen, nitrogen, carbon monoxide and other gases in the atmosphere during smelting, tiny pores will be produced, which can easily cause defects such as hydrogen embrittlement and cemented carbide. Air will also enter during pressing, so for tool and die steel, the residual gas inside the workpiece can be removed through vacuum technology to purify the structure. For cemented carbide, the residual gas inside the workpiece can also be removed through vacuum treatment.

Vacuum furnaces are commonly used in small and medium-sized enterprises and professional tool and mold factories. The rate of using vacuum furnaces for quenching workpieces such as cutting tools, molds and power tools is also gradually increasing.

3.Can reduce the machining allowance after vacuum heat treatment

Because there is no oxidation and decarburization, vacuum heat treatment has very little distortion and is clean and bright, so it is widely used for vacuum quenching and vacuum carburizing of oil pump nozzle parts. This can avoid the use of salt bath furnaces that sometimes cause the inner holes of parts to be cleaned due to residual salt. Dirty cleanliness or the use of a protective atmosphere will cause black tissue (decarburization) to appear on the surface.

4.Cleaning process

Vacuum heat treatment is a clean heat treatment process. It plays an important role in the entire heat treatment process. It can improve product quality, change the appearance of the heat treatment workshop, and improve the operating environment. It is a technology worthy of promotion and application.

SIMUWU company provides high-quality vacuum carburizing furnaces and vacuum furnace equipment, which are especially suitable for the automotive field that has high productivity requirements. The production repeatability is very good; the computer monitoring system is used to achieve precise quality control. Environmentally friendly and safe low-pressure vacuum carburizing furnace uses vacuum technology, no carbon black, no fire curtain door, no smoke, no oil vapor, no risk of fire. The low-pressure vacuum carburizing furnace is a cold and clean equipment.