PRODUCT CATEGORIES

Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Advantages and applications of vacuum heat treatment technology

Vacuum annealing

Due to the degassing, degreasing and rust removal effects during vacuum heating, the gas dissolved in the metal is easily discharged, so the surface of the parts after vacuum annealing is clean and bright. During vacuum annealing, the deformed grains produced by pressure processing are restored, and new grains are formed at the same time, so that the structure is uniformly refined, thereby changing the mechanical properties of the material. After vacuum annealing, there is no trace of lubricant on the surface of the material, and the surface is dry. It can be directly electroplated without the cleaning process of pickling or sandblasting, so as to achieve the purpose of shortening the process flow and improving product quality.

The picture above is a vacuum annealing furnace

Vacuum hardening

The main purpose of vacuum quenching is to improve and strengthen the quality of metal components, especially the quality of the surface layer. For tool steel, vacuum quenching can ensure sufficient hardness requirements, and the surface brightness is good, the deformation is small, the hardness is high and uniform, the service life is long, the post-processing process is simple, and the production cycle is short. After vacuum quenching, the surface of steel is bright because there is no oxide film on the supply surface, and the oil impurities attached to the supply surface are volatilized, so that the surface of the metal parts is shiny. Vacuum quenching is slow and uniform. After air-cooled quenching, the workpiece does not need to be moved to cool in place, so the deformation is small and regular. There is no oxidation or decarburization after vacuum quenching. Due to the high quenching heating temperature, the highly active surface of high-alloy tool steel will be instantly carburized during oil quenching after vacuum heating, forming a small carburized layer. Therefore, the hardness after vacuum quenching is higher and more uniform than that during ordinary quenching, and there will be no quenching soft spots. The degassing effect during vacuum heating can improve the strength, wear resistance, anti-seizure performance and fatigue strength of the material, so the life of the workpiece after vacuum quenching is generally higher. It is reported that the average life of the mold can be increased by more than 30% after vacuum quenching, and some can be increased to 4 times.

Vacuum gas quenching

Vacuum gas quenching is a process in which the workpiece to be processed is heated under vacuum state, and then rapidly cooled in high-pressure, high-flow cooling gas to improve the surface hardness of the workpiece to be processed. Compared with ordinary gas quenching, oil quenching and salt bath quenching, vacuum gas quenching has obvious advantages: ① good surface quality of workpiece, no oxidation, no carbon increase; ② good quenching uniformity and small deformation of workpiece; ③ good controllability of quenching strength and controllable cooling rate; ④ high productivity, eliminating the need for cleaning after quenching; ⑤ no environmental pollution.

The picture above is a vacuum gas quenching furnace

Vacuum carburizing

The vacuum carburizing depth and surface concentration can be controlled; vacuum carburizing can change the metallurgical properties of the surface of metal parts; the effective carburizing depth of vacuum carburizing is deeper than the actual carburizing depth of other methods.

Vacuum tempering

The purpose of vacuum tempering is to maintain the advantages of vacuum quenching (products are not oxidized, decarburized, smooth surface, no corrosion pollution, etc.). If vacuum tempering is not used, the superiority of vacuum quenching will be lost. This is especially true for precision tools that are not finished after heat treatment and require multiple high-temperature tempering. The application of vacuum tempering is closely linked to vacuum quenching. All mechanical parts after vacuum quenching must undergo vacuum tempering in order to reduce or eliminate quenching stress, ensure corresponding organizational transformation, improve the plasticity and toughness of the material, obtain hardness and strength, stabilize the size of the workpiece and other process requirements.