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Vacuum Heat Treatment Furnace

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Friction ring vacuum heat treatment

The friction ring is a key part on the rock drill. Rock drilling tools are widely used in various stone works such as mines, railways, water conservancy and national defense. In use, the main parts and key parts of these products are required to have high wear resistance, good impact resistance (mainly multiple impact resistance), Good fatigue resistance.

Material of friction ring

The friction ring generally adopts a combination of hardened steel and hardened steel. It is made of 5Cr2NiMoVSi steel, a new type of hot work die. 5Cr2NiMoVSi steel is steel for forging die for large-section presses. It is tempered after hardening to HRC≥60. It has high strength and is suitable for high-speed operation and friction ring transmission requiring compact structure. , can be used in oil pool or dry state.

When quenching high-temperature steel parts, in order to prevent oxidation and decarburization, the traditional process is to use a barium chloride high-temperature salt bath furnace with good deoxidation for heating. This heating method has many problems:

(1) The working environment of heat treatment is harsh, and the gas generated during heating is harmful to the operator’s body and pollutes the environment.

(2) For some parts with complex structure, such as ferrules with oil grooves and oil holes, the residual salt left in the salt bath after heating is difficult to remove in the subsequent processing, and it is easy to produce rust and corrosion pitting.

In recent years, vacuum heat treatment technology has developed rapidly. With the rapid development of science and technology and aerospace, aviation, and weapon industries, the requirements for metal materials are getting higher and higher. Vacuum heat treatment can make metal materials obtain good results that other heat treatments cannot. The vacuum pressurized gas quenching furnace can perform related heat treatment on friction rings, etc., and has the following advantages:

(1) Non-polluting, automatic control, the operator’s labor environment improvement intensity is greatly reduced.

(2) The workpiece has no oxidation and no decarburization in vacuum heating, and can achieve bright heat treatment, which can degrease and degas the parts and avoid surface pollution.

(3) It can realize controlled heating and cooling, and improve the heat treatment quality of parts.

Process flow

The friction ring is quenched in a double-chamber vacuum quenching furnace with a vacuum degree of 6.7Pa; when quenching in oil, a certain pressure of high-purity nitrogen (66500 Pa) is charged into the cold chamber to improve the cooling capacity of the vacuum quenching oil. The size of the effective heating zone of the furnace is 900mm×600mm×600mm, and the vacuum heat treatment process is shown in the figure:

At present, several batches of key parts of rock drills made of 5Cr2NiMoVSi steel have been processed through this process. Although the sizes and shapes are different, the distortion and hardness after vacuum heat treatment meet the customer’s technical requirements, and there is no distortion out of tolerance and cracking. Phenomenon. In the practice of heat treatment production, for parts with complex shapes and large wall thickness differences and high alloy steel workpieces, reasonable pretreatment and furnace charging methods and heat treatment process methods should be adopted to control distortion, improve qualification rate, reduce production costs, and improve production. efficiency.

Selection of vacuum heat treatment equipment:The VOGQ series vacuum heat treatment furnace produced by SIMUWU is a high-quality product for the vacuum heat treatment process of tooling, mold and bearing. Good temperature control accuracy and temperature control uniformity ensure the effective progress of the vacuum heat treatment process. SIMUWU specializes in the manufacture of vacuum furnaces, has more than ten years of relevant experience, and has a good reputation in the field of vacuum furnace manufacturing. The product line includes vacuum air quenching furnace, vacuum oil quenching furnace, vacuum brazing furnace, etc., which are widely sold in developed and developing countries.