Shaft machining vacuum heat treatment

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Shaft parts act as springs for supporting and rotating parts that transmit power or motion on pre-production equipment. Vacuum heat treatment is an important step in the processing of shaft parts. This article briefly introduces the knowledge of vacuum heat treatment of shaft processing.

Shaft parts are responsible for supporting transmission parts, bearing loads and transmitting torque in machine tools. They need to have high fatigue resistance and wear resistance. After vacuum heat treatment, it has good comprehensive properties (strength and toughness, good plasticity), high fatigue strength and high wear resistance. And vacuum heat treatment is an important operation in the manufacturing process of mechanical parts and tools, and the vacuum heat treatment process can improve the performance of heavy shaft parts.

Two methods of vacuum annealing and vacuum tempering are more common in vacuum heat treatment. Depending on the treatment used, the material may become more or less brittle, hard or soft or stronger or weaker. The method chosen depends on the desired material properties. For example: To process a steel material, the designer may need a final material with high tensile strength but a relatively low degree of brittleness.

Shaft parts machining process

A shaft is a mechanical part that transmits motion, torque or bending moment, a shaft with an aspect ratio of less than 5 is called a short shaft, and a shaft with a diameter greater than 20 is called an elongated shaft, with most of them in between. The product structure of the shaft is different. The shaft can be divided into stepped shaft, tapered mandrel, optical shaft, hollow shaft, crankshaft, camshaft, eccentric shaft, various screw shafts, etc., which are mainly used to support transmission parts, transmission torque and bearing load. Shaft parts are rotating parts whose length is greater than their diameter, usually consisting of an outer cylindrical surface, a conical surface, an inner hole and a concentric shaft and threads on the corresponding end faces. According to different structural shapes, shaft parts can be divided into optical shafts, stepped shafts, hollow shafts and crankshafts.

Shaft machining vacuum heat treatment

The shaft is less rigid during machining. If the cutting operation is affected by factors such as cutting force, gravity, cutting heat, etc., the shaft will be bent and deformed, resulting in vibration, taper, drum and bamboo defects, and it is difficult to ensure the machining accuracy. It is necessary to analyze the influence of various key technical problems of slender shaft processing on the slender shaft processing, so as to ensure the accuracy of shaft processing and ensure the pass rate.

Here, take the processing of the transmission shaft as an example to understand the basic process of the processing technology of the transmission shaft: analysis of the shaft parts drawing → checking the blanks → confirming the method of the main processing surface → determining the positioning datum of the shaft parts → dividing its stages → arrangement of the vacuum heat treatment process → processing The size and cutting amount of the part → formulate the program → proofread the processing flow of the transmission shaft.

Usually, in the process of vacuum heat treatment, it is slowly heated to a predetermined temperature and then cooled. The cooling rate determines the final structure of the part and therefore the mechanical properties associated with it. The final structure will be independent of the heating rate, as long as the heating rate is slow enough, the machined part can reach structural equilibrium at the highest temperature.

In practice, the subsequent cooling rate that determines the final structural properties may vary between vigorous water quenching and slow cooling in the furnace.

This paper briefly introduces the vacuum heat treatment of shaft machining. Through the article, we can understand the machining process of shaft parts. Among them, vacuum heat treatment operation is a technical requirement in the design process. Vacuum heat treatment is to heat the processed shaft workpiece in a certain vacuum environment to A type of process that changes the structure of the material to control its properties by maintaining it at a specific temperature for a certain period of time, and then cooling it at different speeds and in different media.

The RVA high temperature vacuum annealing furnace produced by SIMUWU is a high-quality product for this kind of process. Good temperature control accuracy and temperature control uniformity ensure the effective progress of the vacuum heat treatment process. With more than ten years of sales and manufacturing experience, it is exported to developed regions in Europe, America and Asia. It is a widely acclaimed vacuum furnace product.