Direct molding process for hot-extruded hollow axle

Abstract

The invention discloses a direct molding process for a hot-extruded hollow axle. The process comprises pipe inspection and processing, gradient heating treatment, mold loading, horizontal and radial loading, integral heating after demolding, mold reloading and reloading, wherein direct variable-diameter hot extrusion forming of the hollow axle is effectively finished after repeating the steps are repeated and the inspection treatment is performed. The direct molding process has the advantages of reasonable process design, simple mold structure, high upsetting speed, high yield, good use effect and low cost, and is particularly suitable for large-scale industrial production of high-speed train axles. The weight of the axle is reduced greatly, and the strength and torque force of the hollow axle are effectively enhanced and ensured.

Description

technical field [0001] The invention relates to a hot-extrusion forming tube material technology, in particular to a forming process for hot-extruding a hollow axle by using a flat forging hydraulic press, and belongs to the field of metal forging processing. Background technique [0002] In recent years, with the development of high-speed railways, the requirements for high-speed trains have been continuously improved. Among them, in order to ensure the running speed of the train and reduce the loss of energy due to friction, reducing the weight of the train has become an inevitable development of high-speed trains. To reduce the unsprung mass and reduce the weight of the axle, the use of hollow axles has become the first choice. [0003] At present, the processing of hollow axles mainly continues the forging process for forging, and then produces hollow axles with constant diameter by machining and drilling. The hollow axles produced consume a lot of raw materials, the pr...

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Problems solved by technology

[0003] At present, the processing of hollow axles mainly continues the forging process for forging, and then produces hollow axles with constant diameter by machining and drilling. The hollow axles produced consume a lot of raw materials, the processing cycle is long, and the production cost remains high. , the production process is greatly restricted, and the use effect of the hollow axle cannot be fully utilized

Directly using hollow tube blanks to forge axles obviously has the advantages of saving raw materials, shortening the process flow and processing cycle. However, due to the limitation of heat-extruded hollow axle variable-diameter forming technology, the processing quality has not been guaranteed, especially the horizontal and transverse forging of axles. It belongs to the three-dimensional forming problem. The deformation part has the characteristics of instantaneous locality and continuity, and the calculation amount is huge. So far, no related reports have appeared.

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