Backward extrusion forming method of stepped hollow shaft part and die

Abstract

The invention discloses a backward extrusion forming method of a stepped hollow shaft part and a die. The backward extrusion forming method comprises the following steps: adopting a cylindrical bar material for blanking; heating to 750 DEG C through an intermediate-frequency diathermanous stove, and then forming a formed inner cavity through backward extrusion through an extrusion forming shape; carrying out little machining on an extrusion piece; then carrying out surface shot blasting treatment, thus obtaining a qualified forging piece. According to the backward extrusion forming method disclosed by the invention, a one-die two-process way is adopted by the die, so that the forming speed is quickened, an extrusion force of a punch is well shared, and meanwhile, the production rhythm is greatly increased; during a forming process of the two-process die, the in-die time of blank is reduced, the contact time of the die and the blank is reduced, and the service life of the die is greatly ensured; the problems of forming complexity, material waste, low efficiency and poor quality of the stepped hollow shaft part are solved.

Description

technical field [0001] The invention relates to the field of mechanical processing with less cutting allowance and metal warm extrusion, in particular to a reverse extrusion forming method and mold for stepped hollow shaft parts. Background technique [0002] There are two main types of forming methods for stepped hollow shafts: the first one is the traditional processing method. The bar is directly processed by mechanical cutting to obtain the product. This method has many processing steps, long processing time and high efficiency. If it is too low, it is not conducive to mass production; in the process of processing, a large amount of material will inevitably be wasted due to cutting, resulting in a sharp increase in material cost, which does not meet the requirements of energy-saving production. [0003] The second method is the more common step hollow shaft processing method, that is, it is directly formed by hot extrusion through a composite mold. The characteristic of...

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Problems solved by technology

Due to the inaccurate positioning of the product during forging, the scrap rate is high; the inner hole is not easy to form, or the forming is not in place, and the material utilization rate is not the best; the cost of the mold is expensive, the forging takes a long time in the mold, and the mold life is low

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