Semi-blind hole forge piece hole-shrinking forging method

Abstract

The invention provides a semi-blind hole forge piece hole-shrinking forging method. According to the semi-blind hole forge piece forging method, a traditional tool is used for achieving the forge piece hole-shrinking process by changing the deformation process of a material and controlling deformation. The method mainly comprises the following steps of (1) flattening the tail of an ingot and cutting a dead head flat; (2) conducting upsetting; (3) punching a hole with a solid punch pin; (4) broadening the hole through a mandrel until the big-diameter end of a traditional common core rod can penetrate into a blank to be drawn out; (5) drawing out the traditional common core rod to form a preformed blank; (6) erecting the blank to conduct upsetting and smoothening the end faces of the blank;(7) conducting hole-shrinking forming; and (8) conducting surface finishing. Through the method, raw materials are saved; the cost of the raw materials is lowered; the machining allowance is reduced;the machining time is shortened; the production efficiency is improved; consumption during the production process is reduced; the internal metal structure and metal flow line at the intersection of steps of an inner hole of a forge piece are improved, and a continuous metal fibrous structure of the forge piece is maintained after machining; the anti-fatigue performance of the forge piece is improved, and the service life of the forge piece is prolonged.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and relates to a hole-receiving forging method of a semi-blind hole forging. Background technique [0002] With the development of science and technology, users have higher and higher requirements for product quality and performance, and the product structure should also adopt an integral structure as much as possible. Semi-blind hole parts are processed and manufactured as a whole. Since both ends of the product are semi-blind holes, there is a large gap between the end diameter of the inner hole and the middle part of the product. The shape and structure are special, and the traditional forging method cannot be directly forged. [0003] The forging method usually adopted for such semi-blind hole products: 1) Increase the wall thickness of the forging, forging it into a common hollow forging, and then forming it by machining. During forging, the diameter of the inner hole needs to...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the above method: Method 1) The wall thickness of the forging is increased, the raw materials are wasted, and the forging design is often too heavy due to the large gap between the product apertures, and the size of the mandrel used in the forging process is caused by the small end aperture. Too small to bear too much weight, increasing the difficulty of forging, and there are safety hazards in the production process

Method 2) Forging of solid forgings is easy to achieve, but the internal quality of the product is not easy to guarantee, and it is difficult to machine holes, resulting in serious waste of raw materials, long processing time, and excessive machining allowance

In addition, the forgings produced by the above two methods will destroy the metal fibers of the forgings when machining the semi-blind hole end, which will adversely affect the performance of the product

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