A punching method and punch structure for aluminum alloy forgings

Abstract

The invention relates to a punching method and punch structure used for an aluminum alloy forged piece. According to the punching method, the draft angle of a first punch and the draft angle of a second punch are designed to be within the range from two degrees to three degrees, meanwhile, the small-head end of the first punch is chamfered from R15 to R30, therefore when the forged piece is subjected to large deformation, the metal flow resistance can be reduced through a large fillet, so that workblank is prevented from adhering to the punch, in addition, the large-head end of the first punch is chamfered from R2 to R5, and the metal flow deformation is reduced, so that it is guaranteed that the metal flow does not cause damage to an inner hole. In addition, the diameter of the large-head end of the second punch is from 20 mm to 30 mm larger than the diameter of the large-head end of the first punch, and the large-head end and the small-head end of the second punch are not chamfered, so that it is effectively guaranteed that in the punching process, the inner hole of the blank is smooth and free of edge collapse, thereby the quality of the inner hole obtained after the punching is guaranteed, neither bark pocket nor punching steps happen to the inner hole, after the punching, the blank can be directly subjected to remelting still at a high temperature, the production efficiency is raised, the production cycle is shortened, and the mechanical properties of the forged piece are improved.

Description

technical field [0001] The invention relates to the field of forging, in particular to a punching method and punch structure for aluminum alloy forgings. Background technique [0002] With the rapid development of my country's aerospace industry, modern defense industry and transportation industry, the use and demand of aluminum alloy forgings are gradually increasing. In the process of aluminum alloy forging and punching, due to the large friction coefficient between the aluminum alloy and the steel mold, the fluidity during deformation is poor, and the adhesion is large. When a strong large deformation is performed, the blank tends to stick to the punch On the other hand, because the punching process is a strong large deformation process, due to the characteristics of the aluminum alloy itself, it is more likely that the aluminum alloy will have a large number of skins during the punching process. If the hole steps are not cleaned in time, it will lead to the subsequent r...

AI Technical Summary

Problems solved by technology

In the aluminum alloy forging and punching process, due to the large friction coefficient between the aluminum alloy and the steel mold, the fluidity is poor during deformation, and the adhesion is high. When a strong large deformation is performed, the blank will often stick to the punch. On the one hand, it is easy to cause defects such as peeling and warping of forgings. On the other hand, because the punching process is a strong large deformation process, due to the characteristics of the aluminum alloy itself, it is easier for the aluminum alloy to appear a large number of skins during the punching process. If the hole steps are not cleaned in time, it will lead to the expansion of the subsequent horse frame, and the workpiece will be broken when the ring is rolled, which will easily lead to the scrapping of the finished product. At the same time, the use of the existing aluminum alloy forging punching method will increase the number of forging fires and prolong the production cycle. , Increase production costs, increase the number of forging fires, and at the same time cause coarse grains of aluminum alloy and reduce the mechanical properties of finished forgings

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