Concave die base plate for drop hammer die and application method

Abstract

The invention discloses a concave die base plate for a drop hammer die and a machining process. The concave die base plate is arranged between a convex die and a concave die and is used for machininga fairing with large forming depth. A concave portion allowing the convex die to be embedded is arranged on the concave die. The guide fillet radius of the upper edge of the concave portion is r. A plate body is included. The plate body and the upper surface of the concave die are attached in a matched manner. An opening is formed in the position, corresponding to the concave portion of the concave die, of the plate body. The shape of the opening is consistent with that of the upper edge of the concave portion, and the size of the opening is larger than that of the upper edge of the concave die by 1 mm to 2 mm. The guide fillet radius of the upper edge of the opening is R, and the fillet radius R is larger than r. Limiting blocks for locating the plate body on the concave die are arrangedon one side of the plate body. According to the concave die base plate, the forming fillet R can be enlarged to the needed process parameter size according to the part forming process, and when a material enters a concave die cavity, the pulling stress in the forming process is reduced; material feeding is easy; pull cracks are not prone to happening to parts; and the percent of pass is greatly increased.

Description

technical field [0001] The invention relates to a die backing plate, in particular to a die backing plate for a drop hammer die. Background technique [0002] The fairing is a common part in the field of aviation and aerospace, and it is generally formed by a drop hammer die. Some fairings have a deep forming depth and a small r fillet at the root of the flange. When forming with a drop hammer die, the material is difficult to feed, and it is not easy to enter the cavity of the concave mold, causing the parts to crack and the pass rate is very low. Contents of the invention [0003] The object of the present invention is to provide a die backing plate for a drop hammer die with a high pass rate and an application method that solves the above-mentioned problems. [0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows: a die backing plate for a drop hammer die is arranged between the punch and the die, and is used...

AI Technical Summary

Problems solved by technology

Some fairings have a deep forming depth and a small r fillet at the root of the flange. When forming with a drop hammer die, the material is difficult to feed, and it is not easy to enter the cavity of the concave mold, causing the parts to crack and the pass rate is very low.

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