Integral shrinking die with small shrinkage coefficient and high height-to-thickness ratio and its mold

Abstract

The invention relates to a small-necking-coefficient and large-height-thickness-ratio integrated necking female die and a mold comprising same and mainly aims to solve the technical problems that thebottom half section of a blank of an existing necking female die is likely to be unstable and easily causes scrapping of a manufactured part and waste of materials. The small-necking-coefficient and large-height-thickness-ratio integrated necking female die provided by the invention is a hollow cylinder; a lug boss is arranged at the lower part of the necking female die; the lug boss is uniformlyprovided with a plurality of pull rod holes; and the shape of the generatrix of an inner chamber of the necking female die is designed according to the maximum compatible rule and the rule that threepoints form an arc line. The mold comprising the integrated necking female die comprises an upper die plate, a necking female die body, a plurality of pull rods, protective sleeves, a lower die plate,a lower cushion board, nuts and open gaskets; the upper die plate is arranged on the upper end face of the necking female die; each pull rod is arranged inside the corresponding pull rod hole; each protective sleeve is installed on the corresponding pull rod; each nut is installed at the lower end of the corresponding pull rod; each open gasket is installed at a knife returning groove formed in the middle part of the corresponding pull rod; and the lower cushion board is installed on the lower die plate.

Description

technical field [0001] The invention relates to an integral necking die with a small shrinkage coefficient and a large height-thickness ratio and the mold thereof, which belongs to the technical field of plastic forming of light alloys. Background technique [0002] In the existing shrinking process, the busbar of the shrinking die is determined according to the outer wall of the required workpiece. During the overall straight wall shrinking process of the workpiece, the inner wall of the shrinking die is close to the blank. , the press provides downward axial pressure F to the shrinking die 轴 It is the nominal pressure of the press, which is constant, but the inner shape of the die is in contact with the deformation zone of the blank. The more it is compressed downward, the larger the volume that needs to be deformed, and the difficulty of deformation increases, resulting in the transmission to the lower half of the blank. The compressive stress is getting bigger and bigge...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the lower half of the rough blank is easy to be unstable, which is easy to cause scrapping and waste materials existing in the existing shrinking die, and to provide an overall shrinking die with a small shrinking coefficient and a large height-to-thickness ratio. Mouth die and its mold

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