Hydraulic punching method and device capable of keeping wall flatness of workpiece

Abstract

The invention relates to a hydraulic punching method and a hydraulic punching device capable of keeping wall flatness of a workpiece. The hydraulic punching device is arranged in a stepped cavity of an upper die body, wherein the stepped cavity comprises a first sub-cavity, a second sub-cavity, a third sub-cavity and a fourth sub-cavity, and the upper die body and a lower die body are matched to form a cavity for clamping the workpiece; the hydraulic punching device comprises a punching head body which is arranged in the first sub-cavity and the second sub-cavity, a transverse elastic sliding component which is arranged in the third sub-cavity and a piston ejector rod component which is arranged in the fourth sub-cavity and the punching head bodies in a penetrating way; the piston ejector rod component is elastically restrained and positioned by the transverse elastic sliding component; the punching head body moves upwards when the workpiece raises upwards under the effect of internal hydraulic pressure of the punching head body; the piston ejector rod component pushes the punching head body to move downwards to remove a raised part and form a punched hole when a piston is subjected to downward driving force. The hydraulic punching method and the hydraulic punching device capable of keeping the wall flatness of the workpiece have the advantages that since a punching rod is enabled to firstly move upwards and then move downwards to realize punching by using one punching stroke, a hole mouth is prevented from being collapsed, the flatness and the precision of the wall of a pipe are kept, and the hydraulic punching efficiency is improved.

Description

technical field [0001] The invention relates to a workpiece hydroforming method and device, in particular to a hydraulic punching method and device for workpiece hydroforming. Background technique [0002] In the fields of aircraft, spacecraft and automobiles, reducing weight to save materials and energy during operation is one of the trends in the development of modern manufacturing technology. Hydroforming is developed under this background as an advanced manufacturing technology for manufacturing hollow lightweight structural parts. This technology can not only improve the strength and rigidity of formed parts, but also save materials and reduce costs. The basic process of this technology is as follows Figure 1a and 1b Shown: as Figure 1a As shown, the pipe 3 is first placed in the lower die 2, then the upper die 1 is closed, the two ends of the pipe 3 are sealed with horizontal punches 4, 4, and the pipe 3 is filled with liquid; then, as Figure 1b As shown, in the p...

AI Technical Summary

Problems solved by technology

[0004] However, this existing hydraulic punching process has disadvantages: hydraulic punching generally adopts the punching method from the outside to the inside, and uses high-pressure liquid as the support of the die. If the collapse is to be effectively prevented, the internal pressure P must be sufficiently high

Which does not reveal how to improve the quality of the forming hole technical means

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