Plastifying fine blanking formation technology design method based on crack initiation control

Abstract

The invention discloses a plastifying fine blanking formation technology design method based on crack initiation control. The method comprises the following steps that according to the fracture criterion of fine blanked materials, critical hydrostatic stress during crack initiation of plates is obtained; in the fine blanking process, edge pressing force, blanking force and counter ejection force are exerted on an edge pressing ring, a male die and a counter ejection plate, and the counter ejection force is increased along with increase of the blanking stroke; when the blanking stroke initial position 0 travels to the blanking stroke position S1, the edge pressing force is increased gradually, when the blanking stroke position S1 travels to the blanking stroke, in the finishing process, theedge pressing force is reduced gradually, and when the blanking stroke reaches the stroke position S1, the plates reach the critical hydrostatic stress. According to the method, the effect of restraining crack initiation is restrained, fine blanked parts with full euphotic belts are obtained, thus energy consumption in the fine blanking process is reduced, the forming quality of the parts is improved, the service life of the die is prolonged, and the good comprehensive economic benefits are obtained.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a plasticized fine-blanking process design method based on crack initiation control. Background technique [0002] Fine blanking is the abbreviation of fine blanking. In a narrow sense, fine blanking refers to strong edge blanking, which is a stamping separation process developed from ordinary blanking. The fine blanking process utilizes the blank holder ring with gear ring and the reverse top plate, a very small blanking gap (the gap on one side is generally set to about 0.5% of the plate thickness) and a fine blanking press that can provide three-way power to achieve high quality. of blanking. The cross-section of fine blanking parts is smooth, vertical, good flatness and high precision. The parts produced can usually be put into use without reprocessing, greatly improving processing efficiency and greatly reducing production costs. Fine blanking technology has ...

AI Technical Summary

Problems solved by technology

When setting the blank holder force and blanking force, the different force requirements of the material at different stages of blanking are usually ignored, which will cause the actual set force to be greater than or less than the force required for the material to complete the fine blanking, and in consideration of the guarantee Under the premise of punching quality, this force is usually greater than the force required by the material to complete punching, which will cause waste of energy, and at the same time setting too much force will cause increased wear of the mold

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