Deflection controllable and crack tip passivation expansion radius compensation mechanism

Abstract

The invention provides a deflection controllable and crack tip passivation expansion radius compensation mechanism, and relates to the technical field of precision forming. The compensation mechanismcomprises a rod body unit and a ball head unit, wherein the rod body unit is formed by connecting a first rod body and a second rod body; and the ball head unit comprises a universal rotatable ball head, a ball head push rod and a spring. The compensation mechanism comprises a protruding part, the end of the protruding part is formed by integrating a hemisphere and a circular barrel, and universalrotatable ball fulcrums are arranged at the joint of the hemisphere and the circular barrel. According to the compensation mechanism, the problem that the deflection of the blanking end of a pipe cannot be effectively regulated and controlled due to the fact that the applied loading force often occurs in the whole dynamic separation process of a metal pipe is solved, and the problem that the microcosmic representation mode is that the change of the crack tip passivation radius is uncontrollable, and before a crack is expanded to the inner wall of a pipe material, the crack tip critical passivation radius is reached in advance, so that instability and instantaneous interruption are caused is solved.

Description

technical field [0001] The invention relates to the technical field of precision molding, in particular to a compensation mechanism with controllable deflection and crack tip passivation expansion radius. Background technique [0002] Low-stress blanking is to apply crack technology to pipe (or bar) blanking. First, a circumferential crack is artificially prefabricated on the surface of the pipe (or bar), and then the pipe with a circumferential surface crack ( or bar) to apply a certain external force to make it dynamically separate in the form of low stress brittle fracture. Low-stress bending fracture blanking is recognized as the most promising precision blanking method in the future. It makes full use of the notch effect and bending effect of the circumferential V-shaped groove to achieve brittle fracture of materials at low stress levels and obtain geometry-free Distortion, vertical flat fracture, blank without chamfering. At present, scholars have conducted some res...

AI Technical Summary

Problems solved by technology

Under the combined action of the loading force and the compensation feedback force, the passivation radius of the crack tip can be controlled to change between the minimum passivation radius and the critical passivation radius with the feeding force during the entire crack propagation process, which solves the problem of metal pipe material During the whole process of material dynamic separation, there is often the problem that the applied load cannot effectively control the deflection of the lower material end of the pipe. The microcosmic manifestation is that the change of the passivation radius of the crack tip is uncontrollable. Instantaneous interruption due to sharp critical passivation radius

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