A Compensation Mechanism with Controllable Deflection and Expansion Radius of Crack Tip Passivation

Abstract

The present application provides a compensation mechanism with controllable deflection and crack tip blunt expansion radius, which relates to the technical field of precision molding. The compensation mechanism includes a rod unit and a ball head unit. The rod unit consists of a first rod and a second Two rods are connected; the ball head unit includes a universal rotatable ball head, a ball head push rod and a spring; the compensation mechanism includes a protrusion, and the end of the protrusion is a hemispherical and circular cylinder The body is integrated, and the connection between the hemispherical and circular cylinder is equipped with a universal rotatable ball fulcrum, which solves the problem that the applied load cannot effectively control the deflection of the pipe material end during the dynamic separation process of the metal pipe material. The microscopic manifestation of the problem is that the change of the passivation radius of the crack tip is uncontrollable. Before the crack propagates to the inner wall of the pipe material, the problem of instability and instantaneous failure occurs due to reaching the critical passivation radius of the crack tip in advance.

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 expanding 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...

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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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