A high-efficiency and precise low-stress blanking method for radial breaking

Abstract

The invention discloses a radially-severing efficient and precise low-stress discharging method, and belongs to the technical field of intelligent manufacturing. Four sets of discharging units symmetrically distributed in the circumferential direction of bars sequentially apply loads to the bars at intervals. Each set of discharging unit comprises discharging clamps arranged at the ends of a firsthydraulic oil cylinder and a second hydraulic oil cylinder, and thrust hammerheads fixed to the ends of piston rods of a third hydraulic oil cylinder and a fourth hydraulic oil cylinder. The discharging clamps and the thrust hammerheads are oppositely arranged, when the bars are severed, after the thrust hammerheads jack the bars, the discharging clamps apply loads to the two ends of V-shaped grooves of the bars simultaneously, the discharging clamps and the thrust hammerheads in the four sets of discharging units cooperate to generate alternating force at the positions of the V-shaped grooves, under the acting force, cracks are produced at the positions of the V-shaped grooves, it is guaranteed that the cracks circumferentially propagate along the sections of the sharp ends of the V-shaped grooves gradually towards circle centers, and the beneficial effects that the efficiency is high, the fatigue crack propagation region area is large, and the fracture surface quality is high are achieved.

Description

technical field [0001] The invention relates to the technical field of intelligent manufacturing, in particular to a high-efficiency and precise low-stress blanking method for radial breaking. Background technique [0002] Low-stress blanking is to apply crack technology to bar blanking. First, a circumferential V-shaped groove is artificially prefabricated on the surface of the bar, and then a certain external force is applied to the bar with the circumferential V-shaped groove surface. Make it dynamically separate in the form of low stress brittle fracture. It utilizes the notch effect and bending effect of the circumferential V-groove to achieve brittle fracture of materials at low stress levels. At present, scholars have conducted some research on low-stress bending blanking technology from the aspects of stress concentration, mechanism design, and fracture morphology. However, key core technologies such as the material separation mechanism of low-stress bending blanki...

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Problems solved by technology

[0005] The invention provides a high-efficiency and precise low-stress blanking method for radial breaking, which aims to solve the problems of poor cross-section quality and low cross-section flatness caused by the loading method adopted for the bar in the prior art. Wide range, high efficiency, large area of ​​fatigue crack growth area, good section quality, etc.

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