Low-stress discharging die and method in pure rolling contact with bar

Abstract

The invention relates to a low-stress discharging die and method in pure rolling contact with a bar, and belongs to the technical field of low-stress precise discharging. According to the low-stress discharging die and method in pure rolling contact with the bar, structural optimization design is carried out on the basis of an existing discharging die, an autorotation anti-attrition hammer head isarranged in an existing hammer head sliding block, so that sliding friction contact between the surface of the bar and the discharging die is converted into pure rolling contact, friction abrasion between the bar and the discharging die is greatly reduced or even eliminated, the use performance of a discharging machine is remarkably improved, the service life of the discharging machine is remarkably prolonged, and meanwhile the surface quality of the bar is greatly improved. The autorotation anti-attrition hammer head comprises an inner hammer head body in interference fit with an inner ringof a bearing; the inner hammer head body is connected with an inner hammer head motor through a coupler; an inner hammer head motor base of the inner hammer head motor is fixedly installed in an innercavity of the hammer head sliding block; the lower end of the hammer head sliding block is connected with a shaft head through a connecting rod; and a main shaft coincides with the axis of the bar.

Description

technical field [0001] The invention relates to a low-stress blanking mold and a method for pure rolling contact with a bar, and belongs to the technical field of low-stress precision blanking. Background technique [0002] Low-stress blanking is to apply crack technology to bar blanking. First, a circular crack is artificially prefabricated on the surface of the bar, and then a certain external force is applied to the bar with the circular crack to make it brittle with low stress. Broken form dynamic separation. 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 research on low-stress bending blanking technology from the aspects ...

AI Technical Summary

Problems solved by technology

Through a large number of blanking tests in the past, the applicant found that the friction between the bar and the blanking mold 400 caused severe friction on the bar, which was mainly due to the contact between the surface of the bar and the bearing 900 of the blanking mold 400 during the blanking process. Sliding friction has been occurring in the inner ring, which causes greater wear on the contact surface between the bar surface and the inner ring of the bearing 900, and the wear on the bar surface is more serious

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