Oval hole punching die for CNC punching machine and ellipse hole punching method

Abstract

The invention discloses an elliptical hole punching die for a numerical control press. The elliptical hole punching die comprises multiple lower dies and punches used in cooperation with the lower dies. Each lower die is provided with a punching hole comprising arc sections. When the arc sections of the multiple lower dies are jointed, edge line of an elliptical hole is formed. The elliptical hole punching die enables a large elliptical hole to be punched in a sectioned mode, and finally the complete elliptical hole can be formed. Due to the fact that the complete elliptical hole can be formed right after the arc sections of the multiple lower dies are jointed, the elliptical hole punched through the elliptical hole punching die do not have lapping defects, the edge line of the elliptical hole is smooth, and production in subsequent processes is benefited; meanwhile, the elliptical hole punching die can also effectively reduce punching times and improve the punching efficiency of the elliptical hole. The invention further provides an elliptical hole punching method by the adoption of the elliptical hole punching die for the numerical control press.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, and more specifically relates to an elliptical hole punching die for a numerically controlled punching machine and a punching method for an elliptical hole. Background technique [0002] The production process of various products involves the processing of elliptical holes on sheet metal parts, and when the size of the elliptical holes is large, limited by the size of the CNC punching station, the elliptical holes can only be processed by CNC punching. The nibble punching process can be carried out through the small round hole die. The so-called nibble punching process is to carry out multi-knife punching on the sheet metal through the small round hole die. The joint line after multi-knife punching forms the edge of the elliptical hole. The curvature of the arcs at both ends of the shaft is relatively large, while the curvature of the arcs at both ends of the short axis is relativel...

AI Technical Summary

Problems solved by technology

[0003] Although nibble punching can be used to complete the processing of elliptical holes, there are major disadvantages in this processing method, mainly in the following: the processing process is cumbersome, and the number of repeated processing is large. Usually, two molds for processing one elliptical hole It is estimated that 52 times of encroaching blanking are required; in addition, the edge of the oval hole formed after encroaching blanking has many seams and burrs on the edge, which is not conducive to the subsequent utilization of sheet metal parts; There are more waste materials, which can easily lead to stamping of sheet metal parts, and even lead to the scrapping of sheet metal parts

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