Method for reducing earing ratio of deep-drawn part

Abstract

The invention relates to the technical field of stamping of deep-drawn parts, and discloses a method for reducing the earing ratio of a deep-drawn part. Sections in different dimensions are configuredin different directions of a blank holder; and specifically, the sections in larger dimensions are configured in the low-earing-height direction or the low-plastic-strain-ratio direction of the deep-drawn part, and the sections in smaller dimensions are configured in the high-earing-height direction or the high-plastic-strain-ratio direction of the deep-drawn part. Sections with similar shapes and different sizes are configured in different directions of the blank holder, a blank greatly deforms in the blank pressing process in the small-deformation direction in the deep drawing process, theblank can slightly deform in the blank pressing process in the large-deformation direction, and therefore the deformation of the blank tends to be uniform in all directions in the whole deep drawing process, and the earing ratio is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of stamping of deep-drawn parts, in particular to a method for reducing the lug rate of deep-drawn parts. Background technique [0002] In the sheet metal production process, due to the influence of various external factors, the internal grains are concentrated in one or several directions, resulting in anisotropy, resulting in uneven earing in the edge area of ​​​​the drawn part. [0003] The ear-making defects produced by deep-drawn products not only increase the trimming process of the workpiece, resulting in material waste, but also cause the cup wall (especially the upper part) to have uneven thickness along the circumference, making it difficult to remove the cup during the deep-drawing return stroke, reducing the Production efficiency, and often affect the performance of the finished product, can also lead to cracking of the cup wall in severe cases. [0004] In order to effectively reduce the deep-d...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the defects of the prior art. When drawing straight-walled parts with curved surface blank holders, certain plastic deformation will occur in the blank during the blank blanking process, and the shape of the curved surface blank holders is very important for the drawn parts. The dimensional accuracy is very small, and it provides a method that can make the drawn parts produce the opposite type of lugs to facilitate the reduction of the lug rate in the subsequent deep drawing.

Images