A method for overcoming deep-drawing defects of semi-flat tube parts with large aspect ratio

Abstract

The invention discloses an overcoming method for drawing defects of a large length-width ratio flat tube part. The overcoming method comprises the steps of designing a technological model of part drawing forming according to a theoretical model of the part; optimizing and designing a spreading raw material according to the technological model to ensure that the fiber direction of the plate material of the part keeps parallel to the length direction of the part; manufacturing a primary profile similar to the shape of a flanged side according to the principle that the arc lengths of the theoretical model in the length and width directions are the same before and after shaping; externally extending and protruding central regions of the two ends of the primary profile in the length direction as compensation excess materials; adding friction layers on the upper and lower surfaces of the compensation excess materials at the two ends of the spreading raw material; and finally, putting the spreading raw material on a mold manufactured according to the technological model to be subjected to drawing forming.

Description

technical field [0001] This application relates to the deep-drawing forming technology of sheet metal parts in the field of aircraft manufacturing, specifically a method for overcoming the defects of deep-drawing, especially suitable for overcoming the manufacturing errors of large-length-width-ratio plate semi-flat tube molds and the fit caused by sheet thickness tolerances Forming defects caused by uneven gaps. Background technique [0002] In the field of sheet metal deep drawing, overcoming the defects of deep drawing has always been a major problem in production. Often, cracking and wrinkling defects occur at the same time due to the uneven fit gap of the flange edge pressing area. The applicant's prior patent, application number 2014105644483, discloses a semi-flat tube bulging and deep-drawing forming method and a forming die; the bulging and deep-drawing method by making the sheet material produce a balloon blowing method reduces the stress on the semi-flat tube It ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defects caused by large aspect ratio semi-flat tube molds and sheet material matching accuracy errors that cannot be overcome by the prior art, the purpose of this application is to provide a method for overcoming the deep drawing defects of large aspect ratio semi-flat tube parts, which adopts The technical scheme is as follows:

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