A deep-drawing method for step-shaped corner-wrapped parts in the aircraft door area

Abstract

The invention provides an aircraft gate area step-like wrap angle part drawing and forming method. The aircraft gate area step-like wrap angle part drawing and forming method constructs a working process piece with holes formed in the bottom according to a special symmetrical structure of a step-like wrap angle, and a large hole is formed in a crease-resistance expanded blank, a theoretical expanded blank is calculated through general simulation software, and a forming die is used for completing workpiece forming. The aircraft gate area step-like wrap angle part drawing and forming method is simple in a crease-resistance allowance taking-producing method and can better ensure the material thickness of parts after forming within an allowable range of tolerance. The defect that a dangerous cross section is prone to being cracked when a pot-shaped complex part is subjected to drawing and forming is solved, and the drawing limit of parts is raised. The aircraft gate area step-like wrap angle part drawing and forming method is high in universality, and can refer to the forming of different door wrap angle structural parts of aircrafts, and product quality is stable and dependence on thetechnical level of operators is low.

Description

technical field [0001] The invention relates to a forming technology of sheet metal parts in the field of aircraft manufacturing, in particular to a forming method and forming mold for parts with variable curvature and stepped door areas with exposed corners, especially suitable for parts made of thin materials and stainless steel plates deep drawing. Background technique [0002] Corner-wrapped sheet-bending parts are widely distributed in the corner areas of aircraft cargo doors, boarding doors, service doors and other door frames. The large flange on the outer edge is attached to the skin of the fuselage. corner. In order to ensure a tight fit with the door body, the step-type bending radius is small (usually R1.5mm-R2.5mm), and the curvature of the lower large opening edge changes rapidly. Along the fuselage course, the overall curvature of the corner-wrapped parts gradually increases , which increases the difficulty of forming parts. In order to achieve lightweight, ...

AI Technical Summary

Problems solved by technology

[0004] In order to reduce the amount of manual forming by workers, improve the forming limit of corner-wrapped parts, and solve the problem of wrinkling and wrinkling of the outer edge of the flange of corner-wrapped parts with multiple shape features such as variable curvature, large flange, multi-turn, small radius, and high edge during the forming process. Defects such as edge thinning and cracking, etc., the purpose of the present invention is to provide a method for integral deep drawing of stepped corner corner parts in the aircraft door area, so as to improve the mechanized processing ability of the parts

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