Wingtip cover mirror face part drawing processing method

Abstract

The invention discloses a wingtip cover mirror face part drawing processing method, which comprises the following steps: according to a size, which is obtained after the contour line of the opening of a female die is deflected outwards at a preset value, of the drawing die, making blank materials in irregular elliptic shapes by using a mechanically polished skin material; uniformly applying lubricating oil on the round corner parts of the female die as well as the inside and outside surfaces of an upper molding cavity in a pressing face of the drawing die consisting of the female die and a male die, and the surfaces, which are contacted with the round corner parts and the inside and outside surfaces, of the blank materials; placing the blank materials in a drawing die with the fiber direction of the blank materials consistent with the length direction of the blank materials; covering a layer of rubber skin between the female die and the blank materials; drawing under a drawing pressure of 3 to 5Mpa and an edge pressure of 3 to 5Mpa; keeping for 5 to 10 seconds after drawing; and relieving pressure, and taking part out. The surface of the mirror face part thus obtained does not have slip lines and coarse grains and is smooth without scraps, so the mirror face part meets the quality requirements for mirror parts and defect products are avoided basically.

Description

technical field [0001] The invention relates to the manufacturing field of aircraft parts, in particular to a drawing die manufacturing and drawing processing method for aircraft wingtip cover mirror parts. Background technique [0002] The wingtip cover is a mirror part on the horizontal tail of the aircraft. It is connected with the composite wingtip cap with a connecting plate to form a wingtip assembly, which is installed on the horizontal tail of the aircraft. Such as figure 1 Shown is a schematic diagram of the structure of the wingtip assembly, where 101 is a wingtip cover, 102 is a composite wingtip cap, and 103 is a connecting strip. [0003] The wingtip cover mirror parts are obtained by deep-drawing the mechanically polished skin material. The so-called machine-polished skin material exhibits a high-quality reflective appearance with uniform color grade, finish and reflectivity for unpainted aircraft. [0004] The manufacturing difficulty of the wingtip cover m...

AI Technical Summary

Problems solved by technology

[0004] The manufacturing difficulty of the wingtip cover mirror parts lies in: in the deep drawing of the mirror surface of the mechanically polished skin material, the mirror surface is easily scratched in the mold cavity; Phenomenon (also known as "orange peel phenomenon"), if the secondary stretch forming is used, the mirror surface is difficult to guarantee; the connection between the rounded corner of the part and the straight wall section is easy to produce a round mouth groove of the die; the precision of the part is high, and the shape Dimensional tolerance is 0.25mm

[0005] The surface of the current wingtip cover mirror parts is shallowly polished, and there are concave die round grooves at the junction of the rounded corners of the parts and the straight wall sections, which seriously affects the surface quality of the parts; and the scrap rate of the parts manufactured abroad is relatively high.

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