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Two-pass deep drawing forming method for long annular lip with deep U-shaped section and beak-shaped middle

A secondary deep-drawing, beak-like technology, used in forming tools, aircraft parts, metal processing equipment, etc., can solve the problems of deep U-shaped narrow and long annular closed aluminum alloy lips with great disparity in length and width ratio, and reduce drawing. The effect of deep forming times, easy promotion and realization, and reduction of processing difficulty

Active Publication Date: 2021-12-03
XI'AN AIRCRAFT INTERNATIONAL
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Problems solved by technology

In order to solve the problem that the traditional two-pass deep drawing cannot form a deep U-shaped narrow and long ring-shaped closed aluminum alloy lip with a disparity in length and width, the purpose of the present invention is to provide a new type of reverse drawing combined with passive liquid-filled forming. deep drawing method

Method used

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  • Two-pass deep drawing forming method for long annular lip with deep U-shaped section and beak-shaped middle
  • Two-pass deep drawing forming method for long annular lip with deep U-shaped section and beak-shaped middle
  • Two-pass deep drawing forming method for long annular lip with deep U-shaped section and beak-shaped middle

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Embodiment Construction

[0052] Referring to the accompanying drawings, the aircraft sheet metal parts provided by the embodiment are as figure 1 As shown, the air inlet lip 1 is in the shape of an oblong ring as a whole, with a U-shaped cross-section, a wide ratio of length to width, a relatively narrow width direction, and a deep U-shaped cavity. The aluminum alloy lip 1 is composed of the lip inner wall 2 and the lip outer wall 3. The lip inner wall 2 and the lip outer wall 3 intersect at the boundary line 1 of the inner and outer walls of the lip. The assembly relationship of the lip 1 is complicated, and the precision of the inner and outer surfaces is high. The traditional two-pass deep drawing cannot form a deep U-shaped narrow and long ring-shaped closed aluminum alloy lip with a large length-to-width ratio.

[0053] Such as Figure 2 to Figure 12 As shown, a two-pass deep-drawing forming method for a beak-shaped long annular lip in the middle of a deep U section includes the following steps...

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Abstract

The invention provides a two-pass deep drawing forming method for a long annular lip with a deep U-shaped section and a beak-shaped middle. The two-pass deep drawing forming method comprises the steps that a forming working procedure piece is constructed; an initial working procedure piece is constructed; a first-time deep drawing forming die structure is determined; a second-time deep drawing forming die structure is determined; first-time hydrodynamic deep drawing forming is carried out; second-time deep drawing forming is carried out; and cutting and correcting are carried out. According to the two-pass deep drawing forming method, a determination method for the two-pass deep drawing of the forming working procedure piece and the initial working procedure piece is provided, the calculation is simple, the machining difficulty of the closed annular deep cavity structure with the protruding feature is reduced, the deep drawing forming frequency of the closed annular deep cavity structure is reduced, and the important practical value is achieved.

Description

technical field [0001] The invention relates to sheet metal parts forming technology in the field of aircraft manufacturing, specifically a two-pass deep-drawing forming method for a closed oblong annular lip with a deep U-shaped cross-section and a beak-shaped protrusion in the middle of the outer side and Forming mold. Background technique [0002] With the continuous development of aviation manufacturing technology at home and abroad, the new aircraft integrated engine lip structure is highly recommended due to its excellent aerodynamic shape and good sealing environment. The traditional engine lip adopts a split structure of 3-4 sections. After the split lip is formed, it is trimmed, repaired, and then riveted. Due to the uneven distribution of internal and external stress during the forming of the "U"-shaped open split lip, resulting in low mold fit, poor shape accuracy, and large springback after forming, it is difficult to fit in the assembly process, and the assembl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/22B21D37/10B21D53/92
CPCB21D22/22B21D37/10B21D53/92
Inventor 白颖鲁帆师鹏李奎邱晞
Owner XI'AN AIRCRAFT INTERNATIONAL
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