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Drawing forming method for aluminum alloy aircraft engine hood

An aircraft engine and molding method technology, which is applied in the fields of aircraft engine hood manufacturing and aircraft parts drawing and forming, can solve the problems of poor finished product performance, numerous processes, and inadequate stress relief solutions, and achieves improved dimensional accuracy and appearance quality. , the process is simple, the effect of shortened steps

Pending Publication Date: 2022-05-27
CHENGDU DERUI AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is: in order to solve the problem that the existing method of drawing and forming the aluminum alloy engine cover has many procedures, the stress release is not in place, and the performance of the finished product is not good

Method used

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  • Drawing forming method for aluminum alloy aircraft engine hood
  • Drawing forming method for aluminum alloy aircraft engine hood
  • Drawing forming method for aluminum alloy aircraft engine hood

Examples

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Comparison scheme
Effect test

Embodiment 1

[0045] see Figure 5-13 As shown, the present invention relates to a drawing method of an aluminum alloy aircraft engine cover, comprising the following steps:

[0046] Step 1. Place the aluminum alloy sheet in the hood integral forming mold;

[0047] Step 2. Turn on the hydraulic press to carry out nine stages of pressing. In the first stage, the hydraulic pressure of the hydraulic press is 12MPa, and the stroke of the ejector is 600mm; in the second stage, the pressure of the hydraulic press is 12MPa, and the stroke of the ejector is 450mm; the third stage The hydraulic pressure of the hydraulic press is 12MPa, and the stroke of the ejector is 400mm; the pressure of the liquid cushion of the hydraulic press in the fourth stage is 12MPa, and the stroke of the ejector is 350mm; the pressure of the liquid cushion of the hydraulic press in the fifth stage is 12MPa, and the stroke of the ejector is 300mm; The liquid cushion pressure of the hydraulic press in the stage is 15MPa, ...

Embodiment 2

[0051] On the basis of Example 1, the present invention relates to a drawing method for an aluminum alloy aircraft engine cover, and the tonnage of the hydraulic press is 1600T. The slider pressure of the hydraulic press is 15MPa. The upper limit of the liquid cushion of the hydraulic press is 600mm. The drawing oil used in the drawing is castor oil, and can also be lard or rapeseed oil.

Embodiment 3

[0053] On the basis of Example 2, the prior art for the manufacture of the engine hood is formed by three-piece plates and then riveted together. The main problem in this way is that the integrity of the engine hood is not good, and there are many processing procedures. This embodiment provides an integral molding die for a hood, see figure 1 and figure 2 As shown, it includes an upper die and a lower die, the lower die includes a lower die plate 1, a forming saddle 4 is installed on the top surface of the lower die plate 1, the contour of the forming saddle 4 is consistent with the outline of the engine hood, the upper die includes an upper die plate 9, and the upper die The top surface of the template 9 is provided with a molding cavity 11 , and the shape of the molding cavity 11 is consistent with the contour of the molding saddle 4 . A plurality of guide rods 2 are evenly installed on the lower mold plate 1, and the plurality of guide rods 2 are located in the vertical d...

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Abstract

The invention discloses a drawing forming method for an aluminum alloy aircraft engine hood, relates to the field of drawing forming of aircraft parts, and solves the problems that an existing method is various in working procedures, stress release is not solved in place, and the performance of a finished product is poor. The drawing forming method comprises the following steps that an aluminum alloy plate is placed in an engine hood integral forming die; the oil press is started to conduct nine-stage pressing, the liquid pad pressure, the ejector rod stroke and the pressing time of the oil press in each stage are controlled, and by arranging nine-stage pressing, the liquid pad pressure is limited to be gradually reduced, the ejector rod stroke is limited to be gradually shortened, and the situation that a plate is cracked due to the fact that a stretching gap is too small due to one-time pressing is avoided; meanwhile, the problems of surface wrinkling and the like of the product due to stress release in the forming process are avoided, and the situation that the manufactured finished product does not meet the quality requirement is avoided; a plate is formed at a time through the engine hood integral forming die, the forming process is shortened, and the performance defects such as overweight caused by riveting after conventional three-section forming are overcome.

Description

technical field [0001] The invention relates to the field of drawing and forming of aircraft parts, and more particularly to the field of aircraft engine hood manufacturing. Background technique [0002] In the field of aircraft manufacturing, the engine cover, for the aircraft, refers to the streamline shaping member located at the tail of the aircraft to smooth the outer surface of the fuselage to reduce flight resistance. Also known as "tail fairing", it is a dimensional rectification structure at the tail of the aircraft. For the tail dome installed with a jet engine in the fuselage, in addition to the dimensional rectification effect, it also ejects the airflow of the tail nozzle to improve thrust. effect. Because the engine cover is located in the high temperature area and tail of the aircraft, it is easy to be damaged. In order to facilitate replacement, a connection type that is partially fixed to the fuselage and partially detachable is often used. Its structure i...

Claims

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Application Information

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IPC IPC(8): B21D22/26B21D43/00B21D37/10B21D53/88
CPCB21D22/26B21D43/003B21D37/10B21D53/88Y02T50/40
Inventor 张昌志
Owner CHENGDU DERUI AUTO PARTS