Design method of rubber forming mold of variable cross-section high-curvature differential flow adjusting cover part

A design method and technology for forming molds, applied in the field of sheet metal rubber forming, can solve the problems of inapplicability for mass production, poor surface quality of parts, and easy wrinkling of parts, and achieve simple structure, high tire reliability and smooth surface. Effect

Inactive Publication Date: 2019-02-01
HARBIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Variable cross-section, high curvature difference fairing parts are more complicated in the deformation of the wool during the drop forming process, and the constraints on it by the mold are poor, and the parts are prone to wrinkles, cracks and positional displacement.
Therefore, the surface quality of parts formed by drop pressing is poor, the shape accuracy is low, and it is not suitable for mass production

Method used

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  • Design method of rubber forming mold of variable cross-section high-curvature differential flow adjusting cover part
  • Design method of rubber forming mold of variable cross-section high-curvature differential flow adjusting cover part
  • Design method of rubber forming mold of variable cross-section high-curvature differential flow adjusting cover part

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The front slide rail fairing parts of a new type of helicopter are made of 2A12 aluminum alloy material with a thickness of 0.8mm, see Figure 5 .

[0047] Design the shape and size of the punch according to the inner shape of the part. The end of the front slide rail fairing part has a large compression deformation. In order to avoid wrinkles, a bulging process allowance of 100mm is added; the end of the other side is stretched and deformed. To extend the allowance of 80mm, see Figure 6 .

[0048] 1) The concave mold is manufactured according to the size of the convex mold. The mold gap is taken on the concave mold, and the material thickness is 0.8mm for the gap. The compression deformation of one side of the middle area of ​​the front slide fairing part is relatively large, and a draw bead is added to the extension area of ​​the die, see Figure 7 .

[0049] 2) The upper surface of the die is consistent with the deformation of the part, and the lower surface is...

Embodiment 2

[0054] The lower saddle part of the air intake of a new helicopter is made of 6A02 aluminum alloy with a thickness of 1.2mm. See Figure 12 .

[0055] 1) Design the shape and size of the punch according to the inner shape of the part. The compression deformation of the two ends of the part is relatively large, and the bulging process allowance of 80mm is increased according to the shape. See Figure 13 .

[0056] 2) The concave mold is manufactured according to the cooperation of the convex mold, the mold gap is taken on the concave mold, and the material thickness of the gap is 1.2mm. The upper and lower surfaces of the die are flat, see Figure 14 .

[0057] 3) The inner shape of the pressing plate is manufactured according to the cooperation of the punch, the gap is taken on the pressing plate, and the material thickness is 1.2mm for the gap. The pressure plate and the lower surface are flat, see Figure 15 .

[0058] 4) For the rubber forming die structure of the low...

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Abstract

The invention belongs to the sheet metal rubber forming technology, and relates to a design method of a rubber forming mold of a variable cross-section high-curvature differential flow adjusting coverpart. The design mainly comprises a male mold, a female mold and a pressing plate, wherein the male mold is firstly designed according to the size of an inner contour of a part and the distribution of compression deformation; the female mold and the pressing plate are manufactured according to the male mold in a matching mode correspondingly; gaps are formed in the female mold and the pressing plate; an upper molded surface of the female mold is consistent with the deformation form of the part; a rib or a ridge is arranged on the female mold according to the compression deformation condition,and a lower molded surface of the pressing plate is manufactured according to the upper molded surface of the female mold in the matched mode. According to the method, the structure is simple, and only comprises the female mold, the pressing plate and the male mold; hydraulic forming equipment can be adopted for one-step forming, the time is short (for about 5 minutes), efficiency is high, afterthe rubber forming is carried out on the part, the part is free of defects such as fracture and wrinkling, a qualified rate can reach 100%, the surface of the part is smooth, a model profiling degreeis high, quality is good, manufacturability is stable, operability is high, and dependence on the technical level of operators is low.

Description

technical field [0001] The invention belongs to sheet metal rubber forming technology, and relates to a design method for a rubber forming mold of a fairing cover part with variable cross-section and high curvature difference. Background technique [0002] The traditional forming process of the fairing parts with variable cross-section and high curvature difference is to adopt drop forming, and then undergo shape correction or trimming to meet the drawing requirements. [0003] Drop forming is a sheet metal forming process that uses the impact force of a falling hammer to press a metal sheet into a required curved surface part. The mold adopts convex and concave mold structure without any subsidiary mechanism. (Literature "Aeronautical Manufacturing Engineering Handbook · Aircraft Sheet Metal Process", "Sheet Metal Stamping Process Manual"). The variable cross-section, high curvature difference fairing parts have more complicated wool deformation during the drop forming pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/20
CPCB21D37/20
Inventor 李海凤周原冰袁贺永
Owner HARBIN
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