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Forming method of large-size curved surface thin-wall metal skin

A curved, thin-walled technology, applied in the field of forming large-sized curved thin-walled skins, can solve the problems of high component manufacturing cost, long production cycle, and high equipment requirements, and achieve the effect of easy replacement

Active Publication Date: 2020-03-17
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the problem of high component manufacturing cost, long production cycle, high requirements for mold tooling manufacturing equipment, high requirements for mold tooling manufacturing equipment, and heavy use due to the need to separately manufacture large-sized molds and tooling when the existing stamping method is used to manufacture large-size curved wall panels and thin-walled skins. To solve the problem of high equipment requirements, a forming method for large-scale curved thin-walled metal skin is proposed

Method used

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  • Forming method of large-size curved surface thin-wall metal skin
  • Forming method of large-size curved surface thin-wall metal skin
  • Forming method of large-size curved surface thin-wall metal skin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see image 3 Explain, a kind of forming method of large-scale curved surface thin-walled metal skin, concrete steps are as follows:

[0034] Step 1. According to the assembly relationship between the curved wall panel and the thin-walled skin, extract the position and size characteristics of the stiffener on the curved surface panel;

[0035] Step 2. Assuming that the assembled thickness between the curved wall panel and the thin-walled skin is m, determine the size of the forming punch based on the shape and size of the curved wall panel, and use the forming surface size of the punch as a benchmark to measure the forming surface along the method. The outer side of the line is offset by m thickness to obtain the inner surface characteristics of the die;

[0036] Step 3, according to the thickness of the curved wall plate, determine that the size of the discrete support mold is consistent with the size of the curved surface wall plate, and determine the forming surface ...

Embodiment 2

[0043] see Figure 4 Explain, a kind of forming method of large-scale curved surface thin-walled metal skin, concrete steps are as follows:

[0044] In step 6, n discrete support molds are distributed on the punch, and the dispersed position of the support mold can be determined according to the position of the reinforcing rib on the curved wall plate, and the replacement rib of the support mold is distributed on the punch, and discrete The scattered positions of the supporting dies of the supporting dies can also be adjusted according to the forming conditions of the thin-walled slab after forming, which is the same as that in Embodiment 1.

[0045]When the plate is formed by the integral mold, due to the uneven load distribution and different contact states on the slab, it is easy to wrinkle and warp during forming, and there is a certain distance between the discrete support molds. By adjusting the discrete Supporting the position of the mold on the punch can easily elimin...

Embodiment 3

[0047] see Figure 5 Explain, a kind of forming method of large-scale curved surface thin-walled metal skin, concrete steps are as follows:

[0048] In step six, the discrete support mold and the punch can be effectively connected by bolts, and the discrete support mold is composed of multiple small molds with surface shape and size requirements. Each discrete supporting mold adopted in other steps is composed of a plurality of small mold blocks, and gaps exist between adjacent small mold blocks. Other steps are the same as in the first embodiment.

[0049] In the traditional stamping forming process, most of the molds adopt the integral form, which is prone to excessive local contact stress and unnecessary deformation. The discrete support mold composed of multiple small mold blocks is only in partial contact with the thin-walled slab, and the areas on the thin-walled skin that do not need to be assembled with the reinforcing ribs are in a relatively free state, which can a...

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Abstract

The invention provides a forming method of a large-size curved surface thin-wall metal skin. The forming method comprises the steps that the position and size characteristics of reinforcing ribs on acurved surface wall plate are extracted aiming at the assembly relationship between the curved surface wall plate and the thin-wall skin; the thickness of the assembled curved surface wall plate and thin-wall skin is assumed to be M, the size of a forming male die is determined by taking the inner surface of the curved surface wall plate as a reference, and the forming surface of the male die is offset by the thickness M along the outer side of a normal line to obtain the inner surface characteristics of a female die; the thickness dimensions of discrete support dies are consistent with the thickness dimension of the curved surface wall plate, and the forming surfaces of the discrete support dies are determined by taking the inner surface of the formed thin-wall skin as a reference; according to the size and distribution of the reinforcing ribs on the curved surface wall plate, the number of the discrete support dies is set to be consistent with the number N of the reinforcing ribs, and the positions of the discrete support dies on the male die are consistent with the positions of the reinforcing ribs on the curved surface wall plate; and the curved surface thin-wall plate blank isstamped and formed by utilizing the male die and female die combining the discrete support dies to obtain a required thin-wall skin member.

Description

technical field [0001] The invention relates to a forming method of a metal skin, in particular to a forming method of a large-size curved thin-walled skin. Background technique [0002] In the fields of aerospace and weaponry, realizing lightweight structures is one of the most important goals pursued. In order to reduce the weight of the structure, it is necessary to optimize the design of the components under the premise of meeting the requirements of use. For example, there are many lightweight hollow composite structures on rockets or missiles, such as wall panels of rocket fuel storage tanks and fairings of missiles. Such lightweight structures typically consist of curved panels and associated thin-walled skins. Curved panels are generally composed of thin-walled webs and stiffeners connected to them, and the ribs are used to increase the overall stiffness of the panel. In order to further improve the rigidity of the curved panel and realize the continuity of the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D39/02B21D37/10
CPCB21D37/10B21D39/02B21D22/02B21D37/20B21D53/92
Inventor 何祝斌刘建树凡晓波于江祥
Owner DALIAN UNIV OF TECH
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