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Crease-resistant device for stamping forming of large curved-surface thin-wall component

A thin-walled member, stamping forming technology, applied in the field of stamping forming, can solve the problems of high maintenance cost and complex mold shape, and achieve the effects of reducing free surface area, improving forming accuracy, improving stress state and bulging components

Inactive Publication Date: 2021-09-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods are all based on multi-point forming molds, the mold shapes are complicated, and the maintenance cost is expensive. Therefore, the anti-wrinkle method suitable for general-purpose molds has become a technical problem to be solved urgently in this field.

Method used

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  • Crease-resistant device for stamping forming of large curved-surface thin-wall component
  • Crease-resistant device for stamping forming of large curved-surface thin-wall component
  • Crease-resistant device for stamping forming of large curved-surface thin-wall component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, the bottom of the rocket storage tank is taken as the experimental object, and the anti-wrinkle device is mainly composed of a punch 2, a die 4, a coil spring 6, a wedge 8 and an elastic ring 9. The wedge 8 moves relative to the die 2 through the wedge guide rod 7 , the coil spring 6 is arranged in the wedge guide rod 7 , and the elastic ring 9 is arranged outside the wedge 8 . before molding figure 1 As shown, the coil spring 6 is in a free state, restricting the wedge 8 at a specified position. When the punch moves downward, the wedge 8 moves horizontally inward along the wedge guide rod 7 due to pressure and compresses the coil spring. 6, such as figure 2 As shown, the compression of the coil spring 6 gives a reverse force to the wedge 8, so that the elastic ring 9 is always attached to the sheet 3 during forming, and finally a formed component is obtained.

[0028] In this embodiment, the anti-wrinkle method of stamping and forming large-scale...

Embodiment 2

[0030] In this embodiment, the bottom of the rocket storage tank is used as the experimental object, and the anti-wrinkle device replaces the coil spring, wedge, and elastic ring in Embodiment 1 with an integral elastic pad 11 . before molding image 3 As shown, the elastic pad is not affected by force; when the punch moves downward, the elastic pad will move along with the sheet, and due to the reaction force of the elastic pad, the sheet will always stick to the elastic pad, changing the original stress of the sheet state, reducing the tensile stress of the sheet in the wrinkled area, and suppressing the wrinkling of the sheet, the final result of forming is as follows Figure 4 As shown, the elastic pad 11 will finally cooperate with the groove reserved in the die 4, so that the blank can be stamped into a specified shape.

[0031] In this embodiment, the anti-wrinkle method of stamping large-scale curved thin-walled components adopts an integral elastic pad, which replace...

Embodiment 3

[0033] In this embodiment, the reflective surface of the satellite is used as the experimental object. In order to meet the situation that the convex and concave molds of the mold are inverted, the anti-wrinkle device in this embodiment is as follows: Figure 5 shown, with figure 1 Similarly, the way of wedges and springs is also used. When the die descends with the press beam 1, it first contacts with the blank holder 12, and then moves downward along the hydraulic tappet together with the blank holder. During the whole process, The punches are all fixed, and the forming results are as follows Figure 6 shown.

[0034] The anti-wrinkle method of stamping large-scale curved thin-walled components in this embodiment is similar to that of Embodiment 1. The relative movement of the elastic elements is used to achieve the effect that the mold changes with the deformation of the sheet metal, so that the unsupported area at the beginning of the forming stage is always elastically s...

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Abstract

The invention relates to a crease-resistant device for stamping forming of a large curved-surface thin-wall component. The crease-resistant device comprises a female die and a male die, and an elastic device enabling the female die to be in full contact with a plate all the time when the plate is formed is arranged between the female die and the male die. The crease-resistant device mainly overcomes the defect of wrinkling in a free surface area of a gap between a male die and a female die when spherical components such as satellite reflecting surfaces and rocket tank bottoms are stamped, and the core principle of the device is that the free surface area of the area is reduced, so that when the male die moves downwards, the female die can deform along with the shape and always keep full contact with a plate, sufficient constraint is provided, and the uniform flowability of the plate is improved, so that the defects of wrinkling and the like of the component are inhibited.

Description

technical field [0001] The invention relates to the field of stamping and forming, and more specifically relates to a stamping and forming anti-wrinkle device for large curved thin-walled components. Background technique [0002] In order to meet the strict requirements of aerospace, automotive and other industrial fields, the demand for large curved thin-walled components with high forming precision is constantly increasing, such as satellite reflectors and the bottom of rocket tanks. At present, most of the large-scale curved thin-walled components are formed by sheet metal stamping. Since the thickness of the sheet is much smaller than the length and width of the sheet, when the locally generated tangential compressive stress of the sheet makes the thickness of the sheet reach the limit of instability, it will be in the thickness direction. When plastic instability occurs, a blank holder is usually used to assist sheet forming to achieve the purpose of eliminating wrinkli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/22B21D37/12
CPCB21D22/22B21D37/12
Inventor 胡志力华林芦俊杰
Owner WUHAN UNIV OF TECH
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