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Two-piece one-die forming method for mutually symmetrical characteristic pieces

A characteristic and symmetrical technology, applied in the field of two-piece one-mold forming, can solve the problems of difficulty in guaranteeing the forming quality of parts, high manufacturing cost, and long R&D cycle, etc., and achieve shortened train production time, low manufacturing cost, and faster filling space Effect

Active Publication Date: 2021-07-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems that the large-scale aluminum alloy skin covering parts used in the existing trains have a long research and development period, high manufacturing costs, and difficulty in ensuring the quality of the parts, a two-piece one-piece for symmetrical feature parts is provided. molding method;

Method used

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  • Two-piece one-die forming method for mutually symmetrical characteristic pieces
  • Two-piece one-die forming method for mutually symmetrical characteristic pieces
  • Two-piece one-die forming method for mutually symmetrical characteristic pieces

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specific Embodiment approach 1

[0035] Specific implementation mode one: refer to Figure 1 to Figure 4 Describe this embodiment, this embodiment provides a kind of two-piece one mold forming method that is used as symmetrical feature part, described method is carried out through the following steps:

[0036]Step 1: Design the mold: For two large aluminum alloy skin panels with shallow cavities that are symmetrical in space, first design the upper mold 1, determine the cavity size according to the surface shape of the part, and consider the effects of thermal expansion and contraction, and ensure that the edge banding platform 6 It is completely on a plane parallel to the press table, and the basic shape of the lower mold 4 can be obtained with respect to the mirror image of this plane. On this basis, the edge banding platforms 6 in the upper mold 1 and the lower mold 4 are respectively provided with misaligned edge banding grooves 7. A guide mechanism 8, a positioning reference block 9, a thermocouple hole ...

specific Embodiment approach 2

[0045] Specific implementation mode two: refer to Figure 1 to Figure 4 This implementation mode is described. This implementation mode is to further limit the step one described in the first specific implementation mode. In this embodiment mode, the depth of the shallow cavity provided in the large aluminum alloy skin cover in the first step is less than 200mm. Other compositions and connection methods are the same as those in Embodiment 1.

[0046] With such a setting, considering the application range of inflatable forming, if the required depth of the shallow cavity is too large, it will be difficult for inflatable forming to meet the requirements. At the same time, the continuous expansion of the gas will lead to stress on the shallow cavity area of ​​the large aluminum alloy skin cover. Uneven, easy to affect the forming effect.

specific Embodiment approach 3

[0047] Specific implementation mode three: refer to Figure 1 to Figure 4 Describe this embodiment, this embodiment is to further limit the step 1 described in the second specific embodiment, in this embodiment, in the mold structure in the step 1, both the upper mold 1 and the lower mold 4 need to have an air inlet The plane of hole 5 and edge banding platform 6 is parallel to the press platform, and square sealing grooves need to be designed on both the upper mold 1 and the lower mold 4. The two sealing grooves must be misaligned. A jaw 11 is designed every 400mm on the edge banding platform 6 in the middle and the edge banding platform 6 in the lower mold 4 . Other compositions and connection methods are the same as those in the second embodiment.

[0048] In this way, the offset setting of the sealing grooves in the two molds can effectively ensure that the sheet material can fully flow into the upper and lower edge sealing grooves, so that both sides have a good airtight...

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Abstract

The invention discloses a two-piece one-die forming method for mutually symmetrical characteristic pieces, and belongs to the technical field of gas forming. The problems that a large aluminum alloy skin covering piece used in an existing train is long in research and development period, high in manufacturing cost and difficult to guarantee part forming quality during forming are solved. According to the two-piece one-die forming method for the mutually symmetrical characteristic pieces, the production situation that two sets of dies are needed for symmetrical large covering pieces on the left side and the right side of a rail train is effectively improved, the design and manufacturing period of high-speed rails which pursue efficiency more and more is met, the die cost can be greatly saved, and the train production time can be greatly shortened; and meanwhile, the design of a movable block is added in the die, on one hand, the movable block can play a role in filling volume to facilitate gas filling, and on the other hand, the movable block can further be used for dispersing the local wall thickness of a plate through the reverse expansion molded surface, flexible adjustment can be achieved, and the positive effect on defect avoidance is achieved.

Description

technical field [0001] The invention belongs to the technical field of gas forming, and in particular relates to a two-piece one-mold forming method for mutually symmetrical feature parts. Background technique [0002] In order to facilitate people's growing travel needs, more and more cities have begun to build and improve the radiation traffic network from the central city to the surrounding areas. While the rail lines connect thousands of households, the supply of rail transit vehicles is also proposed. , Environmental requirements. At present, based on the principle of light weight, the materials used for the skin of intercity rail trains mainly include FRP and aluminum alloy. FRP is also called glass fiber reinforced plastic. Manufacturing and production, but at the same time it is difficult to recycle, and the maintenance cost in the life cycle is high, and the overall life is short; aluminum alloy can be exempted from maintenance, and the material is also easy to rec...

Claims

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Application Information

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IPC IPC(8): B21D26/021B21D26/031B21D26/027B21D37/18
CPCB21D26/021B21D26/031B21D26/027B21D37/18
Inventor 王国峰林海朋杜志豪李振伦刘永康
Owner HARBIN INST OF TECH
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