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Pre-forming method for tube hydroforming and device thereof

A hydroforming and preforming technology, applied in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of complex pipeline design and control system, insufficient space for the mold to arrange the propulsion cylinder, complex mold structure, etc.

Active Publication Date: 2010-12-29
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (1) For a variety of different sections, multiple propulsion cylinders need to be arranged, the mold structure is extremely complex, and the propulsion pipeline design and control system are also extremely complex;
[0013] (2) For various curved sections, the layout of the mold and the push cylinder often interferes;
[0014] (3) When the part is small, there may not be enough space in the mold to arrange the push cylinder;
[0015] (4) The overall cost of the mold is relatively high

Method used

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  • Pre-forming method for tube hydroforming and device thereof
  • Pre-forming method for tube hydroforming and device thereof
  • Pre-forming method for tube hydroforming and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] The preforming mold involved in this embodiment is mainly composed of two parts: an upper mold 10 and a lower mold 20 . Wherein the upper surface of the upper mold 10 is horizontal and connected with the upper base plate of the press. There are 9 features processed on the lower surface of the upper mold 10, which are: the horizontal part of the upper mold 1, the vertical wall of the upper mold 2, the transitional surface of the upper mold 3, the cavity of the upper mold 4, and the straight wall of the upper mold cavity extended Part 5, the connecting arc 6 of the upper mold (connecting part with arc), - the inclined wall of the upper mold 7, the connecting arc 8 of the upper mold, and the horizontal parting surface 9 of the upper mold. Their connection relations are respectively: the horizontal part 1 of the upper mold is connected at right angles to the vertical wall 2 of the upper mold, the vertical wall 2 of the upper mold and the cavity 4 of the upper mold are conne...

Embodiment 2

[0103] Except for the following differences, the pipe fittings were hydroformed as in Example 1.

[0104] The shape of the pipe is rectangular. Compared with the size of Embodiment 1, the width of the final part of Embodiment 2 is only 48.8 mm, and the diameter of the pipe is still 60 mm. The method and device according to the present invention can still successfully "compress" the tube from 60 mm in width direction to only 48.8 mm.

[0105] In embodiment 2, after the tube is put into the mold, the tube is also in a "suspension" state, and finally can be formed by pasting the mold. After mold clamping is completed, the gap between the vertical side walls of the upper and lower molds is 1mm.

[0106] In this embodiment, the arc radius of the connecting arc 8 of the upper mold and the arc chamfering 6' of the lower mold is preferably in the range of 15-20mm. The included angle α between the inclined wall 7 and the mold clamping direction is in the range of 10-15°.

Embodiment 3

[0108] Except for the following differences, the pipe fittings were hydroformed as in Example 1.

[0109] The final geometry of the pipe fittings in Example 3 is very special. Although the final part width of 69.8mm is greater than the pipe diameter of 60mm, after the pipe is put into the mold, the pipe wall is not in contact with the vertical side of the lower mold, which makes the pipe also in the "lower mold" "outside", the part of the tube located at the "outside" of the lower mold needs to be "squeezed" into the lower mold by the method and device of this patent.

[0110] In this embodiment, the arc radius of the connecting arc 8 of the upper mold and the arc chamfering 6' of the lower mold is preferably in the range of 20-25mm. The included angle α between the inclined wall 7 and the mold clamping direction is in the range of 15-20°.

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Abstract

The invention discloses a pre-forming method for tube hydroforming and a device thereof. The device is composed of an upper mould and a lower mould; the section shape of the upper mould comprises a horizontal part (1), a straight vertical wall (2), a transition molded surface (3), a mold cavity (4), a cavity straight wall extension part (5), a connecting part (6) with radian, an inclined wall (7), a connecting circular arc (8) and a horizontal parting surface (9); the section shape of the lower mould comprises a horizontal part (1'), a straight wall cavity extension part (2'), a mold cavity (3'), a transition molded surface (4'), a straight vertical wall (5 '), an arc chamfer (6') and a horizontal parting surface (7'); the transition molded surface (3) of the upper mould is used for connecting the mold cavity (4) and the straight vertical wall (2) and consists of two circular arcs with opposite vector directions; and the structure of the transition molded surface (4') of the lower mould is the same as that of the transition molded surface (3) of the upper mould. According to the invention, performing processes in hydroforming with different space shapes and sections all can be realized by a mould assembling action, thus having no need of extra hydro cylinder arrangement, complex piping design and extra method control, and improving the stability and efficiency.

Description

technical field [0001] The invention relates to a hydroforming method and its device, in particular, the invention relates to a pipe fitting hydroforming preforming method and its device. Background technique [0002] In various modern industrial fields such as aircraft, navigation, aerospace equipment and automobiles, reducing the weight of mechanical parts to save materials and energy during operation is one of the trends in the development of modern manufacturing technology. It is against this background that the hydroforming method was developed as an advanced manufacturing technology, which can be effectively used to manufacture hollow lightweight structural parts. As a result, the strength and rigidity of the formed parts are improved, materials are saved, and costs are reduced. [0003] The basic procedures of the above-mentioned hydroforming method for manufacturing hollow lightweight structural parts are as follows: [0004] First put the pipe 30 in the lower die ...

Claims

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Application Information

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IPC IPC(8): B21D26/02B21D37/10
Inventor 蒋浩民苏海波陈新平杨兵范频
Owner BAOSHAN IRON & STEEL CO LTD