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Metal formed product including tubular part having slit and manufacturing method therefor, and manufacturing device and die used for same

A technology of metal forming, manufacturing method, applied in the field of manufacturing devices and molds

Inactive Publication Date: 2017-12-01
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, how to use UO forming technology to compress the hollow profile along the circumferential direction has not been disclosed by Patent Document 6
Moreover, the method of Patent Document 6 does not envisage arbitrarily controlling the width of the slit

Method used

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  • Metal formed product including tubular part having slit and manufacturing method therefor, and manufacturing device and die used for same
  • Metal formed product including tubular part having slit and manufacturing method therefor, and manufacturing device and die used for same
  • Metal formed product including tubular part having slit and manufacturing method therefor, and manufacturing device and die used for same

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0191] In the first embodiment, an example of the metal formed article of the present invention will be described. The metal formed article of the present invention includes a tubular portion having a slit. A section in a direction perpendicular to the axial direction of the tubular portion (section in the circumferential direction) is schematically shown in figure 1 middle. The metal formed product 1 includes a tubular portion 1 e in which the slit 3 is formed, and in a typical case, the metal formed product 1 consists of only the tubular portion 1 . In the slit 3, the two ends E1 and E2 face each other. In another viewpoint, the metal formed product 1 is a substantially closed section part (a tubular part having a substantially closed section). Here, the "substantially closed cross-section" means a cross-section in which a gap exists between two facing ends of a metal plate formed into a tubular shape. The substantially closed cross-section part may have a gap over the ...

no. 2 Embodiment approach

[0194] In the second embodiment, an example of the manufacturing method of the present invention and a mold used therefor will be described. In addition, in the following embodiment, an example of the case of manufacturing the metal formed article which consists only of a tubular part is demonstrated. The manufacturing method of the second embodiment includes step (i) and step (ii).

[0195] Process (i) is schematically shown in Figure 2A and 2B . First, if Figure 2A As shown, a metal plate (blank) 1 a is disposed between the die 11 and the punch 12 . The female die 11 and the punch 12 are dies for U forming. Next, if Figure 2B As shown, a metal plate 1a is press-formed to form a U-shaped portion 1b having a U-shaped cross section. Such as Figure 2C As shown, the U-shaped portion 1b has two ends E1 and E2.

[0196] In step (i), the size relationship between the width W of the portion of the metal plate that will become the tubular portion (tubular portion 1e) and ...

no. 3 Embodiment approach

[0209] In the third embodiment, another example of the manufacturing method of the present invention and the mold used therefor will be described. The manufacturing method of the third embodiment includes step (i) and step (ii). The step (i) is the same as the step (i) described in the second embodiment, and thus redundant description will be omitted.

[0210] exist Figure 4A The die used in the step (ii) of the third embodiment is schematically shown in . The mold 30 of the third embodiment is an example of the above-mentioned mold (b). The mold 30 includes an upper mold (first mold) 31 and a lower mold (second mold) 32 .

[0211] The upper mold 31 has a plate-shaped protrusion 33 for forming the slit 3 . The upper die 31 includes a main body portion 31a and a movable portion 31b that can relatively move with respect to the main body portion 31a. The movable part 31b is disposed on the top of the pressing surface 31ap of the main body part 31a, and includes a protrusion...

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Abstract

This disclosed manufacturing method is a manufacturing method for manufacturing a metal formed product including a tubular part (1e) having a slit (3). This manufacturing method includes: a step (i) for forming a U-shaped part that has a U-shaped cross section, by deforming a sheet metal; and a step (ii) for forming the tubular part (1e) having the slit, by deforming the U-shaped part using a die (20) having a protrusion (23), in such a way that the protrusion is held between the two ends of the U-shaped part. In the step (ii), a cross-sectional circumferential length LH of the tubular part (1e) is made shorter than a cross-sectional length LU of the U-shaped part.

Description

technical field [0001] The present invention relates to a metal formed product including a tubular portion having a slit, a method of manufacturing the same, and a manufacturing device and mold used therefor. Background technique [0002] Auto parts and home appliances often use tubular parts. Accordingly, the development of techniques for manufacturing tubular components has been advanced. UO forming is known as a typical method of manufacturing tubular components using a metal plate (for example, Patent Documents 1 and 2). [0003] In recent years, in the field of automobiles, there has been a demand for tubular components having slits along the lengthwise direction. As a method of manufacturing such tubular components, a method of performing multiple bending processes has been conventionally used. However, this method has problems in that it is difficult to form parts with complicated shapes and that the process is complicated. Therefore, the application of UO forming...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D5/01
CPCB21D5/015B21C37/0815B21D5/01B21D37/10B21D5/10
Inventor 佐藤雅彦吉田亨
Owner NIPPON STEEL CORP
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