Upsetting method and upsetting apparatus

A processing device and processing method technology, applied in metal processing equipment, engine components, mechanical equipment, etc., can solve problems such as damage to product value and poor shape

Inactive Publication Date: 2008-01-23
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this upsetting process, if the blank is longitudinally bent during processing, the obtained product (upset processed product) becomes defective in shape (wrinkled, sandwiched, etc.), and its value as a product is impaired

Method used

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  • Upsetting method and upsetting apparatus
  • Upsetting method and upsetting apparatus
  • Upsetting method and upsetting apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0320] Next, specific examples of the present invention will be shown below. However, the present invention is not limited to the cases shown in this example.

[0321] Prepare a round bar-shaped blank 1 made of continuous casting and rolling parts with a diameter equivalent to 12 mm and a round bar-shaped blank 1 made of extrusions with a diameter of 12 mm produced by the Propezer aluminum wire continuous casting and rolling method . The material of each blank 1 is aluminum alloy of alloy number A6061 in accordance with JIS (Japanese Industrial Standards). Then, these blanks 1 are roughed by using the upsetting apparatus 1D of the fourth embodiment described above. Next, the molding pressure required at that time was investigated. The results are shown in Table 1. In addition, the lengths of the diameter-expanding planned portions 2 of the blank 1 were all 200 mm.

[0322] Table 1

[0323] Types of blanks

way to heat up

heating temperature

cool do...

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PUM

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Abstract

The present invention provides an upsetting method capable of unevenly expanding the diameter of a portion to be expanded in the circumferential direction of a blank. A guide body (20) having an insertion hole (21) through which the planned diameter expansion portion (2) of the holding blank (1) is inserted in a vertical bending preventing state is prepared. A protruding piece portion (22) for suppressing diameter expansion that protrudes in the axial direction of the guide body (20) is integrally provided on a part of the front end portion (20a) of the guide body (20). The predetermined diameter expansion portion (2) of the blank (1) fixed in the stationary mold (10) is inserted and held in the insertion hole (21) of the guide body (20). Next, while moving the punch (30) and pressing the portion (2) of the blank (1) to be enlarged by the punch (30) in the axial direction, the guide body (20) is directed toward the punch (30) is moved in the opposite direction of the moving direction, whereby the planned diameter expansion portion (2) of the blank (1) exposed between the front end portion (20a) of the guide body (20) and the fixed mold (10), The diameter expansion is performed in a state where the diameter expansion is suppressed for the contact portion of the planned diameter expansion portion (2) with the protruding piece portion (22).

Description

technical field [0001] The present invention relates to an upsetting method and an upsetting device for expanding the diameter of a predetermined portion of a bar-shaped blank. Background technique [0002] In general, upsetting is to expand the diameter of a portion to be expanded in diameter by pressing a rod-shaped blank in the axial direction. In this upsetting process, if the blank is longitudinally bent during the process, the obtained product (forged product) will have a shape defect (wrinkle, interlayer, etc.), and its value as a product will be impaired. Then, in order to prevent longitudinal bending, the following upsetting method has been conventionally known. [0003] That is, in this method, the blank is fixed in a fixed mold, and the planned diameter-expanding portion of the blank is inserted into the insertion hole provided on the guide body to hold the planned-diameter-expanding portion in a longitudinal bending prevention state. Next, the guide body is mov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/08B21K1/10
CPCB21J5/08
Inventor 大泷笃史
Owner SHOWA DENKO KK
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