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Closed forging method, forging prodn. system using method, forging die used in method and system, and preform or yoke produced by method and system

A technology of closed forging and preforms, which is applied to engine components, metal processing equipment, mechanical equipment, etc., to achieve the effect of reducing pressure and increasing output

Inactive Publication Date: 2007-02-07
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the branches 92 are long or cannot reach a consistent length (that is, each branch has a different shape), forging defects such as underfill and Overlap (shingling) on ​​the surface of forged products

Method used

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  • Closed forging method, forging prodn. system using method, forging die used in method and system, and preform or yoke produced by method and system
  • Closed forging method, forging prodn. system using method, forging die used in method and system, and preform or yoke produced by method and system
  • Closed forging method, forging prodn. system using method, forging die used in method and system, and preform or yoke produced by method and system

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0120] to be manufactured by forging figure 2 The shown yoke 43 for the connecting member of the vehicle suspension is designed as a forged material in the following manner from a cut workpiece of the JIS 6061 aluminum alloy material having the same volume as the yoke 43 .

[0121] The volume of the yoke 43 is calculated using a CAD system programmed in the computer. According to the calculation results, the volume of the cut workpiece is designed to be 38.8cm 3 . The tolerance of the cut workpiece volume is determined to be ±1% of the calculated volume of the yoke.

[0122] Next, the thickness (T) of the workpiece to be cut is designed to be 34mm, that is, the forged product in the pressing direction (by Figure 13 0.95 times the lateral length (t) of the projected surface on which the reference letter A in the Figure 14 )express. Based on the volume and thickness of the cut piece, the diameter of the cut piece is determined by the following equation:

[0123] ...

example 2

[0145] in order to manufacture Figure 18 Shown as a yoke for a connecting member for vehicle suspension, a cut workpiece of JIS 6061 aluminum alloy having the same volume as the yoke is designed as a forged material in the following manner.

[0146] The volume of the yoke is calculated with a CAD system program programmed in the computer. According to the calculation results, the volume of the cut workpiece is designed to be 84.0cm 3 . The tolerance of the volume of the cut workpiece is determined to be ±1% of the calculated volume of the yoke.

[0147] Next, the thickness of the cut workpiece is designed to be 30mm, which is the Figure 19 0.95 times the lateral length (t) of the projection surface in the pressing direction D shown, the lateral length is Figure 20 is represented by the reference letter E. Based on the volume and thickness of the workpiece to be cut, the diameter (R) of the workpiece to be cut is determined by the following equation:

[0148] ...

example 3

[0156] The thickness of the disc-shaped cut workpiece obtained from the round bar material is designed to be 25 mm, i.e. Figure 14 0.7 times the lateral length indicated by the reference letter B. The diameter R of the workpiece to be cut is determined to be 44mm by the following formula:

[0157] R = 2 × ( 38 , 800 / ( 25 π ) ) .

[0158] Here, R satisfies the condition: R≤( Figure 14 The longitudinal length (L) indicated by the reference letter C in .

[0159] Forging was performed with this cut workpiece in a similar manner to Example 1. As a result, since the cut workpiece (forging material) was unstable and inclined in the forging die during forging, the percentage of forgin...

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Abstract

A closed forging method for producing a forged product includes preparing as a forging material a cylindrical cast ingot that has a volume the same as the volume of a forged product and assumes a shape having an upper surface, a lower surface and a side surface and containing no angular portion; and applying pressure to the side surface of the forging material. The shape has a ratio of the lateral length of a projection profile of the forging material as viewed in the direction perpendicular to the direction of pressure application to a length of the forging material as measured in the direction of pressure application is 1 or less. The forged product obtained is a preform of an upper arm or a lower arm with a plurality of branches that is a suspension part for a vehicle or a yoke with a plurality of branches that is a joint part employed in a vehicle suspension. The preform or yoke has metal flow lines along each branch and exhibits enhanced mechanical strength.

Description

technical field [0001] The present invention relates to a closed forging method, a forging manufacturing (production) system using the method, a forging die (forging die) used in the method and the system, and a forging tool for a vehicle manufactured by the method and the system. The suspension part and the part consist of a kind of preform or yoke (fork, yoke). Background technique [0002] Attachments for vehicle suspension include a figure 2 The yoke 43 is shown with a plurality of branches (forks) 21 , 22 and 23 . [0003] Usually, as image 3 As shown, the yoke is forged from a solid round bar 31 to form a forged product with flash 32 formed around its periphery. [0004] Another way such as Figure 4 As shown, the article 43 (ie, the yoke) is formed by machining a portion 42 of a preform 41 of a yoke that has been extruded and cut to substantially the same shape as the article. [0005] Recently, aluminum alloys are increasingly being used to replace iron in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21K1/06B21K1/74
CPCB21K1/74B21J5/02
Inventor 夏井政行中原隆文
Owner SHOWA DENKO KK
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