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Thin plate burring processing method and thin plate female screw-forming method

A processing method and round hole technology, which is applied in the field of thin plate round hole flanging processing and thin plate internal thread formation, can solve the problems of screw damage, increased tightening torque, uneconomical, etc.

Active Publication Date: 2013-06-19
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the tightening torque is increased in a state where the length of the threaded portion is short, screw damage is likely to occur
[0007] The conventional technique described in JP 2004-223583A is not economical because the thick convex portion is obtained only by forming the convex portion by drawing processing, and the through hole in the thick convex portion is formed by punching processing, and the punched round flat part is disposed of as waste

Method used

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  • Thin plate burring processing method and thin plate female screw-forming method
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  • Thin plate burring processing method and thin plate female screw-forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] figure 1 It is a view explaining the method of flanging a circular hole in a thin plate according to Embodiment 1. The thin plate round hole flanging processing method includes a first step of forming a thin portion thinner than the original thickness in the target portion by performing crush processing on a target portion of a flat-plate type workpiece, forming in the thin portion by punching processing A second step of a circular through hole, and a third step of forming an annular portion raised from the surface of the workpiece by performing protruding processing using round hole flanging processing around the through hole formed in the thin portion.

[0025] The method of flanging a circular hole in a thin plate according to this embodiment will be described in detail.

[0026] According to the thin plate round hole flanging processing method of this embodiment, such as figure 1 As shown in , a flat-plate type workpiece 11 is prepared, and this workpiece 11 is pl...

Embodiment 2

[0056] Next, a thin plate internal thread forming method according to Embodiment 2 will be described. The thin plate internal thread forming method of this embodiment includes: the first step, forming a thinner part in the target part by crushing the target part of the workpiece, and the second step, forming a thinner part in the target part by punching; A circular through hole is formed in the thin part, a third step of forming a ring-shaped part raised from the surface of the workpiece by performing protruding processing combined with round hole flanging processing around the through hole formed in the thin part, and a fourth step, forming internal threads in the inner wall surface of the annular portion.

[0057] Figure 7A , 7B It is a view explaining Example 2 respectively. Figure 7A is a view illustrating a state where internal threads are formed in the inner wall surface of the annular portion of the workpiece. Figure 7B Is a view illustrating a state where a work...

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PUM

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Abstract

The invention provides a thin plate burring processing method and thin plate female screw-forming method. The thin plate burring processing method includes a first step of forming a thin portion thinner than an original thickness in a target portion by performing crushing processing on the target portion of a plate-like workpiece, a second step of forming a circular through-hole in the thin portion by punching processing, and a third step of forming an annular portion rising from a surface of the workpiece by performing projection processing with burring processing around the through-hole formed in the thin portion.

Description

technical field [0001] The present invention relates to a sheet burring process method for forming a cylindrical raised portion in a thin plate by burring process and a sheet internal thread forming method for forming internal threads on the inner wall surface of the raised portion. Background technique [0002] It is well known to perform round hole flanging on the threaded portion of the workpiece so as to form a ring-shaped portion protruding outward from the surface of the workpiece in the threaded portion, and to fix parts or the like to a workpiece such as a metal plate by screws or to Internal threads are formed in the inner wall surface of the annular portion when the workpiece is fixed to a structure or the like. [0003] According to a conventional technique such as that described in JP H08-257646A, a circular through-hole is formed in advance in a target portion of a workpiece by punching before performing a circular hole flanging process, and a ring-like shape ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D19/08
CPCB21D19/088B21D35/001
Inventor 前田大树栗原弘和
Owner RICOH KK