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Molding method

A technology of forming processing and heating process, applied in the direction of forming tools, metal processing equipment, manufacturing tools, etc., can solve the problem of expanding the heating range and achieve the effect of stable current value

Pending Publication Date: 2022-07-19
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, although the above-mentioned heating electrode wear does not occur, on the other hand, there is a problem that the heating range extends beyond the vicinity of the punching end.

Method used

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Embodiment approach 1

[0041] Hereinafter, the present invention will be described based on the embodiments of the invention, but the technical aspects of the claims are not limited to the following embodiments. In addition, all the configurations described in the embodiments are not necessarily essential as means for solving the problems.

[0042] figure 1 It is a schematic diagram which shows roughly the process of the shaping|molding processing method of this embodiment. The forming method described below is a method of forming a flange 102 by providing a perforation 101 in a steel sheet 100 as a workpiece, and deforming the peripheral edge of the perforation 101 .

[0043] like figure 1 As shown, the forming method of the present embodiment includes, for example: a blanking step of blanking the steel sheet 100; a heating step of heating the blanked end 103; a natural cooling step of cooling the heat generated by the heating step; and forming the blanked end 103 The stretch flange forming proc...

Embodiment approach 2

[0082] In the second embodiment, the steel sheet formed product punched out in the above-mentioned punching step is placed in a heating jig in the heating step, and heated. Figure 17 It is a figure which shows an example of a heating jig. Figure 17 The figure on the left shows the state before the formed steel sheet X is arranged on the heating jig 400 , and the figure on the right shows the state after the formed steel product X is arranged on the heating jig 400 .

[0083] like Figure 17 As shown, the heating jig 400 includes a heating coil 1 for heating the punched end 103 of the steel sheet formed product X, a positioning guide 2 for positioning the steel sheet formed product X at a predetermined position, and a base portion 3 . An AC power source 4 for supplying electric power to each heating coil 1 is connected to each heating coil 1 .

[0084] The shape and arrangement of the positioning guides 2 are set so that the position of the steel sheet formed product X is n...

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Abstract

Provided is a molding method in which only a punched end is locally heated while stabilizing the current value of a heating electrode during heating. The molding method includes: a punching step of punching a steel plate; and a heating step in which a heating coil is disposed so as not to be in contact with the end surface of the punched end formed in the punching step and so as to face the end surface, and a current is caused to flow through the heating coil to generate an induced electromotive force on the steel sheet, thereby heating the end surface.

Description

technical field [0001] The present invention relates to a method for forming a steel sheet. Background technique [0002] One of the problems of press forming of high-strength materials includes stretch flange cracking. This tensile flange crack is caused by the residual strain of the sheared end face such as the punched end in the punching process. As a method of reducing the residual strain, a method of heating is known. In addition, as a method of heating the residual strain portion, there is known a forming method in which a heating electrode is brought into contact with a punched end, and the punched end is energized and heated to remove the residual strain (for example, see Japanese Patent Laid-Open No. 2020-116635 ). ). [0003] However, according to one embodiment of the above-described forming method, the heater electrode is in direct contact with the punched end. Therefore, when the heater electrode is repeatedly brought into contact with the punched end throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D28/26B21D37/16
CPCB21D28/26B21D37/16B21D19/088B21D28/02C21D1/42C21D9/60
Inventor 伊原智章
Owner TOYOTA JIDOSHA KK
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