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Press machine and pressing method

Inactive Publication Date: 2015-08-06
TOA IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method of pressing a steel plate to form a bent portion without causing wrinkles. This is achieved by heating the steel plate, mounting it on the lower die and pad portion, and then moving the upper die and regulation portion downward to hold the steel plate between them. The movement of the edge portion of the steel plate is then regulated to prevent wrinkle formation. The technical effects of this method are improved accuracy and quality of the bent portion formed in the steel plate.

Problems solved by technology

However, when the upper die is moved downward to draw the steel plate toward the step portion of the lower die, a wrinkle occurs in the end portion of the steel plate.
Although the wrinkle may be smoothed by being pressed at the end, there is a problem of decreasing the strength in the portion.

Method used

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  • Press machine and pressing method
  • Press machine and pressing method

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Embodiment Construction

[0018]An embodiment of the invention will be described referring to the figures. FIG. 5 is a partial plan view of a press machine 10, and FIGS. 1 to 4 are cross-sectional views of FIG. 5 along line X-X.

[0019]As shown in the figures, a lower die 1 is fixed on a base 2 and has a step portion 3 for forming a bent portion on a side surface. A pad portion 4 is disposed adjacent to the lower die 1 on the step portion 3 side in the horizontal direction. A portion of one side surface of the pad portion 4 is in contact with the lower side surface of the lower die 1 below the step portion 3.

[0020]The pad portion 4 is supported by a spring 5 (e.g. a gas spring) disposed on the base 2, being movable upward and downward.

[0021]An upper die 6 is disposed opposing the pad portion 4 in the vertical direction. A regulation portion 7 is disposed adjacent to the upper die 6 in the horizontal direction on the outside of the end of the lower die 1 in the horizontal direction. As shown in the cross-sectio...

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Abstract

A press machine includes a lower die having a step portion for forming a bent portion on a side surface, a pad portion supported by a spring and disposed adjacent to the lower die in the horizontal direction, being movable upward and downward, an upper die disposed opposing the pad portion in the vertical direction, and a regulation portion. When the upper die moves downward and presses a steel plate between the upper die and the pad portion to form a bent portion in an edge portion of the steel plate, the regulation portion moves together with the upper die and regulates the motion of the edge portion of the steel plate protruding from the lower die in the horizontal direction, thereby preventing a wrinkle from forming in the edge portion of the steel plate.

Description

CROSS-REFERENCE OF THE INVENTION[0001]This application claims priority from Japanese Patent Application No. 2014-016719, filed on Jan. 31, 2014, the content of which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a press machine and a pressing method for forming a bent portion in an edge portion of a steel plate.[0004]2. Description of the Related Art[0005]For vehicle components, a thinned and high-strength member is used so as to enhance both the safety and economy. For this purpose, so-called hot press is known in which a steel plate heated to high temperature is quenched by cooling the plate with low-temperature press dies. In this method, a steel plate is heated to an austenitizing temperature or higher, and the steel plate is formed and rapidly cooled with a press machine simultaneously, completing quenching.[0006]A certain kind of vehicle component has a bent portion (step portion) wi...

Claims

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Application Information

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IPC IPC(8): B21D5/02B21D53/88B21D37/16
CPCB21D5/0236B21D53/88B21D37/16B21D5/0281B21D22/208B21D22/24
Inventor IWANUMA, TADASHIHAYASHI, KOJI
Owner TOA IND CO LTD
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