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Indirect electrohydraulic press forming tool, device and method

A technology of stretch forming and tooling, which is applied in the direction of manufacturing tools, presses, stamping machines, etc., can solve the problems that the workpiece is not allowed to be actually formed, and the punch assembly is not allowed to be moved, so as to achieve simplified radius and improved local elongation , the effect of exquisite details

Inactive Publication Date: 2019-06-04
ADM28 S AR L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution does not allow moving the punch assembly over the workpiece at high speeds, which does not allow actual forming of the workpiece, and limits its application to reducing springback

Method used

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  • Indirect electrohydraulic press forming tool, device and method
  • Indirect electrohydraulic press forming tool, device and method
  • Indirect electrohydraulic press forming tool, device and method

Examples

Experimental program
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Embodiment Construction

[0050] Figure 1A and Figure 1B An apparatus for indirect electrohydraulic stretch forming according to a first embodiment is shown. The device 100 for indirect electro-hydraulic stretch forming includes a tool 110 , a die 120 and a blank holder 140 . A material blank 130 to be formed, here a metal sheet, is held between the blank holder 140 and the die 120 . Binders are used to control the stretching of the blank during indirect electrohydraulic forming. The force of the blankholder is controlled to avoid wrinkles in the workpiece while at the same time enabling it to draw the material into the die, thus limiting the elongation of the material which could lead to fracture. In this embodiment, the tool 110 is above the die 120 and the blank 130 of material to be formed. The tool 110 includes a male die 111 having a general shape complementary to that of the female die 120 so that the male die 111 is inserted into the female die 120 while accommodating the thickness of the ...

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PUM

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Abstract

An indirect electrohydraulic press forming tool (110; 210) comprising: - a body (113; 213) comprising a tubular cylindrical zone (113a; 213a), - a chamber (115; 215) intended to be filled with a liquid, - two electrodes (116a, 116b; 216a, 216b), each of the electrodes having a portion arranged in the chamber (115; 215), - a punch (111; 211). The tool also comprises: - a piston (114; 214) mounted sliding in a sealed manner in the cylindrical zone and delimiting the chamber (115; 215) in a sealed manner. Moreover, the punch (111; 211) is carried by the piston (114; 214) on a face of the latter opposite the chamber (114b; 214a).

Description

technical field [0001] The present invention relates to tools, devices and methods for indirect electrohydraulic stretch forming of materials. Background technique [0002] Drawing is one of the most commonly used methods for forming materials, especially sheet metal workpieces, such as automotive body parts. The method includes holding a blank of material by a blankholder by its edge and deforming the free portion of the blank of material by applying a punch called a forming tool in a die which, in addition to accommodating the thickness of the sheet Respectively have a profile approximately the same as the expected shape of the workpiece to be obtained. To this end, the punch is applied with a predetermined force on the material blank to be deformed. When applied stress exceeds the yield strength of the material to be deformed, the material blank undergoes permanent plastic deformation. However, when the applied stress is released, that portion of the stress absorbed by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/12B30B1/00B21D22/02
CPCB21D22/02B21D28/007B30B1/001B30B1/005B21D26/12
Inventor 吉莱斯·阿弗里劳德埃里克·曼代尔
Owner ADM28 S AR L
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