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Pre-crush die assembly and method

a technology of pre-crush die and assembly method, which is applied in the direction of metal-working tools, manufacturing tools, shaping tools, etc., can solve the problems of tubular member wall weakening and rupturing

Inactive Publication Date: 2006-06-15
ACCURATE MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] In yet another embodiment, the pre-crush die further comprises at least one drive coupler mechanically coupling the first and second rails whereby the first and second dies are further maintained equidistant from the centerline of the tubular member adjacent the portion of the tubular member to be deformed during interdependent movement of the first and second dies and first and second rails. The drive coupler in effect improves the tolerance of accuracy in the interdependent movement of the first and second dies.

Problems solved by technology

One problem associated with hydroforming is known as pinching.
This pinching may result in the walls of the tubular member weakening and being subject to rupturing during the hydroforming process.

Method used

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Examples

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Embodiment Construction

[0027] The present invention relates to a pre-crush die assembly for controlled deformation of a tubular member, such as, for example, a pipe or conduit having a circular or non-circular cross-section, to be used in a subsequent hydroforming operation.

[0028] Referring to FIGS. 1A and 1B there is shown a schematic view of the pre-crush die sub-assembly 10. The sub-assembly 10 comprises a first die 12 and a second die 14. The dies 12 and 14 are carried by carriages 16 and 18 respectively. Each of the dies 12 and 14 has a corresponding hydraulic cylinder 20 and 22 coupled to it. The hydraulic cylinders 20 and 22 each have a cylinder portion 24 and a piston portion 26 and are run by a hydraulic power pack (not shown). The piston portion 26 is coupled to the corresponding die 12, 14. The cylinders 24 of each of the hydraulic cylinder is 20, 22 is connected to a corresponding carriage 16, 18. In this manner, a closed loop sub-assembly 10 is provided. In the open position shown in FIG. 1B...

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Abstract

A pre-crush die assembly is utilized for controlled deforming of at least a portion of one or more tubular members to be used in a subsequent hydroforming operation. The tubular member has a centerline extending therethrough. The die assembly comprises at least two dies that move interdependently towards each other to deform the tubular member on opposite sides thereof equally about the centerline of the tubular member where the tubular member is being pre-crushed.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a pre-crush die assembly for controlled deformation of a tubular member, such as, for example, a pipe or conduit having a circular or non-circular cross-section, to be used in a subsequent hydroforming operation. [0002] Hydroforming is the known process of shaping usually a hollow tubular metallic member within a closed mold by subjecting the hollow metallic member to high internal fluid pressure. The high internal fluid pressure permanently deforms the metallic member against the mold surfaces of the closed mold. Hydroforming is used on a large scale for manufacture of frame components for road vehicles and finds application in other manufacturing and industrial processes where a tubular product is formed to very precise dimensions. [0003] One problem associated with hydroforming is known as pinching. Pinching occurs when the outside walls of the tubular member are scraped and deformed during insertion of the tubul...

Claims

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Application Information

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IPC IPC(8): B21D37/12B21D26/033
CPCB21D11/18B21D26/033
Inventor OXLEY, DAVIDJOJART, IOSIFPICINIC, ROBERTOBRADOVIC, LJUBISA
Owner ACCURATE MOLD