Internal High-Pressure Shaping Device

Abstract

The invention relates to a device (10) for the internal high pressure forming of a hollow profile (5), comprising a forming tool and a sealing arrangement for holding and sealing an end (12) of the hollow profile (5), this end (12) projecting from the impression (16) of the forming tool, the sealing arrangement (11) having a section (6), plunging into the hollow profile (5), of an axial punch (4) and at least one clamping jaw (3) which, when the section (6) of the axial punch (4) has plunged in, presses radially from outside on the hollow profile end (12) in such a way that the clamping jaw (3) fixes the latter in position. It is essential to the invention in this case that an actuator (14) is provided which drives the clamping jaw (3) for displacing it only radially to the hollow profile axis.

Description

BACKGROUND AND SUMMARY OF THE INVENTION [0001] The present invention relates to a device for internal high pressure forming. [0002] A method and a device for the internal high pressure forming of a hollow profile closed at the periphery form the subject matter of a German Patent Application, still not published at the time of the present application, having the official reference 103 49 699.8 and dated Oct. 24, 2003. The known device has an internal high pressure forming tool with a sealing arrangement which contains an axial punch having a section plunging into the hollow profile for holding and sealing an end of the hollow profile, this end projecting from the impression of the forming tool. Furthermore, a unit for generating a high fluid pressure is provided for expanding the hollow profile by means of fluidic internal high pressure. Owing to the fact that an outside diameter of the axial punch on the plunging section is equal to or falls slightly below the inside diameter of the...

AI Technical Summary

Benefits of technology

[0007] By means of internal high pressure, the contour of the exhaust pipe is adapted in a simple manner to the bearing contour of the lateral surface of the holder at the location at which the future bearing surface of the holder is provided. The connection of the lateral surface of the holder to the exhaust pipe saves construction space. The holder, at this location, is virtually sunk into the exhaust pipe, but at least into the pipe wall.

[0018] The die parts can expediently be displaced while the clamping jaw fixes the hollow profile end. This results in a method advantage, since the die parts must first be displaced onto the hollow profile blank directly before the internal high pressure forming and thus premature damage to the surface of the hollow profile blank caused by a bearing surface of the cavity block can be avoided. At the same time, this prevents the end of the hollow profile blank from being drawn in as a result of preprofiling for the case where the hollow profile blank, from the closing movement of the forming tool, is to be compressed and thus preprofiled.

Problems solved by technology

The result of the enclosing of the sealing ring is therefore that the elastic material cannot give way laterally.

The connection of the lateral surface of the holder to the exhaust pipe saves construction space.

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