Method for Internal High-Pressure Deformation of a Blank

a high-pressure deformation and blank technology, applied in the direction of manufacturing tools, metal-working apparatus, shaping tools, etc., can solve the problems of residual fluid remaining, adverse effect of subsequent deformation process, residual fluid collecting in the receiving space, etc., and achieves low viscosity lubricant and easy removal

Inactive Publication Date: 2007-09-13
DAIMLER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0013] In the abovementioned methods, it may be advantageous to use a low-viscosity lubricant, since, compared to high-viscosity lubricants, a low-viscosity lubricant is easier to remove from the receiving space of a die.
[0014] As has already been explained above, the residual fluid substantially comprises high-pressure flu...

Problems solved by technology

One problem with the hydroforming apparatuses which are known from the prior art is that, following the actual deformation operation, residual fluid collects in the receiving space.
After the blank has been removed from the die, the residual fluid remains in the receiving space and may have an adverse effect on a subsequent deformation process.
On the one hand, the residual fluid enclosed in the receiving space is substantia...

Method used

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  • Method for Internal High-Pressure Deformation of a Blank

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Embodiment Construction

[0023] The apparatus, which is denoted overall by reference numeral 2 in FIG. 1, has an upper die half 4 and a lower die half 6. The die halves 4 and 6 delimit a receiving space 8, the wall 10 of which corresponds to the external geometry of a shaped part which is to be produced.

[0024] An as yet undeformed, tubular blank 12 has been inserted into the receiving space 8, the outer skin 14 of which blank 12 comes to bear against the wall 10 of the receiving space 8 during the deformation process. The blank 12 may be laterally sealed with the aid of axial cylinders 16 and 18, the axial cylinder 18 having a line 20 for a high-pressure fluid supply (not shown). High-pressure fluid can be introduced into the cavity of the blank 12 through the line 20, so that the blank 12 can be deformed.

[0025] The lower die half 6 has three passages 22, 24 and 26 opening out in the receiving space 10. These passages are connected to a manifold 28. Accordingly, the upper die half 4 has passages 30, 32 an...

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Abstract

The invention relates to an apparatus for the hydroforming of a blank with the aid of a high-pressure fluid, having a die which has a receiving space for a blank, wherein the die has at least one passage which opens out in the receiving space and through which residual fluid located in the receiving space can be transported out of the receiving space. The invention also relates to methods for operating an apparatus for the hydroforming of a blank.

Description

BACKGROUND AND SUMMARY OF THE INVENTION [0001] This invention relates to a method for operating an apparatus for hydroforming a blank. [0002] Hydroforming is becoming increasingly important in the automotive industry in order to allow the production of body components. First of all, undeformed blanks, for example tubes, are inserted into the receiving space of a die. The geometry of a receiving space corresponds to the desired external geometry of the finished component. The blank is acted on by high-pressure fluid so that the walls of the blank are plastically deformed and come to bear against the walls of the receiving space. It is in this way possible to economically produce high-strength, complex components. [0003] To assist the deformation process and to minimize friction which occurs between the wall of the receiving space and the outer skin of the blank, it is known from European document EP 0 771 598 A1 to supply the receiving space with lubricant. The lubricant has the effe...

Claims

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Application Information

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IPC IPC(8): B21D26/02B21D26/047B21D37/18
CPCB21D37/00B21D26/047
Inventor KOELLN, JOERGSCHULT, JENS
Owner DAIMLER AG
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