Claims
- 1. A process for forming an initial section having a hollow interior to a final shape by means of high internal pressure in the sealed hollow interior using a flowable medium, the process comprising the steps of:preshaping wall sections adjacent to a corner region of the initial section in a curved manner—as viewed in cross-section—counter to a direction of applied pressure in order to shape-form the initial section; and subsequently reshaping the wall sections by applying the high internal pressure of the flowable medium and displacing the corner region in a direction in which the pressure is applied so that first the corner region of the initial section is pushed against a contour of a wall of a shape-giving space, and subsequently, by increasing pressure, the section walls are pushed against the wall of the shape-giving space and plastically deformed.
- 2. A process according to claim 1, including, for forming an initial section featuring at least two corner regions, preshaping wall lengths running between the corner regions in a curved manner—as viewed in cross-section—counter to the direction of applied pressure, and subsequently reshaping the wall sections by applying the high internal pressure of the flowable medium and displacing the corner regions in the direction in which the pressure is applied.
- 3. A process according to claim 1, wherein a corner angle of the corner region is about 90°.
- 4. A process according to claim 1, wherein a corner angle of the corner region is less than 90°.
- 5. A process according to claim 4, wherein the corner region forms a peak.
- 6. A process according to claim 1, further including performing a displacement of the corner region in a direction of a middle line of the corner region.
- 7. A process according to claim 1, including creating a local degree of deformation of the initial section as oversizing with respect to a final contour of a final section by means of a dome-like, inwardly pointing curvature of the section cross-section.
- 8. A process according to claim 7, including creating compression, by HIPF-forming, toward a periphery of the section and thereby inducing compressive internal stresses.
- 9. A process according to claim 1, including creating a local degree of deformation of the initial section as undersizing with respect to a final contour of a final section.
- 10. A process according to claim 9, including stretching, during HIPF-forming, the section material toward a periphery of the section thereby inducing tensile internal stresses.
- 11. A process according to claim 1, wherein the corner region in the initial section is thickened.
- 12. A process according to claim 11, including shaping the wall section in the regions adjacent to the corner region with a cross-section that curves inwards.
- 13. A process according to claim 12, including shaping the wall section in the regions adjacent to the corner regions with a cross-section that curves inwards relative to a final cross-section.
- 14. A process according to claim 1, including shaping the section wall of the initial section at least with one region which is curved in cross-section as part of a circle or part of an ellipse.
- 15. A process according to claim 1, including shaping the section wall of the initial section at least with one region which, in cross-section, is curved as a parabola, hyperbola-like or similar shape.
Priority Claims (1)
Number |
Date |
Country |
Kind |
199 36 501 |
Aug 1999 |
DE |
|
PRIORITY CLAIM
This is a U.S. national stage of application No. PCT/CH00/00401, filed on Jul. 21, 2000. Priority is claimed on that application and on the following applications:
Country: Germany, Application No.: 199 36 501.6, Filed: Aug. 5, 1999; and
Country: Germany, Application No.: 199 46 011.6, Filed: Sep. 25, 1999.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/CH00/00401 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO01/10580 |
2/15/2001 |
WO |
A |
US Referenced Citations (4)
Foreign Referenced Citations (4)
Number |
Date |
Country |
34 32 499 |
Nov 1986 |
DE |
42 14 557 |
Nov 1993 |
DE |
198 03 738 |
Aug 1999 |
DE |
198 13 012 |
Oct 1999 |
DE |