Method of manufacturing a tubular structural part, and tubular structural part

摘要

In a method of making a tubular structural part for a motor vehicle, a metal plate is contoured and preformed in at least one shaping step into a tubular body. Subsequently, the tubular body is end-formed into the structural part by internal high-pressure application while free contact regions snugly bear upon one another. The structural part is at least partially heated and quenched in a holding tool acted upon with a coolant.

主权项

1. A method of making a tubular structural part for a motor vehicle, comprising the steps in the order of:
trimming a metal plate about its circumference; forming the metal plate into a tubular body with edge-side contact regions snugly bearing upon one another; heating the tubular body to a temperature above the AC3 temperature point; end-forming the tubular body into a structural part in the absence of any preceding joining process using internal high-pressure application in an internal high-pressure tool while the contact regions are tightly compressed upon one another during the internal high-pressure forming process by a pressing force acting upon the contact regions; and cooling the tubular body in the tool during internal high-pressure forming process to thereby harden the tubular body.