Patent ID: 9573179
Date: 2017-02-21
CPC Classifications: B21B,B21D

Claim:
1. A device for manufacturing a metal wheel from a pre-form, the device comprising: stretching rolls engaging a rim region at a radially outer side of the pre-form, and said stretching rolls being displaceable radially against said outer side of the pre-form in an axially outer region of said pre-form and said stretching rolls being movable on said radially outer side of the pre-form axially along a circumferential wall of the pre-form for radial compression and axial stretching of the circumferential wall of the pre-form, wherein said stretching rolls form a rim of the metal wheel, the pre-form being rotationally symmetrical, said circumferential wall of the pre-form extending axially only along a part of the metal wheel after finishing the metal wheel, said circumferential wall having an axial inner region, said axial inner region extending radially beyond a final contour of the metal wheel after finishing the metal wheel, said stretching rolls exerting a radial force on said circumferential wall and radially compressing said circumferential wall, wherein an end of the metal wheel is formed via at least said stretching rolls stretching said circumferential wall; and freely rotating rolls for creating an inner rim flange, said freely rotating rolls being arranged underneath the stretching rolls, wherein a jacket wall of the freely rotating rolls provide abutments from underneath for the pre-form and the stretching rolls cooperate with the freely rotating rolls for forming the inner rim flange by stretching of pre-form material against the freely rotating rolls, said freely rotating rolls being arranged under an axially inner end of the pre-form.