METHOD OF MAKING DISC WHEELS FOR TRANSPORT VEHICLES Russian patent published in 1995 - IPC

FIELD: metal pressure forming. SUBSTANCE: method comprises steps of heating blank, multistage forging of it, rolling out its rim, punching holes in a disc and working the blank. The multistage forging of the blank in the form of a cylinder, having a diameter more, than a diameter of the disc, but less, than a mounting diameter of the wheel, is being performed in a mode of hot deformation of aluminium alloys for making a cylindrical semifinished product with a bottom and an inlet portion, whose outer diameter is less, than an outer diameter of the cylinder. A thickness of its wall. A direct extrusion of the cylindrical semifinished product is being performed at temperature of semihot deformation of aluminium alloys for making a thin-wall sleeve, having a height being more, than a width of the rim of the wheel The thin-wall sleeve is then being heated up a temperature of its semihot deformation for cone spreading of portions of the thin-wall sleeve, adjacent to its ends, with simultaneous deformation of the bottom of the sleeve for making a necessary profile of the disc of the wheel. The cone spreading operation of the portions of the thin-wall sleeve, adjacent to its ends, is being performed by two stages, and then walls of the thin wall sleeve are being rolled out for making a profile of the rim. A next operation being a quenching with subsequent artificial aging of the forged and rolled out semifinished product of the wheel. Then ends of the wheel rim are being worked. EFFECT: enhanced quality of wheels. 1 cl, 2 dwg