METHOD FOR MAKING SEMI-FINISHED PRODUCT OF TRANSPORT VEHICLE WHEEL, FOR EXAMPLE FRAGMENT OF BUILT-UP WHEEL Russian patent published in 2008 - IPC B21K1/28 

FIELD: plastic working of metals, possibly in forging shops of metallurgical and machine engineering plants for making wheels of transport vehicles or similar products.

SUBSTANCE: method comprises steps of forming by hot die forging of one-piece semi-finished product having boss with opening, rim with flange and disc joining rim and boss. Semi-finished product is formed by two stages (preliminary and final ones). At preliminary step cup with bottom and inclined wall coupled with bottom in zone of its minimum diameter size is formed. Said cup features next relation of sizes: S = (1.2 - 3.5)h where S - thickness of cup wall near its end; h - thickness of cup bottom in its central portion. At final step semi-finished product is imparted to its final contour and its central portion is separated while opening of boss is formed.

EFFECT: improved quality, lowered mass of ready products.

2 dwg, 2 ex