| 摘要 |
<p>The semifinished casting for an alloy road wheel (1) undergoes three successive machining operations in which material is removed by stages to produce an inner circumferential seating (7), destined to accommodate one bead (14) of a pneumatic tyre (13), a centre hole (10) coaxial both with the inner seating and with the axis of rotation (15) of the wheel, also a set of fixing holes (11) of which the axes describe a circle (12) centred on the axis of rotation, and finally, an outer circumferential seating (6) destined to accommodate the remaining bead (14) of the tyre (13), which is offset from the axis of rotation (15) in such a manner as to achieve a non-uniform distribution of mass, limited essentially to the part of the wheel (1) affording the outer circumferential seating (6), that varies progressively with the change in angular position around the axis of rotation (15) between a maximum and a minimum value. <IMAGE></p> |
