摘要:
In a method of forming an integral fastener such as a rivet on a sheet metal component (15) such as part of a clutch plate assembly, the metal sheet is placed between a pair of dies (1, 2) the die (1) having a cavity (3) and the die (2) carrying a plunger (4) co-operating with clearance with the cavity and biased by a spring (7). The die (2) has an annular working face (14) surrounding the plunger (4). As the dies are brought together the plunger first applies a bias force to the portion of the sheet in register with the cavity (3) and then the face (14) acts to compress an annular zone of the sheet surrounding the cavity. The combined effect of the bias force and the compression then causes material to yield in the annular zone and to be displaced from that zone to flow into the die cavity to form a hollow fastener in the clearance between the cavity and the plunger.
摘要:
57 A friction component (1) for a clutch or brake including a facing (6) of friction material and at least one metal section (7) of plate-like form embedded in a rear surface (8) of that facing (6) and having an integral rivet (4) or other fastener projecting outwardly from the facing rear surface (8). The metal section (7) extends across a relatively small part of the facing rear surface (8) and if there is a plurality of such sections (7) they may be interconnected through integral bands (9). In the case of an annular friction component the metal sections (7) are spaced circumferentially around the friction facing (6) and the connecting bands (9) are preferably adjacent the inner periphery (12) of the facing (6).