RIVETS (CLUTCH FACING/BRAKE LININGS)
A rivet is unthreaded, headed pin used to join two parts by passing the pin through holes in the parts and then forming a second head in the pin on the opposite side. Rivets are widely used for achieving a permanent mechanically fastened joint. Connection between metal parts are required in most applications, and are a critical part of every design. Rivets require that holes be made to receive them, which reduces that net cross section, and these holes must be very accurately aligned. In a riveted connection, joining permanently two plate-like members or rolled shape flanges. The connection may be subjected to tension tending to pull the members aparts or to shear the members either axially or transversely. The connection may also resist moments, perhaps created by eccentric loads. Torsional, twisting or tearing forces may also be applied. It is essential to determine the forces that act on a connection, both under normal loads and in extraordinary circumstances. A rivet comes as a circular steel rod with a forged head, the manufactured head, on one end. For use, it is placed red-hot into a hole conventionally 1/16Â greater in diameter. The length of a rivet is the distance from the underside of the head to the end of the fresh rivet. The thickness of the material to be joined is the called the grip of the rivet. The length of the rivet to be used for a certain grip is given in tables. The rivet is then set by forging a field head onto it. Rivets can be used in any orientation; enough clearance must exist to set them properly. A riveted joint is quickly made, and is easy to inspect. For the connection of relatively thin members in steel construction, rivets were traditionally used. Such connections proved very reliable, giving excellent service. The overall fasteners market is estimated at about Rs. 28 bn. while the organized sector has a share of 65%, the balance of 35% is shared by unorganized sector and imports. The imports in 2006-07 were Rs. 8 bn, leaving Rs. 2 bn or 7% as the market for the unorganized sector in value terms. The market is heavily dependent on imports which have been growing at close to 28.5% in recent period. There is good future prospect for this industry. Few Indian Major Players are as under: Agarwal Bolts Ltd. G K W Ltd. Indian Steel & Wire Products Ltd. Precision Gears Ltd.