Piston Pin Bush

The castings are then placed into a heat treatment plant (with specified temperature & duration) for tempering, which ensures an improved quality. Required hardness is achieved and pre-formed stresses are relieved through ageing process.The machining cycle begins with various operations being performed in stages on fully & semi-automatic CNC machines and other Special Purpose Machines (SPM), to achieve the required shape and finish. Each machining cycle is done in modular assembly line (cell type) for an even greater concentration of quality & supply.Subsequently, Semi-Auto boring along with cutting of groove for Circlips and Gudgeon pin bore is done on a six-station semi-auto bore machine. Burnishing of the pin bore is also done (by a diamond tool) for accurate grooving and a smooth finish.Ring grooves are then cut with the help of solid carbide and Poly crystalline tools for fine cut and accuracy in micron tolerances. Holes are drilled within the grooves for burr free oil holes for lubrication purpose. Facility is provided for horizontal and cross hole drilling.