Search Results

A new technologies for manufacturing of engine valve seats have been developed. This process, different from the conventional method that valve seats made of sintered alloy were press-fit into the cylinder head, is directly formed valve seats onto cylinder head by using the laser cladding technique. In order to develope the cylinder head with laser cladding valve seats, the laser cladding technology by which copper based alloy is deposited onto aluminum alloy with little dilution and stable bead has been established. And the unique cladding alloy, which is two phases in the liquid stage and in which iron or molybdenum rich hard particles are dispersed in the solid state, has been developed. Based on this technique, the practical process has been successfully completed.

The application of laser cladding process for engine valve-face coating is discussed. It was found that the high quality and cost saving engine valves could be obtained by thinning the coating layer and controlling the ranges of base metal dillution from 5 to 15%. And, after some efficiency tests, it became clear that the laser cladded engine valves had the same anti-wear property as the oxy-acetylen gas welded engine valves.