Fish & Richardson P.C.
Manufacturing method of plastically formed product
 The manufacturing method of plastically formed products prevents the generation of cracks at the time of plastic working, thereby increasing the productivity. It is also prevented that the metallic particles constituting the product become large and rough in structure. In the manufacturing method, only the compact treatment and the vacuum deaeration treatment are carried out prior to the extrusion treatment, without the pressure-heat treatment performed. Therefore, processing steps prior to the extrusion treatment are simplified, so that the productivity of the plastically formed products is improved and the metallic particles are prevented from being large and rough. The diffusion treatment between the extrusion treatment and the forging treatment enhances the adhesion at the inner part of the extruded material in the radial direction, whereby the generation of cracks at the time of plastic working is avoided. 
Mazda Motor Corporation
B Y B B Y
B22F Y02W B21C B22F Y02P
inventional additional inventional inventional additional
Makoto Shoji Nobuo Yukio
Fujita Hirabara Sakate Yamamoto