Sughrue, Mion, Zinn, Macpeak & Seas
Camshaft composition
 A camshaft having a tubular steel shaft and a sintered cam piece joined to the shaft. The sintered cam piece has iron tetroxide film at its surface. The camshaft is produced by assembling a powder compact to the steel shaft to provide a camshaft assembly, sintering the assembly to provide an integral assembly, correcting bending to the assembly, annealing the assembly, grinding the cam piece and effecting vaporization treatment to the assembly at a temperature lower than the annealing temperature. 
Nippon Piston Ring Co., Ltd.
Y C F B C B Y F F F
Y10T C22C F01L B22F C22C B22F Y10T F16H F01L F01L
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Shunsuke Yasuo
Takeguchi Suzuki