PRODUCTION OF FERROUS SINTERED PARTS

PROBLEM TO BE SOLVED: To obtain parts in a complicated shape excellent in dimensional precision and strength by subjecting a powdery sintered body using powder essentially consisting of iron as the raw material to quenching and thereafter working the sintered body by using a die in a state of being heated in a specified temp. range. SOLUTION: A powdery sintered body using powder essentially consisting of iron as the raw material is quenched to make its strength high, thereafter, this sintered body is worked by using a die in a state of being heated at 100 to 550 deg.C. In this way, the warm deformation resistance of the material can be reduced without deteriorating the characteristics of the material after cooling. When the sintered body is recompressed by a die heated at a room temp. to 550 deg.C while the temp. is as it is, since its deformation, resistance is low, the dimensional modification thereof can easily be executed. Moreover, after it is drawn out from the die, air cooling is executed, by which sintered parts having a structure obtd. by refining the quenched structure and excellent in dimensional precision can be obtd. Furthermore, since induction hardening is not required and only the execution of ordinary quenching is enough, batch treatment is made possible.