Carburizing and quenching control device and carburization quenching method

摘要

PROBLEM TO BE SOLVED: To suppress warping strain generated on a gearwheel after hardening, without increasing cost of the gearwheel.SOLUTION: Hardening is performed by immersing a gearwheel 100 which has been subjected to carburization processing to a cooling medium 300, in a state in which a bottom face 102 of the gearwheel 100 is the cooling medium 300 side, and movement of the gearwheel 100 along a rotary shaft (a thickness direction) is not restricted. At the time, based on a relational expression of immersion speed Vand warping strain δ obtained by a result of numeric value analysis, and shape parameters G, G, and w, immersion speed Vin which the warping strain δ becomes 0 (zero) is predicted, and control is performed so that the immersion speed Vof the gearwheel 100 is kept to the predicted immersion speed V.SELECTED DRAWING: Figure 1