JPS5550938A - Forging method - Google Patents

Abstract

PURPOSE: To ease the unevenness of strain distribution in the work produced at the forging and obtain the homogeneous forging by screwing down the anvil little by little in the specified strain quantity unit and letting the anvil retreat in the direction opposite from that at the screwing-down after the respective screwing-downs.

CONSTITUTION: At the time of screwing-down of the anvil, it is screwed down little by little in the unit of strain quantity 1.0% or under and the anvil is retreated in the direction opposite from that at the screwing-down after the respective screwing-downs, whereby forging is accomplished. Here, the retreat quantity of the anvil necessitates securing the elastic strain recovery quantity of the work after the screw- down and this quantity has differences depending upon the characteristics of the work. The pattern thereof under ideal discontinuity is as illustrated, wherein the retreat quantity dl of the anvil may be indicated by formula dl≥A/100.l. Here, the elastic recovery quantity of steel at hot forging temperature is generally considered about 3% and 3 is given for A in the above formula.

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