Quenching method and restraint quenching device

Abstract

A quenching method is provided for workpieces including respective laces and having respective workpiece through-holes. A quenching method includes: a step of preparing a press quenching device capable of switching between a restraint state in which workpieces are restrained and an unrestraint state in which the workpieces are not restrained; a step of arranging a plurality of heated workpieces in a press quenching device that is in the unrestraint state; a step of restraining the restraint target areas of the workpieces by the press quenching device by causing the press quenching device to switch from the unrestraint state to the restraint state; and a step of cooling the restrained workpieces.

1 . A quenching method for quenching target objects which have respective disc-shaped areas and are provided with respective through-holes, the method comprising:
 a step of preparing a restraint quenching device capable of switching between a restraint state in which the quenching target objects are restrained and an unrestraint state in which the quenching target objects are not restrained;   a step of arranging a plurality of the heated quenching target objects in the restraint quenching device that is in the unrestraint state;   a step of restraining restraint target areas of the quenching target objects by the restraint quenching device by causing the restraint quenching device to switch from the unrestraint state to the restraint state; and   a step of cooling the restrained quenching target object.   
     
     
         2 . The quenching method according to  claim 1 , further comprising a step of immersing the plurality of heated quenching target objects in a coolant before the step of the restraining,
 wherein the step of the restraining and the step of the cooling are performed in a state in which the quenching target objects are immersed in the coolant.   
     
     
         3 . The quenching method according to  claim 2 , wherein the step of the arranging includes
 a step of arranging the plurality of quenching target objects on a positioning member of the restraint quenching device, and   a step of arranging a plurality of restraint members of the restraint quenching device individually between the plurality of the quenching target objects.   
     
     
         4 . The quenching method according to  claim 3 , wherein, in the step of the arranging, the plurality of quenching target objects are arranged on the positioning member along axial lines of the through-holes of the quenching target objects. 
     
     
         5 . The quenching method according to  claim 4 , wherein, in the step of the restraining, a first restraint member of the restraint members is abutted on, as any one of the restraint target areas, a principal surface in any one of the disc-shaped areas of the quenching target objects, and a second restraint member is abutted on a back surface in any one of the disc-shaped areas. 
     
     
         6 . The quenching method according to  claim 1 , further comprising a step of immersing the quenching target objects arranged in the restraint quenching device in a coolant after the step of the restraining,
 wherein the step of the restraining is performed in a state in which the quenching target objects are not immersed in the coolant,   the step of the cooling has a first period in which the cooling is performed in the state in which the quenching target objects are not immersed in the coolant, and   the step of the cooling has, following the first period, a second period in which the cooling is performed in a state in which the quenching target objects are immersed in the coolant.   
     
     
         7 . The quenching method according to  claim 1 , wherein the step of the restraining and the step of the cooling are performed in a state in which the quenching target objects are not immersed in a coolant. 
     
     
         8 . A restraint quenching device provided for quenching target objects which have respective disc-shaped areas and are provided with respective through-holes, the restraint quenching device comprising:
 a positioning member configured to maintain positions and postures of a plurality of the quenching target objects;   a plurality of restraint members capable of coming into contact with restraint target areas of the quenching target objects; and   a push mechanism configured to push the restraint members toward the restraint target areas,   wherein the restraint members and the push mechanism switch between a restraint state in which the quenching target objects are restrained and an unrestraint state in which the quenching target objects are not restrained.