Method for manufacturing hot-forged member

Abstract

Provided is a method for manufacturing a hot-forged member, the method enabling efficient hot forging while preventing defects such as cracks even when a poor workability alloy is used as a material to be hot forged. A method for manufacturing a hot-forged member, comprising: a heating step of heating an unheated material for hot forging in a furnace to a hot forging temperature; a heat-resistant insulation material bonding step of bonding a heat-resistant insulation material to at least a part of a surface of a material for forging removed from the furnace to obtain a material to be hot forged; and a hot forging step of compression-forming a part or all of the material to be hot forged into a predetermined shape using any of a die, an anvil, and a tool, the method further comprising a glass lubricant coating step of coating a glass lubricant on at least a portion of a surface of the unheated material to which the heat-resistant insulation material is to be bonded, wherein the glass lubricant has a viscosity of 10 2 to 10 7 Pa·s in the heat-resistant insulation material bonding step.

1 . A method for manufacturing a hot-forged member, comprising:
 a heating step of heating an unheated material for hot forging in a furnace to a hot forging temperature;   a heat-resistant insulation material bonding step of bonding a heat-resistant insulation material to at least a part of a surface of a material for forging removed from the furnace to obtain a material to be hot forged; and   a hot forging step of compression-forming a part or all of the material to be hot forged into a predetermined shape using any of a die, an anvil, and a tool, the method further comprising:   a glass lubricant coating step of coating a glass lubricant on at least a portion of a surface of the unheated material to which the heat-resistant insulation material is to be bonded,   wherein the glass lubricant has a viscosity of 10 2  to 10 7  Pa·s in the heat-resistant insulation material bonding step.   
     
     
         2 . The method for manufacturing a hot-forged member according to  claim 1 , wherein the hot forging step is open-die forging, and the heat-resistant insulation material is bonded to at least a part of a surface of a free deformation portion of the material for forging that is not in contact with any of the die, anvil, or tool in the open-die forging. 
     
     
         3 . The method for manufacturing a hot-forged member according to  claim 1 , wherein glass particles are adhered to a surface of the heat-resistant insulation material to which the material for forging is to be bonded. 
     
     
         4 . The method for manufacturing a hot-forged member according to  claim 1 , wherein the heat-resistant insulation material is an inorganic fiber.