Method for manufacturing hot-forged member

Patent metadata

Field	Value
Publication number	US-12290853-B2
Application number	US-202117904697-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 13, 2020
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

A method for manufacturing a hot-forged member includes heating an unheated material for hot forging in a furnace to a hot forging temperature; 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 compressing 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.

First claim

The invention claimed is:

1. A method for manufacturing a hot-forged member, comprising:
heating an unheated material for hot forging in a furnace to a hot forging temperature to obtain a material for forging;
bonding a heat-resistant insulation material to at least a part of a surface of the material for forging to obtain a material to be hot forged, wherein the heat-resistant insulation material is a glass fiber or a ceramic fiber, and wherein glass particles are adhered to a surface of the heat-resistant insulation material to which the material for forging is to be bonded, by sprinkling the glass particles on the surface of the heat-resistant insulation material, or by applying or spraying a glass lubricant containing the glass particles on the surface of the heat-resistant insulation material and then drying the heat-resistant insulation material to which the glass particles are adhered; and
hot forging a part or an entirety of the material to be hot forged without reheating it into a predetermined shape using any of a die, an anvil, and a tool,
wherein the unheated material is composed of a Ni-based heat-resistant superalloy which contains Cr in a range of 10 to 35% by mass, and
an oxygen concentration in the furnace is controlled to be 10% or less during the heating 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 , further comprising 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.

Assignees

• Proterial Ltd

Inventors

• Yamashita Yoji
• Aoki Chuya
• Kobayashi Shinichi

Classifications

• B21J5/00

  Methods for forging, hammering, or pressing (for working sheet-metal or metal tubes, rods, or profiles B21D; for working wire B21F); Special equipment or accessories therefor · CPC title

• B21J1/06 Primary

  Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations {(B21J5/063 takes precedence)} · CPC title

• B21J1/02

  Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough (modifying the physical properties by deformation C21D7/00, C22F1/00) · CPC title

• B21J5/022

  Open die forging · CPC title

• B21J1/04

  Shaping in the rough solely by forging or pressing · CPC title