Hot Forging Coating and Insulation for Crack-Prone Alloys
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Solution Overview
Problem
Existing methods for hot forging of alloys with poor workability, such as Ni-base alloys and Ti alloys containing a γ′ phase, face challenges in maintaining hot workability and preventing defects like cracks due to temperature drops during the hot forging process.
Innovation Solution
A method involving a heating step to reach the hot forging temperature, a heat-resistant insulation material bonding step to minimize temperature drops, and a glass lubricant coating step to enhance bonding and heat retention, allowing for efficient hot forging while preventing cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If glass woven fabric is used to wrap the material for hot forging, then temperature drop is prevented, but heating time increases due to heat insulation effect
Solution Approach 1:
The glass lubricant is coated on the material surface before heating, creating a preliminary protective layer that reduces the need for extensive heat insulation during heating, thereby shortening heating time while still preventing temperature drop during forging
Solution Approach 2:
The invention changes the physical parameter of the coating material from solid glass woven fabric to liquid glass lubricant with specific viscosity range (10^-2 to 10^-7 Pa·s), which allows for better heat transfer during heating while maintaining temperature during forging
2Temperature
If glass woven fabric is wrapped around the material, then temperature is maintained, but temperature measurement becomes difficult
Solution Approach 1:
The invention extracts the heat insulation function from the glass woven fabric and replaces it with a thin glass lubricant coating that maintains temperature without interfering with temperature measurement devices
Solution Approach 2:
The glass lubricant acts as an intermediary substance that provides thermal protection while being transparent to temperature measurement, allowing thermocouples or other sensors to accurately measure material temperature through the coating
3Temperature
If the entire material is wrapped in glass woven fabric, then temperature drop is prevented, but process complexity increases
Solution Approach 1:
Instead of wrapping the entire material with glass woven fabric, the invention applies glass lubricant coating only to the surface areas that require temperature maintenance during forging, reducing the complexity of the coating process while maintaining effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables efficient hot forging of poor workability alloys by maintaining high temperatures and reducing the occurrence of defects such as cracks, thus improving the overall hot forging process.
Implementation Method 1
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 102 to 107 Pa·s in the heat-resistant insulation material bonding step
Implementation Method 2
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
Data Source
AI summary
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 102 to 107 Pa·s in the heat-resistant insulation material bonding step.