Glass Surface Coating for Crack-Sensitive Alloy Hot Working
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Solution Overview
Problem
Crack-sensitive alloys face challenges during hot working operations due to surface and edge cracking, which increases production time and expense, and conventional methods like alloy canning have drawbacks such as process complexity and impaired visual monitoring.
Innovation Solution
A method involving depositing a glass material onto an alloy workpiece to form a surface coating that reduces heat loss, which is then heated to create a viscous coating that adheres to the surface, thereby reducing thermal gradients and cracking during hot working processes like forging and extrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alloy canning is used to protect workpiece during hot working, then surface cracking is reduced, but process complexity increases and visual monitoring is impaired
Solution Approach 1:
The invention extracts the protective function from the complex alloy can structure and implements it through a simpler glass coating applied directly to the workpiece surface. The glass coating provides thermal insulation and crack protection without requiring a separate can structure, thereby reducing process complexity while maintaining reliability.
Solution Approach 2:
The glass coating forms a thin film on the workpiece surface that provides protective functions. This thin film approach replaces the bulky alloy can structure, allowing for simpler processing while maintaining the protective effect against surface cracking during hot working operations.
2Loss of energy
If alloy canning is used to thermally insulate workpiece, then heat loss is reduced, but visual monitoring capability is impaired
Solution Approach 1:
The glass coating can be formulated with specific optical properties that allow visual monitoring of the workpiece surface during hot working. The coating maintains thermal insulation while permitting operators to observe surface conditions, crack formation, and workpiece integrity through the transparent or translucent glass layer.
3Temperature
If glass coating is applied to reduce heat loss, then thermal gradients are minimized, but additional processing steps are required
Solution Approach 1:
The glass coating is applied to the workpiece surface before hot working operations begin. This preliminary action ensures that the thermal insulation is already in place when heating commences, minimizing thermal gradients from the start of the process and eliminating the need for additional intermediate processing steps during hot working.
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 glass surface coating effectively reduces heat loss, minimizes surface cracking, and lubricates the alloy workpiece, allowing for more efficient and cost-effective hot working with improved yield and reduced process complexity.
Implementation Method 1
heating the glass material to form a surface coating on the alloy workpiece that reduces heat loss from the alloy workpiece
Implementation Method 2
The alloy can thermally insulates and mechanically protects the enclosed workpiece... The alloy can thermally insulates the alloy workpiece by action of the air gaps between the workpiece and the alloy can's inner surfaces
Implementation Method 3
The glass surface coating effectively reduces heat loss, minimizes surface cracking, and lubricates the alloy workpiece
Data Source
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AI summary
The invention provides a method of processing an alloy workpiece comprising disposing a glass fabric directly onto at least a portion of a surface of an alloy workpiece, heating the glass fabric to form a molten glass surface coating on the alloy workpiece, and hot working the alloy workpiece with at least one of a die and a roll, wherein the die or the roll contacts the molten glass surface coating on the alloy workpiece.