Titanium Part Contouring via Controlled Thermal Forming
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Solution Overview
Problem
Current methods for manufacturing contoured titanium parts are inefficient, requiring large amounts of material and complex machinery, or result in residual stress and undesirable microstructure changes due to high temperatures in super plastic forming.
Innovation Solution
A system using a multi-axis machine, a die, electrical clamps, sensors, and a control system to heat and shape titanium parts within a target temperature range between auto-relief and super plastic forming temperatures, allowing for contoured net or near-net shape production without complex equipment and preserving mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If contoured titanium parts are machined out of a large block of titanium, then the part shape and precision are improved, but material waste and equipment complexity increase
Solution Approach 1:
The titanium part is pre-heated to a target temperature within a target temperature range (between auto-relief temperature and minimum super plastic forming temperature) before forming. This preliminary heating action reduces the material's flow stress, enabling near-net shape forming with minimal material waste while maintaining manufacturing precision through controlled thermal conditions.
Solution Approach 2:
The method changes the temperature parameter of the titanium part to within a specific target temperature range during forming. This parameter change allows the material to become more formable without requiring excessive material removal, thus reducing waste while maintaining the ability to achieve precise contoured shapes.
2Loss of substance
If super plastic forming is used to curve titanium sheets, then material waste is reduced, but microstructure changes and mechanical property degradation occur
Solution Approach 1:
The method precisely controls the temperature parameter within a target temperature range that is below the minimum temperature required for super plastic forming. This parameter control allows forming to occur without reaching temperatures that would cause undesirable microstructure changes, thus preserving mechanical properties while still achieving material efficiency.
Solution Approach 2:
The method uses a die to imprint the desired contour shape onto the titanium part. By using the die as a template or copy of the target geometry, the part can be formed to near-net shape without requiring super plastic forming temperatures, thereby avoiding microstructure degradation while minimizing material waste.
3Shape
If high force is applied to curve titanium sheets at room temperature, then shaping is achieved, but residual stress and die strength requirements increase
Solution Approach 1:
The titanium part is pre-heated to a target temperature within a target temperature range before the die is applied. This preliminary thermal action reduces the material's yield strength and flow stress, allowing the die to shape the contour with significantly reduced force, thereby minimizing residual stress while achieving the desired shape.
Solution Approach 2:
The method changes the temperature parameter to within a specific range that reduces the titanium's mechanical strength temporarily during forming. This parameter change enables contour shaping with lower forces, reducing residual stress, while the temperature is controlled to remain below super plastic forming thresholds to avoid permanent material degradation.
4Manufacturing precision
If complex multi-axis machining is used to create contoured parts, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The method replaces complex mechanical multi-axis machining with a thermal-forming process using a simple die. By heating the titanium part to a target temperature range that reduces flow stress, the contour shape is achieved through die imprinting rather than complex mechanical removal, substituting thermal and chemical processes for complex mechanical systems.
Solution Approach 2:
The method changes the temperature parameter of the titanium part to within a target temperature range that enables forming with simple equipment. This parameter change allows a simple die to achieve contour precision that would otherwise require complex multi-axis machining, thereby reducing device complexity while maintaining manufacturing precision.
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
This method reduces material waste and avoids undesirable stress and microstructure changes, enabling efficient production of contoured titanium parts with non-uniform thickness without complex machinery or high-temperature processing.
Implementation Method 1
the part may be heated by the die, Joule heating via the electrical clamps, external heaters, or a combination thereof
Implementation Method 2
Joule heating via the electrical clamps
Data Source
AI summary
A system and method for shaping a net or near-net titanium part, the method comprising machining a piece of titanium into a titanium part having non-uniform thickness, heating the titanium part to a target temperature within a target temperature range between an auto-relief temperature of the titanium part and a minimum temperature required for super plastic forming of the titanium part, and lowering a die into the titanium part with sufficient force to shape the titanium part. The system for shaping the titanium part may comprise a multiple-axis machine, a die, electrical clamps, sensors, and a control system for adjusting heating temperatures based on information received from the sensors regarding the titanium part.