Sacrificial Preforms for Machining Thin Titanium Parts
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Solution Overview
Problem
Conventional machining techniques are inadequate for manufacturing thin components from difficult-to-machine and expensive materials like titanium and nickel alloys due to insufficient static and dynamic stiffness, leading to tool wear and instability during machining.
Innovation Solution
The use of sacrificial structure preforms with geometries that provide higher stiffness than the finished component, minimizing material usage and tool wear, and configured to support machining forces, which are then removed after machining, allowing for high-precision machining of thin parts with reduced material consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional machining techniques are used on thin components, then the finished component geometry is achieved, but the workpiece lacks sufficient static and dynamic stiffness leading to tool wear and machining instability
Solution Approach 1:
The patent applies preliminary action by adding sacrificial stiffening structures to the workpiece before machining begins. These structures are integrated into the workpiece design and provide the necessary stiffness during the machining process. After machining is complete, the sacrificial structures are removed, leaving the final component geometry. This preliminary reinforcement enables stable machining of thin components that would otherwise lack sufficient rigidity.
Solution Approach 2:
The sacrificial stiffening structures serve as an intermediary element between the machining tool and the thin workpiece. These temporary structures provide the mechanical support needed during machining operations, absorbing cutting forces and preventing workpiece deflection. Once their supporting function is complete, they are removed, having served their intermediary purpose.
2Strength
If bulk structures are used to support thin parts during machining, then sufficient stiffness is provided, but excessive material must be removed resulting in unnecessary tool wear
Solution Approach 1:
The patent applies local quality by placing sacrificial stiffening structures only in specific locations where they are most needed to provide machining stability. Rather than using bulk structures throughout the entire workpiece, the stiffening elements are strategically positioned to provide local reinforcement. This minimizes the total amount of material that must be removed while still achieving the necessary stiffness in critical areas.
Solution Approach 2:
The support structure is segmented into discrete sacrificial stiffening elements rather than using a continuous bulk structure. These segmented elements can be optimally positioned and sized to provide necessary support with minimal material. The segmentation allows for precise placement of stiffness where needed without adding unnecessary material elsewhere in the workpiece.
3Quantity of substance
If near-net shape forming or casting is used to manufacture thin components, then material usage is reduced, but the resulting thin structures lack stability during subsequent machining operations
Solution Approach 1:
The patent combines near-net shape forming with preliminary action by creating a preform close to the final geometry and then adding sacrificial stiffening structures before machining. This approach maintains the material efficiency of near-net shape production while temporarily enhancing the workpiece stability needed for accurate machining. The sacrificial structures are added as a preliminary step that enables the subsequent precision machining of the near-net shape component.
Data Source
AI summary
A manufacturing method, including: given a predetermined finished part geometry, providing a sacrificial structure preform that simultaneously contains the finished part geometry, minimizes material that must be removed from the sacrificial structure preform to achieve the finished part geometry during machining, and has a sufficient stiffness to resist a machining force that will be applied during machining without allowing the finished part geometry to be compromised; and machining the sacrificial structure preform to achieve the finished part geometry. The manufacturing method also includes preliminarily estimating a stiffness of the finished part geometry and the machining force that will be applied during machining.