Flexures serve as critical elastic alignment elements within high-resolution optical targeting systems, allowing controlled sub-micron movement along designated axes while remaining perfectly rigid in others. The client's design featured intricate, thin-leaf spring geometries intersecting across three perpendicular planes. The primary manufacturing risk involved material relaxation; removing stock from a pre-hardened block can release residual stresses, causing the thin flexible leaves to bow out of spec.
To counter this, the engineering team devised a multi-step operation that paired 5-axis pre-milling with multi-directional wire EDM slicing across three distinct projections. The parts were processed in batches, utilizing specialized tooling fixtures to maintain reference datums when rotating between setups. Inter-stage vacuum heat treatments (designated as profiles 2 and 3) were applied to systematically relieve internal material stresses prior to executing the final wire EDM finish passes.
The resulting flexures achieved the exact spring-rate constants and geometric parameters required by the customer's design. Every unit underwent non-destructive radiography and dimensional testing to confirm total structural uniformity and the absence of sub-surface micro-voids. This project highlights the company's mastery of complex operational routing, combining heat treatment, advanced EDM, and rigorous testing.
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