Machining challenges
Thin fins and complex features require distortion control and consistent datums. The hard bore coating adds demanding profile-grinding and surface-finish requirements.
Manufacturing route
Casting inspection and ageing; rough and semi-finish machining; HVOF nickel-based coating; bore profile grinding; 5-axis finishing of fins, end faces and holes; cleaning.
Key control points
Use common datums and dedicated fixtures. Control the specified coating thickness of 0.15 ± 0.01 mm, bore surface roughness ≤ 0.12 µm and bore-to-end-face perpendicularity.
Dimensional and surface inspection
CMM inspection verifies bore profile and end faces. Coating checks cover thickness distribution, roughness, microhardness, porosity and cracks; wear testing was validated by the customer.
The requirements and manufacturing route shown here apply to this project. New components are reviewed against their own drawings and agreed specifications.
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