Vane-type Oscillating Hydraulic Cylinder Body Housing Machining

Processing challenges

The oscillating hydraulic cylinder housing is a die-cast aluminum alloy component. It requires high bore accuracy to ensure precise fit with the rotor. The double-ear mounting surfaces must be machined to strict flatness and parallelity tolerances. Additionally, the positional accuracy of internal oil passages directly impacts hydraulic performance.

Solutions

High-precision CNC machining: roughing to remove casting allowances, followed by precision boring of the inner hole to meet tolerance requirements. Double ear mounting surfaces are processed using precision grinding. Oil passages are drilled with specialized drills and coordinate boring machines to ensure positional accuracy. Post-machining, CMM inspection verifies that all critical dimensions comply with drawing specifications.

Processed Results

• • Inner bore tolerance meets H7 fit requirements.
• • Bore axis mounting surface flatness ≤ 0.02mm
• • Oil passage hole position accuracy ±0.05mm
• • Surface roughness Ra1.6, meeting hydraulic sealing requirements.
• • Consistent mass production with a pass rate of 99.2%.