Medical Vision Tester Aluminum Housing | Die Cast + CNC + Spray Paint | Bearing Seat Precision

Product Description

OVERVIEW High-precision aluminum housing for medical vision testing instruments (e.g., autorefractors, visual acuity screeners, ophthalmic diagnostic devices). Manufactured through a tightly controlled process chain: High-Pressure Die Casting (HPDC) → CNC precision machining → Spray painting / powder coating. Designed to meet stringent medical-device standards for appearance, dimensional accuracy, and functional integration—including machined bearing seats for smooth rotating assemblies. MANUFACTURATIONS SPECIFICATIONS • Material: Aluminum alloy ADC12 / A380 (medical-grade options available) • Process Flow: – High-Pressure Die Casting (HPDC) for complex net-shape shell – CNC milling, drilling, and boring on critical faces and bearing seats – Deburring, surface cleaning, and pretreatment – Spray painting or powder coating for premium medical appearance • Bearing Integration: CNC-bored bearing seats with tight roundness and position tolerance to ensure shaft concentricity and low-friction rotation • Dimensional Tolerance: ±0.05mm general; ±0.01mm or better on bearing bores, mating faces, and sealing interfaces • Surface Finish: Smooth, uniform spray coating with excellent adhesion, hardness, and chemical resistance • A-Surface Quality: Zero porosity, no sink marks, no flow lines, no flash on visible painted surfaces • Wall Thickness: Optimized for rigidity without excess weight KEY ADVANTAGES • Bearing-Ready Precision: CNC-machined bearing seats eliminate casting tolerance stack-up—shafts mount and rotate smoothly without rework. • Premium Medical Appearance: Multi-stage spray painting delivers a clean, professional, clinic-ready finish with high color consistency. • Dimensional Stability: Die casting + localized CNC ensures both complex shape and critical-fit accuracy in one part. • Rigid & Lightweight: Aluminum alloy provides structural strength, EMI shielding, and thermal dissipation for sensitive optics/electronics. • Porosity Control: Casting parameters and vacuum-assisted options minimize internal porosity for superior coating adhesion and pressure tightness. • Turnkey Solution: One supplier handles casting, machining, painting, and inspection—no subcontractor handoffs. TYPICAL APPLICATIONS • Vision tester / autorefractor outer housings • Ophthalmic diagnostic device enclosures • Medical instrument chassis with rotating mechanisms (bearing-supported shafts, lens turrets, adjustment knobs) • Clinical equipment shells requiring premium painted finishes • Electronic medical device (EMD) casings with integrated bearing or bushing features PROCESS NOTE Bearing seats are CNC-bored after casting to guarantee roundness, perpendicularity, and position accuracy—critical for low-vibration, low-noise shaft rotation in ophthalmic instruments. Spray painting follows thorough pretreatment (degreasing, phosphating/chromating, primer) to ensure coating adhesion on aluminum substrates. Paint film thickness, gloss level, and cross-cut adhesion are verified per medical-device cosmetic standards. QUALITY ASSURANCE • CMM inspection of all critical dimensions, including bearing bore diameter, position, and perpendicularity • Bore roundness and surface roughness checks on bearing seats • Cross-cut adhesion test, film-thickness measurement, and gloss verification on painted surfaces • Visual inspection under controlled lighting for A-surface defects (no pinholes, orange peel, or color mismatch) • Material certificate, COC, and FAIR available with every shipment

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