Titanium polishing

steelstainless steelaluminum

Overview

Hansheng Automation provides precision mirror polishing services for metal and alloy components, delivering optical-grade surface finishes integrated with precision CNC manufacturing workflows. The service targets applications that require ultra-low roughness and high reflectivity.

Core capabilities and methods

• Primary technologies: single-point diamond turning (SPDT), precision EDM (micro-EDM), fluid polishing, and integrated CNC polishing workflows (Seibu WEDM / Super Pika Finish, high-speed CNC milling).
• Polishing media: diamond compound and diamond grinding pastes with particle sizes from ~0.25 µm to ~3 µm; final grades commonly 0.5–1 µm used with fiber or felt wheels.

Why choose this service?

• Tolerance integrity: processes planned to preserve geometric accuracy and critical dimensions; polishing allowances are engineered to avoid undersizing.
• Direct mirror machining: SPDT and micro-EDM can achieve mirror finishes during machining to reduce manual finishing.
• Complex geometry capability: 5-axis machining and fluid polishing produce consistent finishes in internal cavities and on curved surfaces.
• Improved functional performance: removal of micro-cracks and stress concentrators enhances corrosion resistance and fatigue life.

Mirror polishing process (workflow)

• Engineering evaluation and tolerance planning to define polishing allowances.
• High-precision base machining (Seibu slow wire M50B or high-speed CNC milling) to reach pre-polish Ra targets.
• Progressive grinding: sequential abrasives (typically 400–2000 mesh) to remove machining marks and smooth waves.
• Multi-stage diamond paste polishing with decreasing particle sizes using specialized wheels to eliminate fine scratches.
• Final inspection and cleaning: ultrasonic cleaning, verification with roughness and gloss meters, and issuance of quality data.

Material suitability

• Stainless steels: SUS303, 304, 316L, 17-4PH, 440C.
• Mold steels: S136, NAK80, H13, P20 (hardness up to HRC 60+).
• Non-ferrous metals: aluminum (6061‑T6, 7075), brass, oxygen-free copper.
• Specialty alloys: Ti-6Al-4V, Inconel, tungsten carbide.

Industry applications

• Medical & bio-engineering: surgical instruments, implants, dental tools requiring sterile, easy-to-clean surfaces.
• Optical & photonics: metal mirrors, laser reflectors, lens housings requiring high reflectivity and low scatter.
• Mold making: injection molds for transparent plastics needing SPI-A1 finishes for flawless part release.
• Precision drive systems: polishing of gears and splines in harmonic drives to reduce friction and noise.

Quality assurance

• Inspection equipment: high-precision surface roughness testers (Mitutoyo/Zeiss), gloss meters, and CMM for dimensional checks.
• Reporting: full inspection reports including Ra/Rz values and dimensional verification available on request.

Technical specifications

• Achievable surface roughness (Ra): 0.005 µm – 0.02 µm (optical / super mirror); optical finishes down to ~0.005–0.01 µm depending on material.
• Dimensional tolerance after polishing: typically maintained within ±0.002 mm.
• Referenced standards: SPI-A1 / A2, ASTM D523 (gloss), ISO 1302 (surface texture).
• Base preparation methods: Seibu WEDM (Super Pika Finish), precision grinding, SPDT, high-speed CNC milling.
• Polishing media: diamond compound and diamond grinding pastes (particle sizes ~0.25 µm – 3 µm; fine grades 0.5–1 µm for final passes).