Hansheng Automation (Dongguan) Co., Ltd. is one of the most experienced manufacturers and suppliers of mirror polishing in China. If you're going to wholesale bulk cost-effective mirror polishing made in China, welcome to get pricelist and quotation from our factory. Also, customized service and OEM&ODM service are available.
Why Choose Us?
Tolerance Integrity
As a manufacturer capable of producing ISO/DIN Level 5 Gears and Harmonic Drives (≤ 5 arc sec), we understand precision. We ensure that polishing does not alter the geometric accuracy or fit of your components.
Ultra-Mirror Machining
For specific geometries, we use Single Point Diamond Turning (SPDT) or Micro-EDM to achieve a mirror finish directly through machining, minimizing human error.
Complex Geometry Handling
From internal cavities in medical manifolds to curved surfaces on robotic joints, our 5-axis capabilities and fluid polishing techniques ensure uniform consistency even in hard-to-reach areas.
Enhanced Physical Properties
Our process removes micro-cracks and stress concentrators, significantly improving corrosion resistance and fatigue strength for high-load parts.
Technical Capabilities & Standards
|
Parameter |
Specification / Capability |
|
Surface Roughness (Ra) |
Ra 0.005μm – 0.02μm (Optical Grade / Super Mirror) |
|
Dimensional Tolerance |
Maintained within ±0.002mm (after polishing) |
|
Industry Standards |
SPI-A1 / A2 (Society of the Plastics Industry) ASTM D523 (High Gloss Standard) ISO 1302 (Surface Texture Indication) |
|
Base Machining Method |
Seibu WEDM (Super Pika Finish), Precision Grinding, SPDT |
|
Polishing Media |
Diamond Compound Paste (Particle size: 0.25μm - 3μm) |
Material Suitability
|
Material Category |
Common Grades We Process |
|
Stainless Steel |
SUS303, 304, 316L, 17-4PH, 440C |
|
Mold Steel |
S136, NAK80, H13, P20 (Hardness up to HRC 60+) |
|
Non-Ferrous |
Aluminum (6061-T6, 7075), Brass, Oxygen-Free Copper |
|
Specialty Alloys |
Titanium (Ti-6Al-4V), Inconel, Tungsten Carbide |
Our Mirror Polishing Process
In our CNC machining center, polishing technology can be integrated into our CNC manufacturing process (if requested by the customer), which helps ensure the dimensional tolerance of the workpiece. Below we will introduce our mirror polishing process.
Engineering evaluation and tolerance planning
Before processing, our engineers will determine the polishing allowance. Ensure that key dimensions do not become undersized after polishing.
High precision basic machining
We use the "Super Pika Finish" technology of Seibu slow wire (M50B) or high-speed CNC milling to achieve a pre polished surface with Ra 0.2 μ m-0.4 μ m.
Progressive grinding
We use a series of oilstones and fine sandpaper (from 400 mesh to 2000 mesh) to remove processing marks. This stage focuses on smoothing out surface wave peaks.
Diamond paste polishing
We use diamond grinding paste of different grades (particle size as small as 1 μ m or 0.5 μ m) in combination with specialized fiber wheels or felt wheels to effectively eliminate fine scratches.
Final inspection and cleaning
The parts undergo ultrasonic cleaning to remove residual grinding paste. Finally, we use a roughness meter and a glossiness meter to verify the results, ensuring that the Ra value meets the specifications (such as Ra<0.01 μ m), and issue a quality report.
Industry Application
Medical & Bio-Engineering
Surgical instruments, orthopedic implants, and dental tools requiring easy-to-clean, sterile surfaces.
01
Optical & Photonics
Metal mirrors, laser reflectors, and lens housings requiring high reflectivity and low scatter.
02
Mold Making
Injection molds for transparent plastics (e.g., lenses, screens) requiring SPI-A1 finishes for flawless part release.
03
Precision Drive Systems
Polishing of gear teeth and flexible splines in harmonic drives to reduce friction and noise.
04
Quality Assurance
We validate our work with data, not just visual inspection.
Equipment
High-precision Surface Roughness Testers (Mitutoyo/Zeiss), Gloss Meters, and CMM.
Reporting
Full inspection reports available, including Ra/Rz values and dimensional verification.
FAQ
Q: Will your mirror polishing process affect the part's tolerances?
A: No. For parts requiring high precision, we will leave a few microns of polishing allowance, or use our "ultra-mirror finishing" technology (accuracy ±0.002mm) to ensure that the final product fully meets the drawing tolerances.
Q: What is the highest surface finish you can achieve?
A: Depending on the material, we can achieve an optical-grade mirror finish of Ra 0.005μm - 0.01μm, equivalent to the SPI-A1 standard.
Q: Can you polish even complex internal cavity structures?
A: Yes. Using our fluid polishing technology and high-precision electrical discharge machining (EDM) equipment, we can process complex internal cavities and fine structures that are difficult to reach with traditional tools.
Q: Do you accept small-batch custom orders?
A: Yes. Whether it's single-piece prototype development or large-scale production, we provide consistently high-standard service.
Q: How do you maintain critical tolerances (e.g., ±0.002mm) during aggressive mirror polishing?
A: We treat polishing as a controlled process, not an afterthought. For tolerances as tight as ±0.002mm, we limit polishing stock removal to less than 0.003mm and use semi‑automated polishing with intermediate dimensional verification. Pre‑polishing CNC machining targets the upper tolerance limit, and final dimensions are confirmed after each polishing pass.
Q: What is the practical difference between SPI‑A1, SPI‑A2, and SPI‑A3 finishes in mold making?
A: These standards define abrasive grades and resulting reflectivity. SPI‑A1 uses #3 diamond spray (3 µm grit), achieving Ra 0.012–0.025 µm. SPI‑A2 uses #6 diamond (6 µm), and SPI‑A3 uses #15 diamond (15 µm). For optical lenses, we can go beyond SPI‑A1 to sub‑nanometer super‑mirror finishes (Ra < 0.005 µm).
Q: How do you prevent "orange peel" and pitting during polishing of hardened steels?
A: Orange peel typically results from over‑polishing or excessive pressure on over‑tempered steels. Pitting occurs when non‑metallic inclusions are pulled out. We prevent these defects by using high‑purity vacuum‑degassed steels (e.g., S136‑ESR), precise pressure control, lubricant‑rich diamond suspensions, and semi‑automated polishing to limit manual variability.
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