Smart watch cases are precision electronic appearance parts with strict requirements on surface fineness, gloss, texture and wear resistance. Mold surface treatment directly determines product appearance grade and batch production stability. Reasonable matching of polishing, texture treatment, electroplating, PVD coating and nitriding processes can effectively improve mold performance and product quality.
I. Mirror Polishing ProcessHigh-gloss watch shells require SPI A2-A3 mirror polishing. The mold cavity is polished step by step to remove processing lines and achieve ultra-smooth mirror effect. The surface has no scratches, fog lines and orange peel defects. The edges of key structures such as key grooves and camera holes are clear without collapse. Mirror treatment reduces demolding resistance and improves product surface gloss and flatness.
II. Sandblasting and Texturing Treatment
Matte and textured watch shells adopt sandblasting and chemical texturing. Sandblasting forms uniform micro concave and convex surfaces to cover slight shrinkage marks and improve hand feeling. Chemical etching forms fine leather texture and brushed texture to realize differentiated appearance design. The texture is uniform in depth and clear in boundary, improving product grade and scratch resistance.
III. Hard Chrome Plating ProcessWatch molds with large production volume are easy to corrode and stick to mold. Hard chrome plating forms a dense, high-hardness and low-friction coating on the cavity surface. It can effectively prevent mold adhesion and carbon deposition, improve corrosion resistance, and repair tiny pinholes on the mold surface. It stabilizes the high-gloss molding effect and greatly extends mold service life.
IV. PVD Vacuum Coating TechnologyHigh-end precision watch molds adopt PVD coating such as CrN and DLC. The ultra-thin coating does not affect mold precision, with super hardness, high temperature resistance and anti-sticking performance. It solves mold wear caused by reinforced materials, effectively prevents cavity pulling and product burrs, and maintains long-term stable texture and gloss of products in mass production.
V. Nitriding Hardening Treatment
Gas nitriding forms a high-hardness wear-resistant layer on the mold surface, improving thermal fatigue resistance and impact resistance. It has small deformation and does not damage mold precision. It effectively avoids surface cracking, pressure pits and abrasion of parting surfaces during long-term continuous production, improving overall mold stability and durability.
VI. ConclusionDifferent surface treatment processes have their own advantages and applicable scenarios. Mirror polishing guarantees high-gloss appearance, sandblasting and texturing realize personalized texture, hard chrome plating improves corrosion resistance, PVD coating enhances wear resistance, and nitriding strengthens overall stability. Scientific combination of various processes can comprehensively improve the molding quality of smart watch shells, reduce defective rate and mold maintenance cost, and meet the requirements of high-precision and high-stability mass production.
