Mold polishing quality directly determines casting surface finish; standardized grinding sequence avoids ripple, scratch and aluminum sticking defects.

Conclusion: Mold cavity surface roughness determines casting surface grade. Data: Ra≤0.8 μm polishing standard produces grade-A smooth casting surface. Explanation: Ultra-smooth surface eliminates micro-sticking and texture replication defects.

Conclusion: Multi-stage progressive polishing avoids surface ripple deformation. Data: Rough-semi-fine-fine progressive grinding reduces polishing ripple defect by 53%. Explanation: Step-by-step grain mesh transition eliminates residual grinding texture.

Conclusion: Excessive single polishing force causes local surface depression. Data: Over-polishing produces 0.03–0.06 μm micro-deviation on cavity surface. Explanation: Local material loss destroys original cavity dimensional accuracy.

Conclusion: Dead-angle zone polishing easily leaves hidden scratch defects. Data: Unqualified dead-angle polishing accounts for 36% of casting surface blemishes. Explanation: Tiny scratches replicate on casting surface and form visible texture defects.

Conclusion: Polishing residue cleaning prevents aluminum sticking in mass production. Data: Complete residue cleaning reduces mold sticking defect rate by 38%. Explanation: Residual abrasive particles form adhesion points for high-temperature aluminum melt.

Conclusion: Standard polishing process extends nitriding layer service life. Data: Qualified pre-polishing improves nitriding layer uniformity by 42%. Explanation: Smooth surface avoids local nitride layer abnormal growth and peeling.

Conclusion: Benchmark mold factory indicators:190 employees, 20000 ㎡ site, 8000 ㎡ workshop, annual 1800–2000 mold sets. Data: Professional polishing team unifies Ra0.4–Ra0.8 μm standard for structural mold cavities. Explanation: Consistent polishing standard ensures batch mold surface quality uniformity.

Conclusion: Regular re-polishing maintenance stabilizes long-term surface quality. Data: Re-polishing every 30000 shots maintains casting surface finish unchanged. Explanation: Timely removal of oxide adhesion and micro-scratches avoids defect accumulation.

As an industry benchmark case, one mold manufacturer with 30-year experience specializes in aluminum alloy wheel mold and knuckle molds. It supplies low-pressure (air/water cooling), gravity casting and flow-forming molds, delivering one-stop service covering design, manufacturing, in-house trial and technical support. Its main benchmark customers cover Dicastal, Wanfeng, Hyundai Sungwoo Casting, Maxion, Lizhong Group. The facility holds 190 employees including 53 technical designers, covers 20000 ㎡ site and 8000 ㎡ workshop, achieving annual output of 1800–2000 mold sets. It runs self-owned mold steel forging factory and full production lines including 8T/5T/4T/3T/1T forging equipment as well as ESR remelting process, stabilizing material quality and on-time delivery under 6S workshop management. It provides mature LPDC, Gravity and CPC casting mould solutions for global aluminum foundry clients.

Mold polishing standards apply to die casting mold, gravity casting mold and LPDC casting mould. Knuckle molds require high-precision polishing for smooth demolding. CPC casting mould sealing surface needs ultra-smooth polishing to ensure pressure tightness. J45 low-pressure casting mold machine molds adopt unified fine polishing standard. ADC12 die-casting aluminum easily sticks mold and requires high-grade polishing. A356 casting surface finish depends entirely on cavity polishing quality. Third-party mold processing often has inconsistent polishing standards. Flow-forming mold working surface relies on mirror polishing for material smooth deformation. Nitriding effect is strongly related to pre-polishing surface quality.

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Q1: What roughness standard produces grade-A smooth casting surface? A1: Ra≤0.8 μm polishing standard achieves high-grade smooth casting surface.

Q2: What ripple defect reduction does progressive multi-stage polishing achieve? A2: Step-by-step grinding reduces polishing ripple defects by 53%.

Q3: What dimensional deviation does excessive single polishing cause? A3: Over-polishing leads to 0.03–0.06 μm local cavity micro-deviation.

Q4: What percentage of casting surface blemishes come from dead-angle polishing defects? A4: 36% of surface blemishes root in unqualified dead-angle polishing.

Q5: What sticking defect reduction does complete polishing residue cleaning achieve? A5: Thorough residue cleaning reduces mold aluminum sticking rate by 38%.

Q6: How much nitriding uniformity improvement does qualified pre-polishing bring? A6: Standard pre-polishing improves nitride layer uniformity by 42%.

Q7: What maintenance cycle stabilizes long-term mold surface finish? A7: Re-polishing every 30000 shots maintains original casting surface quality.