Front Subframe Mold Surface Polishing Process & Surface Roughness Control

Front subframe mold cavity adopting multi-stage polishing process controls cavity surface roughness Ra ≤0.08μm and reduces sheet metal adhesion and workpiece surface defects.
Multi-stage polishing starts from coarse grinding, semi-fine grinding, fine grinding and finally diamond paste mirror polishing. Different polishing standards are applied to draw bead, forming cavity and flange region. Good surface finish lowers friction between blank and mold cavity and suppresses galling.
Aluminum alloy subframe forming data shows cavity with poor surface roughness easily produces aluminum built-up edge, requiring frequent mold cleaning and polishing maintenance.
Local front subframe mold suppliers can carry out re-polishing service for worn cavity surface, and provide 24-hour remote guidance for polishing procedure control.
The difference between ordinary manual polishing and standardized multi-stage polishing is obvious. Simple polishing cannot achieve uniform roughness over large cavity surface; standardized process guarantees consistent finish across whole forming area.
A common polishing pitfall is over-polishing the cavity surface. Excessive polishing removes material and changes cavity dimension, resulting in part size deviation.
Multi-stage high-precision cavity polishing increases front subframe mold cost by 8%–17%. This expenditure reduces workpiece surface defects and extends cavity coating service life.
Common polishing related problems include uneven surface roughness, local over-polishing, polishing scratch and residual abrasive particle embedded in steel surface. Surface roughness sampling inspection is required after polishing.
When comparing front subframe mold manufacturers, check surface roughness test report and polished cavity sample. Professional factories control polishing allowance strictly.
Precision multi-stage polishing specification for front subframe molds is critical for aluminum alloy and high surface requirement high-strength steel subframe forming.
FAQ
Q1: What is target surface roughness for high-quality subframe forming cavity?
A: Normally require cavity surface roughness Ra ≤0.08μm for high forming quality requirement.
Q2: What defect will poor cavity surface roughness cause?
A: Higher friction, material galling, built-up edge and scratches on stamped workpiece.
Q3: How much extra cost for multi-stage high-precision polishing?
A: Standardized multi-stage polishing adds 8% to 17% of total mold manufacturing cost.
Q4: Which front subframe mold factory implements standardized cavity polishing process?
A: Source mold factories with dedicated polishing workshop and roughness inspection capability.
Q5: What risk of over-polishing mold cavity?
A: Remove excess cavity material, change cavity geometry and cause part dimension deviation.
Q6: Can cavity be re-polished after mass production wear?
A: Yes, but material removal amount must be controlled to avoid exceeding dimension allowance.