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What factors influence mold polishing?

Release date:

2022/05/18

High‑quality steel is essential for achieving excellent polishing results; various inclusions and porosity within the steel can adversely affect the polishing outcome. To attain superior polishability, the required surface roughness must be specified at the outset of machining. When a part is designated for mirror‑finish polishing, it is imperative to select steels with outstanding polishability and ensure they have undergone proper heat treatment; otherwise, the desired results cannot be achieved.

　　Factors Affecting Mold Polishing

　　1. Heat Treatment Process

　　If heat treatment is improper, resulting in uneven surface hardness or variations in material properties, it can pose challenges during polishing.

　　2. Quality of Steel Materials

　　High‑quality steel is essential for achieving excellent polishing results; various inclusions and porosity within the steel can adversely affect the polishing outcome. To attain superior polishability, the required surface roughness for polishing must be specified at the outset of machining. When a part is designated for mirror‑finish polishing, it is imperative to select steels with outstanding polishability and ensure they have undergone proper heat treatment; otherwise, the desired results cannot be achieved.

　　3. Polishing Techniques

　　Yishun Mold Polishing continues its analysis: since polishing is predominantly a manual process, human skill remains the primary factor influencing polishing quality. It is commonly believed that polishing techniques determine surface roughness; however, superior polishing also requires high‑quality tool steel and proper heat‑treatment processes to achieve satisfactory results. Conversely, even the finest steel cannot attain a mirror finish if the polishing technique is inadequate.

　　4. Workpiece Surface Condition

　　During machining, the surface layer of a material can be damaged by heat, residual stresses, or other factors, and improper cutting parameters can adversely affect the polishing outcome. Surfaces subjected to electrical discharge machining (EDM) are more difficult to grind than those produced by conventional machining or heat treatment; therefore, EDM should be followed by an EDM finishing pass to avoid the formation of a hardened surface layer. If the EDM finishing parameters are not properly selected, the depth of the heat-affected zone can reach up to 0.4 mm. The hardened layer exhibits higher hardness than the base material and must be removed.

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