Standard casting mold polishing process removes machining traces and surface defects, improving casting surface quality and reducing mold adhesion risks.
Aluminum casting mold polishing is divided into three stages: rough polishing, fine polishing and mirror polishing, with targeted standards for different mold positions.
Cavity forming surface requires mirror polishing to Ra0.4μm, ensuring smooth casting surface without tool marks or pitting defects.
Runner and gating system surfaces adopt fine polishing to Ra1.6μm, balancing polishing efficiency and molten aluminum fluidity.
Exhaust groove and cooling channel reserved surfaces use rough polishing to remove burrs, avoiding assembly interference and gas blockage.
Polished molds reduce casting flash and burr defects by 45%, greatly reducing post-casting trimming workload.
LPDC and CPC precision molds require full mirror polishing of forming surfaces, while gravity molds only need partial fine polishing.
Aluminum wheel mold rim and spoke surfaces implement the highest mirror polishing standard to ensure smooth wheel blank appearance.
EV structural part mold thin-wall edges focus on uniform polishing to avoid stress concentration and local deformation.
Standard polishing process eliminates micro-cracks on H13 steel surface, improving mold thermal fatigue resistance by 18%.
Casting mold trial-test confirms that high-standard polishing reduces surface-induced porosity shrinkage defects by 22%.
Mold polishing is a key post-processing procedure connecting mold machining and formal production, directly determining the surface quality of aluminum alloy castings and the anti-sticking performance of molds. CNC machining inevitably leaves tool marks, burrs and micro-pits on the mold surface, which will cause casting burrs, surface pitting and molten aluminum adhesion during mass production. Graded polishing standards are formulated according to mold functional areas: core forming surfaces pursue ultra-high smoothness to meet precision casting appearance requirements; flow channel surfaces ensure unobstructed molten aluminum flow; auxiliary surfaces remove only harmful burrs to control processing costs. High-precision LPDC, CPC wheel molds and EV structural molds rely on mirror polishing to achieve high-quality casting surface effects. In addition to improving appearance, professional polishing repairs micro-defects on H13 steel surface, eliminating potential crack initiation points and improving mold durability. Strict polishing specifications and post-polishing inspection ensure consistent surface quality of each mold, stabilizing casting yield and reducing secondary processing costs for foundry enterprises.
FAQs
Q1: How many stages are in standard mold polishing process? A1: Three stages: rough, fine and mirror graded polishing.
Q2: What roughness is required for mold cavity forming surfaces? A2: Mirror polishing up to Ra0.4μm for ultra-smooth casting surface.
Q3: What polishing standard is used for mold runner surfaces? A3: Fine polishing to Ra1.6μm for stable molten aluminum flow.
Q4: How much do qualified polishing reduce casting burr defects? A4: Effectively reduce flash and burr defects by 45%.
Q5: Which molds require full mirror polishing treatment? A5: All LPDC and CPC precision casting molds for high-end products.
Q6: How does polishing improve mold fatigue performance? A6: Eliminate surface micro-cracks, improving fatigue resistance by 18%.
Q7: What polishing is required for EV mold thin-wall edges? A7: Uniform fine polishing to eliminate stress concentration risks.
