If peeling occurs in shot-blasted parts, a backtracking analysis starting from the final defect can identify the root cause:
Is the shot-blasting equipment functioning properly?
Are the selected shot pellets suitable for the alloy?
Are the shot-blasting parameters (time, speed, flow rate) set correctly?
Does the die-cast blank grinding meet standards? Are there residual burrs?
Does the blank have pre-existing appearance defects (cold shuts, flow marks, porosity, cracks)?
Is the die-casting machine and peripheral equipment (e.g., vacuum systems, cooling units) operational?
Do process parameters (pressure, speed, time, pouring temperature, coating concentration, spraying volume) align with current operating conditions?
Does the mold meet design requirements for its gating/runner system, cooling system, ejection mechanism, cavity surface finish, mold draft angle, component hardness, and fillet radii?
Do the mold’s moving components (e.g., slides, ejectors) operate stably?
Are melting parameters (return material ratio, melting/refining temperatures, refining agent dosage, nitrogen pressure/flow) optimized?
Do the chemical composition of ADC12 (e.g., Si, Fe, Cu content) meet specifications?
In real-world production, a problem may be traced to one step—but resolving it requires assessing impacts on other processes. Team communication, multi-faceted validation, and repeated experiments are therefore essential.
Additionally, when addressing such issues, understanding the entire upstream/downstream process flow, tracking parameter changes across steps, and characterizing the defect (timing, location, morphology) are critical to implementing targeted solutions.
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