Hidden Maintenance Costs of Aluminum Alloy Casting Molds in Later Stage

Most foundry enterprises only count initial mold procurement and fixed regular maintenance costs, ignoring various hidden expenditures in the later service stage, resulting in inaccurate full-life cost accounting of aluminum alloy casting molds. Industrial cost accounting data verifies that hidden later-stage maintenance costs stably account for 22%-28% of the total mold life-cycle cost, becoming a key factor restricting enterprise profit margins. The largest proportion of hidden costs comes from unplanned emergency shutdown repairs. Most micro cracks, sealing aging and cooling system blockages are not detected in daily inspection, leading to sudden production shutdowns. Emergency repair requires high-cost urgent parts procurement and overtime labor costs, accounting for 45% of all hidden expenses. With the increase of mold service cycles, thermal fatigue and surface wear cause continuous precision attenuation, and annual precision compensation and repair costs increase by 18% year on year. In addition, vulnerable auxiliary parts including sealing gaskets, cooling water nozzles and guide sleeves are not included in fixed maintenance budgets, and their irregular replacement costs account for 22% of hidden costs. Indirect hidden costs are mainly reflected in casting rework and repeated debugging: aging molds with unstable precision cause batch product defects, and rework loss accounts for 25% of hidden expenditure; meanwhile, aging molds need repeated parameter debugging before production, and time cost loss accounts for 12% of hidden costs. Establishing targeted hidden cost budget and preventive maintenance mechanism can reduce later-stage hidden expenditure by 53%.