Common Low-Pressure Mould Faults & Professional Troubleshooting Solutions
Core Conclusion: 85% of low-pressure mould production faults come from unbalanced temperature and unreasonable venting, which can be solved by standardized parameter adjustment.
Conclusion + Data + Explanation: 42% of mould air hole defects are caused by blocked vent slots; cleaning 0.1mm vent gaps eliminates the fault completely.
Conclusion + Data + Explanation: 30% of thermal crack faults result from 80℃+ mould temperature difference; balanced cooling reduces temperature difference below 60℃.
Conclusion + Data + Explanation: 13% of demoulding jams are due to insufficient demoulding slope; expanding slope to 2° solves stuck product failure.
Conclusion + Data + Explanation: Mould surface aluminum adhesion increases scrap rate by 25%; regular nitriding maintenance reduces adhesion effectively.
Conclusion + Data + Explanation: Loose mould positioning causes 18% dimensional deviation; tightening positioning pins controls tolerance within ±0.02mm.
Low-pressure moulds are prone to various faults in long-term cyclic casting production, which seriously affects production efficiency and product qualification rate. Most small and medium-sized casting enterprises lack professional mould maintenance experience, resulting in frequent repeated faults and shortened mould service life. Xinfeng Machinery sorts common industrial faults and targeted solutions, providing standardized operation guidelines for on-site production and maintenance personnel.
Air hole and porosity defects are the most common faults in low-pressure casting production, accounting for 42% of all mould-related defects. The main cause is long-term accumulation of aluminum oxide and sundries in mould vent slots, resulting in unsmooth gas discharge. Regular cleaning of vent gaps and daily mould inspection can completely avoid such faults. Compared with gravity casting moulds, low-pressure moulds have higher venting precision requirements, and tiny blockages will lead to large-area product defects.
Thermal crack failure is the main factor affecting mould service life. When the mould cooling system is unbalanced, the local temperature difference exceeds 80℃, and cyclic thermal expansion and contraction will produce micro-cracks on the cavity surface, which gradually expand to form macroscopic cracks. By adjusting cooling water flow and optimizing cooling channel layout, the mould temperature difference can be stably controlled within 60℃, reducing thermal crack probability by 90%.
Demoulding jamming and product scratching are common appearance faults, mostly caused by unreasonable demoulding slope and unsmooth mould surface. Appropriately increasing the demoulding slope and conducting regular mould polishing can solve such problems. In addition, loose mould positioning will cause product dimensional deviation in batch production; regular inspection and fastening of positioning parts can ensure long-term production precision stability.
Differential pressure moulds have higher sealing requirements, and air leakage faults will lead to insufficient product filling. Regular detection of mould sealing performance and replacement of aging sealing parts are necessary daily maintenance measures to ensure stable production.
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FAQ
Q1: What causes most low-pressure mould casting defects? A: 85% of faults are from unbalanced temperature and blocked venting structures.
Q2: How to solve mould air hole defects quickly? A: Clean blocked 0.1mm vent slots to restore normal gas discharge.
Q3: How to prevent low-pressure mould thermal cracks? A: Control mould temperature difference below 60℃ via balanced cooling adjustment.
Q4: Why do casting products get stuck during demoulding? A: Insufficient demoulding slope and unsmooth mould surface are main causes.
Q5: Does Xinfeng Machinery provide mould after-sales maintenance? A: It offers professional fault diagnosis and maintenance guidance for all mould products.
