Multiple Hazards of Air Leakage on Molding Machines To Casting Production

Molding machines rely on compressed air to drive processes including vibration compaction, squeeze compaction, pattern stripping and flask closing. Air leakage in the pneumatic system triggers cascading losses in five dimensions: casting quality, equipment wear, production cost, production efficiency and on-site safety. 

First, the scrap rate of castings rises sharply. Insufficient air supply to cylinders results in uneven and loose mold hardness. Molds are prone to mold swelling and metal overflow during pouring, causing casting defects such as blowholes, shrinkage porosity and dimensional deviation. Insufficient power for pattern stripping and flask closing leads to sand collapse and misaligned flasks. Jamming of sand hoppers and flask turnover mechanisms creates inconsistent mold thickness, hurting dimensional uniformity of mass-produced castings.

Second, equipment wear accelerates with frequent shutdowns for maintenance. Low-pressure operation speeds up aging and abrasion of cylinder sealing rings, creating a vicious cycle of worsening air leakage. Solenoid valves perform frequent pressure compensation switching, accelerating wear of valve spools and seats. Leaking air carries dust into guide rails and guide posts, aggravating overall mechanical wear and greatly increasing maintenance workload.

Third, production costs keep climbing. Continuous air loss forces air compressors to run under heavy load for long hours, pushing up electricity bills. Sealing rings, air hoses and valves need more frequent replacement, raising costs for spare parts and equipment maintenance.

Fourth, production line capacity is restricted. Air leakage extends single-cycle time and cuts hourly output. Unstable air pressure triggers frequent jamming and alarms, forcing operators to halt production repeatedly for troubleshooting and wasting man-hours. Hidden slow air leaks are hard to detect; prolonged faulty operation easily leads to mass scrap and waste of molding sand and molten iron. 

Fifth, hidden safety and environmental hazards exist in workshops. Leaking air stirs up excessive dust and worsens the working environment. Damaged high-pressure air hoses may scratch operators, and persistent leakage generates excessive noise that endangers workers’ health.

Delin Intelligent Technology Co., Ltd. specializes in the R&D and manufacturing of fully automatic horizontal parting molding machines. Equipped with self-developed patented hydraulic systems, our machines deliver stable operation and lower energy consumption. We adopt well-known brand components and standardized assembly processes for complete machines. The company has established a full-process quality control team and a comprehensive after-sales service system to fully reduce customers’ operation and maintenance pressure. 

In conclusion, air leakage of molding machines cannot be ignored. Workshops shall implement regular air leakage inspection and maintenance to eliminate leakage faults timely, stabilize production and cut overall operation losses.