Publish Time: 2026-07-15 Origin: Site
Molding machines use compressed air to drive processes including vibration compaction, squeeze compaction, pattern stripping and flask closing. Air leakage in the pneumatic circuit triggers cascading losses in five aspects: casting quality, equipment wear, production cost, production efficiency and on-site safety.
First, sharply increased casting scrap rate. Insufficient air supply to cylinders creates uneven and loose sand mold hardness. Molds are prone to sand expansion and molten 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 flask misalignment. Jamming of sand hoppers and flask turnover mechanisms results in inconsistent mold thickness and poor dimensional uniformity of mass-produced castings.
Second, accelerated equipment wear and frequent shutdowns for maintenance. Low-pressure operation speeds up aging and abrasion of cylinder sealing rings, forming 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, rising production costs. Continuous air loss forces air compressors to run under heavy load for long hours, pushing up electricity bills. Sealing rings, air hoses and valves require more frequent replacement, raising costs for spare parts and equipment maintenance simultaneously.
Fourth, restricted production line capacity. Air leakage extends single-cycle operation 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 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 for stable operation and lower energy consumption. Well-known brand accessories are adopted for all machines with standardized assembly processes.The company has established a full-process quality control team and comprehensive after-sales service system to fully reduce enterprises’ operation and maintenance pressure.
In conclusion, air leakage hazards 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.