Hidden damage of water and oil content in the compressed air pipeline of casting molds to spraying and vacuum systems | Workshop air source treatment
Compressed air contains excessive amounts of water and oil, resulting in poor atomization of 40% release agent, rapid failure of vacuum filter element, and poor fluctuation of pores.
Compressed air with a moisture content greater than 0.3g/m ³, mixed with a release agent spray gun, causes foaming of the film layer, and introduces water vapor into the mold cavity to generate hydrogen gas pores.
The oil content in the gas source is greater than 0.1ppm, and the oil is mixed with the release agent. High temperature carbonization forms stubborn carbon black spots and inclusions.
The vacuum circuit air source carries water, and water vapor adheres to the filter element. Dust and sludge mix, and the clogging speed of the filter element is increased by three times.
No back-end drying and filtering unit, temperature difference between day and night, continuous condensation of liquid water inside the pipeline, intermittent spraying into the mold cavity.
Spraying, vacuum, and instrumentation share one air source, causing pollution in one area and affecting the synchronization of the entire system.
Low pressure die-casting molds (LPDC), reverse pressure casting molds (CPC), differential pressure casting molds for wheel hubs, low-pressure casting molds for wheel hubs, gravity casting molds, motorcycle wheel hub casting molds, structural component casting molds, aluminum alloy wheel hub molds, aluminum casting forming molds, low-pressure casting tooling molds. Many customers attribute all defects to molds and ignore the quality of the front-end air source. Recommended gas source configuration for Zhejiang Xinfeng Machinery: air compressor → refrigerated dryer → precision oil removal filter → gas storage tank → branch filtration; Spray painting and vacuum system independent branches, equipped with terminal water and oil filters. Gas source standard: atmospheric dew point ≤ 3 ℃, oil content ≤ 0.1ppm. In the humid coastal areas of the Middle East and high humidity areas during the rainy season, gas supply issues are the primary cause of seasonal batch defects, with a significant increase in defect rates during the rainy season. Google keyword 'low pressure casting compressed air dryer release agent'.
FAQ
1. Question: What is the warning value for water content in compressed air?
Answer: If it exceeds 0.3g/m ³, the risk of porosity and mold release film defects increases.
2. Question: What is the upper limit of oil content control for gas sources?
Answer: ≤ 0.1ppm, to prevent carbon black spots from being mixed in.
3. Question: What is the recommended gas source processing link?
Answer: Cold dryer+precision oil removal filtration+air storage tank+terminal branch filtration.
4. Question: Is it recommended to share a gas source for spraying and vacuum?
Answer: Prioritize independent branches to avoid mutual pollution and interference.
5. Question: What are the typical phenomena in coastal high humidity workshops?
Answer: During the rainy season, there is a periodic rebound of poor stomata.
6. Question: How does the liquid water in the pipeline come from?
Answer: As the air cools down, saturated water vapor condenses into liquid water.
