During the vacuum coating process of the PVC vacuum coating machine
During the vacuum coating process, the surface cleaning of the plated parts is very important. Basically, all the substrates must go through the pre-plating cleaning process before being loaded into the coating vacuum chamber to achieve degreasing, decontamination and dehydration of the workpiece.
The main sources of surface contamination of plated parts are: dust, sweat, grease, polishing paste, engine oil and lubricating oil will adhere to the processes such as processing, transmission, and packaging; gas adsorbed and absorbed on the surface of equipment parts; coating in humid air The oxide film formed on the surface of the machine parts. For pollution from these sources, most of the pollutants can be removed by degreasing or chemical cleaning methods.
So while using it, how do we take care of it and take good care of it so that it can live longer?
Generally, the diffusion pump has been used continuously for more than 6 months, the pumping speed is obviously slow, or the operation is improper, fill the atmosphere, remove the connecting water pipe, remove the electric stove plate, unscrew the first-stage nozzle, first use gasoline to pump the pump cavity and the pump bladder Clean it again, then wash with detergent and water, and then rinse thoroughly with water. After the water evaporates, install the pump, add new diffusion pump oil, and install it back to the body, connect the water pipe, and install the electric hob. , The vacuum coating equipment can be restarted. Before restarting, pay attention to leak detection.
The method is: start the maintenance pump and close the door. After a few minutes, observe whether the vacuum degree of the diffusion pump reaches 6X10 Pa. Otherwise, leak detection is required. Check whether the joint is equipped with a sealing rubber ring, or the sealing ring is crushed. Heat up after removing the hidden danger of air leakage, otherwise the diffusion pump oil will burn the ring and the vacuum coating equipment cannot enter the working state.
The method is: repeatedly scrub the inner wall of the vacuum chamber with a saturated solution of caustic soda (NaOH), (note that the human skin can not directly contact the caustic soda solution to avoid burns) The purpose is to make the coated film material aluminum (AL) react with NaOH. The layer falls off and releases hydrogen. Then clean the vacuum chamber with clean water and clean the dirt in the fine suction valve with a cloth dipped in gasoline.
When the rough pump (spool valve pump, rotary vane pump) works continuously for one month (half in the rainy season), new oil needs to be replaced.
The method is: unscrew the oil bolt, drain the old oil, and then start the pump for a few seconds to completely drain the old oil in the pump. Tighten the oil plug and add new oil to the rated amount (observed by oil sight glass). After using for more than half a year, the oil cap should be opened when changing the oil, and the dirt in the tank should be wiped with a cloth.
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