How to safely operate a vapor deposition furnace?
Oct 18,2024
Vapor deposition furnace is the use of induction heating protective baking furnace to be heated, can be divided into frequency, medium frequency, high frequency and other types, can belong to the sub-category of vacuum baking furnace. Vapor deposition furnace is in vacuum or atmosphere, the use of medium frequency induction heating principle sintering hard alloy cutter head and a variety of metal powder pressing parts of complete sets of equipment, for hard alloy, metal dysprosium, ceramic materials and industrial production and design, then how to safe operation of vapor deposition furnace?
1. Intermediate frequency power supply, vacuum furnace body, induction wheel cooling water source-the water in the reservoir must be full, and there must be no impurities in the water.
2. Start the pump to make the water circulation of the intermediate frequency power supply, the induction ring of the vacuum furnace and the cooling system of the furnace body normal, and the water pressure is controlled at the specified value.
3, check the vacuum pump power system, seat belt tightness, vacuum pump oil is in the center line of the oil seal observation hole. After the inspection, manually rotate the vacuum pump screw thread. If there is no abnormality, the vacuum pump can be started with the butterfly valve closed.
4. Check the situation in the vacuum furnace. It is required that the first-class sanitation in the vacuum furnace, the induction coil insulation is good, the vacuum sealant is elastic, and the size is qualified.
5. Check whether the lever handle of the vacuum furnace body is flexible.
6. Check whether the rotary Macquarie vacuum gauge meets the requirements.
7. Check whether the graphite crucible and furnace fittings are complete.
8. The above is ready. Start the intermediate frequency. Try to start the frequency conversion according to the intermediate frequency starting rule. Stop the frequency conversion after success before starting the furnace.
9. The observation and temperature measurement holes of the upper cover of the vapor deposition furnace body shall be cleaned and observed and measured each time the furnace is opened.
10. When entering the furnace, the appropriate furnace method should be adopted according to the different sintered products. Tray loading shall be carried out in accordance with the relevant provisions for material loading, and shall not be changed without authorization.
11. In order to maintain a constant temperature and prevent heat radiation, the heating crucible is wrapped with two layers of carbon fiber and covered with a heat shield.
12. Spread vacuum sealing tape.
13. Operate the pull rod handle, rotate the top cover of the vacuum furnace and the furnace body closely, lower the top cover, and tighten the lock nut.
14. Gradually open the butterfly valve and release the air of the furnace body until the vacuum degree reaches the specified value.
15. After the vacuum degree reaches the specified requirements, start frequency conversion, adjust the intermediate frequency power, and operate according to the relevant material sintering regulations; heat up, heat preservation and cooling.
16. After sintering, stop the frequency conversion, press the frequency conversion stop switch, stop the frequency converter, and cut off the intermediate frequency power supply and the total power supply.
17. After observing the blackening of the furnace through the observation hole of the furnace body, cut off the butterfly valve of the vacuum pump and the current of the vacuum pump, connect tap water to continue cooling the induction ring and the furnace body, and stop the pump.
18. The medium frequency voltage is 750 volts and there is a danger of electric shock. During the entire operation and inspection process, pay attention to safe operation and do not touch the intermediate frequency control cabinet.
19. During the sintering process, observe whether there is arc discharge in the induction ring through the observation hole on the side of the furnace body at any time, and report any abnormal phenomenon to relevant personnel for treatment in time. 20. The vacuum butterfly valve moves slowly. Otherwise, the exhaust will be too urgent oil, bring adverse consequences.
21, if the incorrect use of rotary McNair vacuum gauge, may cause vacuum reading error, or the operation is too fast, overflow, causing pollution.
22. Pay attention to the safe operation of the vacuum pump tape.
23. Spread vacuum sealing tape and be careful not to push hands when closing the top cover of the furnace body.
24. Under vacuum conditions, workpieces or containers that are volatile, affect vacuum hygiene, cause pipeline blockage, and vacuum pump pollution are not allowed to enter the furnace.
25. When there is a forming agent (such as oil or paraffin) in the product, it must be taken off before it can be sintered in the furnace. Otherwise, it may lead to adverse consequences.
26. During all sintering processes, pay attention to the pressure range of the water meter and the circulation of cooling water to avoid accidents.
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