Vacuum brazing furnace is mainly used for stainless steel, copper, titanium alloy, high temperature alloy, cemented carbide, diamond tools, insulation cup (pot), aluminum radiator, air conditioning evaporator, condenser, radar grid antenna, wave guide, etc. Vacuum brazing. Typical brazing products include various stainless steel plate heat exchangers, EGR (Exhaust Gas Recirculation System), diamond tools, optical instruments, etc. If the vacuum brazing furnace fails to cause brazing problems, which directly affects the quality and effect of the workpiece, the following briefly introduces how to troubleshoot the vacuum brazing furnace where the air is leaking and repair it:
1. First check with a leak detector to see if there is any gas leakage. If the protection valve at the vacuum gauge is leaking after leak detection, replace the valve;
2. Check the wear of the bearing. If the wear is severe, replace the bearing;
3. If the main valve stem seal, pre-exhaust valve, bleed valve, pneumatic ball valve and furnace door seal have different degrees of air leakage after inspection, you need to check whether the main valve stem seal and the furnace door large ring seal There is aging or cracks. If there is severe aging or cracks, it will cause air leakage, so replace the corresponding sealing ring. The sealing ring can be made of fluorine rubber material that is resistant to high temperature and various media;
4. If there is no problem in the above inspection, then you can perform a leak detection on the thermocouple metal head. Because the leak detection time is relatively long, if there is a very small leak near the thermocouple metal head, it is easy to be neglect. For this, a special method should be adopted: first wrap the seal of the even wire with a plastic bag, and then pass helium into the plastic bag for leak detection. After testing by the above methods, if there is air leakage at the thermocouple's own seal, a new thermocouple should be replaced.
5. Finally, check the inflation group valve according to the maintenance plan. If there is an air leakage problem in the supplementary valve in the inflation group valve, the valve should be replaced.
After the vacuum brazing furnace undergoes the above-mentioned leak detection and maintenance, start the evacuation system to evacuate the furnace, check whether the data of the ultimate vacuum degree and the pressure rise rate meet the requirements, and then use the test product for brazing, if the test product brazing results are normal , It can be used normally.
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