Standard process specifications for silicone rubber heater production line (Part 2)

10. Annealing 1. Whether annealing is passed, the main annealing method and temperature are in accordance with the requirements of the production order; a. Copper tubes and annealing oxygen welding flames are annealed at a temperature of about 400℃, and the annealing color is dark red; b. Carbon steel pipes and stainless steel pipes can use a larger local annealing machine. Cabinet dehumidification heater In recent years, due to the greenhouse effect, the temperature has risen year by year, and the atmospheric environmental factors have gradually deteriorated. The changing climate such as high temperature and high humidity has made the threats faced by indoor power distribution facilities more and more obvious. The electric vehicle battery heater uses the heat energy generated by the auxiliary heater to heat the battery pack, which will not consume the battery power, so it will not affect the power and cruising range of the electric vehicle. At the same time, it can also ensure the heat required by the air conditioning system. The vehicle controller distributes heat by controlling the opening of each electric control valve, and the control method is simple. The livestock water tank heater is specifically a larger livestock water tank heating system. The temperature of carbon steel pipe concrete is about 500℃, and the color is medium red during annealing. The temperature of stainless steel pipe is about 700℃, and the color is slightly white during annealing. 2. When the electric furnace is used for controlled annealing, the tubes shall be placed evenly in the furnace, and the annealing time shall not be uneven due to crowding.Work clamps and measuring tools and equipment: annealing furnace, local annealing furnace, oxygen welding equipment, bending pipe 1. Cut the exposed length of the lead rod according to the production order, grind off the damaged thread at the cut or chamfer, and chamfer 0.5×45℃ to ensure that the thread can be screwed in smoothly; 2. The tube shall be bent and formed according to the drawing or sample. Not only shall the appearance of the tube be free of obvious mechanical scratches or local expansion, but there shall be no wrinkles, bumps, etc. at the bending part; 3. The bending radius is generally less than 3 times the diameter of the tube and is not completely annealed. It should be ensured that the tube weld has no direction to the inner R (not easy to break); 4. The self-inspection capability is the main thing, and the inspector shall conduct the first inspection and random inspection.Work clamps and measuring tools and equipment: bending fixture, bending machine, hydraulic press, punching machine, grinding wheel machine, caliper, angle ruler, tape measure. 12. Welding 1. When brazing flange or quick-connect plate parts is required, the brazing parts must be more secure, safe and reliable; 2. For heating working liquid or environmental closed system components, it should be able to withstand 0.3-1.2MPa pressure. There is no leakage during the 5mm static water surface pressure factor test. Work clamps and measuring tools and equipment: oxygen welding equipment, various welding rods. 13. Sealing 1. When sealing is required, it should be carried out according to the production order; 2. Dig out 3-4mm depth of MgO powder at both ends and clean it. It is particularly worth noting that the inner wall and threaded components of the pipe should not have magnesium powder reaction; 3. The inspection method before sealing is to ensure that the components have a withstand voltage of 2000V/1s, no breakdown flashover, and infinite insulation quality; 4. When entering the sealing glue, the magnetic plug should be rotated and pressed, and then the nut and gasket should be installed; 5. The materials of the electric heat conversion components of the two ports should be implemented according to the actual operation technical regulations. 14. Surface data processing 1. According to the social production order, decide whether you will affect the type of surface analysis and surface problem processing; 2. The coating layer is required to be uniform, smooth, without blistering, peeling and local tissue accumulation; 3. The lead rod shall not be directly damaged (corroded) during pickling; 4. Pre-calculation and processing provide the surface to be processed after cleaning. Especially glue, oxidation to form spots, etc. 15. Final inspection 1. Insulation: infinite, lasting 10s; 2. Withstand voltage: φ16 or more, within 4 meters in length, 3000V/10s; φ10~φ8, within 4 meters in length, 2000V/10s; φ6. Within 2 meters in length, 1800V/10s; No breakdown flashover phenomenon 3. Cold resistance: meet the requirements of China's production order; 4. Appearance function inspection, geometric model shape and size should meet the requirements of my country's product development; The above is a piece-by-piece inspection. 5. For each batch of food, 5% of the current caused by leakage shall be sampled; the current density of leakage utilization shall be less than 0.5mA; 6. For each batch of hot insulation, 5% shall be sampled; at the same time, students shall observe the patient's fever for uniformity. Within 1 minute after power failure, the hot insulation shall be >=2MΩ, and after rapid cooling for 1 hour under natural economic conditions, the insulation shall be restored to more than 100MΩ. Work clamps and measuring tools and equipment: automatic air breakdown test device, digital resistance meter, leakage meter, caliper, tape measure, steel ruler, flat plate.