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The use of multi-purpose furnace Several Experience


4 crucial. Because rail is good or bad will affect whether the feed pan in the furnace to resume normal access. Generally heat-resistant steel sliding, heat-resistant steel and silicon carbide roller sliding. I plant a larger multi-purpose furnace load, using the heat-resistant steel roller guide structure. Pin with cylindrical high-strength ceramic materials. To prevent carburization and increase resistance to bite performance, life and nearly 6 years. (2) as a heating electric radiant tube should have anti-oxidation, high temperature corrosion resistance and adequate mechanical properties. Large thermal conductivity. Coefficient of thermal expansion, resistant to high temperature and other characteristics of temperature fluctuations. I plant the radiant tube material for the jacket tube made of heat resistant steel casting. Thickness of 7111,113,[link widoczny dla zalogowanych], proven to be durable. Radiant tube is mainly the failure of radiation damage to the core pipe. Our experience is that every time the radiant tubes must turn 180. , While cleaning house. To prevent possible oxidation of the skin caused by short circuit. In addition to prevent voltage fluctuations caused by the voltage is too high, too fast and cause the heating wire heating due to high temperature burn, we installed a high-power voltage regulator, thereby reducing the occurrence of such problems. 4 Other (1) open hearth must ensure that all gas and liquid reserves the required number of valves, pipes leak, if that gas distribution system shall not be open furnace is not working properly. (2) equipment in operation. Observed at any time set fire to the fire and the combustion exhaust, monitoring appliances, air pressure, temperature, water temperature, oil temperature and the working medium gases. Liquid flow meter indication is normal, identify problems and timely treatment. (3) only when the temperature higher than 760 ℃,[link widoczny dla zalogowanych], can the flammable gas,[link widoczny dla zalogowanych], liquid or clear Walter furnace furnace atmosphere, which would result. (4) when the temperature above 150 ℃, under no circumstances shall not interrupt the water on and off the stove fan and oil cooling pump. (5) Under normal circumstances, the use of heaters should ensure continuous operation, to minimize the shutdown,[link widoczny dla zalogowanych], short break furnace is not cool (800 ℃ heat) is less a failure to maintain equipment, an important experience. Tin (Continued from page 6 7 or 10 oil, increase the cooling capacity. The oil cooling rate, permeability and lubrication are better than water and water-based solution. While increasing the flow of coolant. Recommended 300L/min. Tropical grinding can go to the greatest extent, reduce the heat transmission of the workpiece. (2) selection of lower hardness, grain size coarse grinding wheel, grinding wheel helps maintain sharpness. Can reduce the grinding heat and thermal stress. (3) the use of single grain diamond grinding wheel or diamond wheel dressing to improve the sharpness of the wheel. Grinding teeth at the time. Increase in the number of wheel dressing. (4) increase the speed wheel stroke, reduce the grinding wheel and workpiece contact time, thereby reducing the tooth surface of the grinding temperature. Reduce heat transmission of the workpiece. (5) generating method grinding teeth, the selection of the exhibition into a lower speed and reduce development into the feed. To reduce the grinding heat. (6) to sub-rough grinding, fine grinding, the coarse grinding wheel used coarser soft (46) for strong grinding; then use the fine granularity of the grinding wheel (60) for fine grinding. (7) has just released the workpiece, the workpiece must be naturally cooled to room temperature before the grinding. If time permitting. Best to let the natural aging the workpiece 1 to 2 months. Stress relief after the grinding. It will also receive very good results. 3.2 The heat treatment process measures are to have the root cause of grinding crack is quenched martensite pieces of the state in the expansion, there is stress there is, to reduce and eliminate this stress, tempering should be carried out to stress. Immediately after the quenching and tempering. The first piece in the fast grinding crack is heated to about 100 ℃ and cooling rapidly produced,[link widoczny dla zalogowanych], so. To prevent the generation of the first grinding cracks, the workpiece should be about 150 ~ 200 ℃ tempered. The second piece in the grinding grinding crack is to continue to heat up to 300 ℃, the surface contraction arising again. Therefore, in order to prevent a second grinding cracks, the workpiece should be tempered at about 300 ℃. Annealing time must be more than 4h. It should be noted that tempering at 300 ℃ when the workpiece hardness of the workpiece will fall. Also produced the first category temper embrittlement. Sometimes not be used. Sometimes tempered by a possible after grinding cracks. Then a second can be tempered or artificial aging. This method is very effective. 4 Conclusion The use of such a re-group process measures. 3500 Nanjing Steel has completed the synchronization gear flying shear, flying shear Benxi synchronous gears, hardened gears and SWA Zunhua rolling mill main drive gear box 900 gear grinding process. Gear tooth surface roughness after grinding up Ra0.8 below. And by the color detection check. Tooth surface cracks and crack-free bar. This technology effectively prevents tooth grinding cracks, with good results. Tin ((HEAT TREATMENT \
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