The role of the bell furnace The hood furnace is a heat treatment furnace in which the furnace body is a hood, or the furnace bottom does not move, and the furnace hood moves, or the furnace hood does not move and the furnace bottom moves. It is used for batch heat treatment of workpieces.Vacuum heat treatment process of 40Cr steel The traditional bell furnace uses nitrogen-hydrogen mixed gas as the protective medium. Compared with nitrogen, hydrogen has the advantages of good thermal conductivity, low density, low dynamic viscosity and strong reducibility, and gradually replaces the nitrogen-hydrogen mixed gas as the protective gas. At the same time, it puts forward more stringent requirements for the safety control of bell furnaces.Degreasing Process in Ceramic Injection Molding First of all, the metal shell of the protective cover and the furnace table are all tested by X-ray to strictly ensure the processing quality of each equipment. Second, at the beginning of the annealing cycle, check all gauges and switch positions so that they are in the correct setting. After the inner cover is fastened on the prepared furnace table, the leakage test of the hydrogen inlet valve is carried out, and then the leakage test of the furnace table space is carried out to ensure that the furnace table and the inner cover system are completely sealed. Each device conducts a rigor test. After passing the leak test, purge the furnace space with nitrogen. Nitrogen purging must meet three conditions to end, a certain amount of nitrogen purging, and the minimum nitrogen purging time: the oxidation content is less than 1%.Vacuum Heat Treatment Process Prevention of Cemented Carbide Tool Cracks Bell furnaces are mostly used for the annealing treatment of steel wires, steel pipes, copper strips, copper wires and silicon steel sheets in the metallurgical industry. Among them, copper strips are mainly suitable for heat treatment of brass strips, bronze strips, special-shaped copper strips, red copper strips and other materials.