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The sealing cover (furnace cover) of the electric heating reverberatory furnace only bears the pressure of the gas, and the structure is relatively simple. Vacuum carburizing process of auto parts However, the No. 7 part in the sealing cover of the resistance heating furnace has poor working conditions and strict requirements. It needs to be sealed with the crucible; at the same time, it must be sealed with the riser; during pressure maintenance and pouring, it needs to be sealed with the casting mold. Tightly fit and withstand the impact of the weight of the mold and the opening and closing mechanism. Shaft machining vacuum heat treatment Therefore, the sealing cover must meet the following requirements: first, it is not easy to deform under the action of external force and heat, and the sealing performance is good; second, the temperature of the joint part with the riser pipe is easy to control; third, it is easy to assemble and fasten. The sealing cover material is generally cast with ductile iron or gray iron, and should not be made of steel. Vacuum carburizing process of auto parts

1. Start the heating furnace: 1. Preparatory work before ignition Differences in vacuum heat treatment between aerospace blanks and parts (1) Wear labor protection supplies, and bring cotton yarn and adjustable wrench for backup. Step shaft vacuum quenching heat treatment (2) Check the connection points of each part of the gas supply pipeline to ensure that the screws of each part are fully tightened, each gate switch is agile, and the gas supply valve should be in an open state. High speed steel vacuum heat treatment (3) The level gauge should be clean, complete and clear. (4) The safety valve must be intact and sensitive within the validity period, and the set pressure is 0.1MPa. (5) Check the pressure gauge to ensure that the display is sensitive and accurate within the validity period.