Auxiliary heating method for isothermal forging die

Abstract

The invention discloses an auxiliary heating method for an isothermal forging die. According to the auxiliary heating method, in a conventional isothermal forging die heating furnace, a die is heatedfrom the external part of the die, and an auxiliary heating device is adopted to heat the die from the cavity of the die, so that the die temperature gradient is lowered when the die is heated from the external part, the thermal stress and tearing tendency of the die are reduced, and the actual temperature of the die cavity is ensured to meet the forging technological requirements; and in addition, due to portability and selective flexibility of the heating layer number (power), additional heating can be carried out on the die cavity to compensate heat loss and heat reduction caused by repeated opening and closing of a die furnace. The auxiliary heating device adopted by the method is flexible and portable, and simple and convenient in mounting and using, ensures the temperature of the diecavity, solves the problems that a forge piece rim cracks and is abnormal in texture due to excessively low die cavity temperature and increases the yield and the economic benefit.

Description

technical field [0001] The invention relates to an auxiliary heating method for an isothermal forging die, which belongs to the technical field of forging heating. Background technique [0002] A powder superalloy disc forging for a certain type of aero-engine is a disc forging whose rim is tilted to a certain height and is higher than the spoke plate. It is prepared by AA atomization powder production + hot isostatic pressing (HIP) + isothermal forging (HIF) Routing. Because of the high degree of alloying of the powder superalloy used, the hot forming performance is extremely sensitive to temperature, and the processing window is narrow, the requirements for the execution of the isothermal forging process are very strict. [0003] The forging forming temperature of the forging is 1050-1100°C, and the atmosphere temperature of the mold heating furnace is required to be 1050-1070°C. However, the existing domestic atmospheric environment near-isothermal forging technology ge...

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Problems solved by technology

However, the existing domestic atmospheric environment near-isothermal forging technology generally adopts the upper and lower split mold heating furnaces, which are covered on the periphery of the isothermal forging mold and simply fixed on the upper and lower mold bases to heat the isothermal forging mold. The efficiency is low. For isothermal forging molds with deep cavity and thick wall thickness, the mold cavity cannot be heated effectively, resulting in the actual temperature of the mold cavity being far lower than the temperature required by the process. Generally, it is only 1000°C to 1020°C. Moreover, during the isothermal forging process, the atmosphere temperature of the mold furnace returns very slowly, and at the same time, the rim of the disc forging is tilted and higher than the forging structure of the spoke plate, which determines that the alloy rim is always subject to circumferential tensile stress when filling the shape, resulting in disc forging. The rim part is easy to crack, which affects the appearance integrity and internal structure of the disc forging, and serious cracks cause the disc to be scrapped directly

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