Automobile steering piston waste heat normalizing process

Abstract

The invention belongs to the technical field of automobile parts precision processing, and particularly discloses an automobile steering piston waste heat normalizing process which comprises the working procedures such as medium frequency induction heating, multi-directional controllable distributing and forging forming, axial flow fan cooling, infrared temperature measurement and isothermal normalizing. According to the automobile steering piston waste heat normalizing process provided by the invention, on the premise of ensuring the product quality, forging waste heat is sufficiently utilized, so that the effective utilization of energy is realized, the energy consumption can be reduced by about 25%, the processing cycle of the product is shortened, a fine and uniformly distributed ferrite+pearlitic structure is obtained, the structure is small in stress and uniform in hardness distribution, and the automobile steering piston waste heat normalizing process is suitable for a precisionforging automatic production line and industrial batch production, and has good consistency and stability.

Description

technical field [0001] The invention belongs to the technical field of precision machining of auto parts, and in particular relates to a waste heat normalizing process of an auto steering piston. Background technique [0002] At present, the main processing process of automobile steering piston is: blanking - medium frequency induction heating - forging - normalizing - machining - carburizing and quenching - finishing - inspection - assembly and use, which includes intermediate frequency and normalizing in the process of forging processing The two heating processes, in today's energy saving and emission reduction, how to combine the two processes of forging and normalizing to effectively use the waste heat of forging, save energy and shorten the production cycle has become a necessity and a trend. [0003] At present, there are generally two ways to use forging waste heat in China: Method 1 is to control the final forging temperature to make the forging above the normalizing...

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Problems solved by technology

[0003] At present, there are generally two ways to use forging waste heat in China: Method 1 is to control the final forging temperature to make the forging above the normalizing temperature (A C3 or A CM Above 30°C-50°C) to complete the forging process, and use the forging waste heat to complete the normalizing process in the holding furnace; for volume-forming forgings, because the residence time in the austenite area is short, and the cooling process is non-uniform cooling, the forgings are in the In this process, the legacy effect caused by forging cannot be fully eliminated. After normalizing, forgings are prone to mixed crystals, hardness and uneven stress distribution in the structure, which is not conducive to heat treatment deformation in the later machining and carburizing and quenching processes; 2: Put directly into the furnace after forging, and reheat to complete the normalizing process. In this way, due to the uneven cooling of various parts before entering the furnace or the high temperature of the furnace, the forgings are prone to mixed crystals, coarse grains, and Widmanstatten structures after normalizing. etc., and the hardness distribution is uneven; because the automobile steering piston is a safety part of the automobile steering system, its quality stability plays an important role in the safety system of the whole vehicle. At present, the piston forging needs to be cooled to room temperature after forging, and then Furnace loading isothermal normalizing, lack of connection between processes, high production cost of forgings, high labor intensity of employees

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