Interactive combined heat treatment technology of 42CrMo crankshaft forging blank for diesel vehicle
An interactive, diesel vehicle technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as cracks, abnormal crankshaft wear, abnormal running noise, etc., to achieve the effect of clear process lines
Inactive Publication Date: 2018-03-23
JIUJIANG UNIVERSITY
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Problems solved by technology
[0007] The purpose of the present invention is to provide an interactive combined heat treatment process for 42CrMo crankshaft forging blanks for diesel vehicles, which solves the problems of early abnormal wear, bending and torsion deformation, abnormal running noise, cracks and even breakage in severe cases of automobile crankshafts. question
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[0017] A kind of interactive combined heat treatment process of 42CrMo crankshaft forging billet for diesel vehicles, such as figure 1 , figure 2 As shown, the process includes the following steps:
[0018] (1) Before the conventional quenching and tempering treatment of 42CrMo crankshaft forging blanks for vehicles, a normalizing heat treatment process is added as a preheating treatment. Keep warm for 0.5h;
[0019] (2) The crankshaft after the normalizing heat treatment is then subjected to the final quenching and tempering treatment. The quenching and tempering treatment includes quenching and high temperature tempering. The quenching plan is to start heating at a heating rate of ≤60°C / h, and keep it warm for 0.5 to about 600°C. h, then continue heating at a heating rate of ≤100°C / h, to 860°C, and quench with quenching liquid after holding for 1.5 hours; the tempering scheme is selected as heating to 580°C at a heating rate of ≤60°C / h, and holding for 5 hours Air coolin...
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Disclosed is an interactive combined heat treatment technology of a 42CrMo crankshaft forging blank for a diesel vehicle. The interactive combined heat treatment technology comprises the following steps that before conventional hardening and tempering treatment of the 42CrMo crankshaft forging blank for the vehicle, a once normalizing heat treatment technology is added as preheating treatment, thenormalizing heat treatment technology is chosen as 880 DEG C * 1h air cooling, and heat preservation is conducted for 0.5 h when the temperature rises to 550 DEG C; and then final hardening and tempering treatment is conducted on a crankshaft after normalizing heat treatment, and the hardening and tempering treatment comprises hardening and high-temperature tempering. According to the interactivecombined heat treatment technology, once normalizing heat treatment is added, the specific heating rate, the heat preservation time and the like are given before normalizing treatment and hardening and tempering treatment are implemented, and a technology line is clear and concrete (heat preservation time periods are added during normalizing and quenching, and the heat preservation time is prolonged to 5 hours during tempering); and thus a treatment mode of normalizing + hardening and tempering is adopted, and finally, the structure and performance of the crankshaft are obtained, the nationalrelevant evaluation criteria is met, and the most important thing is to meet the comprehensive mechanical properties, vehicle driving requirements and crankshaft life requirements of a final productof the crankshaft of the diesel engine.
Description
technical field [0001] The invention relates to an interactive combined heat treatment process for a 42CrMo crankshaft forging billet for a diesel vehicle. Background technique [0002] The crankshaft is one of the most critical components of a car engine, and its manufacturing cost accounts for 10-20% of the engine. The crankshaft is subjected to constantly changing gas pressure, inertial force and moment during work, resulting in alternating stresses such as bending, torsion, shearing, tension and compression in each part, and its service conditions are very harsh. The performance of the crankshaft affects the reliability and life of the automobile engine to a large extent, so the crankshaft is required to have high tensile strength, fatigue strength, surface strength, wear resistance, and at the same time, the core must have a certain degree of toughness. Under the premise of relevant national standards, in addition to scientific material selection, how to scientifically...
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IPC IPC(8): C21D9/30C21D1/28C21D1/18
CPCC21D9/30C21D1/18C21D1/28
Inventor 李永志李悦于福义李依玮
Owner JIUJIANG UNIVERSITY