Improvement of carburizing and quenching process for 20Cr2Ni4A steel steering gear
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针对20Cr2Ni4A钢齿轮渗碳淬火后椭圆度、平面翘曲度过大的问题,基于有限元模拟方法,对渗碳淬火装炉方式,机加余量和淬火压力进行优化,并进行了试验验证.结果表明,装炉方式、机加余量和淬火压力对转向齿轮渗碳淬火过程应力场和畸变场影响很大,采用吊放装炉比平放装炉畸变更小,腹板厚度增加可以减小畸变,当腹板增厚至18 mm,渗碳后椭圆度能控制到0.19 mm.压淬外环压力为3 MPa时,淬火后椭圆度能控制到0.16 mm.
Aiming at the problem of excessive plane warping of 20Cr2Ni4A steering gears after carburizing and quenching,the optimization of the pressure quenching process was guided by finite element simulation carburizing and quenching simulation,and experimental verification was carried out.The results show that the loading method,machining allowance,and quenching pressure have a significant impact on the stress and distortion fields during the carburization and quenching process of the steering gear.The distortion is smaller when using hanging loading than flat loading.Increasing the thickness of the web plate can reduce the distortion.When the web plate thickens to 18 mm,the ellipticity after carburization can be controlled to 0.19 mm.When the outer ring pressure of pressure quenching is 3 MPa,the ellipticity after quenching can be controlled to 0.16 mm.
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