CN114836613A - 一种锻后余热等温正火细晶齿轮制备方法 - Google Patents
一种锻后余热等温正火细晶齿轮制备方法 Download PDFInfo
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Abstract
本发明公开了一种锻后余热等温正火细晶齿轮制备方法,包括锻造成型、余热等温正火、机加工、渗碳淬火和低温回火,具体步骤包括:先将齿轮钢加热至1200~1250℃,保温后进行锻造成型,并控制终锻温度在1050~1100℃;接着利用风冷或雾冷控制冷却,将锻造成型后的齿轮冷却至550~650℃,保温后空冷至室温;之后进行机加工,待机加工结束后将齿轮加热至900~940℃进行渗碳,渗碳结束后冷至820~860℃,保温后淬油冷却,最终进行低温回火,随后空冷。本发明通过充分利用齿轮锻后余热进行等温正火工序,有利于降低生产成本和获得组织均匀细小的齿轮钢。
Description
技术领域
本发明涉及一种齿轮制备方法,尤其涉及一种锻后余热等温正火细晶齿轮制备方法。
背景技术
现有的渗碳齿轮钢在锻造成型后通常需要进行等温正火、渗碳等工序,其中齿轮的渗碳温度低、渗碳时间长,为了缩短时间通常需要提高齿轮的渗碳温度,而在高温下齿轮钢的奥氏体晶粒会发生明显长大,导致最终齿轮的强度、塑性及韧性均显著降低。
发明内容
发明目的:本发明旨在提供一种在降低生产成本的同时有利于获得均匀细小组织齿轮钢的锻后余热等温正火细晶齿轮制备方法。
技术方案:本发明所述的一种锻后余热等温正火细晶齿轮制备方法,包括锻造成型、余热等温正火、机加工、渗碳淬火和低温回火,具体步骤如下:
首先将齿轮钢加热至1200~1250℃,保温后进行锻造成型,并控制终锻温度在1050~1100℃;接着利用风冷或雾冷控制冷却,将锻造成型后的齿轮冷却至550~650℃,保温后空冷至室温;之后进行机加工,待机加工结束后将齿轮加热至900~940℃进行渗碳,渗碳结束后冷至820~860℃,保温后淬油冷却,最终在160℃~220℃进行低温回火,随后空冷。通过将上述齿轮钢加热至1200℃~1250℃进行锻造成型,使钢中的微合金元素V、Ti、Nb等充分溶入奥氏体中;并在之后的余热等温正火工序中通过控制冷却速率在2.5~6℃/s,使钢中析出细小、弥散的第二相粒子,同时获得片层间距较小的珠光体和铁素体组织,铁素体含量为40%~70%。
优选地,所述齿轮钢材料为18CrNiMo7-6或20CrMnTi中任意一种。所述18CrNiMo7-6化学成分及质量百分比为:C:0.15~0.20;Si:≤0.40;Mn:0.40~0.60;P:≤0.035;S:≤0.035;Cr:1.50~1.80;Ni:1.40~1.70;Mo:0.25~0.35;V:0.02~0.06;Ti:0.01~0.04;Nb:0.04~0.06;Al:0.010~0.015;N:0.005~0.008;余量为Fe和不可避免的杂质;所述20CrMnTi化学成分及质量百分比为:C:0.17~0.23;Si:0.17~0.37;Mn:0.80~1.1;P:≤0.035;S:≤0.035;Cr:1.00~1.30;Ni:≤0.030;V:0.02~0.06;Ti:0.04~0.10;Nb:0.03~0.06;Al:0.010~0.018;N:0.004~0.008;余量为Fe和不可避免的杂质。
优选地,所述齿轮钢加热后的保温时间为20~60 s;所述渗碳结束后的保温时间为0.5~1 h;所述锻造成型后的齿轮冷却后的保温时间为20min~40min。
优选地,所述风冷或雾冷的冷却速率为2.5~6 ℃/s。
优选地,所述低温回火时间为2~4 h。
本发明通过充分利用齿轮锻后余热进行等温正火工序,使钢中析出细小、弥散分布的第二相粒子,在后续的渗碳淬火阶段能够钉扎晶界、有效阻碍奥氏体晶粒发生长大,同时获得片层间距较小的珠光体和铁素体的平衡组织,最终获得组织均匀细小的齿轮。
有益效果:与现有技术相比,本发明具有如下显著优点:(1)利用锻后余热进行等温正火,能够获得较细化的铁素体+珠光体组织和析出细小、弥散第二相颗粒,在后续齿轮的渗碳淬火工序中细化的铁素体+珠光体组织有利于较快完成奥氏体化,析出的细小、弥散第二相颗粒能够钉扎晶界、阻碍奥氏体晶粒长大,有效细化齿轮晶粒尺寸;(2)利用锻后余热进行等温正火,还具有简化渗碳淬火前的预备热处理工序,避免析出第二相颗粒的熟化长大,同时还有节能降本作用。
具体实施方式
下面结合具体实施例对本发明的技术方案作进一步说明。
实施例1
一种锻后余热等温正火细晶齿轮制备方法,制造工艺流程包括:锻造成型、余热等温正火、机加工、渗碳淬火和低温回火。具体步骤如下:将齿轮钢加热至1200℃,保温30s后锻造成型,之后采用风冷的冷却方式,控制冷却速率在5.5℃/s将锻后齿轮冷至600℃,保温30min后空冷。渗碳淬火阶段将齿轮在920℃进行渗碳,之后冷至840℃,保温45min后淬油冷却,最后在200℃进行回火,回火时间为3h,空冷。齿轮钢采用20CrMnTi,其化学成分,以质量百分比计,C:0.20;Si:0.17;Mn:0.82;P:0.023;S:0.026;Cr:1.10;Ni:0.01;V:0.025;Ti:0.05;Nb:0.032;Al:0.015;N:0.006;余量为Fe和不可避免的杂质。齿轮的最终晶粒度级别在7级左右。
实施例2
一种锻后余热等温正火细晶齿轮制备方法,制造工艺流程包括:锻造成型、余热等温正火、机加工、渗碳淬火和低温回火。具体步骤如下:将齿轮钢加热至1250℃,保温50s后锻造成型,之后采用风冷的冷却方式,控制冷却速率在4℃/s将锻后齿轮冷至620℃,保温35min后空冷。渗碳淬火阶段将齿轮在940℃进行渗碳,之后冷至850℃,保温45min后淬油冷却,最后在200℃进行回火,回火时间为3h,空冷。齿轮钢采用18CrNiMo7-6,其化学成分,以质量百分比计,C:0.16;Si:0.32;Mn:0.45;P:0.005;S:≤0.005;Cr:1.53;Ni:1.46;Mo:0.32;V:0.024;Ti:0.04;Nb:0.043;Al:0.012;N:0.006;余量为Fe和不可避免的杂质。齿轮的最终晶粒度级别在6.5级左右。
实施例3
一种锻后余热等温正火细晶齿轮制备方法,制造工艺流程包括:锻造成型、余热等温正火、机加工、渗碳淬火和低温回火。具体步骤如下:先将齿轮钢加热至1230℃,保温40s后锻造成型,之后采用雾冷的冷却方式,控制冷却速率在3℃/s将锻后齿轮冷至650℃,保温35min后空冷。渗碳淬火阶段将齿轮在940℃进行渗碳,之后冷至860℃,保温60min后淬油冷却,最后在160℃进行回火,回火时间为3h,空冷。齿轮钢采用18CrNiMo7-6,其化学成分,以质量百分比计,C:0.17;Si:0.32;Mn:0.53;P:0.008;S:0.008;Cr:1.56;Ni:1.45;Mo:0.26;V:0.034;Ti:0.032;Nb:0.05;Al:0.013;N:0.006;余量为Fe和不可避免的杂质。齿轮的最终晶粒度级别在6级左右。
实施例4
一种锻后余热等温正火细晶齿轮制备方法,制造工艺流程包括:锻造成型、余热等温正火、机加工、渗碳淬火和低温回火。具体步骤如下:将齿轮钢加热至1220℃,保温35s后锻造成型,之后采用风冷的冷却方式,控制冷却速率在4.5℃/s将锻后齿轮冷至550℃,保温35min后空冷。渗碳淬火阶段将齿轮在930℃进行渗碳,之后冷至850℃,保温60min后淬油冷却,最后在180℃进行回火,回火时间为3h,空冷。齿轮钢采用20CrMnTi,其化学成分,以质量百分比计,C:0.21;Si:0.22;Mn:0.92;P:0.006;S:0.006;Cr:1.21;Ni:0.021;V:0.034;Ti:0.043;Nb:0.052;Al:0.013;N:0.005;余量为Fe和不可避免的杂质。齿轮的最终晶粒度级别在7级左右。
Claims (10)
1.一种锻后余热等温正火细晶齿轮制备方法,其特征在于,包括锻造成型、余热等温正火、机加工、渗碳淬火和低温回火,具体步骤如下:
首先将齿轮钢加热至1200~1250℃,保温后进行锻造成型,并控制终锻温度在1050~1100℃;接着利用风冷或雾冷控制冷却,将锻造成型后的齿轮冷却至550~650℃,保温后空冷至室温;之后进行机加工,待机加工结束后将齿轮加热至900~940℃进行渗碳,渗碳结束后冷至820~860℃,保温后淬油冷却,最终在160℃~220℃进行低温回火,随后空冷。
2.根据权利要求1所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述齿轮钢材料为18CrNiMo7-6或20CrMnTi中任意一种。
3.根据权利要求2所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述18CrNiMo7-6化学成分及质量百分比为:C:0.15~0.20;Si:≤0.40;Mn:0.40~0.60;P:≤0.035;S:≤0.035;Cr:1.50~1.80;Ni:1.40~1.70;Mo:0.25~0.35;V:0.02~0.06;Ti:0.01~0.04;Nb:0.04~0.06;Al:0.010~0.015;N:0.005~0.008;余量为Fe和不可避免的杂质。
4.根据权利要求2所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述20CrMnTi化学成分及质量百分比为:C:0.17~0.23;Si:0.17~0.37;Mn:0.80~1.1;P:≤0.035;S:≤0.035;Cr:1.00~1.30;Ni:≤0.030;V:0.02~0.06;Ti:0.04~0.10;Nb:0.03~0.06;Al:0.010~0.018;N:0.004~0.008;余量为Fe和不可避免的杂质。
5.根据权利要求1所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述余热等温正火后得到的钢材组织为珠光体和铁素体组织,铁素体含量为40%~70%。
6.根据权利要求1所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述齿轮钢加热后的保温时间为20~60 s。
7.根据权利要求1所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述风冷或雾冷的冷却速率为2.5~6 ℃/s。
8.根据权利要求1所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述渗碳结束后的保温时间为0.5~1 h。
9.根据权利要求1所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述低温回火时间为2~4 h。
10.根据权利要求1所述的锻后余热等温正火细晶齿轮制备方法,其特征在于,所述锻造成型后的齿轮冷却后的保温时间为20min~40min。
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