摘要
等速万向节三柱槽壳材料为中碳结构钢,其柄部要进行表面淬火,但由于淬火部位比较特殊,处理有难度。采用不同的工艺参数,即1.2~2.1 mm感应器底面与工件小端面之间的间隙δ、38%和50%加热电压系数、2.4~4.0 s加热时间及约38 mm感应器内径等,对等速万向节三柱槽壳柄部进行了扫描感应淬火。检测了有效硬化层深度和显微组织。结果表明:感应器内径一定,δ减小,三柱槽壳柄部R角处有效硬化层深度增大;小间隙δ+短时加热与大间隙δ+长时间加热、高电压+短时加热+大间隙δ与低电压+长时间加热+小间隙δ均可在R角处获得相近的有效硬化层深度和显微组织。三柱槽壳柄部最佳的感应淬火工艺参数为1.2 mm间隙δ、38%加热电压系数、3.7 s加热时间和38 mm感应器内径。
The three-column grooved shell of constant-velocity universal joint, made from semi-hard steel, needs to harden its stem surface, however, is difficult to be handled due to more unusual positions to be hardened. Using different process parameters, that is, gaps δ between the bottom surface of inductor and the small end surface of workpiece of 1.2 to 2.1 mm, heating voltage coefficients of 38% and 50%, heating times of 2.4 to 4.0 s, inner diameter of inductor of about 38 mm, the stem of three-column grooved shell of constant-velocity universal joint was scanning induction hardened. The effective hardening depth and microstructure were detected. The results showed that(a)when the inner diameter of inductor was fixed, the effective hardening depth at R corner of the three-column grooved shell stem increased with the decrease in the δ value;(b) the three-column grooved shell stem exhibited similar effective hardening depths and microstructures at R corner after induction hardening by the combination of smaller δ value and shorter heating time, and the combination of larger δ value and longer heating time, the combination of higher voltage, shorter heating time and larger δ value, and the combination of lower voltage, longer heating time and smaller δ value. The optimum induction hardening process parameters were δ value of 1.2 mm, heating voltage coefficients of 38%,heating time of 3.7 s, and inductor inner diameter of 38 mm for the three-column grooved shell stem.
作者
霍金元
陈国军
郑德信
廖春晖
HUO Jinyuan;CHEN Guojun;ZHENG Dexin;Liao Chunhui(Wanxiang Qianchao Co.,Ltd.,Hangzhou 311200,Zhejiang China)
出处
《热处理》
CAS
2022年第5期29-33,共5页
Heat Treatment
关键词
间隙
加热电压
加热时间
显微组织
有效硬化层
gap
heating voltage
heating time
microstructure
effective hardened layer
