汽车重载齿轮的体积表面淬火新工艺.pdf

试验研究
汽车重载齿轮的体积一表面谇火新工艺
A. Mi. MHXIEOK, Hi. M. Berepa
MHHCKHM ABTOMOOWOHBR 3ABO], r. MHHCK, Benopycch
摘要:研发了用于处理低淬透性钢齿轮的仿形体积一表面感应淬火新工艺。与经渗碳、淬火处理的
20CrNi3A钢齿轮相比,两者的表面硬度相当,前者硬化层深度为2~4mm,是后者的1.5~2.0倍,
而心部硬度则比后者低2~6HRC。仿形体积表面感应淬火的主要工艺参数为:感应加热的比功
率≤10kW/kg,加热速度4~8℃/s。通过调节淬火剂量以1000℃/s的速度和±0.1s的精度冷
却后,经仿形体积一表面感应淬火的齿轮所有表面的硬度均可达58~63HRC。
关键词:仿形体积一表面感应淬火;齿轮;强烈淬火;低淬逶性钢
中图分类号:TG156.33
文献标识码:A
文章编号:1008-1690(2014)05-0032-08
A New Volume-surface Hardening Technology Adaptable
to Automobile Heavily Loaded Gears
A. I. Michluk, I I. Vegera
(Minsk Automobile Works, Minsk, Belorussia)
Abstract A new contour volume-surface induction hardening approach, which is adaptable to low-hardenabilit
steel gears, has been developed. Relative to 20crni3 A steel gear carburized and hardened, both are well-matched
in surface hardness, the hardened layer of the former is 2 to 4 mm, however, is 1.5 to 2.0 times as deep as those
of the latter, and the core hardness of the former is 2 to 6 HRC lower than that of the latter. The major process
parameters of the contour volume-surface induction hardening are as follows: induction heating specific power lower
than or equal to 10 kw/kg; heating rate of 48/s. After gear is contour volume-surface induction hardened by
quenching at 1000 C/s and accuracy of +0. I s the whole surface will reach as hardness as 58 to 63 HRC
Key words: contour volume-surface induction hardening; gear; intense quenching; low-hardenability stee
0引
体积一表面淬火工艺(OI3),是上世纪60年
代,由前苏联著名的感应热处理专家
Titemerakobckhz K3教授专门为所谓的低淬透性钢
而研制的。其实质在于,对经表面感应加热的低
淬透性钢工件进行强烈淬火冷却,使工件淬透的表
层形成马氏体,而在更深地被加热到高于Ac3温度
淬硬区
加热区
基体金属
的内层形成托氏体、索氏体及珠光体。同时,通过降图1低淬透性钢齿轮感应淬火后的加热区和淬硬区形貌
低钢中杂质的含量(杂质总含量不应超过0.5%)来
Fig. I Pattern of heated area and hardened area of a low-
限制淬透层深度,并沿轮齿的轮廓面形成淬硬层。
hardenability steel gear after induction hardening
齿轮的加热区和淬硬区的形貌如图1所示。
理同样重要的工艺,而对经过热处理的工件进行强
这种方法已经获得了实际应用,但由于还存在度性能和耐久性方面的研究。
某些不足之处,所以迄今还未将其视作与化学热处
首先,加热层深度仅限于齿冠及其下面的金属
收稿日期:2014-25-27
作者简介:A.互. MHXJIIOK,男,白俄罗斯明斯克汽车厂科学技术博士。
《热处理》2014年第29卷第5期