20Cr2Ni4钢渗碳淬火弧齿锥齿轮磨削烧伤的检测与分析

针对20Cr2Ni4钢弧齿锥齿轮渗碳淬火磨齿后出现的齿面裂纹,采用光学显微镜和显微硬度计分别对切割齿块的未开裂齿面(凹面)和开裂齿面(凸面)进行了检测分析。结果表明,在齿块未开裂齿面和开裂齿面远离裂纹的节圆处,有效硬化层深度和显微组织正常,无磨削烧伤特征;在齿根处均出现了不同程度的磨削烧伤特征,尤其在开裂齿面裂纹处呈现典型的月牙形白加黑磨削烧伤形貌,烧伤最深处约0.9 mm,并据此提出了改进磨齿工艺参数,避免发生磨削烧伤的措施。

Detection and analysis of grinding burns of 20Cr2Ni4 steel carburized and quenched spiral bevel gears

Aiming at the cracks on the tooth surface of 20Cr2Ni4 steel spiral bevel gear after carburizing, quenching and grinding,the uncracked tooth surface(concave) and cracked tooth surface(convex) of the cutting tooth block were measured by using optical microscope and microhardness tester. The results show that the effective hardened layer depth and microstructure at the pitch circle of the uncracked tooth surface and cracked tooth surface away from the crack of the tooth block are normal, and there is no grinding burn characteristics. There are different degrees of grinding burn characteristics at the tooth root, especially in the cracks of the cracked tooth surface, the crescent-shaped white and black grinding burn morphology, the deepest part of the burn is about 0.9 mm, and the improved grinding process parameters are put forward to avoid grinding burn.