18CrNiMo7-6钢磨削表面烧伤层实验研究  

Experimental Study on Burn Layer of 18CrNiMo7-6 Steel Grinding Surface

作　　者：牛伟强 梁国星 郝建宇 吕政 NIU Weiqiang;LIANG Guoxing;HAO Jianyu;LYU Zheng(School of Mechanical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Precision Manufacturing,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]太原理工大学精密加工山西省重点实验室,山西太原030024

出　　处：《热加工工艺》2022年第18期131-134,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51575375);山西省自然科学基金项目(201801D121174)。

摘　　要：高强度钢18CrNiMo7-6在磨削加工中容易出现磨削烧伤现象,为减少该类现象的发生,在干磨实验条件下,设计CBN砂轮磨削实验,通过人工热电偶测量磨削时工件表面温度,研究其磨削烧伤机理。采用磨削实验,研究了磨削深度、进给速度及砂轮速度对工件磨削烧伤的影响;采用显微硬度法和显微组织染色法对比结合分析了磨削烧伤金相组织、显微硬度的变化规律,探究了18CrNiMo7-6钢磨削烧伤机理及磨削烧伤深度的变化。结果表明:在磨削烧伤层发生明显的显微组织变化,回火烧伤层深为40~80μm;且随着距表面深度的加深,硬度逐步恢复为原始基体硬度。High strength steel 18CrNiMo7-6 is prone to grinding burns in grinding process.In order to reduce the occurrence of such burns,under the condition of dry grinding experiment,the grinding test of CBN grinding wheel was designed,and the surface temperature of the workpiece during grinding was measured by an artificial thermocouple.Th e influence of grinding depth,feed speed and grinding wheel speed on the workpiece grinding burn was studied by test.The changes of microstructure and microhardness of grinding burn were analyzed by using the method of microhardness and microstructural staining.The mechanism of grinding burn and the change of grinding burn depth of 18CrNiMo7-6 steel were studied.The results show that after grinding the burn layer,the microstructure changes obviously,and the tempering burn layer depth is 40-80μm,and with the increase of depth from the surface,the hardness gradually restores to the original matrix hardness.

关 键 词：高强钢 磨削烧伤 显微硬度 微观组织 CBN砂轮 

分 类 号：TG161[金属学及工艺—热处理] TG156.5[金属学及工艺—金属学]