采煤机重载齿轮渗碳效率预测的关键要素分析  

Analysis of Key Factors for Predicting Carburizing Efficiency of Heavy-duty Gears of Shearers Machines

作　　者：张云平 ZHANG Yunping(Changshu Tiandi Coal Machinery Equipment Co.,Ltd.,Suzhou 215500,China)

机构地区：[1]常熟天地煤机装备有限公司,江苏苏州215500

出　　处：《煤矿机电》2022年第4期26-30,共5页Colliery Mechanical & Electrical Technology

摘　　要：渗碳是采煤机重载齿轮生产过程中最重要的化学热处理工艺之一。针对重载齿轮用18Cr2Ni4WA合金钢,利用渗碳扩散理论,对渗碳效率的几个关键要素进行分析对比,预测了碳浓度分布和硬化层厚度的变化规律。比较了经典解析方法和数值计算方法预判一段式和二段式渗碳获得的硬化层厚度,结果表明:耦合合金元素浓度得到的碳扩散系数的数值计算方法更加准确可靠;预判了不同温度下渗碳硬化层内的碳浓度分布,发现渗碳温度从930℃提升至970℃时,相同渗碳时间内硬化层厚度提高约20%,验证了高温渗碳的效率提升能力。结合理论计算和实验研究对渗碳这一关键热处理工艺进行了验证和有益探索,为今后开发高浓度渗碳新工艺、提高渗碳效率、获得大深度渗层等热处理技术提供了准确可靠的预测理论和科学依据。Carburizing is one of the most important chemical heat treatment processes in the production process of heavy-duty gear of shearer.Aiming at 18Cr2Ni4WA alloy steel used for heavy load gears,several key elements of carburizing efficiency are analyzed and compared by using carburizing diffusion theory,and the change rules of carbon concentration distribution and hardened layer thickness are predicted.The classical analytical method and numerical calculation method are compared to predict the thickness of hardened layer obtained by one-stage carburizing and two-stage carburizing.The results showed that the numerical calculation method of carbon diffusion coefficient obtained by coupling alloy element concentration is more accurate and reliable.The carbon concentration distribution in the carburized hardened layer at different temperatures was predicted.It was found that when the carburizing temperature was increased from 930℃to 970℃,the thickness of the hardened layer in the same carburizing time was increased by about 20%,which verified the efficiency improvement ability of high temperature carburizing.Combined with theoretical calculation and experimental research,carburizing,the key heat treatment process,had been verified and beneficial explored,which provided accurate and reliable prediction theory and scientific basis for developing new high concentration carburizing process,improving carburizing efficiency,obtaining large depth carburizing layer and other heat treatment technologies in the future.

关 键 词：采煤机重载齿轮 渗碳 数值计算方法 硬化层厚度 碳扩散 

分 类 号：TD421.6[矿业工程—矿山机电]