极端重载切削条件下的刀-屑粘结失效  

Adhering Failure of the Tool-chip in the Process of Extremely Heavy Cutting

作　　者：程耀楠[1] 刘献礼[1] 李振加[1] 刘利[1] 王海婷[1] 

机构地区：[1]哈尔滨理工大学机械动力工程学院,哈尔滨150080

出　　处：《机械工程学报》2012年第19期169-176,共8页Journal of Mechanical Engineering

基　　金：国家高技术研究发展计划(863计划;2009AA044302);黑龙江省自然科学青年基金(QC2010112)资助项目

摘　　要：以筒节材料2.25Cr-1Mo-0.25V钢切削试验为基础,研究极端重型切削过程中刀-屑粘结失效问题,为实际生产过程中避免刀具粘结失效提供理论依据。分析极端重型车削过程变载荷波动特性;在仿真分析和试验分析的基础上,进而研究波动温度和机械载荷对刀具表层强度的影响,进行刀-屑粘结失效分析;进行综合理论分析,确立极端重载切削条件下刀-屑粘结发生的理论判据,并结合试验测试数据进行验证分析;从技术手段和工艺参数优化方面,提出刀-屑粘结预防措施。研究结果表明,切削区域的波动热-机械耦合冲击是引起刀-屑粘结失效产生的主要因素,且粘结程度与刀具和工件材料接触区域的应力大小有关。Based on the cutting experiments of the tube section material that is the 2.25Cr-1Mo-0.25V steel,the study on the adhering failure problem of the tool-chip in the process of the extremely heavy cutting is done,so to provide the theoretical basis for avoiding the cutter adhering failure in the actual machining process.The fluctuation characteristics of the variable load in the extremely heavy turning process is analyzed,and then the influence of the fluctuant temperature and mechanical load on the strength of the tool surface is studied based on the simulation analysis and experiments analysis,so to have adhering failure analysis of the tool-chip.The comprehensive theoretical analysis is done,and the critical adhering condition of the tools-chip under the condition of the extremely heavy cutting is established,and the verification analysis on it is done combined with the experimental test data.The preventive measures are provided from the aspects of the technical means and optimization of the process parameters.The research results show that the coupling impact of the fluctuant heat and mechanical load is the main factor that leads to the adhering of the tool-chip generating in the cutting area,and the adhering degree is connected with the size of stress between the tool and work-piece material contact area.

关 键 词：波动载荷 机械冲击 粘结失效 疲劳 

分 类 号：TG501[金属学及工艺—金属切削加工及机床]