【作者】 郭超；

【导师】 王爱玲；

【作者基本信息】 中北大学 ， 机械制造及其自动化， 2010， 硕士

【摘要】 高铬铸铁作为一种优良的耐磨材料，被越来越广泛地应用于制造耐磨零件。高铬铸铁不仅抗磨能力优良而且还具备一定的冲击韧性，这主要是由其特殊的金相组织决定的，然而也正是由于这种特殊的金相组织使得高铬铸铁在切削加工过程中面临刀具磨损严重、加工效率低下等一系列问题。高铬铸铁的切削加工问题如果得不到很好的解决，势必会限制其应用范围。针对高铬铸铁在切削加工过程中面临的一系列问题，本研究将有限元法应用于解决高铬铸铁的切削加工问题。本研究将主要从以下几方面着手：（1）建立了描述高铬铸铁本构关系的Johnson-Cook本构模型；（2）对切削加工过程模拟仿真涉及到的关键技术一一进行阐述；（3）利用ABAQUS有限元分析软件模拟仿真高铬铸铁的切削加工过程，并对模拟仿真结果是否出现沙漏现象进行验证；（4）在没有出现沙漏现象的前提下，根据模拟仿真结果，分析高铬铸铁切削加工过程中与刀具磨损密切相关的切削力和切削热在不同刀具前角和切削用量下的变化情况。（5）优化选择切削加工高铬铸铁的刀具前角和切削用量，以达到延长刀具寿命、降低加工成本的目的。本研究成果可以在一定程度上改善高铬铸铁的切削加工性，对高铬铸铁在实际加工过程中刀具前角和切削用量的选择具有一定的理论指导意义。更多还原

【Abstract】 As an excellent wear resistant material,high chromium cast iron has been being utilizedto manufacture wear parts increasingly. High chromium cast iron is not only wear resistant,butalso of high impact toughness, and it is all determined by its unique metallographicstructure.However, the very metallographic structure results in a series of problems in highchromium cast iron cutting process, such as cutter wear,low machining efficiency and so on.Ifthe cutting problems of high chromium cast iron is not well solved, it certainly will restrict therange of application.This research applies FEM to solving the cutting problem of high chromium cast iron.This research will proceed form the following aspects:(1) Modeling Johnson-Cook constructive model describing the constructive relation ofhigh chromium cast iron;(2) Demonstrating the key techniques of simulation of cutting process;(3) Modeling cutting process of high chromium cast iron by FEM software ABAQUS,and checking whether hourglass phenomenon emerges;(4) Under the premise that the hourglass phenomenon doesn’t emerge, according to theresults of simulation, analyzing the variation of cutting force and cutting heat, whichhave something to do with cutter wear, under different rake angles and cuttingspecifications;(5) In order to extend service life of cutter when high chromium cast iron iscutting,optimizing rake angles and cutting specification.This research achievement improve the capacity of high chromium cast iron to someextent,and provide the guidance of optimizing rake angles and cutting specification to highchromium cast iron machining in theory.更多还原