摘要
钛合金材料由于具有强度高、耐蚀性好、耐热性高等特点而被广泛用于航空航天、重型机床制造等领域,铣削钛合金加工技术更是广泛应用在飞机骨架等关键零部件制造过程中,摩擦热—力学行为是铣削钛合金材料过程中发生的重要不可逆过程,铣刀摩擦磨损和热传导等多种热—力学行为直接影响工件与加工过渡表面的形成以及刀齿的磨损,进而影响刀具的使用寿命以及工件加工效率。针对已有刀—工接触模型未考虑刀齿振动、刀齿误差等作用对刀齿热—力学状态的影响,缺乏对铣削钛合金刀—工界面存在的热力学行为进行表征,本文依据铣削振动和刀齿误差作用下刀具与工件瞬时接触关系,构建刀—工界面基础模型及刀齿后刀面摩擦速度、摩擦系数、摩擦应力解算模型,通过表征刀—工界面热力学体系,研究刀—工界面存在的热力学行为,揭示后刀面摩擦力熵产生分布特性。依据二维刀具瞬态热传导模型构建二维热传导熵产生解算模型,揭示刀—工界面热传导熵产生演变特性。依据吉布斯自由能法判断铣刀刀—工界面可能发生的化学反应,构建刀—工界面化学反应熵产生解算模型并揭示化学反应熵产生演变特性。研究刀—工界面与外界存在的物质流动,构建刀齿微元磨损速率解算模型,获得刀—工界面摩擦磨损熵流演变特性,揭示刀—工界面由于磨损产物离开刀—工摩擦界面引起的熵变。研究铣削钛合金刀—工界面存在的热力学行为,分析热—力学行为对刀齿铣削状态的影响具有重要意义。
Titanium alloy materials are widely used in aerospace,heavy machine tool manufacturing and other fields due to their high strength,good corrosion resistance and high heat resistance.Milling titanium alloy processing technology is widely used in the manufacturing process of key parts such as aircraft frame.Friction thermodynamic behavior is an important irreversible process in the process of milling the above materials.Various thermodynamic behaviors such as friction and wear of milling cutter and heat conduction directly affect the formation of workpiece and machining transition surface and the wear of cutter teeth,which leads to the service life of cutter and the machining efficiency of workpiece.The existing cutter-worker contact model does not consider the influence of cutter tooth vibration,cutter tooth error and other effects on the thermodynamic state of cutter teeth,and lacks the characterization of the thermodynamic behavior of the cutter-worker interface in milling titanium alloy.In this paper,based on the instantaneous contact relationship between the tool and the workpiece under the action of milling vibration and cutter tooth error,the basic model of the tool-workpiece interface is constructed,and the friction velocity,friction coefficient and friction stress calculation model of the flank face of the cutter tooth are constructed.By characterizing the thermodynamic system of the tool-work interface,the thermodynamic behavior of the tool-work interface is studied,and the distribution characteristics of the friction entropy of the flank surface are revealed.Based on the two-dimensional tool transient heat conduction model,a two-dimensional heat conduction entropy generation solution model is constructed to reveal the evolution characteristics of the heat conduction entropy of the tool-worker interface.According to the Gibbs free energy method,the chemical reaction that may occur at the interface of the milling cutter is judged,the calculation model of the entropy generation of the chemical reaction at the interface of the cutter is constructed,and the evolution characteristics of the entropy generation of the chemical reaction are revealed.The material flow between the tool interface and the outside world is studied,and the calculation model of the wear rate of the cutter tooth is constructed.The evolution characteristics of the entropy flow of the friction and wear of the tool interface are obtained,and the entropy change of the tool interface caused by the wear product leaving the tool friction interface is revealed.It is of great significance to study the thermodynamic behavior of the tool-work interface in milling titanium alloy and analyze the influence of thermodynamic behavior on the milling state of the cutter teeth.
作者
邢东宇
成远清
毕刚
赵培轶
马强
Xing Dongyu;Cheng Yuanqing;Bi Gang;Zhao Peiyi;Ma Qiang(School of Mechanical and Power Engineering,Harbin University of Science and Technology,Harbin 150080,China;不详)
出处
《工具技术》
北大核心
2025年第9期97-110,共14页
Tool Engineering
基金
国家自然科学基金(52105440)
黑龙江省重点研发计划项目(创新基地)(JD2023SJ12)。
关键词
铣刀
摩擦力
热—力学行为
磨损
熵产生
milling cutter
frictional force
thermodynamic behavior
abrasion
entropy production
