CAJ | 학술논문

为了减少刀具磨损、提高工件表面完整性，借助分子动力学仿真对金刚石纳米级切削单晶铜进行了深入研究，比较了干切和加水切削时的晶格变形、切削力和热耗散，探讨了水基切削液和断续切削对刀具磨损和表面质量的影响。结果表明：水分子能够有效将刀具表面和被切材料分隔开，但是由于刀尖处接触压力极高、水膜易被穿透致使刀尖与铜原子直接作用，因此黏着现象无法完全避免。加水切削有利于减小摩擦力并降低刀具表面热量，工件已加工表面完整性得到提高，而断续切削有利于水膜的保持并充分发挥其冷却润滑作用。
위료감소도구마손、제고공건표면완정성，차조분자동역학방진대금강석납미급절삭단정동진행료심입연구，비교료간절화가수절삭시적정격변형、절삭력화열모산，탐토료수기절삭액화단속절삭대도구마손화표면질량적영향。결과표명：수분자능구유효장도구표면화피절재료분격개，단시유우도첨처접촉압력겁고、수막역피천투치사도첨여동원자직접작용，인차점착현상무법완전피면。가수절삭유리우감소마찰력병강저도구표면열량，공건이가공표면완정성득도제고，이단속절삭유리우수막적보지병충분발휘기냉각윤활작용。
To reduce tool wear and improve the surface integrity of workpiece,molecular dynamics simulations of water lubrication assisted diamond nanometric cutting of single-crystal copper were conducted. The comparison of lattice deformation,cutting force and heat dissipation between dry and lubricated cutting was made. The effects of water-based lubricant and intermittent cutting on tool wear and surface integrity were discussed. It is found that water molecules can effectively separate the tool surface and the substrate,but direct interaction between tool tip and cop-per atoms cannot be avoided because of very high contact pressure and easy-to-be-penetrated water film. The simula-tion illustrates that water lubrication is beneficial for improving the surface integrity of workpiece,reducing friction,and decreasing the heat generation on the tool surface,but the extreme pressure at the tool tip prevents the total elimination of tool wear. Intermittent cutting is beneficial for maintaining water layer.