Simulation and experimental study of deep hole drilling of oxygen-free copper
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摘要: 针对无氧铜深孔钻削时存在断屑难、易粘结等问题,采用仿真分析和试验研究相结合的方法,对无氧铜深孔钻削过程中切屑形态的变化进行了研究。基于ABAQUS软件对无氧铜深孔钻削过程进行了仿真,分析了进给量与转速的组合对切屑形态的影响规律,并进行了试验研究。研究结果表明:当转速为255 r/min、进给量为0.07 mm/r时获得短切屑,可实现顺畅排屑,为易切削难断屑材料的深孔钻削加工参数的选择提供了一定的参考依据。Abstract: In view of the difficulties of chip breaking and easy bond in the process of oxygen-free copper deep hole drilling, the chip morphology changes in the process of oxygen-free copper deep hole drilling were studied by combining simulation analysis and experimental research. Based on ABAQUS software, the process of anaerobic copper deep hole drilling was simulated, and the effect of the combination of feed rate and speed on chip morphology was analyzed, and the experimental study was carried out. The results show that when the speed is 255 r/min and the feed is 0.07 mm/r, short chip can be obtained and smooth chip removal can be achieved. The research of this paper provides a certain reference for the selection of machining parameters for deep hole drilling of easy cutting and hard chip cutting materials.
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Key words:
- oxygen free copper /
- deep hole drilling /
- chip shape
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表 1 刀具几何参数
几何参数 数值 外刃余偏角Ψr1/(°) 18 内刃余偏角Ψrτ1/(°) 18 外刃前角γ01/(°) 0 内刃前角γ0τ1/(°) −8 外刃后角α01/(°) 8 内刃后角α0τ1/(°) 12 断屑槽宽度Wn1/mm 1.5 断屑槽深度Hn/mm 0.5 断屑槽圆弧半径Rn/mm 1.0 表 2 工件与刀具材料基本属性
材料 杨氏模量/MPa 泊松比 线膨胀系数 比热/(J/g· ℃) 传导率/(W(mm·K) 密度/(t/mm3) 无氧铜 124 000 0.34 18.6×10−6 3.85×108 0.391 8.96×10−9 YG8 600 000 0.22 6.3×10−6 2.20×108 0.075 4 1.45×10−8 表 3 氧铜Johnson-Cook模型参数
参数名称 Johnson-Cook参数 优化参数 ρ/(kg/m3) 8960 —— 洛氏硬度 F-30 —— Cp/(J/kg·K) 383 —— Tm/ ℃ 1356 —— A/MPa 90 149.54 B/MPa 292 305.36 N 0.31 0.096 C 0.025 0.034 M 1.09 1.09 表 4 无氧铜Johnson-Cook损伤演化参数
损伤参数 数值 d1 −0.54 d2 4.89 d3 −3.03 d4 0.014 d5 1.12 熔点/ ℃ 1356 转变温度/ ℃ 293 参考应变率 1 表 5 切削加工参数
序号 转速/(r/min) 进给量/(mm/r) 1 355 0.07 2 355 0.05 3 255 0.07 4 255 0.05 -
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