<p>Hyperbolic ion trap rod fabricated using precision turning method</p>
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摘要: <p>双曲面型离子阱极杆具有较高的表面质量和面型精度要求, 以满足离子阱的性能要求，然而现有的加工工艺方法存在诸多不足，因此提出了基于慢刀伺服的非圆截面精密车削工艺方法。首先，针对非圆截面车削加工中存在附加工作角度进行分析，仿真结果表明用偏心装夹能极大减小加工中刀具后角干涉对刀具角度的需求。其次，对于非圆截面车削加工中的轮廓误差的形成因素进行理论分析，仿真结果显示具对心误差能极大影响曲面的轮廓误差，为了获得亚微米的线轮廓精度，刀具对心误差须控制在1 μm以下。最后，通过试制加工，最终双曲面型的轮廓精度可优于0.3 μm。</p>Abstract: <p>The performance of hyperbolic ion trap requires that each pole rod has a smooth surface and contour precision, while it’s not easy to achieve such results by conventional machining. In order to meet the requirements of smooth surface quality and sub-micron contour precision of hyperbolic ion trap rod, a non-circular section turning method based on slow tool servo technology is proposed. Firstly, the turning process of non-circular section was analyzed, and tool working angle was analyzed to avoid tool interference caused by large additive angle in non-circular section turning. The results showed that eccentric clamping could reduce tool additive angle. Secondly, factors concerned with contour accuracy were discussed, and the simulation results showed that tool centering error had a great influence on contour accuracy, this error needed to be controlled below 1 μm to realize sub-micron contour accuracy. Finally, experiment was carried out to testify and also measurement error was discussed due to measuring misalignment. Through trial fabrication, the contour error of hyperbolic surface can reach 0.3 μm.</p>
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Key words:
- hyperbolic rob /
- contour error /
- tool additive angle /
- non-circular turning /
- tool centering error
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表 1 不同刀具对刀误差组合对双曲线轮廓影响
μm 组别 1 2 3 4 5 6 7 8 刀具径向误差 5 −5 5 −5 0 5 0 2 刀具高度误差 5 5 −5 −5 5 0 2 0 轮廓偏差pv 3.06 3.06 3.06 3.06 2.12 1.42 0.84 0.56 
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