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Application of Threadless Screw to Precise Linear Positioning
International Journal of Precision Engineering and Manufacturing ( IF 1.9 ) Pub Date : 2021-01-04 , DOI: 10.1007/s12541-020-00407-8
Yousef Hojjat , Mohammad Shirkosh

This paper presents a mechanism for linear movement which could be called threadless screw, in which a roller is pushed toward a rotating plain shaft and rotates with it. The roller moves on a helical path when its axis is not parallel to the axis of the shaft. Therefore, the roller moves in direction of the shaft axis, just as linear movement of a nut on a screw. The lead of this mechanism is not only a function of diameter of the shaft, but also the angle between axes of the roller and the shaft which gives the possibility to change the lead continuously from very fine to very rough leads. On the other hand the accuracy of this mechanism depends on the accuracy of a plain cylindrical surface which can be fabricated very accurately compared with the threads of a screw. Two configurations of this mechanism were designed and fabricated to verify the idea. Coarse and fine positioning speeds are 10 and 0.1 mm/sec over an effective range of 200 mm, respectively. The experimental results show that the fast positioning over wide range of movement with resolution of 10 nm is possible by this mechanism. Further investigation shows that applying thrust loads have considerable effect on the lead of the mechanism.



中文翻译:

无螺纹螺丝在精密直线定位中的应用

本文提出了一种线性运动机构,可以称为无螺纹螺杆,其中,将滚子推向旋转的普通轴并随之旋转。当辊的轴线不平行于轴的轴线时,其沿螺旋路径运动。因此,滚子沿轴的方向运动,就像螺母在螺钉上的线性运动一样。该机构的导程不仅取决于轴的直径,而且还取决于辊子和轴的轴线之间的角度,从而可以将导程从非常细的导程连续更改为非常粗糙的导程。另一方面,该机构的精度取决于与螺钉的螺纹相比可以非常精确地制造的普通圆柱表面的精度。设计并制造了此机制的两种配置以验证这一想法。在200 mm的有效范围内,粗定位速度和精定位速度分别为10和0.1 mm / sec。实验结果表明,通过这种机制,可以在宽范围的运动范围内以10 nm的分辨率快速定位。进一步的研究表明,施加推力载荷对机构的导程有相当大的影响。

更新日期:2021-01-05
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