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首页> 外文会议>EuSPEN(European Society for Precision Engineering and Nanotechnology) International Conference; 20040531-0602; Glasgow(GB) >Thin film UHMWPE bearings for precision slideways
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Thin film UHMWPE bearings for precision slideways

机译：薄膜UHMWPE轴承，用于精密导轨

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摘要

In this extended abstract, results from tests on a novel, thin-film, Ultra-High-Molecular-Weight-Polyethylene (UHMWPE) bearing are presented. The bearings comprise a thin film of the polymer stretched over a spherical brass substrate. As of writing, two bearing geometries with substrate radii of 2.38 and 6.35 mm have been tested in air to determine both smoothness/repeatability of motion at traverse speeds of around 0.01 to 1.00 mm·s~(-1) and durability under loads ranging from around 2.2 to 28.0 N at speeds of up to 12.0 mm·s~(-1). Smoothness of motion of the 2.38 mm radius bearing was assessed by using it as the counterface for traversing a carriage along an optically polished Zerodur~® datum. A stylus-based measuring system was then used to profile a smooth, flat glass specimen and the repeatability of specific surface features measured with successive traces being used as a measure of both bearing noise and repeatability. While it is recognized that there are numerous other sources contributing to the measured signal, we believe this does represent a conservative estimate of the uncertainty of this bearing system. With this in mind it was apparent that features of amplitude less than 10 nm could be repeatedly measured. Durability was assessed using a custom built pin-on-disc testing apparatus. Wear of thin films is a particularly difficult measurement and we have used the criteria of breakthrough of the film as a measure of the durability. While the 2.38 mm bearing was observed to fail in one experiment, the larger radius bearing was observed to survive after sliding distances of over 2 km at loads and speeds of 28.0 N and 4.2 mm·s~(-1), respectively. This bearing represents a variant on the thin-film PTFE bearings that are used in some profilometers and the Tetraform™ grinding machine for motion control with sub-nanometer performance. The objective of this new bearing design is to produce a low-cost, robust, vacuum compatible and modular dry rubbing bearing with sub-nanometer performance. To operate at these levels, it is necessary to address stiffness, heat removal from the interface, wear, thermo-mechanical characteristics, accuracy of the datum counterface and frictional characteristics (in particular, stiction and load dependence).
机译：在此扩展摘要中，介绍了对新型薄膜超高分子量聚乙烯的轴承进行测试的结果。轴承包括在球形黄铜基底上拉伸的聚合物薄膜。在撰写本文时，已经在空气中测试了两种具有基板半径为2.38和6.35 mm的轴承几何形状，以确定在0.01至1.00 mm·s〜（-1）的横向速度下运动的平滑度/重复性以及在负载范围为约2.2至28.0 N，最高速度为12.0 mm·s〜（-1）。通过将2.38毫米半径的轴承用作对接面，使之沿着光学抛光的Zerodur〜®基准面穿过滑架，可以评估其运动的平滑度。然后，使用基于触控笔的测量系统对光滑的平板玻璃样品进行轮廓分析，并使用连续的迹线测量特定表面特征的可重复性，以同时测量轴承噪音和可重复性。尽管已经认识到有许多其他来源对测量信号有所贡献，但我们认为这确实代表了该轴承系统不确定性的保守估计。考虑到这一点，很明显可以重复测量幅度小于10 nm的特征。使用定制的针对光盘测试设备评估了耐久性。薄膜的磨损是一项特别困难的测量，我们已使用薄膜的穿透标准作为耐久性的量度。虽然在一个实验中观察到2.38 mm轴承失效，但观察到较大半径的轴承在28.0 N和4.2 mm·s〜（-1）的载荷和速度下滑动距离超过2 km后仍然存在。该轴承是薄膜PTFE轴承的一种变体，用于某些轮廓仪和Tetraform™磨床，用于具有亚纳米性能的运动控制。这种新轴承设计的目的是生产一种具有亚纳米性能的低成本，坚固，真空兼容且模块化的干式摩擦轴承。为了在这些水平上运行，必须解决刚度，从界面上的散热，磨损，热机械特性，基准对接面的精度和摩擦特性（特别是静摩擦和载荷依赖性）的问题。

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