1.1本试验方法是试验方法G 164的扩展，使用斜面和回形针架检测柔性网表面是否存在润滑剂。一项识别自由旋转或低滚动摩擦轴承的研究表明，通过简单地将回形针更换为轴上的滚动轴承，回形针摩擦测试可以用于滚动摩擦。轧制开始时的斜面角度为分离角。该试验方法可用于测量小直径（外径高达100 mm）滚动元件轴承的脱离角度。在该方法开发过程中测试过的轴承是具有不同分离器、密封件和不同润滑条件（无、油、油脂等）的传统滚珠轴承，但没有技术原因说明该测试方法不适用于其他设计的轴承，包括滑动轴承。 与任何滑动系统一样，滚动轴承在分离时可能具有不同于连续滚动的摩擦特性。与大多数斜面摩擦试验一样，该试验仅在可测量滚动开始时产生摩擦特性，在可测量滚动开始时使用角度（）。本试验的目的是评估分离滚动摩擦特性，以帮助机器设计师选择仪器枢轴等涉及分离摩擦的滚动元件轴承。 1.2以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3本标准无意解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 该测试是确定轴承自由滚动能力的一种简单有效的方法。大多数轴承制造商不提供有关其产品分离摩擦系数的信息，如果这是一个设计因素，用户通常会购买候选轴承并进行尝试，直到找到一个比其他轴承运行更自由的轴承。该测试允许量化轴承的分离摩擦特性。该测试将轴承的摩擦评估为一个摩擦系统，包括其结构和润滑。它已表明与使用相关。如果轴承在本试验中具有较低的分离角，则其在使用中的分离摩擦力将低于在本试验中具有较高分离角的相同尺寸轴承。 轴承的分离摩擦在力较轻且轴承用作枢轴而非持续旋转的仪器中很重要。低摩擦通常是正确操作设备的必要条件。 卷筒纸处理辊通常采用分离摩擦小的轴承。许多辊子仅由切向腹板接触驱动，滑动通常会损坏腹板。需要低摩擦轴承。 该测试有助于筛选分离摩擦是设计问题的任何应用中的轴承。

1.1 This test method is an extension of Test Method G 164 and uses an inclined plane and a paperclip rider to detect the presence or absence of lubricants on the surfaces of flexible webs. A study to identify free spinning or low rolling friction bearings indicated that the paperclip friction test could be used for rolling friction by simply replacing the paperclip with a rolling element bearing on an axle. The angle of the inclined plane at initiation of rolling is the breakaway angle. This test method can be used to measure the angle at breakaway of small diameter (up to 100 mm outside diameter) rolling element bearings. The bearings that have been tested in the development of this method are conventional ball bearings with different separators, seals, and different conditions of lubrication (none, oil, greases, and so forth), but there is no technical reason why this test method would not work with bearings of other design, including plain bearings. Rolling element bearings like any sliding system can have friction characteristics at breakaway that are different than rolling continuously. As is the case with most inclined plane friction tests, the test only produces the friction characteristic at the onset of measurable rolling, using the angle () when measurable rolling commences. The objective of this test is an assessment of breakaway rolling friction characteristics to assist machine designers in the selection of rolling element bearings for instrument pivots and the like where breakaway friction is a concern. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== This test is a simple, effective way of determining the ability of bearings to roll freely. Most bearing manufacturers do not supply information on the breakaway friction coefficient of their products and if this is a design factor, users often buy candidate bearings and try them until they find one that appears to operate freer than the others. This test allows quantification of the breakaway friction characteristics of bearings. This test assesses the friction of a bearing as a tribosystem which includes its construction and lubrication. It has shown to correlate with use. If a bearing has a low breakaway angle in this test, its breakaway friction will be lower in service than the same size bearings that displayed a higher breakaway angle in this test. Breakaway friction of bearings is important in instruments where forces are light and the bearings are used as pivots rather than for continued rotation. Low friction is often imperative for proper device operation. Bearings with low breakaway friction are often sought for web handling rollers. Many rollers are driven only by tangential web contact and slippage can often damage the web. Low friction bearings are required. This test is useful for screening bearings for any applications where breakaway friction is a design concern.