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当前大多数专业轴瓦厂对轴瓦半圆周长（PL）的测量是采用百分表或千分表,通过对高出度（SN）的测量这样一种间接测量方法实现的。轴瓦壁厚尺寸（el）的测量则采用测管千分尺作绝对测量。随着产品技术标准的提高;检验安全裕度（A）的考虑,原有的计量器具已不适应要求。计量器具选择适当与否直接影响到测得尺寸数据的可靠性,对保证轴瓦质量有着重要的技术经济意义。GB3177-82“光滑工件尺寸的检验”、JB/Z181-82“GB3177-82光滑工件尺寸的检验使用指南”是轴瓦新国标贯彻执行的保证。现对S195柴油机连杆轴瓦半圆周长、壁厚尺寸两个项目检验时计量器具的不确定度进行考虑。
At present, most professional bearing mills measure the semicircular circumference (PL) of a bearing shell by using a dial indicator or a dial gauge by an indirect measurement method such as high-degree-of-freedom (SN) measurement. Bearing wall thickness (el) measurements are measured using a micrometer pipe for absolute measurements. With the improvement of product technical standards; To test the safety margin (A) considerations, the original measuring instruments have not meet the requirements. The proper selection of measuring instruments has a direct impact on the reliability of measured size data, which has important technical and economic significance for ensuring the quality of the bearing pads. GB3177-82 “smooth workpiece size inspection”, JB / Z181-82 “GB3177-82 smooth workpiece size inspection guide” is a new national standard bearing the implementation of the guarantee. Now S195 diesel engine connecting rod bearing half-circle circumference, wall thickness measurement of two items when measuring the uncertainty of the instrument under consideration.