Interference fits are commonly used in engineering for various applications. While the effect of many factors on the load-carrying ability of interference fits has been studied extensively, the combined effect of cylindricity, roundness and roughness does not appear to have been considered to that extent, and this paper is an attempt to remedy the situation. As a first step, finite element method was used to verify that there will be a reduction in the load-carrying ability due to the introduction of perfect geometrical deviations on the shaft. Thereafter, a detailed experimental investigation was carried out to study the effect of cylindricity and their joint effect with various other factors on the axial load-carrying ability of shaft–bearing interference fitted assemblies. A number of shafts of C40 steel of nominal diameter 20 mm were manufactured with varying cylindricity values and selectively assembled with standard deep grove ball bearings, thereby achieving interference fits with a grade of H7/u6 between them. The assembled specimens were tested on a Universal Testing Machine with a specially made fixture and the maximum extraction load determined. The effect of the various factors on the extraction load was examined using statistical methods. It was found that shaft cylindricity error did reduce the load-carrying ability of interference fits. The combination of interference, cylindricity and surface roughness was found to give the best prediction for extraction load. Certain other parameters were also examined, but they were not found significant.

中文翻译：

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圆柱度、圆度和粗糙度对过盈配合轴向承载能力的综合影响

干涉配合通常用于各种应用的工程中。虽然许多因素对过盈配合承载能力的影响已得到广泛研究，但圆柱度、圆度和粗糙度的综合影响似乎并未考虑到那个程度，本文试图对这种情况进行补救。 . 作为第一步，使用有限元方法来验证由于在轴上引入了完美的几何偏差，承载能力会降低。此后，进行了详细的实验研究，以研究圆柱度及其与各种其他因素的共同作用对轴承过盈配合组件的轴向承载能力的影响。多根公称直径20mm的C40钢轴采用不同的圆柱度值制造，并有选择地与标准深沟球轴承组装，从而实现了它们之间H7/u6等级的过盈配合。组装的样品在带有特制夹具的万能试验机上进行测试，并确定最大提取载荷。使用统计方法检查了各种因素对提取负荷的影响。发现轴圆柱度误差确实降低了过盈配合的承载能力。发现干涉、圆柱度和表面粗糙度的组合给出了提取载荷的最佳预测。还检查了某些其他参数，但发现它们并不重要。