Abstract
In this study the mechanical behaviors of shaft and hub were investigated by using the experimental tests by measuring the required axial load during coupling and decoupling in interference fitting. The surface roughness of the shaft and hub thickness effects on the mechanical property of interference was studied. All tests were performed for constant interference fit classes for three different surface roughness of the shaft without changing the inner surface roughness of the hub. Also four different outer diameters of hubs with keeping constant surface roughness of the inner diameter of hub studied, thus 21 samples of interference studied. The analysis of variance reveals in this study is that the best interference tightens condition is achieved at fine surfaces, the results also show that the hub thickness effect and increases the stresses are usually generated immediately and reach maximum value in the inner site of hub after the assembly completed. Finite element model of shaft and hub was established, and the equivalent stress and contact stress for different hub thickness were computed after interference coupling, diameters in the thin hubs increase when coupling complete which reduces the interference between the shaft and hub.
Highlights
Interference fit considers as a semi-permanent assembly method for mechanical parts, which is achieved by the interference after the tolerance part hub cooperate with the contained part shaft
The interference fit is achieved by the outer radius of the shaft member was larger than the inner radius of the hub by the radial interference (δ) [1]
The work planned and carried out in such a way to provide detailed information on the effect of surface roughness on interference fitting behavior, the first independent variable are three different surface roughness of a shaft made by turning have been investigated (μ1 = 0.46,μ2 = 1.2 and μ3 = 1.86), there is a big range among the chosen coefficients of friction to reach effective results, the roughness made by changing cutting speed and depth of cut, while the roughness of the inner surface of hub keep constant by made it using drilling technique
Summary
Interference fit considers as a semi-permanent assembly method for mechanical parts, which is achieved by the interference after the tolerance part hub cooperate with the contained part shaft. The interference fit is achieved by the outer radius of the shaft member was larger than the inner radius of the hub by the radial interference (δ) [1]. In this assembly the tensile stresses will be induced in the outer hub and compressive stresses on the inner shaft. Due to this shrink fitting a radial pressure will be induced in the common surface due to diametrical interference. Inner surface of the hub will be subjected to tensile stress and outer surface of the shaft will be subjected to compressive stress due to press fit of interference fit
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