为准确计算辊套和辊芯热装等效应力,首次给出了考虑辊套和辊芯尺寸、材料物理性能参数及过盈量影响的辊套和辊芯热装径向应力计算公式,在此基础上得到了不同辊套厚度及过盈量条件下热装等效应力计算公式.为了验证该理论模型,用ANSYS软件对组合式支承辊热装过程进行了数值模拟,分析了不同辊套厚度、辊套和辊芯过盈量对结合面等效应力的影响.研究结果表明:相同过盈量及辊套厚度条件下,热装过程中周向应力约为径向应力的2倍;相同辊套厚度时,过盈量每增加0.1 mm,热装等效应力增大超过20 MPa;相同过盈量时,辊套厚度每增大100 mm,热装等效应力增大约20 MPa.
For calculating the effective stress on the fitting surface between the roll sleeve and the roll mandrel during the shrinkage fit process of the combined back-up roll, the thickness of roll sleeve, the physical property parameters of the material and the shrink range between the roll sleeve and the roll mangle were taken into account. The equation for calculating the assembly stress was proposed, then the circumferencial stress and radial stress on the fitting surface were obtained. Based on the equation, the effective stress formula was derived. Moreover, the shrinkage fit process of the combined back-up roll was simulated by the software ANSYS, and the relations between the shrinkage fit parameters and the assembly stress were studied. The results indicate that the circumferencial stress is almost twice than the radial stress on the fitting surface. Furthermore, the rise of the effective stress is greater than 20 MPa when the shrink range is increased by 0.1 mm in the same thickness of roll sleeve. In addition, the rise of the effective stress is almost 20 MPa when the thickness of roll sleeve rises by 100 mm in the same shrink range.
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