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随着对高强度,高延展性钛及钛合金棒材的迅速需求,开发有色金属棒材多辊热连轧技术是非常必要的。本研究在Y型三辊轧机上采用“多线段三角-圆”孔型系统生产钛合金棒材。采用ANSYS有限元软件模拟了TC4棒材在热连轧过程中的变形特征,轧制稳定性及温度分布;并在Y型连轧机上进行了试验验证。结果表明:带有凹面状的“多线段三角”孔型具有良好的对中性,能有效阻止轧件扭转或偏离轧制中心线,提高棒材轧制稳定性;此外,相对于“平三角-圆”孔型系统,采用这种孔型轧制棒材,显著降低了TC4合金棒材横截面的温度梯度,从而减少产品表面裂纹,提高表面质量。
With the rapid demand for high-strength, high-ductility titanium and titanium alloy bars, it is necessary to develop a multi-roll hot strip mill for non-ferrous metal bars. In this study, a “multi-segment triangle-circle” hole system was used to produce titanium alloy bars on a Y-type three-high mill. The deformation characteristics, rolling stability and temperature distribution of TC4 bar during hot continuous rolling were simulated by ANSYS finite element software. The experimental verification was carried out on the Y-continuous rolling mill. The results show that the concave multi-segment triangular hole has good centering property, which can effectively prevent the workpiece from twisting or deviating from the rolling centerline and improve the bar rolling stability. In addition, The “flat triangle - round” hole system, using this hole rolling bar, TC4 alloy bar significantly reduces the cross-section of the temperature gradient, thereby reducing the product surface cracks and improve the surface quality.