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以目前国内普遍采用的外抱式螺旋焊钢管三辊成型器为研究对象 ,在作了一些基本假设的前提下 ,根据金属材料的弹塑性变形理论 ,建立了钢板在成型器中的受力模型。将钢板受力模型与螺旋钢管三辊成型器实际结构参数作为一个整体 ,推导出了螺旋钢管调型参数计算公式 ,编制了计算程序。理论研究表明 ,为使焊接后螺旋钢管产生零弹复或较小的弹复 ,在调型时必须使三辊成型器中的下压辊在理论圆周位置的基础上再下降一个位移量 ,以保证钢板在经过塑性变形后有较大的弹复空间。根据工厂提供的数据参数 ,计算了成型器中三个成型辊的调型参数 ,并与工厂现在使用的调型参数进行了对比 ,结果表明基本假设符合实际情况 ,建立的力学模型正确 ,理论调型参数值与实际调型参数值一致
Taking the commonly used external helical welded pipe three-roll former as the research object, under the premise of making some basic assumptions, according to the elastic-plastic deformation theory of the metallic material, the stress model of the plate in the former is established . The stress model of steel plate and the actual structural parameters of the three-roller spiral pipe as a whole, the calculation formula of spiral steel pipe tuning parameters is deduced, and the calculation program is compiled. Theoretical studies have shown that, in order to make the spiral steel pipe after welding zero recoil or less rebound in the shape must be made in the three-roll forming the lower roller in the theoretical circumferential position based on a further drop in the amount of displacement After the steel plate to ensure greater deformation after plastic space. According to the data parameters provided by the factory, the molding parameters of the three forming rollers in the former were calculated and compared with those used now in the factory. The results showed that the basic assumptions were in accordance with the actual situation, the mechanical model was established correctly, The value of the type parameter is the same as the value of the actual parameter