厚壁筒体卷制成型碾长量的形成原因及工艺优化

Forming reason and technological optimization of the roll length of thick wall tube

采用大型四辊卷板机卷制同材质不同规格及同规格不同材质的一批筒体作为研究对象,通过采集数据、分析厚壁筒体在卷制过程中碾长量变化情况,得出材料的塑性及筒体规格是碾长量形成的主要原因。不同材料,塑性越好,越容易碾长,尺寸超差越大,对筒体成型精度的影响就越大;同种材料在相同工艺条件下,厚度越大,直径越小,在卷制过程中受到的压力越大,导致尺寸变化越大,对筒体成型精度的影响也就越大。实验结果表明,通过优化卷板工艺,控制碾长量的变化,可提高厚壁筒体成型精度。

In this paper,a large four-roller plate bending machine is used to roll a batch of shells with same material different sizes and same size different materials for two groups of research objects.Data of the thick-shell rolling length variation in the rolling process are collected and analyzed.It is concluded that the plasticity of materials and the shell sizes are the main reasons for the rolling length variation.For the different materials,better plasticity means easier roll long,more deviation and greater impact on the shell forming accuracy.For the same material,larger thickness and smaller diameter mean greater pressure on the shell in the rolling process,more plastic deformation and greater impact on the shell forming accuracy.Through this experimental study,we summarize the experience for optimizing the rolling process,controlling the change of rolling length,and improving the thick-shell forming accuracy.