金属快速剪切连接工艺及成形力研究

Research on metal rapid shear connection process and forming force

剪切连接是无头轧制技术中的重要工艺,变形过程中存在剪切、挤压和镦粗。为掌握成形载荷的变化规律,基于上限法-基元矩形技术和多元回归分析建立了压下量为1倍板料厚度时的成形载荷预测模型,可进行任意刃口宽度和搭接量组合参数下的理论成形载荷求解。对剪切连接进行了工艺实验,分别得到了工艺参数对侧凸率、去头端厚度百分比和载荷值影响的主次顺序,及相对于各判定指标的最优方案。通过建立综合评价指标并进行极差分析得到了最优参数组合。将实验载荷与所建立的预测模型理论载荷进行了对比,两者数据相近,最大相对误差小于8%。该研究为中间坯高温固态剪切连接奠定了理论基础,对生产实践具有一定的指导作用。

Shear connection is an important process in headless rolling technology,and there are shearing,extrusion and upsetting in the deformation process.Therefore,in order to grasp the change laws of the forming load,based on the upper limit method-primitive rectangle technology and multiple regression analysis,a forming load prediction model when the reduction amount was one times the thickness of sheet metal was established,and the theoretical forming load under any combination parameters of edge width and overlap amount was solved.Then,the process experiments were conducted on the shear connection,and the primary and secondary order of influence of the process parameters on the side convex rate,the thickness percentage of head-cuting end and the load value,and the optimal scheme relative to each judgment index were obtained.Furthermore,the optimal parameter combination was obtained by establishing a comprehensive evaluation index and conducting range analysis.Finally,the experimental load was compared with the theoretical load of the established prediction model,the data of the two were similar,and the maximum relative error was less than 8%.Thus,this research has laid a theoretical foundation for the high-temperature solid-state shear connection of intermediate billets and has a certain guiding effect on the production practice.