【作者】 叶泽刚；

【导师】 陈作炳；

【作者基本信息】 武汉理工大学 ， 机械工程， 2003， 硕士

【摘要】 随着我国输送管线建设的迅猛发展，大直径焊接钢管的需求量日益增加。针对大直径焊接钢管的生产，国内目前急需研究一套系统理论加以指导。 本文首先对大直径焊接钢管的制管现状进行了系统介绍和评价。然后从板料的塑性弯曲理论入手，在对折弯成形的合理假设和简化的基础上，采用数学解析方法，对直缝管筒折弯成形过程进行了工程理论描述，分析研究了板料在折弯过程中三种变形模式下的变形机理。重点揭示了板料弯曲中的折弯力、弯曲半径和折弯角度之间的内在关系。在板料单次折弯成形理论的基础上，建立了直缝管筒逐步折弯成形的数学模型。通过设计计算程序，生成直缝管筒折弯成形的初步工艺方案。并重点讨论了各工艺要素(折弯力、上模宽度、下模开口距离、折弯次数等)对管筒成形质量和生产效率的影响。同时结合生产实际，进一步通过对工艺方案的综合评价，得到合理的最终工艺方案。 通过对直缝管筒的逐步折弯成形过程的系统研究，对折弯设备的选择、模具设计，以及折弯成形工艺方案的制定等等，提供了重要的理论指导依据。并具有较大的工程应用价值。更多还原

【Abstract】 Along with the rapid development of construction of transport pipe-lines in our country, the demands for welded big-diameter pipes become greater and greater. It is in dire need of a set of theory to guide the production of pipes in China at present.The thesis first of all gives a systematic introduction and evaluation on the present situation of welded big- diameter pipes. Then starting with the theory of plastic deformation of plates, the thesis describes the bending process of open-seam pipes theoretically by applying the mathematical analysis method on the basis of the reasonable presumption and simplification of bending process. It analyzes and studies the deformation mechanism of plates under three deformation modes during the bending process and mainly reveals the internal relationship among the bending force, bending radius and angle during the process. Basing on the theory of single forming , the mathematical model of progressive forming of open-seam pipes is established. The preliminary process plan of bending open-seam pipes is generated through programming. The discussion centers on the effects on pipes quality and productivity by various process factor such as bending force, punch width, die gap and bending times etc. The reasonable final process plan is eventually generated by further comprehensive evaluation of the initial plan and combining the practical production.Through the systematic study of progressive Forming of the open-seam pipes, it offers important theory reference to the selection of bending equipment, the design of tooling and the decision of process plan etc. What’s more , it is of significant value of engineering application.更多还原