【作者】 孙世保；

【导师】 韩江； 刘全坤；

【作者基本信息】 合肥工业大学 ， 机械工程， 2009， 硕士

【摘要】 管道运输已经成为当前能源运输的主要方式。直缝埋弧焊钢管具有高强度高韧性的特点,新建的管线主要采用直缝埋弧焊管。本文以大直径厚壁直缝埋弧焊管的成形工艺为对象,对整个生产过程做了模拟分析。分析了模压式预弯模,并利用MSC.MARC软件的回弹计算功能进行数值模拟。研究了模具形状、预弯卷角、预弯宽度等因素对最终成形半径的影响。以弯曲回弹逆解公式为基础,设计正交试验,分析了板料厚度对回弹的影响。研究了多道次渐进折弯制管技术的工艺特点及其优势:将钢管的成形过程分解为多个步长,每步只对钢板的一部分进行弯曲,这时所需的折弯成形力较小,降低了对设备能量的要求。将3-D实体模型简化为2-D平面模型,选取凸模半径、凹模圆角半径、凹模开口量和凸模进入凹模深度等因素为对象进行优化。分析了以上因素对回弹的影响,通过选取合理工艺参数,实现了对回弹量的预测控制。研究了O形圆管的焊接工艺,采取气体保护预焊及内外双层埋弧焊的多层焊接工艺。根据母材性能及管材规格,选取焊丝,焊剂、温度、焊接电流、焊接电压等参数值。设计了管径在线测试系统,对钢管圆度进行检测和整形。利用激光传感器采集信号,通过计算机进行数据处理和直接显示,提高了管径的成形精度。研究了用多个扇形块对焊管进行机械扩径的方法,实现管材端口管一一管对接的要求。本文的研究工作给大直径厚壁管的生产提供了从毛坯到成品的全面完整的成形技术,对实际生产有较大的指导意义。更多还原

【Abstract】 Pipeline transportation has currently become the main form of energy transport. As the LSAW pipe has high strength and high toughness, some of the new-constructed pipelines were required to mainly use LSAW pipes. The entire production process was analyzed in this paper based on thick-walled large diameter LSAW pipe forming process.Pre-bending mode after die pressing is analyzed and simulated using the spring back calculation block of MSC.MARC software. The influences of the mold shape, pre-curved corner, pre-curved width, etc, to the radius of the final forming were studied. Perpendicular experiment was designed based on Bending Spring back formula for inverse kinematics. The impact of thickness of sheet metal on the spring back was analyzed..The technological feathers and advantages of multi-pass progressive bending pipe technology were studied. The pipe forming process was divided into several steps, and only part of the plate was bent during each step. The requirements to the equipment capacities were reduced due to the lower bending force.3-D solid model was simplified to 2-D plane model. Factors such as the punch radius, die radius, die opening volume, the depth of punch into the die and so on were optimized. Predictive control of the amount of spring back was realized by choosing the reasonable parameters, through analysis of the impact of the above factors on the rebound.The welding process of the O-shaped tube was researched through the pre-gas-shielded welding and submerged arc welding of internal and external layer with multi-layer welding process. The welding wire, solder, temperature, current, voltage and other parameters were selected according to parent metal properties and pipe specifications.A set of pipe-line testing system was designed to test and reshape the roundness of pipe. The forming accuracy of diameter was improved through the data processing and direct display by computer, using a laser sensor to collect the signal.The method using multiple fan-shaped die to expand the pipe was researched. The docking requirements of tube ports were satisfied after mechanical expanding. A very comprehensive and complete technical guidance of the production of large diameter thick-walled tube from the blank to the finished product is provided in this research work. It also provides a larger referential significance to the actual production.更多还原