数控弯管机弯曲成形芯棒的研究

Research of CNC pipe bender forming mandrel

数控弯管机管件弯曲成形过程中,易出现管壁压扁、破裂、折皱等问题。芯棒的设计和应用解决了这一难题。所以优化芯棒的技术是提高弯管质量的重要环节。本课题以台湾颖霖弯管机(CNC-80 Tube bender型)为对象就芯棒的设计、结构、原理进行了研究,并研究了芯棒直径、伸出量、芯头数等参数及关系公式,抽芯速度、弯曲速度对弯曲质量的影响,芯棒与管件间隙对弯曲变形产生的影响,芯棒的选择和应用等问题。芯棒的使用降低了生产成本,提高了质量,为弯管成形加工提供理论参考与实际指导。

In CNC pipe bender, the forming process of tube wall is seen flattening, rupture, wrinkle and so on, while the design and application of mandrel could solve this difficult problem. So the optimization of the mandrel technology is very important to improve the quality of pipe bending. In this paper, it took the Taiwan Yingliu pipe bending machine （CNC -80 Tube bender type） as it＇s concerning subject, the mandrel design, structure and principle are analyzed, it discussed mandrel diameter, stretch out the amount, core numbers and their rela- tionship formulas. After that it considered how much the core pulling speed and bending speed influence ben- ding quality, as well as the fitting clearance between the mandrel and the pipe on the impacts of bending de- formation, issues of the selection and application of mandrel. It showed using mandrel could reduce the produc- tion cost, improve quality, which provide theoretical reference and practical guidance to bend forming.