高效换热管成形加工设备设计与应用

【作者】 张健；

【导师】 黄晓华；

【作者基本信息】 南京理工大学 ， 机械制造及其自动化， 2014， 硕士

【摘要】 高效换热管是一种传热性能良好的异形管材,被广泛的应用于换热器中。换热器传热系数的高低直接决定了能源利用效率,高效换热管的质量是决定换热器传热系数的主要因素。目前换热管加工设备大部分是在普通车床上进行改造的,自动化程度低,精度差,无法自动识别方管,从而降低了换热管传热效率,严重影响了换热器的质量。本文针对上述问题,设计出一种高效智能换热管加工设备,对其关键技术进行研究。利用Deform-3D软件对挤压过程进行模拟仿真,通过改变刀具转速、下压量、直径、直径差参数,分析刀具压力变化与管子等效应变,结合加工实验,得到最优加工工艺参数,刀具尺寸参数。根据产品的加工成形原理,设计出一种新型机械机构,主要包括齿轮传动系统、径向挤压进给系统、定心机构,在Solid Works中完成以上各系统的三维实体建模。完成换热管加工设备的数字控制系统设计,采用伺服同步驱动技术,实现了三把刀具的同步等距径向挤压进给运动。设计电气控制系统总体方案,完成了交流电机变频电路的设计,电气控制柜的设计。完成挤压力实时采集系统的设计,利用C++语言编写程序操作界面,通过采集到的数据与标准参考值比较,实现加工过程中方管的自动识别。通过以上关键技术的研究,提高了换热管加工设备的生产效率,提升了产品的精度与一致性,推进了换热管加工技术的发展。更多还原

【Abstract】 High effective heat exchange pipe is a kind of special pipe with excellent performance in transferring heat, which is widely used in heat exchange machines. The heat transfer coefficient directly determines the efficiency of energy usage, and the quality of high effective heat exchange pipe is the main reason that determines the heat transfer coefficient. At present, most machines that produce heat exchange pipes are refitted from traditional lathes, which are in low degree of automation with unsatisfactory precision and are unable to recognize square pipes. Therefore, the heat exchange pipes made using such devices are in bad precision and consistency, leading to low heat transfer coefficient and reducing the quality. Aiming at solving aforementioned problems, in this dissertation, smart processing machinery to produce high quality heat exchange pipes is designed. Main key technologies as followed.Using software Deform-3D to simulate the extrusion process, changing the speed, distance down the squeeze, diameter and the diameter difference parameter of the tool. By analyzing tool pressure pipe and equivalent strain degree of change, combining with experimental validation process, optimal process parameters and tool sizes are achieved.According to the principle of product forming, a novel mechanical structure is designed, including gear transmission system, radial extrusion feed system, centering mechanism, and the three-dimensional solid modeling in Solid Works is accomplished.The digital control system of the machinery is designed and applied, using servo drive units to realize three-axle synchronous control, which achieves the synchronous radial isometric feed of three roller cutting tools. The overall design of electrical control system solutions, the AC motor inverter circuit and electrical control cabinet are designed as well.Completion of the squeeze pressure real-time acquisition system design,the data collected compare with the standard reference values by using the C++programming language interface, applied with user interface to realize the automatic recognition and process of square pipes.By studying these key technologies to improve the production efficiency of equipment, enhancing the accuracy and consistency of the product, and promoting the development of processing technologies tubes.更多还原