螺旋扁管加工设备设计与关键技术研究

发布时间：2018-05-12 10:47

本文选题：螺旋扁管加工设备 + 挤压成形分析　；参考：《南京理工大学》2017年硕士论文

【摘要】：螺旋扁管具备传热高效、压降小、不易结垢、结构简单、多节点自支撑消除管束诱导振动等特点,是传统换热器改造及新型换热器开发的新热点,是提升设备节能技术的有效措施。目前螺旋扁管加工设备主要由普通机床改造而成,其产品成形截面和节距的一致性、稳定性差。本文针对该问题,设计一种新型高效的螺旋扁管加工设备,并对其关键技术进行研究,主要完成以下内容:首先,研究螺旋扁管挤压成形机理,对挤压成形方案作可行性分析。主要从以下三方面入手:建立了基管受压弯矩分布模型,预测基管受模具挤压变形趋势;建立成形截面回弹量计算模型,分析截面回弹引起的成形误差;通过DEFORM-3D模拟成形过程并实验验证模型可行性,模拟分析挤压成形效果,同时得到挤压载荷曲线,为后续系统设计奠定基础。其次,依据挤压成形方案、设计要求、总设计方案,完成成形机构、定心机构和辅助机构的设计。对关键部件——成形机构中的模具建立了形腔曲面方程,推导出分型面选取过程;并对机构挤压过程的运动学、动力学分析,分析机构运动合理性。再次,针对多组成形机构同步挤压问题,提出液压缸串联同步控制方案,给出同步误差补偿方法,并经计算选定了系统主要元件;采用PLC控制液压系统,完成控制系统电路设计和程序编写、调试。最后,完成螺旋扁管加工设备样机装配、调试和产品检测。对装配时压钳干涉问题和模具中心轴线与基管轴线不重合现象给出装配建议;并对产品成形参数检测,结果表明:约97%截面长轴和节距符合设计要求。通过上述关键技术研究与系统设计,新型螺旋扁管加工设备有效提升产品截面和节距一致性、稳定性,促进了螺旋扁管加工技术吸收,利于其应用推广。
[Abstract]:Spiral flat tubes have the characteristics of high efficiency, small pressure drop, easy scaling, simple structure, multi-node self-supporting to eliminate the vibration induced by tube bundles, etc. It is a new hot spot in the development of traditional heat exchangers and new heat exchangers. It is an effective measure to improve equipment energy saving technology. At present, the processing equipment of spiral flat tube is mainly modified by common machine tool, its forming section and pitch are consistent and the stability is poor. In order to solve this problem, this paper designs a new type of high efficiency spiral flat tube processing equipment, and studies its key technology. The main contents are as follows: firstly, the forming mechanism of spiral flat tube is studied, and the feasibility of extrusion forming scheme is analyzed. This paper mainly starts with the following three aspects: establishing the distribution model of the bending moment of the base tube under compression, predicting the deformation trend of the base pipe by the die extrusion, establishing the calculation model of the springback of the forming section, and analyzing the forming error caused by the springback of the section; The process of forming was simulated by DEFORM-3D and the feasibility of the model was verified by experiments. The effect of extrusion forming was simulated and analyzed, and the extrusion load curve was obtained, which laid a foundation for the design of subsequent system. Secondly, according to the extrusion forming scheme, design requirements, general design scheme, complete the design of forming mechanism, centering mechanism and auxiliary mechanism. The form cavity curved surface equation is established for the die of the key component-forming mechanism, the selection process of parting surface is deduced, and the kinematics and dynamics analysis of the extrusion process of the mechanism is carried out, and the kinematic rationality of the mechanism is analyzed. Thirdly, aiming at the problem of synchronous extrusion of multi-group forming mechanism, a series synchronous control scheme of hydraulic cylinder is put forward, and the method of synchronizing error compensation is given, and the main components of the system are selected by calculation, and the hydraulic system is controlled by PLC. Complete control system circuit design and programming, debugging. Finally, the assembly, debugging and product testing of the prototype of the spiral flat pipe processing equipment are completed. The problems of clamping interference during assembly and the mismatch between the center axis of die and the axis of base tube are proposed, and the testing of product forming parameters shows that the long axis and pitch of about 97% cross section meet the design requirements. Through the research and system design of the above key technology, the new spiral flat pipe processing equipment can effectively improve the product section and pitch consistency, stability, promote the spiral flat pipe processing technology absorption, and facilitate its application and popularization.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG375;TK172

【参考文献】