本文選題：螺旋扁管加工設(shè)備 + 擠壓成形分析��； 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：螺旋扁管具備傳熱高效、壓降小、不易結(jié)垢、結(jié)構(gòu)簡單、多節(jié)點(diǎn)自支撐消除管束誘導(dǎo)振動等特點(diǎn),是傳統(tǒng)換熱器改造及新型換熱器開發(fā)的新熱點(diǎn),是提升設(shè)備節(jié)能技術(shù)的有效措施。目前螺旋扁管加工設(shè)備主要由普通機(jī)床改造而成,其產(chǎn)品成形截面和節(jié)距的一致性、穩(wěn)定性差。本文針對該問題,設(shè)計一種新型高效的螺旋扁管加工設(shè)備,并對其關(guān)鍵技術(shù)進(jìn)行研究,主要完成以下內(nèi)容:首先,研究螺旋扁管擠壓成形機(jī)理,對擠壓成形方案作可行性分析。主要從以下三方面入手:建立了基管受壓彎矩分布模型,預(yù)測基管受模具擠壓變形趨勢;建立成形截面回彈量計算模型,分析截面回彈引起的成形誤差;通過DEFORM-3D模擬成形過程并實(shí)驗(yàn)驗(yàn)證模型可行性,模擬分析擠壓成形效果,同時得到擠壓載荷曲線,為后續(xù)系統(tǒng)設(shè)計奠定基礎(chǔ)。其次,依據(jù)擠壓成形方案、設(shè)計要求、總設(shè)計方案,完成成形機(jī)構(gòu)、定心機(jī)構(gòu)和輔助機(jī)構(gòu)的設(shè)計。對關(guān)鍵部件——成形機(jī)構(gòu)中的模具建立了形腔曲面方程,推導(dǎo)出分型面選取過程;并對機(jī)構(gòu)擠壓過程的運(yùn)動學(xué)、動力學(xué)分析,分析機(jī)構(gòu)運(yùn)動合理性。再次,針對多組成形機(jī)構(gòu)同步擠壓問題,提出液壓缸串聯(lián)同步控制方案,給出同步誤差補(bǔ)償方法,并經(jīng)計算選定了系統(tǒng)主要元件;采用PLC控制液壓系統(tǒng),完成控制系統(tǒng)電路設(shè)計和程序編寫、調(diào)試。最后,完成螺旋扁管加工設(shè)備樣機(jī)裝配、調(diào)試和產(chǎn)品檢測。對裝配時壓鉗干涉問題和模具中心軸線與基管軸線不重合現(xiàn)象給出裝配建議;并對產(chǎn)品成形參數(shù)檢測,結(jié)果表明:約97%截面長軸和節(jié)距符合設(shè)計要求。通過上述關(guān)鍵技術(shù)研究與系統(tǒng)設(shè)計,新型螺旋扁管加工設(shè)備有效提升產(chǎn)品截面和節(jié)距一致性、穩(wěn)定性,促進(jìn)了螺旋扁管加工技術(shù)吸收,利于其應(yīng)用推廣。
[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.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG375;TK172

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