【摘要】：連續(xù)型螺旋折流板換熱器具有優(yōu)良的傳熱性能,它的傳熱效率比弓形折流板換熱器和非連續(xù)型螺旋折流板換熱器更高,而且流體流動(dòng)阻力較小。但是連續(xù)型螺旋折流板制造難度較大,目前多采用模具沖壓成形技術(shù)制造,但是這種制造方法存在許多不足,例如模具制造困難,通用性差,成本較高,生產(chǎn)周期長。因此,連續(xù)型螺旋折流板需要一種更加完善的制造方法。本文提出采用多點(diǎn)成形的方法制造連續(xù)型螺旋折流板。多點(diǎn)成形是一種目標(biāo)形狀可調(diào)的柔性加工方法,這種方法已經(jīng)成功的應(yīng)用于船外板,列車流線型車頭覆蓋件等復(fù)雜形狀零件的成形制造,并且取得了很多成功的經(jīng)驗(yàn)。因此,本文根據(jù)連續(xù)型螺旋折流板的形狀特點(diǎn),提出用多點(diǎn)成形的方法制造連續(xù)型螺旋折流板。本文應(yīng)用商業(yè)軟件ANSYS/LS-DYNA對連續(xù)型螺旋折流板的成形過程進(jìn)行有限元數(shù)值模擬。通過模擬研究了連續(xù)型螺旋折流板多點(diǎn)成形過程中的應(yīng)力、應(yīng)變分布及回彈特點(diǎn)。模擬結(jié)果表明,螺旋折流板成形后的厚向應(yīng)變沿螺旋折流板的徑向方向由內(nèi)側(cè)向外側(cè)呈減小趨勢;回彈量隨著連續(xù)型螺旋折流板厚度的增加而逐漸減小。本文以螺旋折流板的厚度、材質(zhì)以及螺旋折流板的螺距、折流板徑向尺寸、基本體大小等為變量,通過對螺旋折流板成形過程的數(shù)值模擬,研究這些因素對成形過程中壓痕、起皺等缺陷的影響規(guī)律。研究結(jié)果表明,螺旋折流板成形時(shí)起皺、壓痕等缺陷隨板料厚度的增加而減小;隨螺旋折流板螺距的增大而增加。壓痕缺陷隨板料內(nèi)徑的增大而減少;另外,壓痕缺陷隨螺旋折流板外徑的增大而減少。同時(shí)隨著基本體尺寸的減小,螺旋折流板的壓痕和起皺缺陷減少。連續(xù)型螺旋折流板多點(diǎn)成形過程的研究表明,壓痕、起皺等成形缺陷可以完全壓制在允許范圍內(nèi),不會(huì)對連續(xù)型螺旋折流板的使用產(chǎn)生不良影響。因此,采用多點(diǎn)成形方法制造合格的連續(xù)型螺旋折流板是完全可行的。
[Abstract]:The continuous spiral baffle heat exchanger has excellent heat transfer performance, its heat transfer efficiency is higher than that of the bow baffle heat exchanger and the discontinuous spiral baffle heat exchanger, and the fluid flow resistance is smaller. However, it is difficult to manufacture continuous helical baffle plate. At present, most of them are made by stamping forming technology. However, there are many shortcomings in this manufacturing method, such as difficult manufacturing, poor generality, high cost and long production cycle. Therefore, continuous spiral baffle plate needs a more perfect manufacturing method. In this paper, a multi-point forming method is proposed to fabricate continuous helical baffles. Multi-point forming is a flexible machining method with adjustable target shape. This method has been successfully applied to the forming and manufacturing of complex shape parts such as outboard train streamlined front panels and so on and many successful experiences have been obtained. Therefore, according to the shape characteristics of continuous helical baffles, a multi-point forming method is proposed to fabricate continuous spiral baffles. In this paper, the forming process of continuous helical baffle plate is simulated by finite element method with commercial software ANSYS/LS-DYNA. The stress, strain distribution and springback characteristics of continuous helical baffle plate in multipoint forming are studied by simulation. The simulation results show that the thickness strain of the spiral baffle decreases along the radial direction of the spiral baffle from the inside to the outside, and the springback decreases with the increase of the thickness of the continuous spiral baffle. In this paper, the thickness, material and pitch of helical baffle plate, radial dimension of baffle plate and basic body size are taken as variables. Through numerical simulation of forming process of helical baffle plate, the indentation of these factors in forming process is studied. The rule of influence of defects such as wrinkling. The results show that the wrinkling and indentation of spiral baffles decrease with the increase of sheet thickness and increase with the increase of pitch of spiral baffles. The indentation defect decreases with the increase of the inner diameter of the sheet metal, and the indentation defect decreases with the increase of the outer diameter of the spiral baffle plate. At the same time, the indentation and wrinkling defects of the spiral baffle are reduced with the decrease of the basic body size. The research on the multi-point forming process of continuous spiral baffle plate shows that the forming defects such as indentation and wrinkle can be completely pressed within the allowable range and the use of continuous spiral baffle plate will not be adversely affected. Therefore, it is feasible to manufacture qualified continuous helical baffles by multi-point forming method.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ051.5

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