曲線輪廓零件的切擠復(fù)合精整關(guān)鍵技術(shù)研究
發(fā)布時(shí)間：2019-05-12 09:48
【摘要】：切擠復(fù)合精整工藝為局部精密輪廓零件的加工提供了新的成形方法,它比切削加工效率高,又比精沖的成本低。本課題旨在對(duì)曲線輪廓零件進(jìn)行切擠復(fù)合精整關(guān)鍵技術(shù)研究,得出曲線輪廓零件的切擠復(fù)合精整工藝規(guī)律,并總結(jié)一套成形工藝參數(shù)規(guī)范,為曲線輪廓零件的切擠復(fù)合精整加工提供理論指導(dǎo)。本文首先研究了曲線輪廓零件的切擠復(fù)合精整變形機(jī)理,根據(jù)曲線輪廓特征,把精整細(xì)分為了內(nèi)凹輪廓精整和外凸輪廓精整兩種類型。研究了切擠復(fù)合精整中變形區(qū)的劃分、變形區(qū)的應(yīng)力應(yīng)變狀態(tài),得到了第三變形區(qū)是影響成形質(zhì)量的核心變形區(qū)以及對(duì)切擠復(fù)合精整工藝有主要影響的工藝參數(shù)。其次,研究了相應(yīng)模擬參數(shù)的設(shè)置,利用DEFORM-3D軟件建立了數(shù)值模型,并通過(guò)模型分析了內(nèi)凹輪廓精整和外凸輪廓精整過(guò)程,以及分析了精整過(guò)程中精整力、材料流動(dòng)速度場(chǎng)、金屬剪切滑移以及變形區(qū)應(yīng)力分布規(guī)律,得到了內(nèi)凹輪廓精整相對(duì)于外凸輪廓精整更有利于得到高的成形質(zhì)量。再次,對(duì)影響切擠復(fù)合精整工藝的五個(gè)工藝參數(shù)分別進(jìn)行分析,得到了它們對(duì)成形質(zhì)量的影響規(guī)律。最后,設(shè)計(jì)制造了內(nèi)凹輪廓精整和外凸輪廓精整實(shí)驗(yàn)?zāi)＞?通過(guò)實(shí)驗(yàn)驗(yàn)證了工藝規(guī)律的準(zhǔn)確性。并且分析了精整后成形零件表面特征,并總結(jié)了不同料厚下工件達(dá)到全光亮成形面的工藝參數(shù)規(guī)范。研究表明:主模具圓角、坯料余量和料厚是影響曲線輪廓零件切擠復(fù)合精整工藝的最關(guān)鍵工藝參數(shù),它們對(duì)精整工藝存在交互影響。本文的研究成果為曲線輪廓零件精整加工奠定了基礎(chǔ),為實(shí)際生產(chǎn)提供了很好的參考。
[Abstract]:The cutting and extrusion compound finishing process provides a new forming method for the machining of local precision outline parts, which is more efficient than cutting and lower than the cost of fine blanking. The purpose of this paper is to study the key technology of cutting and extrusion compound finishing of curve outline parts, to obtain the cutting and extrusion compound finishing process law of curve outline parts, and to summarize a set of forming process parameters specification. It provides theoretical guidance for cutting and extruding compound finishing of curve outline parts. In this paper, the mechanism of cutting and extrusion compound finishing deformation of curve outline parts is studied. According to the characteristics of curve outline, the finishing is subdivided into two types: concave profile finishing and convex profile finishing. The division of deformation zone and the stress and strain state of deformation zone in cutting and extrusion composite finishing are studied. The third deformation zone is the core deformation zone that affects the forming quality and the process parameters which have the main influence on the cutting and extrusion composite finishing process are obtained. Secondly, the setting of the corresponding simulation parameters is studied, the numerical model is established by using DEFORM-3D software, and the finishing process of concave contour and convex contour is analyzed by the model, as well as the finishing force and material flow velocity field in the finishing process are analyzed. According to the law of metal shear slip and stress distribution in deformation zone, it is found that concave profile finishing is more beneficial to obtain higher forming quality than convex profile finishing. Thirdly, the five process parameters affecting the cutting and extrusion composite finishing process are analyzed respectively, and their effects on the forming quality are obtained. Finally, the experimental dies of concave profile finishing and convex profile finishing are designed and manufactured, and the accuracy of the process law is verified by experiments. The surface characteristics of the formed parts after finishing are analyzed, and the process parameter specifications for the workpiece to reach the full bright forming surface under different material thickness are summarized. The results show that the fillet of the main die, the blank allowance and the material thickness are the most key process parameters that affect the cutting and extrusion compound finishing process of the curved outline parts, and they have interactive influence on the finishing process. The research results of this paper lay a foundation for the finishing of curved outline parts and provide a good reference for practical production.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG306
本文編號(hào)：2475289
[Abstract]:The cutting and extrusion compound finishing process provides a new forming method for the machining of local precision outline parts, which is more efficient than cutting and lower than the cost of fine blanking. The purpose of this paper is to study the key technology of cutting and extrusion compound finishing of curve outline parts, to obtain the cutting and extrusion compound finishing process law of curve outline parts, and to summarize a set of forming process parameters specification. It provides theoretical guidance for cutting and extruding compound finishing of curve outline parts. In this paper, the mechanism of cutting and extrusion compound finishing deformation of curve outline parts is studied. According to the characteristics of curve outline, the finishing is subdivided into two types: concave profile finishing and convex profile finishing. The division of deformation zone and the stress and strain state of deformation zone in cutting and extrusion composite finishing are studied. The third deformation zone is the core deformation zone that affects the forming quality and the process parameters which have the main influence on the cutting and extrusion composite finishing process are obtained. Secondly, the setting of the corresponding simulation parameters is studied, the numerical model is established by using DEFORM-3D software, and the finishing process of concave contour and convex contour is analyzed by the model, as well as the finishing force and material flow velocity field in the finishing process are analyzed. According to the law of metal shear slip and stress distribution in deformation zone, it is found that concave profile finishing is more beneficial to obtain higher forming quality than convex profile finishing. Thirdly, the five process parameters affecting the cutting and extrusion composite finishing process are analyzed respectively, and their effects on the forming quality are obtained. Finally, the experimental dies of concave profile finishing and convex profile finishing are designed and manufactured, and the accuracy of the process law is verified by experiments. The surface characteristics of the formed parts after finishing are analyzed, and the process parameter specifications for the workpiece to reach the full bright forming surface under different material thickness are summarized. The results show that the fillet of the main die, the blank allowance and the material thickness are the most key process parameters that affect the cutting and extrusion compound finishing process of the curved outline parts, and they have interactive influence on the finishing process. The research results of this paper lay a foundation for the finishing of curved outline parts and provide a good reference for practical production.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG306
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相關(guān)期刊論文 前2條
1 賈建軍,彭穎紅,阮雪榆;精沖過(guò)程的韌性斷裂[J];上海交通大學(xué)學(xué)報(bào);1999年02期
2 盧成遠(yuǎn);羅華光;;精整修形在沖裁模中的應(yīng)用[J];機(jī)械工藝師;1988年06期
相關(guān)碩士學(xué)位論文 前1條
1 寧國(guó)松;局部精密輪廓的切擠復(fù)合精整成形機(jī)理研究及參數(shù)優(yōu)化[D];重慶理工大學(xué);2013年
，本文編號(hào)：2475289
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