【摘要】：隨著裝備制造業(yè)的發(fā)展,對(duì)金屬線材彎曲件的形狀復(fù)雜程度、產(chǎn)品精度及加工速度要求越來(lái)越高,傳統(tǒng)的手工或半自動(dòng)彎曲方式很難滿足需求,發(fā)展全自動(dòng)線材折彎設(shè)備十分必要。且在卸載過(guò)程中,線材不可避免的發(fā)生回彈,更是嚴(yán)重影響產(chǎn)品成形質(zhì)量。因此,研究各工藝參數(shù)和材料參數(shù)對(duì)線材回彈現(xiàn)象的影響,盡可能減小回彈,提高成形質(zhì)量,具有重要的現(xiàn)實(shí)意義。本文針對(duì)線材折彎設(shè)備及線材折彎回彈特性進(jìn)行深入研究,具體內(nèi)容如下:首先,根據(jù)對(duì)線材折彎設(shè)備的需求分析,進(jìn)行線材折彎設(shè)備方案設(shè)計(jì),并針對(duì)儲(chǔ)料模塊、送料校直模塊、上料模塊以及聯(lián)動(dòng)折彎模塊四個(gè)主要功能模塊逐一進(jìn)行設(shè)計(jì),最終實(shí)現(xiàn)線材折彎設(shè)備的總體結(jié)構(gòu)設(shè)計(jì),在結(jié)構(gòu)方面實(shí)現(xiàn)了更好的柔性和更高的集成化程度,并實(shí)現(xiàn)了連續(xù)加工,提高了加工效率。其次,對(duì)線材折彎回彈現(xiàn)象進(jìn)行研究,采用解析法和數(shù)值法分別對(duì)線材進(jìn)行兩種彎曲角度的分析計(jì)算,并將回彈角度的理論計(jì)算結(jié)果與數(shù)值模擬結(jié)果進(jìn)行對(duì)比分析,具有良好的一致性,證明數(shù)學(xué)模型的正確性及可靠性。另外,對(duì)線材卸載回彈過(guò)程中線材內(nèi)部殘余應(yīng)力進(jìn)行了分析。再次,運(yùn)用正交試驗(yàn)法,以線材的回彈角度及回彈半徑作為指標(biāo),研究相對(duì)彎曲半徑、彎曲角度、相對(duì)彎曲力矩、彎曲力臂長(zhǎng)度、硬化指數(shù)及強(qiáng)度系數(shù)六個(gè)影響因素對(duì)線材折彎回彈的影響,得到線材對(duì)回彈影響因素的靈敏度排序。并基于矩陣分析法,得到線材折彎最佳參數(shù)組合,并驗(yàn)證最佳參數(shù)組合的正確性。最后,基于Visual Basic 6.0編程軟件開(kāi)發(fā)一款線材折彎回彈預(yù)測(cè)系統(tǒng),用戶通過(guò)選擇或設(shè)置與實(shí)際工況相符的參數(shù),提交后系統(tǒng)自動(dòng)調(diào)用ABAQUS有限元分析軟件進(jìn)行數(shù)值模擬,直接顯示所預(yù)測(cè)的回彈角度并輸出后處理文件,為回彈問(wèn)題的解決提供了新途徑,具有傳統(tǒng)方法無(wú)法比擬的效率優(yōu)勢(shì)。
[Abstract]:With the development of equipment manufacturing industry, the requirements of shape complexity, product precision and processing speed of metal wire bending parts become more and more high. Traditional manual or semi-automatic bending methods are difficult to meet the demand. It is necessary to develop automatic wire bending equipment. In the process of unloading, the springback of wire is inevitable, which seriously affects the forming quality of the product. Therefore, it is of great practical significance to study the effect of various process parameters and material parameters on the springback of wire rod, to minimize the springback and improve the forming quality as much as possible. In this paper, the bending characteristics of wire bending equipment and wire bending are studied. The specific contents are as follows: firstly, according to the demand analysis of wire bending equipment, the project design of wire bending equipment is carried out, and the material storage module is designed. The four main function modules of feeding straightening module, feeding module and linkage bending module are designed one by one. Finally, the overall structure design of wire bending equipment is realized, which realizes better flexibility and higher integration degree in structure. Continuous machining is realized and processing efficiency is improved. Secondly, the springback phenomenon of wire bending is studied. The analytical method and numerical method are used to analyze and calculate the two kinds of bending angles, and the theoretical results of springback angle are compared with the results of numerical simulation. It has good consistency and proves the correctness and reliability of the mathematical model. In addition, the internal residual stress of wire during unloading springback is analyzed. Thirdly, the relative bending radius, bending angle, relative bending moment, length of bending force arm are studied by using orthogonal test method, with the springback angle and springback radius of wire rod as the index, the relative bending radius, the bending angle, the relative bending moment and the bending force arm length are studied. The influence of six factors, hardening index and strength coefficient, on the springback of wire is obtained, and the order of sensitivity of wire to springback is obtained. Based on matrix analysis, the best parameter combination of wire bending is obtained, and the correctness of the best parameter combination is verified. Finally, based on the programming software of Visual Basic 6.0, a springback prediction system of wire bending is developed. The user chooses or sets the parameters consistent with the actual working conditions, and the system automatically calls the ABAQUS finite element analysis software to carry on the numerical simulation after submitting. Direct display of the predicted springback angle and output of post-processing files provide a new approach to the resolution of the springback problem and have an incomparable efficiency advantage compared with the traditional method.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG305

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本文編號(hào)：2335956