【摘要】：復(fù)雜曲面模具是重要的工藝裝備,直接影響到產(chǎn)品的更新?lián)Q代能力,在現(xiàn)代制造業(yè)中占有舉足輕重的作用；其加工制造能力則是國家制造水平的綜合體現(xiàn),具有巨大的經(jīng)濟(jì)和社會(huì)效益。機(jī)床的運(yùn)行總伴隨著振動(dòng),機(jī)床的振動(dòng)會(huì)導(dǎo)致被加工工件的形狀精度和表面精度降低,刀具壽命和生產(chǎn)率下降。本文將主要圍繞復(fù)雜曲面模具鋼高速銑削振動(dòng)特性分析的相關(guān)問題,從切削機(jī)理出發(fā),通過理論和試驗(yàn)分析,全面系統(tǒng)地對(duì)高速切削中銑削力及其切削振動(dòng)問題做深入研究。1.銑削曲面的加工過程是一個(gè)復(fù)雜的加工過程,涉及到許多參數(shù),彼此之間還相互影響,其中切削力是切削過程中一個(gè)重要參數(shù),是研究“刀具-工件”系統(tǒng)、建立模型和動(dòng)力學(xué)分析的基礎(chǔ)。本文在建立的銑削力模型的基礎(chǔ)上,通過試驗(yàn)對(duì)切削力系數(shù)進(jìn)行識(shí)別,并對(duì)模型的精確度進(jìn)行驗(yàn)證。此外,分析了切削速度、每轉(zhuǎn)進(jìn)給量和切削深度對(duì)銑削力系數(shù)的影響規(guī)律。2.考慮銑削過程的復(fù)雜性,刀具振動(dòng)是影響加工工件表面質(zhì)量的一個(gè)重要因素。因此借助ANSYS有限元分析軟件,對(duì)實(shí)際切削加工中的刀具和工件有限元結(jié)構(gòu)模型進(jìn)行振動(dòng)模態(tài)仿真分析,然后與試驗(yàn)?zāi)B(tài)分析結(jié)果進(jìn)行對(duì)比驗(yàn)證。經(jīng)過比較分析,本文通過試驗(yàn)?zāi)B(tài)測(cè)得的固有頻率與有限元結(jié)構(gòu)模態(tài)分析得到的模態(tài)振型相符,為銑削振動(dòng)特性研究做好準(zhǔn)備。3.針對(duì)高速切削系統(tǒng)結(jié)構(gòu)和受力都比較復(fù)雜的特點(diǎn),對(duì)空轉(zhuǎn)條件下和高速切削過程中主軸和工件的振動(dòng)進(jìn)行檢測(cè)并進(jìn)行對(duì)比分析。通過單因素試驗(yàn)定量地描述并系統(tǒng)地分析了塑料模具鋼NAK80在不同切削用量條件下主軸和工件的振動(dòng)變化規(guī)律,探討了引起切削振動(dòng)的內(nèi)在原因。這些對(duì)切削振動(dòng)的研究,對(duì)揭示切削振動(dòng)機(jī)理,檢測(cè)和分析切削振動(dòng),從而采取有效措施減少切削振動(dòng)、提高加工表面質(zhì)量奠定了基礎(chǔ)。
[Abstract]:The complex curved die is an important process equipment, which directly affects the upgrading ability of products and plays an important role in the modern manufacturing industry, and its processing and manufacturing ability is a comprehensive embodiment of the national manufacturing level. It has great economic and social benefits. The movement of machine tools is always accompanied by vibration. The vibration of machine tools will reduce the shape accuracy and surface precision of the workpiece being machined, and the tool life and productivity will decrease. This paper will focus on the problems related to the analysis of the vibration characteristics of high-speed milling of complex curved die steel. Based on the cutting mechanism and through theoretical and experimental analysis, the milling force and its vibration in high speed cutting will be studied thoroughly and systematically in this paper. The machining process of milling curved surface is a complicated machining process, which involves many parameters and also affects each other. Among them, cutting force is an important parameter in the cutting process and is used to study the "Cutter-workpiece" system. The foundation of model and dynamics analysis is established. On the basis of the milling force model established in this paper, the cutting force coefficient is identified by experiments, and the accuracy of the model is verified. In addition, the influence of cutting speed, feed rate per rotation and cutting depth on milling force coefficient is analyzed. Considering the complexity of milling process, tool vibration is an important factor affecting the surface quality of workpiece. Therefore, the finite element model of cutting tool and workpiece is simulated and analyzed by ANSYS finite element analysis software, and the results are compared with the experimental modal analysis results. Through comparison and analysis, the natural frequencies measured by the experimental modal are consistent with the modal modes obtained by the finite element structural modal analysis, which is prepared for the study of milling vibration characteristics. In view of the complex structure and force of high speed cutting system, the vibration of spindle and workpiece under the condition of idling and during high speed cutting is detected and compared. The vibration changes of the spindle and workpiece of plastic die steel NAK80 under different cutting parameters were described and systematically analyzed by single factor test, and the internal causes of cutting vibration were discussed. These researches on cutting vibration lay a foundation for revealing the mechanism of cutting vibration, detecting and analyzing cutting vibration, and taking effective measures to reduce cutting vibration and improve the quality of machined surface.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG54

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相關(guān)期刊論文 前1條

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本文編號(hào)：2126323