本文選題：五軸加工 + 環(huán)形銑刀��； 參考：《太原科技大學(xué)》2017年碩士論文

【摘要】：隨著科學(xué)技術(shù)的不斷發(fā)展,高端技術(shù)產(chǎn)業(yè)中復(fù)雜曲面的運(yùn)用越來越多,對關(guān)鍵零部件的制造技術(shù)要求更加嚴(yán)格,由于五軸加工刀位姿態(tài)靈活可變,加工效益優(yōu)異,被廣泛的運(yùn)用到高端技術(shù)制造業(yè)中。五軸加工是一個復(fù)雜的物理過程,加工過程中的切削力、變形和振動等現(xiàn)象嚴(yán)重制約著銑削加工質(zhì)量和加工效益。目前,對于穩(wěn)定性的研究大多都是針對三軸立銑加工,切削力研究大多都是針對球頭銑刀五軸加工,而對于環(huán)形銑刀五軸加工及其穩(wěn)定性的研究卻較少。本文主要以環(huán)形銑刀作為加工刀具,圍繞五軸加工中的動態(tài)特性,對刀具跳動、切削力和穩(wěn)定性進(jìn)行研究。本文的主要研究內(nèi)容如下:根據(jù)環(huán)形銑刀的幾何模型,建立了考慮刀具徑向跳動的瞬時切削厚度模型,分析了刀具徑向跳動對瞬時切削厚度的影響,以及不同刀齒數(shù)刀具的每刃切削厚度的變化規(guī)律,建立了切削力模型,分析了環(huán)形銑刀徑向跳動對切削力的影響。運(yùn)用實體-解析法獲取不同傾角下刀具與工件的接觸區(qū)域,進(jìn)而得出離散下的切入切出角,運(yùn)用建立的五軸切削力模型預(yù)測銑削力的變化情況,并通過試驗對切削力模型的準(zhǔn)確性進(jìn)行了驗證。通過建立環(huán)形銑刀的動力學(xué)模型,提出了運(yùn)用線性多步法中Gear公式和Hamming公式預(yù)測銑削穩(wěn)定性,這兩種方法都有較高的計算精度和計算效率。運(yùn)用Hamming方法討論了不同刀具尺寸的變化和刀具跳動對銑削穩(wěn)定性影響,說明球頭銑刀、環(huán)形銑刀以及刀具徑向跳動現(xiàn)象在一定的條件下都能提高銑削穩(wěn)定性。通過建立五軸銑削加工動力學(xué)模型,運(yùn)用離散法獲取環(huán)形銑刀不同切削深度下的刀具開始切入和切出工件的切入切出角,分析了其與五軸切削力預(yù)測的切入切出角的不同之處,運(yùn)用CAM軟件將獲得的切入切出角通過MATLAB仿真得到不同傾角下的穩(wěn)定性葉瓣圖,說明加工時刀具傾角能改變銑削穩(wěn)定域,為五軸加工參數(shù)優(yōu)選提供了一定的理論基礎(chǔ)。
[Abstract]:With the continuous development of science and technology, more and more complex surfaces are used in high-end technology industry. The requirements for the manufacturing technology of key parts are more stringent. The five axis machining tool position is flexible and the processing efficiency is excellent, it is widely used in the high-end technology manufacturing industry. Five axis machining is a complex physical process, processing is a complex process. The cutting force, deformation and vibration in the process seriously restrict the quality and efficiency of milling. At present, most of the research on stability is aimed at three axis vertical milling. Most of the cutting force research is aimed at the five axis machining of ball end milling cutter, but the study on the five axis machining and the stability of the ring milling cutter is less. A circular milling cutter is used as a machining tool, and the dynamic characteristics of the five axis machining are studied. The cutting force, cutting force and stability are studied. The main contents of this paper are as follows: Based on the geometric model of the ring milling cutter, the instantaneous cutting thickness model considering the radial runout of the cutter is established, and the cutting thickness of the cutting tool to the instantaneous cutting thickness is analyzed. The influence of the degree and the changing law of the cutting thickness of each blade of the cutter number cutter set up the cutting force model. The influence of the radial runout of the ring milling cutter on the cutting force is analyzed. The contact area of the cutting tool and the workpiece under different inclination angles is obtained by the solid analysis method, and then the cut out angle is obtained and the five axis cutting is used. The force model is used to predict the change of the milling force, and the accuracy of the cutting force model is verified by the test. By establishing the dynamic model of the ring milling cutter, the Gear formula and the Hamming formula in the linear multistep method are used to predict the milling stability. These two methods have higher calculation precision and efficiency. The use of Hamming square method is used. The influence of different tool sizes and tool runout on milling stability is discussed. It shows that the ball end milling cutter, ring milling cutter and tool radial runout can improve the milling stability under certain conditions. By establishing the dynamic model of five axis milling, the cutting tool under the different cutting depth of the ring milling cutter is obtained by the discrete method. Starting cut and cutting out the cut out angle of the workpiece, the difference between the cutting angle and the cutting angle of the five axis cutting force is analyzed. The cut out angle obtained by the CAM software is obtained by MATLAB simulation to get the stable leaf flap under different inclination angles, which shows that the cutting angle of the cutter can change the milling stable domain and the optimization of the five axis machining parameters. It provides a certain theoretical basis.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG54

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本文編號：2009359