本文選題：顫振 + 模型　； 參考：《華東理工大學(xué)》2016年碩士論文

【摘要】：顫振現(xiàn)象一直以來都是約束高速切削技術(shù)發(fā)展的一個主要的因素。不只是由于機床產(chǎn)生的顫振常常十分劇烈,而且產(chǎn)生顫振的根源就位于切削系統(tǒng)自身。避免和抑制切削顫振的對策變得十分有難度,已成為當(dāng)今機床加工能力的提高所面臨的最大障礙。因此,研究切削顫振的發(fā)生機理、規(guī)律及其控制方法,對提高機床的加工能力和加工精度,延長刀具的使用壽命,具有十分重要的意義。本文研究對象為再生顫振普通切削模型與振動切削模型。本文在對再生顫振機理以及振動切削技術(shù)深入研究的基礎(chǔ)上,建立了一個新的實用型的可適合多種工件材料的二自由度非線性再生顫振普通切削模型；又將該模型延伸到振動切削系統(tǒng),建立了一個含有脈沖切削力的二自由度非線性再生顫振振動切削模型；進行振動切削的顫振抑制實驗,在振動切削裝置上完成了4組普通切削和振動切削的對比試驗,觀測振動切削對顫振的抑制作用；進行振動切削的顫振抑制作用的數(shù)值模擬,利用與實驗相同的刀具和機床參數(shù),用matlab軟件對已經(jīng)建好的普通切削模型和振動切削模型進行仿真；最后,將數(shù)值模擬的結(jié)果與實驗結(jié)果進行對比,以此來驗證模型的準(zhǔn)確性。本文實驗結(jié)果和仿真結(jié)果具有很好的吻合性。實驗及仿真結(jié)果表明：顫振頻率與工件夾具系統(tǒng)固有頻率相近,即工件夾具振動系統(tǒng)固有頻率決定了顫振的頻率；二自由度非線性再生顫振普通切削模型與振動切削模型的正確性得到驗證；普通切削發(fā)生顫振的第一要素為刀具的角度,而振動切削即使改變刀具的角度,顫振仍被有效地抑制,表明振動切削比普通切削有更高的切削穩(wěn)定性。
[Abstract]:Flutter phenomenon has always been a major factor to constrain the development of high speed cutting technology. Not only is the chatter produced by machine tools often very violent, but the source of flutter lies in the cutting system itself. It is very difficult to avoid and suppress cutting chatter, which has become the biggest obstacle to the improvement of machining ability. Therefore, it is of great significance to study the mechanism, regularity and control methods of cutting chatter to improve the machining ability and precision of machine tools and prolong the service life of cutting tools. In this paper, the general cutting model and vibration cutting model of regenerative chatter are studied. On the basis of deep research on regenerative chatter mechanism and vibration cutting technology, a new practical two degree of freedom nonlinear regenerative chatter general cutting model suitable for many kinds of workpiece materials is established in this paper. The model is extended to the vibration cutting system, and a two degree of freedom nonlinear regenerative chatter vibration cutting model with pulse cutting force is established, and the chatter suppression experiment of vibration cutting is carried out. In this paper, four groups of contrast tests of ordinary cutting and vibration cutting are completed on the vibration cutting device, the effects of vibration cutting on chatter suppression are observed, and the numerical simulation of vibration cutting chatter suppression is carried out. Using the same tool and machine tool parameters as the experiment, the conventional cutting model and vibration cutting model are simulated by matlab software. Finally, the numerical simulation results are compared with the experimental results to verify the accuracy of the model. The experimental results are in good agreement with the simulation results. The experimental and simulation results show that the flutter frequency is close to the natural frequency of the workpiece fixture system, that is, the natural frequency of the workpiece jig vibration system determines the flutter frequency. The correctness of the two degree of freedom nonlinear regenerative chatter cutting model and vibration cutting model is verified. The first element of the common cutting chatter is the angle of the tool, and the vibration cutting even changes the cutting tool angle. Chatter is still effectively suppressed, indicating that vibration cutting has higher cutting stability than ordinary cutting.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG506.5

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本文編號：1904656