本文選題：重載切削 + 切削變形區(qū)�。� 參考：《哈爾濱理工大學(xué)》2017年碩士論文

【摘要】：2.25Cr-1Mo-0.25V鋼在我國石油、能源行業(yè)有著非常廣泛的應(yīng)用,是加氫反應(yīng)器筒節(jié)材料的重要組成部分,材料本身具有強(qiáng)度高、塑性好、耐高溫等優(yōu)點(diǎn),是一種難加工材料。在重型切削中,切削深度和進(jìn)給量大,導(dǎo)致產(chǎn)生的切削溫度和切削力也非常大,在熱-力的共同作用下會(huì)對刀具磨損產(chǎn)生一定的影響,因此,對重載切削條件下切削變形區(qū)的熱-力分布情況進(jìn)行研究,掌握其分布規(guī)律,以解決加工效率低、刀具磨損嚴(yán)重等難題。首先,基于前刀面切削力系數(shù)建立前刀面切削力預(yù)測模型,通過試驗(yàn)來驗(yàn)證模型的精確性;研究大型切屑的卷曲過程,揭示切屑的生成機(jī)理;分析重載條件下切屑的折斷力學(xué)特性,為大型切屑的卷曲和折斷研究提供理論參考。其次,對重型切削變形區(qū)的溫度場進(jìn)行研究,推導(dǎo)出剪切區(qū)和刀-屑接觸區(qū)溫度的計(jì)算公式;通過刀具磨損試驗(yàn)并借助有限元仿真技術(shù),對切削溫度與刀具磨損的關(guān)系進(jìn)行定量分析,建立刀具前刀面磨損模型。再次,進(jìn)行切削試驗(yàn),測量切削溫度、切削力并收集不同參數(shù)下的切屑,為切削力模型的預(yù)測提供試驗(yàn)數(shù)據(jù);磨制硬質(zhì)合金棒進(jìn)行高溫拉伸試驗(yàn),研究刀具材料的高溫力學(xué)特性。最后,建立車削2.25Cr1-Mo-0.25V鋼的有限元仿真模型,對不同切削參數(shù)下的切削力、切削溫度和應(yīng)力分布情況進(jìn)行研究,進(jìn)而驗(yàn)證切削力模型的有效性;進(jìn)行正交試驗(yàn),優(yōu)選出最佳切削用量。
[Abstract]:2.25Cr-1Mo-0.25V steel is widely used in petroleum and energy industry in China. It is an important part of hydrogenation reactor tube material. The material itself has the advantages of high strength, good plasticity and high temperature resistance, so it is a difficult material to process. In heavy-duty cutting, the cutting depth and feed rate are large, and the cutting temperature and cutting force are also very large. Under the combined action of heat-force, the tool wear will be affected to a certain extent. In order to solve the problems of low machining efficiency and serious tool wear, the thermo-force distribution in the cutting deformation area under heavy load cutting is studied and its distribution law is grasped. Firstly, based on the cutting force coefficient of the front cutting face, the prediction model of the cutting force on the front cutting face is established, and the accuracy of the model is verified by experiments, and the crimp process of the large chip is studied to reveal the mechanism of chip formation. The mechanical properties of chip breaking under heavy load are analyzed, which provides a theoretical reference for the study of large chip crimp and fracture. Secondly, the temperature field in the deformation region of heavy duty cutting is studied, and the formulas for calculating the temperature of shear zone and cutter chip contact zone are derived, and the cutting tool wear test and finite element simulation technology are used to calculate the temperature of the shear zone and the contact zone of cutter and chip. The relationship between cutting temperature and tool wear was quantitatively analyzed, and a tool front wear model was established. Thirdly, cutting test, measuring cutting temperature, cutting force and collecting chip under different parameters provide test data for prediction of cutting force model. The high temperature mechanical properties of cutting tool materials are studied. Finally, the finite element simulation model of turning 2.25Cr1-Mo-0.25V steel is established, the cutting force, cutting temperature and stress distribution under different cutting parameters are studied, and the validity of the cutting force model is verified. Select the best cutting parameters.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG501

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本文編號(hào)：1963106