本文選題：微徑球頭刀 + 微細(xì)銑削力�。� 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：在曲面微細(xì)銑削加工過程中,刀具由于受到切削力作用產(chǎn)生變形,導(dǎo)致讓刀誤差的產(chǎn)生。讓刀誤差的存在使工件精度降低,對(duì)工件性能產(chǎn)生影響。研究曲面微細(xì)銑削加工中的讓刀誤差,有助于對(duì)其進(jìn)行更好地控制,提高曲面銑削的精度。搭建了三軸超精密銑削實(shí)驗(yàn)平臺(tái),各軸采用直線電機(jī)驅(qū)動(dòng),并配有高速電主軸。對(duì)實(shí)驗(yàn)平臺(tái)空間幾何誤差進(jìn)行了補(bǔ)償,進(jìn)一步提升了平臺(tái)精度。在對(duì)切削刃曲線進(jìn)行數(shù)學(xué)描述的基礎(chǔ)上,建立了考慮刀具偏心影響的瞬時(shí)切厚計(jì)算模型,通過直接測量的方式獲取了刀具偏心參數(shù)。采用Z-Map法對(duì)曲面微細(xì)銑削過程中復(fù)雜的切觸環(huán)境進(jìn)行求解,獲取參與切削微元的分布。最終建立了考慮刀具偏心影響等因素的曲面微細(xì)銑削力預(yù)測模型。在微徑球頭銑刀靜剛度模型的基礎(chǔ)上,建立了考慮變形反饋的讓刀誤差模型。將刀具的空間形變投影到理想切觸點(diǎn)法平面內(nèi),對(duì)刀具變形和切削力進(jìn)行迭代運(yùn)算,求解得到平衡狀態(tài)下的讓刀誤差。該模型與未考慮變形反饋的模型相比,具有更高的預(yù)測精度。讓刀誤差補(bǔ)償后,刀具處于平衡狀態(tài)下的切削條件可以直接從補(bǔ)償前的理想刀位點(diǎn)處提取。使用刀具位于理想刀位點(diǎn)處的名義切削條件求取平衡狀態(tài)下的刀具變形,建立了基于切削力平衡的讓刀誤差補(bǔ)償模型。不同于雙層迭代讓刀誤差補(bǔ)償模型,基于切削力平衡的讓刀誤差補(bǔ)償模型的求解過程不依賴讓刀誤差預(yù)測模型,避免了耗時(shí)的迭代運(yùn)算,求解效率有較大提升。
[Abstract]:In the process of surface micro milling, the tool error is caused by the deformation of the cutting force. The existence of the tool error reduces the precision of the workpiece and influences the performance of the workpiece. It is helpful to control the cutter error in the micro milling of the surface and to improve the precision of the surface milling. The three axis ultra precision milling experiment platform was built, each axis was driven by linear motor and equipped with high speed motorized spindle. The spatial geometric error of the experimental platform was compensated, and the accuracy of the platform was further improved. On the basis of the mathematical description of the cutting edge curve, the instantaneous thickness calculation model with the influence of the tool eccentricity was established. The tool eccentricity parameters are obtained by the method of measurement. The Z-Map method is used to solve the complex cutting environment in the micro milling process and obtain the distribution of the involved cutting microelements. Finally, a micro milling force prediction model with the factors of cutting tool eccentricity is established. On the basis of the static stiffness model of the micro diameter ball end milling cutter, the model of the micro milling force is established. The tool error model is considered in consideration of the deformation feedback. The tool space deformation is projected into the ideal tangent contact plane, the tool deformation and the cutting force are iterated, and the cutter error is solved in the equilibrium state. The model has a higher prediction accuracy compared with the model without considering the deformation feedback. The cutting conditions in the equilibrium state can be extracted directly from the ideal knife site before the compensation. Using the nominal cutting conditions at the ideal knife site, the cutting tool deformation is obtained at the ideal knife site. The cutter error compensation model based on the cutting force balance is established. The cutter error compensation model is iterated by the different Yu Shuang layers, based on the cutting. The process of solving the error compensation model with force balance does not depend on the prediction model of cutter error. It avoids time-consuming iterative computation and improves the efficiency of the solution.
【學(xué)位授予單位】：華中科技大學(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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