Estimating Specific Cutting Constants via First Harmonic Force Components in Conventional End Milling Operations

在傳統銑削過程中利用第一諧波分力來估算比切削常數

鄭嘉敏(Charles Ming Zheng) ； 巴布(Kadirikota Rajesh Babu)

《中國機械工程學刊》 40卷6期 (2019/12) Pp. 625-634

摘要

Charge seepage in piezoelectric sensor often causes a zero-drift problem in measuring cutting force, which can influence the ability to get accurate cutting forces and cutting constants to monitor milling process with a long duration. To overcome this difficulty, a robust method for extracting cutting constants at any moment in milling by only using the measured first harmonic force components is presented. There are two steps in this method for estimating cutting constants. The first is to find the approximations of cutting constants from the ratio of the measured first harmonic force components, and the second utilizes the equations from the components of magnitude of first harmonic force as well as the approximations of cutting constants calculated in the first step to obtain the refined cutting constants by least square method. This paper also discusses the limitations of presented method. The validity of the proposed method is confirmed through milling experiments.

關鍵字

milling ； first harmonic force ； cutting constants ； LGCC

並列摘要

壓電感測器中的電流滲漏經常導致使用動力計的力量信號漂移問題，這問題將導致難以獲得準確的切削力來識別用於連續監測長時間銑削過程的切削常數。為了克服這個困難，本文提出了一種在銑削中的任何時刻僅使用第一諧波分力來辯識切削常數的穩健方法。該方法利用兩個步驟來估算切削常數。第一步是利用測量所得的第一諧波分力的比值中找出切削常數的近似值，第二步是利用最小平方法根據第一諧波力分力的大小以及步驟一所得的切削常數近似值得來獲得更精確的切削常數。本文還討論了所提方法的局限性並通過銑削實驗證實了該方法的有效性。