A method to analyze the machining accuracy reliability sensitivity of machine tools based on Fast Markov Chain simulation

Cheng, Q.; Sun, B.; Zhao, Y.; Gu, P.

doi:10.17531/ein.2016.4.10

Artykuł - szczegóły

Tytuł artykułu

A method to analyze the machining accuracy reliability sensitivity of machine tools based on Fast Markov Chain simulation

Autorzy

Cheng Q. , Sun B. , Zhao Y. , Gu P.

Treść / Zawartość

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Identyfikatory

DOI

10.17531/ein.2016.4.10

Warianty tytułu

Podejście do analizy czułości niezawodnościowej dokładności obrabiarek oparte na symulacji metodą szybkich łańcuchów Markowa

Języki publikacji

Abstrakty

With the ever increasing demand of higher machining accuracies, the machining accuracy reliability has evolved into an indicator to evaluate the performance of a machine tool. Consequentially, methods for improving the machining accuracy reliability have become the focus of attention for both manufacturers and users. Generally, the intercoupling geometric errors are the main cause which may lead to a reduction of the machining accuracy of machine tools. In this paper, the machining accuracy reliability is defined as the ability of a machine tool to perform at its specified machining accuracy under the stated conditions for a given period of time, and a new approach for analyzing the machining accuracy reliability of machine tools based on fast Markov chain simulations is proposed. Using this method, seven different failure modes could be determined for a machine tool. An analysis of the machining accuracy reliability sensitivity was performed based on solving the integral of the failure probability of the machine tool, and the key geometric errors which most strongly affect the machining accuracy reliability were identified. Finally, in this study, a 4-axis machine tool was selected as an example to experimentally validate the effectiveness of the proposed method.

Wraz z wciąż rosnącym zapotrzebowaniem na coraz to wyższą dokładność obróbki, niezawodność dokładności obróbki stała się wskaźnikiem pozwalającym na ocenę charakterystyk obrabiarek. W rezultacie, metody doskonalenia niezawodności dokładności obróbki znalazły się w centrum uwagi zarówno producentów jak i użytkowników tych maszyn. Na ogół, do zmniejszenia dokładności obróbki prowadzą nakładające się błędy geometryczne. W niniejszej pracy, niezawodność dokładności obróbki zdefiniowano jako zdolność obrabiarki do pracy z określoną dla niej dokładnością w zadanych warunkach przez dany okres czasu. Zaproponowano nowe podejście do analizy niezawodności dokładności obróbki oparte na symulacji metodą szybkich łańcuchów Markowa. Za pomocą tej metody, można ustalić siedem różnych przyczyn uszkodzeń obrabiarki. Analizę czułości niezawodnościowej dokładności obróbki przeprowadzono obliczając całkę prawdopodobieństwa uszkodzenia obrabiarki. Określono także kluczowe błędy geometryczne, które najsilniej wpływają na niezawodność dokładności obróbki. Wreszcie, efektywność proponowanej metody sprawdzono doświadczalnie na przykładzie obrabiarki czteroosiowej.

Słowa kluczowe

machining accuracy reliability machine tool fast Markov Chain reliability sensitivity analysis integral of failure probability

niezawodność dokładności obróbki obrabiarka szybki łańcuch Markowa analiza czułości niezawodnościowej całka prawdopodobieństwa uszkodzenia

Wydawca

Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne

Czasopismo

Eksploatacja i Niezawodność

Rocznik

2016

Tom

Vol. 18, no. 4

Strony

552--564

Opis fizyczny

Bibliogr. 32 poz., rys., tab.

Twórcy

autor

Cheng Q.

chengqiang@bjut.edu.cn

Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100124, China

autor

Sun B.

1359750743@qq.com

Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100124, China

autor

Zhao Y.

yszhao@bjut.edu.cn

Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100124, China

autor

Gu P.

gupeihua@aliyun.com

Department of Mechatronics Engineering, Shantou University, Shantou, Guangdong, 515063, China

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Bibliografia

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