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RESEARCH PAPER
Enhancing machining accuracy reliability of multi-axis CNC Indexed by: machine tools using an advanced importance sampling method
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School of Mechanical and Electronic Engineering, Lanzhou University of Technology, Lanzhou 730050, China
 
 
Publication date: 2021-09-30
 
 
Eksploatacja i Niezawodność – Maintenance and Reliability 2021;23(3):559-568
 
HIGHLIGHTS
  • An accuracy allocation method for CNC machine tools is proposed.
  • The error is presented by using the differential motion matrix and reliability theory.
  • The machining accuracy reliability is given by an advanced importance sampling method.
  • The effectiveness is validated by a CNC grinding machine.
KEYWORDS
ABSTRACT
The purpose of this paper is to propose a general precision allocation method to improve machining performance of CNC machine tools based on certain design requirements. A comprehensive error model of machine tools is established by using the differential motion relation of coordinate frames. Based on the comprehensive error model, a reliability model is established by updating the primary reliability with an advanced importance sampling method, which is used to predict the machining accuracy reliability of machine tools. Besides, to identify and optimize geometric error parameters which have a great influence on machining accuracy reliability of machine tools, the sensitivity analysis of machining accuracy is carried out by improved first-order second-moment method. Taking a large CNC gantry guide rail grinder as an example, the optimization results show that the method is effective and can realize reliability optimization of machining accuracy.
 
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eISSN:2956-3860
ISSN:1507-2711
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