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Research on Technology of Reliability Enhancement Testing for the CNC System

Author: LiZuo
Tutor: ZhongZuoNing
School: Hubei University of Technology
Course: Measuring Technology and Instruments
Keywords: CNC system Reliability Failure Analysis Reliability Enhancement Testing Failure mechanism
CLC: TG659
Type: Master's thesis
Year: 2011
Downloads: 133
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Abstract


CNC system reliability are key issues restricting the development of numerical control system in China industry , numerical control machine tool industry . Domestic CNC system due to factors such as work environment , the quality of the parts and technology level , its reliability and foreign famous brands some gaps. In this thesis, a model CNC system as the research object , study its reliability enhancement testing technology , explore accelerate failure mechanisms , and provide the basis for effective to improve the reliability of NC system . Field failure data collected CNC system failure statistical analysis and failure mode of critical subsystems , impact and criticality analysis (FMECA ) , found that the reliability of the weak links , key devices to determine the impact of the NC system reliability and the main reason. Censored time of 208 hours reliability accelerated testing is mainly based on failure statistical analysis , to determine the numerical control panel and motherboard CNC system failure frequency larger key parts to identify the influence of work stress and environmental stress . At the same time monitoring and analysis of key components motherboard chip and display power module , derived chip and accelerated failure of the power supply variation and the impact of the external and internal failure . Reliability Enhancement Testing Technology , CNC system based on accelerated testing of the reliability of the results , the design of a cross-sectional view of a typical test reliability enhancement testing , and use QUALMARK the HALT / HASS reliability test system of numerical control system reliability strengthen the test, including high and low temperature cycle test and axis random vibration test to verify the reliability enhancement testing the effectiveness of the technology , and provide a strong basis for the reliability improvements , and to provide technical support for the further application of reliability enhancement test . Finally, the chip key components for CNC systems and power supply modules , the depth of its internal structure and working principle failure mechanism analysis , analysis of the chip with power in the design , manufacture and use of the process may lead to the failure of reason , and combined with the failure mechanism analysis put forward some improvement measures .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Program control machine tools, CNC machine tools and machining
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