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Method for evaluating service reliability of numerical control equipment

A reliability and equipment technology, applied in the direction of program control, computer control, general control system, etc., can solve the problem that the function and technical performance of CNC equipment cannot meet the specified requirements, reduce the production efficiency and utilization rate of CNC equipment, and do not consider reliability dynamics changes, etc.

Inactive Publication Date: 2009-09-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

In fact, due to changes in external conditions such as machining conditions, machining process parameters, uneven distribution of workpiece allowance, ambient temperature and lubrication during the service period or processing process of CNC equipment, the functions and technical performance of CNC equipment often fail to meet the specified requirements. Thereby reducing the service reliability of CNC equipment
Since the existing service reliability evaluation technology does not consider the dynamic changes in reliability caused by changes in external conditions, end users often adopt conservative ways of sacrificing performance when operating CNC equipment, which reduces the production efficiency and utilization of CNC equipment. Rate

Method used

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  • Method for evaluating service reliability of numerical control equipment
  • Method for evaluating service reliability of numerical control equipment
  • Method for evaluating service reliability of numerical control equipment

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Embodiment

[0058] This embodiment provides the specific implementation process of the present invention in engineering practice, and at the same time verifies the effectiveness of the present invention.

[0059] refer to figure 2 , The feed servo system is an important functional component of CNC equipment, and it is the link between the CNC device and the mechanical transmission components. The technical indicators of CNC equipment, such as speed and acceleration, following error, positioning accuracy, and machined surface quality, depend to a large extent on the feed servo system. However, during the use of CNC equipment, the feed servo system is constantly affected by various random factors such as external disturbance, vibration, friction, thermal deformation, wear of guide rails and screw nut pairs, and changes in the characteristics of electronic components, causing the parameters of its mechanical transmission components to change. (Load mass, guide rail damping, system stiffnes...

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Abstract

The invention provides a method for evaluating service reliability of numerical control equipment. According to the original input and output vectors of data after zero dimension treatment, an optimized nonlinear regression function for the input-output of the numerical control equipment is obtained by using a support vector regression machine for training, and furthermore the indexes of the reliability such as point estimation, confidence interval and reliable sensitivity are solved by the self-adapting selective sampling method and bootstrap method. The method can accurately evaluate and predict the influence of different factors on the service reliability of the numerical control equipment under the condition of a small sample, find out a weak link of the numerical control equipment and indicate a direction of improving the design, manufacturing, process, maintenance and the like of the numerical control equipment.

Description

technical field [0001] The invention belongs to the technical field of numerical control equipment, in particular to a method for evaluating the service reliability of numerical control equipment. Background technique [0002] The service reliability of CNC equipment focuses on the maintenance of the function and technical performance of CNC equipment, emphasizing the quality characteristics of CNC equipment during service. The service reliability evaluation technology of NC equipment is a necessary means to quantitatively control the service reliability of NC equipment. Its main purpose is to measure whether the NC equipment meets the expected design goals and use requirements, and to point out the weak links in the operation of NC equipment. Point out the direction for improving the design, manufacture, process and maintenance of CNC equipment. [0003] Most of the existing NC equipment service reliability assessment technologies are based on the binary state (normal and ...

Claims

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Application Information

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IPC IPC(8): G05B19/406
Inventor 邵新宇吴军邓超毛宽民朱海平
Owner HUAZHONG UNIV OF SCI & TECH
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