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Geometric accuracy on-line monitoring method of numerical control machine tool

A technology of geometric precision and CNC machine tools, which is applied in the field of CNC machine tools, can solve the problems of long-term geometric precision of CNC machine tools, and achieve the effects of small space occupation, high measurement accuracy and good adaptability

Active Publication Date: 2017-07-28
DALIAN UNIV OF TECH
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  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing methods, aiming at the problem of long-term and online monitoring of the geometric accuracy of CNC machine tools in the service process, a method for online monitoring of the geometric accuracy of CNC machine tools is invented

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  • Geometric accuracy on-line monitoring method of numerical control machine tool
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  • Geometric accuracy on-line monitoring method of numerical control machine tool

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] The CNC machine tool under test is a bed of a vertical machining center, the length of the guide rails L1 and L2 is 1060mm, the inner distance between the guide rails L1 and L2 is 770mm, and the height of the bed is 550mm.

[0043] Step 1 Arrangement of strain measuring points

[0044] On the upper and lower edges of the first side surface S1 of the CNC machine tool bed 1, the upper and lower edges of the second side surface S2, and the edges of the inner sides of the two guide rails on the upper surface S3, the strain gauges are evenly pasted, the number of strain gauges on each surface, k=[(1060 / 250)+3]=3. The distance between adjacent strain gauges of the first side surface S1 , the second side surface S2 , and the upper surface S3 along the rail direction s is d=(2×1060) / (6-2)=530. The middle sensitive grid of the strain gauge p...

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Abstract

The invention belongs to the technical field of a numerical control machine tool and relates to a geometric accuracy on-line monitoring method of a numerical control machine tool. The geometric accuracy on-line monitoring method of a numerical control machine tool includes the steps: pasting a foil gauge on the surface of a machine tool basic part; through a constructed wireless strain monitoring system, acquiring and remotely transmitting the strain data of each discrete measuring point; taking the discrete strain data as the boundary condition, solving a stress equation satisfying a biharmonic function, predicting the strain field distribution on the surface of the basic part of the machine tool, and obtaining the deformation state of the basic part of the machine tool through integration; and by means of an end point line connecting method to solve the linearity of the basic part of the machine tool. The geometric accuracy on-line monitoring method of a numerical control machine tool has the advantages of being high in precision and adaptability, and can synchronously perform measurement and processing without interference. The strain data is transmitted through the wireless detection system, so that the geometric accuracy on-line monitoring method of a numerical control machine tool occupies less space, and provides important data support for maintenance of the machine tool, early warning of fault, and autonomous maintenance.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, in particular to an online monitoring method for the geometric accuracy of numerical control machine tools. Background technique [0002] The geometric accuracy of the basic parts of the CNC machine tool (such as the bed, column, etc.) is the basis for the accuracy of the machine tool, such as the straightness of the mounting surface of the bed guide rail. During the long-term service of CNC machine tools, due to the influence of vibration, heat and other factors, the internal residual internal stress and assembly stress of the basic parts of the machine tool are released and the weight balance is significant, which in turn causes complex stress deformation of the basic parts, resulting in the inevitable geometric accuracy of the machine tool. deterioration, decline. The acquisition of the change law of the geometric accuracy of the machine tool is not only important for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/4065
CPCG05B19/4065G05B2219/37616
Inventor 王永青吴嘉锟刘志松刘海波况康刘阔盛贤君
Owner DALIAN UNIV OF TECH
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