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Ruled surface adaptively measuring method based on constant contact force

A measurement method and contact force technology, applied in the direction of measuring devices, instruments, etc., can solve the problems of many measuring points and slow measuring speed

Active Publication Date: 2015-06-10
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] Domestic coordinate measuring instruments mostly use the microplane method to correct the radius, but this method uses "3+2" for correction, there are too many measuring points, and the measurement speed is relatively slow

Method used

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  • Ruled surface adaptively measuring method based on constant contact force
  • Ruled surface adaptively measuring method based on constant contact force
  • Ruled surface adaptively measuring method based on constant contact force

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Embodiment Construction

[0036] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0037] see Figure 2~4 , the embodiment of the present invention includes the following steps:

[0038] 1) Divide the measured surface into grids at equal intervals in the x and z directions;

[0039] 2) Move the probe to the initial position of the surface part to be tested (see image 3 point A1);

[0040] 3) Apply a small displacement along the normal direction of the measured surface, and obtain the contact force through the probe stiffness and displacement. The specific algorithm is:

[0041] f y =(y 1 -y 0 )×k y

[0042] Among them, F y is the component of the contact force between the probe and the measured surface in the direction of the coordinate axis y-axis. k y is the stiffness of the probe in the y direction of the measurement coordinate system; y 0 is the y-axis coordinate value of the initial position of the probe; y 1 is t...

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Abstract

A ruled surface adaptively measuring method based on constant contact force relates to measurement of curved parts. The method comprises performing grid division on a surface to be measured, obtaining the contact force of the unit node of a complex curved surface to be measured as well as the coordinate of a measuring head, and predicting the displacement change of a probe with constant contact force according to subgradient size and direction change; during the surface measurement, reutilizing the position coordinates of unit nodes on a parallel measurement route to effectively improve the measurement efficiency; adaptively completing measurement of the complex curved surface composed of ruled surfaces without changing measurement hardware to obtain high practicality, to effectively improve the measurement efficiency and to reduce the operating processes. Meanwhile, according to the ruled surface adaptively measuring method based on the constant contact surface, direct radius compensation is performed on measured points through an element method, the adjusting displacement of a second contact point is predicated through a subgradient method, and during route planning, measured data of unit cross nodes are reutilized, so that the measurement efficiency can be effectively improved.

Description

technical field [0001] The invention relates to the measurement of curved surface parts, in particular to an adaptive measurement method for ruled surface based on constant contact force. Background technique [0002] Coordinate measuring instrument is a large-scale precision measuring instrument integrating machinery, control, and computer technology. It is widely used in the industrial field, especially for measuring curved surfaces and other parts that are difficult to evaluate the quality of processing shape and position. As the most important part of the measuring instrument, the measuring system has a great influence on the measuring accuracy. The probe part is generally composed of a contact probe 11 and a probe 12 fixedly connected (see figure 1 As shown, the mark P in the figure is the measured surface), use the guide rail to realize the movement in the corresponding direction and use the grating ruler to measure its moving position, and use the probe to detect the...

Claims

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Application Information

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IPC IPC(8): G01B21/00
CPCG01B21/00G01B21/20
Inventor 姚斌孙维方冯伟沈志煌张祥雷
Owner XIAMEN UNIV
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