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Computing method for calibrating hinge coordinates of parallel machine tool

A calculation method and coordinate technology, which are applied in the calculation field of calibrating the hinge coordinates of a parallel machine tool, can solve the problems of an error in the hinge coordinates of a parallel machine tool, difficult to compensate for the machining error of a parallel machine tool, and a large error error, and achieve the effect of high precision and improved accuracy.

Inactive Publication Date: 2015-05-20
天津万达鼎睿供应链有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The accuracy of the parallel machine tool hinge coordinates is the basis of the parallel machine tool accuracy. Errors in the parallel machine tool hinge coordinates will affect the processing accuracy of the parallel machine tool and make it difficult to compensate for the processing error of the parallel machine tool
[0003] In the calculation of the existing hinge coordinates of parallel machine tools, damped least square method, Gauss-Newton iterative method, genetic algorithm and particle swarm algorithm are used for optimization calculation. When the true value of the hinge coordinates of parallel machine tools is constant, the Initial value, sometimes the hinge coordinate value calculated by these methods has a larger error than the initial value error of the parallel machine tool hinge coordinate. If this hinge coordinate value is used on the parallel machine tool, the accuracy of the parallel machine tool hinge coordinate will be reduced. , which is unacceptable

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  • Computing method for calibrating hinge coordinates of parallel machine tool
  • Computing method for calibrating hinge coordinates of parallel machine tool
  • Computing method for calibrating hinge coordinates of parallel machine tool

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: take figure 2 The initial deviation of the hinge coordinates of the parallel machine tool shown is -1.0100mm, and 37 poses of the moving platform are selected to calculate the hinge coordinates of the parallel machine tool.

[0024] The first step: an optimization of the hinge coordinates of the parallel machine tool.

[0025] In the working space of the parallel machine tool, select 7 poses of the moving platform (see Table 1) as the optimal search poses of the moving platform, the number of poses of the moving platform k=7, and then select the initial value of the hinge coordinates of the parallel machine tool u e0(See Table 3), according to formula (1), with the minimum residual error of the relative rod length variation of the parallel machine tool as the objective function, the first-time optimal value u of the hinge coordinates of the parallel machine tool is obtained by the damped least square method e1 .

[0026] Then add 30 poses and poses of ...

Embodiment 2

[0061] Embodiment 2: take figure 2 The initial deviation of the hinge coordinates of the parallel machine tool shown is -0.5100mm, and the data has a one-way deviation. Select 40 poses of the moving platform to calculate the hinge coordinates of the parallel machine tool.

[0062] One optimization is performed first, and then the second optimization is performed to obtain the result. The calculation method and steps for calibrating the hinge coordinates of the parallel machine tool are the same as those in Embodiment 1.

[0063] Select 7 poses of the moving platform as shown in Table 6, and then add 33 poses of the selected moving platform in the work space of the parallel machine tool, and obtain a total of 40 poses of the moving platform as shown in Table 7, and perform a calculation of the hinge coordinates of the parallel machine tool Optimization, to get the first-time optimized value u of the hinge coordinates e1 and an optimization objective function f k-1 See Table ...

Embodiment 3

[0084] Embodiment 3: take figure 2 The initial value and initial deviation of the hinge coordinates of the parallel machine tool shown are the same as those in Embodiment 2, respectively, and 40 poses of the moving platform are selected to calculate the hinge coordinates of the parallel machine tool.

[0085] One optimization is performed first, and then the second optimization is performed to obtain the result. The calculation method and steps for calibrating the hinge coordinates of the parallel machine tool are the same as those in Embodiment 1.

[0086] Select the 7 poses of the moving platform as shown in Table 11, and then add 33 poses of the selected moving platform in the workspace of the parallel machine tool to obtain 40 poses of the moving platform, see Table 12, and perform a calculation of the hinge coordinates of the parallel machine tool Optimization, the first-time optimized value u of the hinge coordinates obtained e1 and an optimization objective function f...

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Abstract

The invention discloses a computing method for calibrating the hinge coordinates of a parallel machine tool. The method comprises the following steps: computing and obtaining the hinge coordinates of the parallel machine tool through twice optimization of the hinge coordinates of the parallel machine tool; in the primary optimization of the hinge coordinates, using the residual error minimum of a relative rod length variable quantity of the parallel machine tool as an objective function, and using a damped least square method to obtain the primary optimized value of the hinge coordinates, so that the primary optimized results of the hinge coordinates are the primary optimized value and the primary optimized objective function of the hinge coordinates; in the secondary optimization of the hinge coordinates, using the primary optimized value of the hinge coordinates as gridding center coordinates, respectively adding and reducing one step size of six coordinates along the vertical direction on a fixed platform to form gridding original points, using the damped least square method to optimize each gridding original point, and taking an optimal solution, so that the secondary optimized results of the hinge coordinates are the secondary optimized value and the secondary optimized objective function of the hinge coordinates. The method is used for computing the hinge coordinates of the calibrated parallel machine tool, and the computing accuracy of calibrating the hinge coordinates of the parallel machine tool is improved.

Description

technical field [0001] The invention relates to the calibration of the hinge coordinates of a parallel machine tool, in particular to a calculation method for calibrating the hinge coordinates of a parallel machine tool. Background technique [0002] The accuracy of the parallel machine tool hinge coordinates is the basis of the parallel machine tool's accuracy. Errors in the parallel machine tool hinge coordinates will affect the processing accuracy of the parallel machine tool and make it difficult to compensate for the processing error of the parallel machine tool. [0003] In the calculation of the existing hinge coordinates of parallel machine tools, damped least square method, Gauss-Newton iterative method, genetic algorithm and particle swarm algorithm are used for optimization calculation. When the true value of the hinge coordinates of parallel machine tools is constant, the Initial value, sometimes the hinge coordinate value calculated by these methods has a larger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00
CPCG01B21/00
Inventor 许兆棠吴海兵陈小岗刘远伟张恒张磊吴蒙蒙
Owner 天津万达鼎睿供应链有限公司