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A new synchronous error control method for CNC machine tools with dual-driving systems

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Abstract

Driving an object along one axis with two driving systems is a common method for obtaining high acceleration and high trust force for a large CNC machine tool. However, if large synchronous movement error exists between the two driving systems, the machine will not be able to achieve high acceleration. Moreover, it may also cause serious structure deformation and damage to the machine. To solve this problem, a new control method integrating the model reference adaptive control and variable structure control was developed and verified in this study. The proposed method can determine and compensate on-line the synchronous movement errors between two driving systems so that the master driving unit and the slave driving unit of a dual-driving system can synchronously move with no large drag force and reach the desired acceleration. Experiments were performed on a gantry-type two-axis platform with a sliding 5-Kg metal block attached on the X-axis. The experimental results showed that the maximum and the average synchronous movement errors were reduced from 0.061 mm to 0.040 mm and from 0.032 mm to 0.013 mm, respectively.

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Abbreviations

D:

desired moving displacement of the system

Ds :

current moving displacement of the system

Vs :

moving velocity of the system

Cs :

damper of the slave system

Ms :

mass of the slave system

F0 :

stopping force at e c

ec :

rated control voltage

V 0 :

velocity at the rated voltage

F 1 :

thrust force acting on the system

C 2 :

coefficient of x 2

τ l :

torque of the platform

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chung Yuan Christian University, Chung-Li, 32023, Taiwan

    Shih-Ming Wang, Ren-Jeng Wang & Shambaljamts Tsooj

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  1. Shih-Ming Wang
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  2. Ren-Jeng Wang
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  3. Shambaljamts Tsooj
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Correspondence to Shih-Ming Wang.

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Wang, SM., Wang, RJ. & Tsooj, S. A new synchronous error control method for CNC machine tools with dual-driving systems. Int. J. Precis. Eng. Manuf. 14, 1415–1419 (2013). https://doi.org/10.1007/s12541-013-0191-y

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  • DOI: https://doi.org/10.1007/s12541-013-0191-y

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