A general identification method for position-dependent geometric errors of rotary axis with single-axis driven

2021 ◽  
Author(s):  
Kai Xu ◽  
Guolong Li ◽  
Zheyu Li ◽  
Xin Dong ◽  
Changjiu Xia
Keyword(s):  
Geometric Errors ◽  
Rotary Axis ◽  
Identification Method

scholarly journals Rapid Measurement and Identification Method for the Geometric Errors of CNC Machine Tools

2019 ◽  
Vol 9 (13) ◽  
pp. 2701 ◽  
Author(s):  
Li ◽  
Yang ◽  
Gao ◽  
Su ◽  
Wei ◽  
...  
Keyword(s):  
Error Compensation ◽  
Machine Tools ◽  
Degrees Of Freedom ◽  
Cnc Machine Tools ◽  
Geometric Errors ◽  
Two Dimensional ◽  
Cnc Machine ◽  
Angle Sensor ◽  
Identification Method ◽  
Measuring Machine

Error compensation technology offers a significant means for improving the geometric accuracy of CNC machine tools (MTs) as well as extending their service life. Measurement and identification are important prerequisites for error compensation. In this study, a measurement system, mainly composed of a self-developed micro-angle sensor and an L-shape standard piece, is proposed. Meanwhile, a stepwise identification method, based on an integrated error model, is established. In one measurement, four degrees-of-freedom errors, including two-dimensional displacement and two-dimensional angle of a linear guideway, can be obtained. Furthermore, in accordance with the stepwise identification method, the L-shape standard piece is placed in three different planes, so that the measurement and identification of all 21 geometric errors can be implemented. An experiment is carried out on a coordinate measuring machine (CMM) to verify the system. The residual error of the angle error, translation error and squareness error are 1.5″, 2 μm and 3.37″, respectively, and these are compared to the values detected by a Renishaw laser interferometer.

A method to decouple the geometric errors for rotary axis in a five-axis CNC machine

2020 ◽  
Vol 31 (8) ◽  
pp. 085007
Author(s):  
Ruijun Liang ◽  
Wei Li ◽  
Zhiqiang Wang ◽  
Lei He
Keyword(s):  
Geometric Errors ◽  
Cnc Machine ◽  
Rotary Axis ◽  
Five Axis

scholarly journals Identification Method of Error Motions and Geometric Errors of a Rotary Axis by R-Test

2020 ◽  
Vol 14 (3) ◽  
pp. 399-408
Author(s):  
Takaaki Kenno ◽  
Ryuta Sato ◽  
Keiichi Shirase ◽  
Shigemasa Natsume ◽  
Henny Spaan ◽  
...  
Keyword(s):  
High Precision ◽  
Machine Tools ◽  
Geometric Errors ◽  
Rotary Table ◽  
Test Device ◽  
Motion Error ◽  
Rotary Axis ◽  
Measurement Results ◽  
Reference Sphere ◽  
Precision Machine Tools

While evaluating the accuracy of high-precision machine tools, it is critical to reduce the error factors contributing to the measured results as much as possible. This study aims to evaluate both the error motions and geometric errors of the rotary axis without considering the influence of motion error of the linear axis. In this study, only the rotary axis is moved considering two different settings of a reference sphere, and the linear axes are not moved. The motion accuracy of the rotary axis is measured using the R-test device, both the error motions and geometric errors of the rotary axis are identified from the measurement results. Moreover, the identified geometric errors are verified for correctness via measurement with an intentional angular error. The results clarify that the proposed method can identify the error motions and geometric errors of a rotary axis correctly. The method proposed in this study can thus be effective for evaluating the motion accuracy of the rotary axis and can contribute to further improvement of the accuracy of the rotary table.

Observation of Thermal Influence on Error Motions of Rotary Axes on a Five-Axis Machine Tool by Static R-Test

2012 ◽  
Vol 6 (2) ◽  
pp. 196-204 ◽  
Author(s):  
Cefu Hong ◽  
◽  
Soichi Ibaraki
Keyword(s):  
Machine Tools ◽  
Single Point ◽  
Geometric Errors ◽  
Thermal Tests ◽  
Thermally Induced ◽  
Rotary Axis ◽  
Spindle Rotation ◽  
Thermal Changes ◽  
Thermal Influence ◽  
Five Axis

Thermal distortions are regarded as one of the major error factors in machine tools. ISO 230-3 and ISO 10791-10 describe tests to evaluate the influence of thermal distortions caused by linear motion and spindle rotation on the Tool Center Position (TCP). However, for five-axis machine tools, no thermal test is described for a rotary axis. Therefore, in this paper, a method for observing thermally induced geometric errors of a rotary axis with a static R-test is proposed. Unlike conventional thermal tests in ISO 230-3 and ISO 10791-10, where the thermal influence on the positioning error at a single point is tested, the present test measures the thermal influence on the error motions of a rotary axis. The R-test measurement clarifies how the error motions of a rotary table change with the rotation of a swiveling axis and how they are influenced by thermal changes. The thermal influence on the error motions of a rotary axis is quantitatively parameterized by geometric errors that vary with time.

A Five-Axis Machining Error Simulator for Rotary-Axis Geometric Errors Using Commercial Machining Simulation Software

2017 ◽  
Vol 11 (2) ◽  
pp. 179-187 ◽  
Author(s):  
Soichi Ibaraki ◽  
◽  
Ibuki Yoshida ◽  
Keyword(s):  
Kinematic Model ◽  
Simulation Software ◽  
Geometric Errors ◽  
Machining Simulation ◽  
Machining Error ◽  
Rotary Axis ◽  
Tool Paths ◽  
Numerical Fitting ◽  
Machining Test ◽  
Five Axis

This paper presents a simulator that graphically presents the influence of rotary-axis geometric errors on the geometry of a finished workpiece. Commercial machining simulation software is employed for application to arbitrary five-axis tool paths. A five-axis kinematic model is implemented with the simulator to calculate the influence of rotary-axis geometric errors. The machining error simulation is demonstrated for 1) the cone frustum machining test described in ISO 10791-7:2015 [1], and 2) the pyramid-shaped machining test proposed by some of the authors in [2]. The influences of the possible geometric errors are simulated in advance. By comparing the measured geometry of the finished workpiece to the simulated profiles, major error causes are identified without numerical fitting to the machine’s kinematic model.

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