Geometric Error Model and Precision Distribution Based on Reliability Theory for Large CNC Gantry Guideway Grinder

Antenna is an important and valuable component in industry. In order to protect it, the radome is adopted. As the non-uniform thickness of radome affects the performance of the antenna, in order to maintain the performance of antenna, it is necessary to have a dedicated device to detect the radome, thus the detection machine tool is used. The accuracy is the key point of the detection machine tool, so in this paper, its error model and measurement are presented. By the pitch compensation, the accuracy is enhanced, which achieves the desired value.

Download Full-text

Research on Geometric Error Model for Multi-Axis CNC Machines Based on Differential Transform

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.522.359 ◽

2012 ◽

Vol 522 ◽

pp. 359-363

Author(s):

Jian Xiong Chen ◽

Shu Wen Lin

Keyword(s):

Differential Operator ◽

Geometric Error ◽

Error Model ◽

Geometric Errors ◽

Cnc Machines ◽

Ideal Position ◽

Closed Chain ◽

Differential Movement ◽

Differential Transform ◽

Series Type

The geometric error of machine axis can be equivalent to the differential movement, regarded as a differential operator based on its ideal position. Thus, a new modeling method for multi-axis CNC machines based on differential transform theory is proposed in this paper. Firstly, the workpiece coordinate system is selected to observe the error of tools cutter location and orientation. Then, the kinematics chain of the machine will be consolidated into one, and the closed chain can be changed to open series type. The transform matrix is adopted to convert the differential operator between the different basis, because of the geometric errors have a different basis between measurement and modeling. Eventually, the general geometric error model for multi-axis machines is established after a XYFZ type three-axis machine is studied in detail.

Download Full-text

Volumetric accuracy analysis based on generalized geometric error model in multi-axis machine tools

Mechanism and Machine Theory ◽

10.1016/0094-114x(91)90084-h ◽

1991 ◽

Vol 26 (2) ◽

pp. 207-219 ◽

Cited By ~ 31

Author(s):

K. Kim ◽

M.K. Kim

Keyword(s):

Machine Tools ◽

Geometric Error ◽

Error Model ◽

Accuracy Analysis ◽

Volumetric Accuracy

Download Full-text

Research on Geometric Error Compensating Technique of CNC P3G Grinding Machine

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.462.287 ◽

2012 ◽

Vol 462 ◽

pp. 287-294 ◽

Cited By ~ 1

Author(s):

Yi Jian ◽

Qian Qian Li ◽

Hong Cheng ◽

Bin Wu Lai ◽

Jian Fei Zhang

Keyword(s):

Machine Tools ◽

Geometric Error ◽

Error Model ◽

Error Modeling ◽

Numerical Control ◽

Geometric Errors ◽

Real Time Control ◽

Time Control ◽

Applied Software ◽

Grinding Machine

Kinematic accuracy is a key reason which influence workpiece's geometric error precision on traditional working process of precisely CNC（Computerized Numerical Control）P3G（polygon profile with 3 lobes） grinding machine. A systematic geometric error model has been presented for CNC P3G grinding machine， proposed multi-body system theory integrate with the structure of CNC P3G grinding machine tools, researched on the machine's space geometric errors. By means of separate geometric errors from the machine tools, build geometric mathematical error model. Then, identify 21 error parameters through method of 9 lines, analysis and calculate the total space geometric errors of the workpiece and wheel. Finally, formed a parameter-list and applied software error compensational technique ， achieved real-time control to the motions of workpiece and wheel. Experimental results shown that the geometrical error modeling technique is accurate and efficient, and the precision of CNC P3G grinding machine is highly raised 70%.

Download Full-text

Geometric Error Analysis for Millimeter-Scale Machine Tool

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.507.101 ◽

2012 ◽

Vol 507 ◽

pp. 101-105

Author(s):

Jian Jun Li ◽

Xi Bing Li ◽

Jun An Liu ◽

Ke Xiang Wei

Keyword(s):

Error Analysis ◽

Machine Tool ◽

Geometric Error ◽

Error Model ◽

Market Competitiveness

At present, the trend of extreme product miniaturization is created. With increasing product compactness, the demand for precision miniature components is driven higher and the ability to manufacture these components accurately, swiftly and cost effectively is critical for manufacturers to maintain market competitiveness. The millimeter-scale machine tool (MMT) is on of the effective tool .This paper presents the error analysis for MMT which developed in our laboratory. The error model is developed and capability test is also implemented. The result shows that our MMT is very effective.

Download Full-text