VOLUMETRIC ERROR COMPENSATION IN FIVE-AXIS CNC MACHINING CENTER THROUGH KINEMATICS MODELING OF GEOMETRIC ERROR
Milad Pouya 2  
 
 
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1
School of Mechanical Engineering, Islamic Azad University, Science and Research Branch of Tehran (Central), Hesarak, Tehran, Iran
2
School of Mechanical Engineering, International Pardis, University of Guilan, Rasht, Iran
Publish date: 2016-06-10
 
Adv. Sci. Technol. Res. J. 2016; 10(30):207–217
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ABSTRACT
Accuracy of a five-axis CNC machine tool is affected by a vast number of error sources. This paper investigates volumetric error modeling and its compensation to the basis for creation of new tool path for improvement of work pieces accuracy. The volumetric error model of a five-axis machine tool with the configuration RTTTR (tilting head B-axis and rotary table in work piece side A΄) was set up taking into consideration rigid body kinematics and homogeneous transformation matrix, in which 37 error components are included. Volumetric error comprises 37 error components that can separately reduce geometrical and dimensional accuracy of work pieces. The machining accuracy of work piece is guaranteed due to the position of the cutting tool center point (TCP) relative to the work piece. The cutting tool is deviated from its ideal position relative to the work piece and machining error is experienced. For compensation process detection of the present tool path and analysis of the RTTTR five-axis CNC machine tools geometrical error, translating current position of component to compensated positions using the Kinematics error model, converting newly created component to new tool paths using the compensation algorithms and finally editing old G-codes using G-code generator algorithm have been employed.