Integrated Five-Axis Trajectory Shaping and Contour Error Compensation for High-Speed CNC Machine Tools

2014 ◽  
Vol 19 (6) ◽  
pp. 1859-1871 ◽  
Author(s):  
Mohammad R. Khoshdarregi ◽  
Svenja Tappe ◽  
Yusuf Altintas
Keyword(s):  
Error Compensation ◽  
Machine Tools ◽  
High Speed ◽  
Cnc Machine Tools ◽  
Contour Error ◽  
Cnc Machine ◽  
Five Axis

Smooth Cornering Strategy for High Speed CNC Machine Tools With Confined Contour Error

2016 ◽  
Author(s):  
Shingo Tajima ◽  
Burak Sencer
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Cnc Machine Tools ◽  
Contour Error ◽  
Smoothing Algorithm ◽  
Cnc Machine ◽  
Computationally Efficient ◽  
Positioning Systems ◽  
Tool Paths ◽  
Time Optimal

Conventional tool-paths for CNC (computer numerical controlled) machine tools or NC positioning systems are mainly composed of linear motion segments, or so called the G1 commands. Interpolating along linear tool-paths exhibits serious limitations in terms of achieving the desired part geometry and productivity in high-speed machining. Velocity and acceleration discontinuities occur at the junction points of consecutive segments. In order to generate smooth and continuous feed motion, a kinematic corner smoothing algorithm is proposed in this paper, which plans smooth acceleration and jerk profiles around the segment junction to realize continuous velocity transition between consecutive linear segments. The proposed corner-smoothing algorithm eliminates the need for geometry based corner-blending techniques and presents a computationally efficient interpolation scheme. The cornering error is controlled analytically allowing the end-user to control the cornering tolerance. Drive’s acceleration and the jerk limits are fully utilized to minimize overall cornering duration. This delivers a time optimal cornering motion within user specified cornering error tolerances. Simulation studies are used to demonstrate the effectiveness of proposed high-speed cornering scheme.

A New Test Part for Detecting Processing Accuracy of Five Axis CNC Machine Tools

2012 ◽  
Vol 468-471 ◽  
pp. 161-167 ◽  
Author(s):  
Rong Bo Shi ◽  
Ji Ming Yan ◽  
Zhi Ping Guo ◽  
Zhi Yong Song ◽  
Zhi Jun Peng
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Surface Errors ◽  
Test Part ◽  
Part Surface ◽  
Processing Accuracy ◽  
Five Axis ◽  
Large Aircraft

Five axis linkage CNC machine tools, with its high speed, high precision characteristics, are widely used in large aircraft structure part machining. By trial cutting method, "S" test part is a new test part for detecting processing accuracy of five-axis linkage machine tools. Through analysis and simulation, exploring the influencing factors to CNC machine tools processing accuracy and the regular of "S" test part surface errors, surface quality, results show that "S" test part can reflect the processing accuracy of CNC machine tools.

scholarly journals On-Machine Measurement and Error Compensation for 6061 Aluminum Alloy Hexagonal Punch Using a Turn-Milling Machine

Machines ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 180
Author(s):  
Cheng-Hsien Kuo ◽  
Po-Cheng Chen
Keyword(s):  
Aluminum Alloy ◽  
Error Compensation ◽  
Machine Tools ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Milling Machine ◽  
Tolerance Range ◽  
Cnc Machine ◽  
Rough Machining ◽  
Five Axis

For machining parts with complex shapes, consisting of computer numerical control (CNC) machine tools, different CNC machine tools will be used according to the machining method. If the workpiece is removed for off-machine measurement after machining, when the size is incorrect, it will need to be returned to the CNC machine tool for secondary machining. In this case, the workpiece surface quality and machining accuracy will be affected, which is very time-consuming. On-machine measurement and complex machine center is a key to solve this problem. In the recent researches that the touch probe was integrated on three or five axis machine for error compensation and shape construction based on on-machine measurement, but turning-milling machine was rare. In addition, the most types of parts were thin-walled parts or thin web parts. In this study, a contact measurement system is integrated into a CNC combined turning-milling machine for on-machine measuring. Macro-programming is used to design the machining path of A6061-T6 aluminum alloy hexagonal punch, and the action of probe measurement is added to the machining path. As the measured data exceed the tolerance range, the calculated data are fed back to the controller for machining improvement by compensation. The finished hexagonal punch is measured in a 3D coordinate measuring machine and the error is compared. The experimental results show that the contact probe needs to be corrected before machining, and the size of the corrected workpiece can reach the tolerance range of ±0.01 mm. The size error of rough machining is larger than that of fined machining, and the size error of rough machining will increase with the length of the workpiece.

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