Abstract
An S-shaped machining test is proposed for the ISO 10791-7 standard to verify the performance of five-axis machining centers. However, investigation of the factor that has the most influence on the geometrical accuracy of finished S-shaped workpieces has not been undertaken. Determination of the influence of NC program tolerance and geometric errors concerning the rotary axes on the accuracy of the finished S-shaped workpiece forms the main objective of the study. Actual cutting experiments as well as simulations were performed during the proposed investigation. Our results clarify that NC-program tolerance has a significant influence on the end quality of the machined surface. Although geometric errors pertaining to rotary axes also have a significant influence on machined-surface quality, it is difficult to evaluate the influence of each individual error, because all geometric errors make glitches at the same point on the machined surface. The proposed S-shaped machining test can be used to provide a complete demonstration of available machining techniques.
Highlights
Five-axis machining centers can control both the orientation and position of the tool with respect to the workpiece
The use of five-axis machining centers offers many advantages, some drawbacks do exist in their operation
Perhaps the most significant disadvantage is that the motion accuracy of five-axis machining centers is typically lower than the conventional three-axis machining centers
Summary
Five-axis machining centers can control both the orientation and position of the tool with respect to the workpiece. Bringmann and Knapp [6] proposed a method to identify geometric errors by making use of a measurement system called “R-test,” which comprises a reference sphere and displacement sensors [7] These evaluation methods have been implemented into the ISO 10791-6 standard, Annex A to C [8]. The purpose of this study is to investigate the error factors that influence the accuracy of the machined S-shape and surface quality, and to establish that the proposed S-shaped machining test cannot exclusively evaluate the accuracy of five-axis machine tools. To achieve this purpose, actual machining tests and corresponding simulations have been performed using two NC programs with different tolerance values. The influence of geometric errors concerning rotary axes was investigated through simulations
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
