Abstract
With the development of the aerospace industry, the hybrid machine tool for machining the complicated curved surface is becoming a research hotspot. The S-shaped test specimen proposed by Chengdu Aircraft Industrial Company is an effective test method to verify the ability of machining the complicated curved surface for a machine tool. Considering the spatial parallel kinematic manipulator in a hybrid machine tool provides the complicated orientation motion and its design of structure dimension affects the accuracy of the machine tool, this paper investigates the issue about dimension synthesis of the manipulator based on S-shaped test specimen. By establishing models of the S-shaped test specimen and parallel kinematic manipulator, the motion trajectory of the parallel kinematic manipulator for machining S-shaped test specimen is obtained. According to the motion trajectory and expected performance indices, the result of dimension synthesis for the manipulator is plotted and a set of suitable dimensions is achieved. With the analysis result in this paper, it is helpful to improving the accuracy of machining the S-shaped test specimen.
Highlights
With the rapid development of the aerospace industry, a 5-axis machine tool with high accuracy, high speed and high orientational capability is becoming a research hotspot [1,2,3,4], which leads to two important issues: how to detect the machining performance of a 5-axis machine tool and which kind of machine tool is suitable.For the first issue, many investigations have been addressed on it
Considering the special machining demand of the aerospace industry, such as the S-shaped test specimen covering a mass of complicated machining poses, and in order to improve the machining accuracy of this kind of 5-axis hybrid machine tool which is used for the aerospace industry, it is necessary to study the relation between the 3PRS parallel kinematic manipulator and the S-shaped test specimen and deal with the dimension synthesis of the 3PRS parallel kinematic manipulator based on S-shaped test specimen
In order to improve the machining accuracy of this kind of 5-axis hybrid machine tool which is used for the aerospace industry, the workspace, position and orientation error sensitivity based on the machining trajectory of S-shaped test specimen are taken as the performance indices of concern to investigate
Summary
With the rapid development of the aerospace industry, a 5-axis machine tool with high accuracy, high speed and high orientational capability is becoming a research hotspot [1,2,3,4], which leads to two important issues: how to detect the machining performance of a 5-axis machine tool and which kind of machine tool is suitable. The most used one may be the ISO international standard test specimen, which usually is adopted to detect the translational axis accuracy of a 3-axis machine tool This one cannot reflect the motion accuracy of multiple axes. Anther accuracy detection test specimen used a lot in practice is the NAS979 proposed by NASA in 1969 This one is used widely in 5-axis machine tools for detecting the motion accuracy of multiple axes. Considering the special machining demand of the aerospace industry, such as the S-shaped test specimen covering a mass of complicated machining poses, and in order to improve the machining accuracy of this kind of 5-axis hybrid machine tool which is used for the aerospace industry, it is necessary to study the relation between the 3PRS parallel kinematic manipulator and the S-shaped test specimen and deal with the dimension synthesis of the 3PRS parallel kinematic manipulator based on S-shaped test specimen. In order to achieve this goal, the most widely used method in the field of parallel kinematic manipulators, namely Performance-Chart based Design Methodology (PCbDM), is employed to investigate the dimension synthesis problem [10,11]
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
