Abstract
The profile of globoidal indexing cam is spatial undevelopable surface. It needs special CNC machine tool to finish batch production. The machining quality of the profile of globoidal indexing cam could be affected by the movement error of each part of machine tool and the clamped positioning error of workpiece. Firstly, this paper analyses the systematic error of the special machine tool of globoidal cam, derives the error transfer matrix, establishes the mathematical model of the globoidal cam profile which including all machining system errors through multi-body system theory primarily. Secondly, this method improves the measuring speed and avoids the probe radius compensation, and evaluates the tolerance of the profile greed of globoidal cam equidistant model directly. Finally, the feasibility of the measurement method is verified by experiments, and the experimental results are analysed and processed. It lays the foundation for the design, process and measurement of globoidal cam mechanism and provides a theoretical basis and key technology for developing the online rapid detection system of the globoidal indexing cam profile.
Highlights
The globoidal cam indexing mechanism has the advantages of compact structure, high indexing precision, strong bearing capacity, good high-speed performance and so on, so it has been widely used in Automatic Tool changer (ATC) of CNC machine tools, tobacco machinery, packaging machinery
This paper researches on the influence caused by error of globoidal cam special machine tool on the error of globoidal cam profile, the machining error of special machine tool and coordinate transformation matrix is analyzed by using multi-body system theory, at the same time, the error model of the globoidal indexing cam profile is established, which lays certain foundation for the integration of design, processing and measurement to globoidal cam mechanism
The main conclusions are as follows: 1) According to the structure of globoidal cam special machine tool, establishing the machine tool error transformation matrix based on multi-body system theory, and the mathematical model of globoidal cam profile error is established according to the generating machining theory of globoidal cam
Summary
The globoidal cam indexing mechanism has the advantages of compact structure, high indexing precision, strong bearing capacity, good high-speed performance and so on, so it has been widely used in ATC of CNC machine tools, tobacco machinery, packaging machinery. Wang [5] from National Chiao Tung University analyzes the influence on output accuracy of globoidal indexing cam mechanism caused by the installation error of three moving directions and three rotating directions in space. Yin Mingfu [7] from Tianjin University of Technology researches on the influence caused by center distance error of globoidal indexing cam machine tool on cam profile error and gives the changing trend of error. The measuring speed of current CMM method is slow and complex, it cannot meet the measurement requirements of globoidal cam in production line, and it is difficult to fundamentally solve the problem of radius compensation. On the equidistant model characteristic line of globoidal cam is proposed This method can be used in the measurement of production line, and the measuring speed is fast, so the radius compensation is avoided effectively
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