Study On Spindle Servo Control Of Four-axis Vertical Machining Center

Machining center is a type of computer numerical control machine tools equipped with tool magazine. It cuts work pieces while the tool magazine automatically detects and uses the proper type of cutting tool in different stages of the manufacturing process according to pre-determined configurations. At present, machining center belongs to the more technically advanced group of mechanical processing equipment in machinery industry. The degree of development of machining center is an important benchmark that reflects a country's technical and manufacturing advancement of machinery industry. As a result, competing companies in machinery industry worldwide are constantly looking for ways to improve technique used in machining center. Though machining center has been widely adopted in companies in machinery industry in China, further studies in technologies associated with multi-axis machining center spindle structure and servo system control are still required. Compared to its three-axis counterpart, four-axis machining centre performs stronger with a wider range of application. Given the reasons stated above, this article studies findings in four-axis vertical machining center spindle structural design and the control of its servo system.The proposed four-axis machining centre works as the vertical spindle swings, causing the spindle to swing in sync. The thesis starts with a brief introduction of the design of spindle and a list the configurations of servo motor. Providing this background information will help the readers in understanding mathematical modeling controled by servo system. Swing motor of B-axis is permanent magnet synchronous servo motor. The article then goes on to describe the pros and cons of the different types of machining center by comparing the functions of those spindle components. The result of this analysis is a proposal of a combination of spindle components with optimal functionality. With this proposal, the article proceeds to complete the mathematical modeling for B-axis and the servo system of spindle with an analysis on the effects of proposed configurations used in servo system.Research in this article provides a reliable method for B-axis design, the modle of drive system, and the reference for researching and selecting servo system in the future.