| Summary: | 碩士 === 國立勤益科技大學 === 機械工程系 === 106 === Recently the rapid increase in need for high speed, high precision, and high efficiency machining has prompted the development and application of the multiple-axis machine tool. This also drives the domestic spindle fabrication to develop and produce the rotary spindle tooling module for supporting the manufacturer of machine tool. In practice, the machining performance is determined by the dynamic characteristics of the spindle modulus, which are further determined by the structural characteristics of the rotary spindle head and the kinematic precisions of the spindle module during the machining operation. Furthermore, the dynamic frequency response of the spindle tool subject to the cutting force actually affects the machining stability. Therefore, understanding the dynamic behavior of the spindle tooling system and the affecting factors is a perquisite in developing the rotary spindle head module for multiple-axis machine tool system.
In order to evaluate the feasibility of the application of the swivel spindle head module on the milling machine, this study developed a five axis gantry milling machine with the rotary milling head. The dynamic and machining performance of the spindle module under different motion posture were assessed, serving as an improvement of swivel milling head. According to the analysis, the milling spindle was shown to have a consistent dynamic performance in high frequency range, but also show a variation in low frequency response functions, varying with the changing of rotation angle. The machining stability analysis show that the spindle tool has a limited cutting depth of 11 mm at high speed machining around 10000 rpm, valid for high speed and high precision machining; while the limited cutting depth ranged from 60 mm to 105 mm when operated at low speed about 300 to 1000 rpm, which is suitable for heavy and rough machining. This result fully illustrates the feasibility of the rotary milling head in application of the multiaxis milling machine with desired machining performance.
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