Modeling the Static and Dynamic Behaviors of a Large Heavy-Duty Lathe Machine under Rated Loads

被引:3
|
作者
Lin, Chien-Yu [1 ,2 ]
Luh, Yuan-Ping [2 ]
Lin, Wei-Zhu [3 ]
Lin, Bo-Chen [1 ]
Hung, Jui-Pin [4 ]
机构
[1] L&L Machinery Ind Co Ltd, Dept Res & Dev, Taichung 41154, Taiwan
[2] Natl Taipei Univ Technol, Grad Inst Mfg Technol, Taipei 10608, Taiwan
[3] Natl Chin Yi Univ Technol, Dept Mech Engn, Taichung 41170, Taiwan
[4] Natl Chin Yi Univ Technol, Grad Inst Precis Mfg, Taichung 41170, Taiwan
关键词
dynamic rigidity; frequency response function; large heavy-duty lathe; five-axis turning-milling machine; FINITE-ELEMENT-METHOD; MATERIAL REMOVAL RATE; DEFORMATION; STABILITY; SHAFT;
D O I
10.3390/computation10120207
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
The static and dynamic performances of a machine tool structure are considered to constitute the primary factors affecting the load-carrying capacity, geometric accuracy and surface precision of the workpiece. The machining performance of a large machine tool under stable conditions is effectively determined by its dynamic response to the cutting force at low-frequency excitation. This study, therefore, investigated the static and dynamic characteristics of a large heavy-duty lathe machine tool in which the headstock and tailstock comprised critical component modules supporting a large workpiece during low-speed machining. Using a finite element model, the influences of the structural modules on the static and dynamic characteristics of the lathe were analyzed, considering the effects of the workpiece load. The results indicated that the fundamental vibration modes of the lathe were primarily dominated by headstock, tailstock, and workpiece behaviors. The maximum compliances of the lathe under the rated load were found to occur at relatively low frequencies (22, 40.7, and 82.7 Hz) and increase with the reduction in workpiece weight. Notably, these modal frequencies were significantly higher than the maximum rotational speed of the spindle (450 rpm). In addition, the dynamic rigidity corresponding to the rated speed was higher than that induced at the natural frequency. These results indicate that the subject lathe possesses sufficient capacity to sustain the cutting load during stable turning machining. This study can, therefore, help designers improve the performance of machine tools for future fabrication.
引用
收藏
页数:18
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