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Structural parameters Spindle outer diameter 0l28.57mnu Tool maximum diameter 0125nmi Power parameter Small motor power 1; According to the motion function structure and layout rules, determine the basic size and assembly relationship of each functional module of the horizontal machining center, and use the software to generate the overall layout of 4.
1 Zhang Guangpeng. Huang Yumei and so on. A creative approach to the design of machine tool motion functions. Combined machine tools and automated processing technology 199922 Feng Xinan, Huang Yumei. Mechanical manufacturing equipment design. Beijing Machinery Industry Press, the third peak, Xi'an University of Technology School of Instrumentation, zip code editor Zhao Honglin received revised date 200,521 parameters Jiangsu Province nine major industrial research project 980062.
There is a large window on the front wall of the bed, the internal ribs are horizontal and horizontal, and there are a number of reinforcing small ribs, the bottom is closed, and the outer wall of the bed is 18 slab thick.
3 The finite element chess type 13 first-order vibration type bed adopts a single body. Modeling 13. The order vibration frequency is 289.5, which is a torsional vibration with a large relative displacement.
This reflects that the original bed is prone to large torsional vibration under the excitation of the grinding force, which causes the grinding surface to produce vibration marks, resulting in a decrease in grinding precision.
The main reason for the lack of torsional rigidity is that the internal ribs of the bed are unreasonably arranged. The front of the bed has a large window and the longitudinal and transverse ribs are broken. In view of the above analysis, under the premise of considering the size of the outer shape of the bed, the structure and layout of the internal ribs of the bed are modified accordingly, and an improved scheme is proposed. Muwen will analyze the number and layout of the internal ribs of the bed. Dependent, 2.2, improved model The size of the bed is basically determined due to the basic function of the bed, so the internal rib cloth 4 is a better point to adjust the dynamic characteristics of the bed.
The bottom of the improved bed adopts a non-enclosed structure, the wall thickness of the night wall is 16, and the inner ribs are 12. The static rails of the working bed rails are relatively rigid, the horizontal vertical ribs of the inner support rails of the modified bed are unchanged, and the spacing of the flat rails is unchanged. Unchanged, the ribbed layout in the other two directions has a horizontal rib and a vertical vertical rib inside.
The improved type 3 bed has a horizontal rib and a longitudinal rib.
The improved bed has a horizontal rib and a vertical vertical rib.
The difference between the horizontal ribs and the longitudinal vertical ribs in the improved type 3 bed is different from that of the modified type 1 in that the positions of the horizontal ribs are different.
3 Dynamic analysis and results For high-precision grinding machines, the dynamic characteristics of the machine structure are the key factors affecting the performance of the machine. Considering the working frequency band of the machine tool, the first few modal characteristics of the bed play an important role. The most typical is to consider the first-order modal frequency and its corresponding mode shape.
The vibration characteristics of the bed are compared with the vibration mode of the vibrating guide. The relative displacement of the original mode. The original bed is torsion improved. The type 1 torsion is improved. The type 1 torsion is improved. The 0 type torsion is improved. The type 4 torsion is the flat guide rail of the machine bed under the same naturalization standard. The relative vibration displacement is applied to the modal analysis of the bed limit element model, and the results are as attached. It can be seen that the natural frequency of the improved type of torsional vibration mode is much higher than that of the original bed. According to the natural frequency of 1 in the form of moxibustion 2, moxibustion 1 is the corresponding modal stiffness and quality. The torsional rigidity of the improved bed has been significantly improved, and the design of the bed has been improved.
However, the horizontal ribs of the bed can significantly improve the torsional rigidity of the bed. Improvement; type 1 has horizontal ribs and vertical vertical ribs. It has two horizontal ribs and vertical vertical ribs. The dynamic stiffness is very high, but the relative displacement of the vibration mode of the guide rail is very large. . The dynamic stiffness of the improved type 4 is less than the improvement. Type, but the guide rail vibration mode relative displacement is small. This shows that the dynamic characteristics of the bed dominated by the slab structure are affected by the vibration modes of the plates, and the dynamic stiffness cannot be used as the evaluation index.
The improved type 1 is more improved than the type; the multi-longitudinal vertical ribs, but the torsional stiffness is reduced. Improved and improved type 1 only. The position of the horizontal ribs is different, but the dynamic characteristics are quite different.
Therefore, the one-sided, stiffened plate does not necessarily improve the movement of the bed. It is the structure of the exchange body; as a result of the cooperation, because the relative displacement of the vibration mode of the bed rail is the main factor affecting the machining accuracy of the grinding machine, the design of the relative displacement of the vibration mode of the bed rail is designed. The main basis of the reference, taking into account the machine tool dynamic stiffness and vibration mode and other characteristics. Through the above analysis and comparison, the modified guide rail vibration mode has the smallest relative displacement and the guide rail has high dynamic rigidity. Therefore, after comprehensive comparison, you should choose to improve the type 1 meal, 1 Tang Wencheng and so on. The design of the bed structure of the machining center. Mechanical strength, 1998, 2012 Yi Hong and so on. Topology optimization design of large machine structure. Journal of Southeast University, 1996 3 Xu Yanshen editor. Mechanical dynamic design. Beijing Mechanical Industry Press, 199, 5, author Chen Xin, Nanjing City, No. 2, Ph.D., Department of Mechanical Engineering, Southeast University, Zip Code 210096, edited by Zhao Honglin, revised date, 200100519
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