| Numerical control technology is an advanced manufacturing technology and is the kernel technology of CNC equipment. Nowadays, the advanced NC technology is widely adopted by the manufacturing of all countries in the world in order to improve the manufacturing capability, the adaptive ability and the competition power facing complicated and volatile market. NC technology and NC equipments have been regarded as national strategic materials in the developed countries. The developed countries not only take significant measures to develop their NC technology and NC industries but also adopt the blockade and restriction policies in "advanced" NC equipment and key technology against our country. Therefore, with the high-speed development and popularization of computer technology, in the time of modern manufacturing system developing toward the intelligence, integration and network integration, developing vigorously independent CNC technology has important practical value and strategic significance for breaking through the technical blockade and studying new generation of numerical control in depth.The paper aims at HTM61350 horizontal turning and milling center to do the analysis and study, and establishes the three-dimensional structure of the turning and milling center by using Pro - E. Using ANSYS Workbench carries out static stiffness analysis and modal analysis aiming at the turning operation and milling operation of the machining center .This paper determines relative deformation of each main part of the turning and milling center through the finite element analysis, and figures out the percentage of the deformation of the each main parts in the total deformation of the machining center.The paper studies the overall deformation of the machine in the four different working loads. The result of the finite element analysis indicates that the C-axis bearing is the main deformation part and its deformation is 57% of total deformation of the machine. Another, the paper studies the deformation of the each part of the machine in the case of the same working load when the machine execute turning and milling in the X, Y Z-direction and The paper draws a conclusion that the main deformation part is the cross guideway and its deformation is 18% of total deformation of the machine. At the same time, the paper carries out the modal analysis aiming at the turning and milling of HTM61350 horizontal turning and milling center. For the turning of the machine, the paper studies the structural deformation of the machine in the case that the spindle speed is the same and the natural frequency is 41.225HZ, 69.625HZ, 55.114HZ and 57.859HZ respectively; For the milling of the machine, the paper studies the structural deformation of the machine in the case that the spindle speed is 4000r/min and the natural frequency is 23.181 HZ,40.142 HZ,41.766 HZ,54.392 HZ,56.033 HZ,61.713 HZ,63.044 HZ,65.297HZ, 74.917HZ, 79.105HZ respectively.In the case that the spindle speeds is certain, the research results show that the deformation of the machine becomes obvious, as the natural frequencies increase gradually. When the natural frequency the machine is the lower (less than or equal to 23.181 HZ), the deformation occurs mainly in the workpiece, headstock and tailstock, and little deformation in the milling columns; When natural frequency speed is between 40.142HZ and 23.181HZ, the deformation occurs mainly in the milling columns; As the natural frequency increases, the main deformation reoccurs in the work-piece, headstock and tailstock; When the natural frequency is more than 61.713HZ, the main deformation the machine occurs mainly in the milling columns, and as the natural frequency increases, the deformation of the columns rapidly worsens; When h the natural frequency is more than 79.105HZ, the machine will completely lose working ability.This paper carries out static stiffness analysis and modal analysis for overall machine and thermal analysis for headstock aiming at HTM61350 hydraulic turning and milling center, and determines main deformation parts and relative deformation information in the case of the machine running, the above information provide can reliable theory for improving the machine and can also act as reference data for designing new machine.
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