System Design Of The Three Coordinate Machine

With the development of science technology and advanced manufacturing technology, people put forward higher requirement of Numerical Control (NC) Machine Technology. With the application of superhigh speed cutting and ultra precision machining technology, people put forward higher performance index of numerical control system, servo performance. Spindle Driver and machine tool.Compared with ordinary milling machine, to meet the NC Milling Machine’s requirements of high speed, high precision, high productivity, high reliability and high automation, NC Milling Machine should have better static stiffness, dynamic stiffness and anti-vibration. Combined with engineering experience and theory, the thesis deeply studies the design and realization of the three coordinate machine system. The main contents include the following aspects:1) The three-dimensional finite element model of bed structure of the NC machine tool is established and the characteristics of static stiffness. And the deformation structure of the static stiffness and key areas is given. Meanwhile, it get the first ten natural frequencies and mode shapes and given the proposals and theoretical basis for the future design.2) Combined with the practical engineering experience, the main shaft and the bearings supporting the NC machine tool is designed and applied to the analysis and check of the strength and stiffness. On this basis, the heating amount of the spindle was calculated and got the size of cooling oil-hole. Finally the reliability performance of the main shaft is analyzed.3) The composition Siemens 840D system of NC machine tool is introduced, and it includes the NCU digital control part, MMC man-machine communication module and PLC module. Combined with the practical engineering experience, the design of hardware and software system is given. Finally the common fault analysis of the Siemens 840D system is provided.