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1、 密 级分类号编 号成 绩本科生毕业设计 (论文)外 文 翻 译原 文 标 题CNC DRILLING MACHINE CONTROL SYSTEM DESIGN译 文 标 题数控钻床控制系统设计作者所在系别电子工程系作者所在专业自动化作者所在班级作 者 姓 名作 者 学 号指导教师姓名指导教师职称完 成 时 间2011年12月07日北华航天工业学院教务处制译文标题伺服系统的设计3-Axis数控钻床基于xPC目标原文标题Design of Servo System for 3-Axis CNC Drilling Machine Based on xPC Target作 者Butler Jero
2、me译 名杰罗姆巴特勒等国 籍美国原文出处Atomation Professional English CauseAbstract As special equipments, the CNC drilling machines require servo systems specially designed. So there is a substantial waste of time and energy. In order to solve this problem, a design proposal for the servo system of 3-axis CNC drilli
3、ng machine based on xPC Target is presented in this paper. Taking a CNC drilling machine model as the experiment platform, the block diagram of the servo system was designed using SIMULNK tools, and compiled into a real time system by VC complier, which could run on X86 computer. Rapid developing of
4、 a servo system for 3-axis CNC drilling machine is easily implemented by this proposal. The experimental results demonstrate that the feed system of the drilling machine model could carry out a quick precisionpositioning. Key words-servo systems; drilling machines; xPC Target;I. INTRODUCTIONThe CNC
5、drilling machine is mainly for drilling holes with numerical control. The most products are special Figure 1. The control system structure of 3-axis CNC drilling machineequipments, which are widely used in hole processing technology for the PCB and large porous tube sheet parts.1 And, these products
6、 most are special equipments, can be classified as CNC vertical drill, drilling center, CNC PCB drill, CNC deep-hole drill and other large CNC drilling machine.2 It is applicable to machining the parts with lots of precise holes in procedures of drilling, spreading, weaning and threading. Especially
7、, its important to improve the machining accuracy and efficiency that choose a special CNC drilling machine to work the PCB and large porous tube sheet. While, the design of servo system is the most complex in the process of designing a special CNC drilling, and require plenty of time to program and
8、 debug. So, it not only consumes the valuable intellectual resources, but constrains to market the product timely. XPC Target is a tool set based on Matlab/SIMULINK that is provided by MathsWorks. It has a wealth of I/O device modules which support the majority of integrated circuit boards.3 And, xP
9、C Target introduced a host-target technical means, one PC as host computer, and another industrial computer as target computer, two computers connected with network cards and communicate through TCP/IP protocol. The systems by xPC Target can run onX86 computer real-time. It achieves simulation on bo
10、ard and rapid prototyping of control systems. The CNC technology lab for scientific research in Guangdong province developed a 3-axis CNC drilling machine model which is based on the product manufactured by Shenzhen Open Technology Corporation. Using the drilling machine model as test platform, desi
11、gned the special servo system based on XPC Target. II. SERVO CONTROL SYSTEM STRUCTURE OF THE 3-AXIS CNC DRILLING MACHINE The control system of the 3-axis CNC drilling machineis a two-level computer control structure: the host computeris a personal computer, and carries out drawings,commands, communi
12、cations etc. the lower computer is anembedded computer of PC/104, as the core unit of servocontrol system in the drilling machine.The host computer communicates the data of commands and motion states with the embedded computer of PC/104 by RS232, As shown in Fig.1. And, apply the Modbus communicatio
13、n protocol to keep the data mutually transmitted exactly. In this system, ADT652 expansion card according with PC/104 bus is used as the I/O interface of the system. Using the software of SIMULINK, designed servo control system of 3-axis CNC drilling machine based on XPC Target. And, the software of
14、 the system was downloaded to the PC/104 and real-time operated ascompiled and debugged successfully. After complicated computing, the PC/104 modulates the results into a corresponding PWM signal that is exported to the motor drive circuit through ADT652 board. Then, the motor driving the correspond
15、ing axis rotates at a definite speed under control. At the other side, a incremental rotational photoelectric encoder was fixed on the servo motor of the relevant feeding mechanism to obtain its position，which is fed back to the PC/104 by the I/O port of ADT652. While, the motional speed of the spin
16、dle servo motor is obtained by speed senor, and is fed back to the PC/104 by the ADC channel of ADT652.III. ESTABLISH THE SERVO CONTROL SYSTEMIn general, the servo control of CNC drilling machines feeding mechanism is point-to-point control. And, thefeeding rate of X, Y-axis could obviously affects promoting the production efficiency, but the
