The X5325c The Cnc Transformation

Based on the aspects of the improvement on X5325C milling machine as follows:the economy, convenience, function and reliability. This dissertation conducts thesystematic design, hardware circuit design and software design. These workimprove the functions of milling machine on some aspects as follows: the large staticand dynamic stiffness of the mechanical drive parts, the little friction factor of themotion pairs, no clearance in driving, the large power and the convenient operationand maintenance. The improved milling machine have some special functions asfollows: the program store and compile, the backward and forward rotate of maindrive system, the two grades rotating speed which has continuous speed variationwithin each grade, the operation in variable or constant speed according to the settingcurve in the area of plane and space, the random setting value and display data, thefree start-stop and the failure alarm and the communication with the master computer.The system designs of X5325C numerical machine's mechanical include thedesign and the calculation of the servo drive system, of the lead screw nut pair,parameters calculation of the main drive system, and its structure design.In the design of the feed motion's drive system, it should be removed that all thelongitudinal and the traverse and the vertical feed change gears. Joint the handle wheel axel withthe vertical stepping motor through a pair of reduction gear there, the ball screw is used instead ofthe leads crew, which is connected with the gearbox.. Accuracy of position of the improvedX5325C milling machine is±0.01mm, its precision of repeatability is±0.005mm. The motorsfor X and Y directions are able to draw the working table to have cutting and feeding motion inX and Y directions in the speed of 6-3200r/min. The main axle box is enabled to acquire a feedspeed of 3-1600r/min given by motor for Z direction. During the design of the main drive system,the machine's main axle is removed and redesigned. In order to ensure the main axle's accuracyof position in the motion, The main drive's localization checking device should be installed. Inthis way, making use of the electrical main axle's stop device, and the magnetic sensor will checklocalization. The main axle's accurate localization is to be realized, As soon as the numericalcontrol system sends the instruction signals. The frequency conversion and alternating current motor is substituted with stepless speed regulation to the main drive. Rotation speed of lowergrade is 100-800r/min and higher grade 500-4000r/min. Stepless speed regulation can be realizedwithin all the grades. Compared to the mechanical structure of the original upright millingmachine, it is simpleness, because the function of speed conversion is taken mainly or all by mainaxle motor's stepless speed regulation, which skips the complicated gear wheel's speedconversion structure. The main drive system is a system of alternating current and frequencyconversion controlled by open loop, whose speed regulation is done by software.The numerical system is a data control system designed by model block based on singlechip microcomputer. The single chip microcomputer of smaller volume is adopted to realize thecomplicated logical function, Making full use of the interrupt and the second functional entranceto make the usage of the entrance to the highest degree and the whole structure easier. As a whole,the system can be divided into man-machine interface model block, the serial communicationmodel block, the hydraulic system, the cooling system, the lubrication system and the maincontrol model block based on the 89C58 single chip microcomputer. Overcoming the traditionaleconomy numerical control system's shortcoming, it has a programmed flexibility and a higherfree-degree. By programming, various complicated logical control is realized. And byinterpolation algorithm.It makes stepper motor realize accurate location in order to achieve thework precision; Through the keyboard and the display model, it has realized the procedureedition and the display; Though other subsidiary system's design, it has realized the machinefunction's consummation.