Research And Design Of Gravure Plate-making Engraving Machine Control System Based On FPGA

The gravure printing process, in which the printing was done with a plate bearing an image lower than the printing plate, called intaglio printing. Together with offset printing, relief printing and flexible printing, they are considered as four most important printing processes. Intaglio printing has many merits, such as being suitable to many materials, broad printing width, high quality of the printing, vivid color, and high rapid of the printing process, which means a broad market prospect. Nowadays, many of the gravure engraving machines available on the market are produced abroad, which possess the attributes of high control precision and automatic degree, as a consequence, they have a high price. Therefore, in order to promote the development of our packaging, developing the control system of carving machine, which has high performance cost ratio, would have a very important realistic significance. In this study, we develop a control system of gravure engraving machine based on embedded numerical control method. The major works are presented as follows:In the study, the motional principle of gravure engraving machine using CTP Technology was studied. The process of the intaglio printing was also analyzed. Based on the major material of copper plate, we studied the carving frequency, roll velocity and the longitudinal velocity, which would place influence on the lines and cell's angle, three-axis transmission association model was established to engrave cells of diamond shape with any cell angle.The relationship between DC component and AC component of the input of carving head which influences the work current of engrave printing gravure cylinders head was studied. Based on the study of cell's generative process, the relation model of the cell's shape and amplitude of alternating current was established. Accordingly, the model of the depth and the shape of cell was established。In order to maintain the precision of engraving process, stability and the quality of the cells, a multi-axes motion control system based on Field Programmable Gate Array (FPGA) was proposed. And aiming at the performance requirements of three-axis velocity, an optimized velocity control strategies was proposed and a flexible accelerate-and-decelerate curvature model which is compatible of the three kinds of velocities was also established. And these algorithms are carried out by a programming language of VerilogHDL.To satisfy the requirements of large-scale image data transmission, a multi-axes motion control system based on PCI bus was proposed and the simplified PCI functions were realized in Altera's Cyclone chips. Based on exploitation platform of Driver Studio, a WDM driver program of PCI equipment was designed and thus the high-speed communication between the PC and control card was achieved.At last, this design was used in the 8 KHz high speed gravure engraving machine. The testing and debugging of the machine was done including multi-axes motion controlling, the engraving data transmission, current driving of engrave head. The image engraving was tested. The design was verified by the correct engraving consequence and the error analysis of testing data.