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Research of Digital Controlled Laser Die-Cutting System

Author: WangMeng
Tutor: LiuTieGen；ZhangGuoShun
School: Tianjin University
Course: Optical Engineering
Keywords: laser processing die-cutting galvanometer scanning system flying optical circuit optimized path arithmetic
CLC: TN249
Type: Master's thesis
Year: 2007
Downloads: 126
Quote: 0
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Abstract

Traditional mechanical die-cutting technology usually uses wood die to produce paper packing by mechanical pressing. It costs time and is also complicated. A finished die is very difficult to be modified,particularly to produce a small quantity or different shapes. To solve this problem, we designed a digital controlled laser processing system which involves optics, mechanics, electronics and computer science. The system process the surface of the material by laser based on the design of the packing by control of computer and die-cut packing by moving the beams of laser. Also, it can crease, perforate, mark and encrypt on the pack surface by controlling the laser power and speed.The purpose of this paper is to research the processing of digital controlled laser on paper packing system base on the analysis of the laser die-cutting physics theory. The paper begins from traditional die-cutting technology, introduces the status quo of current die-cutting technology and its shortage,then followed with the concept of laser process, compares common laser processing methods, chooses the most compatible laser and optical circuit. After studying the principle of laser die-cutting technology, the process of laser and substance working on each other,the theory of high speed galvanometer scanning system, the fly optical circuit principle, the laser power digital controlled circuit and how to control the laser moving and power by PCI bus and DSP are expounded. We designed the galvanometer scanning system and fly optical circuit for different packing size.Galvanometer scanning system is improved from analog control to digital control, makes higher precision, reduces signal disturbance during transportation. And we increases air flow equipment which gives optical lens good protection. Through updating the software control system, the galvanometer scanning system becomes faster and more convenient. Fly optical circuit system is a new way of laser die-cutting. It processes packing size as tens time of galvanometer scanning system. When the server control system drives two dimension precision laser head, it checks the difference between the factual position and set position and corrects.The paper also raises the point of new optimized path arithmetic. That is to find out the best resolution through the analysis of constructed mathematical model, and to design software to analyze die-cutting paper. After connecting the individual line segments into a combination, finding out the shortest processing distance, we can shorten the time cost of process and reduce kerfs, improve quality.At last we validate the system stability and precision by experiment. The result is accord with the design. Some suitable processing parameters, something that can be improved, some technology problems to be solved are all mentioned here.

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