Research Of Digital Controlled 3D Laser Processing System

Traditional 3D laser processing technology usually uses mechanism guide rail to produce 3D scanning, and it has advantage over the range of processing. But it costs time and is also complicated. As miniaturization is the development trend of equipments, mechanism guide rail can't meet the needs of production process . To solve this problem, we designed a digital controlled laser 3D processing system which involves optics, mechanics, electronics and computer science. This is a new kind of 3D laser processing technology. The system process the surface of the material by moving the beams of laser based on the design of the 3D figures by control of computer. 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 3D laser system base on the analysis of the laser processing physics theory.The paper begins with traditional 3D laser processing technology, introduces the status quo of current 3D laser processing technology and its shortage,then followed by the concept of laser process, compares common laser scanning methods, chooses the most compatible laser and optical circuit. After studying the process of laser and substance working on each other,the theory of high speed galvanometer scanning system, the dynamic focus system, the laser power digital controlled circuit and how to control the laser moving by PCI bus and DSP are expounded.The paper raises the point of 3D graph padding arithmetic which has been implemented in the 3D laser controlling software developed by ourselves. The 3D movement of laser beam is under the control of this software. 3D dynamic display of the 3D graph of processing workpiece has been realized in this software based on OpenGL API functions, which makes easier for observing and positioning of the workpiece.We make some improvement during the use of digital controlled 3D laser system. For example, the safety glass separates the processing area from the operating area, which improves the laser equipment's safety; the dusting machine clean up dust to protect lens that comes from the work piece while processing; the power will go down while opening the cover of laser equipment to protect operator and system; the rotary worktable realizes processing one work piece while mounting another, thus improves the efficiency of system at least by 50%.At last we validate the system stability and precision by a series of experiments. 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.