Research On Development Of CAM System Based On Open CASCADE For MID Laser Direct Structuring

3D-MID (Three Dimensional-Molded Interconnect Devices) is an innovative technology in the field of mechatronics. It abandons the conventional circuit boards and integrates the mechanical and electronic functions directly on injection molded thermoplastics. Laser direct structuring is the most advanced technology and mature in MID manufacture, but there are many limitations in applications, there are still some flaws in LDS equipment and the development of CAM system for LDS simulation is lacking, more reseach is needed.In this paper, the research status and existing defects of MID laser direct structuring (LDS) equipment and CAM system have been analysed, then the CAM system of MID laser direct structuring has been developed based on Open CASCADE, and the main research contents of the paper are as follows:(1) The CAM system framework of MID laser direct structuring is designed, and the CAM system of LDS has been developed in the paper which is based on Open CASCADE and MFC. In the system, the functions of entity selection operation, basic geometry modeling, boolen operation and data exchange have been realized.(2) The integrated design idea is determined for MID laser direct structuring (LDS) equipment, and the modular design method is used for the overall structure design of MID LDS equipment. The overall structure design of MID LDS equipments which is combined with the advantages and disadvantages of the existing laser processing equipment and five-axis NC machine tools. Combine the galvanometric scanning system and5-axis workbench to achieve five-axis laser procesing, in order to meet the MID LDS technology requirements. Finally, consider the perspective of efficiency, long machine structure of laser direct structuring is researched. (3) For the needs of modular design and subsequent simulation, the virtual modeling method of MID laser direct structuring (LDS) equipment is proposed, and the virtual model and kinematics model of LDS equipment is establish. In terms of refinement of LDS equipment model, in order to refine the model in CAM system, an interface with simulation system and SolidWorks is developed based on that the key compents and assembly equipment of laser direct structuring are complete by SolidWorks.(4) The kinematics analysis of MID LDS equipment have been carried out in this paper, which including the kinematics analysis of5-aixs workbench and kinematics analysis of galvanometric scanning system. According to the results of kinematic analysis, the description of the five-axis structure and galvanometer scanning system how to work in the three-dimensional circuits LDS process is made, which lay a foundation for the development of simulation module.(5) In this paper, the modules of drawing the circuit in three-dimensional matrix and the simulation of laser direct structuring process and NC code output are developed. In the three-dimensional circuit drawing module, complete the interactive features to establishment circuit, which uses the rubber band technique to achieve the function of dynamic mapping the circuit, In the LDS simulation module, the circuits’ path generation of three-dimensional laser machining process is achieved, and the algorithm of path planning, by the simulation examples of LDS machining process, the correctness and rationality of circuit processing path generation and path planning algorithm are verified. In the NC code output module, combine with the results of path planning and processing of simulation, the NC machining code is automatically generated, which lay a foundation for the actual processing of subsequent MID Laser Direct Structuring equipment.