Research And Software Development On Laser Lens Cutting System

Laser, one of the most important inventions of the last century and contemporary representative advanced manufacturing technique, is crowned as"universal machining tool"and"common machine means for future flexible manufacturing system". The greatest advantages of Laser cutting are its rapid speed, high precision and high efficiency compared with other cutting methods. Its characteristics also cover fine kerfs, small heat affected zone, good cutting surface quality, noiselessness in cutting, smooth kerf edge, accurate verticality of kerf edge, etc.Laser dynamic-optical-type lens cutting system introduced in this thesis is mainly applied in cutting of FPCB(Flexible Printer Circuit Board) of circuit industry and covering of its assistant material. As FPCB features high wiring density, light weight, thin thickness, good flexibility and folding capability, it boasts great market application value and is widely used in mobile telephones, notebook computers, MP3, etc. The FPBC production process is complicated; production material is liable to be distorted; different parts adopt different material, which causes different cutting times and distortion degree. Therefore, strict requirements are demanded to control method of cutting system, adaptability of material distortion and cutting precision.Traditional laser cutting machine usually adopts static-optical-type cutting method, of which machining efficiency is low and cutting quality is not good, so it's difficult to meet needs of practical production. This thesis introduces the integrated system framework of application of dynamic-optical-type ultraviolet laser cutting technology into cutting of FPCB and covering of its assistant material. Gerber file is used to procure such information as cutting route and local cutting times. Projective transformation is applied to establish projective transformation matrix of points on two random planes. The automatic location of workpieces is completed by means of camera and the projective transformation. Furthermore, this thesis introduces a seamless stitching method for grids in dynamic-optical-type laser cutting. Firstly, linear interpolation method is adopted to compensate the coefficients of two axis of lens in different areas. Then the established projective transformation is applied in trapezium and diamond distortion compensation of lens. The practical results show that cutting efficiency of dynamic-optical-type laser cutting is at least eight times as much as that of static-optical-type one. This system boasts high automatic location precision which effectively compensates the deviation caused by material distortion. With the adoption of above-mentioned compensation, cutting precision and quality of the cutting system have been promoted greatly and reached the level of latest systems abroad of the same kind.