激光毛化加工新型调制斩光系统的设计

为了提高CO2激光毛化轧辊的质量，根据激光束扩束聚焦的特点，设计了一种新型激光束调制斩光系统。采用机械式调制斩光盘使激光束交替透射与反射到加工表面，达到先预热后毛化或双点毛化的效果。讨论了激光束的调制聚焦光学参数的选择方法，并结合实例进行了讨论。结果表明，通过对光腰位置以及散焦程度进行调节，可以获得合理的焦斑大小与能量密度。使用该光束调制装置加工的毛化轧辊表面具有各向同性和均匀一致的粗糙度，以及较高的耐磨性。

Design of New Laser Beam Modulating Device for Texturing Machining

Aim at increasing the quality of textured roller by CO2 laser processing, a new laser beam chopping and modulating device was designed based on the beam expanding and focussing transformation characteristic. The laser radiation was transmitted and reflected to the machining surface alternately using a mechanical chopper, which resulted in efficient preheating or double points texturing effect. The selection of optical parameters for the laser beam modulating was investigated. An example application was discussed. Reasonable focal spot and energy density were gained by adjusting the position of the local beam waist and the off-focus degree. The laser textured roll had uniform roughness and high surface hardness, and the hardened bumps improved the abrasion resistant quality.