船舶板材激光除锈工艺参数确定方法研究

Determining Process Parameters for Laser Derusting of Ship Steel Plates

针对绿色造船技术发展对船用钢板表面清理除锈的工艺需求,研究基于光纤激光器的船舶板材激光除锈工艺。通过激光单线扫描除锈实验,得到沟槽轮廓几何特征量随激光能量密度的变化关系：在0.5~5 J/mm2能量密度范围内,单线扫描沟槽轮廓的深度、宽度、横截面积三个几何特征量均与能量密度近似呈线性关系。针对船舶板材表面除锈工艺要求,提出一种通过单线扫描沟槽轮廓特征来确定搭接扫描除锈工艺参数的方法。搭接扫描除锈实验结果表明该工艺参数确定方法在一定范围内有效可行,激光除锈能够达到船板涂装清洁度标准,并能满足表面粗糙度的要求,为激光除锈在船舶板材表面清洗中的应用提供了有效的工艺参数确定方法。

Aiming at the requirements of ship steel plate cleaning for green shipbuilding, laser derusting with an optical fiber laser is investigated to obtain the proper process parameters to satisfy the surface quality of derusting.The relationships between groove geometry characteristics and the laser energy density are explored through the single-line laser scanning experiments. The results show that the groove depth, groove width and cross-sectional area of single- line scanning grooves are approximately linearly related to the laser energy density under the condition that the laser energy density comes within the range of 0.5~5 J/mm2. According to the requirements of ship steel plate derusting, a method to determine the process parameters for laser derusting via single line scanning groove geometry characteristics is proposed. Experiments of overlapping scanning laser derusting show that the proposed method is effective in a certain range so that laser derusting can reach cleanliness standards of ship coatings, and can obtain the specified different surface roughnesses. The results demonstrate that laser derusting with a pulsed fibre laser can satisfy the requirements of surface cleaning for ship steel plates.