【摘要】 针对激光快速成型预热工艺粉层温度检测与控制的难题,提出一种基于图像分析的快速成型预热优化方法。该方法使用VB编程及二次开发技术,利用Windows的应用程序编程接口函数,对粉层图像进行在线分析处理,析出图像的灰度直方图及预热效果指标。将当前粉层的预热效果指标与标准值进行比较,基于比较结果对预热工艺参数进行实时反馈控制。根据移动热源和固定热源给出了两种不同预热方式下的实现算法。该方法在软/硬件实现方面采用模块化设计,可嵌入已有的快速成型设备及控制程序中。实例分析结果表明,使用该方法进行预热优化控制,可提高成型件的曲面完整度及机械强度,提高成型效率,减少失败次数。更多还原

【Abstract】 To against the demerits of temperature measurement and control for powder bed in preheating process,this paper presented an optimization method of preheating process in rapid prototyping(RP) based on image analysis.By utilizing Windows application programming interface(API) functions,it analysed the image of powder bed on-line by adopting VB and secondary development technology.Grayscale histogram and preheating effect index of image were calculated out to compare with the standard index.The preheating process was real-time controlled by comparison result.It presented two realization algorithms based on mobile heat source and fixed heat source.The hardware and software implementation of this method were modular designed,and could be used in existing RP machine and control program.The result of case study shows that the accuracy and mechanical strength of products are high by using this method in RP preheating process,which can improve the processing efficiency,as well as decreased the failure times.更多还原