高分辨率快速成形系统涂层厚度研究

涂层性能是影响高分辨率激光快速成形系统制作精度和制作分辨率的重要因素.为获得更薄的涂层厚度,高分辨率激光快速成形系统采用活塞式涂层系统.为提高活塞式涂层系统的涂层性能,研究了活塞式涂层系统涂层参数对涂层厚度的影响,建立了涂层厚度模型.实验研究表明:涂层厚度随添加树脂量及刮刀间隙的增加而增加,涂层厚度随刮刀速度及刮刀厚度的增加而减小.试验中还发现活塞式涂层系统的涂层厚度随制件高度增加而增大.为解决该问题,提出了通过实验方法在建立制作过程中涂层厚度关于制件高度及刮刀速度的经验模型;随着制件高度的增加,对刮刀速度进行动态优化,实现涂层厚度的均匀化.

A study on the recoating thickness of high-resolution stereo-lithography system

The recoating performance is a key factor influencing the fabricating accuracy and resolution of the stereo-lithography system.In order to obtain thinner resin layer,a piston recoating system is adopted in the high-resolution stereo-lithography system.To improve the recoating performance of the piston recoating system,the influences of the parameters of recoating system on the coating thickness are studied,and a mathematic model of resin layer thickness is established.Experimental results show that the thickness of the resin layer increases with the gap between blade and object and the resin volume added into the vat during recoating.The experimental results also indicate that the thickness of resin layer decreases with the increase of blade speed and blade thickness.A phenomenon is found that the thickness of resin layer increases with the increase of the height of the coated object in high-resolution stereo-lithography system.To solve this problem,a novel methodology is proposed.First,the experiential model describing the relationship between the thickness of recoating layer and the height of the coated object and the blade speed is established,and then based on the mathematical model,the blade speed according the object height during building process is dynamically optimized,and uniform resin layer can be obtained.