Application and Drying of Automotive Paints

汽车涂装是生产过程中非常重要的一步，质量控制严格，涉及多个工序。机器人被用来操纵油漆雾化器，这些雾化器沿着优化的路径移动，以最大限度地减少油漆使用量和周期时间。如果喷涂过程做得不好，得到的漆层可能是不可接受的，通常是因为表面不平整，油漆附着力不好，或者油漆的颜色有变化。表面缺陷要么是由于涂漆不均匀造成的，要么是在漆膜沉积到表面后，作用在漆膜上的重力或毛细管力造成的。越来越多的人努力使用计算机模型来模拟涂漆过程，以减少将新汽车推向市场的成本和时间。该项目的主要目标是：1)观察静电旋转钟形雾化器中涂料的雾化。2)建立钟形雾化器中涂料雾化的模型，包括静电力、雾化气体和表面沟槽对钟形雾化器中涂料雾化的影响。3)确定涂料涂装参数对造成橙皮的影响。4)研究颗粒在撞击涂料液滴和干燥漆层中的运动。5)建立涂料干燥和橙皮形成的数值模型。

Painting of cars is a very important step in production, subject to strict quality control and involving multiple steps. Robots are used to manipulate paint atomizers that move along paths optimized to minimize both the volume of paint used and the cycle time. If the spraying process is not done properly the paint layer obtained may be unacceptable, typically because the surface is uneven, the paint does not adhere well, or there are variations in the colour of the paint. Surface defects either arise because of non-uniform paint application or are created by gravitational or capillary forces acting on the paint film after it has been deposited on the surface. Increasingly there are efforts to simulate, using compute models, the paint application process so as to reduce the cost and time of bringing a new automobile to market. The principal objectives of this project are to:1) Observe atomization of paint in electrostatic rotating bell atomizers.2) Develop models of paint atomization in bell atomizers, including the effect of electrostatic forces, atomizing gases, and surface grooves on the bell.3) Determine the effect of paint application parameters that cause orange peel.4) Study motion of particles in impacting paint droplets and drying paint layers.5) Develop numerical models of paint drying and orange peel formation.