基于ANSYS的拉削定位面优化设计

文章针对某型直齿轮拉削过程中出现的严重喇叭口问题,建立其三维几何模型,通过选取不同定位面,运用ANSYS软件对拉削过程中工件的变形进行有限元分析。并根据仿真模拟结果,更改拉削定位面,修改现场使用卡具结构,有效的改善了该工件产生的喇叭口现象,为后续拉削工艺的设计与优化提供有力的依据。     

Degradation of selected indoor air pollutants: Comparison study of photocatalytic,ozone-assisted photocatalytic and amine adsorption processes

Indoor air pollutants impact human health, comfort and productivity. The method of photocatalysis has been applied mainly in flow reactors and little information is available on indoor air pollutant removal in airtight reactors. In the paper, experiments were carried out to remove formaldehyde (HCHO), ammonia (NH₃) and volatile organic compounds (VOCs) in the airtight and ventilated chambers. Results demonstrated that 90.4% of HCHO, 92.3% of NH₃ and 57.9% of VOCs were removed in the amine adsorption process, while 67.5% (hereinbefore, these are the mass fraction) of HCHO, 60.0% of NH₃, and 61.2% of VOCs were removed in the photocatalytic process. However, ozone-assisted photocatalytic process showed great potential to degrade indoor air pollutants in the ventilated chamber. Factors and mechanisms of the photocatalytic degradation of HCHO, NH₃ and VOCs were also discussed.