Effects of Surface Grinding Parameters on the Surface Roughness of Aluminum 7075 Thin Plate

This research explores how surface grinding parameters affect the surface roughness of Aluminum 7075 thin plates, a material that is commonly utilized in the marine sector. A full factorial design of experiments with three factors at three levels was used to assess the impact of table speed, feed, and grinding depth on root mean square roughness (Rq) and average roughness (Ra). Measurements of surface roughness were conducted at three linear locations (10 mm, 25 mm, and 40 mm) along the plate to ensure both accuracy and consistency. Among the variables analyzed, the feed rate and grinding depth were identified as the most significant factors, exhibiting the highest standardized effect of 9.67 on both root mean square roughness and average roughness. This pronounced relationship suggests that higher feed and greater grinding depths enhance material removal and interaction between the tool and workpiece, resulting in increased roughness values. The table speed also had a notable impact on surface finish, with standardized effects of 6.84 and 5.78 for Rq and Ra, respectively; a rise in table speed was associated with more roughness, likely due to reduced material contact. The interaction between feed and grinding depth showed statistical significance, demonstrating standardized effects of 4.89 and 3.61 on Rq and Ra, respectively, reinforcing their combined effect on the formation of surface texture. The optimal grinding parameters were determined to be high table speed (50 spm), high feed (5 mm) and high grinding depth (1.0 mm).