Design and simulation analysis of rust removal grinding block on inner wall of elbow at constant pressure

To remove the embroidery layer on the inner wall of the elbow before coating, three kinds of grinding blocks, namely Block A, Block B and Block C, were designed to act on the 100-mm-diameter elbow. The removal result of the embroidery layer on the inner wall of the elbow bend was analyzed by using the grinding block for rust removal simulation. Firstly, the sizes of three kinds of grinding blocks were obtained by theoretical calculation. The radius and the center angle of concave arc of the block were 65.130~74.556 mm and 6.97°~7.98°, while those of convex arc were 145.522~147.618 mm and 6.06°~6.15°. The abrasive material on the grinding block was white corundum. Then, Solidworks and Creo were used for modeling and imported into Abaqus for simulation analysis. In the simulation process, it is necessary to ensure that the pressure of the grinding block on the inner wall of the elbow bend is constant and equal. Results show that when the grinding on the inner wall of the elbow by the grinding block B is stable, the range of the concave-arc grinding depth is 0.045 0～0.053 0 mm, whose average value is 0.049 8 mm and arithmetic average deviation is 0.001 6 mm. The arithmetic mean deviation of convex arc grinding depth with 38% abrasive rate is 2.2 × 10⁻⁴ mm. After data analysis, grinding stability of Block B is better than that of other two grinding blocks. It can be concluded that the rust removal effect of Block B is the best.