The Optimization of Kinematic and Geometric Parameters in Two-Element Grinding Discs With a Central Rotational Axis for the Uniformity of Concrete Surface Treatment

Abstract

The last stage of grinding concrete surfaces is performed by floaters with solid grinding discs, where the working element consists of a solid wheel. The working element uses the full surface of the disc, ensuring maximum geometrical effectiveness. The disc rotates around its center and at the same time, it is in a steady progressive movement. The effectiveness chart Sg for the solid disc with common kinematic parameters has a local minimum at the inside and zero values on the edges of the machining area. Increasing the effectiveness of the machining at the edges is accomplished by overlapping areas of machining in subsequent cycles. Increasing the local minimum effectiveness can be achieved by applying a two-element disc consisting of concentric machining elements -ring and wheel. Optimal selection of the rotation speed and wheel radius gives better uniformity of two-element disc machining in comparison to the solid disc. The grinding uniformity of areas with widths smaller than the diameter of the disc can be achieved by machining them with the biggest effect uniformity area of action. The best effect can be achieved by using both methods at the same time.

Optimization of Kinematic and Geometric Parameters in Three-Element Grinding Discs With a Central Rotational Axis for the Uniformity of Concrete Surface Treatment

“…element grinding discs … 67 [5]. The task set out in the work is the optimal selection of the dimensions of the wheel and middle ring elements and their rotational speeds giving the best uniformity of surface treatment at the assumed value of geometric efficiency.…”

“…4 indicates the possibility of increasing the uniformity of impact by increasing the machining efficiency in the middle of the graph. This is possible by replacing the homogeneous full disc with a two-piece disc consisting of: a wheel located in the middle of the disc rotation and rings in such a way that they collectively fill the geometry of the full disc as shown in [5].…”

“…7. Graph of geometric efficiency S disc optimized for uniformity of machining with optimal overlays D=0,8m, Vp=0,1 m/s, ω a=0,049m, b=0,052m, Sg=16.3081m, ε=0,0696972m [5]…”

“…The standard deviation indicator element disc takes the value ε = 0.061994 m, and the machining uniformity is better element disc ε = 0.0696972m and the full disc whose Sg graph is shown in Figure 4 for which ε = 0.079m. The charts for multi-element discs show an increase in the geometric efficiency in the middle part caused by the operation of a circular element with increased Graph of geometric efficiency Sg for a two-element disc optimized for uniformity of machining with optimal =0,1 m/s, ω = -8,8 rad/s =16.3081m, ε=0,0696972m [5] Fig. 8.…”