## 3 Results
Figure 9a-h show the wear profile after the conditioning processes and the wear shape predicted by the developed simulation. Under all the conditions, the position of the inflection point and the overall shape are similar, except for the center region. In the case of a linear edge fast, a pad profile with an inflection point where the inclination of the pad shape changes at a distance of 300 mm from the center was obtained, and the prediction result also shows that the inflection point occurs at the same location. In addition, even in the case of a parabolic shape, as shown in Figure 9e, the shape is similar to the simulation result despite the complex shape in which the slope of the pad shape changes several times. The pad shape predicted by the developed simulation coincided well with the actual shape. Figure 7: Trajectory of working diamond abrasives on the pad with respect to the pad rotation speed and conditioning arm swing speed. of the pad in the area of 100 mm of the edge, and the pad becomes relatively thick. If the edge of the disc does not go over the edge of the pad sharply, the pad will have a kinematically W shape [18]. This value corresponds to the length of the diameter of the conditioner. As shown in Figure 9, approximately 100 mm of the edge zone has a shape with a slope under all conditions. To reduce the non-flat zone of the edge, we can use a conditioner disc with a small diameter or move the center of the conditioner disc closer to the edge of the pad. The graph in Figure 10a shows the result obtained when a conditioner with a diameter of 100 mm is applied under a controlled condition, and the graph below is the result obtained using a conditioner with a diameter of 60 mm. If the conditioner disc size is reduced from 100 mm to 60 mm by simulation, the slope zone decreases, as shown in Figure 10a. If the disc diameter is 100 mm, the inclined zone starts at 300 mm from the center of the pad. On the other hand, when the disc diameter is 60 mm, the start of the inclined zone changes to 340 mm, which is the difference in the size of the disc. Second, if the center of the conditioner disc is returned at 375 mm from the center of the pad, the slope zone is reduced compared with the return condition of 350 mm, as shown in Figure 10b and the graph below. The starting zone of the slope moves to the edge by 25 mm, which is the amount of change in the return position. However, because the developed simulation predicts the shape as a function of only the trajectory density, it is quite different from the actual pad shape. The left schematic shown in Figure 11 corresponds to when the return point is set to 350 mm. Compared with the case where the return point is set to 375 mm, the effect of increasing the pressure is insignificant owing to the large contact area and is largely consistent with the predicted results. On the other hand, if the amount of overhang is increased, as shown in the schematic on the right of Figure 11, the contact area rapidly narrows, and the pressure increases dramatically. The wear amount proportionally increases with the increase in the pressure [1]. Therefore, unlike the result of the trajectory density, in the real process, the pad edge area of the wear profile is flat, as shown in Figure 12a. As mentioned in the introduction, it is important to make the flat zone larger in terms of maintaining the pad shape, which is one of the main purposes of conditioning. The conditioning process was carried out for 2 h under the even condition and the 375 mm return point condition in which the overhang was applied under the controlled condition. Figure 12b shows the maximum and minimum pad thickness values measured over time, excluding the 40 mm radius of the center.