| 摘要 |
PURPOSE:To facilitate fabrication of a side rail in such a way that regardless of its minimum allowable width, it is provided with a flame coated layer of uniform thickness possessing wear resistance on its circumferential sliding surface, and the circumferential angle of chamfer between the flame coated face and side face is ground and finished into a specified angle. CONSTITUTION:In manufacturing, a long and relatively thin steel belt material 1 is spirally wound around the outer periphery of a metal core 2, the both sides are pressed with pressure with push plates 3 to prevent it from being coiled back. Next, the outer peripheral side edge of the steel belt material 1 is ground, until a foundation processed faces 4, with the predetermined diamter (a') is formed, and flame coated layer 5 is provided by welding wear-resisting flame coating material in the process of flame coating. After that, the outer diameter is ground to a determined diameter. Then, a screw grinder with multiple V-shaped cutters shall be used in such a fabrication as providing an angle of chamfer alpha less than 45 deg. at the border (b) on the circumferential side edge of raw material adjacent to the circumferential face of the flame coated layer 5. Then, the spirally wound raw material 1 is divided and cut off in the axial direction of the metal core 2, and made into separate side rails. |
