| 摘要 |
PROBLEM TO BE SOLVED: To prevent projecting and recessed parts and fine cracks produced on the inner peripheral surface of a flow passage by rotating a roller relatively to a common rail to perform burnishing for the inner peripheral surface of a flow passage while tapping. SOLUTION: A roller burnishing device RB comprises plural rollers 2 for pulling a mandrel 1 axially relatively to a common rail 10 and engaging with the mandrel 1 on a conical surface 1a formed on the outer peripheral surface of the mandrel 1 to be freely rotated, and a retainer 3 for retaining the rollers 2 on the conical surface 1a of the mandrel 1. A burnishing device RB is introduced into a hollow part of a common rail 10 to be worked, so that plural rollers 2 rolling on the conical surface la of the mandrel 1 conducts rolling compaction for the inner peripheral surface 11 of the flow passage to perform roller burnishing. Thus, cracks and creased of the inner peripheral surface 11 of the flow passage can be prevented by rolling compact and tapping operation of the rollers 2. |
