| 摘要 |
PROBLEM TO BE SOLVED: To provide a round pipe reducing the slip between the round pipe and rolls and having uniform polished surface quality in a wet grinding wheel polishing centerless round pipe feed device. SOLUTION: A rubber lining 13 dispersed with a base material rubber 11 and granular rubbers 12 having a hardness difference is provided on each roll peripheral face of the rotary roll, feed roll and presser roll of a centerless feed device, and single or multiple grooves 15 inclined relative to the roll width direction are formed. The roll peripheral face has the hardness difference and the grooves 15 for discharging an abrasive liquid, the slip between the rolls and a round pipe is prevented, and the round pipe is polished by a wet grinding wheel under a stable condition.
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