| 摘要 |
PURPOSE:To reduce the wire cost and to stabilize the cutting accuracy and cutting efficiency, by enlarging the diameter at both end sides of a resin made sleeve on which the grooves in the same depth are engraved more than the diameter of a center part, and forming the shape that the wire winding radius of curvature becomes almost uniform in the roll axial direction with a thermal expansion. CONSTITUTION:A grooved roller 20 is made in a hourglass shape larger than the outer diameter Db of a center part 21b at the outer diameter Da of both ends 21a a resin made sleeve, and is engraved with groove 11-1 in the same width (g) on the resin made sleeve 21, both ands 21a and center 21b of the sleeve are manufactured so that wire winding radius of the groove 11-1 becomes uniform in the roll axial direction, in the state of the grooved roller 20 under cutting being subjected to temperature rising. Because of its becoming in the structure that the wire winding radius after the thermal expansion of the sleeve becomes uniform, the disconnection generation rate of the wire caused by the thermal expansion of sleeve under cutting becomes extremely low, and not only the operation rate of wire saw can drastically be improved but also the loss of a work due to disconnection can drastically by reduced. |
