| 摘要 |
PURPOSE:To sharply reduce the facility cost and device space by horning a work with one kind of a grindstone, changing and controlling the stroke position of a horning head to the position where horning can be performed with another kind of a grindstone, and horning the same work with two or more kinds of grindstones. CONSTITUTION:When grindstones are machined to the preset rough horning size, a rough horning drive stopping command is issued by the fixed size detecting action of an air nozzle 51, and grindstones 12 and 13 are shrunk by the ascent of a rod 23. The piston 43 of a stroke cylinder 42 is largely lowered by a grindstone changing command, and the stroke position of a horning head 11 is changed to the position where the inner periphery of a work W can be horned by the finishing grindstone 13. The grindstone expansion, grindstone rotation, and stroke action between an upper limit setter 48 and a lower limit setter 49 are again commanded, and the finishing horning by the finishing grindstone 13 is performed. |
