| 摘要 |
PURPOSE:To precisely maintain and manage the machining diameter of a workpiece such as a crankshaft or the like lathed with a broach by controlling the depth of cutting by the broach in accordance with a detection signal as a result of measurement of the diameter of the workpiece by a measuring device after cutting. CONSTITUTION:Spindle beds 2 for rotatably journalling a workpiece W such as a crankshaft or the like are mounted, facing together, on a bed 1, and further arched columns are arranged adjacent to the beds 2. A slide guide part 5 is provided in the upright section 4 of each arched column, and a cutting unit 6 is attached to the slide guide part 5. This cutting unit 6 is mounted on a slide bed 7 which is set at both ends on the slide guides 5. When the cutting units 6 are fed downward by driving a cutting feed motor 13, a broach 20 is fed toward the workpiece W on rotation in the direction perpendicular to the rotating axis of the workpiece W which is skived. Further, a machined diameter measuring device measures the diameter of the workpiece after machining so that the depth of cutting by the broach 20 is controlled in accordance with a signal as a result of the measurement.
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