Working machinery, workpiece diameter determination method, and workpiece diameter determination procedure

Abstract

[Abstract] [Project] The objective is to provide a machine tool that can suppress the increase in average cycle time even when the number of defective workpieces has increased. [Solution] The machine tool 1 includes: a spindle for holding an unprocessed workpiece or a processed workpiece; a tool holder for holding and processing the unprocessed workpiece or the processed workpiece held by the spindle; a position sensor for detecting the coordinates of the outer peripheral surface of the processed workpiece held by the spindle; and a control device for controlling the spindle and the tool holder. The control device performs the following processes: peripheral detection processing, which uses the position sensor to detect the coordinates of at least three points on the outer peripheral surface of the processed workpiece, which has at least a portion of its outer edge having an arc-shaped cross-section; a distance calculation processing, which calculates the distance between the coordinates of the at least three points detected in the peripheral detection processing and a predetermined center coordinate, i.e., the distance; a judgment processing, which determines whether the deviation of the calculated distance is within a predetermined range; and an alarm output processing, which outputs an alarm signal indicating that the processed workpiece does not have the expected diameter when the judgment processing determines that the deviation is within the predetermined range.

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