| 摘要 |
PROBLEM TO BE SOLVED: To provide a tool tip position correction device capable of correcting a tip position of a tool fitted to a main shaft with high precision.SOLUTION: A displacement measurement part 21 measures displacement δa based upon elongation of a main shaft 12 due to heat generation accompanying rotation of the main shaft 12 from a main shaft reference position Ps to a tool reference position Pt by receiving a detection signal from a sensor 142 of a displacement measurement device 14. A displacement calculation part 23 calculates displacement δb based upon elongation and centrifugal expansion of a tool holder H due to heat generation from the rotational frequency of the main shaft 12, the length and diameter of the tool holder H and a relational expression stored in a storage part 22. A correction quantity calculation part 24 calculates the sum δa+δb of the displacement δa, measured by the displacement measurement part 21, based upon the elongation of a main shaft 12 due to the heat generation accompanying the rotation of the main shaft 12 and the displacement δb, calculated by the displacement calculation part 23, based upon the elongation and centrifugal expansion of the tool holder H due to the heat generation as the correction quantity of a tip position of a rotary tool with respect to the main shaft reference position Ps. |
