公开(公告)号：US11162966B2

公开(公告)日：2021-11-02

申请号：US17061714

申请日：2020-10-02

Applicant: OKUMA CORPORATION

Inventor： Shunsuke Fujimaki ,  Akihide Hamaguchi

IPC: G01P3/02 ,  G01P1/07

Abstract: A monitoring device of a main spindle rotation speed in a machine tool displays a variation state of the rotation speed by a rotation speed variation unit using a display unit in the machine tool. The monitoring device includes a drawing unit, a variation position display unit, and a reduction effect index display unit. The drawing unit is configured to display a variation diagram that illustrates a relationship between a variation amplitude and a variation cycle of the rotation speed. The reduction effect index display unit is configured to display a reduction effect index on the variation diagram. The reduction effect index represents a reduction effect of chatter vibration. The reduction effect index is calculated based on a speed ratio that is a ratio of a rotation speed of one rotation before to a rotation speed at an identical rotation position of the main spindle at any given timing.

公开(公告)号：US11243221B2

公开(公告)日：2022-02-08

申请号：US17061693

申请日：2020-10-02

Applicant: OKUMA CORPORATION

Inventor： Shunsuke Fujimaki ,  Akihide Hamaguchi

IPC: G01P3/02 ,  G01P1/07

Abstract: A monitoring device of a main spindle rotation speed in a machine tool displays a variation state of the rotation speed by a rotation speed variation unit using a display unit in the machine tool. The monitoring device includes a variation value setting unit, a drawing unit, a first display unit, and a settable range calculating unit. The settable range calculating unit is configured to calculate a settable range of a variation amplitude and a variation cycle based on a calculation formula. The calculation formula includes the variation cycle, a difference between a first rotation speed and a second rotation speed at mutually different timings among the rotation speeds varied relative to a reference rotation speed, an inertia of a rotating body, a rated output of a motor that drives a main spindle, and a usage proportion to the rated output of the motor.