Motion evaluation method, evaluation device, parameter adjustment method using said evaluation method, workpiece machining method, and machine tool
AssigneesNational University Corporation Kobe University, Makino Milling Machine Co., Ltd.
InventorsRyuta SATO, Takumi NAKANISHI, Mitsunari ODA, Nobu NAKAYAMA
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Abstract
In this motion evaluation method, which uses a circular motion test to evaluate motion characteristics of a numerically controlled machine tool, a normal direction change rate of a trajectory is calculated from a circular motion trajectory, the normal direction change rate of the trajectory is displayed in polar coordinates, and the motion characteristics of the numerically controlled machine tool are evaluated.
Claims14
A motion evaluation method for evaluating a motion characteristic of a numerically controlled machine tool using a circular motion test, the method comprising the steps of:
- calculating a normal direction change rate of a trajectory from a circular motion trajectory, and
- displaying the normal direction change rate of the trajectory as polar coordinates.
A motion evaluation device for evaluating a motion characteristic of a numerically controlled machine tool from a circular motion test, the device comprising:
- a normal direction change rate calculation unit for calculating a normal direction change rate from motion trajectory data when a spindle of a machine tool moves circularly,
- a visible limit data storage unit for storing data related to a limit normal direction change rate at which a shape change can be visually recognized by a person,
- a polar coordinate change unit for changing the normal direction change rate calculated by the normal direction change rate calculation unit to polar coordinate data, and
- a display unit for displaying, as polar coordinates, the normal direction change rate which was changed to polar coordinate data along with a visible limit of the visible limit data storage unit.
A parameter adjustment method for evaluating a motion characteristic of a numerically controlled machine tool using a circular motion test and adjusting a parameter of a controller, the method comprising the steps of:
- calculating a normal direction change rate of a trajectory from a circular motion trajectory,
- displaying the normal direction change rate of the trajectory as polar coordinates, and
- adjusting a control parameter of the machine tool so as to make a maximum value of the normal direction change rate of the trajectory not greater than a predetermined value.
A workpiece machining method, comprising the steps of:
- feeding a spindle along a predetermined circumference within a predetermined plane and calculating a normal direction change rate of a trajectory from a circular motion trajectory of the spindle,
- displaying the normal direction change rate of the trajectory as polar coordinates, and
- changing a control parameter of the machine tool so as to make a maximum value of the normal direction change rate of the trajectory not greater than a predetermined value.
A machine tool including an orthogonal at least three-axis feed device, and which machines a workpiece by moving a tool mounted on a spindle and the workpiece relative to each other, the machine tool comprising:
- a normal direction change rate calculation unit for calculating a normal direction change rate from motion trajectory data when a spindle of a machine tool moves circularly,
- a visible limit data storage unit for storing data related to a limit normal direction change rate at which a shape change can be visually recognized by a person,
- a polar coordinate change unit for changing the normal direction change rate calculated by the normal direction change rate calculation unit to polar coordinate data,
- a display unit for displaying, as polar coordinates, the normal direction change rate which was changed to polar coordinate data along with a visible limit of the visible limit data storage unit, and
- a parameter change unit for changing a control parameter of the machine tool so as to make a maximum value of the normal direction change rate of the trajectory not greater than a predetermined value.
Dependencies are inferred from the claim text.