Method for evaluating tool installation, and machine tool
AssigneeMakino Milling Machine Co., Ltd.
InventorYuji Takano
Life of this patent
Estimating the term…
Abstract
Provided is a method for evaluating tool installation when fastening a tool to a main shaft of a machine tool, wherein the method includes a storage step for storing a reference location of a draw bar at the time when the tool is contacting a mounting seat of the main shaft, in a state in which foreign matter has been removed from the surface of the mounting seat and from the contacting surface of the tool. The method for evaluating tool installation includes a measuring step for measuring a measurement location of the draw bar when the tool is installed on the main shaft, and a determination step for determining the installation state of the tool to be abnormal if a measurement-location error with respect to the reference location exceeds a predetermined determination range.
Claims3
A tool mount evaluation method when mounting a tool on a spindle by drawing a tool with a draw bar arranged in the spindle of a machine tool, the tool mount evaluation method comprising:
- a storage step for storing a position of the draw bar in an axial direction when the tool comes into contact with an attachment seat as a reference position in a state in which foreign substances on a surface of the attachment seat of the spindle and on a contact surface of the tool are removed;
- a measurement step for measuring a position of the draw bar in the axial direction when the tool is mounted on the spindle as a measured position;
- and
- a determination step for determining that a mounted state of the tool is abnormal when an error of the measured position with respect to the reference position exceeds a predetermined determination range,
- wherein dogs for detecting the measured position of the draw bar in the axial direction are disposed on the draw bar and on a piston that presses the draw bar, and
- in the measurement step, the measured position when the tool is mounted on the spindle and a measured position when the draw bar is drawn without mounting the tool on the spindle are detected by the dog disposed on the draw bar, and a measured position when the tool is released is detected by the dog disposed on the piston.
A machine tool comprising:
- a spindle device configured to draw a tool by a draw bar arranged in a spindle and mount the tool in the spindle;
- a position detector configured to detect a position of the draw bar in an axial direction;
- and
- a control device configured to control a machine tool, wherein
- the position detector includes dogs, disposed on the draw bar and on a piston that presses the draw bar, for detecting measured positions of the draw bar in the axial direction,
- the control device includes a storage unit configured to store the position of the draw bar in association with the tool, and a determination unit configured to determine a mounted state of the tool based on a measured position of the draw bar in the axial direction, which is detected when the tool is mounted on the spindle,
- the storage unit stores the position of the draw bar in the axial direction as a reference position, which is detected when the tool comes into contact with an attachment seat in a state in which foreign substances on a surface of the attachment seat of the spindle and on a contact surface of the tool are removed,
- the determination unit is configured to determine that the mounted state of the tool is abnormal when an error of the measured position with respect to the reference position exceeds a predetermined determination range, and
- the position detector detects the measured position when the tool is mounted on the spindle,
- a measured position when the draw bar is drawn without mounting the tool on the spindle, by using the dog disposed on the draw bar, and
- a measured position when the tool is released, by using the dog disposed on the piston.
Dependencies are inferred from the claim text.