Abstract: There is provided a technique to estimate a cutting force by a new method other than use of a dynamometer. A machine tool capable of cutting a workpiece using a tool includes a first surface that receives a force due to the cutting of the workpiece, the first surface being located in the machine tool; and a second surface that receives a force due to the cutting of the workpiece, the second surface being located in the machine tool. The second surface is not parallel to the first surface, and the machine tool includes: a first strain sensor coupled to the first surface and the second surface; and an estimation unit that estimates a force applied to the tool, based on an output value of the first strain sensor during the cutting of the workpiece.

Abstract: A machine tool includes: a display; a tool configured to machine a workpiece; a spindle configured to rotate the tool or the workpiece; a sensor configured to detect a vibration frequency of the spindle or the tool; and a processor configured to control the machine tool. The processor is configured to: detect a chatter vibration in the spindle or the tool based on the vibration frequency; based on a frequency of the chatter vibration, a rotation speed of the spindle, and the number of cutting edges of the tool, calculate an order corresponding to the number of vibrations of the tool during a period of time until a current rotation angle of a first cutting edge of the tool reaches a current rotation angle of a second cutting edge of the tool; and present order information on the display, the order information indicating a magnitude of the calculated order.

Abstract: A machining condition determining apparatus (1) includes a first setter (2a) setting a cutting speed of a cutting tool, a storage (3) storing a maximum output value of a drive motor rotating a spindle holding the cutting tool and a number of revolutions of the drive motor corresponding to the maximum output value, a number-of-revolutions determiner (4) obtaining a steady-state value of the maximum output value of the drive motor stored in the storage (3) and determining a number of revolutions of the drive motor corresponding to the obtained steady-state value of the maximum output value, and a tool-diameter determiner (5) calculating a tool diameter of the cutting tool based on the cutting speed set by the first setter (2a) and the number of revolutions of the drive motor determined by the number-of-revolutions determiner (4).

Abstract: A machining condition determining apparatus (1) includes a first setter (2a) setting a cutting speed of a cutting tool, a storage (3) storing a maximum output value of a drive motor rotating a spindle holding the cutting tool and a number of revolutions of the drive motor corresponding to the maximum output value, a number-of-revolutions determiner (4) obtaining a steady-state value of the maximum output value of the drive motor stored in the storage (3) and determining a number of revolutions of the drive motor corresponding to the obtained steady-state value of the maximum output value, and a tool-diameter determiner (5) calculating a tool diameter of the cutting tool based on the cutting speed set by the first setter (2a) and the number of revolutions of the drive motor determined by the number-of-revolutions determiner (4).

Abstract: A machine tool includes: a display; a tool configured to machine a workpiece; a spindle configured to rotate the tool or the workpiece; a sensor configured to detect a vibration frequency of the spindle or the tool; and a processor configured to control the machine tool. The processor is configured to: detect a chatter vibration in the spindle or the tool based on the vibration frequency; based on a frequency of the chatter vibration, a rotation speed of the spindle, and the number of cutting edges of the tool, calculate an order corresponding to the number of vibrations of the tool during a period of time until a current rotation angle of a first cutting edge of the tool reaches a current rotation angle of a second cutting edge of the tool; and present order information on the display, the order information indicating a magnitude of the calculated order.

Abstract: A machining management apparatus includes a tool information storage storing therein information relating to each cutting tool used in a machine tool and storing therein a coefficient n and a coefficient C in a tool life equation corresponding to tool life influencing factors including at least a workpiece and a cutting tool material, and an adapted cutting speed calculator executing a machining condition receiving processing of receiving information on the tool life influencing factors and information on a desired cutting speed, a coefficient recognition processing of recognizing the coefficient n and the coefficient C corresponding to the tool life influencing factors by referring to the tool information storage based on the received tool life influencing factor information, and a cutting speed calculation processing of calculating a cutting speed adapted to the desired cutting time according to the tool life equation based on the recognized coefficient n and coefficient C.

Abstract: A machining status display apparatus includes a display device having a display screen, a stability lobe picture creator creating, based on specifications of a tool to be used, display picture data for displaying a stability lobe as a correlation diagram between a spindle rotation speed and a limit depth of cut of the tool above which regenerative chatter occurs, a first machining information picture creator creating display picture data for displaying machining related information other than regenerative chatter corresponding to set machining conditions, and a display controller displaying the stability lobe and the machining related information with the stability lobe and the machining related information superimposed one on another on the display screen of the display device based on the display picture data created by the stability lobe picture creator and the display picture data created by the first machining information picture creator.

Abstract: A machining status display apparatus includes a display device having a display screen, a stability lobe picture creator creating, based on specifications of a tool to be used, display picture data for displaying a stability lobe as a correlation diagram between a spindle rotation speed and a limit depth of cut of the tool above which regenerative chatter occurs, a first machining information picture creator creating display picture data for displaying machining related information other than regenerative chatter corresponding to set machining conditions, and a display controller displaying the stability lobe and the machining related information with the stability lobe and the machining related information superimposed one on another on the display screen of the display device based on the display picture data created by the stability lobe picture creator and the display picture data created by the first machining information picture creator.

Abstract: A machining management apparatus includes a tool information storage storing therein information relating to each cutting tool used in a machine tool and storing therein a coefficient n and a coefficient C in a tool life equation corresponding to tool life influencing factors including at least a workpiece and a cutting tool material, and an adapted cutting speed calculator executing a machining condition receiving processing of receiving information on the tool life influencing factors and information on a desired cutting speed, a coefficient recognition processing of recognizing the coefficient n and the coefficient C corresponding to the tool life influencing factors by referring to the tool information storage based on the received tool life influencing factor information, and a cutting speed calculation processing of calculating a cutting speed adapted to the desired cutting time according to the tool life equation based on the recognized coefficient n and coefficient C.

Abstract: An apparatus includes a machining executing part causing a machine tool to execute an operation of, while changing a spindle rotation speed of the machine tool in a stepwise manner, machining a workpiece by a predetermined distance or for a predetermined period of time at each spindle rotation speed, a displacement detector detecting a position displacement of a tool during the machining, a cutting force detector detecting a cutting force applied to the tool, a frequency analysis part performing frequency analysis on displacement data and cutting force data for each rotation speed to calculate a displacement spectrum and a cutting force spectrum, and a natural frequency deriving part calculating a compliance spectrum for each spindle rotation speed by deriving the displacement spectrum by the cutting force spectrum, calculating an integrated compliance spectrum by superimposing the compliance spectra, and deriving, as a natural frequency, a frequency showing the largest compliance value.