US 10,646,939 B2 · Wire electric discharge machine

Abstract

A wire electric discharge machine for machining a workpiece by causing a discharge between a wire electrode delivered from a wire bobbin and the workpiece. The wire electric discharge machine includes: a remaining length calculation unit that calculates a remaining length of the wire electrode based on electrode winding coefficients, bobbin draw-out radius correlation information, and a spool diameter of the wire bobbin. The electrode winding coefficients depend on a winding density of the wire electrode, an inner width of the wire bobbin, a wire diameter of the electrode wire, and a winding tension of the wire electrode. The bobbin draw-out radius correlation information is correlated with a bobbin draw-out radius that is a distance between a position at which the wire electrode wound around the wire bobbin is separated from the wire bobbin and a central axis of rotation of the wire bobbin.

Claims17

Dependent claims

A wire electric discharge machine for machining a workpiece by causing a discharge between a wire electrode delivered from a wire bobbin and the workpiece, the wire electric discharge machine comprising:

a pulley in contact with the wire electrode and arranged between the wire bobbin and a tension roller;
and
a wire remaining length estimating circuitry configured to calculate a remaining length of the wire electrode based on wire electrode winding coefficients, bobbin draw-out radius correlation information, and a spool diameter of the wire bobbin, the wire electrode winding coefficients representing a winding state of the wire electrode on the wire bobbin, the bobbin draw-out radius correlation information being correlated with a bobbin draw-out radius that is a distance between a position at which the wire electrode wound around the wire bobbin is separated from the wire bobbin and a central axis of rotation of the wire bobbin, wherein the wire electrode winding coefficients depend on an inner width of the wire bobbin, a wire diameter of the wire electrode, and a winding tension of the wire electrode;
and
the wire remaining length estimating circuitry is further configured to calculate the bobbin draw-out radius based on a rotation angle of the pulley.

2 more elements

a pulley in contact with the wire electrode and arranged between the wire bobbin and a tension roller;
remaining length calculation circuitry configured to calculate a remaining length of the wire electrode based on wire electrode winding coefficients, bobbin draw-out radius correlation information, and a spool diameter of the wire bobbin, the wire electrode winding coefficients representing a winding state of the wire electrode on the wire bobbin, the bobbin draw-out radius correlation information being correlated with a bobbin draw-out radius that is a distance between a position at which the wire electrode wound around the wire bobbin is separated from the wire bobbin and a central axis of rotation of the wire bobbin;
bobbin draw-out radius correlation information detection circuitry configured to detect the bobbin draw-out radius correlation information based on a rotation angle of the pulley;
a coefficient memory to store the wire electrode winding coefficients;
a spool diameter memory to store the spool diameter;
delivered length detecting circuitry configured to detect a delivered length of the wire electrode;
and
a wire electrode winding coefficient calculation circuitry configured to calculate the wire electrode winding coefficients based on the delivered length and transition of the bobbin draw-out radius correlation information corresponding to the delivered length of the wire electrode, and store the wire electrode winding coefficients in the coefficient memory.

5 more elements

a pulley in contact with the wire electrode and arranged between the wire bobbin and a tension roller;
remaining length calculation circuitry configured to calculate a remaining length of the wire electrode based on wire electrode winding coefficients, bobbin draw-out radius correlation information, and a spool diameter of the wire bobbin, the wire electrode winding coefficients representing a winding state of the wire electrode on the wire bobbin, the bobbin draw-out radius correlation information being correlated with a bobbin draw-out radius that is a distance between a position at which the wire electrode wound around the wire bobbin is separated from the wire bobbin and a central axis of rotation of the wire bobbin;
bobbin draw-out radius correlation information detection circuitry configured to detect the bobbin draw-out radius correlation information;
a coefficient memory to store the wire electrode winding coefficients;
a spool diameter memory to store the spool diameter;
and
delivered length detecting circuitry configured to detect a delivered length of the wire electrode, wherein
the bobbin draw-out radius correlation information detecting circuitry is further configured to detect a rotation speed of the pulley and detect the bobbin draw-out radius correlation information based on the delivered length and the rotation speed of the pulley.

5 more elements

a pulley in contact with the wire electrode and arranged between the wire bobbin and a tension roller;
remaining length calculation circuitry configured to calculate a remaining length of the wire electrode based on wire electrode winding coefficients, bobbin draw-out radius correlation information, and a spool diameter of the wire bobbin, the wire electrode winding coefficients representing a winding state of the wire electrode on the wire bobbin, the bobbin draw-out radius correlation information being correlated with a bobbin draw-out radius that is a distance between a position at which the wire electrode wound around the wire bobbin is separated from the wire bobbin and a central axis of rotation of the wire bobbin;
bobbin draw-out radius correlation information detection circuitry configured to detect the bobbin draw-out radius correlation information based on a rotation angle of the pulley;
a coefficient memory to store the wire electrode winding coefficients;
a spool diameter memory to store the spool diameter;
information reading circuitry configured to read the bobbin draw-out radius correlation information in an unused state displayed on the wire bobbin;
and
wire electrode winding coefficient calculation circuitry configured to calculate the wire electrode winding coefficients based on a length of the wire electrode calculated from a mass per unit length of the wire electrode and a mass of the wire electrode wound around the wire bobbin, the bobbin draw-out radius correlation information in an unused state, and the spool diameter.

5 more elements

Dependencies are inferred from the claim text.

Wire electric discharge machine

Life of this patent

Wire electric discharge machine

Life of this patent

Abstract

Claims17