A wire electrical discharge machine and a wire electrical discharge machining method are provided. The wire electrical discharge machine is equipped with a core position recognizing unit configured to recognize the position of a core which is fixed by a core fixing function, a core removal unit configured to remove the core, which is in the recognized position, from a workpiece on which machining has been performed, and a core removal determining unit configured to determine whether or not the core in the recognized position has actually been removed.

The invention relates to a stylus manufacturing method for a contact probe, the stylus including a stick-shaped body, a stem formed continuous to an end of the body and having a diameter smaller than that of the body, and a tip formed continuous to an end of the stem and having a diameter larger than that of the stem. The method includes: primary electrical-discharge-machining of subjecting a leading end of a stick-shaped base material to electrical-discharge-machining to form the tip, a stem end being continuous to the tip and having the same diameter as the stem, and a temporary tapered portion having a diameter increasing from the stem end toward a base end of the base material; polishing of the tip formed in the primary electrical-discharge-machining; and after the polishing, secondary electrical-discharge-machining of subjecting the base material at least at the temporary tapered portion to electrical-discharge-machining to form the stem.

In a wire electric discharge machine of the present invention, a control variable detection apparatus is an inter-pole voltage detection apparatus and detects an average inter-pole voltage as a control variable correlating with an inter-pole distance. The wire electric discharge machine comprises a machining feed speed calculation apparatus determining a machining feed speed on the basis of a deviation between target voltage set by a target value setting apparatus 7 and the average inter-pole voltage so as to eliminate the deviation. The wire electric discharge machine further comprises a feed speed distribution apparatus and a relative movement apparatus. The inter-pole distance can be kept constant by the relative movement of a wire electrode and a workpiece made on the basis of a command of thus determined machining feed speed.

Methods of manufacturing honeycomb-structure-forming extrusion dies having a number of slots for use in producing extruded articles having complex honeycomb patterns and extrusion dies for use in the manufacture of extruded honeycomb bodies. The method includes inserting a die insert having a runner and a number of teeth into a slot of an extrusion die such that each of the teeth blocks at least a portion of the slot of the extrusion die. The method further includes separating the runner from the teeth so that the teeth remain within the slot of the extrusion die.

The present invention provides a wire electrode supply apparatus for suppressing wire electrode driving vibration for wire electrodes having a wide range of diameters and formed of various materials, thereby improving processed surface roughness. The wire electrode supply apparatus includes a back tension adjustment unit that adjusts a back tension of the wire electrode drawn from a source bobbin, a tension applying unit, and a constant pressure ejecting unit that ejects the wire electrode with constant pressure and rate after the transference via the tension applying unit and an electrical discharge machining unit. The tension applying unit includes a low tension applying unit that applies a tension to the wire electrode, and a high tension applying unit that can supply a higher tension. After the high tension applying unit supplies a tension, the low tension applying unit supplies a tension. Otherwise, only the low tension applying unit supplies a tension.

The present invention provides a wire electrode supply apparatus for suppressing wire electrode driving vibration for wire electrodes having a wide range of diameters and formed of various materials, thereby improving processed surface roughness. The wire electrode supply apparatus includes a back tension adjustment unit that adjusts a back tension of the wire electrode drawn from a source bobbin, a tension applying unit, and a constant pressure ejecting unit that ejects the wire electrode with constant pressure and rate after the transference via the tension applying unit and an electrical discharge machining unit. The tension applying unit includes a low tension applying unit that applies a tension to the wire electrode, and a high tension applying unit that can supply a higher tension. After the high tension applying unit supplies a tension, the low tension applying unit supplies a tension. Otherwise, only the low tension applying unit supplies a tension.

Provided is a machining time prediction device including a predicted machining speed table where predicted machining speeds are registered in association with shape groups used for classification based on a shape of a machining path, a machining path generation unit generating machining path data including the machining path based on the program, a shape group determination unit determining which shape groups partial machining paths belong to, a path length addition unit adding and summarizing path lengths of the partial machining paths for the respective shape groups, a predicted machining time calculation unit calculating predicted machining times of the respective shape groups on the basis of a predicted machining speed table and the path lengths of the respective shape groups, a predicted machining time summation unit calculating a predicted machining time of the machining path by adding the predicted machining times of the respective shape groups, and a display unit displaying the predicted machining time of the machining path.

A controller controls cutting of simultaneously cutting wafers by performing electrical discharge machining while moving a workpiece relative to cutting wire sections in a direction at right angles to the cutting wire sections in a plane perpendicular to the axial direction of main guide rollers and leaving a connection at which a part of each wafer that has been incompletely cut is still connected to the workpiece, and shape correction of causing the cutting wire sections to perform scanning while performing electrical discharge machining along a path of the cutting wire sections in a cutting direction at the time of the cutting to simultaneously correct the shape of a plurality of cut surfaces that are cut at the time of the cutting.

A controller controls cutting of simultaneously cutting wafers by performing electrical discharge machining while moving a workpiece relative to cutting wire sections in a direction at right angles to the cutting wire sections in a plane perpendicular to the axial direction of main guide rollers and leaving a connection at which a part of each wafer that has been incompletely cut is still connected to the workpiece, and shape correction of causing the cutting wire sections to perform scanning while performing electrical discharge machining along a path of the cutting wire sections in a cutting direction at the time of the cutting to simultaneously correct the shape of a plurality of cut surfaces that are cut at the time of the cutting.

A machine learning device provided in a controller for controlling a wire electrical discharge machine uses state variables (including data relating to a correction amount, a machining path, machining conditions, and a machining environment) observed by a state observation unit and determination data acquired by a determination data acquisition unit to machine-learn a correction for a machining path. Using the learning result, the machining path can be corrected automatically and accurately on the basis of a partial machining path, the machining conditions and the machining environment of the machining performed by the wire electrical discharge machine.