JPH07204939A - Wire cut electric discharge machining and wire cut electric discharge machine - Google Patents

Abstract

PURPOSE:To reduce the amount of consumption of wire by lowering the wire winding speed of a wire electrode so that the final machining accuracy can be met by the combination of machining condition packs used from the start to end of wire cut electric discharge machining. CONSTITUTION:A wire winding speed for each of all machining condition packs used during machining is changed and the consumed amount of a wire electrode 1 can' be reduced by turning on a wire electrode reduction switch 24 connected to an NC device 10 of a wire cut electric.d discharge machine. Also, when the consumed amount of the wire electrode l is reduced, the reduced amount is displayed on a CRT display 21. Then the wire electrode 1 is added in the offset direction relative to a workpiece 2 by the lowering of machining accuracy caused by lowering of the wire winding speed, and thus the taper angle is compensated and fixed. Thus the amount of consumption of the wire electrode 1 can be reduced easily, and also the lowering of the final machining accuracy can be grasped by an worker.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-cut electric discharge machining method and a wire-cut electric discharge machine for reducing the consumption of wire electrodes by controlling the wire winding speed.

[0002]

2. Description of the Related Art Conventionally, a wire-cut electric discharge machine processes a workpiece by applying a pulsed machining voltage between a wire electrode wound by a winding roller and the workpiece. The configuration of this wire cut electric discharge machine will be described with reference to FIG. In FIG. 8, 1 is a wire electrode, 2 is a work piece, 3 is a tension roller for applying a tension to the wire electrode 1, 4 is a wire bobbin for storing and supplying the unprocessed wire electrode 1, and 5 is the wire electrode 1 designated. Winding roller for winding at a wire winding speed, 6 a collection box for collecting the processed wire electrode 1, 7 a U-axis motor, 8 a V-axis motor, 9a,
Reference numeral 9b is a pair of upper and lower wire guides that guide the wire electrode 1 above and below the workpiece 2. Reference numeral 10 denotes an NC (Numerical Control) device, which drives the U-axis motor 7 and the V-axis motor 8 based on a control signal from the NC device 10 to drive the upper wire guide 9a.
Is controlled in the U-axis direction and the V-axis direction, the wire winding speed of the winding roller 5 that winds the wire electrode 1 is controlled, and
The X-axis motor 17 and the Y-axis motor 18 are driven to control the machining table 16 in the X-axis direction and the Y-axis direction. Reference numeral 21 is a CRT display for displaying the status of the wire cut electric discharge machine, 22 is an operation switch panel for operating the NC device 10, and 23 is a content of a magnetic disk in which an NC program for wire cut electric discharge machining is stored. It is a magnetic disk reader for reading.

FIG. 9 is a block diagram showing a detailed structure of the NC device 10 in the wire cut electric discharge machine shown in FIG.
In FIG. 9, 11 is an NC program executing means for interpreting an NC program (processing program) given by a paper tape, a magnetic disk or the like, and 12 is a processing condition for storing various data necessary for processing such as a processing condition pack described later. A data table, 13 is a take-up roller control means for outputting a control signal to the take-up roller 5, 14 is a control signal for the U-axis motor 7 and the V-axis motor 8, and a taper of the wire electrode 1 for the workpiece 2 A taper angle control means for controlling the angle, and 15 is table control means for outputting a control signal to the X-axis motor 17 and the Y-axis motor 18 to control the processing table 16.

Next, a processing procedure of the workpiece 2 in the wire cut electric discharge machine equipped with the NC device 10 will be described.
In FIG. 8, the workpiece 2 is fixed on the processing table 16, and the wire electrode 1 extends from the wire bobbin 4 to the tension roller 3, the upper wire guide 9 a, and the lower wire guide 9.
The magnetic disk is taken up by the take-up roller 5 via b, the magnetic disk is set in the magnetic disk reader 23, and processing is started. The NC program executing means 11 interprets the NC program, and according to the instruction, the machining condition data table 1
2, the required processing conditions are called, a signal for controlling the processing power source is output, the speed command value for the winding roller 5 is output to the winding roller control means 13, and the taper angle control means 1 is output.
4 outputs an angle command to the table 4, and further outputs a movement command for the machining table 16 to the table control means 15 to proceed with machining.

The wire-cut electric discharge machining is performed by applying a pulse-like machining voltage between the wire electrode 1 and the workpiece 2 and by the discharge energy generated at that time. At this time, since the wire electrode 1 is constantly supplied from the wire bobbin 4, the wire electrode 1 can be continuously processed without being cut due to wear. The wire winding speed (m / min) determined by the supply speed of the wire electrode 1, that is, the rotation speed of the winding roller 5, the applied machining voltage (V), the machining on time (second), the rest time (second), the machining Various processing conditions such as the off time (seconds) are summarized by the plate thickness t (mm), the wire diameter φ (mm), and the material of the workpiece, which is called a processing condition pack. FIG. 10 shows a processing condition pack, and FIG. 11 shows a combination of processing condition packs. By supplying the combination of the processing condition pack and the processing condition pack from the maker, the worker can perform the first second third processing required. It can be done easily by checking the final processing accuracy.

[0006]

By the way, in such a conventional method, there is a demand to reduce the consumption of the wire electrode because the accuracy is lower than the final processing accuracy obtained by the combination of the processing condition packs supplied by the manufacturer. Sometimes
All the wire winding speeds used for processing should be changed in advance, or it should be changed each time the wire winding speed condition changes, and the operator himself must judge how much the final processing accuracy will decrease. However, this work is extremely difficult unless it is an expert who has abundant experience and knowledge of various processing conditions.

Here, as a prior art document relating to the wire cut electric discharge machine, one disclosed in Japanese Patent Laid-Open No. 62-287937 is known. In this device, the wire winding speed for the wire electrode is determined from various processing conditions by inputting the wire electrode wear rate. However, in the case of machining while changing the machining conditions for one machining shape many times, the final machining accuracy cannot be satisfied even if the wear rate of the wire electrode is controlled based on the individual machining conditions. was there.

Further, those disclosed in Japanese Patent Laid-Open Nos. 54-156295 and 61-125736 are known. Of these, the former detects the change in machining voltage or machining current to control the wire electrode supply speed (wire winding speed), and the latter detects leakage current to determine the gap between electrodes and determines the wire electrode delivery speed (wire winding speed). A technique is described in which the amount of electrode consumption is reduced by controlling the winding speed). In these, it is not mentioned that the structure is complicated to detect the voltage or the current and the final processing accuracy is ensured. Furthermore, JP-A-60-1
The one disclosed in Japanese Patent No. 97320 is a method for measuring the remaining amount of the wire electrode at the wire feeding speed (wire winding speed) by CR.
Although the technique of displaying T is described, it does not display the amount of wire reduction when the wire feed speed is reduced.

Therefore, the present invention has been made to solve such a problem, and considers a combination of machining condition packs used from the start of wire cutting electric discharge machining to the end of the machining so as to satisfy the final machining accuracy. An object of the present invention is to provide a wire-cut electric discharge machining method and a wire-cut electric discharge machine capable of reducing the wire winding speed of a wire electrode and reducing the amount of wire consumption.

[0010]

According to a first aspect of the wire-cut electric discharge machining method of the present invention, a pulse voltage is applied between a wire electrode and a workpiece to generate an electric discharge between electrodes facing each other. A method for processing the workpiece with electric discharge energy, storing processing conditions used from the start of the wire-cut electric discharge processing to the end of the processing, and the wire winding speed for winding the wire electrode is stored in a winding roller control signal. Based on the taper angle control signal, and the wire electrode reduction switch is appropriately operated to control the winding roller control signal and the taper angle control. Use one or more of the signals,
Control the wire winding speed based on the processing conditions,
The consumption of the wire electrode is reduced.

A wire cut electric discharge machine according to a second aspect of the present invention applies a pulse voltage between a wire electrode and a work piece to generate an electric discharge between electrodes facing each other, and the electric discharge energy causes the work piece to be processed. Machining an object, machining condition storing means for storing machining conditions used from the start of wire cut electric discharge machining to the end thereof, and winding roller control means for controlling a wire winding speed for winding the wire electrode. And a taper angle control means for controlling an inclination angle of the wire electrode with respect to the workpiece, and a wire electrode reduction switch, whereby the winding roller control means,
Wire electrode reducing means for controlling the wire winding speed based on the processing conditions stored in the processing condition storage means and reducing the consumption of the wire electrodes by using one or more of the taper angle control means. It is equipped with.

According to a third aspect of the wire-cut electric discharge machine, a pulse voltage is applied between the wire electrode and the workpiece to generate an electric discharge between the electrodes facing each other, and the electric discharge energy causes the electric discharge of the workpiece. Machining an object, machining condition storing means for storing machining conditions used from the start of wire cut electric discharge machining to the end thereof, and winding roller control means for controlling a wire winding speed for winding the wire electrode. And a taper angle control means for controlling an inclination angle of the wire electrode with respect to the workpiece, and a wire electrode reduction switch, whereby the winding roller control means,
Wire electrode reducing means for controlling the wire winding speed based on the processing conditions stored in the processing condition storage means and reducing the consumption of the wire electrodes by using one or more of the taper angle control means. When the consumption of the wire electrode is being reduced by the wire electrode reduction means, a reduction display means for displaying a reduction in progress display and a reduction amount display is provided.

According to a fourth aspect of the present invention, there is provided a wire cut electric discharge machine in which a pulse voltage is applied between a wire electrode and a work piece to generate an electric discharge between electrodes facing each other, and the electric discharge energy causes the work piece to be processed. Machining an object, machining condition storing means for storing machining conditions used from the start of wire cut electric discharge machining to the end thereof, and winding roller control means for controlling a wire winding speed for winding the wire electrode. And a taper angle control means for controlling an inclination angle of the wire electrode with respect to the workpiece, and a wire electrode reduction switch, whereby the winding roller control means,
Wire electrode reducing means for controlling the wire winding speed based on the processing conditions stored in the processing condition storage means and reducing the consumption of the wire electrodes by using one or more of the taper angle control means. The taper angle control unit corrects the taper angle controlled by the taper angle control unit in accordance with the reduction amount of the final machining accuracy caused by the reduction of the wire winding speed of the wire electrode and the plate thickness of the workpiece by the wire electrode reduction unit. And a taper angle correcting means.

[0014]

According to the first aspect of the present invention, the wire electrode reduction switch is appropriately operated to control the winding roller control signal for controlling the wire winding speed for winding the wire electrode and the inclination angle of the wire electrode with respect to the workpiece. One or more of the taper angle control signals to be used are used, and the wire winding speed is controlled based on the stored machining conditions used from the start of the wire cut electric discharge machining to the end of the machining, and the consumption of the wire electrode is reduced. .

According to another aspect of the present invention, the wire electrode reduction switch is appropriately operated to control the winding roller control means for controlling the wire winding speed for winding the wire electrode and the inclination angle of the wire electrode with respect to the workpiece. One or more of the taper angle control means are used, and the wire winding speed is controlled by the wire electrode reduction means based on the processing conditions stored in the processing condition storage means from the start to the end of the wire cut electric discharge machining. As a result, the consumption of wire electrodes is reduced.

In the present invention, the wire electrode reduction switch is appropriately operated to control the winding roller control means for controlling the wire winding speed for winding the wire electrode, and the inclination angle of the wire electrode with respect to the workpiece. One or more of the taper angle control means are used, and the wire winding speed is controlled by the wire electrode reduction means based on the processing conditions stored in the processing condition storage means from the start to the end of the wire cut electric discharge machining. As a result, the consumption of wire electrodes is reduced. When the consumption of the wire electrode is being reduced, the reduction display means displays the reduction in progress and the reduction amount.

In the present invention, the wire electrode reduction switch is appropriately operated to control the winding roller control means for controlling the wire winding speed for winding the wire electrode, and the inclination angle of the wire electrode with respect to the workpiece. One or more of the taper angle control means are used, and the wire winding speed is controlled by the wire electrode reduction means based on the processing conditions stored in the processing condition storage means from the start to the end of the wire cut electric discharge machining. As a result, the consumption of wire electrodes is reduced. When the wire winding speed of the wire electrode decreases, the wear of the wire electrode increases. Therefore, the taper angle correction means adjusts the taper angle by the taper angle control means in response to the reduction amount of the final processing accuracy and the plate thickness of the workpiece. It

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wire-cut electric discharge machining method and a wire-cut electric discharge machine according to the present invention will be described below with reference to specific embodiments. <First Embodiment> FIG. 1 is a schematic view showing the overall configuration of a wire cut electric discharge machine according to the first embodiment of the present invention, and FIG. 2 is an NC diagram of the wire cut electric discharge machine according to the first embodiment of the present invention. It is a block diagram which shows the detailed structure of an apparatus. It should be noted that the same reference numerals and symbols are given to those having the same configuration or corresponding portions as those of the above-described conventional apparatus.
In FIG. 1, 1 is a wire electrode, 2 is a work piece, 3 is a tension roller for applying a tension to the wire electrode 1, 4 is a wire bobbin for storing and supplying the unprocessed wire electrode 1, and 5 is the wire electrode 1 designated. A winding roller for winding at a wire winding speed, 6 is a collecting box for collecting the processed wire electrode 1,
7 is a U-axis motor, 8 is a V-axis motor, and 9a and 9b are a pair of upper and lower wire guides for guiding the wire electrode 1 above and below the workpiece 2. Further, 16 is a processing table for fixing the workpiece 2, 17 is an X-axis motor,
18 is a Y-axis motor. Further, reference numeral 10 is an NC device, and based on a control signal from the NC device 10, the U-axis motor 7
And the V-axis motor 8 is driven to move the upper wire guide 9a to U.
Controlled in the axial direction and the V-axis direction, the wire winding speed of the winding roller 5 that winds the wire electrode 1 is controlled, and the X-axis motor 17 and the Y-axis motor 18 are driven to move the machining table 16 in the X-axis direction. And in the Y-axis direction. 21 is a CRT display for displaying the status of the wire cut electric discharge machine, 2
2 is an operation switch panel for operating the NC device 10, 23
Is a magnetic disk reader for reading the contents of a magnetic disk in which an NC program for wire cut electric discharge machining is stored, and 24 is a wire electrode reduction switch for reducing the consumption of wire electrodes.

FIG. 2 is a block diagram showing the detailed arrangement of the NC device 10 in the wire cut electric discharge machine shown in FIG.
In FIG. 2, 11 is an NC program executing means for interpreting and executing an NC program (processing program) given by a paper tape, a magnetic disk or the like, 12 is a processing condition data table for storing various processing conditions, and 13 is a take-up roller 5. Take-up roller control means for outputting a control signal to
A taper angle control means for outputting a control signal to the shaft motor 7 and the V-axis motor 8 to control the processing taper angle of the wire electrode 1 with respect to the workpiece 2, and 15 for supplying a control signal to the X-axis motor 17 and the Y-axis motor 18. It is a table control means for outputting and controlling the processing table 16.

Next, the processing procedure of the workpiece 2 in the wire cut electric discharge machine equipped with the NC device 10 of this embodiment will be described. In FIG. 1, a workpiece 2 is a processing table 1
6, the wire electrode 1 is wound up from the wire bobbin 4 by the winding roller 5 via the tension roller 3, the upper wire guide 9a and the lower wire guide 9b.
The magnetic disk is set in the magnetic disk reader 23 and processing is started. NC program executing means 11 is NC
The program is interpreted, necessary machining conditions are called from the machining condition data table 12 according to the command, a signal for controlling the machining power source is output, and a speed command for the take-up roller 5 is output to the take-up roller control means 13. , Outputs an angle command to the taper angle control means 14, and further, the processing table 1
A movement command for 6 is output to the table control means 15 to proceed with machining.

The wire-cut electric discharge machining is performed by applying a pulse-like machining voltage between the wire electrode 1 and the workpiece 2 and by the discharge energy generated at that time. At this time, since the wire electrode 1 is constantly supplied from the wire bobbin 4, the wire electrode 1 can be continuously processed without being cut due to wear. The wire winding speed (m / min) determined by the supply speed of the wire electrode 1, that is, the rotation speed of the winding roller 5, the applied machining voltage (V), the machining on time (second), the rest time (second), the machining Various processing conditions such as the off time (seconds) are summarized by the plate thickness t (mm), the wire diameter φ (mm), and the material of the workpiece, which is called a processing condition pack. FIG. 10 shows a processing condition pack, and FIG. 11 shows a combination of processing condition packs. By supplying the combination of the processing condition pack and the processing condition pack from the maker, the worker can perform the first second third processing required. It is possible to check the final processing accuracy and easily perform it.

Further, in this embodiment, N as described below is used.
It is intended to reduce the consumption of the wire electrode 1 while ensuring a predetermined final machining accuracy by the program interpretation and execution processing of the NC program execution means 11 of the C device 10. FIG. 3 shows the NC program executing means 11 of the NC device 10 of the wire cut electric discharge machine according to the first embodiment of the present invention.
6 is a flowchart showing a wire winding speed changing routine executed by decoding in step S1. The operator installs the workpiece 2, sets the magnetic disk storing the NC program in the magnetic disk reader 23, and then gives an instruction to start the processing. Then, in step S11, it is determined whether the wire electrode reduction switch 24 is turned on. Step S
If the wire electrode reduction switch 24 is off at 11, the wire winding speed is kept at the preset speed, and this routine ends.

On the other hand, the operator is required to operate the wire electrode reduction switch 1
When 6 is turned on and the determination in step S11 is YES, the process proceeds to step S12, and the combination of the pre-specified machining condition packs used by the machining end stored in the machining condition data table 12 is read. Next, the process proceeds to step S13, and the rule and data as shown in FIG. 4 in which the manufacturer has measured the deterioration of the final machining accuracy in advance, that is, the wire winding speed for each machining condition pack when the predetermined rule is used ( m / min) and the final processing accuracy (μm), the reduction amount of how much the wire winding speed can be reduced for each processing condition pack is calculated. Next, the process proceeds to step S14, and the wire winding speed for each processing condition pack is changed. Then, the process proceeds to step S15, and the command value is output to the winding roller control means 13. In this way, by changing the wire winding speed with respect to the wire electrode 1, the consumption amount of the wire electrode 1 can be reduced. The rules and data used in the present embodiment are not one type, and as shown in FIG. 4, the wire winding speed changed for each processing condition pack corresponding to the rule and the final processing accuracy resulting therefrom are displayed. You can also select and prepare multiple types of tables.

As described above, in the wire-cut electric discharge machine according to the first embodiment of the present invention, a pulse voltage is applied between the wire electrode 1 and the workpiece 2, and the electric discharge is generated between the two electrodes facing each other. In the wire-cut electric discharge machine for generating the electric field and machining the workpiece 2 with the electric discharge energy, which is achieved by the machining condition data table 12 storing the machining conditions used from the start of the wire-cut electric discharge machining to the end of the machining. Condition storage means, winding roller control means 13 for controlling the wire winding speed for winding the wire electrode 1, taper angle control means 14 for controlling the inclination angle of the wire electrode 1 with respect to the workpiece 2, and wire electrode reduction. By appropriately operating the switch 24, one or more of the take-up roller control means 13 and the taper angle control means 14 are used to set the processing conditions stored in the processing condition storage means. Zui and controls the wire winding speed may be an embodiment comprising a wire electrode reduction means which is achieved by the NC program execution means 11 to reduce the consumption of the wire electrode 1. Further, by replacing each means in the wire cut electric discharge machine of the present embodiment with the procedure, the wire cut electric discharge machining method can be made an embodiment.

Therefore, the wire electrode reduction switch 24
1 is selected from among winding roller control means 13 for controlling the wire winding speed for winding the wire electrode 1 and taper angle control means 14 for controlling the inclination angle of the wire electrode 1 with respect to the workpiece 2. Using the above, the NC program executing means for achieving the wire electrode reducing means based on the machining conditions used from the start of the wire cut electric discharge machining to the end of the machining stored in the machining condition data table 12 for achieving the machining condition storage means At 11, the wire winding speed is controlled and the consumption of the wire electrode is reduced.

Therefore, the wire-cut electric discharge machine of this embodiment can reduce the consumption of the wire electrode while ensuring a predetermined final machining accuracy.

<Second Embodiment> The overall structure of the wire cut electric discharge machine and the detailed structure of the NC device according to the second embodiment of the present invention are the same as those shown in FIGS. 1 and 2 in the first embodiment. Illustration and description thereof are omitted. In the present embodiment, while the predetermined final machining accuracy is ensured by the program interpretation and execution processing of the NC program execution means 11 of the NC device 10 as described below, the wire electrode is being reduced and the reduction amount is displayed on the display screen of the CRT display 21. Is intended to be displayed. FIG. 5 shows the calculation of the reduction amount of the wire electrode used in the wire cut electric discharge machine according to the second embodiment of the present invention.
It is a flow chart which shows a display routine. The operator installs the workpiece 2, sets the magnetic disk storing the NC program in the magnetic disk reader 23, and then gives an instruction to start the processing. Then, step S21
Then, it is determined whether the wire electrode reduction switch 24 is turned on. If the wire electrode reduction switch 24 is off in step S21, the wire winding speed remains at the preset speed, and this routine ends.

On the other hand, the operator selects the wire electrode reduction switch 1
When 6 is turned on and the determination in step S21 is YES, the process proceeds to step S22, and the reduction amount of the wire electrode consumption amount that can be predicted from the changed wire winding speed and the pre-change wire winding speed is calculated. . Next, the process proceeds to step S23, and the CRT display unit 21 outputs and displays the reduction amount calculated in step S22 and the fact that the wire electrode consumption amount reduction speed is being output. An example of the display screen of the CRT display device 21 is shown in FIG.

As described above, in the wire cut electric discharge machine according to the second embodiment of the present invention, a pulse voltage is applied between the wire electrode 1 and the workpiece 2 to discharge between the electrodes 1 and 2 facing each other. In the wire-cut electric discharge machine for generating the electric field and machining the workpiece 2 with the electric discharge energy, which is achieved by the machining condition data table 12 storing the machining conditions used from the start of the wire-cut electric discharge machining to the end of the machining. Condition storage means, winding roller control means 13 for controlling the wire winding speed for winding the wire electrode 1, taper angle control means 14 for controlling the inclination angle of the wire electrode 1 with respect to the workpiece 2, and wire electrode reduction. By appropriately operating the switch 24, one or more of the take-up roller control means 13 and the taper angle control means 14 are used to set the processing conditions stored in the processing condition storage means. Based on the above, the wire winding speed is controlled to reduce the consumption of the wire electrode 1 by the NC program executing means 11 for reducing the consumption of the wire electrode 1, and the consumption of the wire electrode 1 is reduced by the wire electrode reduction means. When it is in the middle, the embodiment can be provided with the NC program executing means 11 for displaying the reduction in progress display and the reduction amount display and the reduction display means achieved by the CRT display 21.

Therefore, the wire electrode reduction switch 24
1 is selected from among winding roller control means 13 for controlling the wire winding speed for winding the wire electrode 1 and taper angle control means 14 for controlling the inclination angle of the wire electrode 1 with respect to the workpiece 2. Using the above, the NC program executing means for achieving the wire electrode reducing means based on the machining conditions used from the start of the wire cut electric discharge machining to the end of the machining stored in the machining condition data table 12 for achieving the machining condition storage means At 11, the wire winding speed is controlled and the consumption of the wire electrode is reduced. When the consumption of the wire electrode 1 is being reduced, the NC program executing means 11 and the CRT display 21 that achieve the reduction displaying means perform the reduction in progress display and the reduction amount display.

Therefore, the wire-cut electric discharge machine of this embodiment can reduce the consumption of the wire electrode while ensuring a predetermined final machining accuracy, and the operator can easily know the reduction amount of the consumption of the wire electrode. be able to.

<Third Embodiment> Since the entire structure of the wire cut electric discharge machine and the detailed structure of the NC device according to the third embodiment of the present invention are the same as those shown in FIGS. 1 and 2 in the first embodiment described above. Illustration and description thereof are omitted. In the present embodiment, the taper angle of the wire electrode 1 with respect to the workpiece 2 is corrected and controlled by the program interpretation and execution processing of the NC program execution means 11 of the NC device 10 as described below to secure a predetermined final machining accuracy while maintaining a predetermined final machining accuracy. It is intended to reduce the consumption of the electrode 1. FIG. 7 is a flow chart showing a wire winding speed changing / taper angle correcting routine used in the wire cut electric discharge machine according to the third embodiment of the present invention. The workpiece 2 is set by the worker,
After the magnetic disk storing the NC program is set in the magnetic disk reader 23, the start of processing is instructed. Then, in step S31, it is determined whether the wire electrode reduction switch 24 is turned on. Step S3
If the wire electrode reduction switch 24 is turned off at 1, the wire winding speed remains at the preset speed, and this routine ends.

On the other hand, the operator selects the wire electrode reduction switch 1
If 6 is turned on and the determination in step S31 is YES, the process proceeds to step S32, and the combination of the pre-specified machining condition packs used by the machining end stored in the machining condition data table 12 is read. Next, the process proceeds to step S33, and the rule and data as shown in FIG. 4 in which the manufacturer has measured the deterioration of the final machining accuracy in advance, that is, the wire winding speed for each machining condition pack when the predetermined rule is used ( m / min) and the final processing accuracy (μm), the reduction amount of how much the wire winding speed can be reduced for each processing condition pack is calculated. Next, the process proceeds to step S34, and the wire winding speed for each processing condition pack is changed. Then, the process proceeds to step S35, and the offset direction currently being output is determined. This offset direction is a direction determined by the positional relationship between the movement locus of the wire electrode 1 and the machining shape of the workpiece 2, and the wire electrode 1 is machined while maintaining an offset amount with respect to the workpiece 2. . Here, the offset amount is the distance from the center of the wire electrode 1 to the processed shape of the workpiece 2, and is the dimension of the radius of the wire electrode 1 plus the machining allowance. Next, the process proceeds to step S36, and the plate thickness of the workpiece 2 being machined is determined. Then, the process proceeds to step S37, and step S
The direction and amount of the taper angle for tilt correction are calculated based on the preset processing rule from the machining accuracy that is reduced by the rule used in 33, the offset direction determined in step S35, and the plate thickness determined in step S36. To be done. Then, the process proceeds to step S38, and the calculated taper angle is corrected and added to the currently output command value and is output to the taper angle control means 14.

As described above, in the wire-cut electric discharge machine according to the third embodiment of the present invention, a pulse voltage is applied between the wire electrode 1 and the workpiece 2 to discharge between the electrodes 1 and 2 facing each other. In the wire-cut electric discharge machine for generating the electric field and machining the workpiece 2 with the electric discharge energy, which is achieved by the machining condition data table 12 storing the machining conditions used from the start of the wire-cut electric discharge machining to the end of the machining. Condition storage means, winding roller control means 13 for controlling the wire winding speed for winding the wire electrode 1, taper angle control means 14 for controlling the inclination angle of the wire electrode 1 with respect to the workpiece 2, and wire electrode reduction. By appropriately operating the switch 24, one or more of the take-up roller control means 13 and the taper angle control means 14 are used to set the processing conditions stored in the processing condition storage means. Then, the wire winding speed of the wire electrode 1 is controlled by the NC program executing means 11 for controlling the wire winding speed to reduce the consumption of the wire electrode 1, and the wire winding speed of the wire electrode 1 by the wire electrode reducing means. Amount of decrease in final machining accuracy caused by the decrease in workpiece and workpiece 2
The taper angle correction means achieved by the NC program execution means 11 for correcting the taper angle controlled by the taper angle control means in accordance with the plate thickness can be provided as an embodiment.

Therefore, the wire electrode reduction switch 24
1 is selected from among winding roller control means 13 for controlling the wire winding speed for winding the wire electrode 1 and taper angle control means 14 for controlling the inclination angle of the wire electrode 1 with respect to the workpiece 2. Using the above, the NC program executing means for achieving the wire electrode reducing means based on the machining conditions used from the start of the wire cut electric discharge machining to the end of the machining stored in the machining condition data table 12 for achieving the machining condition storage means At 11, the wire winding speed is controlled and the consumption of the wire electrode is reduced. Wire electrode 1
Since the wire electrode consumption increases as the wire winding speed decreases, the NC program execution means 11 that achieves the taper angle correction means corresponds to the reduction amount of the final processing accuracy and the plate thickness of the workpiece 2 and controls the taper angle. The taper angle by means 14 is corrected.

Therefore, the wire-cut electric discharge machine according to the present embodiment can correct the taper angle of the wire electrode with respect to the workpiece to ensure a predetermined final machining accuracy and reduce the consumption of the wire electrode.

[0037]

As described above, according to the wire cut electric discharge machining method of the first aspect, the wire electrode reduction switch is appropriately operated to control the wire winding speed for winding the wire electrode. One or more of the roller control signal and the taper angle control signal for controlling the tilt angle of the wire electrode with respect to the workpiece are used, and the wire is cut based on the stored machining conditions from the start of the wire-cut electric discharge machining to the end of the machining. The winding speed is controlled and the consumption of wire electrodes is reduced. In this way, by operating the wire electrode reduction switch, the wire winding speed of all of the processing condition packs used for processing is changed, so the operator can grasp the amount of decrease in the final processing accuracy and the amount of wire electrode consumption. Can be reduced.

According to the wire-cut electric discharge machine of claim 2, by appropriately operating the wire electrode reduction switch,
One or more of a winding roller control means for controlling a wire winding speed for winding the wire electrode and a taper angle control means for controlling an inclination angle of the wire electrode with respect to a workpiece are used.
The wire winding speed is controlled by the wire electrode reduction means based on the machining conditions stored in the machining condition storage means and used from the start of the wire cut electric discharge to the end of the machining, and the consumption of the wire electrodes is reduced. In this way, by operating the wire electrode reduction switch, the wire winding speed of all of the processing condition packs used for processing is changed, so the operator can grasp the amount of decrease in the final processing accuracy and the amount of wire electrode consumption. Can be reduced.

According to the wire-cut electric discharge machine of claim 3, by appropriately operating the wire electrode reduction switch,
One or more of a winding roller control means for controlling a wire winding speed for winding the wire electrode and a taper angle control means for controlling an inclination angle of the wire electrode with respect to a workpiece are used.
The wire winding speed is controlled by the wire electrode reduction means based on the machining conditions stored in the machining condition storage means and used from the start of the wire cut electric discharge to the end of the machining, and the consumption of the wire electrodes is reduced. When the consumption of the wire electrode is being reduced, the reduction display means displays the reduction in progress and the reduction amount. In this way, by operating the wire electrode reduction switch, the wire winding speed of all of the processing condition packs used for processing is changed, so the operator can grasp the amount of decrease in the final processing accuracy and the amount of wire electrode consumption. Can be reduced. Further, by displaying the wire electrode consumption amount reduction speed output display and the reduction amount display, the worker can easily know that the wire electrode consumption amount is being reduced and the reduction amount.

According to the wire cut electric discharge machine of claim 4, the wire electrode reduction switch is appropriately operated,
One or more of a winding roller control means for controlling a wire winding speed for winding the wire electrode and a taper angle control means for controlling an inclination angle of the wire electrode with respect to a workpiece are used.
The wire winding speed is controlled by the wire electrode reduction means based on the machining conditions stored in the machining condition storage means and used from the start of the wire cut electric discharge to the end of the machining, and the consumption of the wire electrodes is reduced. When the wire winding speed of the wire electrode decreases, the wear of the wire electrode increases. Therefore, the taper angle correction means adjusts the taper angle by the taper angle control means in response to the reduction amount of the final processing accuracy and the plate thickness of the workpiece. It In this way, by operating the wire electrode reduction switch, the wire winding speed of all the processing condition packs used for processing is changed, and further, the taper angle is changed in anticipation of a decrease in processing accuracy due to the change of the wire winding speed. Since the correction is made, it is possible for the operator to reduce the wire electrode consumption while grasping the amount of decrease in the final processing accuracy.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a wire cut electric discharge machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of an NC device in the wire cut electric discharge machine according to the first embodiment of the present invention.

FIG. 3 is a flow chart showing a wire winding speed changing routine which is decoded and executed by NC program executing means of the NC device of the wire cut electric discharge machine according to the first embodiment of the present invention.

FIG. 4 is a table showing wire winding speed and final machining accuracy data for each machining condition pack corresponding to the rule used in the wire cut electric discharge machine according to the first embodiment of the present invention.

FIG. 5 is a flow chart showing a wire electrode reduction amount calculation / display routine which is decoded and executed by the NC program execution means of the NC device of the wire cut electric discharge machine according to the second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a display screen of a CRT display of the wire cut electric discharge machine according to the second embodiment of the present invention.

FIG. 7 is a flowchart showing a wire winding speed changing / taper angle correcting routine which is decoded and executed by the NC program executing means of the NC device of the wire cut electric discharge machine according to the third embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing a conventional wire cut electric discharge machine.

FIG. 9 is a block diagram showing a detailed configuration of an NC device in a conventional wire cut electric discharge machine.

FIG. 10 is an explanatory diagram showing a machining condition pack used in the conventional and the wire-cut electric discharge machines of this embodiment.

FIG. 11 is an explanatory diagram showing a combination of machining condition packs used in the conventional and the wire-cut electric discharge machines of the present embodiment.

[Explanation of symbols]

 1 Wire Electrode 2 Workpiece 5 Winding Roller 10 NC Device 11 NC Program Execution Means 12 Machining Condition Data Table 13 Winding Roller Control Means 14 Taper Angle Control Means 21 CRT Display

Claims (4)

[Claims] 1. A wire-cut electric discharge machine for machining a workpiece by applying a pulse voltage between a wire electrode and the workpiece to generate an electric discharge between poles where the wire electrode and the workpiece face each other. In the method, the machining conditions used from the start of the wire cut electric discharge machining to the end of the machining are stored, the wire winding speed for winding the wire electrode is controlled based on a winding roller control signal, and the wire electrode to be processed is processed. By controlling the tilt angle with respect to the object based on the taper angle control signal and appropriately operating the wire electrode reduction switch, one or more of the take-up roller control signal and the taper angle control signal are used to meet the processing conditions. A wire-cut electric discharge machining method, characterized in that the wire winding speed is controlled on the basis of the wire winding speed to reduce the consumption of the wire electrode. 2. A pulse voltage is applied between the wire electrode and the work piece to generate an electric discharge between the opposing electrodes of the wire electrode and the work piece, and the work piece is processed with the discharge energy. In the wire cut electric discharge machine, a machining condition storage unit that stores machining conditions used from the start of the wire cut electric discharge machining to the end of the machining, and a winding roller control unit that controls a wire winding speed for winding the wire electrode, One of the take-up roller control means and the taper angle control means by appropriately operating the taper angle control means for controlling the inclination angle of the wire electrode with respect to the workpiece and the wire electrode reduction switch.
Using the above, a wire electrode reducing unit that controls the wire winding speed based on the processing conditions stored in the processing condition storage unit and reduces the consumption of the wire electrode is provided. Cut electric discharge machine. 3. A pulse voltage is applied between the wire electrode and the work piece to generate an electric discharge between the opposing electrodes of the wire electrode and the work piece, and the work piece is processed with the discharge energy. In the wire cut electric discharge machine, a machining condition storage unit that stores machining conditions used from the start of the wire cut electric discharge machining to the end of the machining, and a winding roller control unit that controls a wire winding speed for winding the wire electrode, One of the take-up roller control means and the taper angle control means by appropriately operating the taper angle control means for controlling the inclination angle of the wire electrode with respect to the workpiece and the wire electrode reduction switch.
Using the above, a wire electrode reduction unit that controls the wire winding speed based on the processing condition stored in the processing condition storage unit and reduces the consumption of the wire electrode; A wire-cut electric discharge machine comprising: a reduction display means for displaying a reduction-in-progress display and a reduction-amount display when the electrode consumption is being reduced. 4. A pulse voltage is applied between the wire electrode and the work piece to generate an electric discharge between the electrodes where the wire electrode and the work piece face each other, and the work piece is processed by the discharge energy. In the wire cut electric discharge machine, a machining condition storage unit that stores machining conditions used from the start of the wire cut electric discharge machining to the end of the machining, and a winding roller control unit that controls a wire winding speed for winding the wire electrode, One of the take-up roller control means and the taper angle control means by appropriately operating the taper angle control means for controlling the inclination angle of the wire electrode with respect to the workpiece and the wire electrode reduction switch.
Using the above, a wire electrode reduction unit that controls the wire winding speed based on the processing condition stored in the processing condition storage unit and reduces the consumption of the wire electrode; And a taper angle correction means for correcting the taper angle controlled by the taper angle control means in accordance with the reduction amount of the final processing accuracy caused by the reduction of the wire winding speed of the electrode and the plate thickness of the workpiece. A wire-cut electric discharge machine characterized by that.