JP2684392B2 - Wire electrode supply confirmation method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wire electrode in a wire electric discharge machine for generating an electric discharge between a traveling wire electrode and a workpiece and performing electric discharge machining of the workpiece with discharge energy. Regarding supply confirmation method.

[Conventional technology]

Generally, in the wire electric discharge machining method, the workpiece is currently machined by using a portion where the wire electrode travels in the vertical direction, in other words, in the vertical direction. The wire electrode is guided by various rollers of a wire traveling system attached to the wire electric discharge machine main body side and supplied to a wire head having a wire guide.

On the other hand, the table on which the workpiece is attached moves in the X-axis direction and the Y-axis direction according to the machining status of the workpiece in response to a command from the NC unit, and has a servo function with the wire electrode supplied to the wire head. By repeating the above, electric discharge machining of the workpiece is in progress. In other words, the wire electrode not only moves relatively in the machining direction during wire electric discharge machining, but when electric discharge machining becomes unstable depending on the conditions such as machining scraps, the machining path is instantaneously removed to eliminate the short circuit. The workpiece is also moved backward along the workpiece relative to the workpiece, and then moved forward again to perform wire electric discharge machining. And, after receiving a command from the NC device,
The workpiece is moved in the horizontal direction, that is, the X-axis direction and the Y-axis direction, the movements of both are combined, and the workpiece is wire-discharge machined into a predetermined machining shape by the relative movement of the two.

By the way, in the wire electric discharge machine, as a method of confirming the wire supply of the wire electrode, conventionally, a method of confirming the wire supply detected by using a timer incorporated in the automatic wire feeder or a method of checking the wire electrode by the automatic wire feeder is used. There was a method of confirming the wire supply to detect the feeding amount.

Further, as a wire breakage detection method in an automatic wire supply device, a method of mechanically detecting the tension of a wire electrode running on a roller and using a limit switch or the like has been adopted. For example, as shown in FIG. 4, the wire electrode 1 is run on a roller 22, and a detection sensor such as a limit switch 23 is connected to the end of a contact rod 29 fixed to the roller 22 so that the wire 22 is moved by the roller 22. A method is adopted in which the electrode 1 is biased to apply a tension T, and the tension T applied to the wire electrode 1 is used to mechanically detect the disconnection state of the wire electrode 1 using a limit switch 23 or the like. There is.

Japanese Patent Publication No. 62-16771 discloses a wire breakage detecting device as shown in FIG. The wire breakage detecting device supports the contact rod 24 at a fulcrum 26, urges one end of the contact rod 24 toward a limit switch 25 side by a spring 27, and brings the other end into contact with the wire electrode 1 so as to contact the wire electrode 1.
Tension T is applied to. When the wire electrode 1 is broken in such a state, the terminal 27 at the end of the contact rod 24 turns on the limit switch 25 by the spring 27.

[Problems to be solved by the invention]

However, in a wire electric discharge machine, a wire electrode supply confirmation method that uses a timer or checks the wire supply state by detecting the feed amount into the wire electrode does not directly detect the wire supply state, It was difficult to accurately and accurately confirm the supply state such as the completion of the supply of the wire electrode.

Further, as shown in FIG. 4, the tension T applied to the wire electrode 1 is detected by using detection sensors such as the roller 22, the contact rod 29, and the limit switch 23. This is because the tension is applied to No. 1 and does not detect the supply state of the wire electrode 1 by detecting the rotation number of the roller 22, but the roller 22 mechanically detects the disconnection state of the wire electrode 1 It is applied to the device.

Further, the one disclosed in Japanese Patent Publication No. 62-16771 mentioned above also detects the disconnection state of the wire electrode in the same manner as described above.

An object of the present invention is to solve the above-mentioned problems, and when a machining gap is applied to a workpiece by applying a voltage between the wire electrode and the workpiece, the wire electrode is discharged by an automatic wire feeder. In order to detect whether or not the wire electrode has already been supplied to the processed part, the wire electrode is not rotated by applying unnecessary tension to the wire electrode and without changing the tension of the wire electrode, through the rotation of the roller that guides the wire electrode. To easily detect the feed rate of
In order to achieve a wire electric discharge machining method that can surely and accurately detect and confirm the supply state of the wire electrode, for example, the time when the supply is completed, and can immediately and smoothly perform the machining process of the subsequent wire electric discharge machining. It is to provide a method of confirming the wire electrode supply.

[Means for solving the problem]

The present invention is configured as follows to achieve the above object. That is, according to the present invention, the wire electrode is applied by a rotation detector arranged in a wire traveling system in a wire electric discharge machine that applies an inter-electrode voltage from a machining power source between the wire electrode and the workpiece to discharge the workpiece. The rotation speed detected by the rotation detector is detected according to the traveling speed of the wire electrode, and the rotation speed detected by the rotation detector is adjusted in accordance with the traveling speed of the wire electrode, which is input in advance, when the wire supply is completed and after the wire supply is completed. The present invention relates to a wire electrode supply confirmation method, characterized by confirming the wire supply state of the wire electrode in the wire traveling system by making a comparison judgment with each rotation speed.

[Action]

The wire electrode supply confirmation method according to the present invention is configured as described above and operates as follows. That is, this wire electrode supply confirmation method detects the number of rotations by a rotation detector installed in the wire electrode traveling system via a roller arranged in the wire electrode traveling system for guiding the wire electrode, Compared with the number of revolutions at the time of a predetermined state, by detecting and confirming the supply state of the wire electrode, it is possible to directly detect the change in the traveling speed of the wire electrode,
The supply state of the wire electrode can be surely and instantaneously detected and confirmed, and the process can be smoothly shifted to the subsequent wire electric discharge machining step. Therefore, according to this wire electrode supply confirmation method, it is possible to perform the wire electric discharge machining while improving the automation of the wire electrode supply.

〔Example〕

An embodiment of a wire electric discharge machine capable of achieving the wire electrode supply confirmation method according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a wire electric discharge machine capable of achieving a wire electrode supply confirmation method according to the present invention, FIG. 2 is an enlarged front view showing a wire traveling system of a supply head portion of FIG. 1, and FIG. It is a perspective view showing a supply head part for explaining a wire electrode supply confirmation method by this invention.

This wire electric discharge machine is a machine for electric discharge machining a work piece by applying a machining gap voltage between a wire electrode 1 and a work piece by a machining power source. Generally, the work piece is installed on a cross slide, The cross slide is configured to be movable in the horizontal direction. The cross slide on which the workpiece is attached moves in the X-axis direction and the Y-axis direction according to the machining status of the workpiece in response to a command from the NC device, and between the wire electrode 1 supplied to the upper wire head 5. The servo feed mechanism driven by the servo motor repeatedly advances the servo movement, and the workpiece is electric-discharge machined into a predetermined machining shape by the relative movement in which the movements of both are combined.

Further, the wire electric discharge machine has a wire traveling system including various rollers for guiding the wire electrode 1. Further, wire heads 5 and 6 are provided above and below the workpiece, and these wire heads 5 and 6 have a power supply, a power supply holding member, a die guide member, a machining liquid jet nozzle, and the like.

The automatic wire feeder in this wire electric discharge machine enables the unattended machining operation of the wire electric discharge machine smoothly, but it can automatically re-connect the wire breakage during machining, and it can be used for wire feeding. Even if it fails, it has a retry function, and it is possible to achieve wire connection by repeatedly conducting wire passing tries. On the machine frame 11, a source bobbin 2 around which various wire electrodes 1 are wound is arranged.

The wire electrode 1 sent from the source bobbin 2 passes through a plurality of direction changing rollers 3 in the wire traveling system, and a tension roller 4 attached to a head support frame 19.
Sent to. The wire electrode 1 is a tension roller 4
Gives the optimum tension. The wire traveling system downstream of the tension roller 4 is also provided with a plurality of direction changing rollers 3 and a felt brake roller 12.

Further, a wire breakage detection sensor 9 for the wire electrode 1 is provided between the direction changing rollers 3 in the wire traveling system downstream of the tension roller 4, and is configured to detect the wire breakage of the wire electrode 1 being supplied. . The wire electrode 1 is composed of these direction changing rollers 3 and felt brake rollers.
It is fed through 12 to the wire feeding head 10 provided with the head 20.

The wire supply head 10 is provided with a thread guide 13, a pipe holder 14, and a supply pipe 15. The wire electrode 1 is sent to the upper wire head 5 through the thread guide 13, the pipe holder 14, and the supply pipe 15 sequentially. The work piece is set between the upper wire head 5 and the lower wire head 6 attached to the lower arm 7, but the wire electrode 1 passes through a die guide member installed in the inner cylinder of the upper wire head 5. Electrical discharge machining of the workpiece,
The wire electrode 1 consumed by the electric discharge machining is discharged to a take-up reel, a used wire pool portion, etc. through a die guide member installed in the inner cylinder of the lower wire head 6 and a roller.

In the figure, reference numeral 8 indicates an automatic wire supply control device, and the automatic wire supply control device 8 has a function of automatically supplying a wire as an electrode from an upper guide of an upper wire head to a lower guide of a lower wire head. Have.

The wire electric discharge machine is configured as described above, but in order to achieve the wire electrode supply confirmation method according to the present invention, the wire electric discharge machine is configured as shown in FIG.

A rotation detector 16 is provided for the direction changing roller 3 located at the final stage of the head 20. Rotation detector
Reference numeral 16 is one capable of detecting the traveling speed of the wire electrode 1, and the detection signal of the rotation detector 16 is a pulse shaper.
The signal input to 17 and shaped by the pulse shaper 17 is input to the rotation speed discrimination circuit 18, and then to the CPU controller 21.

The CPU control device 21 is preliminarily input with each rotation speed corresponding to, ie, corresponding to each traveling speed of the wire when the wire is supplied, when the wire is supplied, and after the wire is supplied. Therefore,
In the CPU controller 21, the number of revolutions corresponding to the traveling speed of the wire electrode 1 detected by the rotation detector 16,
At the time of wire supply, when the wire supply is completed and after the wire supply is completed, the current traveling speed of the wire electrode 1 is compared with respective rotating speeds corresponding to the traveling speeds of the wire. to decide. That is, during the operation of supplying the wire electrode 1 to the electric discharge machining portion, a sequential change in the traveling speed of the wire electrode 1 is directly and instantaneously detected to detect the wire supply state of the wire electrode 1. Electrode 1
It is possible to confirm the wire supply completion state of.

〔The invention's effect〕

The wire electrode supply confirmation method according to the present invention is configured as described above and has the following effects. That is,
By configuring the wire electrode supply confirmation method as described above, the rotation detector can instantly directly and sequentially detect a change in the traveling speed of the wire electrode. In addition, since the traveling speed of the wire electrode is compared with each rotation speed corresponding to each traveling speed of the wire electrode which is input in advance, when the wire supply is completed, and when the wire supply is completed, It is possible to immediately and surely detect the change in speed in any supply state.

That is, in this wire electrode supply confirmation method, it is possible to directly detect the supply traveling state of the wire electrode to the electric discharge machining portion by the rotation detector, for example, when the wire supply of the wire electrode to the electric discharge machining portion is completed. Can be instantly detected, and the next wire electric discharge machining process can be smoothly transitioned to immediately.

Moreover, since this wire electrode supply confirmation method uses the existing direction changing roller to detect the traveling speed of the wire electrode from the rotation speed of the roller, it can be easily detected without increasing the number of parts so much. Means can be incorporated, the manufacturing cost is low, there is no need to apply extra tension to the wire electrode, the friction between the wire electrode and the detection means is small, and the wire electrode is disconnected due to friction or the like. There is no such thing.

[Brief description of the drawings]

FIG. 1 is a front view showing a wire electric discharge machine capable of achieving a wire electrode supply confirmation method according to the present invention, and FIG. 2 is an enlarged front view showing a wire traveling system of a supply head portion in FIG.
FIG. 4 is a perspective view showing a supply head portion for explaining a wire electrode supply confirmation method according to the present invention, FIG. 4 is an explanatory view showing an example of a relation between a conventional wire disconnection detecting device and a wire electrode, and FIG. FIG. 6 is an explanatory view showing another example of the relationship between the conventional wire breakage detection device and the wire electrode. 1 ... Wire electrode, 2 ... Source bobbin, 3 ... Direction changing roller, 4 ... Tension roller, 16 ... Rotation detector, 17 ... Pulse shaper, 18 ... Rotation speed discrimination circuit, 21 ...
… CPU controller.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-64230 (JP, A) SAI-KAI 62-198022 (JP, U)

Claims (1)

(57) [Claims] 1. A rotation detector disposed in a wire traveling system of a wire electric discharge machine that applies a machining gap voltage between a wire electrode and a workpiece by a machining power source to discharge the workpiece by a rotation detector. Detects the number of revolutions according to the running speed,
The number of revolutions detected by the rotation detector is compared with the number of revolutions corresponding to each traveling speed of the wire electrode which is input in advance, at the time of wire supply, at the time of completion of wire supply and after completion of wire supply, and the wire traveling is performed. A wire electrode supply confirmation method characterized by confirming a wire supply state of the wire electrode in a system.