JP2752550B2 - Wire electrode angle setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle setting device for a wire electrode in a wire cut electric discharge machine, and more particularly to an angle setting device suitable for vertically setting the wire electrode.

[0002]

2. Description of the Related Art In wire-cut electric discharge machining, a predetermined voltage is applied between a wire electrode running in an axial direction and a workpiece placed on an XY table, and a spark generated at that time is applied. This is a processing method for melting or evaporating a workpiece by electric discharge, and its application range has been greatly expanded in recent years, including processing of a mold.

[0003] In such wire cut electric discharge machining, a wire electrode is stretched between a pair of guides.
By moving the guide in the X-Y direction, the wire electrode being processed is controlled to an arbitrary angle, but before processing, it is necessary to keep the wire electrode vertical and to set it at the origin position.

FIG. 5 is a front view showing a conventional example of a vertical device for wire electrodes, and FIG. 6 is a side view thereof. In these figures, reference numeral 1 denotes X provided in a wire cut electric discharge machine.
-Y table, 2 is a wire electrode stretched between a pair of guides 3, 3 provided in the electric discharge machine, 4 is X-
The measuring table is fixed on the Y table 1, and a pair of contacts 5 and 6 are disposed on one side surface of the measuring table 4 at a predetermined interval in the vertical direction.

When measuring the verticality of the wire electrode 2, first, the measuring table 4 is fixed on the XY table 1 using a clamp mechanism. Next, when the wire electrode 2 is run in the axial direction to apply tension to the wire electrode 2 and the inclination of the wire electrode 2 is visually observed in this state,
By moving the head 3 in the XY directions, the wire electrode 2 is set at an angle that is considered vertical. After a while
The XY table 1 is driven to bring the wire electrode 2 into contact with both contacts 5 and 6.

Here, as shown in FIG. 6, when the wire electrode 2 is inclined by an angle θ with respect to the perpendicular, the wire electrode 2 contacts only the upper contact 5, and the wire electrode 2 is turned in the opposite direction. When the electrode 2 is inclined, the wire electrode 2 contacts only the lower contact 6, and only when the wire electrode 2 is vertical, the wire electrode 2 contacts both the contacts 5 and 6 at the same time. Therefore, for example, if the buzzer or the lamp is activated only when the wire electrode 2 comes into contact with both contacts 5 and 6 at the same time, the worker can set the wire electrode 2 vertically by the buzzer and the lamp. If the wire electrode 2 is not vertical, the head 3 is moved in the X-Y direction to correct the inclination of the wire electrode 2, and the above-described operation is repeated to make the wire electrode 2 vertical. Set.

[0007]

However, in the above-described conventional vertical device for a wire electrode, after the approximate verticality of the wire electrode 2 is set by visual observation by an operator, the wire electrode 2 is correctly maintained vertically. Since the determination is made using the measuring table 4 to determine whether or not the wire electrode 2 is leaning, the operator must set the wire electrode 2 vertically by trial and error, and as a result, automation is impossible. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances of the prior art, and has as its object to set a wire electrode angle setting device that can accurately set the angle of a wire electrode before electric discharge machining and that can be automated. Is to provide.

[0009]

In order to achieve the above-mentioned object, the present invention provides a method in which a wire electrode stretched between a pair of guides and a workpiece placed on an XY table. A wire-cut electric discharge machine for generating a spark discharge in the workpiece and processing the workpiece by the spark discharge includes a pair of contacts that can be mounted on the XY table and that are displaced vertically and horizontally. A measuring table, the wire electrode is brought into contact with the two contacts, a calculating means for calculating the inclination of the wire electrode based on the contact position, the guide is driven in the horizontal direction based on the calculated value, And a driving means for correcting the wire electrode to a desired angle.

[0010]

When the XY table is driven, one contact and the other contact are sequentially brought into contact with the wire electrode stretched at a predetermined angle, and the actual angle of the wire electrode from each contact position. Is calculated. If the actual angle deviates from the target set angle of the wire electrode, the guide is driven in the horizontal direction to correct the angle of the wire electrode.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a wire electrode angle setting device according to an embodiment of the present invention, FIG. 2 is a side view of a measuring table provided in the angle setting device, and FIG. 3 is a relationship between the wire electrode and both contacts. FIG. 4 is a flowchart showing a procedure for setting the angle of the wire electrode, and portions corresponding to FIGS. 5 and 6 are denoted by the same reference numerals.

As shown in FIGS. 1 and 2, two V-grooves 4a and 4b extending in the horizontal direction are formed on one side surface of the measuring table 4 at a predetermined interval t in the vertical direction. V
A first contact 7 and a second contact 8 are fixed to the grooves 4a, 4b, respectively. The first and second contacts 7, 8 are both formed in a cylindrical shape, and are displaced in the horizontal direction so as not to overlap with each other. Reference numeral 9 denotes a control program provided in the wire-cut electric discharge machine. The control program 9 includes a coordinate detecting means 10 for detecting a moving amount of the XY table 1 and a wire based on the coordinates detected by the coordinate detecting means 10. Calculation means 11 for calculating the inclination of the electrode 2
And a driving unit 12 for driving the head 3 in the XY directions based on the actual angle obtained by the calculating unit 11 and correcting the wire electrode 2 to a target angle.

Next, referring to FIG. 3 and FIG.
The procedure for setting the angle will be described. First, the measuring table 4 is fixed on the XY table 1 using a clamp mechanism, and the wire electrode 2 is run in the axial direction to apply tension to the wire electrode 2. For example, when the wire electrode 2 is inclined in the direction shown in FIG. 3, by driving the XY table 1, the first electrode as shown in FIG.
The contact 7 is brought into contact with the wire electrode 2, and stores the contacted moment coordinates as X _{1 (S-1).} Next, the first
After the contact 7 is separated from the wire electrode 2 and the measuring table 4 is moved in a direction perpendicular to the plane of FIG. 3, the second contact 8 is brought into contact with the wire electrode 2 as shown in FIG. stores the contacted moment coordinates as X ₂ (S-
2). Here, if the distance in the vertical direction between the two contacts 7 and 8 is set as t, the inclination (actual angle) θ of the wire electrode 2
Is obtained as θ = tan ⁻¹ {(X ₂ −X ₁ ) / t} (S−3). Next, the actual angle θ of the wire electrode 2 thus obtained is compared with the target angle θ ₁ (S-4). If the two do not match, the head 3 is moved by X− by an amount corresponding to the difference. moves in the X-axis direction, to correct the wire electrode 2 at an angle theta ₁ to the target (S-5). Therefore, for example, when it is desired to set the wire electrode 2 vertically, since θ ₁ = 0, the wire electrode 2 may be corrected by θ in a direction opposite to the actual angle θ.

The above procedure is based on the X of the wire electrode 2.
This is the description of setting the angle in the -X direction. By performing the same procedure in the Y-Y direction of the wire electrode 2, the wire electrode 2 is accurately set to the target angle.

As described above, in the above embodiment, the wire electrode 2 can be set at a predetermined angle by the control program 9 provided in the wire cut electric discharge machine.
Automation becomes possible. Further, since the wire electrode 2 can be set not only vertically but also at various angles, it is possible to simplify the setup time of the subsequent electric discharge machining. Furthermore, since both the contacts 7, 8 are cylindrical, wear due to contact with the traveling wire electrode 2 is small, and accuracy can be improved.

[0016]

As described above, according to the present invention,
The actual angle of the wire electrode is determined from the coordinates of the contact of the wire electrode with the pair of contacts, and the wire electrode is corrected to a desired angle based on the actual angle. Settings can be made, and the settings can be automated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a wire electrode angle setting device according to an embodiment of the present invention.

FIG. 2 is a side view of a measuring table provided in the angle setting device of FIG.

FIG. 3 is an explanatory diagram showing a relationship between a wire electrode and both contacts.

FIG. 4 is a flowchart showing a procedure for setting an angle of a wire electrode.

FIG. 5 is a front view showing an apparatus for vertically extending a wire electrode according to a conventional example.

FIG. 6 is a side view of the vertical positioning device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 XY table 2 Wire electrode 3 Head 4 Measuring stand 7 First contact 8 Second contact 9 Control program 10 Coordinate detecting means 11 Computing means 12 Driving means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-232731 (JP, A) JP-A-4-130211 (JP, A) Full-scale operation Sho-59-188125 (JP, U) 51029 (JP, U) Japanese Utility Model Sho 62-176702 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23H 7/06 B23H 7/02 G01B 21/22

Claims (1)

(57) [Claims] 1. A spark discharge is generated between a wire electrode stretched over a pair of guides and a workpiece mounted on an XY table, and the workpiece is processed by the spark discharge. In a wire cut electric discharge machine
A measuring table having a pair of contacts that can be mounted on the XY table and that are displaced in the vertical and horizontal directions; and that the wire electrode is brought into contact with the two contacts, and the wire is connected based on these contact positions. A calculating means for calculating the inclination of the electrode; and a driving means for driving the guide in the horizontal direction based on the calculated value and correcting the wire electrode to a desired angle. Setting device.