JPH04250922A - Wire cut electric discharging device - Google Patents

Abstract

PURPOSE:To improve the work accuracy with the seal resistance to the arm held with an electrode guide being reduced, to reduce the capacity of a work tank without shortening the stroke of the arm and to facilitate the management with the use quantity of a work liquid being reduced, in a wire cut electric discharging device by dipping. CONSTITUTION:An auxiliary tank 34 in a small capacity moved relatively with the above arm 31 to this work tank 33 is arranged at the side part of each main tank 33, and communicated by an aperture part in the state of the space between this auxiliary tank 34 and work tank 33 being sealed slidable by the plate 42 for sealing. And, the above arm 31 is arranged over the work tank 33 from this auxiliary tank 34.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-cut electrical discharge machining apparatus.

0002

[Prior Art] Conventional wire-cut electric discharge machining methods include jet machining, in which machining fluid is injected onto the machining portion of the workpiece, and jet machining, in which the machining portion of the workpiece is immersed in the machining fluid. Immersion machining is used to perform machining, but immersion machining has the advantages of small thermal fluctuations, excellent machining accuracy, and stable machining conditions even when machining end faces and large tapers. It is gradually becoming the mainstream, replacing the traditional jet processing.

By the way, in the above-mentioned immersion processing, processing liquid is stored in a processing tank, and with the workpiece immersed in the processing liquid, the wire is held by a pair of electrode guides arranged above and below the workpiece. Electric discharge machining is performed using electrodes.

[0004] Therefore, in this electric discharge machining apparatus, it is necessary to particularly place the lower electrode guide in the machining fluid and to displace this guide according to the machining position.

[0005] Conventionally, therefore, an apparatus having the structure shown in FIG. 5 or 6 has been provided.

In the apparatus shown in FIG. 5, the arm 1 is inserted into the machining liquid from above the machining tank 2, and the lower guide 3 at the tip is placed at a position deeper than the workpiece 4.

That is, the arm 1 is formed into a crank shape and is suspended downward from the column 5, and the part immersed in the machining liquid is bent in the horizontal direction, and the stroke of the horizontal part 1a causes the tip end to be bent downward. lower guide 3
It has a structure that allows it to be inserted under the workpiece 4.

The column 5 is also provided with a cylinder 7 that holds an upper guide 6, and a wire electrode 8 is guided by the upper and lower guides 3 and 6. Note that a feeding mechanism for the wire electrode 8 and the like are provided within the column 5.

On the other hand, the processing tank 2 is
It is supported above and can be moved horizontally with respect to the column 5.

[0010] Therefore, in this electric discharge machining apparatus,
By moving the machining tank 2 and column 5 relative to each other in the horizontal direction using the Y table 9, a desired machining shape is obtained.

Further, the apparatus shown in FIG.
is inserted through an opening 12a formed in the side wall of the processing tank 12, and the opening 12a is sealed by a sealing mechanism 20. Note that the support structure of the upper guide 16 is the same as that of the device shown in FIG. 5 above.

[0012] Also in this apparatus, the processing tank 12 is
It is supported by an X-Y table 19 and has a structure that moves relative to the column 15 in the horizontal direction. therefore,
The opening 12a has a horizontally elongated shape corresponding to the relative movement range of the arm 11, and the seal mechanism 20 has a structure that allows the arm 11 to move in the X direction and the Y direction.

[0013] Specific examples of this sealing mechanism 20 are disclosed in Japanese Patent Laid-Open No. 64-71625 and Japanese Patent Laid-Open No. 1-321.
There is one disclosed in Publication No. 122.

[0014]

However, in the conventional apparatus shown in FIG. 5, the horizontal portion 1a of the arm 1 is configured to be relatively displaced in the It is necessary to install a processing tank 2 with a large capacity to accommodate the stroke of , and a large amount of processing fluid is used, making it difficult to control the water quality and temperature of the processing fluid, and shortening the life of the water purifier. It has the disadvantage of being short.

[0015] In particular, such a drawback is noticeable in a large machine having a horizontal portion 1a with a large stroke in order to process a large workpiece.

Furthermore, the conventional apparatus shown in FIG. 6 has the drawback that the sealing resistance by the sealing mechanism 20 acts on the relative displacement of the arm 11, which adversely affects the machining accuracy.

The present invention makes it possible to improve machining accuracy by eliminating the adverse effects of seal resistance on the arm in a wire-cut electric discharge machining device using immersion machining, and also to reduce the capacity of the machining tank without shortening the stroke of the arm. The purpose is to facilitate the management of machining fluids and downsize the equipment.

[0018]

[Means for Solving the Problems] The present invention includes a machining tank that stores a machining liquid for dipping a workpiece, an arm that holds a guide for a wire electrode disposed in the machining tank, and a a first support unit that supports the processing tank and is relatively displaced approximately in the front-rear direction with respect to the processing tank;
a second support unit that supports the support unit and is displaceable relative to the processing tank substantially in the left-right direction, and the arm includes a hanging portion extending below the first support unit; and a horizontal part that is bent in a substantially horizontal direction from the bottom and holds the guide at its tip, and this horizontal part is inserted into the processing tank through an opening formed in the side wall of the processing tank. An electrical discharge machining device, the apparatus having an insertion opening through which the horizontal part of the arm is inserted, and arranged along a side wall forming an opening of the machining tank;
a sealing plate that covers the opening; a sealing means that slidably seals between the sealing plate and a side wall forming the opening of the processing tank; The present invention is characterized in that it has an auxiliary tank that is provided integrally with the sealing plate, communicates with the opening of the processing tank through the insertion opening of the plate, and in which the horizontal portion of the arm is arranged.

[0019]

[Embodiment] FIG. 1 is a side sectional view showing the configuration of a wire-cut electrical discharge machining apparatus in a first embodiment of the present invention, and FIG.
2 is a simplified cross-sectional plan view of the structure taken along line A-A in FIG. 1. FIG.

In this electric discharge machining apparatus, a column 30 as a second support unit is fixedly installed on a floor (not shown), and a first
A slide unit 32 that supports an arm 31 and the like as a support unit, a machining tank 33 in which a workpiece 40 is immersed in a machining liquid, and an auxiliary tank 34 that communicates with this machining tank 33 are attached.

The slide unit 32 is installed on the upper part of the column 30 via a slide rail 35, and is supported so as to be slidable in the direction of moving the arm 31 back and forth with respect to the processing tank 33, that is, in the Y-axis direction in the figure. and,
Movement in the Y-axis direction is controlled by a servo control mechanism (not shown).

The slide unit 32 is provided with the arm 31 holding the lower guide 36, the cylinder 38 holding the upper guide 37, a feeding mechanism for the wire electrode 39, and the like.

[0023] The arm 31 is formed in a crank shape,
A vertical portion 31b that hangs downward from the column 30, and a horizontal portion 3 that is bent horizontally from the lower end of the vertical portion 31b and is immersed in the machining fluid in each of the tanks 33 and 34.
1a, and a lower guide 3 at the tip of this horizontal portion 31a.
Holds 6. Note that the wire electrode 39 is connected to the arm 3
1 and is guided into the slide unit 32.

The processing tank 33 is installed in the middle part of the column 30 via a slide rail 41, and is supported so as to be slidable in the left-right direction with respect to the arm 31, that is, in the X-axis direction shown in FIG. The movement in the X-axis direction is controlled by a servo control mechanism (not shown).

This processing tank 33 is arranged side by side with the auxiliary tank 34, and the side wall 3 facing the auxiliary tank 34 is
3b, an opening 3 into which the horizontal part 31a of the arm 31 is inserted.
3a is formed. This opening 33a is located in the arm 3.
It is formed into a longitudinal shape corresponding to the movement range of 1 in the X-axis direction.

The auxiliary tank 34 is fixed to the middle part of the column 30. This auxiliary tank 34 is the processing tank 3
3, the width is narrower in the X-axis direction than the horizontal part 31 of the arm 31.
It has a small capacity and is large enough to accommodate a.

An opening 34a for passing the horizontal portion 31a of the arm 31 into the processing tank 33 is formed in the side wall 34b of the auxiliary tank 34 facing the processing tank 33. A sealing plate 42 for sealing the opening 33a of the tank 33 is integrally provided. This plate 42 covers the entire range of relative movement between the auxiliary tank 34 and the processing tank 33, and the opening 3
3a, and has an insertion opening 42a approximately in the center through which the horizontal portion 31a of the arm 31 is passed.
is formed. This sealing plate 42 is secured to a seal 44 by a presser piece 43 provided on the processing tank 33 side.
45 is pressed against the side wall 33b of the processing tank 33, and the opening 33a is sealed in a state where the auxiliary tank 34 and the processing tank 33 are movable relative to each other.

In the above configuration, the arm 31 and the auxiliary tank 34 are fixed in the X-axis direction, and the processing tank 33 side is movable. Also, in the Y-axis direction,
The processing tank 33 and the auxiliary tank 34 are fixed, and the arm 31 moves relative to these tanks 33 and 34.

The horizontal portion 31a of the arm 31 is arranged from the auxiliary tank 34 to the processing tank 33,
In addition to being able to obtain a sufficient stroke, since the auxiliary tank 34 has a small capacity, the amount of machining fluid used can be reduced accordingly.Furthermore, since the structure does not apply seal resistance directly to the arm 31, machining accuracy is improved. can be achieved.

Next, FIG. 3 is a side sectional view showing the configuration of a wire-cut electric discharge machining apparatus according to a second embodiment of the present invention, and FIG. 4 is a simplified view of the structure taken along the line B--B in FIG. FIG.

[0031] Components similar to those of the first embodiment described above are given the same reference numerals, and explanations thereof will be omitted.

In this embodiment, a pipe 46 for passing the wire electrode 39 is provided continuously from the horizontal portion 31a of the arm 31, and this pipe 46 is made to protrude outside from a discharge hole 47 provided in the auxiliary tank 34. The wire electrode 39 is configured to be discharged to the outside. Further, a seal 48 is provided in the discharge hole 47 so that the pipe 46 can freely slide in the Y-axis direction.

[0033] In this electric discharge machining apparatus, the seal resistance in the X-axis direction, which has a particularly negative effect on machining accuracy, is
It does not act directly on the arm 31, and also in the Y-axis direction, since a seal is formed between the pipe 46 extending toward the base end of the horizontal portion 31a of the arm 31 and the auxiliary tank 34, the tip of the horizontal portion 31a It will have almost no effect on the side. Therefore, by reducing seal resistance, it is possible to improve processing accuracy.

In the above embodiments, the openings 33a, 34a and the insertion opening 42a are formed in a closed shape, but instead, they may be formed in an upwardly open shape as long as the strength allows. It may be provided.

Furthermore, in the above embodiment, the auxiliary tank 34 is fixed, and the arm 31 moves in the Y-axis direction.
Although the processing tank 33 was configured to move in the X-axis direction,
The relative movement of each unit may be obtained in the opposite relationship.

[0036]

[Effects of the Invention] According to the present invention, since an auxiliary tank is provided in which the arm can be placed in communication with the processing tank, the structure is such that no direct sealing resistance is applied when the arm is placed in the tank. This makes it possible to eliminate the adverse effects of seal resistance and improve machining accuracy.

Furthermore, since the arm is arranged from the auxiliary tank to the machining tank, it is easy to increase the stroke of the arm, and by providing the auxiliary tank, it is possible to increase the size of the main machining tank itself. In comparison, the overall tank capacity can be reduced and the amount of machining fluid used can be reduced, making it easier to manage the machining fluid and extending the life of the water purifier. The device can be made smaller and lighter. Furthermore, since the processing tank is lightweight, it has the effect of reducing the burden on supporting mechanisms such as the X-Y table.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the configuration of a wire-cut electrical discharge machining apparatus in a first embodiment of the present invention.

FIG. 2 is a simplified cross-sectional plan view of the structure taken along line AA in FIG. 1;

FIG. 3 is a side cross-sectional view showing the configuration of a wire-cut electrical discharge machining apparatus in a second embodiment of the present invention.

4 is a simplified cross-sectional plan view of the structure taken along line BB in FIG. 3; FIG.

FIG. 5 is a side cross-sectional view showing the first prior art.

FIG. 6 is a side sectional view showing a second prior art.

[Explanation of symbols]

30...Column, 31...Arm, 31a...Horizontal part, 32...Slide unit, 33...processing tank, 33a, 34a...openings, 34... Auxiliary tank, 36, 37...Guide, 38...Cylinder, 39...Wire electrode, 42...Sealing plate, 42a...insertion opening part, 43...presser piece, 44, 45, 48...Seal, 46...Pipe.

Claims (1)

[Claims] Claim 1: A machining tank that stores a machining liquid for dipping a workpiece, an arm that holds a guide for a wire electrode disposed within the machining tank, and an arm that supports the arm and is connected to the machining tank. a first support unit that is relatively displaced substantially in the front-back direction;
a second support unit that is relatively displaced substantially in the left-right direction with respect to the processing tank; the arm has a hanging portion extending below the first support unit; A wire-cut electric discharge machining device comprising a horizontal part that is bent and holds the guide at its tip, and the horizontal part is inserted into the machining tank through an opening formed in a side wall of the machining tank. , a sealing plate having an insertion opening for passing through the horizontal part of the arm, and disposed along a side wall forming an opening of the processing tank, and covering the opening; the sealing plate and the processing tank; a sealing means for slidably sealing between the opening and the side wall formed with the opening; held by the second support unit and provided integrally with the sealing plate, through the insertion opening of the plate; A wire-cut electric discharge machining apparatus, comprising: an auxiliary tank that communicates with the opening of the machining tank and in which the horizontal portion of the arm is arranged.