JPH067864Y2 - 4-axis control wire cut electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a four-axis control wire cut electric discharge machine, and more particularly to a four axis controlled wire cut electric discharge machine having an improved electrode guide support moving mechanism.

[Conventional technology]

The wire-cut electric discharge machine does not need to manufacture an electrode corresponding to the machining shape each time it is machined, unlike the ordinary electric discharge machine, and it is possible to operate for a long time unattended with the development of the numerical control device (NC device). For some reason, it is now widely used.

In recent years, wire-cut electric discharge machining has undergone many improvements so that high-speed and high-precision machining can be performed. However, in order to expand its application, machining with a taper angle larger than ever is required. What is possible is desired.

Conventionally, as a UV guide bearing in a taper machining mechanism, a cross roller guide or a cross ball guide system,
Alternatively, a linear ball guide is used. The former two are not expensive, and overhangs of half the table stroke (LS) occur at both ends of the table, which is directly loaded, and the stroke is required to maintain accuracy. There is a problem that it cannot be taken very large. On the other hand, the latter is inexpensive in terms of price, but has a problem that the guide bar is bent due to a suspension load and high-precision guidance is very difficult because preload cannot be removed.

[Problems to be solved by the invention]

The present invention has been made to solve the above problems. The purpose of the present invention is to make a large taper angle so that a large stroke in the UV axis direction can be obtained, and at a low price and a high price. It is an object of the present invention to provide a four-axis control wire-cut electric discharge machine equipped with a moving mechanism for an electrode guide support for taper machining, which can be accurately and compactly constructed.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a four-axis control wire-cut electric discharge machine comprising a stage which can be controlled in XY biaxial directions and an electrode guide support which can be controlled in UV biaxial directions. In this structure, the electrode guide support is configured to be movable by a double-row angular bearing for infinite linear motion. The electrode guide support having electrode guides is continuously held in a substantially flat plate shape and has a rectangular U shape in a horizontal plane direction. An axial movement table, a V-axis direction movement table positioned so as to overlap with the upper portion of the U-axis direction movement table, and a stem that hangs vertically from an upper arm so as to overlap with the upper portion of the V-axis direction movement table. And a fixed table attached to the tip of the V-axis direction moving table, and a U-axis direction drive motor and a U-axis direction drive motor provided at one end side of the V-axis direction moving table and substantially in the center in the V-axis direction perpendicular to the U-axis And a feed screw and a female screw member that extend in the U-axis direction at the central portion, and are connected to the V-axis direction moving table so as to be feed-movable by the U-axis direction rotating table by rotational driving by the motor. A U-axis drive feed device, a V-axis direction drive motor provided on one end side of the U-axis direction moving table or the fixed table, and substantially at the center in the U-axis direction perpendicular to the V-axis, and A V-axis drive feeding device that extends in the V-axis direction at the central portion and is composed of a feed screw and a female screw member that are coupled by a rotational drive by the motor so as to feed and move the V-axis direction moving table to a fixed table. And the U-axis and V-axis direction moving tables on both ends in the V-axis direction perpendicular to the U-axis extend in parallel to the U-axis direction and can make relative movement in the U-axis direction by making contact with each other substantially in the V-axis direction. To guide to U-axis movement guide device composed of each pair of guide bars and double-row angular bearings for infinite linear movement, V-axis direction movement tables at both ends in the U-axis direction perpendicular to the V-axis, and fixed A pair of guide bars fixed to the table so as to extend parallel to the V-axis direction and fixedly contact each other in the U-axis direction so as to be relatively movable in the V-axis direction and an infinite linear motion compound bar. And a V-axis movement guide device including a row angular bearing.

[Action]

With the above configuration, it is possible to continuously install one or more double row angular bearings for infinite linear motion to both ends of one table, and the guide bar attached to the other table is Since the bearings arranged in two rows of angular bearings move in such a way that they mesh with each other, there is no excessive overhang at both ends of the table, and the guide bar is always supported by a large number of bearing balls. A drive feed for each U-axis and V-axis direction moving table is provided on the guide bar in the axial direction at the central portion perpendicular to each axial direction, that is, between the bearings arranged in the two rows. Since the bearing is moved in the guide direction, the movement is smoothly performed while maintaining the equilibrium state, and easily maintains high accuracy. Further, since the double row angular bearing for infinite linear motion is relatively inexpensive, it is possible to provide a moving mechanism for the taper machining electrode guide support which is more inexpensive and more accurate than the conventional one. An axis control wire cut electric discharge machine can be provided.

〔Example〕

Hereinafter, the details of the configuration of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a general view showing an outline of an embodiment of a wire cut electric discharge machine according to the present invention, and FIG. 2 is a moving mechanism portion of an electrode guide support in the wire cut electric discharge machine shown in FIG. FIG. 3 is an enlarged sectional view of an essential part, FIG. 3 is a top view taken along line III-III in FIG. 2, and FIG. 4 is an external perspective view of a double-row angular bearing for infinite linear motion provided in the moving mechanism of the electrode guide support. 5 and 5 are sectional views perpendicular to the axis showing the function of the double row angular bearing for infinite linear motion.

Thus, in FIG. 1 showing the outline of one embodiment of the wire cut electric discharge machining apparatus according to the present invention, 1 is a column, 2 is an upper arm extending from the column 1, 3 is a lower arm, 4 is a wire electrode. Reference numeral 5 is a wire electrode supply drum, 6 is a wire electrode recovery drum, 7 is a stem which is vertically hung and attached to the upper arm, 8 is an electrode guide support body to which an electrode guide body 9 is attached, and 10 is the electrode guide body. Electrode guide support body moving mechanism for supporting the support body 8 so as to be movable in the UV axis direction, 11 is an electrode guide provided on the lower arm 3 side, 12 is a workpiece, and 13 is a mount for fixing the workpiece 12. Stand, 14 is the above stand
A cross slide table for supporting 13 so as to be movable in the X-axis (left-right direction in the drawing) and Y-axis direction (direction perpendicular to the plane of the drawing), and showing the details of the electrode guide support moving mechanism 10. In FIGS. 2 and 3, 21 is a fixed table fixed to the lower end of the stem 7 via an appropriate mounting base 7 ', and 22 is the V axis direction with respect to the fixed table 21 (with respect to the plane of the drawing). The V-axis direction moving table is movably supported in the right angle direction, and U is movably supported in the U-axis direction (left and right direction in the drawing) with respect to the V-axis direction moving table.
Axial movement tables 24 and 25 are mounted on the upper surface of the V-axis movement table 22 to support the above-mentioned V-axis movement table 22 so as to be movable in the V-axis direction with respect to the fixed table 21. The row angular contact bearings, 26 and 27 are guide bars fixed to the fixed table 21 side so that they slide on the bearing balls of the angular contact bearings 24 and 25 (see FIG. 3). The V-axis direction moving table is attached to one end side of the axial-direction moving table 22 (or the fixed table 21) substantially at the center in the U-axis direction perpendicular to the V-axis, and the V-axis direction moving table is FV with respect to the fixed table 21. A V-axis direction driving motor for driving in the axial direction, 29 is a worm gear attached to the rotating shaft of the motor 28, and 30 is the V-axis direction moving table 22 by the rotation of the motor 28. A shaft with a feed screw rotatably supported on the V-axis direction moving table 22 so as to move in the axial direction, 31 is a worm wheel fixed to the shaft 30 and meshed with the worm gear 29, and 32 is the fixed table. A female screw member that is housed and fixed in the 21 and that meshes with the male screw portion of the feed screw shaft 30;
33 and 34 are limit switches mounted on the V-axis direction moving table 22 and 35 and 36 are mounted on the side surfaces of the fixed moving table 21.
Limit switch actuating contact members that actuate 34 to define the range of movement of the V-axis direction moving table 22, 37
Is the above-mentioned U-axis direction moving table 23 and V-axis direction moving table
A double-row angular bearing for infinite linear motion mounted on the lower surface of the V-axis direction moving table 22 for movably supporting the U-axis direction with respect to 22, and 38 is one end side of the V-axis direction moving table 22. And the above-mentioned U-axis direction moving table is attached to a substantially central portion in the V-axis direction perpendicular to the U-axis.
A U-axis direction drive motor for driving 23 in the U-axis direction with respect to the V-axis direction moving table 22, 39 is a worm gear attached to the rotary shaft of the motor 38, and 40 is the U-axis by the rotation of the motor 38. A shaft with a feed screw rotatably supported on the V-axis direction moving table 22 so as to move the direction moving table 23 in the U-axis direction, 41 is a worm wheel fixed to the shaft 40 and meshed with the worm gear 39, 42 is a rotary bearing that rotatably supports the feed screw shaft 40, 43 is a female screw member that is housed and fixed in the U-axis direction moving table 23 and meshes with the male screw portion 40a of the feed screw shaft 40, Reference numeral 44 denotes a fixing screw for fixing the female screw member 43 in the U-axis direction moving table 23, and 45 (see FIG. 3) moves the wire electrode 4 supplied from the wire electrode supply drum 5 in the U-axis direction. The wire electrode guide pulley is attached to a position extended from the side surface of the V-axis direction moving table 22 for guiding to the electrode guide 9 on the wire electrode guide support 8 attached to the lower surface of the table 23.

Thus, in the wire-cut electric discharge machine shown in FIG. 1, the wire electrode 4 pulled out from the wire electrode supply drum 5 is guided to the upper electrode guide 9 through a predetermined guide roller or the like, and the upper electrode Electrode guide 9 and lower electrode guide 11
The wire electrode is stretched in a straight line between them, and the wire electrode is opposed to the object to be processed 12 with a minute gap therebetween for electric discharge machining, and the used wire electrode is wound around the electrode collecting drum 6. Has become.

For the workpiece 12 mounted on the stage 13, XY
The axial cross slide table 14 is driven based on a command from a numerical control device or the like (not shown in the figure), and machining feed along the XY biaxial directions is given.

On the other hand, the upper electrode guide 9 is the electrode guide support moving mechanism 10
Is configured so that it can be moved in the UV biaxial direction by operating, and the tension angle of the wire electrode stretched between the lower electrode guide 11 and the lower electrode guide 11 can be changed. As a result, the object 12 to be processed is subjected to desired taper processing.

Thus, the electrode guide support 8 has not only the electrode guide 9 for accurately positioning the wire electrode in the processed portion, but also a working liquid supply nozzle or a wire between the wire electrode and the workpiece. Since a current-carrying mechanism for applying a discharge voltage and an ultrasonic oscillating device for imparting ultrasonic vibrations to the wire electrode in order to improve the processing speed, etc. are attached, its weight becomes considerable, and therefore the electrode guide The support moving mechanism 10 must be structurally rigid.

However, as a bearing mechanism for movably supporting the V-axis and U-axis direction moving table, which is a main part of the electrode guide support moving mechanism in each direction, a cross roller guide, a cross ball guide, a linear ball has been conventionally used. Since a guide or the like was used, there were problems that sufficient machining accuracy could not be obtained as described above, and the apparatus itself was expensive.

On the other hand, the wire-cut electric discharge machine according to the present invention uses the double-row angular bearings 24, 25, 27 for infinite linear motion as a support mechanism for each table in the electrode guide support moving mechanism. Therefore, the above problem is solved.

That is, as shown in FIG. 2, the V-axis direction moving table 22 has a double row angular bearings 24 and 25 for infinite linear motion with respect to the fixed table 21, and a guide bar 26 for them.
And 27, and is driven in the V-axis direction by a lead screw shaft 30 which is rotated by a motor 28. On the other hand, the U-axis direction moving table 23 has a double-row angular bearing 37 for infinite linear movement with respect to the V-axis direction moving table 22 (opposite to this, a similar double-row angular bearing for infinite linear movement is also provided on the front side. Although it is provided, it is not visible in the figure because it is on the front side of the cut surface in FIG. 2) and supported by the motor 38.
It is adapted to be driven in the U-axis direction by a shaft 40 with a feed screw which is rotated by.

A shaft 40 with a feed screw for driving the U-axis direction moving table 23 is rotatably supported on the V-axis direction moving table 22 by a rotary bearing 42, and a worm wheel 41 attached to one end of the shaft 40 rotates the motor 38. The worm gear 39 attached to the shaft causes the worm gear 39 to rotate in both forward and reverse directions, which causes the U-axis direction moving table 23 to move in the U-axis direction (second direction) via a female screw member 43 fixed therein. It can be moved to the left and right in the figure). The female screw member 43 is formed with a female screw portion 43a that meshes with the male screw portion 40a of the feed screw shaft 40 in the middle thereof, and a cavity portion to the right of which a feed screw shaft 40 can enter. 43b is formed, and further the female screw member 4 is formed.
The whole 3 is inserted into a hole formed in the V-axis direction moving table 23 and fixed to the V-axis direction moving table by a fixing screw 44.

The configuration of the drive mechanism in the V-axis direction including the motor 28 for moving the V-axis direction moving table 22 with respect to the fixed table 21, the worm gear 29, the feed screw shaft 30, the worm wheel 31, the female screw member 32 and the like is also the above. Is the same as.

Thus, the fixed table 21 and the V-axis direction moving table 2
2, the structure and function of the double row angular bearings 24, 25, 37 for infinite linear motion connecting the V-axis direction moving table 22 and the U-axis direction moving table 23, respectively, and the functions thereof are shown in FIG. Will be described with reference to FIGS. 4 and 5. The other angular bearings have the same structure.

The double-row angular bearing 25 for infinite linear movement has a large number of bearing balls 25a, 25a, 25b, and 25b as an appropriate holder member 2.
5c, 25d, and 25e are rotatably sandwiched between them, and one group of bearing balls 25a, 25a and the other group of bearing balls 25b, 25b circulate in mutually parallel planes. It is configured to be able to roll and move.

As shown in FIG. 5, the double row angular bearing 25 for infinite linear motion having the above-described structure is fixed to, for example, the V-axis direction moving table 22, and a guide bar 27 is attached to the fixed table 21. The guide rail portion 27a is arranged so as to move while contacting the group of bearing balls 25a, 25a exposed from the holder member of the angular bearing 25 and the other group of bearing balls 25b, 25b.

If so, the bearing ball 25a and the guide rail part 2
The direction of force transmission between the 7a and the direction of force transmission between the bearing ball 25b and the guide rail portion 27a intersect with each other as indicated by the arrow in the bearing ball in FIG. 5, so that the angular bearing 25 and the guide bar The 27 are securely connected to each other without rattling in the horizontal and vertical directions in the figure.

The fixed table 21 and the V-axis direction moving table 22, and the V-axis direction moving table 22 and the U-axis direction moving table 23 of the electrode guide support moving mechanism 10 shown in FIGS. 2 and 3 are infinite straight lines as described above. Since the tables are connected through the double row angular bearing for motion, the tables are securely and firmly connected to each other, and the double row angular bearing for infinite linear motion can be mounted over the entire width of the table. Therefore, even if the weight of the portion of the electrode guide support 8 is considerably heavy, the overhang does not occur near both ends of the table.

[Effect of device]

Since the present invention is configured as described above, according to the present invention, a four-axis control wire-cut electric discharge machine equipped with a moving mechanism for the electrode guide support for taper machining, which is less expensive and more accurate than the conventional one, is provided. Is provided.

It should be noted that the structure of the moving mechanism of the electrode guide support of the wire cut electric discharge machine according to the present invention is not limited to the above-mentioned embodiment, and all the configurations that can be easily conceived by those skilled in the art from the above description. It is intended to include modified examples.

[Brief description of drawings]

FIG. 1 is a general view showing an outline of an embodiment of a wire cut electric discharge machine according to the present invention, and FIG. 2 is a moving mechanism portion of an electrode guide support in the wire cut electric discharge machine shown in FIG. FIG. 3 is an enlarged cross-sectional view of an essential part, FIG. 3 is a top view taken along line III-III in FIG. 2, and FIG. 4 is an external view of a double-row angular bearing for infinite linear motion provided in the moving mechanism of the electrode guide support. FIG. 5 is a sectional view perpendicular to the axis showing the function of the double row angular bearing for infinite linear motion. 1 ... column 2 ... upper arm 3 ... lower arm 4 ... wire electrode 5 ... wire electrode supply drum 6 ... wire electrode recovery drum 7 ... stem 8 ... electrode guide support 9 ... electrode guide 10 …… Electrode guide support moving mechanism 11 …… Electrode guide 12 …… Work piece 13 …… Mounting table 14 …… XY cross slide table 21 …… Fixed table 22 …… V axis direction moving table 23 …… U Axial movement table 24,25 ……………… Double row angular bearing for infinite linear motion 26,27 ………… Guide bar 28 …… V-axis drive motor 29 …… Worm gear 30 …… Shaft with feed screw 31 …… Worm wheel 32 …… Female screw member 33,34 ………… Limit switch 35,36 ……………… Contact member for limit switch actuation 37 …… Double row angular bearing for infinite linear motion 38 …… U axis Directional drive motor 39 …… Omugia 40 ...... feed the threaded shaft 41 ...... worm wheel 42 ...... rotational bearing 43 ...... female screw member 44 ...... fixing screws 45 ...... wire electrode guide pulley

Claims (1)

[Scope of utility model registration request] 1. A mount No. which is controllable in XY biaxial directions, and a UV.
In a four-axis control wire cut electric discharge machine equipped with a biaxially controllable electrode guide support, an electrode guide support 8 to which an electrode guide 9 is attached is continuously held and is substantially flat and rectangular in the horizontal direction. U-axis direction moving table 23, V-axis direction moving table 22 positioned so as to overlap with the upper part of the U-axis direction moving table, and vertically movable from the upper arm so as to overlap with the upper part of the V-axis direction moving table. And a fixed table 21 that hangs down and is attached to the tip of the system 7. The fixed table 21 is provided at one end of the V-axis direction moving table and substantially in the center in the V-axis direction perpendicular to the U-axis. A U-axis direction drive motor and a feed net extending in the U-axis direction at the central portion and connecting the U-axis direction movement table to the V-axis direction movement table by the rotational drive by the motor so as to be movable. And a U-axis drive feed device including a female screw member and one end of the U-axis direction moving table or the fixed table, which is provided substantially at the center in the U-axis direction perpendicular to the V-axis. A V-axis direction drive motor and a feed screw and a female screw member which extend in the V-axis direction at the central portion and which are rotatably driven by the motor to couple the V-axis direction moving table to the fixed table so as to be movable. And a U-axis and V-axis direction moving table at both ends in the V-axis direction which is perpendicular to the U-axis, and extend parallel to the U-axis direction and make relative contact with each other substantially in the V-axis direction. And a U-axis movement guide device composed of a pair of guide bars fixedly provided so as to guide relative movement in the U-axis direction and a double-row angular bearing for infinite linear motion, and a U-axis perpendicular to the V-axis. V-axis direction on both ends in the axial direction An infinite pair of guide bars fixed to the movable table and the fixed table so as to extend parallel to the V-axis direction and contact each other substantially in the U-axis direction so as to be relatively movable in the V-axis direction. The above-mentioned four-axis control wire-cut electric discharge machine having a V-axis movement guide device composed of a double-row angular bearing for linear movement.