JPH02269523A - Wire cutting electric discharge machine - Google Patents

Abstract

PURPOSE:To enlarge a moving range of an upper table to enable a large processing by providing driving devices of an upper table in both ends of a bed respectively, and synchronizing each feed of the upper table by the driving devices to move the upper table. CONSTITUTION:An upper table 2 provided on a bed 1 is moved by two servo- motors 14-1, 14-2. The servo-motors 14-1, 14-2 are held by holding stands 26-1, 26-2 fitted in both ends of the bed 1, and have feed screws 27-1, 27-2. Screw receiving parts 28-1, 28-2 are threadedly engaged with the feed screw 27-1, 27-2, and are respectively fixed in both ends of the upper table 2. Since a mechanism described before is provided, avoiding an opening hole 12 of the upper table 2, the feed screws 27-1, 27-2 in long size can be used. Consequently, the upper table 2 can be moved large. The servo-motors 14-1, 14-2 are facilitated to be synchronized by using, for example, pulse motors.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method of running a wire electrode to which a discharge voltage is applied,
This relates to a wire-cut electrical discharge machine that processes a workpiece by generating electrical discharge between a wire electrode and a workpiece using machining fluid, and in particular, an X-Y electric discharge machine that moves freely in orthogonal directions. This invention relates to a table driving device for a table.

[Prior Art] In general, a wire-cut electrical discharge machine runs a wire electrode while spraying machining fluid onto the discharge portion or applying a discharge voltage in the machining fluid. For example, the cutting process of a workpiece is performed by generating an electric discharge in between.

Conventionally, the upper table and the lower table, which are formed to be slidable in the X-Y direction in a horizontal plane, are driven by drive devices provided at the center of the upper table and the lower chifur, respectively, and the upper table and the lower table are moved with respect to the wire electrodes. The upper table and lower table were controlled to be in the desired position.

[Problems to be Solved by the Invention] A column is installed upright, and an upper wire guide is provided on the fingers forming a part of the column, and a lower ear guide device is installed below the upper wire guide. In a twist-cut electrical discharge machine having a structure in which the wire electrodes are placed opposite to each other and the wire electrodes are stretched between the two, at least the upper table has a large opening hole drilled in the center for the escape of the wire electrodes. For this reason, a system in which a driving device for sliding the upper table is provided to drive the upper table at the center of the upper table has the disadvantage that a sufficient stroke cannot be achieved. Therefore, the movement range of the upper chifur was narrow, and there was a drawback that large-scale machining could not be performed.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned drawbacks, and aims to provide a wire can 1-electrical discharge machine which allows a large movement range of the upper table and enables large-scale machining.

[Failure to solve the problem]

In order to achieve the above object, the power discharging power DI machine to the wire cutter 1 according to the present invention has an upper table and a lower table mounted on a vent so as to be movable in the orthogonal X-Y directions, and a column erected. A lower wire guide device is provided facing each other below the upper wire guy 1 to the finger portion constituting the upper part of the column, and at least the upper wire guide device is provided between the upper wire guide and the lower wire guide device. A wire electrode is stretched through an opening hole drilled in the table, and a machining fluid is used to generate an electrical discharge between the workpiece placed on the upper table and the wire electrode. In the wire cutter I/discharge force 11 machine to be processed, an upper table driving device for moving the upper table in the horizontal χ direction is provided at both end portions of the upper table and a head at a position corresponding thereto. It is characterized by a structure in which each of the 11 tables is moved in synchronization by the two upper table drive devices provided at both ends.

(Function) For example, regarding the upper table, a mechanism (drive device) for moving the upper table is provided at both ends avoiding the position of the opening hole drilled in the upper chiffle, so the stroke is sufficiently The upper table can be moved widely.

(Embodiment) Fig. 1 is a partially sectional front view showing an embodiment of the present invention, and Fig.
The figure is a partially sectional side view showing one embodiment of the present invention. In the figure, an upper table 2 and a lower table 3, which are formed to be slidable in a horizontal plane in orthogonal directions, are installed in the head I'2, which can be driven by numerical control, for example.
It constitutes a Y table. In this case, a recess 1a is provided in the hem 1" 1 to accommodate the lower table 3. A column 4 formed in a substantially inverted shape at one end of the lower table 3 has its finger portion 4a Upper table 2'
It is erected facing on two sides. An opening hole 12 is provided approximately in the center of the upper table 2, and a lower wire guide device 7 is provided in the center of the lower table 3. The lower wire guide device 7 faces directly below the upper wire guide 6 provided on the finger portion 4a of the =1 ram 4 and projects into the opening hole 12.

The side wall surface of the open hole 12 bored in the approximate center of the upper table 2 and the two stepped surfaces of the lower table 3 form a machining liquid storage tank, which is completely sealed. Not that there is. That is, as shown in the explanation of the enlarged gap between the lower end surface of the open hole in the lower table and the upper end surface of the one-piece chiffle in FIG. is provided with a rib 2a 1 The rib 2a
extends to the end surface 3a of the lower table 3 provided with a step. The lower end surface of the rib 2a provided at the periphery of the opening hole 12 and the lower table 3 provided with the above-mentioned step.
The gap S between the upper end surface 3a and the upper table 2. Depending on the accuracy of the mounting IJ of the rails 21 and 22 that move the lower table 3 in the X-Y directions and the respective movement mechanisms of the upper table 2 and the lower table 3, for example, 0.1 to 1,0 mm ± 50%. Retained.

Since the lower end surface of the rib 2a and the upper end surface 3a of the lower table 3 have the gap S in this way, the relative movement between the upper chiffle 2 and the lower table 3 can be performed freely. Since the gap S is small, the machining fluid flowing out from the gap S only comes out by i8 mm, and the machining fluid stays in the liquid retention tank under a force of 11. The machining fluid seeped out from the gap S is returned to the machining fluid supply device 25 through a drain hole (not shown) and a drain pipe 24 that are connected to the upper end surface 3a of the lower table 3 with a one-step difference.

1, i-114-2, 15 are each servo motors 1
Receiving control signals from a numerical control device (not shown), etc., -
The first table 2 and the lower table 3 are moved to desired positions. That is, servo motor 1
4-1. If-2 is a holding stand 26-1 26-2 (holding stand 26-2) attached to both ends of the head 1, respectively.
1 is not shown), and a feed screw 27-1 is attached to the shaft of each servo motor 14-1, 14-2.
27-2 (the feed dog 27-1 is not shown) is connected. On the other hand, screw receiver portions 28-1.28-2 are fixed to both end portions of the upper table 2, respectively, to screw into the feed screws 27-1.27-2. These mechanisms for moving the upper table 2 are provided at the end avoiding the opening hole 12 made in the table 2, so the feed screws 27-1 and 27-2 are A long one can be used, and therefore the upper table 2 can be moved over a large distance. Furthermore, the servo motor 14
-1.14-2 uses a pulse motor, etc., which can easily synchronize between the two, and the upper table 2 is completely fed by the feed screw 27-1.27-2 between the two. Needless to say, the same JLL is taken.

Regarding the movement of the lower table 3, in the case of the embodiment shown in FIGS. Since the wire electrode 8 stretched between the wire guide and the lower table 3 moves integrally with the lower table 3, a moving mechanism can be provided at the center of the lower table 3.

That is, the servo motor 15 is held by a holding stand 29 attached to the central portion of the bed 1, and a feed screw 30 is connected to its shaft. On the other hand, a long groove 31 is provided in the center of the lower table 3.

A screw receiving part 3 that is screwed into the long groove 31 with the feed screw 30
2 is fixed.

Reference numeral 17 denotes a storage box which can be moved in and out of the head 1 and is arranged so that used wire electrodes 8 can be stored therein.

With the above configuration, the workpiece is placed and fixed on the upper table 2 directly or via a metal fitting (not shown), and the wire electrode 8 is connected to the upper wire guide 6 and the lower wire guide device W7. By applying a discharge voltage to the wire electrode 8 and moving it in the direction of the arrow, the workpiece can be subjected to electrical discharge machining. For example, the machining fluid is sprayed onto the JJII machining section, falls within the machining fluid tank 11, and is stored in the machining fluid storage tank formed by the side wall surface of the opening hole 12 and the upper end surface 3a of the lower table 3. be done.

The upper table 2 and the lower table 3 can be moved significantly when processing a wave-forced workpiece.

FIG. 4 shows a partial cross-sectional pressure surface view of another embodiment corresponding to the first one. The configuration shown in FIG. 4 is one in which the concept of the present invention is applied to the configuration of Japanese Patent Application No. 1983-273190 (dated November 17, 1986), which was previously proposed by the present inventor.

Codes 1.2, 3, 46.7.8, 11, 12.2 in the diagram
a, 3b, 21.22 correspond to Fig. 1, respectively, and W
The workpiece 3a' represents the surface on the bed 1 facing the lower end of the open hole 12. 15-1 are two servo motors 15-1 provided at both ends of the lower table 3.
．． 15-2, and 27-1 and 272 indicate feed screws of two servo motors 14-1 and 14-2 (not shown) provided at both ends of the upper table 2.

In the case of the embodiment shown in FIG. 4, the opening hole 12 is bored not only in the upper table 2 but also in the lower table 3.
A rib 2a corresponding to the shape of the opening formed in the upper table 2 passes through the opening formed in the lower table 3 and extends to the surface of the bed 1. In this embodiment as well, the gap between the lower end of the rib 2a and the upper surface 3a' of the bed 1 is the same as that shown in FIG. In the case of the embodiment shown in FIG. 4, drain holes 23-1 and 23-2 are provided at the positions shown.

〔Effect of the invention〕

As explained above, according to the present invention, even in a wire cant electrical discharge machine in which an opening hole is bored in the center of the upper table, the movement range of the X-Y table can be widened, and a large amount of cutting can be performed.

In addition, large-scale machining is possible, and at the same time, the upper liquid can be
Since processing can be performed while storing the water in the center of the table, the upper and lower tables are kept at the same temperature, and even if the table temperature increases by 1, there is no difference in distortion between them.
Machining accuracy is also good. In other words, even when large-scale processing is performed on a large workpiece, the processing accuracy is good.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing one embodiment of the present invention, and FIG.
The figure is a partial cross-sectional side view showing an embodiment of the present invention, and Figure 3 is an enlarged diagram illustrating the enlarged gap between the lower end surface of the opening hole of the lower table and the upper end face of the upper table. An example of this is shown. In the figure, 1 is a bed, 2 is an upper table, 3 is a lower table, 4 is a column, and 6 is an upper wire guide. 7 is a lower wire guide device, 8 is a wire electrode, 12 is an opening hole, 14-1.14-:2.15', and 151 is a servo motor. Patent applicant: Discharge Precision Machining Institute Co., Ltd. Representative Patent Attorney Hiroshi Mori (2 others)

Claims (1)

[Claims] An upper table and a lower table are placed on a bed so as to be movable in orthogonal X-Y directions, and a column is erected, and an upper wire guide is attached to a girder part constituting the upper part of the column.
Lower wire guide devices are provided below the upper wire guide to face each other, and wire electrodes are stretched between the upper wire guide and the lower wire guide device through at least an opening hole drilled in the upper table. In a wire-cut electric discharge machine that processes a workpiece by causing electrical discharge between a workpiece placed on the upper table and a wire electrode using machining fluid, the upper table is moved in the horizontal X direction. An upper table driving device for moving the upper table is provided on both ends of the upper table and the bed at a corresponding position, and the upper table is moved by the two upper table driving devices provided on both ends of the bed and the upper table. A wire-cut electric discharge machine characterized by having a configuration in which each feed is synchronized before movement.