JPH0457624A - Wire electric discharge machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a wire electrical discharge machining device, and in particular, a wire electrical discharge machining device that can easily remove the inner (core) portion of the machining trajectory of a workpiece. It is related to.

[Prior Art] FIG. 4 is a perspective view showing a conventional wire electrical discharge machining apparatus, which is also published in Japanese Patent Publication No. 63-59810.

In the figure, (1) is the workpiece to be processed, (2)
is a mounting base that supports the workpiece (1) almost vertically, (3) is a vertically movable table to which the mounting base (2) is fixed, and (4) is a mounting base that supports the workpiece (1) almost vertically.
- A slider for vertically moving the lower slide table (3), (
5) is a guide that guides the movement of the slider (4); (6)
is a vertical feed screw screwed into the vertically movable table (3) and slider (4), and (7) is a drive motor that rotates the feed screw (6). (8) is a wire electrode, (9
) is a substantially U-shaped pedestal that is directed substantially horizontally, and during wire electrical discharge machining, the workpiece (1) is positioned between the substantially U-shaped tip portions of the pedestal (9). (10) is a collection roller arranged on the top surface of the pedestal (9), and the wire electrode (8)
Collect. (11) is a guide roller located on the wire supply side of the pedestal (9), (12) is a guide roller located on the wire collection side of the pedestal (9), (13) is the guide roller located on the pedestal (9)
(14) is an automatic wire connection means attached to the approximately U-shaped wire supply side tip, and automatic wire connection means (14) is also attached to the U-shaped wire collection side tip of the mount (9). The pair of automatic wiring means (13) and (14) connects and disconnects the wire electrode (8), and connects and disconnects the wire electrode (8).
8) Provide guidance during driving. (15) is the workpiece (1
) The automatic wire connection means (14) is connected to the workpiece (
1) an automatic wire connection means support that adjusts and fixes in the thickness direction; (16) a slider that moves the pedestal (9) in the horizontal direction; (17) a guide that guides the movement of the slider (4); 18) is a horizontal feed screw screwed into the frame (9) and slider (16), and (19) is a feed screw (
18). (20) is the machining trajectory by wire electrical discharge machining, and this machining trajectory (20
), the workpiece (1) has an outer part (1a) and an inner part (
It is divided into a core part (1b) and a core part (1b).

A conventional wire electrical discharge machining device is configured as described above, and performs electrical discharge machining while relatively moving the mounting base (2) to which the workpiece (1) is fixed and the wire electrode (8). By doing so, the workpiece (1) is processed into a desired shape. That is, the vertical feed screw (6) is rotated forward and backward to move the mounting base (2) and the workpiece (1) appropriately in the -vertical direction, and the horizontal feed screw (18
) is rotated forward and backward to move the wire electrode (8) in the horizontal direction appropriately, and wire electrical discharge machining is performed while the vertical movement and horizontal movement are coordinated with each other. ), draw a machining locus (20) of a predetermined shape, and move the workpiece (1) between the outer part (1a) and the core part (1b).
) and were separated.

The running speed and tension of the wire electrode (8) during processing are controlled by a drive device and a tension adjustment mechanism (both not shown) installed in the pedestal (9), and its running position is determined by a pair of automatic wire connections. It is precisely regulated by means (13) and (14). Further, a predetermined repeated pulse voltage is applied to the wire electrode (8) and the workpiece (1) from a processing power source (not shown), and the wire electrode (8) and the workpiece (1) are
) generates a discharge between the Furthermore, wire electrodes (
8) and the workpiece (1), machining fluid is jetted and supplied from a machining fluid supply device (not shown) to remove machining powder and cool it during machining.

Even when the portion (1b) was completely separated, the inner (core) portion (1b) remained supported within the outer portion (1a).

However, in order to proceed to the next processing step after the processing step F in which the outer portion (1a) and the core portion (1b) are separated is completed, it is necessary to separate the outer portion (1a) and the core portion (1b). ) had to be quickly removed from the outer part (1a). Therefore, in the conventional wire electric discharge machining apparatus of this type, it was necessary to provide a dedicated special removal device or the like.

Therefore, it is an object of the present invention to provide a wire electrical discharge machining device that can easily remove the core portion of a workpiece.

[Problems to be Solved by the Invention] In the conventional wire electrical discharge machining apparatus as described above, the workpiece (1) is supported substantially vertically and the wire electrode (8) is run substantially horizontally to perform electrical discharge machining. was. Therefore, the outer part (1a) of the workpiece (1) is determined by the machining trajectory (20).
) and the inner side (core) [Means for solving the problem] The wire electrical discharge machining apparatus according to the present invention has a workpiece (1)
A pair of automatic wiring means (
1B), a mounting base (2) that supports the workpiece (1) substantially vertically between them; A driving means for forming a machining trajectory (20) on the object (1) by wire electric discharge, and a drive means for forming the mount (2) together with the workpiece (1) on a horizontal axis perpendicular to the running direction of the wire electrode (8). It is equipped with a rotation means for rotating around the center.

Since the electrode (8) is rotated around a horizontal axis perpendicular to the running direction, after electrical discharge machining, due to this rotation, the core part (1b) of the workpiece (1) is rotated outward by its own weight. It automatically slides out from part (1a).

[Operation] In the present invention, the workpiece (1) is supported substantially vertically by a mounting base (2) between a pair of automatic wire connection means (13) and (14) supported in a substantially horizontal position, and this automatic A wire electrode (8) is placed approximately horizontally between the connection means (13) and (14).
The electric discharge During machining, the core part (1b) of the workpiece (1) to be separated by the machining path (20) is supported within the outer part (1a), and during this machining After forming the locus (20), the mount (2) is attached to the wire together with the workpiece (1) [Example] Hereinafter, the present invention will be described in detail.

FIG. 1 is a perspective view showing a wire electrical discharge machining apparatus which is an embodiment of the present invention. In addition, in the figure, from (1,) to (20
) indicates a component that is the same as or corresponds to the component in the conventional example described above, and therefore, redundant explanation will be omitted.

In the figure, (21) is a rotation support that rotatably supports the mount (2), and (22) is a drive motor attached to the rotation support (21). And this rotating support stand (
21) and the drive motor (22), after forming the machining trajectory (20), move the mounting base (2) together with the workpiece (1) around a horizontal axis perpendicular to the running direction of the wire electrode (8). It serves as a rotating means for rotating.

The wire electrical discharge machining apparatus of this embodiment is constructed as described above, and is the same as the conventional apparatus, with the addition of rotation means consisting of a rotation support table (21) and a drive motor (22). Then, by performing electrical discharge machining while relatively moving the mounting base (2) to which the workpiece (1) is fixed and the wire electrode (8), the workpiece (1) is shaped into the desired shape. It is being processed.

Here, the machining procedure using this wire electric discharge machining apparatus will be explained. FIG. 2 is a front view showing a workpiece and a machining trajectory by wire electric discharge machining.

In the figure, (20) is a machining trajectory by wire electric discharge machining, (20a) is a machining start part, (20b) is a machining end part, and (20c) is a wire electrode (8)
The small hole (20d) through which it is inserted is a run-up section that connects the small hole (20c) and the machining start part (20a). By forming this machining trajectory (20), the workpiece (1) is divided into an outer portion (1a) and an inner (core) portion (1b).

Prior to starting this electric discharge machining, the workpiece (1)
The workpiece (
1) Fix it to the mounting base (2). And this small hole (2
0c) and insert the wire electrode (8) into the automatic wire connection means (1
3) and (14) to prepare for the start of discharge.

After this preparation is completed, a predetermined voltage is intermittently supplied while running the wire electrode (8) and maintaining a predetermined distance between the wire electrode (8) and the workpiece (1). Perform electrical discharge machining.

First, the wire electrode (8) is moved relative to the workpiece (1) by driving the drive motor (7) and rotating the feed screw (6) to lower the mounting base (2). raise. In this way, first, the run-up section (20d) is subjected to electrical discharge cutting.

This run-up section (20d) is the machining start section (20a).
), the drive motor (19) is driven, the feed screw (18) is rotated, and the electrical discharge machining is continued while horizontally moving the pedestal (9). Thereafter, the drive motor (7) is also driven as appropriate to move the workpiece (1) up and down. In this way, by continuing the wire discharge while relatively moving the mounting base (2) and the wire electrode (8), a machining trajectory (
20) is formed. Incidentally, if the desired machining shape is a complicated shape on the workpiece (1), the control device (not shown) will coordinate both the drive motors (7) and (19) for lifting and lowering and for horizontal movement. Just make it work.

Finally, the machining end part (20b) of the machining trajectory (20) by the wire electrode (8) is the already formed machining start part (20a).
), the machining start part (20a) and the machining end part (20b
), the formation of the machining locus (20) is completed and the electric discharge machining is completed. Then, this machining trajectory (20
), the workpiece (1) is divided into an outer part (1a) and a core part (1b).

In particular, as shown in FIG. 2, the machining start part (20a) of the machining trajectory (20) is set above the center of gravity G position of the predetermined shape to be machined, and the route of the machining trajectory (20) is set at the start of the machining. By forming a machining locus (20) by wire discharge on the workpiece (1) by setting the direction opposite to the rotational direction of the rotational moment of the center of gravity G regarding the part (20a), the wire It is possible to prevent accidents such as breakage of the electrode (8), and stable electrical discharge machining is possible until the end.
) enables smooth electrical discharge machining.

When the electrical discharge machining is completed and the formation of the machining path (20) is completed, the core portion (1b) of the workpiece (1) falls by the distance of the cutting groove, and remains as it is.
a) held within.

Next, the operation of removing this core portion (1b) will be explained.

FIG. 3 is a front view of main parts showing a core removal operation by the wire electrical discharge machining apparatus of FIG. 1. FIG. In the drawings, the same reference numerals and symbols as in the above embodiment indicate constituent parts that are the same as or correspond to the constituent parts in the above embodiment.

The wire electrical discharge machining apparatus of this embodiment has a rotation means consisting of a rotation support table (21) and a drive motor (22) in a double-connected manner. After the machining trajectory (20) is formed by the above procedure, this rotating means is activated to move the mounting base (2) together with the workpiece (1) perpendicular to the running direction of the wire electrode (8). Rotate around a horizontal axis.

This procedure begins with the wire electrode (
8) Cut. This cutting is performed by an automatic wiring means (13),
(14) is automatically performed.

Subsequently, the workpiece (1) supported by the mounting base (2) is driven by the drive motor (22) attached to the rotation support base (21).
) The mount (2) and the workpiece (1) are rotated around a rotating shaft (not shown) connected to the mount (2) and the workpiece (1). Due to this rotation, the outer part (1a) and the core part (1b) of the workpiece (1) rotate together, but when rotated to a certain angle,
This core part (1b) becomes the outer part (1a) due to its own weight.
automatically slides out.

As described above, in this embodiment, since the core portion (1b) of the workpiece (1) can be easily removed, for example, the above-mentioned process of separating the outer portion (1a) and the core portion (1b) can be performed. This is extremely convenient in cases where, after a process is completed, the next processing process is to be continued. Moreover, as before,
There is no need to provide a dedicated special removal device or the like for removing the core portion (1b) of the workpiece (1). For this reason,
It can greatly contribute to the promotion of completely unmanned automation of wire electrical discharge machining equipment. In particular, when electrical discharge machining is performed intermittently on multiple workpieces independent of one workpiece (1) using a wire electrical discharge machining device, the There is no need to remove the core portion (1b) at the same time, and the core portions (1b) can be removed all at once after the machining of all the plurality of pieces is completed, so that the total machining time can be shortened. You can also do it. Further, even if there is a portion where the core portion (1b) is not cut out from the workpiece (1), the wire electrical discharge machining apparatus will not be damaged.

As described above, the wire electrical discharge machining apparatus of this embodiment includes a pair of automatic wire connecting means (13) and (14) supported in a substantially horizontal position with the workpiece (1) in between, and a wire electrode (8) running approximately horizontally between the means (13) and (14); and the pair of automatic wire connection means (13).
, (14), a mount (2) that supports the workpiece (1) substantially vertically, and a machining trajectory (20) by relatively moving the mount (2) and the wire electrode (8). ) machining start part (
20a) is set above the center of gravity G position of the predetermined shape to be machined, and the route of the machining trajectory (20) is set at the machining start part (
The workpiece (1) is set so as to be in the opposite direction to the rotational direction of the rotational moment of the center of gravity G regarding 20a).
a driving means for forming a machining locus (20) by wire discharge;
) together with the workpiece (1) about a horizontal axis perpendicular to the running direction of the wire electrode (8).

A pair of automatic wiring means (
1B) and (14), the workpiece (1) is supported substantially vertically by a mounting base (2), and this automatic wire connection means (13),
(14) A wire electrode (8) is run approximately horizontally between the
The mounting base (2) and the wire electrode (8) are moved relatively, and the machining trajectory (
20), therefore, during electrical discharge machining, the core part (1b) of the workpiece (]) to be separated by the machining path (20) is placed in the outer part (1a). State supported. Further, after forming this machining trajectory (20), the mounting base (2) is rotated together with the workpiece (1) about a horizontal axis perpendicular to the running direction of the wire electrode (8). Therefore, after electrical discharge machining, the core part (1b) of this workpiece (1) automatically slides out from the outer part (1a) due to its own weight.

Therefore, the core part (1b
) can be easily removed, making it extremely convenient when automatically performing multiple machining processes in succession.Moreover, it is possible to remove the core part (1b) of the workpiece (1) as in the conventional method. There is no need to provide a dedicated special removal device or the like.

[Effects of the Invention] As described above, the wire electrical discharge machining apparatus of the present invention moves the mount that supports the workpiece and the wire electrode that runs substantially horizontally with the mount to relatively move the workpiece. between a pair of automatic wire connecting means supported in a substantially horizontal position, comprising a driving means for forming a machining locus on the workpiece by wire electric discharge, and a rotation means for rotating the mounting base together with the workpiece after forming the machining locus; A workpiece is supported approximately vertically by a mounting base, a wire electrode is run approximately horizontally between the automatic wire connecting means, the mounting base and the wire electrode are relatively moved, and the wire is attached to the workpiece. By forming a machining trajectory by electrical discharge, the inner (core) part of the workpiece to be separated by the machining trajectory is supported while being placed within the outer part during electrical discharge machining. After forming the machining trajectory, the mount is rotated together with the workpiece around a horizontal axis perpendicular to the running direction of the wire electrode. It can automatically slide out from the outer part by
The core part of the workpiece can be easily removed, and it is extremely effective when automatically performing multiple processing steps in succession.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a wire electrical discharge machining device which is an embodiment of the present invention, and Fig. 2 shows a workpiece and a machining trajectory by wire electrical discharge machining of the wire electrical discharge machining device which is an embodiment of the present invention. 3 is a front view of a main part showing a core removal operation by the wire electric discharge machining apparatus of FIG. 1, and FIG. 4 is a perspective view of the conventional wire electric discharge machining apparatus. In the figure, 1: Workpiece 1a: Outside portion 1b = inside (core) portion 2: Mounting table 3: Vertical moving table 6:
Feed screw 7: Drive motor 8: Wire electrode 13
: Automatic wiring means 14: Automatic wiring means 18: Feed screw 19: Drive motor 20: Machining trajectory
21: Rotation support base 22: Drive motor. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts. Agent: Patent attorney Daikichi Masuo and 2 others b

Claims (1)

[Scope of Claims] A pair of automatic wiring means supported in a substantially horizontal position on both sides of a workpiece, a wire electrode running approximately horizontally between the pair of automatic wiring means, and a wire electrode between the pair of automatic wiring means. a mount for supporting a workpiece substantially vertically; a driving means for relatively moving the mount and a wire electrode to form a machining trajectory by wire electric discharge on the workpiece; A wire electrical discharge machining apparatus comprising a rotating means for rotating a workpiece together with a horizontal axis perpendicular to a running direction of a wire electrode.