JPH04201017A - Dipping process type wire cut electric discharge machine - Google Patents

Abstract

PURPOSE:To bear high water head, and to ensure moving regions on the entire width of a process tank by providing a sealing mechanism formed out of a pair of supporting bodies on both sides of am arm fitting plate, a side wall of the process tank on the surface of the supporting body, and of a sealing plate for retaining watertightness. CONSTITUTION:Supporting bodies 142 comprising a plurality of lengthwise bands of plate material arms 142a that are connected with each other, are mounted on both sides of the plate of an arm fitting plate 141, and its upper side as well as the lower side are retained in such a way that they can slide along guide rails 144, 145, while the supporting body 142 is slid along the side wall of a process tank 5 along with the arm fitting plate 141, at the time of relative movement of the process tank and a lower arm 10. A band-shaped sealing plate 143 such as soft stainless steel is mounted on the inner surface of the supporting body 142, and by fitting sealing line springs 152, 153 provided on guide plates 150, 151 mounted along the upper and lower sides of an opening 5a' of the side wall 5a, and the sealing plate 143 together airtight, the leakage of the process liquid in the process tank 5 is inhibited, and perfect sealing function is thus achieved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an immersion machining type wire-cut electric discharge machining device,
In particular, it relates to improvements in the sealing means of the lower arm penetrating the processing tank and its side wall.

[Conventional technology]

Wire-cut electrical discharge machining equipment does not require the production of electrodes corresponding to the machining shape each time it is machined, unlike regular electrical discharge machining equipment, and with the development of NC equipment, it is possible to operate unattended for long periods of time. , is now widely used.

In wire-cut electrical discharge machining equipment, the wire electrode is usually stretched in a straight line with appropriate tension between a pair of electrode guides provided at the ends of two upper and lower arms, and the wire electrode is stretched between the workpiece and the wire electrode. A voltage pulse is applied between the wire electrode and the workpiece with machining fluid interposed between them to generate an electric discharge, and a numerical control device applies a relative machining feed between the wire electrode and the workpiece to perform the desired contour machining. It is something to do.

A method for interposing machining fluid between the workpiece and the wire electrode is immersion machining, in which a machining tank is filled with machining fluid and the entire workpiece placed in the machining tank is immersed in the machining fluid to perform electrical discharge machining. There are two types: one is a jet type, and the other is a jet type, in which machining liquid is ejected and supplied from nozzles provided above and below the workpiece to the machining part where the wire electrode and the workpiece face each other. This relates to the immersion processing method.

Therefore, in immersion machining type wire-cut electric discharge machining equipment, there is a problem of sealing between the side wall and the lower arm that extends from the machine main column through the side wall of the machining tank and into the machining tank. When the lower arm and the lower arm move relative to each other, it is necessary to provide a sealing mechanism that allows such movement and prevents liquid leakage.

As such a sealing mechanism, one using a bellows or a flexible belt has been proposed (Special Publication Publication No. 63
48653, etc.), or it was impossible to perform machining by filling a deep machining tank with a large amount of machining fluid, due to problems in terms of strength.

Also, a method using a shielding plate that moves along the side wall has been proposed (Japanese Unexamined Patent Publication No. 60-52223, etc.), but the movable range is narrow, and a large processing tank is required to increase the movable range. There were other inconveniences.

[Problem that the invention seeks to solve]

The present invention has been made to solve the above problems, and its purpose is to have sufficient strength,
It is an object of the present invention to provide an immersion machining type wire-cut electric discharge machining device that can withstand high water head pressure and is equipped with a seal mechanism that can secure a movable range over the entire width of a machining tank.

[Means for solving problems]

The above purpose is to immerse the workpiece in the machining liquid in the machining tank, and to connect the upper arm extending from the column onto the machining tank and the lower arm penetrating the side wall of the machining tank and extending into the machining tank. In an immersion-type wire-cut electrical discharge machining device that performs electrical discharge machining using a suspended wire electrode, a wire electrode that extends from the column into the processing tank through a horizontally elongated side wall opening formed in the side wall facing the column of the processing tank. A lower arm is attached to the outer periphery of the lower arm to hold the lower arm so as to be able to move watertightly in the axial direction thereof, and the lower arm is moved along the opening while covering a part of the side wall opening of the processing tank. An arm fitting plate that can be slid horizontally with respect to the processing tank together with the lower arm, and a number of vertically long strip-shaped plate pieces having a height equal to or higher than the height of the side wall opening of the processing tank are mutually connected at their vertical sides. The plate material piece at one end is attached to one side of the arm fitting plate, and the upper and lower sides are attached to the side wall of the processing tank where the opening is provided. It extends horizontally from the outer periphery to the outer periphery of the adjacent side wall, and is held so as to be able to slide along the idle rail, and is configured to slide along the side wall of the processing tank together with the arm fitting plate when the processing tank and the lower arm move relative to each other. , a pair of support bodies respectively attached to both sides of the arm fitting plate, and a flexible band-shaped seal plate affixed to the surface of the support body to maintain watertightness with the side wall of the processing tank. This can be achieved by the above-mentioned immersion machining type wire-cut electrical discharge machining apparatus, which is characterized by the following.

Further, the lower arm is composed of a wire electrode running arm and a machining liquid feeding arm that are arranged close to each other in parallel, and the arm fitting body is firmly attached to the machining liquid feeding arm. It is recommended that the arm for running the wire electrode be loosely attached to the arm for running the wire electrode through flexible packing so that the load during movement of the seal mechanism is not applied to the arm for running the wire electrode.

[For production]

With the above configuration, the chain-type belt-shaped support body has sufficient strength and can withstand high water head pressure, and when the processing tank and the lower arm move relative to each other, the support body is inserted through the lower arm of the processing tank. Since it moves around to the side of the side wall adjacent to the side wall that has been opened, it is possible to secure a movable range over the entire width of the processing tank. In addition, by firmly attaching the arm fitting to the arm for feeding the processing liquid, and loosely attaching it to the arm for wire electrode travel through flexible packing, it is possible to reduce the load on the wire when moving the seal mechanism. It is possible to prevent the wire from touching the electrode running arm, thereby making it possible to prevent a decrease in processing accuracy due to bending of the wire electrode running arm.

〔Example〕

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

Fig. 1 is a schematic diagram showing the overall configuration of an immersion machining type wire-cut electrical discharge machining apparatus according to the present invention, and Fig. 2 is a schematic diagram showing the overall configuration of an immersion machining type wire-cut electric discharge machining apparatus according to the present invention.
C- in Figure 4 shows an outline of the sealing mechanism installed in the machining tank of the immersion machining type wire-cut electrical discharge machining equipment.
3 is a perspective view showing details of an embodiment of the sealing mechanism, and FIG. 4 is a sectional view taken along line C, and FIG. 4 is line C-C in FIG. 5 is a sectional view along C in FIG. 4 to show details of the sealing mechanism.
6 is a sectional view showing an embodiment of the sealing device between the wire electrode running arm and the arm fitting plate, and FIG. 7 is a sectional view taken along the line C. It is a sectional view showing one example of the sealing device between plywood.

As shown in FIG. 1, the immersion machining type wire-cut electric discharge machining apparatus according to the present invention is roughly divided into column 1, column 1,
It is composed of a head 2, an X-axis moving table 3, an X-axis moving table 4, a processing tank 5, a stage 6, an upper arm 9, a lower arm IO, etc.
The machining head 11 was immersed in the machining liquid 8 in the tank and was provided on the upper arm 9 that extended from the column l onto the machining tank 5, and the lower arm lO that penetrated the side wall of the machining tank and extended into the machining tank. Electrical discharge machining is performed on the workpiece 7 by a wire electrode 13 that is suspended between the wire electrode 13 and the machining head 12 and continuously updated and moved in one direction.

As shown in FIG. 2, the side wall 5a of the processing tank 5 facing the column has a horizontally long side wall opening 5a' extending in the horizontal direction.
A lower arm IO is provided to extend from the column 1 into the processing tank 5 through this side wall opening 5a'. The lower arm 10 is composed of a wire electrode running arm lOa and machining liquid feeding arms 10b and loc, which are arranged close to each other in parallel.

In order to apply machining feed between the workpiece 7 and the wire electrode 13 during machining, a numerical control device or the like is used to control X.
By driving the axial movement table 3 and the X-axis movement table 4, the machining tongue with the workpiece 7 attached
When the entire tank 5 is moved in the X and Y axis directions, the processing tank 5 moves relative to the lower arm 10 that penetrates the side wall 5a of the processing tank 5. 10 is achieved by a sealing mechanism 14, which will be described below.

The sealing mechanism 14, as shown in FIGS. 2 to 5,
It is attached to the outer periphery of the lower arm 10, and holds the lower arm so as to be able to move watertightly in its axial direction, and moves along the opening along the lower arm with the processing tank while covering a part of the side wall opening of the processing tank. An arm fitting plate 141 that can be slid in the horizontal direction, and a large number of vertically long strip-shaped plate pieces 142a having a height equal to or higher than the height of the side wall opening of the processing tank are arranged in a chain type so that they can rotate freely with respect to each other along their vertical sides. The plate material piece at one end is attached to one side of the arm fitting plate, and its upper and lower sides are connected to the opening 5a' of the processing tank.
A side wall 5b adjacent to the outer periphery of the side wall 5a provided with
The outer periphery of 5c extends horizontally, but the rail 144.1
45, and are attached to both sides of the arm fitting plate, respectively, so as to slide along the side wall of the processing tank together with the arm fitting plate when the processing tank and the lower arm move relative to each other. It consists of a support body 142 and a flexible band-shaped sealing plate 143 that is attached to the surface of the support body and maintains watertightness with the side wall of the processing tank.

That is, the arm fitting plate 141 has three plates 141a, 141b, and 141c, as shown in detail in FIG. 3 (in the figure, the front side faces the inside of the processing tank).
are fixed with screws etc. through necessary sealing members, etc., and wire electrode running arms IOa are attached to these plates.
and holes 1410b and 1410a for inserting the machining liquid feeding arms IOb and IOc.
410c is formed. In addition, in order to insert the wire electrode running arm 10a and the machining liquid feeding arms 10b and 10c into these holes in a watertight manner and movably in the axial direction of these arms, as shown in FIGS. A sealing means as shown in FIG. 7 is installed.

Support bodies 142 are attached to both sides of the plate 141c of the arm fitting plate 141, and are formed by connecting a large number of vertically long strip-shaped plate pieces 142a in a chain shape. That is, as shown in FIGS. 4 and 5, each plate piece 142a
A pair of mooring plates 142a-1 are fixed to the outside of the mooring plate 142a-1, and retaining plates of adjacent plate pieces 142a or connecting plates 142a-2
The support body 142 is formed by being rotatably connected to each other in a chain shape within a certain range by a pin 142a-3.

The upper and lower sides of the support body 142 are provided with guide rails 144 and 145 (see FIGS. (see figure), and when the machining tank 5 and the lower arm lO move relative to each other, they slide along the side wall of the machining tank together with the support body 142 or the arm fitting plate 141. .

The upper idle rail 144 is equipped with a pressure piece 146 whose surface is coated with Teflon (registered trademark) or the like for low friction treatment, and an adjustment screw 147 for bringing this into contact with the plate piece 142a with appropriate pressure. support body 142
It is possible to move smoothly within the kite rail 144 without rattling. Also, regarding the lower guide rail 145, there is a pressing piece 148 and an adjusting screw 149.
or is attached to perform the same function.

A band-shaped sealing plate 143 preferably made of flexible stainless steel or the like and having anti-rust properties is attached to the inner surface of the support body 142 (see FIGS. 3 and 5), and is attached to the opening 5a' of the side wall 5a. The processing tank is sealed by fitting the seal strips 152 and 153 as seal members provided on the side plates 150 and 151 along the upper and lower sides and the seal plate +43 with appropriate pressure using the adjusting screws 147 and 148. Leakage of the machining fluid 8 within the chamber 5 is prevented, and a complete sealing function is achieved.

The flexible band-shaped sealing plate +43 is also treated with Teflon or the like to reduce friction.

With the above structure, the chain-shaped belt-shaped support body 142 has sufficient strength, so that the thin belt-shaped seal plate 143 can withstand high water head pressure, and when the processing tank 5 and the lower arm 10 move relative to each other, The support body 142 and the flexible seal plate 143 move around the side wall 5b or 5C adjacent to the side wall 5a through which the lower arm of the processing tank is inserted, so that the lower arm IO
The movable range can be secured up to almost the entire width of the processing tank.

When the lower arm 10 and the machining tank 5 move relative to each other, a load is applied to the wire electrode running arm 10a due to the friction of the movement, causing it to bend, causing an error in the position of the wire electrode, and reducing the machining accuracy. In order to prevent
For example a, it is recommended that the sealing mechanism be loosely attached through flexible packing so that the moving load of the sealing mechanism is borne by the machining liquid feeding arms 10b and 10c.

Therefore, in order to hold the lower arm IO in the arm fitting body 141 slidably in the axial direction and in a watertight manner, the wire electrode running arm 10a is equipped with a sealing device 154 as shown in FIG. For the liquid arms 10b and lOc, a sealing device 15 as shown in FIG.
It is recommended to use 5.

That is, in FIG. 6, 10a is a wire electrode running arm;
54a is a sleeve of a sealing device attached to the arm fitting body 141, 154b is an internal tube housed in the sleeve 154a, 154c and 154d are ring-shaped sealing members that come into contact with the outer peripheral surface of the wire electrode running arm 10a, and 154e 154f and 154g are elastic rings, and 154f and 154g are ring-shaped packings made of a flexible member that are interposed between the sleeve 154a and the inner tube 154b and absorb transmission of force between the two. This packing 154f and 15
4g, the arm fitting body 141 and the wire electrode running arm 10a are loosely connected.

On the other hand, in FIG. 7, 10b (or 10c) is the arm for feeding the machining liquid, 155a is the sleeve of the sealing device attached to the arm fitting body 141, and 155C and 155d are the outer peripheral surface of the arm IOb for feeding the machining liquid. The contacting ring-shaped sealing member 155e is an elastic ring. This sealing device is not provided with members corresponding to the packings 154f and 154g in the sealing device shown in FIG. Therefore, the arm fitting body 141 and the machining liquid feeding arm job (and 10c) are firmly connected.

Therefore, the driving force of the seal mechanism 14 during relative movement between the machining tank 5 and the lower arm 10 is transmitted to the machining liquid feeding arm 10 which is firmly connected to the arm fitting body 141.
b and 10c, and the wire electrode running arm 10a, which is loosely connected to the arm fitting body 141 by banks 154f and 154g, is freed from force transmission, ensuring good machining accuracy. It is.

〔Effect of the invention〕

Since the present invention is constructed as described above, in accordance with the present invention, the chain-shaped band-shaped support body 142 has sufficient strength and the seal plate 14 is made of a flexible thin band plate.
Type 3 is capable of withstanding high water head pressure, and machining can be carried out by filling a deep machining tank with a large amount of machining fluid.

Further, when the processing tank 5 and the lower arm 10 are moved relative to each other, the support body 142 moves around the side walls 5b and 5C adjacent to the side wall 5a through which the lower arm of the processing tank is inserted, so that the lower arm is processed. The movable range of the tank can be secured over the entire width of the processing tank.

Furthermore, the arm fitting body 14+ is connected to the processing liquid feeding arm 1.
Firmly attached to 0b and 10c, flexible packing +54 to wire electrode running arm 10a
By gently attaching the wire electrode running arm IOa through the sealing device having f and 154g, it is possible to prevent the load from being applied to the wire electrode running arm IOa when the sealing mechanism is moved. This makes it possible to prevent deterioration in processing accuracy due to bending.

It should be noted that the present invention is not limited to the embodiments described above, but can be freely modified within the scope of the purpose of the present invention, and the present invention can be easily conceived by a person skilled in the art from the above description. It is intended to encompass all possible modifications.

For example, in the present invention, the lower arm penetrates two opposing side walls of the processing tank.
It is also applicable to the wire-cut electrical discharge machining apparatus described in Japanese Patent Publication No. 44, etc., and the structure of the lower arm may be the same as that described in Japanese Patent Publication No. 63-48653, or Japanese Patent Publication No. 1-109025. It is also possible to adopt a structure in which a strong arm cover is disposed around the outer periphery of the lower arm with a spaced gap therebetween, as described in the above publication.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the overall configuration of an immersion machining type wire-cut electrical discharge machining apparatus according to the present invention, and Fig. 2 is a schematic diagram showing the overall configuration of an immersion machining type wire-cut electric discharge machining apparatus according to the present invention.
C- in Figure 4 shows an outline of the sealing mechanism installed in the machining tank of the immersion machining type wire-cut electrical discharge machining equipment.
3 is a perspective view showing details of an embodiment of the sealing mechanism, and FIG. 4 is a sectional view taken along line C, and FIG. 4 is line C-C in FIG. 5 is a cross-sectional view taken along C in FIG. 4 showing details of the sealing mechanism.
6 is a sectional view showing an embodiment of the sealing means between the wire electrode running arm and the arm fitting plate, and FIG. 7 is a sectional view taken along line C. FIG. 3 is a cross-sectional view showing an embodiment of the dark knoll means with plywood. 1 - - - - - Column 2 - - - Head 3 - - - - - - - - - - - - - - X-axis direction moving table 4 - - −−〜− ・−・−−Y axis direction moving table 5−・−・−・ −−1 ・Processing tank 6−−−
・−・～・−・−−−m-Plate stand 7 ・−−−・−・
・・Workpiece 8−・−−−−−−−−1・−Working fluid 9 ・・・−1−−−−−−Upper arm 10−−−−−−−−
Lower arms 11, 12-------Additional head 13・--------Wire electrode 14-----
Tool mechanism 141 --- Arm fitting plate 142 --- Support body 143 --- Knoll plate

Claims (1)

[Scope of Claims] 1) The workpiece (7) is placed in the machining liquid (8) in the machining tank (5).
) and stretched between an upper arm (9) extending from the column (1) onto the processing tank and a lower arm (10) extending into the processing tank through the side wall of the processing tank. In an immersion type wire-cut electrical discharge machining device that performs electrical discharge machining using an electrode (13), the column is inserted into the column through a horizontally long side wall opening (5a') extending in the horizontal direction formed in the side wall (5a) facing the column of the machining tank (5). a lower arm (10) arranged to extend from the lower arm into the processing tank; and a lower arm (10) attached to the outer periphery of the lower arm (10) to hold the lower arm so as to be movable watertight in its axial direction;
an arm fitting plate (141) that is capable of sliding horizontally with respect to the processing tank together with the lower arm along the opening while covering a part of the side wall opening of the processing tank; A large number of vertically elongated strip-shaped plate pieces (142a) having a length are rotatably connected to each other at their longitudinal sides in a chain-shaped band shape,
The plate material piece at one end is attached to one side of the arm fitting plate, and its upper and lower sides are adjacent to the outer periphery of the side wall (5a) provided with the opening (5a') of the processing tank. It is held so as to be slidable along guide rails (144, 145) extending horizontally to the outer periphery of the side walls (5b, 5c), and when the processing tank and the lower arm move relative to each other, the lower arm moves along the side wall of the processing tank together with the arm fitting plate. A pair of support bodies (142) each attached to both sides of the arm fitting plate so as to slide
and a flexible band-shaped seal plate (143) that is attached to the surface of the support body and maintains watertightness with the side wall of the processing tank.
The above-mentioned immersion machining type wire-cut electric discharge machining device is characterized in that it is provided with a sealing mechanism consisting of the following. 2) The lower arm (10) is composed of a wire electrode running arm (10a) and a machining fluid feeding arm (10b) that are arranged close to each other in parallel, and the arm assembly is configured to transport the machining fluid. 2. The immersion machining type wire-cut electric discharge machining apparatus according to claim 1, wherein the immersion machining type wire-cut electric discharge machining apparatus is firmly attached to the arm for running the wire electrode, and is loosely attached to the arm for running the wire electrode through a flexible packing.