KR101571680B1 - Apparatus of opening and closing dual door for work tank of electric discharge machine - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double door opening / closing apparatus for an electric discharge machining tank. More particularly, the present invention relates to a double door provided in a machining tank of an immersion type wire electric discharge machine and a compact opening and closing apparatus for efficiently opening and closing the door.

The present invention relates to a double door opening / closing apparatus for an electric discharge machining tank, comprising: a double door including a lower door member and an upper door member disposed on one side of the processing tank; And the door lifting mechanism is a link-actuator mechanism, and the door lifting mechanism is a link-actuator mechanism in which the movement radius of the link-actuator mechanism does not deviate from the other side surface during a lifting operation A double door opening / closing device for a processing tank for electric discharge machining is provided.

Electric discharge machine, processing tank, double door, opening / closing device

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double door opening /

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double door opening / closing apparatus for an electric discharge machining tank. More particularly, the present invention relates to a double door provided in a machining tank of an immersion type wire electric discharge machine and a compact opening and closing apparatus for efficiently opening and closing the door.

Generally, electric discharge machining refers to a method of applying a high voltage to both sides in a state where a tool and a workpiece are approaching each other, causing discharge to occur, and processing the material to be processed by using energy generated at this time. Discharge machining can be roughly classified into die discharge machining using a formed electrode and wire discharge machining using a wire.

Wire discharge machining is a method of machining a shape of a workpiece by applying a positive current to a workpiece to be a conductor and applying a negative current to the tightly held wire to generate a pulse discharge between the wire and the workpiece. Such wire discharge machining is particularly suitable for machining relatively hard materials such as cemented carbide, machining of metal parts and machine parts requiring high precision, and provides a smooth machined surface with a higher surface roughness than other machining methods such as cutting .

The wire electric discharge machine used for the wire electric discharge machining is distinguished largely by the injection type and the immersion type. In the injection type, the work is proceeded in a state in which the work piece is not immersed in the work piece. In the immersion type, The processing accuracy is improved by processing.

Therefore, the immersion-type wire electric discharge machining apparatus requires a machining tank which serves as a water tank for holding the machining fluid. The machining tank is required to have a door for inserting and discharging the work material into and out of the machining tank.

2. Description of the Related Art Generally, a door used in the past has a door formed by a single panel on the front surface of a processing tank, and has a structure for sliding the door in the vertical direction. In the lower part of the processing tank, a table for supporting the processing tank, a table for moving in the x and y directions at the time of processing, and a bed for supporting the table are located. In order to avoid interference with these structures, And is limited within the vertical length.

Therefore, in order to secure the moving space of the door, the length of the processing tank in the vertical direction tends to be long. This causes a problem that the electric discharge machine is unnecessarily enlarged and a large amount of processing liquid is required in the processing step. On the other hand, if the size of the machining tank is kept compact, the moving distance of the door in the up and down direction becomes short, which makes it difficult to insert and receive the materials to be processed.

Similarly, since the opening and closing device for opening and closing the door can also cause interference with the surrounding structures, it is necessary to make the size of the opening and closing device compact.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method of installing a door in a machining tank of a submerged wire electric discharge machine, And to provide a compact opening and closing apparatus.

In order to achieve the above object, the present invention provides a double door opening / closing apparatus for a machining tank for an electric discharge machining machine, comprising: a lower door member disposed on one side of the processing tank and movable in a vertical direction; And a lower door member disposed on the other side of the lower surface of the processing tank and having an upper door member slidable in the vertical direction with respect to the lower door member, A second link member, one end of which is connected to the other end of the first link member and the other end of which is rotatably attached to the upper door member, and a second link member having one end rotatable at another point on the other side And the other end is rotatably connected to a point on the second link member, and the double door Wherein the door lifting mechanism is a link-actuator mechanism, and the moving radius of the link-actuator mechanism does not deviate from the other side surface during a lifting operation. The present invention provides a double door opening / closing device for a vehicle.

In the present invention, it is preferable that the first link member has a bar shape and the second link member has an upwardly curved convex shape.

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Further, in the present invention, it is preferable that the upper door member includes a door panel accommodated in the lower door member, a door panel provided on both side surfaces of the door panel so as to protrude from the side surface of the lower door member, Wherein the lower door member includes a front and rear panel having a "? &Quot; -shaped shape, and a bracket connected to an upper edge of the front and rear panels, And a lower stopper panel connected to a lower edge of the front and rear panels and restricting downward movement of the door panel of the upper door member.

By using the double door opening / closing apparatus for the processing tank for electric discharge machining apparatus according to the present invention, it is possible to keep the size of the apparatus compact while ensuring a sufficient elevation distance of the door.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a double door opening / closing apparatus for an electric discharge machining tank according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view schematically showing a wire electric discharge machine equipped with a double door opening / closing device according to the present invention. The electric discharge machine 1 includes a bed 10, a table 11 installed in front of the upper surface of the bed 10 and moving in the x and y directions in the processing step, a processing tank 12 attached and supported on the table 11, A rear frame 13 provided at the rear of the upper surface of the bed 10 and a head 14 installed at the front of the rear frame 13 and a control panel 15 attached to the head 14. [ A footrest 16 may be installed on the front surface of the bed 10 so that the worker can help the work material (not shown) into and out of the processing tank 12. [

The table 11 is placed on the upper surface of the bed 10 and can be translationally moved in the x-y direction (front-back, left-right direction) by an x-axis driving device and a y-

In the processing tank 12, there is provided a work table 21 for fixing the material to be processed so as not to move during processing. As shown in FIG. 1, only one workbench 21 may be provided, or a plurality of workbenches 21 may be installed. For example, one on each side of the processing tank 12. As shown in the drawings, the work table 21 may have a rectangular shape as viewed from the upper surface, and may have a "C" shape or a "C" shape in consideration of the shape of the material to be processed and other processing conditions. The processing tank 12 may be provided with a filter (not shown) for filtering the processing liquid that flows into the processing tank 12. The detailed configuration of the processing tank 12 will be described later.

The rear frame 13 is provided with a column, a U-slide, and a V-slide, which support the head 14 so as to be movable in the up and down direction. The combination of these structures and the x- Processing becomes possible.

The head 14 is provided with a wire feeding device for feeding a wire during electric discharge machining. The wire conveying device includes an upper arm 31 extending downward from the upper portion of the processing tank 12 and guiding the wire and a lower arm 31 projecting into the processing tank 12 from the rear side of the processing tank 12, (Not shown). The wire is held in tension in the vertical direction between the upper arm 31 and the lower arm, and the wire is subjected to discharge processing while being in contact with the work piece fixed to the work table 21. [

Hereinafter, the processing tank according to the present invention will be described in detail with reference to FIGS. 2A and 2B. FIG. 2A shows a machining tank with a front cover, and FIG. 2B shows a machining tank with a front cover removed.

As shown in the drawing, the front surface of the processing tank 12 is provided with a double door 22 serving as a cash-in / out passage for the material to be processed, and a front cover 24 covering both side portions and bottom portions of the double door 22 And a door lifting mechanism 23 for vertically moving the double doors 22 is provided on both side surfaces of the processing tank 12. A sliding plate 25 is provided on the rear surface of the processing tank 12. The sliding plate 25 is provided with an opening 26 into which a lower arm (not shown) is inserted.

The sliding plate 25 is slidable in the left and right directions with respect to the main body of the machining tank 12 while maintaining the seal and the lower arm is movable in the forward and backward directions y Respectively. Therefore, even if the machining tank 12 placed on the table 11 (see FIG. 1) during the machining process moves in the front, rear, left, and right directions, the seal state can be maintained.

On the lower side of one side of the processing tank 12, there is provided a channel 27 for discharging the processing liquid. As the working fluid, a liquid which does not show conductivity can be used. In general, water is used in consideration of economy.

The double door 22 is composed of an upper door member 100 and a lower door member 110. The upper door member 100 and the lower door member 110 are both vertically movable and the upper door member 110 is slidably installed with respect to the lower door member 110. On both sides of the front surface of the processing tank 12, a door guide member 28 serving as a guide for lifting the upper door member 100 and the lower door member 110 is installed.

Hereinafter, a double door according to the present invention will be described in detail with reference to FIGS. 3A to 3C. Fig. 3A shows an upper door member, Fig. 3B shows a lower door member, and Fig. 3C shows a state in which an upper door member and a lower door member are combined.

The upper door member 100 includes a door panel 101 accommodated in the lower door member 110 and brackets (not shown) provided on the side surfaces of the lower door member 110 at both sides of the door panel 101 102). The door panel 101 is thin enough to be inserted between the front panel 111 and the rear panel 112 of the lower door member 110 to be described later. The bracket 102 extends outward from the side surface of the door panel 101 and is bent at a right angle to the back surface of the processing tank. A pin hole 103 is provided near the end of the bent bracket 102. The pin hole 103 is connected to a second link member 130 of the door lifting mechanism 23, which will be described later, through a pin (not shown).

The lower door member 110 includes a front panel 111 and a rear panel 112 each having a shape of a letter and two front doors 111 and 112 respectively connected to upper edges of the front panel 111 and the rear panel 112 An upper stopper panel 113 and a lower stopper panel 114 connected to lower corners of the front panel 111 and the rear panel 112. [

3C, the upper door member 100 is received in the lower door member 110, and is slid only in the vertical direction in the inner space thereof. The upper stopper panel 113 of the lower door member 110 has a function as a stopper for restricting upward movement of the upper door member 110 and the lower stopper panel 114 of the lower door member 110 has a function as a stopper And has a function as a stopper for regulating the downward movement of the member 110. [

The door lifting mechanism according to the present invention will be described with reference to Figs. 2A and 2B.

The door lifting mechanism 23 is a link-actuator mechanism comprising a plurality of links and actuators. A total of two door lifting mechanisms (23) are disposed on both sides of the processing tank (12), so that force is uniformly transmitted to both sides of the door during the elevating operation of the door. In addition, the movement radius of the door lifting mechanism (23) during the lifting operation of the door must not deviate from the side area of the processing tank (12) so as not to cause interference with structures provided around the processing tank (12).

As shown, the door lifting mechanism 23 includes a first link member 120, a second link member 130, and an actuator 140. One end of the first link member 120 is rotatably attached to a point on the side surface of the processing tank 12 by a pin (not shown), and the other end of the first link member 120 is connected to a pin (not shown) And is connected to one end of the second link member 130. The other end of the second link member 130 is rotatably attached to the pin hole 103 formed in the bracket 102 of the upper door member 100 by a pin (not shown).

As shown in the drawing, the first link member 120 is a thin and long member in the form of a bar, and two pin holes are provided at both ends thereof to which the pins can be connected. In addition, the second link member 130 is a thin, elongate member that is curved convexly upward, and three pin holes are provided at one point between both ends and both ends thereof, to which pins can be connected.

The actuator 140 includes an actuator body 141 and an arm 142 slidingly moved with respect to the body 141. The lower end of the actuator body 141 is rotatably attached to one point of the processing tank 12 by a pin (not shown), and the upper end of the arm 142 is connected to a second link Is rotatably connected to a pin hole provided between both ends of the member (130).

Hereinafter, the elevating operation of the double door opening / closing apparatus according to the present invention will be described in detail with reference to Figs. 4A to 4C.

 4A shows a state in which the upper door 100 and the lower door 110 are completely opened so that the worker can put the materials to be processed into the processing tank 12. In this state, the lower surface of the upper door 100 is in contact with the lower stopper panel 114 of the lower door 110. The actuator 140 at this time is in a contracted state, that is, the arm 142 is completely housed in the actuator body 141. On the other hand, the height of the upper surface of the upper door 100 is set to be lower than the height of the work table 21 so that the worker can conveniently raise or lower the heavy work material to the work table 21 (see Fig. 1) .

In this state, when a predetermined driving force is applied to the actuator 140, the arm 142 protrudes outward from the actuator body 142. As a result, the other end of the second link member 130 is raised by the connection of the link, so that the upper door 100 connected to the other end of the second link member 130 by the bracket 102 is also raised. At this time, the lower door 110 is kept in a state of being opened by its own weight, that is, the door is lowered. When the upper door 100 is subsequently raised, the upper surface of the upper door 100 is brought into contact with the upper stopper panel 113 of the lower door 110. The state at this time is shown in Fig. 4B.

In this state, when the arm 142 of the actuator 140 further protrudes outward from the actuator body 142, the upper door 100 is raised and the contact between the upper door 100 and the lower door 110 So that the lower door 110 is also raised. This operation takes place until the arm 142 of the actuator 140 protrudes to the maximum extent, which is shown in Fig. 4C. 4C shows a state in which the upper door 100 and the lower door 110 are completely closed.

Although the upward movement of the double door has been described above, the downward movement is performed in the reverse order to the upward movement, so that the description will be omitted. 4A to 4C, it can be seen that the movement radius of the door lifting mechanism is kept to a minimum. That is, the radius of motion of the door lifting mechanism throughout the lifting operation does not deviate from the side area of the processing tank, and interference between the door lifting mechanism and the other structure is prevented.

While the present invention has been described by way of example and in terms of the accompanying drawings, it is to be understood that such embodiments are to be considered as illustrative and not restrictive. Modifications, additions, and modifications may be made to equivalents within the scope of the embodiments. Of course.

1 is a perspective view schematically showing a wire electric discharge machine equipped with a double door opening / closing device according to the present invention.

2A and 2B are perspective views showing a processing tank having a double door opening / closing device according to the present invention, wherein FIG. 2A shows a processing tank having a front cover, and FIG. 2B shows a processing tank with a front cover removed.

3A to 3C are perspective views showing a double door according to the present invention, in which FIG. 3A shows an upper door member, FIG. 3B shows a lower door member, and FIG. 3C shows a state in which an upper door member and a lower door member are combined .

FIGS. 4A to 4C are a side view and a front view, respectively, illustrating the elevating operation of the double door opening / closing device according to the present invention.

Description of the Related Art

11: Table 12: Processing tank

22: double door 23: door lifting mechanism

100: upper door member 110: lower door member

120: first link member 130: second link member

140: Actuator

Claims (4)

A double door opening / closing apparatus for an electric discharge machining tank (12) A lower door member 110 disposed on one side of the processing tank 12 and movable in the vertical direction and a lower door member 110 disposed on the upper side of the lower door member 110, A double door 22 including a slidable upper door member 100, A first link member 120 disposed on the other side of the processing tank 12 in contact with one side of the processing tank 12 and having one end rotatably attached at one point on the other side, A second link member 130 connected to the other end and rotatably attached to the upper door member 100 at one end and a second link member 130 having one end rotatably attached to another point on the other side, And a door lifting mechanism (23) having an actuator (140) rotatably connected to one point on the door (130) and opening / closing the double door (22) Wherein the door lifting mechanism (23) is a link-actuator mechanism, and the movement radius of the link-actuator mechanism does not deviate from the other side surface during a lifting operation. delete The method according to claim 1, Wherein the first link member (120) is in the form of a bar and the second link member (130) is curved in an upward convex shape. The method according to claim 1, The upper door member 100 includes a door panel 101 accommodated inside the lower door member 110 and a door panel 101 projecting from both sides of the door panel 101 on the side surface of the lower door member 110. [ And a bracket 102 rotatably connected to the other end of the second link member 130, The lower door member 110 is connected to the upper edges of the front and rear panels 111 and 112 and the upper and lower door members 100 and 112, An upper stopper panel 113 for restricting upward movement of the door panel 101 of the upper door member 100 and a door panel 101 of the upper door member 100 connected to lower corners of the front and rear panels 111, And a lower stopper panel (114) for restricting the downward movement of the lower door opening and closing mechanism.

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