KR102605859B1 - Apparatus for processing graphite block - Google Patents

Abstract

The present invention relates to a device for forming a mounting hole for mounting a graphite block in the form of a square pillar to the electrode assembly jig of an electric discharge machining device. More specifically, the transfer unit for transporting the graphite block and the front and back and left and right sides of the graphite block. A positioning bar and support part that aligns the direction position, a flattening part that performs a flattening operation to flatten the bottom of the graphite block, a drill part that forms a hole in the bottom of the graphite block, and a thread in the hole formed in the bottom of the graphite block. It relates to a processing device for a graphite block for electrical discharge machining that can automatically form a mounting hole of the correct shape and size at the exact position at the bottom of the graphite block by simply inserting the graphite block by forming the tab part for forming it integrally with the device. .

Description

Apparatus for processing graphite block for electrical discharge machining

The present invention relates to a processing device for graphite blocks for electrical discharge machining, and more specifically, to an automatic processing device for forming a mounting hole for mounting a graphite block in the form of a square pillar to an electrode assembly jig of an electrical discharge processing device.

Electric Discharge Machining processes materials by melting or vaporizing them using the heat of the spark generated when the positive and negative electrodes of electricity come into contact.

Electrodes for electrical discharge machining are made of brass, graphite, silver-tungsten, copper-tungsten, copper-tungsten, iron, copper, zinc, phosphor bronze, and aluminum.

Among these, electrodes for electrical discharge machining made of graphite have low electrode consumption, excellent discharge stability, can be selected and used depending on the application from rough machining to finishing and ultra-precision machining, and are lightweight and easier to work with than other metal electrodes.

Due to these excellent properties, the use of graphite electrodes as electrodes for electrical discharge machining has recently increased rapidly.

The electrode assembly used in such electrical discharge machining is mounted on the lower part of the head that is driven vertically and horizontally to process the workpiece. In order to combine the electrode block and the electrode assembly jig, the electrode block must first be processed.

However, according to the conventional electrode assembly structure, in order to combine the electrode block and the electrode assembly jig, a method of processing the upper end of the electrode block into an uneven part and then inserting it into the electrode assembly jig and fixing it is adopted, forming the uneven part. In the process, the upper two sides of the electrode block are cut and removed, which not only wastes the relatively expensive electrode block made of graphite, but also the processing of the uneven portion itself also acts as a waste of manpower and time.

In addition, the conventional graphite block processing device had a problem in that the processing accuracy was significantly reduced because the position of the graphite block could not be accurately aligned before the processing operation.

Meanwhile, the prior art regarding a graphite block processing device includes Korean Patent Publication No. 10-2014-0066331.

The present invention is intended to solve the above-mentioned problems, and performs a flattening operation to flatten the lower end of the graphite block with the transfer unit for transferring the graphite block, the alignment bar and support unit for aligning the front, rear, and left and right positions of the graphite block. A flattening part for forming a hole at the bottom of the graphite block, a drill part for forming a hole at the bottom of the graphite block, and a tab part for forming a screw thread in the hole formed at the bottom of the graphite block are formed integrally in the device, so that simply by inserting the graphite block, the accurate The purpose is to provide a processing device for graphite blocks for electrical discharge machining that can automatically form mounting holes of accurate shape and size at the location.

The problem to be solved by the present invention is not limited to the above-mentioned problem, and other technical problems not mentioned will be clearly understood by those skilled in the art from the contents described later.

A processing apparatus for graphite blocks for electrical discharge machining according to the present invention for achieving the above object includes a transfer unit that is formed to be slidably movable along a guide unit and transfers the graphite block; A support body formed on the top of the housing to be movable in the longitudinal direction of the housing; A support portion that is movable in the width direction of the housing along a guide groove formed at the bottom of the support body and aligns the left and right positions of the graphite block and then fixes it; a flattening unit that performs a flattening operation to flatten the lower end of the graphite block fixed by the support unit; A drill part forming a hole at the bottom of the graphite block; and a tab portion forming a thread in the hole at the bottom of the graphite block formed by the drill portion.

At this time, the graphite block processing device further includes a position alignment bar that is formed to be slideable in the longitudinal direction of the housing along the guide groove of the alignment bar body and aligns the front and rear positions of the injected graphite blocks. It is characterized by

In addition, the flattening part is characterized by being formed with a detection sensor that detects the entry of the graphite block fixed to the support part.

The present invention relates to a device for forming a mounting hole for mounting a graphite block in the form of a square pillar to an electrode assembly jig of an electric discharge machining device. A flattening part that performs a leveling operation to flatten the bottom of the alignment bar and support part and the graphite block, a drill part to form a hole in the bottom of the graphite block, and a tab to form a thread in the hole formed in the bottom of the graphite block. By simply inserting the graphite block by forming it integrally with the device, a mounting hole of the correct shape and size can be automatically formed at the exact location at the bottom of the graphite block.

In addition, since the processing of the graphite block is performed inside the housing, dust generated during processing of the graphite block can be prevented from scattering to the outside.

In addition, when the graphite block is inserted, the position alignment bar opens in the longitudinal direction of the housing and then narrows, and the graphite block is inserted and fixed inside, thereby aligning and fixing the front and rear positions of the graphite block. Afterwards, the support part is adjusted to the width of the graphite block. By fixing the graphite block inside after opening, the left and right positions of the graphite block are aligned and fixed, thereby improving the processing accuracy of the graphite block.

In addition, a dust collection device and a collection part are formed at the bottom of the flattening unit, so that dust generated during the flattening operation of the bottom of the graphite block by the flattening unit can be sucked in and collected. Therefore, it is possible to minimize dust scattering inside the housing and adhering to devices formed inside the housing.

In addition, a detection sensor is provided in front of the flattening unit, and the flattening unit operates only when it is detected that the graphite block with its front, rear, and left and right positions aligned is transferred to the flattening unit by the support unit. Therefore, the flattening unit can be operated only during flattening work. The device's power use and dust scattering can be minimized.

In addition, since the drill portion and the tab portion are formed to be driven by one motor, the number of motors required for the device can be minimized.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Figure 1 is a perspective view of a processing apparatus for graphite blocks for electrical discharge machining according to the present invention.
Figures 2 and 3 are diagrams showing the internal configuration of the housing of the processing device for graphite blocks for electrical discharge machining according to the present invention.
Figure 4 is a partial enlarged view of the support portion in the processing device for graphite blocks for electrical discharge machining according to the present invention.
Figure 5 is a partial enlarged view of the support portion and the alignment bar in the processing device for graphite blocks for electrical discharge machining according to the present invention.
Figures 6 and 7 are diagrams for explaining the process of aligning the positions of the graphite blocks in the front-back and left-right directions through the position alignment bar and support in the processing device for graphite blocks for electrical discharge machining according to the present invention.
Figure 8 is a diagram for explaining the driving devices included inside the housing of the drill portion and the tab portion in the processing device for graphite blocks for electrical discharge machining according to the present invention.
Figure 9 is a diagram schematically showing the shape of a graphite electrode block processed through the graphite block processing device for electrical discharge machining according to the present invention.

Preferred embodiments of the present invention will be described in more detail with reference to the attached drawings, but technical parts that are already well-known will be omitted or compressed for brevity of explanation.

Figure 1 is a perspective view of a processing device for graphite blocks for electrical discharge machining according to the present invention, Figures 2 and 3 are diagrams showing the internal configuration of the housing of the processing device for graphite blocks for electrical discharge machining according to the present invention, and Figure 4 is a view showing the internal structure of the housing of the processing device for graphite blocks for electrical discharge machining according to the present invention. Figure 5 is a partially enlarged view of the support part in the processing device for graphite blocks for electrical discharge machining according to the present invention, Figure 5 is a partial enlarged view of the support section and the alignment bar in the processing device for graphite blocks for electrical discharge machining according to the present invention, and Figures 6 and 7 are according to the present invention. It is a drawing to explain the process of aligning the front, rear, and left and right positions of the graphite block through the position alignment bar and the support in the processing device for the graphite block for electrical discharge machining according to the present invention, and Figure 8 is the processing device for the graphite block for electrical discharge machining according to the present invention. is a diagram for explaining the driving devices included inside the housing of the drill portion and the tab portion, and Figure 9 is a diagram schematically showing the form of a graphite electrode block processed through the processing device for graphite blocks for electrical discharge machining according to the present invention. .

Hereinafter, the processing apparatus for graphite blocks for electrical discharge machining according to the present invention will be described in detail with reference to FIGS. 1 to 9.

As shown in Figures 1 to 9, the processing device for graphite blocks for electrical discharge machining (hereinafter referred to as 'processing device for graphite blocks') according to the present invention includes a housing formed on the top of the work table 200 to protect the internal structure. It includes a support 210 formed at the bottom of the work table 200 and the work table 200 to support the work table 200, the housing 100, and the components inside the housing 100, and a graphite layer on one outer side of the housing 100. An inlet 110 through which the block 300 is input is formed, and an outlet 120 through which the processed graphite electrode block 310 is discharged is formed on the other side.

Additionally, a transfer unit 130, a position alignment bar 165, a support unit 160, a drill unit 140, a tab unit 150, and a flattening unit 170 are formed inside the housing 100.

The transfer unit 130 is formed to be able to slide along the guide unit 131 and serves to transfer the graphite block 300 introduced into the inlet 110 in the longitudinal direction of the housing 100.

As shown in FIG. 5, the position alignment bar 165 can slide and move in the longitudinal direction of the housing 100 along the guide groove 167 of the alignment bar body 166, and at the same time can be inserted and moved through the guide groove 167. It is possible to adjust the inner width to suit the size of the injected graphite block 300, which is formed so that it can be drawn out. Accordingly, when the graphite block 300 is input and transferred to the bottom of the support part 160, which will be described later, through the transfer part 130, the position alignment bar 165 is spread in the longitudinal direction of the housing 100, as shown in FIG. 6. After narrowing, the graphite block 300 is inserted and fixed inside, thereby aligning the front and rear positions of the graphite block 300 and then fixing it.

As shown in FIG. 4, the support portion 160 is integrally formed at the bottom of the support body 161, which is formed at the top of the housing 100 to be movable in the longitudinal direction of the housing 100. The support body 161 It is possible to adjust the inner width according to the size of the injected graphite block 300 by being movable in the width direction of the housing 100 along the guide groove 162 formed at the bottom of the. At this time, as the motor 168 formed on one side of the housing 100 is driven, the support body 161 is connected to the rotation axis of the motor 168 and rotates simultaneously with the guide rail 164 by the ball screw 163. It moves in the longitudinal direction of the housing 100.

Accordingly, when the graphite block 300 is input and transported to the bottom of the support part 160 through the transfer part 130, the position alignment bar 165 first aligns the front and rear positions of the graphite block 300, and then as shown in FIG. 7 As shown, the support portion 160 is opened in the width direction of the housing 100 to match the width of the graphite block 300 in which the front and rear positions are aligned, and then narrowed, thereby inserting and fixing the graphite block 300 on the inside to form a graphite block ( 300) in the left and right directions and then fix it. At this time, when the fixation of the graphite block 300 by the support part 160 is completed, the position alignment bar 165 is inserted into the guide groove 167 of the alignment bar body 166, and the support part 160 is connected to the graphite block 300. It is allowed to move in the longitudinal direction of the housing 100 while being fixed.

Afterwards, for machining work through the flattening part 170, the drill part 140, and the tab part 150, the support body 161 moves in the longitudinal direction of the housing 100 to remove the graphite fixed by the support part 160. The block 300 is transferred. At this time, since both inner surfaces of the support portion 160 in contact with both sides of the graphite block 300 are formed flat, the lower surface of the graphite block 300 can be fixed in a state parallel to the ground, forming a flattening portion 170 to be described later. During the flattening operation, the bottom surface of the graphite block 300 can be cut flat.

The flattening unit 170 is a pair of rotating cylindrical cutters and is provided to flatten the bottom of the graphite block 300 fixed by the support part 160, and a dust collector 171 is installed at the bottom of the flattening unit 170. And a collection unit 180 is formed to absorb and collect dust generated during the flattening operation of the bottom of the graphite block 300 by the flattening unit 170. Accordingly, it is possible to minimize dust scattering inside the housing 100 and adhering to devices formed inside the housing 100.

In addition, as shown in FIGS. 5 to 7, a detection sensor 190 is provided in front of the flattening portion 170, and the graphite block 300, whose front-back and left-right positions are aligned, is operated by the support portion 160. Since the flattening unit 170 operates only when the transfer to 170) is detected, the flattening unit 170 can be operated only during the flattening operation, thereby minimizing the power use of the device and scattering of dust.

The drill portion 140 is provided to form a hole at the bottom of the graphite block 300 fixed by the support portion 160 as shown in FIGS. 2 and 3, and the tab portion 150 is formed by the drill portion 140. It is provided to form a screw thread in the hole at the bottom of the graphite block 300 and ultimately form a mounting hole at the bottom of the graphite block 300. At this time, although not shown in the drawing, the drill part 140 and the tab part 150 are also equipped with a sensor (not shown) like the flattening part 170, so that the graphite block 300 is connected to the drill part 140 by the support part 160. And because the drill unit 140 and the tab unit 150 operate only when it is detected that something has been transferred to the top of the tab unit 150, power use of the device and scattering of dust can be minimized.

Meanwhile, driving devices for operating the drill part 140 and the tab part 150 are formed inside the driving device housing 500, and as shown in FIG. 8, the upper plate 521 and the lower plate 522 are It is formed as one piece, and a drive motor 510 is fixedly formed at the bottom of the lower plate 522.

The drive motor 510 is configured to rotate the drill unit 140 and the tab unit 150, and includes the rotation axis 511 of the drive motor 510 and the rotation axis 141 of the drill unit 140 and the tab unit 150. , 151), a plurality of guide fences 531 are formed, a plurality of guide fences 531 are formed on the rotation axis 511 of the drive motor 510, and the rotation axis 141 of the drill part 140 and the tab part 150, A plurality of guide fences 531 formed in 151 are connected through a belt 532.

Therefore, when the rotation axis 511 of the drive motor 510 rotates, rotational force is transmitted to the rotation shafts 141 and 151 of the drill unit 140 and the tab unit 150 through the guide fence 531 and the belt 532, thereby simultaneously It rotates.

At this time, when the rotation axes 141 and 151 of the drill unit 140 and the tab unit 150 rotate, the lifting axes 142 and 152 of the drill unit 140 and the tab unit 150 formed on the upper ends of the rotation shafts 141 and 151, respectively. ) also rotates at the same time, causing the drill part 140 and the tab part 150 to rotate.

In addition, a plurality of cylinders 540 are fixedly formed at the bottom of the upper plate 521, and each cylinder 540 is formed to be movable along the cylinder axis 541.

Therefore, when the cylinder 540 rises or falls along the cylinder axis 541, the upper plate 521 also rises or falls at the same time, and accordingly, the drill portion 140 and the tab portion formed at the top of the upper plate 521 As the lifting shafts 142 and 152 of 150 rise or fall, the drill unit 140 and the tab unit 150 rise or fall.

At this time, the lifting shafts 142 and 152 of the drill part 140 and the tab part 150 are formed in a cylindrical shape with a long groove formed in the longitudinal direction on the inside, and the inner groove is formed in a polygonal shape, and the drill part 140 and The rotation axes 141 and 151 of the tab portion 150 are inserted into the polygonal grooves inside the lifting shafts 142 and 152, so that the lifting and lowering shafts 142 and 152 and the rotation axes 141 and 151 can rotate together. At the same time, the lifting shafts 142 and 152 can move up and down on the rotating shafts 141 and 151. Accordingly, as the upper plate 521 rises, the lifting shafts 142 and 152 of the drill unit 140 and the tab unit 150 are pushed up, causing the drill unit 140 and the tab unit 150 to rise.

Hereinafter, we will look in detail at the processing process of the graphite block 300 using the graphite block processing device according to the present invention.

First, when the graphite block 300 is placed on the top of the transfer unit 130, the transfer unit 130 slides along the guide unit 131 and enters the inside of the housing 100 through the inlet 110 of the housing 100. Move to the bottom of the support part 160.

When the graphite block 300 is transferred to the bottom of the support unit 160 through the transfer unit 130, the position alignment bar 165 is pulled out from the guide groove 167 of the alignment bar body 166 and placed in the housing, as shown in FIG. (100) is opened in the longitudinal direction and then narrowed, and the graphite block 300 is inserted and fixed inside, thereby aligning the front and rear positions of the graphite block 300 and then fixing it.

Thereafter, the support portion 160 is opened in the width direction of the housing 100 to match the width of the graphite block 300 in which the front and rear positions are aligned, and then narrowed, thereby inserting and fixing the graphite block 300 inside. Align the left and right positions and fix them. At this time, when the fixation of the graphite block 300 by the support part 160 is completed, the position alignment bar 165 is inserted into the guide groove 167 of the alignment bar body 166, and the support part 160 is connected to the graphite block 300. It is allowed to move in the longitudinal direction of the housing 100 while being fixed.

Next, when the support body 161 moves in the longitudinal direction of the housing 100 and transfers the graphite block 300 fixed by the support part 160 toward the flattening part 170, the detection sensor 190 detects the graphite block 300. Upon detecting that the block 300 has been transferred to the flattening unit 170 by the support unit 160, the flattening unit 170 is driven to cut the bottom surface of the graphite block 300 flat.

At this time, since both inner surfaces of the support part 160 in contact with both sides of the graphite block 300 are formed flat, the bottom surface of the graphite block 300 can be fixed in a state parallel to the ground, so that it can be fixed through the flattening part 170. During the flattening operation, the bottom surface of the graphite block 300 can be cut flat.

In addition, the detection sensor 190 allows the flattening unit 170 to operate only during the flattening operation, and dust generated during the flattening operation is collected through the dust collector 171 and the collection unit 180 at the bottom of the flattening unit 170. Since it can be sucked and collected directly from the device, the device's power use and scattering of dust can be minimized.

When the flattening operation is completed, the support body 161 continues to move in the longitudinal direction of the housing 100 and transfers the graphite block 100 fixed by the support part 160 to the drill part 140 to produce graphite as shown in FIG. 9. A hole is formed at the bottom of the block 300.

Thereafter, the support body 161 continues to move in the longitudinal direction of the housing 100 and transfers the graphite block 100 fixed by the support part 160 to the tab part 150 to remove the graphite formed by the drill part 140. A thread is formed in the hole at the bottom of the block 300 to finally form a mounting hole at the bottom of the graphite block 300.

When the graphite block 300 is inserted as described above, the position alignment bar 165 is opened in the longitudinal direction of the housing 100 and then narrowed, thereby fixing the graphite block 300 inside and adjusting the front and rear positions of the graphite block 300. After aligning and fixing, the support part 160 is spread to match the width of the graphite block 300, and then the graphite block 300 is inserted and fixed inside, thereby aligning the left and right positions of the graphite block 300 and fixing it. Thus, when the graphite block 300 is moved a certain distance with the front, rear, and left and right positions accurately aligned, the exact center of the horizontal bottom of the graphite block 300 is located directly above the drill unit 140, and in this state, it is installed. Since the ball is formed, the mounting hole can be formed at the exact location at the bottom of the graphite block 300.

The graphite electrode block 310 with the completed mounting hole formed is discharged through the discharge port 120.

The graphite electrode block 310, which has been processed through the above process and has a mounting hole, is mounted on the electrode assembly jig 400 through screws, bolts, etc., as shown in FIG. 9.

In the end, the processing device for graphite blocks for electrical discharge machining according to the present invention includes a conveying part for transporting graphite blocks, a positioning alignment bar and support parts for aligning the positions of the graphite blocks in the front, rear, and left and right directions, and a flattening operation to flatten the bottom of the graphite blocks. A flattening part that performs a flattening part, a drill part for forming a hole at the bottom of the graphite block, and a tab part for forming a thread in the hole formed at the bottom of the graphite block are integrated into the device, so that just by inserting the graphite block, the bottom of the graphite block is formed. A mounting hole of the correct shape and size can be automatically formed at the correct location.

In addition, since the processing of the graphite block is performed inside the housing, dust generated during processing of the graphite block can be prevented from scattering to the outside.

In addition, when the graphite block is inserted, the position alignment bar opens in the longitudinal direction of the housing and then narrows, and the graphite block is inserted and fixed inside, thereby aligning and fixing the front and rear positions of the graphite block. Afterwards, the support part is adjusted to the width of the graphite block. By fixing the graphite block inside after opening, the left and right positions of the graphite block are aligned and fixed, thereby improving the processing accuracy of the graphite block.

In addition, a dust collection device and a collection part are formed at the bottom of the flattening unit, so that dust generated during the flattening operation of the bottom of the graphite block by the flattening unit can be sucked in and collected. Therefore, it is possible to minimize dust scattering inside the housing and adhering to devices formed inside the housing.

In addition, a detection sensor is provided in front of the flattening unit, and the flattening unit operates only when it is detected that the graphite block with its front, rear, and left and right positions aligned is transferred to the flattening unit by the support unit. Therefore, the flattening unit can be operated only during flattening work. The device's power use and dust scattering can be minimized.

In addition, since the drill portion and the tab portion are formed to be driven by one motor, the number of motors required for the device can be minimized.

As described above, the specific description of the present invention has been made by way of examples with reference to the accompanying drawings, but since the above-described embodiments are only explained by referring to preferred examples of the present invention, the present invention is limited to the above-described embodiments. It should not be understood as being possible, and the scope of rights of the present invention should be understood in terms of the claims and equivalent concepts described later.

100: housing
110: Inlet
120: outlet
130: transfer unit
131: Guide part
140: drill part
141: Drill unit rotation axis
142: Drill unit lifting shaft
150: tab part
151: Tab portion rotation axis
152: Tab part lifting shaft
160: support part
161: support body
162: Guide home
163: Ball screw
164: Guide rail
165: Position alignment bar
166: Alignment bar body
167: Guide home
168: motor
170: Flattening part
171: Dust collection device
180: collection department
190: detection sensor
200: workbench
210: support
300: Graphite block
310: Graphite electrode block with mounting holes formed
400: Electrode assembly jig
500: Drive housing
510: Drive motor
511: rotation axis
521: upper plate
522: Lower plate
531: Guide fence
532 : belt
540: cylinder
541: cylinder axis

Claims (3)

A transfer unit that is formed to slide along the guide unit and transfers the graphite block;
A support body formed on the top of the housing to be movable in the longitudinal direction of the housing;
It is formed to be able to slide in the longitudinal direction of the housing along the guide groove of the alignment bar body and at the same time to be able to be drawn in and out through the guide groove of the alignment bar body to align the front and rear positions of the injected graphite block. Position alignment bar;
A support portion that is movable in the width direction of the housing along a guide groove formed at the bottom of the support body and aligns the left and right positions of the graphite block and then fixes it;
a flattening unit that performs a flattening operation to flatten the lower end of the graphite block fixed by the support unit;
A drill part forming a hole at the bottom of the graphite block; and
It is formed to include a tab part forming a thread in the hole at the bottom of the graphite block formed by the drill part,
When the graphite block is input and transferred to the bottom of the support unit through the transfer unit, the position alignment bar is pulled out from the guide groove of the alignment bar body, widened in the longitudinal direction of the housing, and then narrowed to fix the graphite block inside. Align and fix the front and rear positions of the graphite blocks,
The support portion is opened in the width direction of the housing according to the width of the graphite block whose front and rear positions are aligned by the position alignment bar, and then narrowed, thereby aligning the left and right positions of the graphite block by inserting and fixing the graphite block inside. After fixing,
When the fixation of the graphite block by the support part is completed, the position alignment bar is inserted into the guide groove of the alignment bar body so that the support part can move in the longitudinal direction of the housing while fixing the graphite block,
When the graphite block is moved to the drill part and the tab part in a state in which the graphite block is fixed by the support part with its front and rear and left and right positions aligned by the position alignment bar and the support part, the exact center of the horizontal bottom surface of the graphite block is A processing device for a graphite block for electrical discharge machining, which is located at the top of the drill portion and the tab portion and is capable of forming an attachment hole at an exact position at the bottom of the graphite block.
delete According to paragraph 1,
A processing device for graphite blocks for electrical discharge machining, characterized in that a detection sensor for detecting the entry of the graphite block fixed to the support part is formed in the flattening part.

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