KR101116219B1 - A clamping device for spsrk erosion - Google Patents

Abstract

PURPOSE: A clamping device of a workpiece combining jig capable of being exchanged partially, which facilitates the assembly and disassembly of jig and clamping chuck using elevating bolts, is provided to prevent damage to a groove and position decision projection by combining the groove of a jig with a lifting bolt. CONSTITUTION: A clamping device of a workpiece combining jig capable of being exchanged partially comprises a clamping chuck including a body(201) and a separation block(209). The body has a seating groove(207) and a first penetration hole(203). The separation block separates from the seating groove from the bond. The separation block has a third penetration hole(206) upon the upper side upon multiple position decision projections, and a top surface center. Multiple position decision projections are combined in each groove. An elevation bolt(210) is combined in the first and third penetration hole to slide.

Description

A clamping device for spsrk erosion

The present invention relates to a clamping device for a workpiece joining jig that can be partially replaced, in particular, the structure has been improved to improve the processing quality, to facilitate assembly and disassembly, and to easily replace parts that are easily worn and contaminated The present invention relates to a clamping device for a workpiece joining jig that can be replaced.
The present invention also relates to a clamping device for a workpiece joining jig that is capable of improved part replacement so that the assembly can be quickly assembled without damaging the jig or clamping chuck when assembling the jig to the clamping chuck.

In general, electric discharge machining is a method of precisely processing materials having a very high hardness such as cemented carbide, quenched high speed steel, and heat resistant steel.

Referring to FIG. 1, the electric discharge machining is performed by applying a voltage by separating the processing electrode 11 and the workpiece 12 at predetermined intervals from an insulating liquid 13 such as kerosene, and the process electrode 11 and the workpiece 12. A discharge occurs at the projections, and the discharge causes the surface of the liquid and the workpiece 12 to melt and evaporate to form a predetermined shape 14 corresponding to the processing electrode 11.

Therefore, when the workpiece 12 is discharged and processed into the shape of the target workpiece to be processed, the desired shape of the workpiece can be manufactured.

On the other hand, in the electric discharge machining, rough machining of the workpiece to a certain shape first, and then machining the electrode corresponding to the processing shape of the workpiece. At this time, the electrode is processed by a CNC machine tool, the electrode thus processed is fixed to the electric discharge machine is to precisely process the workpiece in the shape of the electrode by the electrical discharge generated in the workpiece in the electrolyte solution.

2 to 4, this shows a clamping device for processing the electrode 10 as a workpiece for processing by installing in a CNC machine tool, jig 20 and clamping chuck for fixing the electrode 10 30 is shown.

A coupling groove 21 for coupling the electrode 10 is formed at one side of the jig body 20a, and a wrench bolt 22 is coupled to the coupling groove 21 to the side of the coupling groove 21 to be coupled to the coupling groove 21. The electrode 10 can be fixed.

On the other side of the jig body 20a, a jig leg 20b is formed, and the first coupling plate 24 and the second coupling plate 26 are coupled between the jig leg 20b and the jig body 20a. . The second coupling plate 26 is for spaced apart between the jig body 20a and the first coupling plate 24, and the first coupling plate 24 is clamped for coupling the jig 20 to the electric discharge machining machine. Coupled to the chuck 30.

3 and 4, one end of the shaft 8 is coupled to the hollow 27 formed in the center of the jig body 20a, and the other end of the coupling hole of the clamping chuck 30 having the coupling protrusion 31 formed therein ( 32).

When the lever 35 connected to the clamping chuck 30 is pulled, the distance between the clamping chuck 30 and the jig 20 is narrowed by a ball BALL (not shown) which is fixed while the shaft 8 is fixed. At this time, the clamping chuck 30 and the jig 20 are tightly coupled while the gap between the clamping chuck 30 and the jig 20 is maintained by the jig leg 20b.

At this time, the coupling protrusion 31 is guided and coupled to the groove 24a formed in the first coupling plate 24.

However, the clamping device as described above has the following problems.

First, contaminants are deposited on the engaging projection 31 of the clamping chuck during small machining, or the engaging projection 31 is worn by frequent detachment of the jig 20 with the groove 24a. By lowering the quality of processing of processing requiring precision workability.

In this case, if the entire clamping chuck is replaced, an economic burden arises.

Second, after assembling one end of the shaft 8 to the jig 20, the other end of the shaft 8 must be coupled to the clamping chuck 30, which is cumbersome for assembly work.

Third, in order to connect the jig 20 and the clamping chuck 30, a separate shaft 8 is required, so the parts management is cumbersome.

Fourth, since a fine gap is generated at the connecting portion of the lever 35 and the shaft 8, fine vibration is generated due to external vibration during processing, a defect occurs in the machining that requires precise machining.

Fifth, it is inconvenient because the separation of the lever 35 is undesired when washing after processing.

Korea Utility Model Registration No. 20-0165311 Korea Utility Model Registration No. 20-0445279 Korea Patent Registration No. 10-0879512

The present invention was created in order to solve the above problems, partly replaceable clamping of the jig for electric discharge machining is improved in its structure so that only the parts of the clamping chuck exposed to the electrolyte during discharge machining can be easily replaced. The object is to provide a device.

Another object of the present invention is to provide a partially replaceable clamping device for an electric discharge machining jig that can be easily assembled to a clamping chuck.

Another object of the present invention is to provide a partially replaceable clamping device for an electric discharge machining jig to clamp the jig to a clamping chuck with a stronger clamping force than the conventional one to minimize the vibration of the electrode due to external vibration and improve the processing quality. have.

It is still another object of the present invention to provide a partially replaceable clamping device for a jig for electric discharge machining which is easy to disassemble and thus facilitates cleaning after electric discharge machining.
It is a further object of the present invention to provide a partially replaceable clamping device for a jig for electric discharge machining that is improved to be assembled quickly without damaging the jig or clamping chuck when assembling the jig to the clamping chuck.

The present invention to achieve the above object in the clamping device of the workpiece coupling jig for detachably coupling the jig to which the workpiece is coupled to the clamping chuck,

The jig is formed on the upper surface and the coupling groove to which the workpiece is coupled, the screw hole formed in the center of the lower surface and the female thread formed, a plurality of jig legs coupled to the edge of the lower surface, the coupling plate is coupled to the lower surface formed with a plurality of grooves Equipped with

The clamping chuck has a body having a seating groove formed on an upper surface thereof, and a separation block coupled to and detachably coupled to the seating groove;

The separation block has a plurality of positioning projections are coupled to each of the grooves on the upper surface, the third through-hole penetrated up and down is formed in the central portion of the upper surface;

The body of the clamping chuck is formed with a first through hole communicating with the third through hole, the first through hole and the third through hole is slidably coupled so that the top of the outgoing of the separation block is screwed to the screw hole It is provided with a lifting bolt to be coupled, and lifting means for screwing or separating the screw hole by rotating and lifting the lifting bolt,

The lifting means is; The lifting bolt is formed with a bolt portion formed with a male screw on the top and a polygonal rod portion formed with a polygonal surface on the bottom,

A first through hole penetrates up and down in the center of the body and is coupled to the lifting bolt so as to be protruded, and a second through hole communicating with the first through hole is formed at a side portion of the body.

A rotation block rotatably coupled to the first through hole and having a polygonal hole to which the polygonal rod is slidably coupled, and a first bevel gear formed on an outer circumferential surface of the upper end thereof;

And a drive block rotatably coupled to the second through hole and having a second bevel gear screwed with the first bevel gear at one end thereof and a drive shaft having a rotational driving force at the other end thereof.

When the driving block is rotated so that the lifting bolt is moved up and down,

A spring member for elastically supporting the lower end of the elevating bolt is provided inside the polygonal hole.

In addition, the device of the present invention is further provided with a seating protrusion for mounting each jig leg is supported on the upper surface of the body, characterized in that at least one of the jig leg and the mounting protrusion is formed of an elastic rubber material.

First, it is economical because only the separation block 209 in which the positioning projection 202 is easily contaminated or worn is formed.

Second, since the jig is screwed to the clamping chuck by the rotation of the lifting bolt, the assembly and separation of the jig and the clamping chuck is easy.
In particular, the present invention forms a polygonal rod portion 212 in the elevating bolt 210 and has a spring member 240 for elastically supporting the elevating bolt 210 to enable the elevating bolt 210 to be elevated up and down.
As such, the structure in which the elevating bolt 210 is elevated, when the jig 110 is coupled to the clamping chuck 200, first presses the elevating bolt 210 protruding to the upper portion of the clamping chuck 200. When the lowering and then the groove 114a of the jig 110 is coupled to the positioning protrusion 202 of the clamping chuck 200 to be positioned, the upper end of the elevating bolt 210 is the screw hole 115 of the jig 110. ) Will match.
When the lifting bolt 210 is rotated by connecting an electric motor to the driving shaft 232 in such a state, the lifting operation of the lifting bolt 210 by the spring member 240 and the rotating operation by the motor are simultaneously performed. , The bolt portion 211 of the elevating bolt 210 is to be quickly screwed into the screw hole 115 of the jig 110.
In the clamping device as described above, since the screwing of the lifting bolt 210 is performed while the groove 114a of the jig 110 is coupled to the positioning protrusion 202 of the clamping chuck 200, the positioning protrusion ( It is possible to prevent damage to the 202 or the groove 114a.

Third, since the jig 110 is screwed to the lifting bolt 210 and firmly fixed at the correct position by the plurality of positioning protrusions 202 and the jig leg 113, the jig 110 and The shaking between the clamping chuck 200 is prevented to improve the processing quality than conventional.

Fourth, by employing the spring member 240, even after the jig 110 is separated from the elevating bolt 210, the elevating bolt 210 is protruded to the upper portion of the body 201 by the restoring force of the spring member again jig ( 110 to facilitate the operation of screwing the elevating bolt 210.

Fifth, the jig 110 is elastically biased upward by the elastic restoring force of the jig leg 113 or the seating protrusion 205 of the rubber material to prevent microfluidism due to the thread backlash of the elevating bolt 210. Improve processing quality

1 is a schematic diagram illustrating a general discharge machining,
2 to 4 is a schematic diagram illustrating a clamping device between a conventional jig and a clamping chuck,
5 is a plan view showing a clamping device in which a plurality of clamping elements for clamping a jig are integrated into one body 201;
6 is a side view of FIG. 5;
7 is a cross-sectional view taken along line AA of FIG.
8 is a sectional view taken along line BB of FIG.
9 shows a side view of FIG. 5.
10 and 11 are schematic perspective views illustrating a coupling relationship between a jig and a clamping chuck by separating a part from FIG. 5.
12 is an excerpt perspective view illustrating a driving part of a clamping chuck;
13A and 13B are schematic views illustrating the coupling operation of the jig and the clamping chuck.

General matters about the electric discharge machining technique are described in detail in the above prior art, and thus description thereof will be omitted.

The clamping device of the embodiment of the present invention makes it easy to attach or detach the jig to which the electrode as a work piece is coupled to the clamping chuck to process the electrode for electric discharge machining, and to easily replace only the separation block on which the positioning projection is prone to contamination or wear. Has an improved structure.

FIG. 5 shows a clamping device in which a plurality of clamping elements for clamping a jig are integrated into one body 201, FIG. 6 shows a side view of FIG. 5, and FIG. 7 is a cross-sectional view taken along line AA of FIG. 5. 8 is a sectional view taken along line BB of FIG. 5, and FIG. 9 is a side view of FIG. 5.

10 and 11 are schematic perspective views illustrating a coupling relationship between a jig and a clamping chuck by separating a part from FIG. 5.

Referring to the drawings, the jig 110 has the same structure as described in the prior art.

That is, the upper surface of the jig 110 is formed with a coupling groove 111 to which an electrode (not shown) is coupled, and a screw hole 115 having a female thread is formed at the center of the lower surface thereof, and a plurality of jigs on the lower edge thereof. Leg 113 is coupled.

In addition, a coupling plate 114 having a plurality of grooves 114a is coupled to the bottom surface of the jig 110.

5 and 7, the clamping chuck 200 has a body 201 having a seating groove 207 formed on an upper surface thereof, and a separation block 209 that is coupled to and detachably coupled to the seating groove 207. ).

As shown in FIG. 8, the body 201 and the separation block 209 are assembled and detachable by the fastening bolt 270.

The separation block 209 has a plurality of positioning projections 202 to each of the grooves 114a are coupled to the upper surface, and the third through hole 206 penetrating up and down is formed in the central portion of the upper surface.

The body 201 has a first through hole 203 communicating with the third through hole 206 up and down, and is slidable in the first through hole 203 and the third through hole 206. The screw hole 115 by rotating and elevating the elevating bolt 210 and the elevating bolt 210 is screwed to the screw hole 115 is coupled to the upper portion is released to the outside of the separation block 209. It is provided with a lifting means for screwing or separating.

Referring to Figures 7 and 12, the lifting means has the following configuration.

The elevating bolt 210 is formed with a bolt portion 211 formed with a male screw at the top and a polygonal rod portion 212 having a polygonal surface formed at the bottom thereof.

A first through hole 203 is formed in the center of the body 201 of the clamping chuck and is coupled to the lifting bolt 210 so that the lifting bolt 210 can be retracted, and the first through hole is formed at the side of the body 201. A second through hole 204 communicating with 203 is formed.

The rotation block 220 is rotatably coupled to the lower side of the first through hole 203, and the drive block 230 is coupled to the second through hole 204.

The rotation block 220 has a polygonal hole 222 is formed in the center portion of the polygonal rod portion 212 slidably coupled up and down, and the first bevel gear 221 is formed on the outer peripheral surface.

The driving block 220 has a second bevel gear 231 screwed to the first bevel gear 221 at one end thereof, and a drive shaft 232 provided with a rotation driving force at the other end thereof.

The drive shaft 232 protrudes out of the body 201 and is connected to an electric motor (not shown) to provide rotational power.

The lifting means as described above is the rotation block 220 is rotated by the rotational power of the drive block 230, the lifting bolt 210 is rotated while moving up and down accordingly, the jig 110 is screwed or separated To be possible.

On the other hand, the inside of the polygonal hole 222 is a spring member 240 for elastically supporting the lower end of the elevating bolt 210 is coupled. In this case, after the lifting bolt 210 is rotated downward and separated from the jig 110, the lifting bolt 210 is protruded upward by the restoring force of the spring member 240. Accordingly, it is convenient to screw the jig 110 to the lifting bolt 210 again.

For example, if the spring member 240 is not used in FIG. 7, after the jig 110 and the lifting bolt 210 are separated, the lifting bolt 210 falls into the first through hole 203 by its own weight. Since the assembly of the bolt hole 211 of the elevating bolt 210 to the screw hole 115 of the jig 110 at a later time of assembly is cumbersome.

Reference numeral 250 is an assembly plate to prevent the departure of the drive block 230, 260 is a closing plate 260 to prevent the separation of the spring member 240 and the rotation block 220, 205 is the jig leg ( 113) is a seating protrusion to be seated.

In the above, at least one of the jig leg 113 and the seating protrusion 205 is formed of an elastic rubber material.

After the jig 110 is completely screwed to the lifting bolt 210, the positioning protrusion 202 is coupled to the groove 114a and the jig leg 113 is seated on the seating protrusion 205. The jig 110 is elastically biased upward by the elastic restoring force of the jig leg 113 or the mounting protrusion 205 to prevent microfluidic flow caused by the backlash of the thread of the elevating bolt 210 to improve processing quality. Let's do it.

The clamping device of the configuration as described above is made as follows.

First, the electrode (not shown), which is a workpiece, is coupled to the coupling groove 111 of the jig 110, and the wrench bolt 112 is tightened and fixed.

Subsequently, the jig 110 is mounted on the separation block 209, and the positioning protrusion 202 and the groove 114a are matched, and the screw hole 115 and the lifting bolt 210 are matched.
That is, when the lifting bolt 210 protruding upward by the elasticity of the spring member 240 is pressed by the jig 110, the lifting bolt 210 is lowered while compressing the spring member 240 as shown in FIG. 13A. As the groove 114a of the jig 110 is initially coupled to the positioning protrusion 202, the upper end of the bolt portion 211 of the lifting bolt 210 comes into contact with the inlet of the screw hole 115 of the jig 110.

At this time, the elevating bolt 210 is protruded upward by the restoring force of the spring member 240 to facilitate the initial coupling of the screw hole 115 and the elevating bolt 210.

Then, when the drive block 230 is rotated by connecting the motor to the drive shaft 232, the rotation block 220 is interlocked to rotate in place, as shown in Figure 13b as the lifting bolt 210 is rotated and raised screw holes ( It is screwed to the 115 and is fixed to the jig 110 in close contact with the clamping chuck (200).

At this time, since each groove 114a on the jig 110 side is fitted to the four positioning protrusions 202, it is firmly fixed to the correct position even by the coupling by one lifting bolt 210.

Therefore, since the jig 110 is screwed to the lifting bolt 210 and firmly fixed to the correct position by the plurality of positioning protrusions 202 and the jig leg 113, the jig 110 is clamped despite the external vibration. Shaking between the chucks 200 is prevented to improve the machining quality than before.
In particular, the clamping device as described above is a lifting bolt 210 as shown in Figure 13b in a state in which the groove 114a of the jig 110 is coupled to the positioning projection 202 of the clamping chuck 200 as shown in Figure 13a. Since screwing is performed, damage to the positioning protrusion 202 or the groove 114a can be prevented.
That is, when the bolt portion 211 and the screw hole 115 is first screwed to a high speed rotation by the electric motor, the body 201 of the jig 110 and the clamping chuck 200 are brought closer by the bolt fastening force. Later, the positioning protrusions 202 and the grooves 114a are coupled to each other, and the positioning protrusions 202 and the grooves 114a are damaged when the positioning protrusions 202 and the grooves 114a are not exactly aligned. The problem arises.

In addition, as shown in Figs. 5 and 6, a plurality of clamping elements are coupled to one body 201 to enable CNC machining of a plurality of workpieces.

On the other hand, the positioning projection 202 is coupled with the groove 114a of the jig 110, and wear occurs. In this case, the gap between the groove 114a causes the gap of the jig 110 by external vibration. Since vibration is generated, the processing quality is reduced during processing.

In addition, the upper surface portion of the clamping chuck exposed to the outside during processing, that is, the separation block 209 is easy to be contaminated, so frequent exchange is required.

Therefore, the clamping device of the embodiment of the present invention detachably couples the body 201 and the separation block 209 of the clamping chuck 200, and forms a positioning protrusion 202 in which wear occurs in the separation block 209. By removing the fastening bolt 270, only the separation block 209 can be replaced.

110 .... Jig 111 ... Joining groove
113 Zig leg 115 Screwdriver
200 ... clamp chuck 210 ... lift bolt
220.Rotating Block 230 ... Drive Block
240 ... spring member 209 ... separation block

Claims (4)

In the clamping device of the workpiece coupling jig for detachably coupling the jig to which the workpiece is coupled to the clamping chuck,
The jig 110 is formed on the upper surface and the coupling groove 111 to which the workpiece is coupled, the screw hole 115 formed in the center of the lower surface and the female thread formed, and the plurality of jig legs 113 coupled to the edge of the lower surface And a coupling plate 114 coupled to the lower surface and having a plurality of grooves 114a formed therein;
The clamping chuck 200 includes a body 201 having a seating groove 207 formed on an upper surface thereof, and a separation block 209 coupled to and detachably coupled to the seating groove 207;
The separation block 209 has a plurality of positioning projections 202 to each of the grooves (114a) is formed on the upper surface, and the third through hole (206) penetrated up and down in the central portion of the upper surface;
The body 201 of the clamping chuck 200 is formed with a first through hole 203 communicating with the third through hole 206, and the first through hole 203 and the third through hole 206. The lifting bolt 210 and the lifting bolt 210 is screwed to the screw hole 115 and the upper portion is slidably coupled to the separation block 209 and the lifting bolt 210 by rotating and lifting the na It is provided with lifting means for screwing or detaching to the threaded hole 115,
The lifting means is; The elevating bolt 210 is formed with a bolt portion 211 formed with a male screw on the upper portion and a polygonal rod portion 212 having a polygonal surface formed on the lower portion thereof, and the first through hole 203 and a side portion of the body 201. A second through hole 204 is formed in communication,
A rotating block is rotatably coupled to the first through hole 203 and a polygonal hole 222 to which the polygonal rod part 212 is slidably coupled is formed, and a first bevel gear 221 is formed on an outer circumferential surface of the upper end thereof. 220,
A drive shaft 232 rotatably coupled to the second through hole 204 and having a second bevel gear 231 screwed with the first bevel gear 221 at one end thereof and provided with a rotation driving force at the other end thereof. ) Is provided with a driving block 230,
When the driving block 230 is rotated so that the lifting bolt 210 is moved up and down,
Clamping device of the workpiece coupling jig for partially replaceable, characterized in that the spring member 240 for elastically supporting the lower end of the elevating bolt 210 is provided inside the polygonal hole (222). delete delete The method of claim 1, wherein the mounting protrusions 205 on which each jig leg 113 is seated and supported are further provided on an upper surface of the body 201, and at least one of the jig legs and the mounting protrusions is made of an elastic rubber material. Clamping device of the jig for combining the workpiece, characterized in that formed.

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