KR101520542B1 - Anti-vibration Structure of cutting tool - Google Patents

Abstract

The present invention relates to an anti-vibration structure of a cutting tool.
A dustproof structure of a cutting tool according to the present invention relates to a dustproof structure of a cutting tool which is provided with an attenuator inside a tool body to reduce vibration and machining noise and improve machining stability when cutting is performed.
In addition, the dustproof structure of the cutting tool according to the present invention is characterized in that a cutting insert is disposed on the outer peripheral surface of the tool body, oil is inflowed, and oil is injected into the cutting insert to cool the cutting insert. .

Description

[0001] The present invention relates to an anti-vibration structure of a cutting tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dust-proof structure of a cutting tool, and more particularly, to a vibration-damping structure for a cutting tool, To a dustproof structure of a tool.

In general, a machine tool uses a cutting tool to cut a steel workpiece. Since the cutting tool receives a large cutting force during the cutting process, the material of the cutting tool is made of an alloy steel having excellent rigidity.

Alloy steel is known to be widely used as a cutting tool material because it has excellent rigidity and durability and is economical.

However, since the alloy steel has a very high natural frequency, trembling is easily caused by the cutting force, and thus noise is generated.

Further, there is a problem that the life of the insert, which is the cutting edge, is abnormally shortened when the workpiece is directly cut. Even when cutting is impossible due to vibration (tremor), it frequently occurs.

2. Description of the Related Art [0002] Patent Literatures 1 and 2, which will be described later, are known as a technique that has been conventionally configured for vibration damping on a cutting tool.

Patent Document 1 discloses a structure in which a cylinder-shaped pocket is formed in a tool holder, an attenuation means is disposed inside the cylinder, and a cap is screwed into an end portion of the cylinder. An O-ring is disposed on the outer circumferential surface of the attenuation means so that the outer circumferential surface of the attenuation means and the inner circumferential surface of the cylindrical shape are spaced apart from each other. In terms of operation, a tool is provided on the plug side to perform a substantial cutting operation, and the vibration (or shock) is transmitted from the tool side and canceled by the attenuation means.

However, in the dustproof structure disclosed in Patent Document 1, the distance between the tool holder and the stopper is required to be a screw thread length for fastening, and the distance from the vibration source to the attenuation means is distanced by the distance, .

In Patent Document 2, a cylindrical damper is disposed on the outer circumferential surface of the circular tube, and a rubber ring is disposed between the tube and the damper, so that vibration (or shock) transmitted to the tube is attenuated by the damper.

However, the anti-vibration structure disclosed in Patent Document 2 is a structure type supported by a circular tube, which has a problem of relatively low rigidity.

On the other hand, Patent Documents 1 and 2 are designed to counteract impacts or vibrations acting in the radial direction with respect to the center line of rotation with reference to the center of rotation of the cutting tool, but in the axial direction (direction parallel to the rotational center line) There is a problem that there is almost no vibration reduction effect on the impact or vibration to be applied.

Therefore, an anti-vibration structure that can suppress the vibration (vibration) of the cutting tool is required.

Particularly, as the shape of the cutting process is diversified, a direction in which impact or vibration is applied to the cutting tool is complex and can be combined in a lateral direction and an axial direction, for example.

Korean Patent Publication No. 10-2009-0107974 (Oct. 14, 2009) International Patent Publication No. WO92 / 14947 (Sep. 3, 1992)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vibration damping structure for a cutting tool, which is capable of vibration damping more effectively and reducing noise by arranging the damping body as close as possible to the cause of vibration, There is a purpose.

It is another object of the present invention to provide a vibration damping structure of a cutting tool that can more rapidly attenuate vibrations by allowing vibration energy transmitted from the outside to be transmitted to a damping body more quickly.

It is still another object of the present invention to provide a vibration damping structure of a cutting tool capable of coping with such vibration even if the direction in which the vibration is applied is a combination of the lateral direction and the axial direction.

It is another object of the present invention to provide a dustproof structure of a cutting tool in which a damping body is disposed in a cutting tool but the rigidity of the cutting tool is not lowered even if the size of the damping body is designed to be relatively large have.

The present invention has been made in view of the above problems, and it is an object of the present invention to at least partially solve the problems in the conventional arts. There will be.

According to an aspect of the present invention, there is provided a dustproof structure for a cutting tool, comprising: a cylinder pocket having an inner circumferential surface formed with an inner circumferential surface and a first fastening portion extending from an inner end of the cylinder pocket toward a tool shank; 124) are formed; A first cylinder body 212 is formed in the first plug 210 and a second coupling part 214 is formed in the first plug 210 so as to be coupled to the first coupling part 124, An inner holder (200) having a first inner cylinder (220) formed in a first cylinder body (212); First and second pocket grooves 310 and 320 are formed at both ends of the cylinder pocket 120 and first and second pocket grooves 310 and 320 are formed on the inner and outer sides of the first and second pocket grooves 310 and 320, A second inner insert 314 and 324 and first and second outer inserts 312 and 322 are formed and the first cylinder body 212 is received in the first pocket groove 310, An inner insert (314) housed in the first inner cylinder (220); A second cylinder body 412 is formed in the second plug 410 and a second inner cylinder 420 is formed in the second cylinder body 412. The second plug 410 is inserted into the cylinder pocket 120 and the second cylinder body 412 is received in the second pocket groove 320 and the second inner insert 324 is received in the second inner cylinder 420 An outer holder 400; A first ring unit (510) disposed between the first cylinder body (212) and the first pocket groove (310) and restored and shrunk; And a second ring unit (520) disposed between the second cylinder body (412) and the second pocket groove (320) and restored by shrinkage.

The dustproof structure of the cutting tool according to the present invention is characterized in that a plug pocket 122 is formed in an inner end surface of the cylinder pocket 120 and the first plug 210 is received in the plug pocket 122 .

In the dustproof structure of the cutting tool according to the present invention, the open pocket 130 is formed at the outer end of the cylinder pocket 120, the outer holder 400 is disposed at the open pocket 130, And the outer holder 400 may be welded and fixed in the open pocket 130.

The dustproof structure of the cutting tool according to the present invention is characterized in that the jaw 132 is formed on the open pocket 130 and the second plug 410 of the outer holder 400 is disposed on the jaw 132 So that the outer holder 400 is aligned.

In the dustproof structure of the cutting tool according to the present invention, a cutting insert pocket 140 is formed on the outer circumferential surface of the tool body 100, and the cutting insert 140 is inserted into the cylinder pocket 120 from the tool shank 110, A second flow path 162 is formed through the inner holder 200 so as to communicate with the first flow path 161 and the cylinder pockets 120 are formed in the tool body 100, A first oil hole 142 is formed in the cutting insert pocket 140 toward the cutting insert pocket 140 and a second oil hole 250 is formed through the first cylinder body 212, May be injected into the cutting insert 20 through the oil passages 161 and 162 and the first and second oil holes 142 and 250 and installed in the cutting insert pocket 140.

The vibration preventing structure of the cutting tool according to the present invention is characterized in that a third flow path 163 is formed through the damping body 300 and a third oil hole 450 is formed through the second cylinder body 412, And the oil passes through the first, second and third oil passages 161, 162 and 163 and the first, second and third oil holes 142, 250 and 450, (20) mounted on the cutting insert (140).

The ratio of the outer circumferential surface radius R1 of the tool body 100 to the inner circumferential surface radius R2 of the cylinder pocket 120 is 1: 0.7.

The details of other embodiments are included in the detailed description and drawings.

According to the dust-proof structure of the cutting tool according to the present invention as described above, since the damping body is provided inside the tool body, the damping body can be disposed as close as possible to the cause of vibration, It is possible to more effectively prevent vibration (tremor), and also to reduce noise.

Further, the vibration-proof structure of the cutting tool according to the present invention allows the vibration energy transmitted from the outside to be transmitted more quickly from the tool body toward the damping body, by allowing a part of the tool body to be engaged at a position near the center of the damping body, It is possible to more quickly prevent vibration.

According to the dust-proof structure of the cutting tool according to the present invention, since the damping body is arranged so as to be able to flow in the lateral direction and the axial direction with respect to the rotational center axis with reference to the rotational direction of the cutting tool, The vibration can be counteracted by such vibration.

Further, the dust-proof structure of the cutting tool according to the present invention can provide the cylinder pocket as large as possible without reducing the rigidity of the tool body, and by arranging the damping body in the cylinder pocket, The rigidity of the tool is maintained by the tool holder, so that the rigidity of the cutting tool is not lowered.

In addition, the vibration-proof structure of the cutting tool according to the present invention can minimize the natural vibration of the cutting tool by quickly vibration-damping the vibration, and can improve the productivity by cutting.

Further, the dust-proof structure of the cutting tool according to the present invention can prevent surface roughness of the surface of the cutting work by preventing vibration, and can prevent the life of the cutting tool and the spindle life from being shortened abnormally.

Further, the dust-proof structure of the cutting tool according to the present invention can achieve economical and high-efficiency cutting by improving the machining stability by rapidly vibration-proofing the vibration.

1 is a view for explaining a cutting tool according to a comparative example.
2 is a view for explaining vibration of a cutting tool according to a comparative example.
3 to 6 are views for explaining a dust-proof structure of a cutting tool according to an embodiment of the present invention, Fig. 3 is a front view showing an external shape, Fig. 4 is a longitudinal sectional view for explaining the configuration of an assembled state, 5 is an enlarged view of the lower portion, and Fig. 6 is an exploded view for explaining the overall configuration.
7 is a view for explaining a dust-proof structure of a cutting tool according to another embodiment of the present invention.
8 is a graph showing the results of the static vibration test according to the comparative example.
9 is a graph showing the results of a static vibration test according to an embodiment of the present invention.
10 is a graph showing the results of the natural frequency test according to the comparative example.
11 is a graph showing a result of a natural frequency test according to an embodiment of the present invention.
12 is a graph showing a comparison between the results of the dynamic vibration test according to the comparative example and the embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the embodiments described below are provided for illustrative purposes only, and that the present invention may be embodied with various modifications and alterations. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention. The accompanying drawings are not necessarily drawn to scale to facilitate understanding of the invention, but may be exaggerated in size.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

First, the correlation between the vibration and the cutting tool will be described.

Every object has a natural frequency. The natural frequency gives an external force to the object. When the external force is removed, the object continues to vibrate. The speed at which the object vibrates is called the "natural frequency".

Since the material of the cutting tool is made of alloy steel which is very strong in rigidity, the natural frequency is very high (large) and it has a condition to easily vibrate (vibration) against external force (cutting force).

The dustproof structure of the cutting tool according to an embodiment of the present invention includes a cutting tool with an attenuating means to reduce the natural frequency of the cutting tool so that the vibration can be suppressed under the condition that the vibration easily occurs.

Like reference numerals refer to like elements throughout the specification.

First, a cutting tool according to a comparative example will be described with reference to FIGS. 1 and 2. FIG.

1 is a view for explaining a cutting tool according to a comparative example. 2 is a view for explaining vibration of a cutting tool according to a comparative example.

The cutting tool 10 according to the comparative example has a tool shank 11 formed on one side of the tool body 12 and a cutting insert 20 provided on the outer circumferential surface of the tool body 12. [ The cutting inserts 20 may be arranged in a plurality and arranged spirally, as shown in Fig. In addition, the cutting insert 20 may be arranged in a plurality of helical shapes.

In one spiral array, a plurality of cutting inserts 20 may be arranged as described above. For example, five of the first to fifth cutting inserts 21 to 25 may be arranged in succession.

Thus, when a plurality of cutting inserts 20 are arranged, vibration is generated in each cutting insert 20, and vibration applied to the cutting tool 10 when the cutting is performed is doubled. This will be described with reference to FIG.

In Figure 2, the first row of vibrations is a graphical representation of the vibration energy produced by the first cutting insert 21. Likewise, the second to fifth row vibrations are graphs of the vibration energy generated by the second to fifth cutting inserts 22 to 25, respectively.

As shown in FIG. 2, it can be seen that as the number of cutting inserts is increased, the vibration is further increased. This increased vibration is a problem of lowering the cutting quality.

Further, when cutting is performed by the cutting insert, a high temperature is generated. Such a high heat causes the cutting chips to be entangled in the cutting insert, which shortens the service life of the cutting insert. On the other hand, in the cutting tool according to the comparative example, a large number of cutting inserts are arranged by arranging the cutting inserts in a spiral shape and arranging a plurality of the spirals. Therefore, an alternative is needed to perform cooling for each cutting insert.

Hereinafter, a dust-proof structure of a cutting tool according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 3 is a front view showing an external shape, and FIG. 4 is a longitudinal sectional view for explaining a configuration of an assembled state. FIG. 3 is a perspective view of a cutting tool according to an embodiment of the present invention. Fig. 5 is an enlarged view of the lower part, and Fig. 6 is an exploded view for explaining the overall structure.

The vibration damping structure of the cutting tool according to the embodiment of the present invention is characterized in that the cutting insert 20 is installed on the outer periphery of the tool body 10 and the damping body 300 is disposed inside the tool body 100 so as to freely swing And the damping body 300 is arranged so as to be very close to the cutting insert 20, thereby maximizing the effect of vibration reduction.

The tool body 100 has a cylindrical pocket 120 formed on an inner circumferential surface thereof and a first fastening portion 124 is formed at an inner end of the cylinder pocket 120 toward the tool shank 110.

The ratio (R1: R2) of the outer circumferential surface radius R1 of the tool body 100 to the inner circumferential surface radius R2 of the cylinder pocket 120 may be 1: 0.3 to 0.7. That is, the smaller the thickness of the tool body 100 at the position of the cylinder pocket 120, the larger the size of the damping body 300 can be provided, but the rigidity of the tool body 100 may be reduced. On the other hand, the greater the thickness of the tool body 100 at the position of the cylinder pocket 120, the greater the rigidity of the tool body 100, but the size of the damping body 300 may be limited. The thickness of the tool body 100 at the position of the cylinder pocket 120 is equal to the ratio R1: R2 of the outer circumferential surface radius R1 of the tool body 100 to the inner circumferential surface radius R2 of the cylinder pocket 120 1: 0.3 to 0.7.

The vibration damper structure of the cutting tool according to the embodiment of the present invention has a structure in which the ratio of the length L1 of the tool body 100 excluding the tool shank 110 to the length L2 of the damping body 300 1: 0.5 to 0.8. As the length L2 of the damping body 300 is increased, the damping performance is improved, but the size of the cylinder pocket 120 accommodating the damping body 300 can not be made large indefinitely. Particularly, when the size of the cylinder pocket 120 is designed too large, the size of the cylinder pocket 120 should be limited because the fastening portions of the first and second fastening portions 124 and 214 can be shortened. The length L1 of the tool body 100 excluding the tool shank 110 is preferably set appropriately so that the length (size) of the cylinder pocket 120 is appropriately set in order to maintain the fastening force of the inner holder 200. [ And the length L2 of the attenuator 300 is 1: 0.5 to 0.8.

In addition, the tool body 100 has a cutting insert pocket 140 formed on the outer circumference thereof, and a cutting insert 20 is installed on the cutting insert pocket 140. The cutting insert pockets 140 may be formed in a continuous spiral shape and a plurality of spiral cutting insert pocket rows 140 may be disposed.

A plug pocket 122 may be formed on an inner end surface of the cylinder pocket 120. The plug pocket 122 receives the first plug 210 of the inner holder 200. [ Since the first plug 210 is received in the plug pocket 122, the tool body 100 and the inner holder 200 are integrally assembled to transmit vibration energy externally applied to the damping body 300 more quickly .

On the other hand, an open pocket 130 may be formed at the outer end of the cylinder pocket 120, and an outer holder 400 may be disposed at the open pocket 130. As shown in FIG. 4, the outer holder 400 may be welded and fixed in the open pocket 130. The welded portion is described as the welded portion 600. This makes it possible to physically hold the damping body 300 in the cylinder pocket 120 and to prevent the damping body 300 from being detached during the cutting operation.

On the other hand, the jaw 132 may be formed in the open pocket 130. A second plug 410 of the outer holder 400 is disposed on the jaw 132. Whereby the outer holder 400 is aligned. Further, since the position of the outer holder 400 is aligned in the cylinder pocket 120, it is possible to secure a clearance space in which the damping body 300 can be moved in the axial direction of the tool body 100.

The inner holder 200 is formed with the first cylinder body 212 in the first plug 210 and the second coupling part 214 is formed in the first plug 210 so as to be coupled to the first coupling part 124 do. In addition, the first inner cylinder 220 is formed in the first cylinder body 212. By providing the inner holder 200 in the cylinder pocket 120 in a separate structure, the machining cost for installing the damping body 300 can be reduced. In other words, the cylinder pocket 120 is machined into a long, cylindrical space, and therefore, there is a disadvantage in that the workability is not easy. Particularly, since the outer holder 200 has a first groove 240 formed in the outer shape of the first cylinder body 212 and a second oil hole 250 formed in the outer shape of the inner cylinder 200, It may be difficult to process the second oil hole 250 when the holder 200 is integrally provided. Therefore, it is advantageous in terms of cost reduction to process a simple shape in the inside of the cylinder pocket 120 and to process and assemble the inner holder 200 as a separate accessory.

The attenuator (300) is a component disposed in the cylinder pocket (120). The attenuator 300 may be a high-density steel having a density higher than that of the tool body 100. For example, the attenuator 300 may use a high-density material having a specific gravity of 16 or higher. First and second pocket grooves 310 and 320 are formed at both ends of the damping body 300 and first and second inner grooves 310 and 320 are formed on the inner and outer sides of the first and second pocket grooves 310 and 320, 314, and 324 and the first and second outer inserts 312 and 322 are formed. The first cylinder body 212 is received in the first pocket groove 310 and the first inner insert 314 is received in the first inner cylinder 220. That is, as shown in FIG. 4, the inner holder 200 and the damping body 300 are in a zigzag form in a cross-sectional view of the coupled state.

The outer holder 400 is a component in which the second plug 410 is installed at the outer end of the cylinder pocket 120. The outer holder 400 is formed with the second cylinder body 412 in the second plug 410 and the second inner cylinder 420 is formed in the second cylinder body 412. The second cylinder body 412 is received in the second pocket groove 320 and the second inner insert 324 is received in the second inner cylinder 420. That is, as shown in FIG. 4, the outer holder 400 and the damping body 300 are in a zigzag form in a sectional view of the coupled state. On the other hand, a second ring groove 440 is formed on the outer circumferential surface of the second cylinder body 412.

A first ring unit 510 is disposed between the first cylinder body 212 and the first pocket groove 310. Similarly, a second ring unit 520 is disposed between the second cylinder body 412 and the second pocket groove 320. More specifically, the first and second ring units 510 and 520 may be disposed in the first and second ring grooves 240 and 440, respectively. As a result, the first and second ring units 510 and 520 can be maintained in an aligned state without any disengagement.

The first and second ring units 510 and 520 may be materials of elastic deformation that perform a function of restoring shrinkage and restoring elasticity to be restored after an external force acts upon it. For example, the material of the first and second ring units 510 and 520 may be a rubber material or a synthetic resin having stretchability. The first and second ring units 510 and 520 are compressed and the opposite side of the compression ring is relaxed, and when the compression and compression are performed, The damping body 300 is shaken while the one side is restored, thereby reducing the vibration externally applied.

On the other hand, a first flow path 161 is formed to penetrate from the tool shank 110 to the cylinder pocket 120. Further, the second flow path 162 is formed through the inner holder 200 so as to communicate with the first flow path 161. A first oil hole 142 is formed in the tool body 100 from the cylinder pocket 120 toward the cutting insert pocket 140. A second oil hole 250 is formed through the first cylinder body 212. The oil passes through the first and second oil passages 161 and 162 and the first and second oil holes 142 and 250 and is injected into the cutting insert 20 installed in the cutting insert pocket 140. Since the cutting insert 20 is cooled by the oil, the life of the cutting insert 20 can be prevented from being abnormally shortened.

On the other hand, the third flow path 163 may be formed through the damping body 300, and the third oil hole 450 may be formed through the second cylinder body 412. This allows the oil to pass through the first, second and third oil passages 161, 162 and 163 and the first, second and third oil holes 142, 250 and 450 and be installed in the cutting insert pocket 140 Can be injected into the cutting insert (20).

Particularly, when the oil passes through the third oil hole 163 and the third oil hole 450, the oil can prevent the pressure loss of the oil to the maximum when the oil passes through the first oil hole 142, . Further, since a large amount of oil can be supplied to the cutting insert 20, it is possible to expect an increase in the cooling effect by the oil and an increase in the chip chip discharge effect.

Referring to FIG. 7, a dustproof structure of a cutting tool according to another embodiment of the present invention will be described. 7 is a view for explaining a dust-proof structure of a cutting tool according to another embodiment of the present invention.

As shown in FIG. 7, the cylinder pocket 120 formed in the tool body 100 may have a low depth. In this case, the first cylinder body 212 can be formed directly on the tool bar 100 by eliminating the inner holder 200. That is, the cylinder pocket 120 is formed in the tool body 100 and the damping body 300 can be shaken on the cylinder pocket 120. The outer holder 400 can be separated from the damping body 300 Can be prevented. The configuration in which the damping body 300 can be shaken is realized by the first and second ring units 510 and 520, which is a configuration and operation described in the dustproof structure of the cutting tool according to the embodiment of the present invention The same description will be omitted.

Hereinafter, the operation and effect of the dustproof structure of the cutting tool according to the embodiment of the present invention will be described with reference to FIGS. 8 to 12. FIG.

8 is a graph showing the results of the static vibration test according to the comparative example. 9 is a graph showing the results of a static vibration test according to an embodiment of the present invention.

FIG. 8 is a graph showing a static vibration test of a general cutting tool not provided with a dustproof structure.

FIG. 9 is a graph illustrating a static vibration test of a cutting tool having a dustproof structure according to an embodiment of the present invention.

As can be seen from Figs. 8 and 9, there is a significant difference in the time taken for the vibration to disappear when the vibration is generated. In particular, as shown in FIG. 9, it can be seen that the vibration is rapidly attenuated in the cutting tool to which the dustproof structure according to the embodiment of the present invention is applied.

10 is a graph showing the results of the natural frequency test according to the comparative example. 11 is a graph showing a result of a natural frequency test according to an embodiment of the present invention.

FIG. 10 is a graph showing a natural frequency test of a general cutting tool not provided with a dustproof structure.

11 is a graph illustrating a natural frequency test of a cutting tool equipped with a dustproof structure according to an embodiment of the present invention.

As can be seen from FIGS. 10 and 11, when the vibration is generated, the comparative example has a peak shape with a very high natural frequency, which is vulnerable to vibration. On the other hand, the embodiment according to the present invention shows a very small change such that there is almost no change in the natural frequency even if external vibration is applied. That is, in the cutting tool to which the dustproof structure according to the embodiment of the present invention is applied, the natural frequency with respect to the external vibration is very small, so that the cutting operation can be carried out very stably and the machining quality can be improved.

12 is a graph comparing the results of the dynamic vibration test according to the comparative example and the embodiment of the present invention.

12 is a graph showing the results of the dynamic test, that is, measuring the vibration energy generated while moving relative to the workpiece when performing cutting. The cutting conditions of the dynamic vibration test were set to a feed speed of 197 m / min and an infeed depth of 0.23 mm / t, and the cutter outer diameter of the tool was 128 mm.

As shown in Fig. 12, the comparative example shows that the natural frequency is high and appears very irregularly while the cutting is being performed. On the other hand, when the cutting process is performed according to the embodiment of the present invention, it can be seen that the natural frequency is kept constant while the cutting process is performed. That is, according to the embodiment of the present invention, the cutting process is carried out very stably.

As described above, the dust-proof structure of the cutting tool according to the embodiment of the present invention includes the damping body 300 inside the tool body 100 so that the damping body 300 is disposed as close as possible to the cause of vibration So that vibration (vibration) can be more effectively damped even when the vibration energy applied to the cutting tool is large, and the noise can be further reduced.

In the vibration damping structure of the cutting tool according to the embodiment of the present invention, a portion of the tool body 100 is bound at a position near the center of the damping body 300, To the attenuator (300) more quickly, thereby making it possible to more quickly prevent vibration.

In addition, the dustproof structure of the cutting tool according to the present invention is characterized in that the direction in which the vibration is applied by arranging the damping body 300 so as to be movable in the lateral direction and the axial direction with respect to the rotational center axis with respect to the rotational direction of the cutting tool Even if they act in combination in the lateral direction and the axial direction, it is possible to deal with such vibration in a dustproof manner.

In addition, the dustproof structure of the cutting tool according to the present invention can provide the cylinder pocket 120 as large as possible without reducing the rigidity of the tool body. By arranging the damping body 300 in the cylinder pocket 120, The rigidity of the cutting tool 300 is not lowered because the rigidity is maintained by the tool holder even if the size of the body 300 is designed to be relatively large as compared with the conventional dustproofing technique.

In addition, the vibration-proof structure of the cutting tool according to the present invention can minimize the natural vibration of the cutting tool by quickly vibration-damping the vibration, and can improve the productivity by cutting.

Further, the dust-proof structure of the cutting tool according to the present invention can prevent surface roughness of the surface of the cutting work by preventing vibration, and can prevent the life of the cutting tool and the spindle life from being shortened abnormally.

Further, the dust-proof structure of the cutting tool according to the present invention can achieve economical and high-efficiency cutting by improving the machining stability by rapidly vibration-proofing the vibration.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the appended claims. The scope of the claims and their equivalents It is to be understood that all changes or modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

The dust-proof structure of the cutting tool according to the present invention can be used to prevent vibration due to the cutting force when performing cutting processing.

20: Cutting insert
100: Tool body 110: Tool shank
120: cylinder pocket 122: plug pocket
124: first fastening part 130: open pocket
132: chin 134: tool section
140: cutting insert pocket 142: first oil hole
161, 162, 163: first, second, and third flow paths
200: Inner holder 210: First plug
212: first cylinder body 214: second fastening portion
220: first inner cylinder 230: first hole
240: first ring groove 250: second oil hole
300: attenuator 310, 320: first and second pocket grooves
312, 322: first and second outer inserts 314, 324: first and second inner inserts
400: Outer holder 410: Second plug
412: second cylinder body
420: second inner cylinder 440: second ring groove
450: third oil hole
510, 520: first and second ring units 600: welding portion

Claims (7)

A tool body (100) having a cylinder pocket (120) formed on an inner circumferential surface thereof and having a first coupling part (124) formed at an inner end of the cylinder pocket (120) toward a tool shank (110);
A first cylinder body 212 is formed in the first plug 210 and a second coupling part 214 is formed in the first plug 210 so as to be coupled to the first coupling part 124, An inner holder (200) having a first inner cylinder (220) formed in a first cylinder body (212);
First and second pocket grooves 310 and 320 are formed at both ends of the cylinder pocket 120 and first and second pocket grooves 310 and 320 are formed on the inner and outer sides of the first and second pocket grooves 310 and 320, A second inner insert 314 and 324 and first and second outer inserts 312 and 322 are formed and the first cylinder body 212 is received in the first pocket groove 310, An inner insert (314) housed in the first inner cylinder (220);
A second cylinder body 412 is formed in the second plug 410 and a second inner cylinder 420 is formed in the second cylinder body 412. The second plug 410 is inserted into the cylinder pocket 120 and the second cylinder body 412 is received in the second pocket groove 320 and the second inner insert 324 is received in the second inner cylinder 420 An outer holder 400;
A first ring unit (510) disposed between the first cylinder body (212) and the first pocket groove (310) and restored and shrunk; And
A second ring unit (520) disposed between the second cylinder body (412) and the second pocket groove (320) and restored by shrinkage;
Wherein the cutting tool has an anti-vibration structure.
The method according to claim 1,
Wherein a plug pocket (122) is formed in an inner end surface of the cylinder pocket (120), and the first plug (210) is received in the plug pocket (122).
The method according to claim 1,
An open pocket 130 is formed at an outer end of the cylinder pocket 120 and the outer holder 400 is disposed at the open pocket 130. The outer holder 130 is provided at the open pocket 130, And is welded and fixed.
The method of claim 3,
A jaw 132 is formed on the open pocket 130 and the second plug 410 of the outer holder 400 is disposed on the jaw 132 so that the outer holder 400 is aligned. Of a cutting tool.
The method according to claim 1,
A cutting insert pocket 140 is formed on the outer peripheral surface of the tool body 100,
A first flow path 161 is formed to penetrate from the tool shank 110 to the cylinder pocket 120,
A second flow path 162 is formed through the inner holder 200 so as to communicate with the first flow path 161,
A first oil hole 142 is formed in the tool body 100 from the cylinder pocket 120 toward the cutting insert pocket 140,
A second oil hole (250) is formed through the first cylinder body (212)
The oil passes through the first and second flow paths 161 and 162 and the first and second oil holes 142 and 250 and is injected into the cutting insert 20 installed in the cutting insert pocket 140 Features of the dustproof structure of the cutting tool.
6. The method of claim 5,
A third flow path 163 is formed through the damping body 300,
A third oil hole 450 is formed through the second cylinder body 412,
The oil passes through the first, second and third oil passages 161, 162 and 163 and the first, second and third oil holes 142, 250 and 450 and flows into the cutting insert pocket 140 Is injected into the cutting insert (20) to be installed.
The method according to claim 1,
Wherein a ratio R1: R2 of an outer circumferential surface radius R1 of the tool body 100 to an inner circumferential surface radius R2 of the cylinder pocket 120 is 1: 0.3-0.7.

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