KR101332467B1 - Anti-vibration structure of cutting tool - Google Patents

Abstract

The present invention relates to an anti-vibration structure of a cutting tool. The anti-vibration structure of the cutting tool according to the present invention comprises: a first tool holder (100) in which a first cylinder pocket (110) is formed on the inner side of a first cylinder body (102) and a first inner cylinder (120) is protruding from the inner end of the first cylinder pocket (110); a second tool holder (200) in which a second cylinder pocket (210) is formed on the inner side of a second cylinder body (202) and a second inner cylinder (220) is protruding from the inner end of the second cylinder pocket (210); a vibration reducing body (300) in which first and second pocket grooves (310, 320) are formed on both ends and first and second outer inserts (312, 322) having first and second inner inserts (314, 324) are formed on the outer sides of the first and second pocket grooves (310, 320) on both ends thereof; a first ring (410) which is arranged between the outer surface of the first inner cylinder (120) and the inner surface of the first pocket groove (310) and is contracted and restored; and a second ring (420) which is arranged between the outer surface of the second inner cylinder (220) and the inner surface of the second pocket groove (320) and is contracted and restored. The second tool holder is formed by welding the first end (140) of the first cylinder body (102) and the second end (240) of the second cylinder body (202) to each other in a body. The vibration reducing body reduces vibration by inserting the first inner cylinder (120) into the first pocket groove (310) and inserting the second inner cylinder (220) into the second pocket groove (320).

Description

Anti-vibration Structure of cutting tool

The present invention relates to a dustproof structure of a cutting tool, and more particularly, cutting to reduce vibration and processing noise and improve processing stability when performing cutting operations such as milling, boring, drilling, and turning. It relates to a dustproof structure of a tool.

In general, machine tools use a cutting tool to cut steel-based workpieces. Since the cutting tool receives a large cutting force during the cutting process as described above, the material of the cutting tool is made of alloy steel having excellent rigidity.

Alloy steel is known to be widely used as a cutting tool material because of its excellent rigidity and excellent durability.

However, since alloy steel has a very high natural frequency, in the case of a cutting tool having a long shape, vibration is easily generated by cutting force, thereby causing noise.

In addition, when cutting the workpiece directly, there is a problem that the life of the insert which is the cutting edge is abnormally shortened. Even when cutting is impossible due to vibration, it frequently occurs.

Conventionally, patent documents 1 and 2 mentioned later are known as a technique comprised for the purpose of dustproofing to a cutting tool.

Patent document 1 is a structure which forms a cylindrical pocket in a tool holder, arrange | positions a damping means in the cylinder shape, and assembles by screwing a stopper to a cylindrical edge part. The O-ring is disposed on the outer circumferential surface of the damping means so that the outer circumferential surface of the damping means is spaced apart from the inner circumferential surface of the cylindrical shape. Looking at the action, a tool for performing substantial cutting is installed on the stopper side, the vibration (or shock) is transmitted from the tool side and canceled in the damping means.

However, in the dustproof structure described in Patent Document 1, since the tool holder and the stopper are screw fastening structures, a distance equal to the length of the screw for fastening is necessary, and the distance from the vibration source to the damping means is reduced by that distance, thereby reducing the vibration damping effect. There is a problem.

Patent document 2 is a structure in which a cylindrical damper is disposed on the outer circumferential surface of a circular tube, and a rubber ring is disposed between the tube and the damper to damp the vibration (or shock) transmitted to the tube by the damper.

However, the dustproof structure described in Patent Document 2 has a problem in that the rigidity is relatively weak as a structure supported by a circular tube.

On the other hand, Patent Documents 1 and 2 attempt to counteract the impact or vibration acting in the transverse direction (radial direction) with respect to the center of rotation of the cutting tool, but in the axial direction (the direction parallel to the center of rotation). There is a problem that there is little vibration reduction effect on the shock or vibration applied.

Therefore, there is a need for a dustproof structure that can suppress vibration (vibration) even if the length of the cutting tool is long.

In particular, as the shape of the cutting process is diversified, the direction in which the impact or vibration is applied to the cutting tool may be combined, for example, in the transverse direction and the axial direction.

Republic of Korea Patent Publication No. 10-2009-0107974 (2009.10.14.) International Publication No. WO92 / 14947 (1992.09.03.)

Therefore, the technical problem to be achieved by the present invention is to provide attenuator as close as possible to the vibration source where vibration occurs, so that even if the length of the cutting tool is long, the vibration of the cutting tool can be more effectively dusted and noise can be reduced. The purpose is to provide a dustproof structure.

It is another object of the present invention to provide a dustproof structure of a cutting tool that enables the vibration energy transmitted from the outside to be more quickly transmitted to the attenuator so that the vibration can be attenuated more quickly.

Still another object of the present invention is to provide a dustproof structure of a cutting tool that can cope with such vibration even if the direction in which the vibration is applied is combined with the transverse direction and the axial direction.

It is still another object of the present invention to provide a dustproof structure of a cutting tool in which a damper is disposed in the cutting tool, but the rigidity of the cutting tool is not lowered even when the size of the damper is designed to be relatively large compared to the conventional dustproof technology. 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.

The dustproof structure of the cutting tool according to the present invention for achieving the above technical problem, the first cylinder pocket 110 is formed on the inner side of the first cylinder body 102, the inner end of the first cylinder pocket 110 A first tool holder 100 formed to protrude the first inner cylinder 120; A second cylinder pocket 210 is formed inside the second cylinder body 202, and a second inner cylinder 220 is formed to protrude from an inner end of the second cylinder pocket 210, and the first cylinder body is formed. A second tool holder 200 integrally formed by abutting the first end 140 of the 102 with the second end 240 of the second cylinder body 202; First and second pocket grooves 310 and 320 are recessed at both ends, respectively, and the first and second outer inserts 312 and 322 are respectively disposed outwardly based on the first and second pocket grooves 310 and 320. ) And first and second inner inserts 314 and 324 are formed therein, and the first inner cylinder 120 is inserted into the first pocket groove 310, and the second inner cylinder ( 220 is attenuator 300 is inserted into the second pocket groove 320 to attenuate vibration; A first ring 410 disposed between the outer circumferential surface of the first inner cylinder 120 and the inner circumferential surface of the first pocket groove 310 to contract and restore; And a second ring 420 disposed between the outer circumferential surface of the second inner cylinder 220 and the inner circumferential surface of the second pocket groove 320 to contract and recover.

In addition, the first ring 410 of the dustproof structure of the cutting tool according to the present invention may be disposed between the inner circumferential surface of the first inner cylinder 120 and the first inner insert 314.

In addition, the second ring 420 of the dustproof structure of the cutting tool according to the present invention may be disposed between the inner peripheral surface of the second inner cylinder 220 and the second inner insert 324.

In addition, the first ring 410 of the dustproof structure of the cutting tool according to the present invention is further disposed between the inner peripheral surface of the first inner cylinder 120 and the first inner insert 314,

The second ring 420 may be further disposed between the inner circumferential surface of the second inner cylinder 220 and the second inner insert 324.

In addition, in the dustproof structure of the cutting tool according to the present invention, a first recess pocket 122 is formed on an inner circumferential surface of the first inner cylinder 120 so as to be spaced apart from the first inner insert 314, and the second recess pocket 122 is formed on the inner peripheral surface of the cutting tool. A second recess pocket 222 is formed on an inner circumferential surface of the inner cylinder 220 so as to be spaced apart from the second inner insert 324, so that the attenuator 300 is formed of the first and second tool holders 100 and 200. May not interfere when moving out of phase.

In addition, the dustproof structure of the cutting tool according to the present invention, the end of the first inner insert 314 may be formed to protrude more than the end of the first outer insert 312.

In addition, in the dustproof structure of the cutting tool according to the present invention, a stepped portion is formed on one of an inner circumferential edge of the first end 140 and an inner circumferential edge of the second end 240, and the other end is accommodated in the stepped. The protrusion jaw is formed, and the concentricity between the first tool holder 100 and the second tool holder 200 is improved when the first tool holder 100 and the second tool holder 200 are assembled. May be aligned.

In addition, the dustproof structure of the cutting tool according to the present invention, the first, second, third hole 130, 230 in the center of the first and second tool holders (100, 200) and the damping body 300, respectively , 330 is formed, the cutting oil is passed through the first, second, third holes (130, 230, 330), the attenuator (300) is the first, second by the pressure of the cutting oil An oil film is formed on the surface of the cylinder pockets 110 and 210 so that the first and second inner cylinders 120 and 220 and the first and second pocket grooves 310 and 320 are in contact with each other. It may be.

In addition, the dustproof structure of the cutting tool according to the present invention, the tool length (L1) formed by joining the first cylinder body 102 and the second cylinder body 202 and the length (L2) of the attenuator 300 ) May be 1: 0.3 to 0.7.

In addition, in the dustproof structure of the cutting tool according to the present invention, the ratio of the outer circumferential surface of the first and second cylinder bodies 102 and 202 and the inner circumferential surface of the first and second cylinder pockets 110 and 210 is 1: 0.4. It may be ~ 0.8.

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

The dustproof structure of the cutting tool according to the present invention made as described above is configured by dividing the tool holder up and down, and having a damping body inside the divided tool holder, and the divided tool holder is integrally formed by welding. As a result, the attenuator can be arranged as close as possible to the cause of vibration, thereby making it possible to effectively isolate vibration (vibration) and reduce noise even if the length of the cutting tool is long.

In addition, in the dustproof structure of the cutting tool according to the present invention, by allowing a part of the tool holder to be bound at the side close to the center of the attenuator, vibration energy transmitted from the outside can be transmitted more quickly from the tool holder to the attenuator, thereby vibrating. It is possible to dustproof more quickly.

In addition, in the dustproof structure of the cutting tool according to the present invention, the attenuator is arranged to be able to flow in the transverse direction and the axial direction with respect to the rotational center axis with respect to the rotational direction of the cutting tool, so that the direction in which the vibration is applied is the transverse direction and the axis. Even if the directions are combined, it is possible to cope with the vibration.

In addition, the dustproof structure of the cutting tool according to the present invention, by welding the tool holder separated from the cutting tool to be integrally formed, by placing the attenuator in the tool holder relative to the size of the damper compared to the conventional dustproof technology Even if the design is large, the rigidity of the cutting tool is maintained because the rigidity is maintained by the tool holder.

In addition, the dustproof structure of the cutting tool according to the present invention, it is possible to minimize the intrinsic vibration of the cutting tool by quickly dusting the vibration, it is possible to implement the productivity improvement by the cutting process.

In addition, the dustproof structure of the cutting tool according to the present invention improves the surface roughness of the surface of the cutting process by preventing vibrations, and can prevent the life of the cutting tool and the spindle life from being abnormally shortened.

In addition, the dustproof structure of the cutting tool according to the present invention can realize the economical and high efficiency cutting process by improving the vibration stability by quickly vibration-proof.

1 to 3 are perspective views, exploded views and cross-sectional views for explaining the dustproof structure of the cutting tool according to an embodiment of the present invention.
4 to 6 is a view for explaining the dustproof structure of the cutting tool according to another embodiment of the present invention.
7 and 8 are a perspective view, an exploded view and a cross-sectional view for explaining the dustproof structure of the cutting tool according to another embodiment of the present invention.
9 is a graph illustrating the effect of the dustproof structure of the cutting tool according to the embodiment of the present invention and is shown by analyzing the resonance frequencies of the embodiment and the comparative example.
10 and 11 are graphs for explaining the operation and effect of the dustproof structure of the cutting tool according to an embodiment of the present invention shows a comparison of the decay time of the embodiment and the comparative example.
12 to 14 are graphs for explaining the effect of the dustproof structure of the cutting tool according to an embodiment of the present invention by varying the cutting conditions to show the results by measuring the dynamic vibration of the embodiment and the comparative example.

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.

Like reference numerals refer to like elements throughout the specification.

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, and when the natural frequency gives an external force to the object and the external force is removed, the object continues to vibrate. The speed of vibration is called the “unique frequency”.

Since the cutting tool is made of alloy steel with very high rigidity, the natural frequency is very high (large), which makes it easy to vibrate against external force (cutting force).

The anti-vibration structure of the cutting tool according to an embodiment of the present invention is to provide a damping means to the cutting tool to lower the natural frequency of the cutting tool to suppress the vibration in a condition where vibration is easily generated.

Hereinafter, a dustproof structure of a cutting tool according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 to 3 are a perspective view, an exploded view and a cross-sectional view for explaining the dustproof structure of the cutting tool according to an embodiment of the present invention.

1 to 3, the dustproof structure of the cutting tool according to an embodiment of the present invention is disposed between the first tool holder 100 and the second tool holder 200, attenuator 300 The ends of the first tool holder 100 and the second tool holder 200 are welded (see welding section 500) to be integrated.

The attenuator 300 may be a high density steel having a higher density than the first and second tool holders 100 and 200. For example, the attenuator 300 may use a high density material having a specific gravity of 16 or more.

The first tool holder 100 may be a portion corresponding to the tool shank in the cutting tool, and the second tool holder 200 may be a portion corresponding to the cutting portion for performing the cutting process.

In the first tool holder 100, a first cylinder pocket 110 is formed inside the first cylinder body 102, and a first inner cylinder 120 protrudes from an inner end of the first cylinder pocket 110. Is formed.

The first recess pocket 122 is formed on the inner circumferential surface of the first inner cylinder 120, and the first ring groove 124 is formed on the outer circumferential surface of the first inner cylinder 120.

The second tool holder 200 has a second cylinder pocket 210 formed inside the second cylinder body 202, and a second inner cylinder 220 protrudes from the inner end of the second cylinder pocket 210. Is formed.

A second recess pocket 222 is formed on an inner circumferential surface of the second inner cylinder 220, and a second ring groove 224 is formed on an outer circumferential surface of the second inner cylinder 220.

Meanwhile, the inner circumferential surface of the first cylinder pocket 110 and the inner circumferential surface of the second cylinder pocket 210 may have the same or equivalent size.

The attenuator 300 is formed in a cylindrical shape, and both ends thereof have first and second pocket grooves 310 and 320 formed in a concave cylindrical shape. That is, the end of the attenuator 300 has first and second outer inserts 312 and 322 formed on the outer side of the first and second pocket grooves 310 and 320, and the first and second inside thereof. Inner inserts 314 and 324 are formed.

Meanwhile, the first and second ring grooves 124 and 224 are mounted with the first and second rings 410 and 420, respectively. The first and second rings 410 and 420 may be materials of elastic deformation having elasticity to be restored after being distorted when an external force is applied. For example, the first and second rings 410 and 420 may be made of rubber or synthetic resin having elasticity.

In addition, the first and second ring grooves 124 and 224 and the first and second rings 410 and 420 described above may be provided in plural, and the first and second ring grooves 124 and 224 may be provided. The first and second rings 410 and 420 serve to align and store the parts so that they do not deviate.

Both ends of the attenuator 300 are inserted into the first cylinder pocket 110 and the second cylinder pocket 210, respectively. Meanwhile, the first inner cylinder 120 is inserted into the first pocket groove 310, and the second inner cylinder 220 is inserted into the second pocket groove 320.

In addition, the first inner insert 314 is inserted into the first recess pocket 122, and the second inner insert 324 is inserted into the second recess pocket 222.

That is, when the attenuator 300 is assembled to the first and second tool holders 100 and 200, as shown in FIG. 3, the end of the attenuator 300 and the first and second tool holders 100 are illustrated. ), 200) and zigzag form overlapping forms.

Meanwhile, the first and second rings 410 and 420 are disposed to contact the inner circumferential surfaces of the first and second pocket grooves 310 and 320. As a result, the attenuator 300 is freely flowable because the first and second tool holders 100 and 200 are disposed through the first and second rings 410 and 420.

On the other hand, the ends of the first tool holder 100 and the second tool holder 200 are welded to form a weld 500, whereby the first tool holder 100 and the second tool holder 200 are integrally formed. do.

On the other hand, a gap is formed between the outer circumferential surface of the attenuator 300 and the inner circumferential surfaces of the first and second cylinder pockets 110 and 210. An interval between the attenuator 300 and the first and second cylinder pockets 110 and 210 may be 0.5 mm to 5 mm.

Attenuator 300 is a relative motion is implemented with respect to the vibration of the first, second tool holders (100, 200) to be shaken in reverse phase to the vibration of the first, second tool holders (100, 200).

At this time, if the distance between the damping member 300 and the first and second cylinder pockets 110 and 210 is 0.5 mm or more, the damping member 300 is the first and second tool holders when the damping member 300 is shaken. 100, 200) may not range. On the other hand, if the distance between the damping member 300 and the first and second cylinder pockets 110 and 210 is 5 mm or less, the outer circumferential surface size of the damping member 300 can be set to the maximum, thereby increasing the mass of the damping member 300. Can be designed or provided at maximum.

In addition, a gap is formed between the outer circumferential surface of the first and second inner inserts 314 and 324 and the inner circumferential surface of the first and second recess pockets 122 and 222. That is, the above-described intervals may be a space in which vibration is transmitted from the outside to allow the attenuator 300 to flow.

On the other hand, when the first and second tool holders 100 and 200 are joined, the distance from the inner end of the first cylinder pocket 110 to the inner end of the second cylinder pocket 210 is determined by the attenuation body 300. It may be provided larger than the length. In addition, the depths of the first and second recess pockets 122 and 222 are provided to be greater than the heights of the first and second inner inserts 314 and 324. This ensures a space in which the attenuator 300 can flow in the longitudinal direction.

Meanwhile, the first and second holes 130 and 230 may be formed in the centers of the first and second tool holders 100 and 200, respectively, and the third holes 330 may be formed in the center of the attenuator 300. ) May be formed. Cutting oil or cooling oil may flow through the first, second, and third holes 130, 230, and 330. The coolant or coolant may be provided through the spindle of the machine tool on which the cutting tool is mounted, and the coolant or coolant may be provided to the cutting insert and the workpiece.

On the other hand, the cutting oil or the cooling oil described above flows with pressure, and the pressure is uniformly applied to the first and second recess pockets 122 and 222 and the attenuator 300. Such a pressure may act to float the damping member 300, and in particular, the surface of the first and second inner cylinders 120 and 220 and the first and second pocket grooves 310 and 320 contact with each other. It is possible to form an oil film. As a result, the oil film may flow more freely from the first and second tool holders 100 and 200, thereby further improving the damping effect.

On the other hand, the cross-sectional shape of the first and second inner cylinders 120 and 220 described above may have a curvature in a semicircular shape. As a result, the area in which the first and second tool holders 100 and 200 and the attenuator 300 contact each other can be reduced to a minimum. As the contact area is minimized, the frictional resistance may be further reduced when the attenuator 300 flows, so that the attenuator 300 may flow more freely, thereby further improving the attenuation effect.

In addition, a first end 140 is formed at an end of the first cylinder body 102 in an inclined cross-sectional shape, and a second end is formed at an end of the second cylinder body 202 in an inclined cross-sectional shape. 240 may be formed. This allows the welding to be made more smoothly when performing the welding.

On the other hand, first and second alignment guides 142 and 242 may be formed at inner corners of the first and second ends 140 and 240, and the first and second alignment guides 142 and 242 may be formed. When welding the first tool holder 100 and the second tool holder 200 to each other, concentricity or straightness can be improved between the first tool holder 100 and the second tool holder 200.

When the first and second alignment guides 142 and 242 have a cross-sectional shape, one of the first and second alignment guides 142 and 242 may be formed to be concave to the stepped jaw and the other may be formed to correspond to the stepped jaw. The first tool holder 100 and the second tool holder 200 are guided to be aligned when assembled.

Meanwhile, as shown in FIG. 3, the cutting tool may have a ratio of the tool length L1 and the length L2 of the attenuator 300 to be 1: 0.3 to 0.7. In detail, when the length L2 of the attenuator 300 is 30% or more with respect to the tool length L1, the dustproof performance is satisfactorily implemented. In addition, when the length L2 of the attenuator 300 is 70% or less with respect to the tool length L1, the rigidity of the cutting tool is good.

That is, as described above, the dust-proofing performance and the rigidity of the cutting tool may be optimally implemented in the range of the length L2 of the attenuator 300 in the range of 30% to 70% with respect to the tool length L1.

The tool length L1 described above will be explained in detail. The cutting tool is formed with a tool shank mounted to the spindle of the machine tool, which is a section from the lower side of the tool shank to the lower end of the cutting tool, and the first tool holder 100. The length of the section of the first cylinder body 102 and the second cylinder body 202 of the second tool holder 200 formed in FIG.

In addition, a ratio between the outer circumferential surfaces of the first and second cylinder bodies 102 and 202 and the inner circumferential surfaces of the first and second cylinder pockets 110 and 210 may be 1: 0.4 to 0.8. In detail, when the inner circumferential surfaces of the first and second cylinder pockets 110 and 210 are in a ratio of 40% or more to the outer circumferential surfaces of the first and second cylinder bodies 102 and 202, the dustproof performance is satisfactorily realized. In addition, when the inner circumferential surface of the first and second cylinder pockets 110 and 210 is less than 80% of the outer circumferential surfaces of the first and second cylinder bodies 102 and 202, the rigidity of the cutting tool is good.

That is, as described above, the inner peripheral surfaces of the first and second cylinder pockets 110 and 210 are in the range of 40% to 80% to the outer peripheral surfaces of the first and second cylinder bodies 102 and 202, so that Rigid performance can be optimally implemented.

4 to 6 is a view for explaining the dustproof structure of the cutting tool according to another embodiment of the present invention.

4 is another embodiment of the present invention, in which the first recess pocket 122 is further extended and provided in the first tool holder 100, and the first inner insert ( 314).

That is, the first inner insert 314 is formed to protrude in comparison with the first outer insert 312 to increase the mass m of the attenuator 300, thereby further improving the vibration damping effect.

1 to 4 is a form in which the cutting tool to which the dustproof structure is applied according to an embodiment of the present invention is rotated, but may also be applied to the machining of the workpiece in a state in which the workpiece moves in a stopped state, such as turning. This will be described with reference to FIGS. 5 and 6.

Figure 5 shows another embodiment of the present invention, showing an example of applying the dustproof structure to the cutting tool that can be used in turning.

That is, the first and second tool holders 100 and 200 become tool holders for turning tools, and the first and second ring holders 410 and 420 inside the first and second tool holders 100 and 200. Attenuator 300 that can be freely flowed by the is provided.

During turning, the cutting force is transmitted from the cutting insert and the cutting force causes vibration, but the vibration is transmitted to the attenuator 300, in particular, directly at the center of the attenuator 300 so that the damping effect is reduced. It is further improved.

6 shows an embodiment of a cutting tool to which another dustproof structure of the present invention is applied. In the embodiment of the cutting tool to which the dustproof structure shown in FIG. 5 is applied, an embodiment in which the mass (m) of the damping member 300 is applied to a larger size is applied. It is an example.

That is, the first and second tool holders 100 and 200 become tool holders for turning tools, and the first and second ring holders 410 and 420 inside the first and second tool holders 100 and 200. Attenuator 300 that can be freely flowed by the is provided. In particular, the embodiment of the cutting tool shown in FIG. 6 forms a larger (longer) first recess pocket 122 in the first tool holder 100, and the first inner insert 314 is formed with a first outer insert ( It is formed to protrude in comparison with 312).

Therefore, the cutting tool to which the anti-vibration structure according to the embodiment of the present invention shown in FIG. 6 is set to have a large mass (m) of the attenuator 300, thereby further improving the vibration damping effect.

7 shows an embodiment of a cutting tool to which another dustproof structure of the present invention is applied. In the embodiment of the cutting tool to which the dustproof structure shown in FIGS. 1 to 3 is applied, the first and second rings 410 and 420 This is an example of changing the arrangement position.

As shown in FIG. 7, the first ring groove 124 is formed on the inner circumferential surface of the first inner cylinder 120. In addition, a second ring groove 224 is formed on the inner circumferential surface of the second inner cylinder 220.

The first and second ring grooves 124 and 224 are provided with first and second rings 410 and 420, respectively.

That is, the first and second rings 410 and 420 described above are disposed between the first and second inner cylinders 120 and 220 and the first and second inner inserts 314 and 324.

FIG. 8 shows an embodiment of a cutting tool to which another dustproof structure of the present invention is applied. The first and second rings 410 and 420 of the cutting tool to which the dustproof structure shown in FIGS. This is an example of changing the arrangement position.

As illustrated in FIG. 8, a first ring groove 124 may be formed on the inner and outer circumferential surfaces of the first inner cylinder 120. In addition, a second ring groove 224 may be formed on the inner circumferential surface and the outer circumferential surface of the second inner cylinder 220.

Meanwhile, when the first and second grooves 124 and 224 are formed on the inner and outer circumferential surfaces of the first and second inner cylinders 120 and 220, the grooves formed on the inner circumferential surface and the grooves formed on the outer circumferential surface are viewed in cross section. At this time, they may be formed in positions deviated from each other in a zigzag form. Thereby, rigid fall can be prevented.

The first and second ring grooves 124 and 224 are provided with first and second rings 410 and 420, respectively.

That is, the above-mentioned first and second rings 410 and 420 are disposed between the first and second inner cylinders 120 and 220 and the first and second outer inserts 312 and 322, and further, It may be arranged between the first and second inner cylinders 120 and 220 and the first and second inner inserts 314 and 324.

On the other hand, the dustproof structure of the cutting tool according to an embodiment of the present invention in the form that the first, second rings 410, 420 are symmetrical to the first tool holder 100 and the second tool holder 200 Although an example of arrangement is described, the present invention is not limited thereto. For example, the first tool holder 100 may include the first ring 410 disposed only on either the inner circumferential surface side or the outer circumferential surface side of the first inner cylinder 120. In addition, the second ring holder 420 may be disposed on both the inner and outer circumferential surfaces of the second inner cylinder 220 in the second tool holder 200.

On the other hand, a first ring 410 is disposed on both the inner circumferential surface and the outer circumferential surface of the first inner cylinder 120 on the first tool holder 100, and the second inner cylinder 220 on the second tool holder 200. The second ring 420 may be disposed only on either of the inner and outer circumferences of the "

As described above, the attenuator 300 does not directly contact the first tool holder 100 or the second tool holder 200 by further disposing the first and second rings 410 and 420 or by arranging them in duplicate. You can do that.

As described above, the dustproof structure of the cutting tool according to the embodiment of the present invention has a high degree of freedom in design by welding the first tool holder 100 and the second tool holder 200 to increase the internal space (first, The second cylinder pocket can be secured largely and a simple configuration can be achieved.

In addition, the dustproof structure of the cutting tool according to the embodiment of the present invention has the convenience of designing / providing a large size of the attenuator 300, and the attenuator 300 and the first and second rings 410, It is possible to freely set the appropriate position where the 420 will be placed. In detail, the first and second rings 410 and 420 may be deformed by the heat generated during the welding. However, the first and second cylinder pockets 110 may be internal spaces. , 210 may be secured so that the first and second rings 410 and 420 may be disposed at positions not to be affected by the welding heat source.

On the other hand, the welding carried out in the present invention can be carried out in a low temperature welding method, it is possible to prevent the damage of the first, second ring (410, 420) by the welding heat source.

On the other hand, as the size of the attenuator 300 increases, the attenuator 300 is shaken in an inverse phase with respect to the phase of the vibration generated in the first tool holder 100 or the second tool holder 200 and the cutting tool body. Can effectively reduce vibration.

Hereinafter, the vibration damping effect of the cutting tool to which the dustproof structure of the cutting tool is applied according to an embodiment of the present invention will be described with reference to FIGS. 9 to 14.

The product used in the comparative example is to compare the product of the same outer dimensions as the embodiment of the present invention.

9 is a graph illustrating FRF frequency analysis by measuring a resonance frequency as a graph for explaining an operation effect of the dustproof structure of a cutting tool according to an exemplary embodiment of the present invention.

As shown in FIG. 9, the cutting tool to which the anti-vibration structure according to the embodiment of the present invention is applied has a slight acceleration displacement even though the displacement of the resonance frequency changes. For example, it can be seen that in the range of 2,000 Hz to 2,500 Hz, the acceleration changes rapidly forming a peak.

That is, it can be seen that the cutting tool to which the anti-vibration structure is applied according to an embodiment of the present invention is stable even when the resonance frequency is changed greatly.

10 and 11 are graphs for explaining the effect of the dustproof structure of the cutting tool according to the embodiment of the present invention. More specifically, Figure 10 is a comparative example, Figure 11 is an embodiment of the present invention.

As can be seen in Figures 10 and 11 it can be seen that the difference from the moment from the time the shock occurs to the time that the shock is extinguished and stabilized.

In the comparative example, an impact in the range of about +120 Hz to -180 Hz was applied, and the time required for the vibration to be extinguished takes about 0.04 seconds. On the other hand, the embodiment of the present invention takes approximately 0.01 seconds until the shock is applied in the range of approximately +100 kHz to -160 kHz until the vibration is generated. That is, the cutting tool to which the embodiment of the present invention is applied can be seen that the time required for vibration attenuation is significantly shortened compared to the cutting tool to which the comparative example (prior art) is applied.

Hereinafter, an operation effect may be described by graphically expressing a correlation between the machining speed VC and the real-time acceleration RMS during cutting conditions, which will be described with reference to FIGS. 12 to 14.

12 to 14 are graphs for explaining the effect of the dustproof structure of the cutting tool according to an embodiment of the present invention by varying the cutting conditions to perform a dynamic vibration test of the embodiment and the comparative example in real time acceleration ( m / s ^ 2 / N) is a graph that shows the average value (RMS).

In the graph shown in Fig. 12, the cutting conditions are applied: cutter: φ63 face mill, number of cutter edges: 3 blades, Fz (feed amount per blade): 0.05 (mm / tooth), side cut: 50 mm, Z axis cut: 3 mm.

In the graph shown in Fig. 13, the cutting conditions are applied cutter: Φ 63 face mill, number of cutter blades: 3 blades, Fz (feed amount per blade): 0.1 (mm / tooth), side cut: 50 mm, Z axis cut: 3 mm.

In the graph shown in Fig. 14, the cutting conditions are applied cutter: Φ63 face mill, number of cutter blades: 3 blades, Fz (feed amount per blade): 0.2 (mm / tooth), side cutting: 50 mm, Z axis cutting: 3 mm.

Looking at the graph shown in Figures 12 to 14, it can be seen that the embodiment according to the present invention is relatively small generation of vibration compared to the comparative example, which is the effect of the dust-proof action by the dust-proof structure according to the embodiment of the present invention It can be seen that excellent.

As described above, the dustproof structure of the cutting tool according to the embodiment of the present invention is configured by dividing the tool holder up and down, and the attenuator 300 inside the divided first and second tool holders 100 and 200. The first and second tool holders 100 and 200, which are divided and configured to be integrally formed by welding, can be disposed as close as possible to the attenuator 300 to cause vibration, thereby reducing the length of the cutting tool. Even longer, vibration can be effectively discharged and noise can be reduced.

In addition, in the dustproof structure of the cutting tool according to the embodiment of the present invention, the vibration energy transmitted from the outside by allowing a portion of the first and second tool holders 100 and 200 to be bound at a side close to the center of the attenuator 300. The first and second tool holders 100 and 200 may be transmitted more rapidly toward the damping member 300, thereby allowing the vibration to be more quickly released.

In addition, the dustproof structure of the cutting tool according to an embodiment of the present invention, the vibration is applied by the attenuator 300 is disposed in the transverse direction and the axial direction with respect to the central axis of rotation relative to the rotation direction of the cutting tool. Even if the direction is combined with the transverse direction and the axial direction, the vibration can cope with such vibration.

In addition, in the dustproof structure of the cutting tool according to the embodiment of the present invention, the first and second tool holders 100 and 200 separated from the cutting tool are welded to be integrally formed, and the damping member 300 is formed in the tool holder. By arranging, even if the size of the attenuator 300 is designed to be relatively large compared to the conventional anti-vibration technique, since the rigidity is maintained by the tool holder, a good anti-vibration effect can be expected without reducing the rigidity of the cutting tool.

In addition, the dustproof structure of the cutting tool according to an embodiment of the present invention, it is possible to minimize the intrinsic vibration of the cutting tool by quickly dusting the vibration, it is possible to implement the productivity improvement by the cutting process.

In addition, the dustproof structure of the cutting tool according to the embodiment of the present invention improves the surface roughness of the surface of the cutting process by preventing vibration, and can prevent the life of the cutting tool and the spindle life from being abnormally shortened.

In addition, the dustproof structure of the cutting tool according to the embodiment of the present invention can realize the economical and high efficiency cutting process by improving the processing stability by quickly dusting 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 dustproof structure of the cutting tool according to the present invention can be used to dust the vibration due to the cutting force when performing the cutting process.

100, 200: first and second tool holders
102, 202: first and second cylinder bodies 110 and 210: first and second cylinder pockets
120, 220: 1st, 2nd inner cylinder 122, 222: 1st, 2nd recess pocket
124, 224: first and second ring grooves 130, 230: first and second holes
140, 240: first and second end portions 142, 242: first and second alignment guides
300: attenuator 310, 320: first, second pocket groove
312, 322: first and second outer inserts 314, 324: first and second inner inserts
330: third hole 410, 420: first and second ring
500: weld

Claims (10)

The first cylinder holder 110 is formed inside the first cylinder body 102, and the first tool holder 100 is formed such that the first inner cylinder 120 protrudes from the inner end of the first cylinder pocket 110. ;
A second cylinder pocket 210 is formed inside the second cylinder body 202, and a second inner cylinder 220 is formed to protrude from an inner end of the second cylinder pocket 210, and the first cylinder body is formed. A second tool holder 200 integrally formed by abutting the first end 140 of the 102 with the second end 240 of the second cylinder body 202;
First and second pocket grooves 310 and 320 are recessed at both ends, respectively, and the first and second outer inserts 312 and 322 are respectively disposed outwardly based on the first and second pocket grooves 310 and 320. ) And first and second inner inserts 314 and 324 are formed therein, and the first inner cylinder 120 is inserted into the first pocket groove 310, and the second inner cylinder ( 220 is attenuator 300 is inserted into the second pocket groove 320 to attenuate vibration;
A first ring 410 disposed between the outer circumferential surface of the first inner cylinder 120 and the inner circumferential surface of the first pocket groove 310 to contract and restore; And
A second ring 420 disposed between the outer circumferential surface of the second inner cylinder 220 and the inner circumferential surface of the second pocket groove 320 to contract and recover;
Dustproof structure of the cutting tool comprising a.
The method of claim 1,
The first ring 410 is disposed between an inner circumferential surface of the first inner cylinder 120 and the first inner insert 314;
Dustproof structure of the cutting tool, characterized in that.
The method of claim 1,
The second ring 420 is disposed between an inner circumferential surface of the second inner cylinder 220 and the second inner insert 324;
Dustproof structure of the cutting tool, characterized in that.
The method of claim 1,
The first ring 410 is further disposed between the inner circumferential surface of the first inner cylinder 120 and the first inner insert 314,
The second ring 420 is further disposed between an inner circumferential surface of the second inner cylinder 220 and the second inner insert 324;
Dustproof structure of the cutting tool, characterized in that.
The method of claim 1,
A first recess pocket 122 is formed on an inner circumferential surface of the first inner cylinder 120 to be spaced apart from the first inner insert 314.
A second recess pocket 222 is formed on an inner circumferential surface of the second inner cylinder 220 so as to be spaced apart from the second inner insert 324.
Dust damping structure of the cutting tool, characterized in that the attenuator 300 does not interfere when the anti-phase movement relative to the first, second tool holder (100, 200).
The method of claim 1,
An end portion of the first inner insert (314) is formed to protrude more than the end portion of the first outer insert (312).
The method of claim 1,
One of the corners of the inner circumferential surface of the first end 140 and the inner circumferential surface of the second end 240 is formed with a stepped jaw, and the other side has a protruding jaw accommodated in the stepped jaw,
When the first tool holder 100 and the second tool holder 200 is assembled, the concentricity between the first tool holder 100 and the second tool holder 200 is improved to be aligned. Dustproof structure of cutting tools.
The method of claim 1,
First, second and third holes 130, 230, and 330 are formed in the centers of the first and second tool holders 100 and 200 and the damper 300, respectively. The cutting oil passes through the third holes 130, 230, and 330, and the attenuator 300 floats inside the first and second cylinder pockets 110 and 210 by the pressure of the cutting oil. And an oil film is formed on a surface of the first and second inner cylinders (120, 220) and the first and second pocket grooves (310, 320).
The method of claim 1,
The ratio of the tool length L1 formed by joining the first cylinder body 102 and the second cylinder body 202 to the length L2 of the attenuator 300 is 1: 0.3 to 0.7. Dustproof structure of cutting tool.
The method of claim 1,
The dustproof structure of the cutting tool, characterized in that the ratio of the outer circumferential surface of the first and second cylinder body (102, 202) and the inner circumferential surface of the first and second cylinder pocket (110, 210) is 1: 0.4 to 0.8.

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