KR100466509B1 - Cutting wheel with blanks and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A cutting wheel with a penetration groove and a manufacturing method thereof are provided to increase the rigidity, and to prevent friction noise and wobbling in cutting difficult-to-cut materials or the work piece such as wood by charging the noise absorbing material. CONSTITUTION: Plural penetration grooves(18) are formed in a wheel body(13) of a cutting wheel, and the width of the penetration groove is variably changed. A noise absorbing material is charged in the penetration groove of the wheel body. The variable width portions are formed in the center and at both ends of the penetration groove, and the penetration groove is arranged across the radiation of the wheel body. The adhesive is spread on the inner wall of the penetration groove, and the noise absorbing material is charged in the penetration groove. The materials such as stone, steel concrete, asphalt, metal or ceramic and the work piece such as wood are cut and processed without friction noise and vibration.

Description

Cutting wheel with through groove and manufacturing method therefor {CUTTING WHEEL WITH BLANKS AND MANUFACTURING METHOD THEREOF}

The present invention relates to a cutting wheel formed with a through groove and a method of manufacturing the same, and more particularly, to a diamond cutting wheel or wood for cutting or processing a workpiece of a difficult material such as stone, reinforced concrete, asphalt, metal and ceramics. Cutting wheels with through grooves that can maximize the visual appearance of the wheels while reducing vibration and friction noise generated when using cutting wheels with carbide tips for cutting workpieces such as plastics and plastics It is about a method. Hereinafter, the cutting wheel has been found to be a concept including both a diamond cutting wheel or a cutting wheel having a cemented carbide tip.

In general, the cutting wheel, as shown in Figure 1, the mixed powder of diamond and metal on the outer peripheral surface of the partition divided by the recessed groove 12 formed radially constant on the outer peripheral surface of the disk-shaped wheel body 10 The cutting tip 20 manufactured by press molding and then sintered and the cutting tip 20 made of cemented carbide are used to cut workpieces such as stone, reinforced concrete, asphalt, metal, ceramic, and wood. Since the cutting wheel rotates at a rotational speed of several hundred to thousands of RPMs, the cutting work is performed by rubbing the workpiece, and its working noise level is generally higher than 100 dB, and the frictional heat generated by the friction has a great influence on the life of the cutting wheel. The situation is going crazy.

In particular, as the cutting depth of the workpiece to be cut deepens, the contact surface of the cutting portion of the workpiece and the cutting wheel increases, and the increase of the contact surface increases the frictional heat and the impact and friction generated from the body 10 of the wheel. Noise has been dramatically increased and has been pointed out as the most important factor that increases the burden on the worker. As a conventional technology for reducing the noise of the cutting wheel, as shown in Figure 2, the detento penetrating groove of a predetermined shape that is a combination of curves and straight lines that can absorb or block the noise on the surface of the wheel body 10 ( It is common to form detenso blanks.

That is, as shown in FIG. 2, the conventional detento penetrating groove 11 processes the penetrating groove 11 linearly with a laser cutting technique on the wheel body 10 to fill silicon with its fine internal space. However, as the use time of the cutting wheel increases, the silicon filled in the internal space is dropped from the space part of the through groove 11 by impact, vibration, or frictional heat, so that the noise reduction effect is lowered than the initial stage. This is happening.

In addition, the through groove 11 formed in the wheel body 10 in a conventional manner is formed so that the size of the inner space is small and can not cross any radiation from the center of the wheel body 10. Therefore, the noise reduction in all directions of the wheel to reduce the noise is not so high that a lot of noise occurs.

On the other hand, in order to solve the problems of frictional heat and friction noise of the general cutting wheel shown in Figure 1, the cutting wheel as shown in Figures 3 and 4 is known.

First, as shown in Figure 3, the Republic of Korea Utility Model Publication No. 1999-0040662 has a regular interval or irregular coupling holes 30 of the same shape or different size or shape in the disk-shaped body 10 The cutting wheel is coupled to the low melting point metal 40 in a sintering or press molding method to reduce the friction noise and vibration noise due to rotational friction during cutting or processing of the workpiece.

However, as described above, the cutting wheel structure for filling the low melting point metal 40 in the plurality of coupling holes 30 in the body 10 can reduce the friction noise generated to some extent, but the wheel body 10 It is impossible to absorb and reduce the friction noise generated in all directions of the wheels because all of the radiation from the center of the center to the outside and the coupling hole 30 formed cannot intersect. In addition, in this technique, if a series of engaging holes 30 are formed in the body 10 to intersect any radiation directed from the center of the wheel body 10 to the outside, the strength of the wheel body 10 is lowered and thus easily used during use. Breaking problems will occur.

On the other hand, as a more fundamental way to improve the noise reduction performance of the cutting wheel, the sandwich wheel body 10a shown in Figure 4 has been developed and used.

That is, a sandwich-type wheel body 10a was developed by spot welding by inserting a copper plate 10b having excellent thermal conductivity and noise attenuation ability between the steel wheel body 10a as a pair. I use it. However, this results in a cost increase of at least two to three times higher than the manufacturing cost of the existing wheel body 10, and at the same time the thickness of the steel wheel body 10a, which is located on both sides, is thin and the copper plate 10b is located at the center. Since the strength of the c) is remarkably low, the wobbling phenomenon of the wheel body 10a fluttering and fluttering during use may occur, and thus, a good cutting may not be performed. Moreover, even if the cutting is made, the plastic deformation of the wheel is easily generated, thereby reducing the service life of the wheel.

In order to solve the above problems of the prior art, the present invention forms a through-groove including a portion having a constant width or a part of a wide width in the wheel body, and filling a predetermined noise absorbing material in the inner space thereof to a certain level or more strength. It is an object of the present invention to provide a cutting wheel and a method for manufacturing the same, in which a through groove is formed, which can significantly reduce frictional noise while maintaining a.

1 is a front view showing a general cutting wheel;

2 is a front view illustrating a conventional cutting wheel having various through grooves formed therein;

3 is a front view showing a conventional cutting wheel filled with metal powder in a coupling hole formed in the wheel body;

4 is a perspective view showing a noise reduction cutting wheel using a sandwich wheel body;

5 is a front view showing a cutting wheel formed with a through groove according to the present invention;

Figure 6 is a functional diagram showing an operating state of the cutting wheel formed with a through groove according to the present invention;

7 and 8 are a front view showing another embodiment of a cutting wheel formed with a through groove according to the present invention.

<Description of Symbols for Main Parts of Drawings>

12: recessed groove

13: Wheel body

14: noise absorber

18, 18b: through groove

19: radiation

20: cutting tip

22: center of body

In order to achieve the above object, there is provided a through groove formed to intersect at least one or more of the arbitrary radiation of the wheel body, and the cutting wheel is filled with the noise absorbing material in the through groove.

The present invention also provides a cutting wheel formed such that one end of each of the through grooves and the adjacent through grooves is crossed by the same radiation.

In addition, the present invention is characterized in that the through groove is curved, but includes a portion formed in a variable width, the wide portion is to provide a cutting wheel formed at both ends and the center of the through groove.

In addition, the present invention is the noise absorbing material to be filled in the through groove is any one selected from urethane, thermosetting resin or metal powder, or a mixture of two or more thereof, and the metal powder is selected from copper or copper alloy powder To be selected.

On the other hand, the present invention comprises the steps of forming a plurality of through grooves to cross at least one or more of the arbitrary radiation of the wheel body, preparing a noise absorber to be filled in the through groove, and filling the through groove with the noise absorber It provides a method of manufacturing a cutting wheel comprising a.

In addition, the present invention applies an adhesive to the inner wall of the through groove before filling the through-hole with the sound absorbing material.

In addition, the present invention is to prepare a sound absorbing material by mixing a urethane or thermosetting resin, a metal powder with a curing agent 1: 1, in particular a urethane or thermosetting resin 1: 1 with a curing agent, and then a metal powder 1: Mixing at 1.5 prepares a sound absorber. Here, the mixing ratio of the metal powder and the curing agent, the mixing ratio of the urethane or the thermosetting resin and the curing agent, and the like may be arbitrarily sufficiently changed to obtain the use condition and the desired noise damping effect.

In addition, the present invention is the noise absorbing material prepared in the through groove is filled depending on the material, but in the case of urethane is cured by heating by heating in the range of 1 to 6 hours at 70 ~ 150 ℃.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention.

Figure 5 is a front view showing a cutting wheel formed with a through groove according to the present invention. As shown in FIG. 5, the cutting wheel formed with the through groove according to the present invention is such that the through groove 18 is laser cut so as to intersect any radiation 19 from the center 22 of the wheel body 13. It is formed by precise technology such as press through method. That is, the through groove 18 is formed to meet all the radiation 19 when the radiation 19, which is an arbitrary direction line from the body center 22 to the outer diameter of the wheel, is drawn. The through groove 18 is formed based on the curved S-shape, and can be variously applied. In addition, the number of the formed grooves is appropriately in consideration of noise generation and application strength according to the use of the cutting wheel. Select to form.

In particular, it is important that the through groove is formed such that one end of each of the through grooves and the adjacent through grooves is crossed by the same radiation. That is, it is important to have one end groove and each end portion of the neighboring through groove overlap each other in the direction of the outer diameter portion from the center of the cutting wheel, which is to avoid the impact and friction caused by the contact of the workpiece at the outer diameter of the wheel when using the cutting wheel. This is to block all noise generated and propagated by the system. That is, if the end portions of each of the through grooves and neighboring through grooves do not overlap with each other, the noise and vibration generated by this portion are propagated to generate friction noise, so that they are formed to overlap each other. However, in consideration of the strength of the wheel body 13, the through grooves 18 are formed by appropriately setting the distance at which the respective end portions of one through groove and the adjacent through groove overlap each other.

In addition, another feature of the through groove 18 formed in the present invention is its shape. Since the conventional through grooves are uniformly formed in a narrow linear shape, there is a limit in absorbing friction noise and vibration. In the through groove 18 is characterized in that the width is formed of a narrow linear formed at a predetermined interval, and a predetermined predetermined wide space portion formed continuously. That is, when the friction noise generated by the cutting tip 20 of the wheel body 13 and the workpiece is propagated from the outer diameter to the inner diameter, it blocks the penetration noise, and the through grooves 18 to absorb the propagated noise. To form. In other words, the widths of the both ends and the center of the through groove 18 are formed to be wide, and the noise and vibration cut off from the relatively narrow portion 16 are reduced to the noise from which the wide portion 17 propagates from the outer diameter portion. It is formed to absorb at the same time blocking.

More preferably, a wide portion 17 formed at one end of one S-shaped through groove 18 and a wide portion 17 formed at the center thereof are located on a concentric circle 23 centered on the wheel body. At the same time, the wide portion 17 and the wide portion 17 of the distal end portion of the central portion of the S-shaped through grooves 18 adjacent to both sides are formed so as to be located at its concentric circles. In addition, the wide portion 17 of the outermost end of each S-shaped through groove 18 is also positioned on a concentric circle 24 centered on the wheel body.

In the present invention, five S-shaped curved through grooves 18 formed in the shape as described above were formed in a predetermined angular direction with respect to the center of the body 22, and the number of such formations is as described above. The enemy should be selected according to the applied strength of the wheel body 13 and the degree of friction noise according to the environment used.

Another feature of the through grooves 18 formed in accordance with the present invention is that the sound absorbing material 14 is filled in the inner space of the formed grooves 18. That is, the noise reduction rate against the friction noise of the through grooves 18 formed in the wheel body 13 in the form as described above is further improved, and the noise in the space of the through grooves 18 is also considered in consideration of the aesthetics of the wheel. The absorber 14 is filled and used.

The noise absorbing material 14 may be filled by selecting any one of urethane, thermosetting resin, or metal powder. In addition, the urethane and the thermosetting resin may be mixed with the metal powder or filled with the metal powder alone in terms of aesthetics of the cutting wheel, and the metal powder may be any one having a desired melting point or a unique color. Although available, preferably copper or copper alloy powder is used.

As a sound absorbing material 14, a urethane and a thermosetting resin are filled in the through grooves 18 of the wheel body 13 and cured. The urethane or the thermosetting resin and the curing agent are mixed in a predetermined ratio, for example, 1: 1. The grooves 18 were filled and then cured by heating at 70 to 150 ° C. for about 1 to 6 hours. In general, since the inner wall of the through groove 18 and the urethane and the thermosetting resin have low adhesive strength, an adhesive is applied to the joint surface of the through groove 18 and then the urethane and the thermosetting resin are filled in the same manner as described above.

In addition, as described above, the copper may be filled with urethane or thermosetting resin mixed 1: 1 with a curing agent by 1.5 times and then heated and filled in the same manner as described above, and pure copper or copper without mixing urethane and thermosetting resin The metal powder, such as an alloy powder, may be filled in the through groove 18 and then hardened by pressure sintering.

6 is an operation diagram showing an operating state of the cutting wheel formed with a through groove according to the present invention.

When the cutting wheel formed with the through groove according to the present invention is applied to a cutting or processing operation of the workpiece, friction noise and vibration are generated from the workpiece.

As shown in FIG. 6, impact noise, friction noise, and vibration generated between the cutting tip 20 and the workpiece at the outer diameter portion of the wheel may be reduced by the wheel body 13 at the lower portion or the recessed groove 12 of the cutting tip 20. To the direction of the center of the wheel 21, reflected back from the fastening hole with the power tool to the outer diameter portion and the noise and vibration offset and reinforcement interference occurs with each other to generate a large noise at a specific frequency. Therefore, in the present invention, such friction or impact noise and vibration are further propagated by the through groove 18 formed in the wheel body 13 so as to intersect all the radiation 19 from the center 21 of the wheel toward the outer diameter direction. Blocked to prevent That is, the friction noise and vibration generated when the cutting tip 20 of the outer diameter portion of the wheel and the workpiece are impacted to progress toward the center 21 of the wheel, the narrow portion of the through groove 18 of the present invention ( Blocked by the 25, the friction noise and vibration is to be propagated and absorbed to the wide portion (17) formed on both sides of the narrow portion (25). The wider portion 17 is formed with a larger area than the narrower portion 25 and is filled with more noise absorbing material 14, thereby efficiently absorbing noise.

Although the narrow portion 25 and the wide portion 17 of the above-described through groove 18 have both a noise blocking function and a noise absorbing function, they are mainly described as main functions, and the wide portion 17 ) May be formed in more places depending on the application environment of the wheel.

7 and 8 are a front view showing another embodiment of a cutting wheel formed with a through groove according to the present invention. As shown in FIG. 7, the through groove 18a having a constant width along the circumferential direction of the wheel body 13 is formed to intersect any radiation 19 of the wheel body 13, and the through groove 18a. ) May be filled with a sound absorbing material 17. Further, as shown in FIG. 8, the through grooves 18b are formed to intersect any radiation 19 of the wheel body 13 along the circumferential direction at regular intervals in the wheel body 13, the width of which It may be formed in a shape that is uniformly narrow along the direction, the sound absorbing material 17 can be filled in the through groove (18b).

The test method for measuring the noise vibration of the cutting wheel according to the present invention has adopted a method for measuring the noise level for a variety of cutting wheels, the cutting wheel structure by the test number and the filling of the through groove, reference is shown in Table 1 below. .

division Cutting wheel shape Reference Remarks TEST 1 General wheel 1 - TEST 2 Conventional Dettenso Wheel1 (B) of FIG. 2 Silicone charge TEST 3 Conventional Detenso Wheel 2 (C) of FIG. 2 Silicone charge TEST 4 Sandwich Wheel 4 Steel plate + copper plate + steel plate TEST 5 The present invention 5 Urethane + Copper Powder Filling

The noise measurement in the test of the present invention was measured by installing a noise measuring instrument (NA-27, RION, JAPAN) at a distance of 1 m from the cutting wheel using a tripod, while being installed at the center of the cutting wheel. Cutting machine equipped with the cutting wheel (Cutting Machine; CEDIMA TABLE SAW CTS-60) used a horsepower of 3 horsepower and up to 3600 RPM. In addition, the workpiece used a fully cured concrete having a width of 300 mm and a thickness of 40 mm for cured concrete.

In the noise measurement method, 10 dry cuts were performed for each test, and each cut was measured using a noise meter for 10 seconds, and then the average value was calculated. The average value for each test was shown in Table 2 below.

Noise measurement result unit: dB division LA _eq 16㎐ 31.5㎐ 63㎐ 125 ㎐ 250 ㎐ 500㎐ 1㎑ 2㎑ 4㎑ 8㎑ Peripheral 69.0 2.0 36.6 51.8 55.7 62.3 64.0 61.5 60.0 57.9 51.9 Idling 87.2 2.0 37.7 51.9 56.0 62.1 64.4 66.9 81.4 85.4 73.8 TEST 1 104.8 2.0 35.3 51.7 62.5 77.1 89.6 89.9 96.1 102.3 97.8 TEST 2 102.8 2.0 39.3 52.1 58.7 74.6 84.3 91.7 95.6 99.7 95.4 TEST 3 104.2 2.0 47.8 52.4 62.5 76.5 86.9 91.3 96.8 101.2 97.2 TEST 4 95.7 2.0 36.7 52.4 63.5 75.8 79.0 86.3 89.9 91.3 88.3 TEST 5 97.8 2.0 34.6 52.0 60.4 74.6 84.9 90.4 89.7 93.1 91.0

* LA _eq (equivalent noise level): continuous noise level with energy equal to this within the measurement time, when the noise level changes with time.

* Perimeter: 2 meters away from the wheel when idle

Table 3 shows the results of comparative analysis of the LA _eq values with respect to the results.

LA _eq value comparison division LA _eq (dB) dB difference ^* (based on TEST 1) Sound pressure ratio ^** (based on TEST 1) Comparison of the noise level (sound pressure) (when the noise of TEST 1 is viewed as 100) TEST 1 104.8 - - 100 TEST 2 102.8 -2.0 10 ^-0.2 = 0.63 63 TEST 3 104.2 -0.6 10 ^-0.06 = 0.87 87 TEST 4 95.7 -9.1 10 ^-0.91 = 0.12 12 TEST 5 97.8 -7.0 10 ^-0.7 = 0.20 20

*: Definition of dB (Decibell)

dB = 10 * log (P1 / P0) (P1: Sound pressure of the measured sound / P0: Reference sound pressure, 2 X 10 ^-5 N / ㎡)

**: Formula (changes dB difference to sound pressure ratio)

10 [dB difference] / 10 = sound pressure ratio

ex) 80dB and 100dB are 20dB difference, but sound pressure ratio is 10 ^20/10 = 10 ² = 100. That is, 100dB is 100 times the loudness (sound pressure) compared to 80dB.

As shown in Table 2, which is a result of analyzing the dB by frequency, in the frequency band of 250 Hz or less, the dB reduction due to the detenso-type cutting wheel or the sandwich-type cutting wheel is not much, but 500 dB or more (shaded portion). Shows the dB reduction effect, and the width of the reduction is found to be in agreement with the above noise reduction effect sequence (TEST 4 → 5 → 2 → 3).

In addition, looking at the dB difference on the basis of TEST 1, as shown in Table 3, the noise reduction effect of the sandwich cutting wheel of TEST 4 is the most excellent, TEST 5 of the present invention is the next, TEST 2, 3 It was found that the noise reduction effect was in order. In other words, TEST 3 is less suitable for the shape of through groove among TEST 2 and 3 filled with silicon in the conventional through groove, and TEST 2 is 2dB on average compared to the general flat cutting wheel of TEST 1. The degree of reduction was investigated.

In addition, as can be seen from the measurement result of the equivalent noise level (LA _eq ), the noise reduction effect of TEST 5 is about 7dB lower than that of TEST 1, which is a general flat cutting wheel. 5dB lower than that. In addition, compared to the sandwich type TEST 4, it was investigated to be somewhat higher.

However, in the case of TEST 3, the dB reduction effect of the frequency band of 500 kHz or more was hardly found, and therefore, it was found that it is not suitable for the shape of the detenso groove. That is, in the case of TEST 2, as shown in (b) of FIG. 2, the detento groove is formed in the circumferential direction of the wheel body, so that the noise absorbing effect is exhibited to some extent, but in the case of TEST3, FIG. As shown in (c), the detento groove is formed in the radial direction of the wheel body, so that the noise generated by the outside and the inside of the wheel cannot be prevented from being propagated. . Therefore, the experimental results are data to prove that it is experimentally very valid to form a through groove so as to intercept all radiation from the center to the body of the cutting wheel in the present invention to block and absorb the generated noise.

In addition, noise reduction in TEST 2, 4, and 5 was shown to reduce the overall average dB by reducing dB in the high frequency band, so that the operator's perceived noise reduction effect was greater than the numerically indicated dB reduction. It became.

As such, the reason why the cutting wheel having the through groove according to the present invention exhibits an effective noise reduction effect as compared with the conventional cutting wheel with the other through groove is provided is that the cutting wheel according to the present invention has an outer diameter at the center of the through groove 18 and the wheel. This is because when the random radiation 19 is drawn to the through grooves 18, the noise blocking rate is improved, and the noise reduction effect is increased by filling the through grooves 18 with urethane, which is a sound absorbing material. This is because the groove 18 has a narrow portion 25 and a wide portion 17 to block and absorb noise more efficiently.

In other words, noise is generated by the workpiece, the diamond cutting tip 20, and the wheel body 13 by generating shock or friction noise and vibration, and the noise is formed in the recessed groove 12 formed in the wheel body 13. It is known to occur most frequently at). Therefore, the generated noise is transmitted from the outer diameter of the cutting wheel to the center of the inner diameter, or the noise transmitted to the center of the cutting wheel is reflected back to the outer diameter of the cutting wheel to generate a large noise at a specific frequency. The formed cutting wheel is made by using laser cutting to make narrow line-shaped through grooves on the wheel body part and to fill the silicon inside, but the silicon filled in the through grooves during the use is dropped or the groove is uniformly wide. Since it is a narrow line, the noise reduction effect is not so great.

Therefore, the core of the present invention is not a conventional narrow narrow through groove, but the through groove 18 composed of a wide portion 17 and a narrow portion 25 to form a wheel body 10 By filling-curing by mixing urethane, thermoplastic resin and metal powder, or urethane and thermoplastic resin with metal powder inside, it prevents the noise absorbing material from falling off during the use of cutting wheel, and straightens the outer diameter and inner diameter of the wheel body. When it is connected to the through groove 18 always meets the noise reduction effect is greatly improved to match the conventional sandwich-type cutting wheel.

As described above, the present invention crosses all the radiation from the center to the body of the cutting wheel, so that the through groove is formed into a narrow portion and a wide portion so as to block and absorb the generated noise, the existing flat plate type And the noise and vibration reduction performance is significantly improved than the cutting wheel formed with the through groove. In addition, it absorbs noise and vibration as comparable to sandwich cutting wheels with high noise reduction rate, but is significantly higher than sandwich cutting wheels in terms of strength and 1/2 to 1 compared to cutting wheels for sandwich noise reduction shanks in terms of manufacturing cost. Economical effect that can be manufactured at a low price of about / 3

Claims (12)

In a cutting wheel formed with a plurality of through grooves in the wheel body, The through groove has a variable width, the cutting wheel formed with a through groove, characterized in that the through groove is filled with a noise absorbing material. The cutting wheel as set forth in claim 1, wherein the variable width portion is formed at both ends and a central portion of the through groove. The cutting wheel according to claim 1 or 2, wherein the through groove is curved. The cutting wheel according to claim 1 or 2, wherein at least one of the through grooves is formed to intersect any radiation of the wheel body. The cutting wheel according to claim 1 or 2, wherein the through groove is formed such that one end of each of the through grooves and the adjacent through grooves are crossed by the same radiation. The cutting wheel according to claim 1 or 2, wherein the noise absorbing material is any one selected from urethane, thermosetting resin, metal powder, or a mixture of two or more thereof. The cutting wheel according to claim 6, wherein the metal powder is copper or copper alloy powder. In the manufacturing method of the cutting wheel, Forming a plurality of through grooves having a variable width; Preparing a sound absorbing material to be filled in the through grooves; And a step of filling the through groove with the noise absorbing material. The method of claim 8, further comprising applying an adhesive to the inner wall of the through groove prior to filling the sound absorbing material in the through groove. The method of claim 8, wherein the preparing of the sound absorbing material comprises mixing the urethane or the thermosetting resin and the metal powder with the curing agent in a 1: 1 ratio. The method of claim 10, wherein the step of preparing the sound absorbing material comprises a step of mixing a urethane or thermosetting resin with a curing agent 1: 1, and then mixing the metal powder 1: 1: Method of manufacturing a cutting wheel. The manufacturing method of any one of claims 8 to 11, wherein the filling of the noise absorbing material into the through grooves comprises heating at 70 to 150 ° C. for 1 to 6 hours. Way.