TWM623013U - Cutting wheel - Google Patents

Abstract

In the novel cutting wheel (1), the outer periphery of the cutting wheel (1) is formed with a plurality of cutting units arranged at intervals and having a V-shaped radial cross-section. The first groove connected to the cutting unit on the side, and the diameter of the body is in the range of 0.7mm~0.98mm, and the number of the cutting units is in the range of 300~750; The use of ultra-thin display glass and other brittle materials, using the sharp cutting settings of these cutting units, can match the cutting of ultra-thin display glass under the condition of smaller cutting knife pressure, greatly reducing ultra-thin Irregular horizontal extension cracks, glass breakage, and penetrating cracks occur in the cutting of chemical display glass, which effectively improves the yield of cutting products.

Description

Cutting wheel (1)

This creation is about a cutting tool design, especially a cutting wheel (1).

Check, the diameter of the cutting wheel used for cutting glass (including ordinary glass or glass used for smart phones, tablets, computers, etc. as display panels) and other brittle materials on the market is usually 1.8 mm to 3.0 mm in diameter, and the thickness of Around 0.65mm and so on.

In order to effectively adapt to brittle materials of different thicknesses, the conventional practice is to adjust the cutting pressure and cutting speed of the cutting wheel and other process parameters to improve the yield of cutting brittle materials. The glass of the display panel is getting thinner and thinner. The single-layer thickness of the current TFT (Thin Film Transistor) liquid crystal panel in the market is 0.15mm~0.2mm, and the thickness is less than .15mm or even less than 0.1mm. The trend of ultra-thin glass in mm.

However, for ultra-thin glass with a thickness of 0.15mm~0.2mm, and less than .15mm, or even less than 0.1mm, the requirements for the process parameters such as cutting pressure and cutting speed of the cutting wheel are extremely high. It will cause problems such as irregular horizontal extension cracks, glass breakage, and cross-section penetrating cracks in ultra-thin glass. Therefore, the yield of ultra-thin brittle materials after cutting is not ideal, which needs to be improved.

Therefore, the purpose of the present invention is to provide a cutting wheel (1), which can help alleviate the problem of cutting yield of ultra-thin and brittle materials.

Therefore, the novel cutting wheel (1) comprises a body, a plurality of cutting units formed on the outer periphery of the body in the circumferential direction, and a first groove formed between any two of the cutting units and connected to the cutting units on both sides respectively; Wherein, a through hole is opened in the center of the body, the radial section of the cutting unit is V-shaped, and the cutting units are a sharp cutting device, and the diameter of the body is in the range of 0.7mm~0.98mm, At the same time, the set number of the cutting units ranges from 300 to 750; therefore, the diameter of the body passing through the body ranges from 0.7 mm to 0.98 mm, and the set number of the cutting units ranges from 300 to 750. The matching arrangement of the connection with the first groove between the two cutting units is suitable for the cutting operation of brittle materials such as ultra-thin display glass with a thickness of less than 0.15mm or less than 0.10mm. The sharp cutting function of the cutting part can match the cutting process of ultra-thin display glass under the condition of smaller cutting blade pressure, effectively reducing the irregular horizontal extension that occurs in the cutting process of ultra-thin display glass. Problems such as cracks, broken glass, and cross-section through cracks occur, which effectively improves the yield of cut products.

The aforementioned and other technical contents, features and effects of the present invention will be clearly understood in the following detailed description of the preferred embodiments with reference to the drawings.

Referring to FIG. 1 and FIG. 2, a preferred embodiment of the present invention, the cutting wheel (1) 3 includes a main body 31, a plurality of cutting units 32 formed in the circumferential direction of the outer edge of the main body 31, and one formed in any two of the cutting units 32. The first grooves 33 between the units 32 and respectively connected with the cutting units 32 on the two sides; wherein, a through hole 311 is defined in the center of the main body 31, so that the through hole 311 can be used to drive the cutting wheel ( 1) 3 The rotating knife shaft (not shown in the figure) is installed, and the diameter of the main body 31 is in the range of 0.7mm~0.98mm, and the thickness of the main body 31 can be in the range of 0.35mm~0.50mm, and the through hole 311 The diameter range of the cutter wheel can be set in the size range of 0.35mm~0.50mm, so as to adjust the design according to different cutting needs or customized needs, and the overall production material of the cutting wheel (1) 3 mainly includes gold steel Stone, polycrystalline or polycrystalline diamond, etc.

Continuing the above, the cutting unit 32 is formed by the intersection of two inclined surfaces, so that the radial section of the cutting unit 32 is V-shaped, and at the same time, dozens to hundreds of cutting units 32 are provided along the circumference of the body 31 . so as to cut into glass, etc., and the shape of the cutting unit 32 can be set in the form of cutting teeth and cutting edges, and the setting number of the cutting unit 32 ranges from 300 to 750 settings. Of course, the cutting unit 32 The preferred setting number may be 300 to 450, or 400 to 750, that is, for example: when the diameter of the body 31 is 0.98mm, the preferred setting number of the cutting unit 32 may range from 300 to 750. 450 or so configurations.

As for, the first groove 33 is formed between any two of the cutting units 32, and the shape of the first groove 33 can be set in the form of a cutting edge, and the first groove 33 in the form of a cutting edge is different from the The junction of the cutting units 32 in the form of cutting teeth and cutting edges is arc-shaped, and the cutting units 32 and the first grooves 33 extend along the circumferential direction of the outer edge of the body 31 to form a ring The number of the first grooves 33 on the main body 31 is the same as the number of the cutting units 32; When arc-shaped, the first groove 33 in the form of a cutting edge is relatively V-shaped or arc-shaped, that is, for example, when the first groove 33 is in the form of an arc-shaped cutting edge, the radius of curvature is set When it is less than 0.03mm, the sharpness of the cutting wheel (1) 3 will be improved, and the lateral damage to the glass to be cut will be very small, so that the glass is not easily broken during the cutting process, and the design with a small radius of curvature can be used. Effectively improve the overall cutting of the cutting wheel (1) 3, and at the same time, the first groove 33 in the shape of the arc-shaped cutting edge includes a first arc-shaped section, a second arc-shaped section and a third arc-shaped section. Two arc segments are located between the first arc segment and the third arc segment, the curvature radius of the first arc segment is different from the curvature radius of the second arc segment, and the curvature radius of the first arc segment is the same as the curvature radius of the second arc segment. The radii of curvature of the third arc-shaped segments are the same or different, and the first arc-shaped segments are respectively connected with the cutting units 32 in the form of cutting edges and cutting teeth at both ends of the first groove 33 in a smooth transitional connection. Of course, the first groove 33 is not limited to include the first arc-shaped segment, the second arc-shaped segment and the third arc-shaped segment, it can also be designed to include four arcs with different radii of curvature according to different cutting processes segment, or more than five arc segments with different radii of curvature.

Continuing the above, in the embodiment, the width range of the first groove 33 can be set to 2um~7.5um, the depth range of the first groove 33 can be set to 0.6um~3um, and any two of the first grooves 33 can be set between The distance can be set to 4um~7.9um, so that the cutting wheel (1) 3 can pass through the width range of 2um~7.5um that the first groove 33 has, when cutting glass with a thickness of 0.1mm and 0.07um, the The glass is not easily broken, and can also reduce the risk of transverse cracks and cross-section cracks in the glass. Of course, if the number of the first grooves 33 on the main body 31 is the same as that of the cutting unit 32, the number is 300~450, or 400~ When there are 750 pieces, the preferred range of the width of the first groove 33 can be 2um~4um or 4um~7.5um, and the preferred range of the depth can be the setting of 0.5um~1.5um. For example, when the main body 31 The diameter of the cutting unit 32 is 0.98mm, the number of the cutting units 32 disposed on the main body 31 ranges from 400 to 750, the width of the first groove 33 is preferably in the range of 2um to 4um, and the depth of the first groove 33 is relatively The optimal range is 0.5um~2.5um, and when the interval range between the cutting units 32 is 4um~7.9um, that is, the range of the width of the first groove 33 and the adjacent cutting unit 32 is 4um~ 7.9um, for another example, when the diameter of the body 31 is 0.98mm, the number of the cutting units 32 provided on the body 31 ranges from 400 to 600, and the width of the first groove 33 is preferably 2um When ~7.5um, the depth of the first groove 33 is preferably in the range of 0.6um ~ 3um, and the corresponding interval between the cutting units 32 is in the range of 3.9um ~ 7.9um, that is, the first groove 33 and its The width of the adjacent cutting units 32 is in the range of 3.9um~7.9um, so the cutting wheel 3 with a diameter of 0.98mm mentioned above is suitable for cutting operations on brittle materials with a thickness of 0.05mm~0.15mm, especially It is preferably suitable for use on brittle materials with a thickness of 0.05mm~0.10mm. Of course, for special cutting operations, the diameter of the body 31 can be set to 0.7mm, and the preferred range of the number of cutting units 32 can be set to 300~750 pieces, and the preferred range of the width of the first groove 33 can be 2um~6um, and the preferred range of the depth of the first groove 33 can be set in the range of 0.5um~2.5um, so that it can be adapted to different cutting Work goes on.

Please refer to FIG. 4 , through the V-shaped tip of the cutting unit 32 of the main body 31 to make a section A1-A1, the obtained section A1-A1 will appear as shown in FIG. 5a, and deviate from the section A1 in the axial direction Make the section B1-B1 at the position of -A1, the obtained section B1-B1 is as shown in Figure 5b, and make the section C1-C1 at the position axially deviated from the section B1-B1, the obtained section C1-C1 will be as shown in the figure 5c, as shown in the previously disclosed Figures 5a, 5b and 5c, in the section AA, the section B1-B1 and the section C1-C1 are the wave-like structures formed by the plurality of first grooves 33, so As shown in FIG. 5a, the cutting unit 32 cuts into the brittle material at the section A1-A1, while as shown in FIG. 5b, the cutting unit 32 contacts the brittle material at the section B1-B1, as shown in FIG. 5c , the cutting unit 32 has a gap between the part on the section C1-C1 and the brittle material; therefore, the design of the present invention can be applied to the ultra-thin display glass with a thickness of less than 0.15mm, or even a thickness of less than 0.1mm 4 and other brittle materials, the cutting unit 32 can be matched with the first groove 33 to have a sharper cutting effect, which can match the cutting process of the ultra-thin display glass 4 under the condition of smaller cutting blade pressure. The ultra-thin display glass 4 can withstand the increased knife pressure when cutting in the cutting process, and greatly alleviates irregular horizontal extension cracks, glass breakage, and fractures that may occur in the ultra-thin display glass 4 during cutting. Surface penetration cracks and other problems, effectively improve the yield of cutting products.

Referring to FIG. 6 and FIG. 7 , another preferred embodiment of the present invention still includes the components described in the previous embodiment, and the connection relationship between the elements is the same as that described in the previous embodiment. In particular, in this embodiment, the inner wall of each first groove 33 is provided with at least one second groove 34; wherein, the wall surface of the first groove 33 concave to the center of the main body 31 is the first groove 33 The inner wall of the groove 33, the part where the first groove 33 is connected to the cutting unit 32 is the groove top, the position of the first groove 33 closest to the center of the main body 31 is the groove bottom, and the second groove 34 is opposite to the groove bottom. The inner wall of the first groove 33 is further recessed toward the center of the main body 31 . Of course, the position of the second groove 34 on the inner wall of the first groove 33 can be located in the first groove 33 according to different cutting requirements. The groove bottom of the groove 33 is located between the groove bottom and the groove top of the first groove 33, is located closer to the groove bottom of the first groove 33 or is located closer to the groove top of the first groove 33, or is located in the The first slot 33 is arranged at the middle position between the slot top and the slot bottom, or even at the slot top of the first slot 33, and in some embodiments, the second slot 34 can be at least two devices. On the inner wall of the first groove 33, the two second grooves 33 are arranged at intervals along the circumferential direction of the cutting unit 32. Of course, the second grooves 34 can be symmetrically arranged with respect to the groove bottom of the first groove 33, Meanwhile, the width of the second groove 34 can be less than or equal to one quarter of the width of the first groove 33 , and the depth of the second groove 34 can be less than or equal to one third of the depth of the first groove 33 . One, of course, the configuration of the second groove 34 can be a V-shaped groove, a U-shaped groove or a rectangular groove, etc. Furthermore, the first groove 33 and the second groove 34 can be in the same shape according to different needs, or they can be The inner wall of the second slot 34 and the inner wall of the first slot 33 are in a smooth transition connection, and the inner wall of the first slot 33 is in a smooth transition connection with the cutting unit 32 .

Referring to FIG. 8 , in the embodiment, the V-shaped tip of the cutting unit 32 can be formed in the form of a cutting edge 321 , and the inner wall of the first groove 33 is formed in the same way as the cutting unit 32 in the form of the cutting edge 321 . The connected cutting edge 331 is arranged in the form, and the inner wall of the second groove 34 is formed as the cutting edge 341 connected with the first groove 33 which is the cutting edge 331. The cutting unit 32 , the first groove 33 in the form of the cutting edge 331 and the second groove 34 in the form of the cutting edge 341 are circumferentially connected to the outer edge of the main body 34 to form a ring-shaped cutting portion. As shown in FIG. 10a; therefore, a plurality of first grooves 33 connected to the cutting units 32 are provided on the outer periphery of the main body 31, and at least one second groove 33 is provided on the inner wall of the first groove 33. The slot 34 is provided so that when the first slot 33 cuts into the glass 4, the existence of the second slot 34 improves the sharpness of the first slot 33 cutting into the glass, and also makes the first slot 33 easier to cut into the glass 4. Effectively overcome the problem of poor cutting or slippage caused by conventional knowledge.

Please refer to FIG. 9 , through the V-shaped tip of the cutting unit 32 of the main body 31 to make the section A2-A2, the obtained section A2-A2 will appear as shown in FIG. 10a, and deviate from the section A2 in the axial direction The position of -A2 is set as section B2-B2, the obtained section B2-B2 is as shown in Figure 10b, and section C2-C2 is set at the position axially deviated from section B2-B2, the obtained section C2-C2 will be as shown in Figure 10b 10c, and as shown in FIGS. 10a, 10b and 10c, the sections A2-A2, B2-B2 and C2-C2 are all wave-like structures formed by a plurality of first grooves 33, and each The second groove 34 is nested in the first groove 33 ; of course, in some embodiments, the extension length of the second groove 34 on both sides of the V-shaped tip of the cutting unit 32 is the same as that of the first groove 33 The extension lengths on both sides of the V-shaped tip of the cutting unit 32 are consistent or inconsistent. In other embodiments, the cutting unit 32 is formed by intersecting two inclined surfaces, and the radial cross section is V-shaped. A groove 33 extends from one inclined surface to another inclined surface, and the second groove 34 also extends from one inclined surface to another inclined surface, so the extension length of the first groove 33 on the two inclined surfaces is two different from that of the second groove 34 The extension lengths on the inclined planes are consistent; in this way, the first groove 33 can obtain better cutting quality when cutting the glass 4, and the second groove 34 can improve the cutting performance of the cutting wheel (1). In order to reduce the probability of poor cutting or sliding knife, and the combination of the first groove 33 and the second groove 34 can ensure the cutting quality while avoiding the problem of poor cutting or sliding knife.

Below, only three specific implementation examples of the cutting wheel (1) 3 of the present invention are given.

Example implementation form 1:

It is set that the diameter of the cutting wheel (1) 3 is 0.95mm, the thickness of the cutting wheel (1) 3 is 0.4mm, and the diameter of the through hole 311 of the cutting wheel (1) 3 is 0.4mm, set The number of the cutting units 32 in the circumferential direction of the outer edge of the main body 31 is 475, the interval between any two cutting units 32 is 6.0um, the width w of the first groove 33 is about 3.5um, and the depth d of the first groove 33 It is 0.6um～1.5um, of course the depth of this first groove 33 is preferably 1.0um, as shown in Figure 3, with the depth of the radius RO of this body 33 is 0.475mm, the two sides of this first groove 33 and The adjacent cutting units 32 are connected by arc transition, and the arc radii of the arc transition connection parts are R1 and R2 respectively, and R1 and R2 are about 8.0um, so that the bottom of the first groove 33 is approximately arc-shaped Therefore, the cutting wheel (1) 3 can achieve the cutting effect of the conventional cutting wheel (the number of cutting units is 600) with a general diameter of 1.2mm through the exemplary embodiment disclosed above. In comparison, the cutting sharpness of the cutting wheel (1) 3 disclosed by the present invention is improved by about 34%, and when cutting the glass 4 with a thickness of 0.07 mm, the surface of the glass 4 does not have irregular cracks, and at the same time the cutting is broken. The proportion of penetrating cracks also decreased by 87%, as shown in Table 1 of the following parameters.

Table 1 cutter wheel Diameter/mm angle/° Thickness/mm Inner diameter/mm Number of cutting units Slot width/mm Slot depth/mm Example 1 0.95 110 0.4 0.4 475 3.5 1.0 conventional cutting wheel 1.2 110 0.4 0.4 600 3.5 1.0

Example implementation form 2:

It is set that the diameter of the cutting wheel (1) 3 is 0.7 mm, the thickness of the cutting wheel (1) 3 is 0.4 mm, and the diameter of the through hole 311 of the cutting wheel (1) 3 is 0.4 mm. The number of the cutting units 32 in the circumferential direction of the outer edge of the main body 31 is 500, the interval between any two cutting units 32 is 6.0um, the width w of the first groove 33 is about 3.5um, and the depth d of the first groove 33 1.0um is more preferred, as shown in FIG. 3, the depth of the radius RO of the body 31 is 0.375mm, the two sides of the first groove 33 and the adjacent cutting unit 32 are connected by arc transition, and the arc The arc radii of the transition connecting part are respectively R1 and R2, and R1 and R2 are about 8.0um, so that the bottom of the first groove 33 is arranged in an arc-shaped V-shape; 2. The cutting effect of the cutting wheel (1) 3 is compared with that of a conventional cutting wheel with a diameter of 1.2 mm (the number of cutting units is 600), and when cutting glass with a thickness of 0.07 mm, the glass 4 There is no irregular fracture on the surface, and the proportion of penetrating cracks on the cut section is also reduced by 72%, as shown in Table 2 of the following parameters.

Table 2 cutter wheel Diameter/mm angle/° Thickness/mm Inner diameter/mm Number of cutting units Slot width/mm Slot depth/mm Embodiment 2 0.7 110 0.4 0.4 350 2.8 1.0 conventional cutting wheel 1.2 110 0.4 0.4 600 2.8 1.0

Example implementation aspect three:

It is set that the diameter of the cutting wheel (1) 3 is 0.95mm, the thickness of the cutting wheel (1) 3 is 0.4mm, and the diameter of the through hole 311 of the cutting wheel (1) 3 is 0.4mm, set The number of the cutting units 32 in the circumferential direction of the outer edge of the main body 31 is 300, the interval between any two cutting units 32 is 10.0um, the width w of the first groove 33 is about 7.5um, and the depth d of the first groove 33 Preferably, 3.0um is used, the inner wall of the first groove 33 is provided with two second grooves 34, and the width of each second groove 34 is 2um, and the depth of each second groove 34 is 1.0um; Therefore, the cutting effect of the cutting wheel (1) 3 of the present invention disclosed in the third exemplary embodiment disclosed above is compared with the cutting effect of the conventional cutting wheel with a general diameter of 1.2 mm. In the case of glass 4, the cross-sectional cracks generated on the glass 4 after cutting are greatly reduced.

Summarizing the foregoing, the cutting wheel (1) of the present invention has a plurality of cutting units and first grooves connected to each other at intervals on the outer periphery of the body, and the diameter passing through the body is in the range of 0.7mm~0.98mm, and the cutting units The number of settings ranges from 300 to 750, so that these cutting units have sharp cutting settings, which can be overcome when used for cutting on brittle materials such as ultra-thin display glass with a thickness of less than 0.15mm. It matches the cutting of ultra-thin display glass under the condition of smaller cutting blade pressure, which not only ensures the cutting quality, but also avoids glass shattering, irregular horizontal extension cracks, and cross-section penetrating cracks after cutting. When things happen, it can effectively improve the yield of cutting products.

However, the above descriptions are only to illustrate the preferred embodiments of the present invention, and should not limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the new model. , shall still fall within the scope of this new patent.

(this new model) 3: Cutting wheel (1) 31: Ontology 32: Cutting unit 33: The first slot 34: Second slot 311: Through hole 321: Cutting Edge 331: Cutting Edge 341: Cutting Edge 4: Glass

FIG. 1 is a schematic front view of the cutting wheel (1) according to a preferred embodiment of the present invention. FIG. 2 is a schematic side view of the cutting wheel (1) of the preferred embodiment. FIG. 3 is an enlarged schematic view of the partial structure E in FIG. 1 . Fig. 4 is a schematic diagram showing the cutting wheel (1) as A1-A1 section, B1-B1 section and C1-C1 section.

5a, 5b and 5c correspond to the schematic diagrams of the A1-A1 section, the B1-B1 section and the C1-C1 section in FIG. 4 and the brittle material, respectively.

6 is a schematic front view of the cutting wheel (1) according to another preferred embodiment of the present invention.

FIG. 7 is a schematic side view of the cutting wheel (1) of the other preferred embodiment.

FIG. 8 is an enlarged schematic view of the partial structure D in FIG. 6 .

FIG. 9 is a schematic view of the cutting wheel (1) shown in FIG. 7 with A2-A2 section, B2-B2 section and C2-C2 section.

10a, 10b and 10c correspond to the schematic diagrams of the A2-A2 section, the B2-B2 section and the C2-C2 section in FIG. 9, respectively.

(this new model)

3: Cutting wheel (1)

31: Ontology

32: Cutting unit

33: The first slot

311: Through hole

Claims (26)

A cutting wheel (1), comprising a body, a plurality of cutting units formed on the outer periphery of the body in the circumferential direction, and a first groove formed between any two of the cutting units and connected to the cutting units on two sides respectively; Wherein, a through hole is opened in the center of the body, the radial section of the cutting unit is V-shaped, and the cutting units are a sharp cutting device, and the diameter of the body is in the range of 0.7mm~0.98mm, and at the same time The set number of the cutting units ranges from 300 to 750. The cutting wheel (1) according to claim 1, wherein the thickness of the cutting wheel body ranges from 0.35mm to 0.50mm. The cutting wheel (1) according to claim 1, wherein the diameter of the through hole ranges from 0.35mm to 0.50mm. The cutting wheel (1) according to claim 1, wherein the cutting unit can be provided with cutting teeth and cutting edges, and the first groove can be provided with cutting edges. The cutting wheel (1) according to claim 4, wherein the connection between the cutting unit and the first groove is arc-shaped. The cutting wheel (1) according to claim 4, wherein when the shape of the first groove is V-shaped or arc-shaped, the shape of the first groove as a cutting edge is relatively V-shaped or arc-shaped shape presentation. The cutting wheel (1) according to claim 6, wherein the curvature radius of the first groove is less than 0.03 mm when the first groove is arranged as an arc-shaped cutting edge. The cutting wheel (1) according to claim 6, wherein when the first groove is provided with an arc-shaped cutting edge, it further comprises a first arc-shaped segment, a second arc-shaped segment and a third arc-shaped segment, the The second arc segment is located between the first arc segment and the third arc segment, the radius of curvature of the first arc segment is different from the radius of curvature of the second arc segment, and the radius of curvature of the first arc segment is The radius of curvature of the third arc segment is the same or different. The cutting wheel (1) according to claim 8, wherein the first arc-shaped section and the third arc-shaped section are respectively connected with the cutting units located on both sides of the arc-shaped first groove in a smooth transitional connection . The cutting blade wheel (1) according to claim 1, wherein the number of the cutting units preferably ranges from 300 to 450, or from 400 to 750. The cutting wheel (1) according to claim 1, wherein the width of the first groove ranges from 2um to 7.5um. The cutting wheel (1) according to claim 10, wherein the preferred width of the first groove ranges from 2um to 4um or 4um to 7.5um. The cutting wheel (1) according to claim 1, wherein the depth of the first groove ranges from 0.6um to 3um. The cutting wheel (1) according to claim 12, wherein the preferred depth range of the first groove is 0.5um~1.5um. The cutting wheel (1) according to claim 1, wherein the distance between any two adjacent first grooves is 4um~7.9um. The cutting wheel (1) according to claim 1, wherein the inner wall of the first groove is provided with at least one second groove. The cutting wheel (1) according to claim 16, wherein the V-shaped tip of the cutting unit is formed in the shape of a cutting edge, and the inner wall of the first groove is formed to connect with the cutting unit in the shape of the cutting edge The inner wall of the second groove is formed in the form of a cutting edge connected to the first groove in the form of a cutting edge. The cutting wheel (1) according to claim 17, wherein the cutting edge, the cutting edge and the cutting edge are circumferentially connected to the outer edge of the body to form a ring-shaped cutting portion. The cutting wheel (1) according to claim 16, wherein the extension length of the second groove on both sides of the V-shaped tip of the cutting unit is the same as the extension of the first groove on both sides of the V-shaped tip of the cutting unit The lengths are consistent or inconsistent. The cutting wheel (1) according to claim 16, wherein the inner wall of the first groove is provided with at least two second grooves, and the two second grooves are arranged at intervals along the circumferential direction of the cutting unit. The cutting wheel (1) according to claim 16, wherein the inner wall of the first groove is provided with at least two second grooves, and the second grooves are symmetrically arranged with respect to the groove bottom of the first groove . The cutting wheel (1) according to claim 16, wherein the second groove is provided at the bottom of the first groove, or the second groove is provided between the bottom and the top of the first groove, Or the second groove is set on the groove top of the first groove. The cutting wheel (1) according to claim 16, wherein the width of the second groove is less than or equal to a quarter of the width of the first groove. The cutting wheel (1) according to claim 16, wherein the width of the second groove is less than or equal to one third of the width of the first groove. The cutting wheel (1) according to claim 16, wherein the second groove is a V-shaped groove, a U-shaped groove or a rectangular groove. The cutting wheel (1) according to claim 16, wherein the inner wall of the second groove and the inner wall of the first groove are connected with a smooth transition.

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