TWI789052B - Cutter wheel (1) - Google Patents

Abstract

A cutter wheel (1) includes a plurality of cutting units formed on a circumferential periphery of a body and spaced apart from each other. A radial section of the cutting units is formed in a V-shape. A first groove is formed between any two cutting units and connected with both of the two cutting units. A diameter of the body ranges from 0.7 mm to 0.98 mm. A number of the cutting units disposed on the body ranges from 300 to 750. Hence, with the sharp cutting arrangement of the cutting units, a brittle material such as ultrathin display screen glass provided with a thickness less than 0.15 mm can be processed and cut under smaller cutting pressure to thereby avoid problems of irregular horizontal cracks, broken glass, or through cracks of the ultrathin display screen glass and improve the yield of cut products effectively.

Description

Cutting wheel(1)

The present invention relates to a cutting tool design, in particular to a cutting wheel (1).

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

In order to effectively adapt to brittle materials of different thicknesses, the conventional practice is only to adjust the cutting pressure and cutting speed of the cutting wheel to improve the yield of cutting brittle materials. However, with the development of technology, as smart phones, tablets, computers, etc. The glass of the display panel is becoming increasingly thinner. The thickness of a single layer of TFT (Thin Film Transistor) liquid crystal panel in the current market is 0.15mm~0.2mm, and the selected thickness is less than .15mm, and even the thickness is less than 0.1mm. mm ultra-thin glass trend.

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 cutting pressure and cutting speed of the cutting wheel are extremely high. It will cause problems such as irregular horizontal extension cracks of ultra-thin glass, glass fragmentation, and cross-section penetrating cracks. Therefore, the yield of ultra-thin brittle materials after cutting is not ideal and 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 brittle materials.

Thus, the cutting wheel (1) of the present invention includes a body, a plurality of cutting units formed in the outer peripheral direction of the body, and a first groove formed between any two cutting units and respectively connected to the cutting units on both sides; Wherein, a through hole is opened in the center of the body, and the radial section of the cutting unit is V-shaped, and the cutting units are sharp cutting devices, and the diameter of the body is 0.7mm~0.98mm, At the same time, the setting quantity range of the cutting unit is 300~750; thereby, the diameter range through the body is 0.7mm~0.98mm, and the setting quantity range of the cutting units is 300~750, and then any 2. The cooperative setting of the connection between the cutting units with the first groove is suitable for the cutting operation of brittle materials such as ultra-thin display screen glass with a thickness less than 0.15mm, and using these The sharp cutting function of the cutting part can match the cutting process of ultra-thin display glass under the condition of smaller cutting knife pressure, effectively and greatly slow down the irregular horizontal extension that will occur during the cutting process of ultra-thin display glass Problems such as cracks, glass breakage, and cross-section through cracks occur, effectively improving the yield of cutting products.

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

Referring to Fig. 1, Fig. 2, one of preferred embodiment of the present invention, this cutter wheel (1) 3 comprises a body 31, plural is formed with the cutting unit 32 of this body 31 outer edge circumferential direction, and one is formed on any two of this cutting Between the unit 32 and the first groove 33 connected with the cutting unit 32 on both sides respectively; wherein, the center of the body 31 offers a through hole 311, so that the through hole 311 can be used to drive the cutting wheel ( 1) 3 rotating cutter shafts (not shown in the figure) are installed, while the diameter range of the body 31 is 0.7mm~0.98mm, and the thickness range of the body 31 can be 0.35mm~0.50mm, and the through hole 311 The diameter range can be 0.35mm~0.50mm and other sizes, so as to adjust the design according to different cutting requirements or customized requirements, and the overall production material of the cutting wheel (1) 3 mainly includes gold steel stone, polycrystalline or polycrystalline diamond, etc.

Continuing from the above, the cutting unit 32 is formed by the intersection of two inclined planes, so that the radial section of the cutting unit 32 is V-shaped, and the cutting unit 32 is provided with tens to hundreds of pieces along the circumferential direction of the body 31. setting, 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 blades, and the setting number of the cutting unit 32 ranges from 300 to 750. Of course, the cutting unit 32 The preferred number of settings can be 300~450, or 400~750, that is, for example: when the diameter of the body 31 is 0.98mm, the number of the cutting unit 32 can be preferably set in the range of 300~ 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 shape of a cutting edge, and the first groove 33 in the shape of a cutting edge and the The joints of the cutting units 32 in the form of cutting teeth and cutting blades are arc-shaped, while 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 shape of the cutting part, and the number of the first groove 33 on the body 31 is the same as the number of the cutting unit 32; and in some embodiments, the shape of the first groove 33 is V-shaped or When the arc is arranged, the first groove 33 in the shape of the cutting edge is relatively V-shaped or arc-shaped, that is, for example, when the first groove 33 is in the shape 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 cut glass will be very small, so that the glass is not fragile during the cutting process, and the design with a small radius of curvature can Effectively improve the overall cutting of the cutting wheel (1) 3, while the aforementioned first groove 33 in the form of an arc cutting edge includes a first arc segment, a second arc segment and a third arc segment, the first arc segment 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 different from that of the second arc segment. The radii of curvature of the third arc section are the same or different, and the first arc section is connected to the cutting unit 32 in the form of a cutting edge and a cutting tooth at both ends of the first groove 33 in a smooth transition, Of course, the first groove 33 is not limited to include the first arc segment, the second arc segment and the third arc segment, it can also be designed to include four arcs with different radii of curvature in response to different cutting processes. Shaped segments, or more than five arc-shaped segments with different radii of curvature.

Following the above, in the embodiment, the width range of the first groove 33 can be set at 2um~7.5um, the depth range of the first groove 33 can be set at 0.6um~3um, and any two of the first grooves 33 The pitch can be set at 4um~7.9um, etc., so that the cutting wheel (1) 3 can pass through the 2um~7.5um width range of the first groove 33, and when cutting glass with a thickness of 0.1mm and 0.07mm, the The glass is not easy to break, and can also reduce the risk of glass transverse cracks and cross-sectional cracks. Of course, if the number of the first groove 33 on the body 31 is the same as that of the cutting unit 32, it 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 depth can be set at 0.5um~1.5um. For example, when the body 31 The diameter of the cutting unit 32 is 0.98mm, and the number of the cutting unit 32 on the body 31 ranges from 400 to 750. When the width of the first groove 33 is preferably in the range of 2um to 4um, the depth of the first groove 33 is relatively large. The optimal range is 0.5um~2.5um, and when the interval between the cutting units 32 is 4um~7.9um, that is, the width of the first groove 33 and the adjacent cutting unit 32 is 4um~ 7.9um, and for example, when the diameter of the body 31 is 0.98mm, the number of cutting units 32 arranged 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 when 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 unit 32 ranges from 3.9 um to 7.9 um, so the cutting wheel 3 with a diameter of 0.98 mm is suitable for cutting operations on brittle materials with a thickness of 0.05 mm to 0.15 mm, especially It is preferably used on brittle materials with a thickness of 0.05mm~0.10mm. Of course, for special cutting operations, the diameter of the main body 31 can be set to 0.7mm, and the preferred setting range of the cutting unit 32 can be 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 at 0.5um~2.5um, so that it can respond to different cutting Homework in progress.

Please refer to FIG. 4, the section A1-A1 is made through the V-shaped tip of the cutting unit 32 of the body 31, and the obtained section A1-A1 will appear as shown in FIG. 5a, and deviate from the section A1 in the axial direction. The cross section B1-B1 is made at the position of -A1, the obtained cross section B1-B1 is as shown in Figure 5b, and the cross section C1-C1 is made at the position offset from the cross section B1-B1 in the axial direction, the obtained cross section C1-C1 will be as shown in the figure As shown in 5c, as shown in Figure 5a, Figure 5b and Figure 5c disclosed above, in the section A1-A1, the section B1-B1 and the section C1-C1, a plurality of first grooves 33 are all arranged in a wave-like structure , so as shown in Figure 5a, the cutting unit 32 cuts into the brittle material at the position on the cross-section A1-A1, and as shown in Figure 5b, the cutting unit 32 contacts the brittle material at the position on the cross-section B1-B1, as shown in Figure 5c As shown, there is a gap between the cutting unit 32 on the section C1-C1 and the brittle material; therefore, the design of the present invention can be applied to ultra-thin displays with a thickness of less than 0.15 mm, or even a thickness of less than 0.1 mm. On brittle materials such as curtain glass 4, the cutting unit 32 is matched with the first groove 33 to have a sharper cutting effect, which can match the cutting of ultra-thin display curtain glass 4 under the condition of smaller cutting knife pressure process, so that the ultra-thin display screen glass 4 can withstand the increased knife pressure during the cutting process, and greatly alleviate the irregular horizontal extension cracks, glass breakage, And cross-section penetrating cracks and other issues, effectively greatly improving 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 essentials and the essentials is the same as that described in the previous embodiment. Repeatedly; especially, in this embodiment, the inner wall of each first groove 33 is provided with at least one second groove 34; The inner wall of the groove 33, the position where the first groove 33 is connected to the cutting unit 32 is the groove top, the position where the first groove 33 is closest to the center of the body 31 is the groove bottom, and the second groove 34 is opposite to the groove. The inner wall of the first groove 33 is further concave toward the center of the body 31. Of course, the position of the second groove 34 on the inner wall of the first groove 33 can be respectively set on 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 at the groove bottom closer to the first groove 33 or closer to the groove top of the first groove 33, or is located at the first groove 33. The setting at the middle position between the groove top and the groove bottom of the first groove 33, etc., is even located at the groove top of the first groove 33, and in some embodiments, the second groove 34 can be at least two. 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 two second grooves 34 can be arranged symmetrically with respect to the groove bottom of the first groove 33, Simultaneously, the width of the second groove 34 can be less than or equal to 1/4 of the width of the first groove 33 , and the depth of the second groove 34 can be less than or equal to 1/3rd 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., and the first groove 33 and the second groove 34 can be in the same shape according to different requirements, or can be The configurations are different, and the inner wall of the second slot 34 meets the inner wall of the first slot 33 in a smooth transition, and the inner wall of the first slot 33 meets the cutting unit 32 in a smooth transition.

Referring to Fig. 8, in an 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 as the cutting unit 32 in the form of the cutting edge 321. The connected cutting edge 331 is arranged in a manner, and the inner wall of the second groove 34 is formed to be arranged in a manner of cutting edge 341 connected with the first groove 33 of the cutting edge 331, so that the cutting edge 321 is in the manner of cutting edge 321. The cutting unit 32, the first groove 33 in the form of a cutting edge 331 and the second groove 34 in the form of a cutting edge 341 are connected circumferentially on the outer edge of the body 34 to form a ring-shaped cutting portion, that is, As shown in Figure 10a; therefore, a plurality of first grooves 33 connected to the cutting units 32 are provided on the outer edge of the body 31, and at least one second groove is provided on the inner wall of the first groove 33. Groove 34 is set, and benefit when this first groove 33 cuts into this glass 4, improves the sharpness that this first groove 33 cuts into glass by the existence of this second groove 34, also impels this first groove 33 to cut into glass more easily 4. Effectively overcome the poor cutting or sliding knife problems caused by the practice.

Please refer to FIG. 9 , through the V-shaped tip of the cutting unit 32 of the body 31 to make a 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 used to make section B2-B2, and the obtained section B2-B2 is shown in Figure 10b, and the section C2-C2 is made at the position offset from section B2-B2 in the axial direction, and the obtained section C2-C2 will be as shown in the figure As shown in Figure 10c, and as shown in Figure 10a, Figure 10b and Figure 10c, cross-section A2-A2, cross-section B2-B2 and cross-section C2-C2 are all wave-like structures formed by a plurality of first grooves 33, and each The setting of 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 some embodiments, the cutting unit 32 is formed by the intersection of two inclined planes, and the radial section is V-shaped. The first A groove 33 extends from one slope to another slope, and the second groove 34 also extends from one slope to another slope, so the extension length of the first groove 33 on the two slopes is the same as that of the second groove 34 on the two slopes. The extension lengths on the two slopes are consistent; like this, better cutting quality can be obtained when the first groove 33 cuts 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 bad cutting or slipping of the knife, and the combination of the first groove 33 and the second groove 34 can avoid the problem of bad cutting or slipping of the knife while ensuring the cutting quality.

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

Example implementation pattern 1:

Its setting is that the diameter of this cutter wheel (one) 3 is 0.95mm, and the thickness of this cutter wheel (one) 3 is 0.4mm, and the diameter of the through hole 311 of this cutter wheel (one) 3 is 0.4mm, set The number of the cutting units 32 in the peripheral direction of the 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 0.6um ~ 1.5um, of course, the depth of the first groove 33 is more preferably 1.0um, as shown in Figure 3, the depth of the radius RO of the body 33 is 0.475mm, the first groove 33 on both sides and The adjacent cutting units 32 are connected by a circular arc transition, and the arc radii of the circular 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 effect of the known cutting wheel (the number of cutting units is 600) with a general diameter of 1.2mm is carried out by the exemplary embodiment disclosed above—the cutting wheel (1) 3 In contrast, the cutting sharpness of the cutting wheel (1) 3 disclosed in the present invention has been improved by about 34%, and when cutting the glass 4 with a thickness of 0.07mm, there is no irregular fracture on the surface of the glass 4, and the cutting is broken simultaneously. The proportion of penetrating cracks on the surface has also decreased by 87%, which is shown in the following parameter table 1.

Table 1 knife wheel diameter/mm Angle/° Thickness/mm inner diameter/mm Number of cutting units Groove width/mm Groove depth/mm Embodiment one 0.95 110 0.4 0.4 475 3.5 1.0 Known cutting wheel 1.2 110 0.4 0.4 600 3.5 1.0

Example implementation pattern 2:

Its setting is that the diameter of this cutter wheel (one) 3 is 0.7mm, and the thickness of this cutter wheel (one) 3 is 0.4mm, and the diameter of the through hole 311 of this cutter wheel (one) 3 is 0.4mm, set The number of the cutting units 32 in the peripheral direction of the 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 Figure 3, with the depth of the radius RO of the body 31 being 0.375mm, the two sides of the first groove 33 are connected with the adjacent cutting unit 32 using a circular arc transition, and The arc radii of the 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 V-shaped arrangement; therefore, through the example implementations disclosed above Two, the cutting wheel (1) 3 is compared with the cutting effect of the known cutting wheel (the number of cutting units is 600) with a general diameter of 1.2mm, and when cutting the glass with a thickness of 0.07mm, the glass 4 There are no irregular cracks on the surface, and the proportion of penetrating cracks on the cutting section is also reduced by 72%, as shown in the following parameter table 2.

Table 2 knife wheel diameter/mm Angle/° Thickness/mm inner diameter/mm Number of cutting units Groove width/mm Groove depth/mm Embodiment two 0.7 110 0.4 0.4 350 2.8 1.0 Known cutting wheel 1.2 110 0.4 0.4 600 2.8 1.0

Example implementation pattern three:

Its setting is that the diameter of this cutter wheel (one) 3 is 0.95mm, and the thickness of this cutter wheel (one) 3 is 0.4mm, and the diameter of the through hole 311 of this cutter wheel (one) 3 is 0.4mm, set The number of the cutting units 32 in the peripheral direction of the 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 3.0um is preferred, 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 according to the third disclosed exemplary embodiment is compared with the cutting effect of a conventional cutting wheel with a diameter of 1.2 mm, and the cutting effect of the cutting wheel with a thickness of 0.05 mm When the glass 4 is cut, the cross-sectional cracks generated on the glass 4 after cutting can be greatly reduced.

To sum up the above, the cutting wheel (1) of the present invention has a plurality of cutting units connected at intervals with the first groove through the outer periphery of the main body, and the diameter range of the main body is 0.7mm~0.98mm, and the cutting units The number of settings ranges from 300 to 750, so that the sharp cutting settings of these cutting units can be used to overcome brittle materials such as ultra-thin display glass with a thickness of less than 0.15mm. Match the cutting of ultra-thin display screen glass under the condition of smaller cutting knife pressure, so as to not only ensure the cutting quality, but also avoid glass fragmentation, irregular horizontal extension cracks, and cross-sectional penetrating cracks after cutting And other things happen, effectively improve the yield of cutting products.

But the above is only to illustrate the preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, all the simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention , should still fall within the scope covered by the patent of the present invention.

(this invention)

3: Cutting knife wheel (1)

31: Ontology

32: Cutting unit

33: 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 a partial structure E in FIG. 1 . Fig. 4 is a schematic view showing the cutting wheel (1) as A1-A1 section, B1-B1 section and C1-C1 section.

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

Fig. 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 diagram of the cutting wheel (1) shown in Fig. 7 as A2-A2 section, B2-B2 section and C2-C2 section.

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

(this invention)

3: Cutting knife wheel (1)

31: Ontology

32: Cutting unit

33: first slot

311: through hole

Claims (25)

A cutting wheel (1), which includes a body, a plurality of cutting units formed in the peripheral direction of the body, and a first groove formed between any two of the cutting units and connected to the cutting units on both sides; Wherein, there is a through hole in the center of the body, the radial section of the cutting unit is V-shaped, and the cutting units are sharp cutting devices, and the diameter of the body is 0.7mm~0.98mm, the body The thickness range of the cutting unit is 0.35mm~0.50mm, and the setting quantity range of the cutting unit is 300~750. According to the cutting wheel (1) described in claim 1, the diameter of the through hole is in the range of 0.35 mm to 0.50 mm. According to the cutting wheel (1) described in Claim 1, wherein, the cutting unit can be provided as a cutting tooth or a cutting edge, and the first groove can be provided as a cutting edge. The cutting wheel (1) according to claim 3, wherein the connection between the cutting unit and the first groove is arc-shaped. According to the cutting wheel (1) described in claim 3, 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 presents. According to the cutting wheel (1) described in Claim 5, wherein the radius of curvature of the first groove is less than 0.03mm when the first groove is arranged as an arc-shaped cutting edge. According to the cutting wheel (1) described in Claim 5, wherein, when the first groove is set as an arc-shaped cutting edge, it also includes 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, and the curvature of the first arc segment The radius is different from the radius of curvature of the second arc segment, and the radius of curvature of the first arc segment is the same as or different from that of the third arc segment. The cutting wheel (1) according to claim 7, wherein, the first arc segment and the third arc segment are respectively connected with the cutting unit on both sides of the arc-shaped first groove in a smooth transition . According to the cutting wheel (1) described in claim 1, the number of the cutting units preferably ranges from 300 to 450, or from 400 to 750. According to the cutting wheel (1) described in Claim 1, wherein, the width of the first groove ranges from 2um to 7.5um. According to the cutting wheel (1) described in Claim 9, wherein, the preferred width range of the first groove is 2um~4um or 4um~7.5um. According to the cutting wheel (1) described in claim 1, the depth of the first groove is in the range of 0.6um~3um. According to the cutting wheel (1) described in claim 11, the preferred depth range of the first groove is 0.5um~1.5um. According to the cutting wheel (1) described in Claim 1, wherein, the distance between any two adjacent first grooves is 4um~7.9um. According to the cutting wheel (1) described in claim 1, at least one second groove is provided on the inner wall of the first groove. According to the cutting wheel (1) described in Claim 15, 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 be in the shape of a cutting edge. The cutting unit in the form of a blade is provided in the form of a cutting edge connected, and the inner wall of the second groove is formed in the form of a cutting edge connected with the first groove in the form of a cutting edge. According to the cutting wheel (1) of claim 16, wherein, the cutting edge, the cutting edge and the cutting edge are circumferentially connected at the outer edge of the body to form a ring-shaped cutting portion. The cutting wheel (1) according to claim 15, 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 Uniform or inconsistent in length. The cutting wheel (1) according to Claim 15, wherein at least two second grooves are provided on the inner wall of the first groove, and the two second grooves are arranged at intervals along the circumferential direction of the cutting unit. The cutting wheel (1) according to claim 15, wherein the inner wall of the first groove is provided with at least two second grooves, and the two second grooves are arranged symmetrically with respect to the groove bottom of the first groove . According to the cutting wheel (1) described in claim 15, wherein, the second groove is arranged at the groove bottom of the first groove, or the second groove is arranged between the groove bottom and the groove top of the first groove, Or the second groove is arranged on the groove top of the first groove. The cutting wheel (1) according to claim 15, wherein the width of the second groove is less than or equal to 1/4 of the width of the first groove. The cutting wheel (1) according to claim 15, 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 15, wherein the second groove is a V-shaped groove, a U-shaped groove or a rectangular groove. The cutting wheel (1) according to claim 15, wherein, the inner wall of the second groove is connected with the inner wall of the first groove (in a) smooth transition.

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