U-shaped cutting segment for abrasive cutting tool

Abstract

A cutting segment (110) for mounting onto a working tool to provide a grinding operation therethrough, the cutting segment (110) having first and second side walls (220, 230) extending along an intended direction of movement (M) of the cutting segment (110) during a grinding operation by the working tool, where the side walls (220, 230) are joined by a top surface (210), the cutting segment (110) has a top surface (210) arranged to engage a working object during a grinding operation, and wherein a preformed groove (130) in the top surface (210) of the cutting segment (110) extends in an intended direction of movement (M).

Description

Technical Field

[0001] The present invention relates to an abrasive cutting tool for machining hard materials such as concrete, reinforced concrete and stone. A cutting segment and a working tool including the cutting segment, as well as related construction equipment are disclosed. Background Art

[0002] It is known to utilize abrasive tools for cutting hard materials such as concrete, reinforced concrete and stone.Abrasive tools typically comprise a cutting segment arranged on the periphery of a rotatable working tool that engages the material to be cut.

[0003] There is a need for a cutting segment that makes the cutting operation more efficient. Summary of the invention

[0004] It is an object of the present disclosure to provide improved cutting segments, saw blades and other working tools for cutting hard materials such as reinforced concrete and stone.

[0005] This object is achieved at least in part by a cutting segment for mounting on a work tool to provide a grinding operation by the work tool. The cutting segment has a first and second opposite sidewall extending along the cutting segment in the direction of intended movement during the grinding operation by the work tool. The cutting segment also has a top surface arranged to engage a work object during the grinding operation, the top surface combining the two sidewalls. A groove extending in the intended direction of movement is preformed in the top surface of the cutting segment. A first end portion and a second end portion extend transversely to the sidewalls and the top surface. Thus, the cutting segment is defined by two opposite sidewalls, two opposite end portions, and a top surface opposite to the work tool.

[0006] The groove is an elongated recess formed in the top surface during the manufacture of the cutting segment. Such preformed grooves in the top surface have been shown to improve the cutting efficiency of the cutting segment. The improvement in efficiency can be at least partially due to the fact that the cutting segment now engages the work object like two parallel knives that cut into the work object, while the bottom portion of the groove effectively transports the worn material away from the incision. The depth of the preformed groove measured along the direction perpendicular to the bottom surface of the groove is at least 0.75 mm, and the depth is preferably greater than 1.0 mm at least in one position along the groove. Therefore, the preformed groove has a significant depth, exceeding the depth that can be obtained by only wearing the known sandwich material cutting segment. By preforming the groove in the top surface, the cutting efficiency can be improved when the new cutting segment starts to be used, which is an advantage. The cutting segment preferably includes diamond particles fixedly held in place by a bonding base, but other forms of abrasive materials, such as various carbides, can also be used.

[0007] The groove is preformed, which means that it already exists when the cutting segment leaves the factory and before the cutting segment is used for the first time. The preformed groove can be, for example, a machined groove, a molded groove or a pressed groove.

[0008] The preformed groove has longitudinal side walls extending in the intended direction of motion (i.e., in the same direction as the cutting segment side walls). These longitudinal side walls of the preformed groove are preferably arranged at an angle relative to the corresponding side walls of the cutting segment. Therefore, the groove preferably has a cross-sectional shape that is not a perfect rectangle, but has side walls that slope inwardly and downwardly into the groove, so that the groove is narrower at the bottom than at the top of the groove. Due to these angled walls, lateral pressure is applied to the sides of the groove during the forming of the groove by a pressing tool (such as a graphite pressing tool, which will be discussed in more detail below). The lateral pressure on the side walls increases the strength of the side walls, which is an advantage. The angle is preferably between 30 and 70 degrees, and more preferably about 56 degrees.

[0009] The width of the preformed groove is measured orthogonally to the intended direction of movement, the width preferably decreasing from between 3.3 mm and 4.3 mm (and more preferably 3.8 mm) at the top of the preformed groove to between 0.5 mm and 1.5 mm (and more preferably 1.0 mm) at the bottom of the preformed groove. The exact width of the preformed groove can of course be optimized according to the intended cutting operation and can therefore vary, but these width specifications have been found to be suitable for a variety of work tasks, such as floor sawing and wall sawing.

[0010] The ratio of the maximum width of the preformed groove to the total width of the cutting segment is between 70% and 90%, and preferably about 80%. Thus, the groove forms a substantial portion of the top surface.

[0011] The ratio of the maximum depth of the preformed groove to the maximum width of the preformed groove is between 30% and 50%, and preferably about 40%. Thus, the groove preferably has a width greater than its depth, although some applications may benefit from other width to depth relationships. Similarly, the ratio of the maximum depth of the preformed groove to the maximum width of the total cutting section is between 20% and 40%, and preferably about 30%.

[0012] Advantageously, the cutting section is formed by at least three layers extending in the general direction of the side wall (i.e. along the intended direction of movement) and extending transversely to the top surface. This means that the cutting section has a sandwich structure formed by different layers separated by planes extending in the general direction of the side wall. The side layer forming at least a portion of the side wall comprises abrasive particles having a finer particle size than one or more layers between the side layers, which is an advantage from the perspective of cutting efficiency. The abrasive particle size of the abrasive particles in the side layer preferably corresponds to a mesh of 40 / 45, while the abrasive particle size of the abrasive particles in the layer between the side layers corresponds to a mesh of 35 / 40, i.e. the particle size is slightly larger than the outer layer forming the side wall of the groove.

[0013] According to some other preferred aspects, the concentration (concentration, content) of abrasive particles included in the side layer (forming at least a portion of the side wall) is higher than that of one or more layers between the side layers. This means that there are more contact points between the diamond and the work object at the side wall portion at the top compared to the groove portion of the top surface. This feature improves cutting efficiency. The volume percentage of the abrasive particle concentration in the side layer is appropriately selected to be between 12.5% ​​and 13.5%, and preferably about 12.9%. The volume percentage of the abrasive particle concentration in one or more layers between the side layers is appropriately selected to be between 11.5% and 12.5%, and preferably 12.0%. In addition, since the side wall is more durable than the central part of the cutting segment, the groove shape is maintained during use. That is, since the bottom portion of the groove wears faster than the groove wall, even if the top surface of the cutting segment wears during use, the groove shape will remain.

[0014] According to some aspects, the maximum width of the preformed groove is smaller than the width of the cutting section by a certain amount to form top surface side portions on both sides of the preformed groove. The top surface side portions are in an arc-shaped form when viewed from the direction of the side walls, while the bottom surface of the groove is a flat surface. This means that the groove is deeper in the middle than at the ends of the groove, and the groove side walls are higher in the middle than at the ends of the groove. Therefore, the groove side walls at the ends of the cutting section will hit the work object and often experience more wear, and have higher strength due to the smaller groove wall height. The top surface side portions are similar to parallel knives that cut into the work object, as discussed above.

[0015] Saw blades and other rotatable working tools associated with the above advantages are also disclosed herein, as well as groove forming tools and production methods for making cutting segments.

[0016] Generally, unless otherwise expressly defined herein, all terms used in the claims will be interpreted according to their ordinary meanings in the technical field. Unless otherwise expressly stated, all references to "one / a kind / the element, device, part, device, step, etc." will be openly interpreted as referring to at least one instance of the element, device, part, device, step, etc. When studying the attached claims and the following description, further features and advantages of the present invention will become apparent. The technician will recognize that, without departing from the scope of the present invention, the different features of the present invention can be combined to produce embodiments other than those described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present disclosure will be described in more detail with reference to the accompanying drawings, in which:

[0018] Figure 1 An exemplary saw blade including a cutting segment is shown;

[0019] Figure 2 A cutting segment according to a first example is shown;

[0020] FIG. 3A to FIG. 3B showing views of exemplary cutting segments;

[0021] Figure 4 The geometry of the cutting segment and the sandwich structure are shown;

[0022] FIG. 5A to FIG. 5B The process of producing cutting segments is shown;

[0023] FIG. 6A to FIG. 6B An exemplary cold pressing die is shown;

[0024] 7A to 7C Various views of an exemplary groove forming tool are shown;

[0025] Figure 8 is a flow chart showing a manufacturing method; and

[0026] Figures 9 to 14 Exemplary construction equipment is shown. DETAILED DESCRIPTION

[0027] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain aspects of the invention are shown. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments and aspects set forth herein; rather, these embodiments are provided by way of example so that the present disclosure will be thorough and complete and fully convey the scope of the invention to those skilled in the art. Throughout the description, like reference numerals refer to like elements.

[0028] It should be understood that the invention is not limited to the embodiments described herein and shown in the accompanying drawings; on the contrary, the skilled person will recognize that many changes and modifications are possible within the scope of the appended claims. This applies in particular to the exemplary dimensions of the cutting segments and saw blades described below.

[0029] Figure 1 An exemplary abrasive saw blade 100 is shown. The saw blade 100 includes a plurality of abrasive cutting segments 110 arranged in a known manner along a peripheral edge of the saw blade. The saw blade is an example of a rotatable working tool and has an intended direction of motion M about an axis of rotation A.

[0030] Generally herein, dimensions are given in millimeters (mm), and weights are given in carats (cts) or grams (g). It should be appreciated that the dimensions provided in the drawings and text are purely by way of example to show how the disclosed cutting segments and saw blades may be implemented in practice.

[0031] The cutting segment 110 includes abrasive particles, such as diamond particles, which are fixedly held in place by a metal matrix. It is desirable to provide a cutting segment that improves cutting efficiency while resisting excessive tool wear, ie, a cutting segment that cuts well and is durable.

[0032] US 3,028,710 discloses a cutting segment made as a sandwich structure, wherein the outer sidewall layers of the cutting segment have a higher concentration of abrasive particles than the central portion between the sidewall layers. This means that the central portion wears faster than the sidewall portions, thereby achieving a concave cutting segment surface which has been shown to improve cutting efficiency.

[0033] ES2762970 also describes a cutting segment with a sandwich design, wherein concave wear of the cutting segment surface is promoted by using different material compositions in different layers of the cutting segment.

[0034] Due to the sandwich structure of the cutting segment according to the above-mentioned prior art, a small recess is formed in the top surface during use, which improves the cutting efficiency. This recess or groove extends in the intended direction of movement M of the cutting segment. It has been recognized that further improvement can be achieved by preforming the groove and also making it more pronounced, i.e. deeper and with more distinct groove walls.

[0035] Figure 2 A perspective view of an exemplary cutting segment 110 is shown, and FIG. 3A to FIG. 3BA side view of an exemplary cutting segment 110 is shown. Each cutting segment 110 on a work tool has opposing first and second side walls 220, 230 that extend along a direction M of intended movement of the cutting segment 110 during a grinding operation by the work tool. The side walls are generally parallel to one another. Each cutting segment also has two opposing end portions 240, 250 that extend transversely to the side surfaces and also transversely to a top surface 210 of the cutting segment. The top surface 210 connects the side walls of the cutting segment together and faces the object to be cut. In other words, the top surface 210 engages the material to be cut during a grinding operation. On a saw blade such as the work tool 100, the side walls 220, 230 of the cutting segment 110 extend in a plane of the saw blade, while the end portions 240, 250 extend in a direction orthogonal to the plane of the saw blade (i.e., along the axis of rotation A of the saw blade). The top surface 210 of the cutting segment extends along Figure 1 The saw blade on the exemplary working tool 100 in FIG. 1 extends around the perimeter.

[0036] The cutting segment 110 typically includes diamond particles that are fixedly held in place by a bonding matrix. However, other abrasive materials, such as carbide particles, may also be used.

[0037] The groove 130 is preformed in the top surface 210 of the cutting segment 110, wherein the groove extends in the expected direction of motion M. The preformed groove is an elongated recess formed in the top surface. The preformed groove 130 is different from the shape of the concave top surface produced by the wear of the cutting segment described in US3,028,710 and ES2762970, and the groove-like shape of these concave top surfaces is not preformed, but is produced by using tools. By preforming the groove in the top surface, the cutting efficiency can be improved when the new cutting segment starts to be used, which is an advantage. In addition, the preformed groove can be formed to have an arbitrarily large depth D, and has an optimized shape and overall geometry of the groove. The preformed groove 130 can be formed by different technologies, such as a groove formed by milling or machining, a molded groove formed by a molded cutting segment, or a pressed groove formed by cold pressing or hot pressing technology.

[0038] like Figure 3A and Figure 3B As shown in , the depth D of the groove 130 is measured along a direction normal to the bottom surface 330 of the groove 130, and the depth can be at least 0.75 mm, and the depth is preferably greater than 1.0 mm at least in one position along the groove 130. Figure 3A and Figure 3B In the exemplary cutting section shown in FIG. 1 , the depth of the groove 130 at the midpoint P of the cutting section is about 1.5 mm, which has been found to be a depth that is suitable for Figure 3A and Figure 3BA suitable depth for the groove 130 of the cutting segment of the dimensions shown in FIG.

[0039] It should be noted that the top surface 210 has a radius R330, which is preferably selected to be similar to the radius of the working tool, i.e., to follow the perimeter of the saw blade 100, while the bottom surface of the groove 330 is flat, which means that the groove depth is greater at the midpoint M than at the end point E of the groove 130. This radius is optional and is preferably not used when the cutting segment is used for a coring drill bit or other type of working tool that does not have a saw blade shape. In the example, the groove depth at the end point E of the groove 130 is about 0.89 mm. The effect of this depth variation of the groove is that the groove wall, which has a smaller depth at the end point E, is stronger than at the midpoint M. Because the end point sometimes hits the object to be cut, the mechanical stress is generally greater at the end point E than at the midpoint.

[0040] The preformed groove 130 preferably has longitudinal side walls 310, 320 extending in the intended direction of movement M, which are arranged at an angle a relative to the corresponding side walls 220, 230 of the cutting segment 110, such as Figure 4 The angle a has Figure 5A and Figure 5B If the pre-formed groove 130 is formed by pressing the groove forming tool 510 into the cutting section 110 to generate a force F1 (such as Figure 5A 520 in the figure), the cut segment material is also squeezed laterally outward toward the sidewalls of tool 530 by force F2. This means that the sidewalls of the groove become stronger due to angle a and are therefore better able to resist wear during the grinding operation. Angle a can be configured between 30 degrees and 70 degrees, and is preferably about 56 degrees.

[0041] It has been found that the geometry of the grooves can affect the cutting performance of the tool 100. The grooves 130 are essentially formed into two narrow cutting portions 370, 380 like a knife, which cut into the work object more easily than if the entire top surface of the cutting section were flat. The top surface side portions 370, 380 are preferably formed to have a small width, but the width cannot be so small that the groove walls lose mechanical integrity. The width W of the groove at the bottom surface 330 and the top, as well as the depth D of the groove and the overall width W' of the cutting section 110 are the parameters of interest.

[0042] One exemplary geometry that has been found to give good results in terms of cutting efficiency and cutting segment wear is a cutting segment 110 in which the width W of the pre-formed groove 130, measured orthogonally to the intended direction of motion M, decreases from between 3.3 mm and 4.3 mm (and preferably 3.8 mm) at the top of the pre-formed groove 130 to between 0.5 mm and 1.5 mm (and preferably 1.0 mm) at the bottom of the pre-formed groove 130.

[0043] The dimensions of the example in the drawings have an upper groove width of 3.8 mm and a total cutting section width of 4.8 mm, i.e. the width of the side portions is 0.5 mm each. Generally, the ratio of the maximum width W of the preformed groove 130 to the width W' of the cutting section 110 is between 70% and 90%, and preferably about 80%, as in the example shown in the drawings.

[0044] In the example, the depth of the groove at the deepest point (around the midpoint M of the groove) is 1.5 mm, and the maximum width W of the preformed groove 130 (at the top of the groove) is about 3.8 mm. Generally, the ratio of the maximum depth D of the preformed groove 130 to the maximum width W of the preformed groove 130 is between 30% and 50%, and preferably about 40%. The ratio of the maximum depth D of the preformed groove 130 to the maximum width W of the preformed groove 130 is between 20% and 40%, and preferably about 30%.

[0045] Figure 4 An exemplary cutting segment 110 having a layered structure, which is often referred to as a sandwich structure, is shown. The cutting segment is formed of three layers 340, 350, 360 extending in the direction of the sidewalls 220, 230 (i.e., along the expected direction of motion M and transverse to the top surface 210). The side layers 340, 350 forming the sidewalls 220, 230 of the cutting segment 110 preferably include abrasive particles of a finer particle size than one or more layers 360 between the side layers 340, 350. The abrasive particle composition in these layers can be optimized to improve the cutting efficiency and wear resistance characteristics of the cutting segment 110.

[0046] Various metrics can be used to define diamond grit. The mesh number of the diamond particles in the abrasive cutting segment refers to the average number of openings in a standard size screen. The larger the number of openings, the smaller the opening. A mesh number of 40 / 45 corresponds to a particle size of about 413 microns. A mesh number of 35 / 40 corresponds to a particle size of about 456 microns, where the micron measurement can be the size of a bounding box that can surround most of the abrasive particles. Of course, other definitions can also be used, and these values ​​are interpreted as only a guide, not an exact specification. The abrasive particle size of the abrasive particles in the side layer can correspond to a mesh number of about 40 / 45 (about 413 microns), and the abrasive particle size of the abrasive particles in the layer 360 between the side layers 340 and 350 can correspond to a mesh number of about 35 / 40 (about 456 microns), that is, the particle size is coarser than the side layer. The finer particle size in the side layer provides more contact points between the hard abrasive particles and the work object, which is an advantage.

[0047] The abrasive grain concentration (e.g., diamond grain concentration) in an abrasive cutting segment can be defined in different ways, such as carats (cts) / cubic centimeter (cm3), gr / cm3, or the volume percentage of abrasive grains relative to the total cutting segment volume. The European Federation of Abrasive Producers (FEPA) also defines standards for abrasive grain concentration. The following table provides some illustrative relationships between different concentration units.

[0048]

[0049] The side layers 340, 350 forming the side walls 220, 230 may include a higher concentration of abrasive particles than the one or more layers 360 between the side layers 340, 350 to increase the strength of the groove walls and side portions 370, 380. The volume percentage of the abrasive particle concentration in the side layers 340, 350 is suitably selected to be between 12.5% ​​and 13.5%, and preferably about 12.9%. The volume percentage of the abrasive particle concentration in the one or more layers 360 between the side layers 340, 350 is suitably selected to be between 11.5% and 12.5%, and preferably 12.0%.

[0050] Generally, the advantages discussed herein regarding cutting efficiency can be obtained if the side layers 340 , 350 forming the sidewalls 220 , 230 include abrasive particles having a volume concentration at least 1.1 times higher (and preferably more than 1.7 times higher) than the volume concentration in other layers (e.g., the middle layer 360 ).

[0051] Generally, the side layers 340, 350 forming the side walls 220, 230 also preferably include abrasive particles having a particle size at least 5 mesh finer than the other layers.

[0052] Fig. 6A and Figure 6BAn exemplary cold pressing die is shown for forming an initial cutting segment blank prior to forming a groove 130 in the cutting segment 110 by a groove forming tool. It should be noted that the approach described herein can form cutting segments of different sizes. Some forms of working tools include smaller cutting segments, while other types of working tools have larger cutting segments. The geometry of the groove can be adapted in a simple manner relative to the overall geometry of the cutting tool, for example using actual experiments or computer simulations.

[0053] Fig. 7A and Figure 7B A groove forming tool 700 is shown which can be advantageously used to preform the groove 130 in the cut section blank obtained from the cold pressing die 600. The groove forming tool 700 can be formed of graphite or some other suitable material. The dimensions of the groove forming tool 700 are substantially equal to Figure 3A and Figure 3B Preferably, the groove forming tool comprises a wedge shape, but other shapes are also conceivable. The wedge shape has a shape complementary to the groove, i.e. optionally has a combination of Figure 4 The side at angle a is discussed.

[0054] Figure 8 is a flow chart showing a production process according to the above description for manufacturing a cutting segment 110. The method comprises: obtaining S1 a cold pressing die; filling S2 the cold pressing die with metal powder and diamond material; applying pressure S3 to form an intermediate cutting segment blank; obtaining S4 a groove forming tool 700 as discussed herein; and producing S5 a cutting segment 110 by pressing the groove forming tool 700 into an unprocessed cutting segment at high temperature.

[0055] Figures 9 to 14 Various construction equipment including work tools are shown in which the cutting section 100 may be advantageously used. Fig. 9 A cutting tool 900 having a saw blade 100 is shown. Fig.10 A coring drill rig 1000 having a coring drill bit 1010 is shown. Fig.11 A trephine with a cutting ring 1110 is shown, Fig.12 The chain saw 1200 is shown with the cutting section 110 mounted to the chain. Fig.13 and Fig.14 A wall saw 1300 and a floor saw 1400 are shown, both of which include a saw blade 100 .

Claims

1. A cutting segment (110) for mounting on a working tool (100, 1010, 1110, 1210) to provide a grinding operation by the working tool, The cutting segment (110) has first and second opposing side walls (220, 230) extending along an intended direction of movement (M) of the cutting segment (110) during the grinding operation by the working tool, in, The side walls (220, 230) are joined by a top surface (210) arranged to engage a work object during the grinding operation, and Wherein, the preformed groove (130) in the top surface (210) of the cutting segment (110) extends in the intended direction of movement (M).

2. The cutting segment (110) according to claim 1, wherein: The depth (D) of the preformed groove (130) measured along the normal direction of the bottom surface of the groove is at least 0.75 mm, and the depth is preferably greater than 1.0 mm at least in one position along the groove (130).

3. The cutting segment (110) according to claim 1 or 2, wherein: The preformed groove (130) is a machined groove, a molded groove or a pressed groove.

4. The cutting segment (110) according to any preceding claim, wherein: The preformed groove (130) has longitudinal side walls (310, 320) extending in the intended direction of movement (M), wherein the longitudinal side walls (310, 320) of the preformed groove (130) are arranged at an angle (a) relative to the corresponding side walls (220, 230) of the cutting segment (110).

5. The cutting segment (110) according to any preceding claim, wherein The angle (a) is between 30 and 70 degrees, and the angle is preferably about 56 degrees.

6. The cutting segment (110) according to any preceding claim, wherein The width (W) of the preformed groove (130) is measured orthogonally to the intended direction of movement (M), and the width decreases from the top of the preformed groove (130) to the bottom of the preformed groove (130), the width at the top of the preformed groove being between 3.3 mm and 4.3 mm and preferably about 3.8 mm, and the width at the bottom of the preformed groove being between 0.5 mm and 1.5 mm and preferably 1.0 mm.

7. The cutting segment (110) according to any preceding claim, wherein The ratio of the maximum width (W) of the pre-forming groove (130) to the width (W') of the cutting section (110) is between 70% and 90%, and preferably about 80%.

8. The cutting segment (110) according to any preceding claim, wherein The ratio of the maximum depth (D) of the pre-formed groove (130) to the maximum width (W) of the pre-formed groove (130) is between 30% and 50%, and preferably about 40%.

9. The cutting segment (110) according to any preceding claim, wherein: The ratio of the maximum depth (D) of the pre-formed groove (130) to the maximum width (W) of the cutting segment (110) is between 20% and 40%, and preferably about 30%.

10. The cutting segment (110) according to any preceding claim, comprising diamond particles fixedly held in place by a bonding matrix.

11. The cutting segment (110) according to any of the preceding claims, formed of at least three layers (340, 350, 360) extending in the direction of the side walls (220, 230) along the intended direction of movement (M) and transversely to the top surface (210), wherein The side layers (340, 350) forming the side walls (220, 230) include abrasive particles having a finer grain size than one or more layers (360) interposed between the side layers (340, 350).

12. The cutting segment (110) according to claim 11, wherein The abrasive grain size of the abrasive grains in the side layers corresponds to a 40 / 45 mesh, and wherein the abrasive grain size of the abrasive grains in the layer (350) between the side layers (340, 350) corresponds to a 35 / 40 mesh.

13. The cutting segment (110) according to any of the preceding claims, formed of at least three layers (340, 350, 360) extending in the direction of the side walls (220, 230) along the intended direction of movement (M) and transversely to the top surface (210), wherein The side layers (340, 350) forming the side walls (220, 230) include a higher concentration of abrasive particles than one or more layers (360) between the side layers (340, 350).

14. The cutting segment (110) according to claim 13, wherein: The volume percentage of the abrasive grain concentration in the side layers (340, 350) is between 12.5% ​​and 13.5%, and preferably 12.9%, and the volume percentage of the abrasive grain concentration in the layer (360) between the side layers (340, 350) is between 11.5% and 12.5%, and preferably 12.0%.

15. The cutting segment (110) according to any of the preceding claims, formed of at least three layers (340, 350, 360) extending in a direction of the side walls (220, 230) along the intended direction of movement (M) and transversely to the top surface (210), wherein The side layer (340, 350) forming the side wall (220, 230) includes a concentration of abrasive particles that is at least 1.1 times higher, and preferably more than 1.7 times higher, than the concentration of abrasive particles in one of the other layers.

16. The cutting segment (110) according to any preceding claim, formed of at least three layers (340, 350, 360) extending in the direction of the side walls (220, 230) along the intended direction of movement (M) and transversely to the top surface (210), wherein The side layer (340, 350) forming the side wall (220, 230) includes abrasive particles having a particle size that is at least 5 meshes finer than the particle size of abrasive particles in one of the other layers.

17. The cutting segment (110) according to any preceding claim, wherein The maximum width (W) of the preformed groove (130) is smaller than the width (W') of the cutting section (110) to form top surface side portions (370, 380) on both sides of the preformed groove, wherein the top surface side portions (370, 380) are in an arc form (R330) when viewed in the direction of the side walls (220, 230), while the bottom surface of the groove (330) is a flat surface.

18. A saw blade (100), a coring drill bit (1010), a ring saw (1110) or a saw chain (1210) comprising a cutting segment (110) according to any preceding claim.

19. A groove forming tool (700) arranged to form a groove (130) in a cutting segment (110) according to any one of claims 1 to 17.

20. The groove forming tool (700) of claim 19, formed of graphite.

21. The groove forming tool (700) according to claim 19 or 20, having a wedge shape.

22. A method for producing a cutting segment (110), comprising: Obtain (S1) a cold pressing mold, The cold pressing mold is filled (S2) with metal powder and diamond material, Apply pressure (S3) to form the intermediate cutting section blank, obtaining (S4) a groove forming tool (700) according to claim 19, and The cutting segment (110) is produced (S5) by pressing the groove forming tool (700) into the unprocessed cutting segment at high temperature.

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