Cutting blades and cutting tools

Abstract

A cutting blade (1) comprising a first surface (11) having a rotationally symmetric polygonal shape, a second surface (12) located on the opposite side of the first surface (11), an outer circumferential surface (13) located between the first surface (11) and the second surface (12), and a central axis (CL) passing through a center of the first surface (11) and a center of the second surface (12), wherein the first surface (11) comprises a first edge (111), a first corner (112), a second corner (113), a front corner surface (114) provided along the first edge, a debris discharge groove surface (115) provided along the front corner surface (114), and a restraint surface (116) provided along the front corner surface (114) and the debris discharge groove surface (115). (116), the first edge (111) comprises a first cutting edge portion (1111), a second cutting edge portion (1112), and a transition cutting edge portion (1113), the leading edge surface (114) comprises a first leading edge surface (1141) provided along the first cutting edge portion (1111), a second leading edge surface (1142) provided along the second cutting edge portion (1112), and a third leading edge surface (1143) provided along the transition cutting edge portion (1113), and the debris groove surface (115) moves away from the second surface (12) as it moves away from the leading edge surface (114), and the debris groove surface (115) is connected to the first leading edge surface (1141) and the third leading edge surface (1143) and moves away from the second leading edge surface (1142). The cutting blade has good chip control effect and is advantageous for reducing the blade size.The present invention further provides a cutting tool.

Description

Detailed Description of the Invention

[0001] [Technical field] The present invention relates to the field of cutting tools, in particular to cutting blades and cutting knives.

[0002] [Background technology] Chinese patent application CN105478873A discloses a cutting blade with asymmetric cutting edge. The blade has two opposing surfaces and four circumferential sides, and the two opposing surfaces and the four circumferential sides form four cutting edges, and each cutting edge is divided into a first part, a second part and a transition radius. Here, if the length of the first part is L1 and the length of the second part is L2, L1>L2, and the transition radius is not located at the midpoint of the cutting edge. This technical solution solves the problem of increasing the height of the shoulder that can be used for cutting of the cutting blade.

[0003] However, in this technical solution, in order to ensure the cutting performance of the blade, the blade generally can have a large front angle, and at the same time, it is necessary to have a sufficiently large restraining surface for restraint and a front angle surface for controlling the waste, and since the space between the front angle surface and the restraining surface is small and the waste space is small, the blade is generally large, the raw material consumption is large, and the cost is high. In addition, if the size of the blade is reduced by increasing the distance between the cutting edge and the restraining surface, problems such as a decrease in the strength of the blade and difficulty in molding are likely to occur.

[0004] Summary of the Invention SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a cutting blade which has good cutting and debris disposal effects and is advantageous for reducing the blade size.

[0005] Another object of the present invention is to provide a cutting tool having the above cutting blade.

[0006] In order to solve the above technical problems, the present invention employs the following technical solutions.

[0007] In one aspect of the present invention, there is provided a cutting blade having a first surface, a second surface, an outer circumferential surface, and a central axis; the first surface presents a rotationally symmetric polygonal shape; a second surface opposite the first surface; an outer circumferential surface is located between the first surface and the second surface; a central axis passing through a center of the first surface and a center of the second surface; the first surface includes a first edge, a first corner, a second corner, a leading edge surface, a debris groove surface, and a restraining surface; a first corner connected to the first edge; a second corner connected to the first edge; The front corner surface is provided along the first edge and approaches the second surface as it moves away from the first edge, a debris groove surface is provided along the front corner surface, and the debris groove surface is spaced apart from the second surface as it moves away from the front corner surface; The restraining surface is provided along the front corner surface and the debris groove surface, is closer to the second surface than the first edge, and is perpendicular to the central axis. and , The first edge includes a first cutting edge, a second cutting edge, and a transition cutting edge. 、 a first blade portion extending from the first corner to the second corner and approaching the second surface as it approaches the second corner; a second blade portion extending linearly from the second corner to the first corner and approaching the second surface as it approaches the first corner; a transition edge connected to the first edge and the second edge and approaching the second surface as it approaches the first corner; When the outer circumferential surface is viewed from the front, the inclination angle of the transition blade portion is larger than the inclination angle of the second blade portion, The front corner surface includes a first front corner surface, a second front corner surface, and a third front corner surface, The first front corner surface is provided along the first blade portion, The second front corner surface is provided along the second blade portion, The third front corner surface is provided along the transition edge portion, The debris groove surface is connected to the first front corner surface and the third front corner surface and is spaced from the second front corner surface. 、 The restraining surface is connected to the second front corner surface.

[0008] In some embodiments, the debris channel surface is closer to the second surface than the retention surface.

[0009] In some embodiments, the debris channel surface has a first end closest to the first corner and a second end closest to the second corner, the first end being tangent to the first front corner surface and the second end being tangent to the third front corner surface, the debris channel surface having a most recessed portion closest to the second surface relative to the restraining surface, the most recessed portion being located between the first end and the second end.

[0010] In some embodiments, in a direction extending along the first edge, the most recessed point is closer to the first corner than the connection point between the first edge and the transition edge.

[0011] In some embodiments, when viewed from a direction viewing the constraint surface directly, the projection length of the distance from the first end to the second end in the direction extending along the first edge is L1, and the projection length of the distance from the first end to the most recessed point in the direction extending along the first edge is L2, where L2 / L1=1 / 2 to 2 / 3.

[0012] In some embodiments, an angle between the debris groove surface and a plane in which the restraining surface lies is α, the recess has a first position from the first end to the most recessed position and a second position closer to the most recessed position, and the angle α at the first position is less than the angle α at the second position.

[0013] In some embodiments, the range of variation of the angle α at different positions between the first end and the second end is 0°<α<40°.

[0014] In some embodiments, the front corner further comprises an extension surface connected between the first front corner surface and the debris groove surface, and in a direction toward the central axis, the extension surface approaches the second surface as it moves away from the first front corner surface.

[0015] In some embodiments, the angle between the extension surface and the plane in which the constraint surface lies is β, and the range of variation of angle β at different positions in the direction in which the extension surface extends along the first edge is 0°<β<35°.

[0016] In some embodiments, a projected length of the debris groove surface in a direction extending along the first edge is 1 / 7 to 1 / 3 of a side length of the first surface.

[0017] In some embodiments, the length of the first blade is greater than the length of the second blade.

[0018] Another aspect of the present invention provides a cutting tool including a shank and a cutting blade as described above attached to the shank.

[0019] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects. In the cutting blade of the present invention, each cutting edge on the first edge adopts an inclined extending configuration, which increases the extension length of the cutting edge and ensures the processing performance of the blade. The restraining surface is recessed toward the second surface more than the cutting edge on the first surface, so that a large chip discharge space can be provided between the restraining surface and the cutting edge, and at the same time, the first front corner surface can be ensured to have a sufficient width and angle, which ensures the cutting performance of the blade and is convenient for guiding the discharge of chips. The chip discharge groove surface can shield the chips generated along the first front corner surface, roll up the chips, and discharge them out of the blade along the chip discharge groove surface, which can avoid the chips from being rubbed against the non-cutting second cutting edge on the same first edge, and can play a good protective role on the cutting edge. The chip discharge groove surface guides the chips, making it easier to discharge the chips, saving the chip discharge space of the cutting blade, and reducing the overall shape of the cutting blade while ensuring the same cutting edge shape, which is advantageous for reducing the overall dimensions of the cutting blade, reducing the amount of raw material used for the blade, and reducing costs.

[0020] BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an embodiment of a cutting blade of the present invention. FIG. 2 is a schematic diagram of a stereoscopic view of an embodiment of a cutting blade of the present invention. FIG. 3 is a schematic view of the outer circumferential surface of the cutting blade of FIG. 2. FIG. 4 is a top view of FIG. 5 is an enlarged view of a portion A in FIG. 6 is a cross-sectional view taken along line G-G of FIG. 5. 7 is a cross-sectional view taken along the line HH in FIG. 5. 8 is a cross-sectional view taken along the line J-J in FIG. 5.

[0021] [Explanation of symbols] 1, cutting blade; 2, shank; 3, fastener; 11, first surface, 111, first edge, 1111, first blade portion, P, connection point, 1112, second blade portion, 1113, transition blade portion, 112, first corner, 1121, first corner blade portion, 113, second corner, 1131, second corner blade portion, 114, front corner surface, 1141, first front corner surface, 1142, second front corner surface, 1143, third front corner surface, 1145, extension surface, 115, debris discharge groove surface, 1151, first end, 1152, second end, 1153, most recessed portion, 116, restraint surface, 118, groove, 12, second surface, 13, outer peripheral surface, 14, central hole, CL, central axis.

[0022] [Mode for carrying out the invention] Exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It should be understood that the present invention can have various modifications in different embodiments without departing from the scope of the present invention, and the description and illustrations are used for illustrative purposes only, rather than for limiting the present invention.

[0023] Referring to FIG. 1, one embodiment of the present invention provides a cutting tool comprising a shank 2 and a cutting blade 1 attached to the shank 2 via a fastener 3.

[0024] In this embodiment, the shank 2 has a face milling machine structure. A plurality of cutting blades 1 are attached along the circumferential direction of the shank 2, and machine a workpiece as the shank 2 rotates.

[0025] The specific structure of the shank 2 and the combined structure of the cutting blade 1 and the shank 2 can be flexibly set according to the actual situation, and are not limited here.

[0026] The specific configuration of the cutting blade 1 will be described in detail below with reference to the drawings.

[0027] 2 to 8, the cutting blade 1 of this embodiment is a blade that can be used in a displaceable manner. Particularly, in this embodiment, the cutting blade 1 can be used on both sides.

[0028] The cutting blade 1 has a first surface 11, a second surface 12 located opposite the first surface 11, and an outer peripheral surface 13 located between the first surface 11 and the second surface 12. The cutting blade 1 further has a central hole 14 penetrating the first surface 11 and the second surface 12, and a fastener 3 passes through the central hole 14 to attach the cutting blade 1 to the shank 2 (as shown in FIG. 1). The first surface 11 and the second surface 12 each have a rotationally symmetric polygonal shape, and the first surface 11 and the second surface 12 each have a centrosymmetric shape, with the center of the first surface 11 and the center of the second surface 12 both located on the central axis CL of the central hole 14. The cutting blade 1 as a whole is rotationally symmetric about the central axis CL.

[0029] Referring to FIG. 2 , the first surface 11 includes a first edge 111, a first corner 112 connected to one end of the first edge 111, a second corner 113 connected to the other end of the first edge 111, a front corner surface 114 provided along the first edge 111, a debris groove surface 115 provided along the front corner surface 114, and a restraint surface 116 provided along the front corner surface 114 and the debris groove surface 115.

[0030] Here, the first edge 111, the first corner 112 and the second corner 113 are located on the outer edge of the first surface 11 and are used to form the cutting edge of the cutting blade 1. The restraining surface 116 forms a restraint with the shank 2 to maintain the fastening of the cutting blade 1 to the shank 2. The restraining surface 116 is provided around the central hole 14 and is perpendicular to the central axis CL, and the restraining surface 116 is closer to the second surface 12 than the first edge 111, that is, the restraining surface 116 is recessed into the second surface 12 more than the cutting edge of the first surface 11, so that a larger chip space can be provided between the restraining surface 116 and the cutting edge. A front corner surface 114 and a chip groove surface 115 are connected between the first edge 111 and the restraining surface 116.

[0031] 4, the projection of the first surface 11 has a substantially square shape, transitioning at the four corners of the square with circular arcs. Here, the length of the side of the square is defined as L0, and this side length L0 is obtained by projection measurement. The outer edge of the first surface 11 has four first edges 111 each extending in the longitudinal direction of the side of the square. The distance between two opposing first edges 111 is the side length L0 of the first surface 11.

[0032] The first corner 112 and the second corner 113 are each connected between two adjacent first edges 111. The first corner 112 and the second corner 113 are actually the same structure, and are merely artificially distinguished in name for ease of expression. Specifically, referring to the drawing direction of FIG. 4, for one specific first edge 111, the first corner 112 is located in the clockwise direction of the first edge 111, and the second corner 113 is located in the counterclockwise direction of the first edge 111. In this embodiment, both the first corner 112 and the second corner 113 are in the shape of a circular arc, and both ends of the circular arc are respectively connected to two adjacent first edges 111. In another embodiment, the first corner 112 and the second corner 113 may be straight and connected to two adjacent first corners 111 at an angle, respectively, forming an inclined angle transition at the four corners of the square onto which the first surface 11 is projected.

[0033] The first corner 112 is provided with a first corner blade portion 1121, and the second corner 113 is provided with a second corner blade portion 1131. In a direction from the first corner 112 or the second corner 113 toward the central axis CL, the first corner 112 or the second corner 113 can be connected to the restraint surface 116 via a stepped flat or curved surface, and these flat or curved surfaces define the front corners of the first corner blade portion 1121 or the second corner blade portion 1131.

[0034] 2 and 3, the first edge 111 includes a first blade portion 1111, a second blade portion 1112, and a transition blade portion 1113 connected between the first blade portion 1111 and the second blade portion 1112.

[0035] The first blade portion 1111 extends from the first corner 112 to the second corner 113, and approaches the second surface 12 as it approaches the second corner 113. The first blade portion 1111 may extend linearly as a whole, may extend linearly in multiple steps, or may extend in a shape that combines straight lines and curves, and the specific extension shape can be designed according to actual needs.

[0036] One end of the first blade 1111 smoothly transitions to and meets the first corner 112, and the other end smoothly transitions to and meets the transition blade 1113, where the connection point between the first blade 1111 and the transition blade 1113 is shown as P. In this embodiment, the first blade 1111 has a large extension length, and the connection point P is biased to the second corner 113, i.e., the distance between the connection point P and the second corner 113 is smaller than the distance between the connection point P and the first corner 112.

[0037] The second blade portion 1112 extends from the second corner 113 to the first corner 112, and approaches the second surface 12 as it approaches the first corner 112. The second blade portion 1112 extends linearly, and both ends of the second blade portion 1112 smoothly transition and contact the second corner 113 and the transition blade portion 1113, respectively. The length of the second blade portion 1112 is shorter than the length of the first blade portion 1111. As shown in FIG. 3, the angle between the second blade portion 1112 and a plane S perpendicular to the central axis CL is defined as the inclination angle θ2 of the second blade portion 1112.

[0038] The transition edge 1113 extends linearly between the first edge 1111 and the second edge 1112, approaching the second surface 12 as it approaches the first corner 112. As shown in FIG. 3, the angle between the transition edge 1113 and a plane S perpendicular to the central axis CL is defined as an inclination angle θ3 of the transition edge 1113. The inclination angle θ3 of the transition edge 1113 is greater than the inclination angle θ2 of the second edge 1112.

[0039] In use, the cutting blade 1 combines the first cutting edge 1111 on one first edge 111, the second cutting edge 1112 on the adjacent first edge 111, the transition cutting edge 1113, and the first corner cutting edge 1121 or the second corner cutting edge 1131 connected between these two first edges 111 to machine a right angle surface of the workpiece. Here, the first cutting edge 1111 generally serves as a main cutting edge to machine the side end surface of the workpiece, and the combination of the second cutting edge 1112 and the transition cutting edge 1113 serves as a minor cutting edge or a light-correcting edge to machine the bottom surface of the workpiece. In this embodiment, the first cutting edge 1111 has a large extension length, so that the machining efficiency can be guaranteed. The design is a two-stage structure formed by combining the second cutting edge 1112 and the transition cutting edge 1113, and adopts different inclination angles, so that the minor cutting edge can have an appropriate length and its machining performance can be guaranteed even when the blade size is limited.

[0040] 2, the front corner surface 114 extends from the first edge 111 toward the center hole 14 by a certain width, and approaches the second surface 12 as it moves away from the first edge 111. By providing the front corner surface 114 with such an inclined extension, the width and angle of the front corner surface 114 are guaranteed, and the strength, sharpness, and chip discharge performance of the cutting edge are guaranteed, and further the cutting performance of the cutting blade 1 is guaranteed.

[0041] Specifically, referring to FIG. 4, the front corner surface 114 includes a first front corner surface 1141 provided along the first blade portion 1111, a second front corner surface 1142 provided along the second blade portion 1112, and a third front corner surface 1143 provided along the transition blade portion 1113. The first front corner surface 1141 defines the front corner of the first blade portion 1111, the second front corner surface 1142 defines the front corner of the second blade portion 1112, and the third front corner surface 1143 defines the front corner of the transition blade portion 1113. The specific inclination angles and extension shapes of the first front corner surface 1141, the second front corner surface 1142, and the third front corner surface 1143 can be designed according to actual needs.

[0042] 2 and 4, the debris discharge groove surface 115 extends from the front corner surface 114 toward the central hole 14, and as it moves away from the front corner surface 114, it moves away from the second surface 12. The debris discharge groove surface 115 is connected to the first front corner surface 1141 and the third front corner surface 1143, and is away from the second front corner surface 1142. In the direction extending along the first edge 111, the debris discharge surface 115 is in contact with a portion of the first front corner surface 1141 and in contact with a portion of the third front corner surface 1143, but is not in contact with the second front corner surface 1142.

[0043] This chip discharge groove surface 115 is located between the first edge 111 and the restraining surface 116, and can easily guarantee the angle and width of the front corner surface 114, thereby ensuring the cutting performance of the cutting blade 1. At the same time, after the chips generated by the cutting of the first cutting edge portion 1111 are generated along the first front corner surface 1141 and contact the chip discharge groove surface 115, due to the inclined installation of the chip discharge groove surface 115, the chips are blocked by the chip discharge groove surface 115 and rolled up, and then discharged along the chip discharge groove surface 115 in a direction away from the first surface 11, that is, outside the cutting blade 1, thereby preventing the chips from being rubbed against the second cutting edge portion 1112 on the same first edge 111 that is not cutting, and exerting a good protective effect on the cutting edge. The guidance of the chips by this chip discharge groove surface 115 makes it easier to discharge the chips, saves the chip discharge space of the cutting blade 1, and while ensuring a similar cutting edge shape, the overall shape of the cutting blade 1 can be reduced, which is favorable for reducing the overall dimensions of the cutting blade 1, reduces the amount of blade raw material used, and reduces costs.

[0044] Preferably, the debris groove surface 115 is generally closer to the second surface 12 than the restraint surface 116, thus providing a larger chip-handling space between the debris groove surface 115 and the first blade portion 1111, making chip rolling and evacuation easier.

[0045] Referring to FIG. 5 , in this embodiment, the front corner surface 114 further includes an extension surface 1145, and the debris groove surface 115 is in contact with the extension surface 1145 to connect the first front corner surface 1141 and the third front corner surface 1143.

[0046] Here, the extension surface 1145 extends from the first front corner surface 1141 toward the central hole 14, and approaches the second surface 12 as it moves away from the first front corner surface 1141 in the direction toward the central axis CL. In the direction extending along the first edge 111, the extension surface 1145 is in contact with a portion of the first front corner surface 1141 and in contact with a portion of the third front corner surface 1143, but is not in contact with the second front corner surface 1142.

[0047] In this embodiment, the debris groove surface 115 has a first end 1151 closest to the first corner 112 and a second end 1152 closest to the second corner 113. The first end 1151 and the second end 1152 define a boundary of the debris groove surface 115 in a direction extending along the first edge 111, with the first end 1151 bordering the first front corner surface 1141 via the extension surface 1145 and the second end 1152 bordering the third front corner surface 1143 via the extension surface 1145.

[0048] The projected length of the distance between the first end 1151 and the second end 1152 in the direction extending along the first edge 111 is L1, i.e., the projected length of the debris groove surface 115 in the direction extending along the first edge 111 is L1.

[0049] In some preferred embodiments, L1 is 1 / 7 to 1 / 3 of the side length L0 of the first surface 11, i.e., L1 / L0=1 / 7 to 1 / 3. In this design range, the chip disposal groove surface 115 has a sufficient length to achieve the expected chip and chip disposal effect, while the chip disposal groove surface 115 does not occupy a large area of ​​the first surface 11, and the restraint surface 116 has a sufficient area to ensure the locking effect of the cutting blade 1 on the shank 2, and the chip disposal effect and the restraint locking effect can be balanced overall.

[0050] 5 to 8, the debris groove surface 115 is surrounded by an extension surface 1145 and forms a groove 118 recessed into the second surface 12 below the restraining surface 116.

[0051] 6 to 8, the debris groove surface 115 smoothly transitions to and contacts the extension surface 1145 at the bottom of the groove 118. When viewed in the up-down direction in the drawing direction of FIGS. 6 to 8, as viewed in the direction from the first edge 111 toward the central axis CL, the debris groove surface 115 forms an upwardly inclined portion of the groove 118, and the extension surface 1145 forms a downwardly inclined portion of the groove 118.

[0052] 6 to 8, the angle α between different positions of the debris groove surface 115 and the plane on which the restraining surface 116 is located is not completely the same, and in FIGS. 6 to 8, the angle α is distinguished and shown as α1, α2, and α3, respectively. In the direction from the first end 1151 to the second end 1152, the inclination angle of the debris groove surface 115 with respect to the restraining surface 116 changes gradually, and the specific curved surface shape can be flexibly designed, but generally, the closer to the first end 1151 or the second end 1152, the smaller the angle α between the debris groove surface 115 and the plane on which the restraining surface 116 is located. In the three cross sections shown in FIGS. 6 to 8, the angle α1<angle α2, and the angle α3<angle α2.

[0053] Preferably, at different positions between the first end 1151 and the second end 1152, the variation range of the angle α is 0°<α<40°.

[0054] Similarly, the angles β between different positions of the extension surface 1145 and the plane on which the restraint surface 116 is located are not exactly the same, and in Figs. 6 to 8, the angles β are distinguished and shown as β1, β2, and β3, respectively. In the extension direction along the first edge 111, the inclination angle of the extension surface 1145 with respect to the restraint surface 116 changes gradually, and here, the side of the extension surface 1145 close to the first edge 111 is in contact with the first front corner surface 1141 and the third front corner surface 1143, and the extension surface 1145 is further connected to the first front corner surface 1141 and the third front corner surface 1143 by transitioning with an appropriate angle and shape. The specific curved shape of the extension surface 1145 can be reasonably designed according to the actual situation.

[0055] Preferably, at different positions in the extending direction along the first edge 111 of the extending surface 1145, the variation range of the angle β is 0°<β<35°.

[0056] 6 to 8, the bottom of groove 118 formed by the intersection of debris groove surface 115 and extension surface 1145 is a curved surface that does not have the same depth relative to restraint surface 116. Here, as shown in FIG. 5, the bottom of groove 118 has the deepest point relative to restraint surface 116, that is, the deepest recess 1153 closest to second surface 12.

[0057] This most recessed point 1153, i.e., the position where the debris groove surface 115 is closest to the second surface 12 with respect to the restraining surface 116, is between the first end 1151 and the second end 1152. From the first end 1151 to the most recessed point 1153, there is a first position and a second position closer to the most recessed point 1153, and the angle α between the debris groove surface 115 and the plane on which the restraining surface 116 is located at the first position is smaller than the corresponding angle α at the second position. In some embodiments, the angle α between the debris groove surface 115 and the plane on which the restraining surface 116 is located can be designed to gradually increase in the direction from the first end 1151 to the most recessed point 1153.

[0058] Preferably, the most recessed portion 1153 is closer to the first corner 112 than the connection point P between the first blade portion 1111 and the transition blade portion 1113 in the direction extending along the first edge 111. The first blade portion 1111 is provided at an incline, and the closer it is to the transition blade portion 1113, the closer it is to the second surface 12. The groove 118 formed by the correspondingly arranged debris discharge groove surface 115 and the extension surface 1145 can increase the debris discharge space of this portion of the first blade portion 1111, and at the same time, since the most recessed portion 1153 is closer to the first corner 112 than the connection point P, at the position of the corresponding connection point P, the debris discharge groove surface 115 forms an upward slope with respect to the most recessed portion 1153, which is advantageous for the discharge of chips and ensures the debris discharge effect, and also reduces the area occupied by the debris discharge groove surface 115 on the first surface 11, and better ensures the area of ​​the restraining surface 116 to enhance the restraining effect.

[0059] In some embodiments, the projection length of the distance from the first end 1151 to the deepest recess 1153 in the extension direction along the first edge 111 is L2, and preferably, this projection length is 1 / 2 to 2 / 3 of the total projection length L1 of the debris groove surface 115, i.e., L2 / L1=1 / 2-2 / 3.

[0060] The first surface 11 has been described above in detail, but in the double-sided cutting blade 1 of this embodiment, the second surface 12 has the same structure as the first surface 11, and the two are rotationally symmetrical and can be replaced by inversion. Here, the second surface 12 will not be described in detail. When the cutting blade 1 is attached to the shank 2, the first surface 11 or the second surface 12 can be selectively involved in cutting by adjusting the attachment method.

[0061] Referring to FIG. 2 , the outer peripheral surface 13 is connected between the first surface 11 and the second surface 12, is surrounded by a number of sides parallel to the central axis CL, and can include flat and arcuate surfaces to appropriately connect to the first surface 11 and the second surface 12 depending on the extension shape of the outer edges of the first surface 11 and the second surface 12.

[0062] Although the present invention has been described with reference to some exemplary embodiments, it should be understood that the terms used are illustrative and not limiting. Since the present invention can be specifically embodied in various forms without departing from the spirit or substance of the invention, the above-described embodiments should not be limited to the details described above, but should be broadly interpreted within the spirit and scope defined in the appended claims, and all changes and modifications that fall within the scope of the claims or their equivalents should be covered by the appended claims. [Brief description of the drawings]

[0063] [Figure 1] 1 is a schematic diagram of an embodiment of a cutting blade of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of a stereoscopic view of an embodiment of a cutting blade of the present invention. [Diagram 3] 3 is a schematic view of the cutting blade of FIG. 2 as viewed from its outer circumferential surface. [Figure 4] FIG. 4 is a top view of FIG. [Diagram 5] FIG. 5 is an enlarged view of a portion A in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line G-G of FIG. 5. [Figure 7]6 is a cross-sectional view taken along the line H-H in FIG. 5. [Figure 8] FIG. 6 is a cross-sectional view taken along the line J-J in FIG. 5 .

Claims

1. A cutting blade comprising a first surface having a rotationally symmetric polygonal shape, a second surface located opposite to the first surface, an outer circumferential surface located between the first surface and the second surface, and a central axis passing through a center of the first surface and a center of the second surface, the first surface includes a first edge, a first corner, a second corner, a leading edge surface, a debris groove surface, and a restraining surface; the first corner is connected to the first edge; the second corner is connected to the first edge; The front corner surface is provided along the first edge and approaches the second surface as it moves away from the first edge, The debris groove surface is provided along the front corner surface, and is spaced apart from the second surface as it moves away from the front corner surface, the restraining surface is provided along the front corner surface and the debris groove surface, is closer to the second surface than the first edge, and is perpendicular to the central axis; the first edge includes a first cutting edge, a second cutting edge, and a transition cutting edge; the first edge extends from the first corner to the second corner and approaches the second surface as it approaches the second corner; the second blade portion extends linearly from the second corner to the first corner and approaches the second surface as it approaches the first corner; the transition edge portion is connected to the first edge portion and the second edge portion and approaches the second surface as it approaches the first corner; When the outer circumferential surface is viewed from the front, the inclination angle of the transition blade portion is larger than the inclination angle of the second blade portion, The front corner surface includes a first front corner surface, a second front corner surface, and a third front corner surface, The first front corner surface is provided along the first blade portion, The second front corner surface is provided along the second blade portion, The third front corner surface is provided along the transition edge portion, The debris groove surface is connected to the first front corner surface and the third front corner surface, and is spaced from the second front corner surface; The restraining surface is connected to the second front corner surface. A cutting blade characterized by:

2. The debris groove surface is closer to the second surface than the restraint surface.

2. The cutting blade of claim 1.

3. The debris groove surface has a first end closest to the first corner and a second end closest to the second corner, the first end being tangent to the first front corner surface and the second end being tangent to the third front corner surface, the debris groove surface having a most recessed portion closest to the second surface, the most recessed portion being located between the first end and the second end.

3. A cutting blade according to claim 2.

4. In a direction extending along the first edge, the most recessed portion is closer to the first corner than a connection point between the first cutting edge portion and the transition cutting edge portion.

4. A cutting blade as claimed in claim 3.

5. When viewed from a direction in which the restraint surface is viewed squarely, a projection length of the distance from the first end to the second end in a direction extending along the first edge is L1, a projection length of the distance from the first end to the most recessed portion in a direction extending along the first edge is L2, and L2 / L1=1 / 2 to 2 / 3.

5. A cutting blade according to claim 4.

6. the angle between the debris groove surface and the plane on which the restraining surface lies is α; the debris groove surface has a first position from the first end to the most recessed portion and a second position closer to the most recessed portion than the first position; The angle α at the first position is smaller than the angle α at the second position.

4. A cutting blade as claimed in claim 3.

7. At different positions between the first end and the second end, the angle α varies in a range of 0°<α<40°.

7. A cutting blade according to claim 6.

8. The front corner surface further includes an extension surface connected between the first front corner surface and the debris groove surface, and in a direction toward the central axis, the extension surface approaches the second surface as it moves away from the first front corner surface.

3. A cutting blade according to claim 2.

9. The angle between the extension surface and the plane on which the restraining surface is located is β, and the range of change of the angle β at different positions in the direction in which the extension surface extends along the first edge is 0°<β<35°.

9. A cutting blade according to claim 8.

10. The projection length of the debris groove surface in the direction extending along the first edge is 1 / 7 to 1 / 3 of the side length of the first surface. A cutting blade according to any one of claims 1 to 9.

11. The length of the first blade portion is greater than the length of the second blade portion. A cutting blade according to any one of claims 1 to 9.

12. A cutting blade according to any one of claims 1 to 11 attached to the shank. A cutting tool characterized by:

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