JP2024508990A - Cutting blades and cutting tools - Google Patents

Abstract

A first surface (11) exhibiting a rotationally symmetrical polygon, a second surface (12) located on the opposite side of the first surface (11), and the first surface (11) and the second surface. (12); and a central axis (CL) passing through the center of the first surface (11) and the center of the second surface (12). ), the first surface (11) is provided along a first edge (111), a first corner (112), a second corner (113), and the first edge. a front corner surface (114), a waste disposal groove surface (115) provided along the front corner surface (114), and a waste disposal groove surface (115) provided along the front corner surface (114) and the waste disposal groove surface (115). a restraining surface (116), the first edge (111) comprising a first blade (1111), a second blade (1112) and a transition blade (1113); The surface (114) includes a first front corner surface (1141) provided along the first blade portion (1111) and a second front corner surface (1141) provided along the second blade portion (1112). a surface (1142) and a third front corner surface (1143) provided along the transition blade section (1113); The waste groove surface (115) is connected to the first front corner surface (1141) and the third front corner surface (1143), and is separated from the second front corner surface (1142). move away from This cutting blade provides a good chip disposal effect and is advantageous in reducing the blade size. The present invention further provides a cutting tool.

Description

Detailed description of the invention

〔Technical field〕
TECHNICAL FIELD The present invention relates to the field of cutlery, and in particular to cutting blades and cutting tools.

[Background technology]
Chinese patent application CN105478873A discloses a cutting blade with an asymmetrical cutting edge. The blade has two opposing surfaces and four circumferential sides, the two opposing surfaces and each of the four circumferential sides forming four cutting edges, each cutting edge having a first portion; The second part is divided into the transition radius. Here, when the first partial length is L1 and the second partial length is L2, L1>L2, and the transition radius is not located at the midpoint of the cutting blade. This technical solution solves the problem of increasing the height of the shoulder available for cutting with a cutting blade.

However, in this technical proposal, it is necessary to guarantee the cutting performance of the blade, so the blade can generally have a large leading angle, and at the same time has a sufficiently large restraint surface for restraint and control of the debris. Because of the need to have a front corner surface for the blade, the space between the front corner surface and the restraining surface is small, and the waste clearance space is small, the blade is generally large, uses a lot of raw material, and has a high cost. Further, 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 forming the blade tend to occur.

[Summary of the invention]
An object of the present invention is to provide a cutting blade that provides good cutting and waste disposal effects and is advantageous in reducing the blade size.

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

In order to solve the above technical problem, the present invention employs the following technical means.

One aspect of the present invention provides a cutting blade comprising a first surface, a second surface, an outer peripheral surface, and a central axis,
the first surface exhibits a rotationally symmetrical polygon;
a second surface is located opposite the first surface;
an outer peripheral surface is located between the first surface and the second surface,
a central axis passes through the center of the first surface and the center of the second surface,
The first surface includes a first edge, a first corner, a second corner, a front corner surface, a waste groove surface, and a restraining surface,
a first corner connected to the first edge;
a second corner is connected to the first edge;
a front corner surface is provided along the first edge and approaches the second surface as it moves away from the first edge;
The waste groove surface is provided along the front corner surface, and moves away from the second surface as it moves away from the front corner surface,
a restraining surface is provided along the front corner surface and the waste 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 blade, a second blade, and a transition blade, the first blade extending from the first corner to the second corner, and the first edge extending from the first corner to the second corner. as it approaches the second corner of the second surface,
a second blade portion extends linearly from the second corner to the first corner, and approaches the second surface as it approaches the first corner;
a transition blade portion is connected to the first blade portion and the second blade portion and approaches the second surface as it approaches the first corner;
When looking directly at the outer peripheral surface, the inclination angle of the transition blade part is larger than the inclination angle of the second blade part,
The front corner surface includes a first front corner surface, a second front corner surface, and a third front corner surface,
a first front corner surface is provided along the first blade portion,
a second front corner surface is provided along the second blade portion,
a 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 separated from the second front corner surface.

In some embodiments, the debris groove surface is closer to the second surface than the restraint surface.

In some embodiments, the waste groove surface has a first end closest to the first corner and a second end closest to the second corner, and the first end is the second end is in contact with the third front corner surface, and the waste evacuation groove surface is in contact with the first front corner surface, and the waste groove surface is located at the most concave portion closest to the second surface with respect to the restraint surface. The recessed portion is located between the first end and the second end.

In some embodiments, in a direction extending along the first edge, the recess is closer to the first corner than to the connection between the first blade and the transition blade.

In some embodiments, the projected length of the distance from the first end to the second end in the direction extending along the first edge when viewed from the direction in which the restraining surface is viewed from the front is: L1, and the projected length of the distance from the first end to the recessed point in the direction extending along the first edge is L2, L2/L1=1/2 to 2/3. It is.

In some embodiments, the angle between the waste groove surface and the plane in which the restraining surface is located is α, and the angle between the first end and the recessed position is α. the angle α at the first position is smaller than the angle α at the second position.

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

In some embodiments, the front corner surface further includes an extending surface connected between the first front corner surface and the waste evacuation groove surface, and in the direction toward the central axis, the The extension surface approaches the second surface as it moves away from the first anterior angle surface.

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

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

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

Another aspect of the present invention provides a cutting tool that includes a shank and the above-described cutting blade attached to the shank.

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 blade part on the first edge is configured to extend obliquely, increasing the extension length of the blade part and ensuring the machining performance of the blade. Since the restraining surface is recessed on the second surface more than the blade on the first surface, it is possible to have a large waste clearance space between the restraining surface and the blade, and at the same time, the first front corner surface It can be ensured that the blade has sufficient width and angle, which is convenient to ensure the cutting performance of the blade and guide the evacuation of chips. By installing the chip evacuation groove surface, the chips generated along the first front corner surface are blocked, the chips are turned over, and are discharged to the outside of the blade along the chip evacuation groove surface. It is possible to prevent chips from being scraped by the upper uncut second blade portion, and to achieve a good protective effect on the cutting blade. This guide for the chips on the waste groove surface makes it easier to remove the chips, saves the waste space of the cutting blade, guarantees the same cutting blade shape, and reduces the overall shape of the cutting blade. It is advantageous to reduce the overall size of the cutting blade, which can reduce the amount of blade raw material used and reduce costs.

[Brief explanation of the drawing]
[FIG. 1] A schematic diagram of an embodiment of the cutting blade of the present invention.
[FIG. 2] A schematic stereoscopic view of an embodiment of the cutting blade of the present invention.
[FIG. 3] A schematic view of the cutting blade in FIG. 2 as seen from the outer circumferential surface.
[FIG. 4] A top view of FIG. 3.
[FIG. 5] It is an enlarged view of a part of the part A in FIG. 4.
[FIG. 6] A sectional view taken along line GG in FIG. 5.
[FIG. 7] A sectional view taken along line HH in FIG. 5.
[FIG. 8] A sectional view taken along line JJ in FIG. 5.

[Explanation of symbols]
1. Cutting blade, 2. Shank, 3. Fastener,
11, first surface, 111, first edge, 1111, first blade part, P, connection point, 1112, second blade part, 1113, transition blade part, 112, first corner, 1121, First corner blade, 113, Second corner, 1131, Second corner blade, 114, Front corner surface, 1141, First front corner surface, 1142, Second front corner surface, 1143, 3 front angle surface, 1145, extension surface, 115, waste groove surface, 1151, first end, 1152, second end, 1153, most recessed part, 116, restraint surface, 118, groove,
12, second surface;
13, outer peripheral surface,
14, central hole, CL, central axis.

[Form for carrying out the invention]
Exemplary embodiments embodying the features and advantages of the invention are described in detail in the following description. The invention is capable of various changes in different embodiments without departing from the scope of the invention, and the description and illustrations thereof are not used to limit the invention, but are illustrative in nature. It should be understood that it is used for

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.

In this example, the shank 2 is of face milling construction. A plurality of cutting blades 1 are attached along the circumferential direction of the shank 2 and process a workpiece as the shank 2 rotates.

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

The specific configuration of the cutting blade 1 will be described in detail below in conjunction with the drawings.

Referring to FIGS. 2 to 8, the cutting blade 1 of this embodiment is a blade used in a transposable manner. In particular, in this embodiment, this cutting blade 1 can also be used on both sides.

This cutting blade 1 has a first surface 11, a second surface 12 located on the opposite side of the first surface 11, and an outer peripheral surface located between the first surface 11 and the second surface 12. 13. The cutting blade 1 further has a central hole 14 passing through the first surface 11 and the second surface 12, through which the fastener 3 passes to attach the cutting blade 1 to the shank 2 (see FIG. ). The first surface 11 and the second surface 12 both exhibit rotationally symmetric polygons, and the first surface 11 and the second surface 12 exhibit centrosymmetrical symmetry with each other, and the center of the first surface 11 and the second surface The centers of the surfaces 12 are located on the central axis CL of the center hole 14. The cutting blade 1 as a whole is rotationally symmetrical about the central axis CL.

Referring to FIG. 2, the first surface 11 has a first edge 111, a first corner 112 connected to one end of the first edge 111, and a first corner 112 connected to the other end of the first edge 111. a second corner 113 provided along the first edge 111, a front corner surface 114 provided along the front corner surface 111, a waste disposal groove surface 115 provided along the front corner surface 114, and a front corner surface 114 and the waste disposal groove. and a restraining surface 116 provided along the surface 115.

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

Referring to FIG. 4, the projection of the first surface 11 has a generally square shape, transitioning in arcs at the four corners of the square. Here, the length of the side of the square is defined as L0, and the length L0 of this side 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 sides of the square. The distance between the two opposing first edges 111 is the side length L0 of the first surface 11.

The first corner 112 and the second corner 113 are connected between two adjacent first edges 111, respectively. The first corner 112 and the second corner 113 actually have the same structure, and are only artificially distinguished in name for ease of representation, and specifically, as shown in FIG. With reference to the drawing direction, for one concrete 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 clockwise direction of the first edge 111. It is located counterclockwise of the edge 111 of. In this embodiment, the first corner 112 and the second corner 113 both have a circular arc shape, and both ends of the circular arc are connected to two adjacent first edges 111, respectively. In other embodiments, the first corner 112 and the second corner 113 may be straight and connected to two adjacent first corners 111 at an angle, in which case the first A transition in the angle of inclination is formed at the four corners of the square onto which the surface 11 is projected.

A first corner blade 1121 is provided at the first corner 112, and a second corner blade 1131 is provided at the second corner 113. In the direction from the first corner 112 or the second corner 113 toward the central axis CL, it can be connected to the restraint surface 116 via a step-shaped plane or curved surface, and these planes or curved surfaces A front corner of the corner blade 1121 or the second corner blade 1131 is defined.

Referring to FIGS. 2 and 3, the first edge 111 is connected between the first blade part 1111, the second blade part 1112, and the first blade part 1111 and the second blade part 1112. A transition blade portion 1113 is provided.

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 stages, or may extend in a shape that combines a straight line and a curved line. The shape can be designed according to actual needs.

One end of the first cutting edge 1111 is in smooth transition contact with the first corner 112 and the other end is in smooth transition contact with the transition cutting edge 1113, where the first cutting edge 1111 and the transition The connection point of the blade portion 1113 is indicated as P. In this embodiment, the first blade part 1111 has a large extension length, and the connection point P is deflected to the second corner 113, that is, the connection point P and the second corner 113 are The distance between the connection point P and the first corner 112 is smaller than the distance between the connection point P and the first corner 112.

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 smaller 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.

The transition blade 1113 extends linearly between the first blade 1111 and the second blade 1112 and approaches the second surface 12 as it approaches the first corner 112. As shown in FIG. 3, the angle between the transition blade portion 1113 and the plane S perpendicular to the central axis CL is defined as the inclination angle θ3 of the transition blade portion 1113. The inclination angle θ3 of the transition blade portion 1113 is larger than the inclination angle θ2 of the second blade portion 1112.

In use, this cutting blade 1 includes a first blade part 1111 on one first edge 111, a second blade part 1112 on the adjacent first edge 111, a transition blade part 1113, and a transition blade part 1113 between these parts. A workpiece is machined at right angles by combining the first corner blade part 1121 or the second corner blade part 1131 connected between the two first edges 111. Here, the first blade part 1111 generally processes the side end surface of the workpiece as a main cutting edge, and the combination of the second blade part 1112 and transition blade part 1113 works as a sub-cutting edge or a light-reflecting blade to process the side end surface of the workpiece. Process the bottom surface. In this embodiment, the first blade part 1111 has a large extension length, so that machining efficiency can be guaranteed. It has a two-stage structure formed by combining the second blade part 1112 and the transition blade part 1113, and is designed with different inclination angles, so that it can be used as a secondary cutting edge even when the blade size is limited. It is possible to give a long length and guarantee its processing performance.

Referring to FIG. 2, the front corner surface 114 extends from the first edge 111 in the direction of the center hole 14 by a certain width, and approaches the second surface 12 as it moves away from the first edge 111. Such inclined extension of the front corner surface 114 ensures the width and angle of the front corner surface 114, guarantees the strength and sharpness of the cutting edge, and chip evacuation performance, and further guarantees the cutting performance of the cutting blade 1. do.

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

Referring to FIGS. 2 and 4, the waste groove surface 115 extends from the front corner surface 114 toward the center hole 14, and as it moves away from the front corner surface 114, it separates from the second surface 12. The waste groove surface 115 is connected to the first front corner surface 1141 and the third front corner surface 1143 and is separated from the second front corner surface 1142. In the direction extending along the first edge 111, the waste discharge surface 115 is in contact with a part of the first front corner surface 1141, a part of the third front corner surface 1143, and a part of the second front corner surface 1143. It is not in contact with the front corner surface 1142.

This waste 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 improving the cutting performance of the cutting blade 1. guaranteed. At the same time, chips generated by the cutting of the first blade part 1111 are generated along the first front corner surface 1141 and come into contact with the waste groove surface 115, and then, due to the inclined installation of the waste groove surface 115, The chips are blocked by the waste groove surface 115 and turned over, and are later discharged along the waste groove surface 115 in a direction away from the first surface 11, that is, to the outside of the cutting blade 1, so that the same first edge This provides a good protective effect on the cutting blade, which can prevent chips from being rubbed against the non-cutting second blade portion 1112 on the cutting edge 111. Guidance of chips by this chip evacuation groove surface 115 makes evacuation of chips easier, saves the evacuation space of the cutting blade 1, and reduces the overall shape of the cutting blade 1 if a similar cutting edge shape is guaranteed. This is advantageous in reducing the overall size of the cutting blade 1, reducing the amount of blade raw material used and reducing costs.

Preferably, the waste groove surface 115 is generally closer to the second surface 12 than the restraining surface 116, thus providing a larger chip handling space between the waste groove surface 115 and the first blade portion 1111. This makes it easier to turn up and remove chips.

Referring to FIG. 5, in this embodiment, the front corner surface 114 further includes an extension surface 1145, and the waste groove surface 115 is in contact with the extension surface 1145 and has a first front corner surface 1141 and a first front corner surface 1141. 3 is connected to the front corner surface 1143 of No. 3.

Here, the extension surface 1145 extends from the first front corner surface 1141 in the direction of the center hole 14, and extends toward the second surface 12 as it moves away from the first front corner surface 1141 in the direction toward the center axis CL. Get closer. In the direction extending along the first edge 111, the extension surface 1145 is in contact with a part of the first front corner surface 1141, a part of the third front corner surface 1143, and a part of the second front corner surface 1143. It is not in contact with the corner surface 1142.

In this example, the debris channel 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 the boundary of the waste groove surface 115 in the direction extending along the first edge 111, and the first end 1151 is connected to the waste groove surface 115 through the extending surface 1145. The second end 1152 is in contact with the third front angle surface 1143 via the extension surface 1145.

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, that is, the waste waste in the direction extending along the first edge 111. The projected length of the groove surface 115 is L1.

In some preferred embodiments, L1 is 1/7 to 1/3 of the side length L0 of the first surface 11, ie, L1/L0=1/7 to 1/3. In this design range, the waste groove surface 115 has sufficient length to achieve the expected chip and debris removal effect, while the waste groove surface 115 has a large area of the first surface 11. The restraint surface 116 can have a sufficient area to ensure the locking effect on the shank 2 of the cutting blade 1, and overall balance the cutting debris disposal effect and restraint locking effect. be able to.

5 to 8, the waste groove surface 115 is surrounded by an extension surface 1145 and forms a groove 118 that is recessed into the second surface 12 relative to the restraint surface 116.

Referring to FIGS. 6 to 8, the waste groove surface 115 smoothly transitions and contacts the extension surface 1145 at the bottom of the groove 118. When viewed from the first edge 111 toward the central axis CL with reference to the vertical direction in the drawing direction of FIGS. Surface 1145 constitutes a downwardly sloping portion of groove 118.

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

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

Similarly, the angles β between different positions of the extension surface 1145 and the plane where the restraining surface 116 is located are not exactly the same, and in FIGS. 6 to 8, the angles β are distinguished as β1, β2, and β3, respectively. show. In the extending direction along the first edge 111, the inclination angle of the extending surface 1145 with respect to the restraint surface 116 changes gradually, and here, the side of the extending surface 1145 near the first edge 111 is , the extension surface 1145 is in contact with the first front corner surface 1141 and the third front corner surface 1143, and further has an appropriate angle and shape with the first front corner surface 1141 and the third front corner surface 1143. Migrated and connected. The specific curved shape of the extending surface 1145 can be rationally designed depending on the actual situation.

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

Furthermore, as can be seen from the cross-sections at different positions shown in FIGS. It is a curved surface that is not the same. Here, the bottom of the groove 118 has the deepest recess 1153 with respect to the restraining surface 116, ie, closest to the second surface 12, as shown in FIG.

This recessed part 1153 is the position where the waste groove surface 115 is closest to the second surface 12 with respect to the restraint surface 116, and the recessed part 1153 is the position where the first end 1151 and the second end 1152 are located. between. It has a first position from the first end 1151 to the most recessed part 1153 and a second position closer to the most recessed part 1153, and the restraint surface 116 is located at the waste groove surface 115 and the first position. The angle α with the plane is smaller than the corresponding angle α in the second position. In some embodiments, the angle α between the waste groove surface 115 and the plane on which the restraint surface 116 is located is designed to gradually increase in the direction from the first end 1151 to the most recessed portion 1153. be able to.

Preferably, the recessed part 1153 is closer to the first corner 112 than the connection point P between the first blade part 1111 and the transition blade part 1113 in the direction extending along the first edge 111. The first blade part 1111 is provided at an angle, and the closer it gets to the transition blade part 1113, the closer it gets to the second surface 12. The groove 118 formed by the correspondingly disposed waste groove surface 115 and the extension surface 1145 can increase the waste removal space of the first blade part 1111 in this part, and at the same time, the recessed part 1153 is Since it is closer to the first corner 112 than the connection point P, at the position of the corresponding connection point P, the scrap evacuation groove surface 115 forms an upward slope with respect to the deepest recess 1153, thereby facilitating the removal of chips. This is advantageous for ensuring the waste removal effect, reducing the area that the waste removal groove surface 115 occupies on the first surface 11, and making it possible to better secure the area of the restraint surface 116 and enhance the restraint effect. .

In some embodiments, the projected length of the distance from the first end 1151 to the most recessed point 1153 in the extending direction along the first edge 111 is L2, and preferably this projected length is , 1/2 to 2/3 of the total projected length L1 of the waste groove surface 115, that is, L2/L1=1/2 to 2/3.

The first surface 11 has been described in detail above, 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 both are rotationally symmetrical. and can be replaced by reversing. 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.

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 plurality of side surfaces parallel to the central axis CL, and is connected between the first surface 11 and the second surface 12. Depending on the extended shape of the outer edge of the surface 12 , it may include flat and arcuate surfaces to suitably connect the first surface 11 and the second surface 12 .

Although the invention has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is illustrative and not restrictive. The embodiments described above are not limited to the details described above, as the invention may be embodied in various forms without departing from the spirit or substance of the invention, but as set forth in the appended claims. It is to be understood that all changes and modifications that come within the scope and spirit of the claims and their equivalents are to be covered by the appended claims. .

1 is a schematic diagram of an embodiment of a cutting blade of the present invention. 1 is a schematic stereoscopic view of an embodiment of a cutting blade of the present invention; FIG. FIG. 3 is a schematic view of the cutting blade in FIG. 2 viewed from the outer circumferential surface. FIG. 4 is a top view of FIG. 3; FIG. 5 is a partially enlarged view of location A in FIG. 4. FIG. 6 is a sectional view taken along line GG in FIG. 5. FIG. 6 is a sectional view taken along line HH in FIG. 5. FIG. 6 is a sectional view taken along line JJ in FIG. 5. FIG.

Claims (12)

a first surface exhibiting a rotationally symmetrical polygon; a second surface located on the opposite side of the first surface; and an outer peripheral surface located between the first surface and the second surface. , a cutting blade comprising a central axis passing through the center of the first surface and the center of the second surface,
The first surface includes a first edge, a first corner, a second corner, a front corner surface, a waste 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 waste waste groove surface is provided along the front corner surface, and moves away from the second surface as it moves away from the front corner surface,
The restraint surface is provided along the front corner surface and the waste 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 blade portion, a second blade portion, and a transition blade portion,
the first blade portion 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 blade portion is connected to the first blade portion and the second blade portion, and approaches the second surface as it approaches the first corner;
When looking directly at the outer peripheral surface, the inclination angle of the transition blade part is larger than the inclination angle of the second blade part,
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 cutting blade characterized in that the waste groove surface is connected to the first front corner surface and the third front corner surface and is separated from the second front corner surface. The cutting blade according to claim 1, wherein the waste groove surface is closer to the second surface than the restraint surface. The waste groove surface has a first end closest to the first corner and a second end closest to the second corner, and the first end is located at the first front corner surface. the second end is in contact with the third front corner surface, the waste groove surface has a recess closest to the second surface with respect to the restraint surface, and the waste groove surface has a recess closest to the second surface, and 3. The cutting blade of claim 2, wherein a recess is located between the first end and the second end. 3. In a direction extending along the first edge, the recess is closer to the first corner than a connection point between the first blade part and the transition blade part. The cutting blade described in. When viewed from the direction in which the restraining surface is viewed straight, the projected length of the distance from the first end to the second end in the direction extending along the first edge is L1, and A projected length of the distance from the end of the edge to the recessed point in the direction extending along the first edge is L2, and L2/L1=1/2 to 2/3. Cutting blade according to claim 4. The angle between the waste groove surface and the plane on which the restraint surface is located is α, and there is a first position from the first end to the recessed position and a second position closer to the recessed position. Cutting blade according to claim 3, characterized in that it has a position, the angle α in the first position being smaller than the angle α in the second position. The cutting blade according to claim 6, characterized in that at different positions between the first end and the second end, the range of change of the angle α is 0°<α<40°. The front corner surface further includes an extending surface connected between the first front corner surface and the waste waste groove surface, and in the direction toward the central axis, the extending surface 3. The cutting blade according to claim 2, wherein the cutting blade approaches the second surface as it moves away from the anterior angle surface of the first surface. The angle between the extension surface and the plane on which the constraint 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 as follows: The cutting blade according to claim 8, characterized in that 0°<β<35°. A projected length of the waste groove surface in a direction extending along the first edge is 1/7 to 1/3 of the side length of the first surface. 9. The cutting blade according to any one of 9. The cutting blade according to any one of claims 1 to 9, wherein the length of the first blade portion is greater than the length of the second blade portion. A cutting blade comprising a shank and the cutting blade according to any one of claims 1 to 11 attached to the shank.

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