JP7370392B2 - Inserts, cutting tools, and methods for cutting work materials using the same cutting tools - Google Patents

Description

The present disclosure relates to an insert, a cutting tool, and a method for cutting a workpiece using the cutting tool.

For example, wood, metal, or the like (hereinafter referred to as a workpiece material) is cut by a cutting tool while being fixed to a machine tool. A cutting tool for cutting a workpiece material has, for example, an insert with a cutting edge facing outward. The workpiece is cut into the desired size and shape by the contact between the inserts. As a cutting tool equipped with such an insert, the cutting tool described in International Publication No. 2005/068117 (Patent Document 1) is known.

A cutting insert according to one aspect of the present disclosure includes an upper surface, a lower surface located on the opposite side of the upper surface, a side surface connecting the upper surface and the lower surface, and a cutting edge located at a boundary between the side surface and the upper surface. have. The upper surface is connected to a corner that is located at the boundary with the side surface and has a convex curve shape bulging outward in a plan view, and forms the cutting edge together with the corner. a side part, a rake face extending along the side part and the corner part and directed downward as the distance from the side part and the corner part increases, and a rising face separated from the cutting blade via the rake face. It has . The rake face has a first rake face along the corner and a second rake face along the side. The rising surface includes a first region located on a straight line that bisects the corner, and a second region connected to the first region and at least a part of which is along the second rake surface. have. The width of the second rake face becomes smaller as the distance from the first rake face increases in plan view. The first region has a curved shape that curves along the corner in a cross section along the horizontal direction. The first region and the second region each have an inclination angle that increases upward as the distance from the rake face increases. The inclination angle of the first region is greater than the inclination angle of the second region.

A cutting tool according to one aspect of the present disclosure includes a holder extending from a first end toward a second end, and the cutting insert fixed to the first end.

A method for cutting a workpiece according to one aspect of the present disclosure includes a step of rotating a workpiece, and a step of bringing the cutting tool into contact with the rotating workpiece to cut the workpiece. , and a step of separating the cutting tool from the cut work material.

FIG. 2 is a diagram illustrating a situation in which a workpiece is cut by a cutting tool attached to a machine tool. FIG. 2 is a perspective view of the cutting tool shown in FIG. 1; Figure 3 is a perspective view of the insert shown in Figure 2; FIG. 4 is an enlarged view of the cutting portion of the insert shown in FIG. 3; 5A is a sectional view taken along the line VA-VA in FIG. 4, including the main body shown in FIG. 3. FIG. 5B, including the main body shown in FIG. 3, is a sectional view taken along the line VB-VB in FIG. is a cross-sectional view taken along the line VC-VC in FIG. 4 including the main body portion in FIG. 3, and FIG. 5D is an enlarged view along VD in FIG. 5C. FIG. 6 is a plan view showing the relationship between the rake face and the first rising face shown in FIG. 4. 3 is a diagram illustrating a method of cutting a workpiece using the cutting tool shown in FIG. 2. FIG. FIG. 8A is a diagram showing a workpiece being cut with a small depth of cut, FIG. 8B is a diagram showing a workpiece being cut with a larger depth of cut than FIG. 8A, and FIG. 8C is a diagram showing a workpiece being cut with a larger depth of cut than FIG. 8B. This is a diagram showing a work material being cut with a large depth of cut. It is a figure which showed the insert by a modification.

Embodiments of the present disclosure will be described below using the accompanying drawings. Regarding the front, rear, left, right, top and bottom directions, Fr indicates the front, Rr indicates the rear, Le indicates the left, Ri indicates the right, Up indicates the top, and Dn indicates the bottom, with reference to FIG. Note that each drawing to be referred to is shown schematically and details may be omitted.

Furthermore, the above-mentioned front, back, left, right, top, and bottom directions are used in relation to the attached drawings, and are not limited to the front, back, left, right, top, and bottom of the real space. That is, the above directions are not intended to be limited to predetermined directions in real space.

[Embodiment]
Please refer to FIG. For example, a workpiece Ob (wood, metal, etc.) and the cutting tool 10 may be fixed to the machine tool Mt. The workpiece Ob may be rotatable via the machine tool Mt, and the cutting tool 10 may be movable back and forth, left, right, up and down via the machine tool Mt. Here, a cutting insert 11 (hereinafter referred to as an insert) capable of cutting the workpiece Ob may be located at the tip of the cutting tool 10. For example, by pressing the insert 11 against the rotating workpiece Ob, the workpiece Ob is cut into a desired size and shape.

(Cutting tools)
The cutting tool 10 is detachably attached to a machine tool Mt (turret). The cutting tools 10 include an outer diameter cutting tool that cuts the outer diameter of the workpiece Ob, an inner diameter cutting tool that cuts the inner diameter of the workpiece Ob, a grooving tool that makes grooves etc. on the workpiece Ob, a thread cutting tool, and Examples include cut-off tools. The cutting tool 10 can also be called a cutting tool.

See FIG. 2. As shown in FIG. 2, the cutting tool 10 may include an insert 11, a holder 70 that supports the insert 11, and a clamp 13 that urges the insert 11 toward the holder 70. The insert 11 may be fixed to a tip 70a (hereinafter also referred to as a first end 70a) of the holder 70. Each element constituting the cutting tool 10 will be explained below. First, the insert 11 in a state removed from the holder 70 will be focused on and explained. Next, focusing on the holder 70 with the insert 11 attached, this will be explained. The clamp 13 will be explained during the explanation of the insert 11 and the holder 70.

As shown in FIG. 2, the insert 11 may be a replaceable insert called a throw-away insert. The insert 11 may be located in a pocket 72a of the holder 70 that lacks the tip 70a side, and may be fixed by the clamp 13.

The shape of the insert 11 is arbitrary. The shape of the insert 11 may be set depending on the material and shape of the workpiece Ob (see FIG. 1). As shown in FIG. 2, the insert 11 may have a square plate shape. In other embodiments, the insert 11 may have a triangular plate shape or a pentagonal plate shape. The insert 11 may have a symmetrical shape (as shown in the figure) or an asymmetrical shape with respect to a plane that is parallel to the vertical direction and includes the VA-VA line (FIG. 4).

The size of the insert 11 is arbitrary. For example, the thickness (length in the vertical direction) of the insert 11 may be 5 mm or more and/or 20 mm or less. For example, the width (length in the left-right direction) of the insert 11 may be 10 mm or more and/or 20 mm or less.

The material of the insert 11 is arbitrary. For example, the material of the insert 11 may be PCD (polycrystalline diamond), CBN (cubic boron nitride), cemented carbide, etc. CBN is, for example, a sintered composite material made of ceramic and metal. Specific examples of CBN include titanium compounds containing TiC and/or TiN as main components. The cemented carbide may be, for example, WC-Co, WC-TiC-Co and WC-TiC-TaC-Co. WC, TiC and TaC are hard particles. On the other hand, Co is a bonding phase.

The insert 11 may be made of one type of material or may be made of a plurality of materials. The insert 11 including a plurality of materials may have, for example, a portion made of CBN and the remainder made of cemented carbide. In the insert 11 made of CBN and cemented carbide, the ratio of CBN to cemented carbide may be 1% or less, 3% or less, 7% or more, or 7% or more. For example, only the tip of the insert 11 that is pressed against the workpiece Ob (see FIG. 1) may be made of CBN. That is, the ratio occupied by CBN may be smaller than the ratio occupied by cemented carbide. This allows the amount of CBN, which is more expensive than cemented carbide, to be reduced. As a result, an inexpensive insert 11 can be provided. Regarding the explanation of the ratio of PCD and cemented carbide, the explanation of the ratio of CBN and cemented carbide can be referred to.

Please refer to FIGS. 2 and 3. The insert 11 may include a main body portion 30 and a cutting portion 40 . For example, the body portion 30 may occupy the majority of the insert 11. When the main body 30 occupies most of the insert 11, the above description of the shape and size of the insert 11 may be used for the shape and size of the main body 30. The main body portion 30 may be urged toward the holder 70 by the clamp 13.

Please refer to FIGS. 3 and 4. The cutting part 40 is a part that can cut the workpiece Ob (see FIG. 1). The cutting portion 40 may be located, for example, at a corner of the main body portion 30, which has a polygonal shape (rectangular shape in FIG. 3) in plan view. The cutting part 40 has a blade part 41 facing outward.

The blade portion 41 of the cutting portion 40 can contact and cut the workpiece Ob in a state where the insert 11 is fixed to the holder 70 (see FIG. 2). The blade portion 41 includes a cutting edge 41a, a rake face 53, and a flank face 43a, which will be described later.

See FIG. 3. The material of the cutting part 40 may be the same as the material of the main body part 30 or may be different from the material of the main body part 30. In one embodiment, the cutting part 40 may be made of CBN, and the main body part 30 may be made of cemented carbide. In another aspect, the cutting part 40 may be made of PCD, and the main body part 30 may be made of cemented carbide. In yet another aspect, the cutting section 40 and the main body section 30 may be made of cemented carbide. The combination of materials for the main body portion 30 and the cutting portion 40 is arbitrary. Note that the color of the cutting portion 40 may be the same as the color of the main body portion 30 or may be different from the color of the main body portion 30.

In FIG. 3, an insert 11 with only one cutting part 40 is shown. However, the insert 11 may have two cutting parts 40, or may have three or more cutting parts 40. In one aspect, the insert 11 may have a rectangular plate shape and have cutting portions at each of four corners (four cutting portions in total). In another aspect, the insert 11 may have a triangular plate shape and have cutting portions at each of three corners (three cutting portions in total). In yet another embodiment, the insert 11 may have a pentagonal plate shape and have five cuts at each of the five corners (total of five cuts).

Insert 11 may have a top surface 21, a bottom surface 22, and side surfaces 23. Furthermore, the insert 11 may be provided with a through hole 11 a that opens on the upper surface 21 and the lower surface 22 . The upper surface 21 and the side surface 23 constitute a blade portion 41 of the insert 11. The blade portion 41 comes into contact with the workpiece Ob (see FIG. 1), and this is cut.

(Top surface)
Please refer to FIGS. 2 and 3. The upper surface 21 may be a surface facing above the main body portion 30 and the cutting portion 40 . The upper surface 21 may be a surface that the clamp 13 comes into contact with when the insert 11 is fixed to the holder 70 .

The upper surface 21 may have a rectangular shape (including a diamond shape), a triangular shape, or a pentagonal shape, for example. The upper surface 21 may or may not be parallel to the lower surface 22. The upper surface 21 may have unevenness at least in part.

Please refer to FIGS. 3 and 4. As shown in FIG. 3, the upper surface 21 may include a main body upper surface 31 and a cutting portion upper surface 50. The main body upper surface 31 is a surface formed by the main body 30 and faces upward.

(Top surface of cutting part)
The cutting portion upper surface 50 is a surface that constitutes the cutting portion 40 and faces upward. The main body upper surface 31 may be a smooth surface as a whole, or may be a surface having irregularities in some places.

The proportion of the cutting portion upper surface 50 in the upper surface 21 may be 3% or less, 7% or less, 15% or less, or 15% or more. The shape of the cutting part upper surface 50 is arbitrary. For example, the cutting portion upper surface 50 may have a triangular shape, a rectangular shape, or a substantially V-shape (including a U-shape).

See FIG. 4. The cutting part upper surface 50 includes a corner 51 located at a corner of the cutting part upper surface 50, sides 52, 52 connected to this corner 51, and a rake face extending along these corners 51 and sides 52, 52. 53, a connecting surface 54 connected to the rake surface 53, a rising surface 60 connected to the connecting surface 54 and directed upward as the distance from the rake surface 53 increases, and this rising surface 60 and the upper surface 31 of the main body (see FIG. 3). It may have a connecting surface 55 for connecting.

(corner)
Please refer to FIGS. 4 and 6. The corner portion 51 may be located at the boundary with the side surface 23 on the upper surface 50 of the cutting portion. The corner portion 51 may have a convex curved shape bulging outward in a plan view. The corner portion 51 having a convex curve shape may be inclined upward, may extend horizontally, or may be inclined downward in the direction from the apex of the convex portion toward the side portions 52, 52. Good too. Note that the above-mentioned convex curve shape is not limited to a convex curve having no thickness, but may have a predetermined thickness. The curvature of the corner portion 51 exhibiting a convex curve shape is arbitrary.

(edge)
The sides 52 , 52 may each be connected to the corner 51 and extend from the corner 51 along the outer edge of the upper surface 50 of the cutting part. The ends of the sides 52, 52 remote from the corner 51 may be connected to the rising surface 60 (second rising surface 62).

One side 52 is located on the right side of the corner 51 when the corner 51 is viewed from the front. The other side 52 is located on the left side of the corner 51 when viewed from the same direction. One side 52 and the other side 52 are separated from each other.

The sides 52, 52 may have a linear shape. The linear shape may be a straight line. Linear does not necessarily mean a strict straight line. For example, assuming a straight line along the side 52, if the deviation between the side 52 and the straight line is 0.05 mm or less or 0.03 mm or less, the side 52 may be considered to be linear. . Hereinafter, the meaning of "linear" used in other explanations may be the same. Furthermore, the term "linear" is not limited to a straight line having no thickness, but may also include having a predetermined thickness and extending in a straight line.

Please refer to FIGS. 3 and 4. The sides 52, 52 may be inclined upward from the corner 51, may extend horizontally from the corner 51, or may be inclined downward from the corner 51. Note that one side portion 52 may have the same inclination angle or may have a different inclination angle in relation to the other side portion 52. For example, one side 52 may have an upwardly inclined angle, and the other side 52 may have a downwardly inclined angle.

The lengths of the side parts 52, 52 are arbitrary. For example, the side portions 52, 52 may have the same length or may have different lengths. The sides 52, 52 may be longer than the corner 51, or may be shorter than the corner 51, respectively. The side portions 52, 52 may each have the same length as the corner portion 51.

The corner portion 51 and the side portions 52, 52 may constitute a cutting edge 41a that directly contributes to cutting the workpiece Ob (see FIG. 1). The cutting edge 41a is a part of the blade portion 41. For example, the cutting edge 41a is a part of the insert 11 that bites into the workpiece Ob when cutting the workpiece Ob. The cutting edge 41a may be a ridgeline located between the cutting portion upper surface 50 and the side surface 23.

(rake face)
See FIG. 4. The rake face 53 may be connected to the sides 52 , 52 and the corner 51 . In other words, the rake face 53 may be connected to the cutting edge 41a.

The rake face 53 along the sides 52, 52 and the corner 51 may be inclined downward (toward the lower surface 22) from the sides 52, 52 and the corner 51. The inclination angle of the rake face 53 is arbitrary. For example, the inclination angle of the rake face 53 may be 10 degrees or less, 25 degrees or less, or 25 degrees or more. Further, the inclination angle of the rake face 53 may be different at each portion of the rake face 53 along the corner portion 51 and the side portions 52, 52.

See FIG. 6. The shape of the rake face 53 in plan view is arbitrary. For example, as in the example shown in FIG. 6, the rake face 53 may have a substantially V-shape (including a substantially U-shape) in plan view.

The rake face 53 may have a first rake face 53a along the corner 51, and second rake faces 53b, 53b connected to the first rake face 53a and along the sides 52, 52.

The first rake surface 53a may have a predetermined width and be curved in plan view. The width (length in the direction perpendicular to the corner 51) of the first rake face 53a may be constant (or not necessarily constant) along the corner 51 in plan view. If the width at a predetermined location of the first rake face 53a is W1, and the width at a location different from the predetermined location is W2, then W1=W2. The above-mentioned constant may be defined as, for example, when the first rake face is traced along the outer edge of the corner portion 51, the above-mentioned width does not change by 0.03 mm or more. The width of the first rake surface 53a may be, for example, 0.05 mm or more and 0.3 mm or less.

The second rake surfaces 53b, 53b may have a predetermined width. For example, the width of the second rake surface 53b (the length in the direction perpendicular to the sides 52, 52 in a plan view) may become smaller as the distance from the first rake surface 53a increases as seen in a plan view. That is, when the width of a predetermined location on the second rake faces 53b, 53b is set to W3, and the width of a part farther from this location from the first rake face 53a is set to W4, W3>W4 may be satisfied.

For example, the width of the second rake face 53b near the first rake face 53a is twice or more, four times or more, or eight times the width of the part of the second rake face 53b farthest from the first rake face 53a. It may be more than 1 time, or it may be more than 1 time and less than 2 times.

The lengths of the second rake surfaces 53b, 53b (in the direction along the sides 52, 52) may be the same or different. Further, the lengths of the second rake faces 53b, 53b may be the same or different from the length of the first rake face 53a (direction along the corner 51).

(Connection surface)
The connecting surface 54 shown in FIG. 4 connects the rake surface 53 and the rising surface 60. In the illustrated example, the connecting surface 54 is connected to the lower side of the rake surface 53 and the lower side of the rising surface 60.

The connecting surface 54 may have a predetermined width in the direction from the rake surface 53 toward the rising surface 60 (the direction perpendicular to the linear corner 51 in plan view). The width of the connecting surface 54 may be the same or different along the rake surface 53 and the rising surface 60.

(rising surface)
Again, the rising surface 60 may be connected to the connecting surface 54 and the connecting surface 55. The rising surface 60 may be spaced apart from the cutting edge 41a via the rake surface 53, and may be directed upward as the distance from the rake surface 53 increases. The lower side of the rising surface 60 may be connected to the connecting surface 54. On the other hand, the upper side of the rising surface 60 may be connected to the connection surface 55. These upper sides and lower sides may include portions that extend linearly or may include portions that extend curvedly in a side view and/or a plan view. The same applies to the upper and lower sides of each part used in the description below.

As shown in FIG. 4, the rising surface 60 may include a first rising surface 61, a second rising surface 62, and a third rising surface 63. The first rising surface 61 may be connected to the connecting surface 54 and the second rising surface 62. The third rising surface 63 may be connected to the second rising surface 62 and the connection surface 55. The second rising surface 62 may be located between the first rising surface 61 and the third rising surface 63. The first to third rising surfaces 61, 62, and 63 will be explained below.

(first rising surface)
The first rising surface 61 may be separated from the cutting edge 41a via the rake surface 53 and the connecting surface 54. The first rising surface 61 may move upward as the distance from the cutting edge 41a increases. That is, the first rising surface 61 may have an upward slope in the direction from the connecting surface 54 toward the second rising surface 62. Since the first rising surface 61 has an upward slope, a groove formed by the rake surface 53, the connecting surface 54, and the first rising surface 61 is formed in the insert 11. This groove may have a flat bottom surface, for example.

The first rising surface 61 may have a first region 61a located on the straight line L1 that bisects the corner 51, and second regions 61b, 61b connected to the first region 61a. The first region 61a may be connected to a portion of the connecting surface 54 along the corner 51. From another perspective, the first region 61a may be along the corner 51. On the other hand, the second regions 61b, 61b may be connected to portions of the connecting surface 54 along the sides 52, 52. From another viewpoint, the second regions 61b, 61b may be along the sides 52, 52. The details of the first region 61a and the second regions 61b, 61b will be described below.

(First area)
Please refer to FIGS. 4 and 5A. In one embodiment, the first region 61a may have a linear shape extending from the connecting surface 54 toward the second rising surface 62 in a cross-sectional view taken along the straight line L1 that bisects the corner portion 51. In another aspect, the first region 61a may have a linear shape curved from the connecting surface 54 toward the second rising surface 62 in a cross-sectional view along the straight line L1. The curvature may be either convex or concave.

The first region 61a may have an upward inclination angle in the direction from the connecting surface 54 toward the second rising surface 62. Here, when the inclination angle of the first region 61a is Θ1, Θ1 is, for example, 80 degrees or more and 90 degrees or less, 65 degrees or more and 80 degrees or less, 45 degrees or more and 65 degrees or less, or more than 0 degrees and less than 45 degrees. It's okay to be.

For example, the inclination angle Θ1 may be determined by measuring the inclination angle of the first region 61a in the cross section of the insert 11 along the straight line L1 (see FIG. 4). For example, when the first region 61a is curved, the inclination angle Θ1 is determined by the straight line connecting the lower side and the upper side of the first region 61a in the cross section of the insert 11 along the bisector of the corner 51. It can be found by measuring the angle of inclination of Note that the method of determining the inclination angle of the third region 62a, which will be described later, may be the same as this.

The upper side of the first region 61a may be located above, below, or at the same height as the cutting edge 41a (corner portion 51). The first region 61a may have a constant width in a direction perpendicular to the corner 51 in a plan view. For example, if the width of the first region 61a in this direction is A1, the width A1 may be constant along the first region 61a. The constant here may mean, for example, that when the first region 61a is traced along the corner 51, the above-mentioned width does not change by 0.05 mm or more.

Also refer to FIG. The first region 61a may have a convex shape facing outward (toward the cutting edge 41a) in plan view. Furthermore, in a cross-sectional view along the horizontal direction, the first region 61a may have a curved line that curves along the corner 51. This curve may appear in the entire first region 61a, in the center, or in a location away from the center in the vertical direction. However, in a cross-sectional view along the horizontal direction, the first region 61a may be configured without including a curve. The size and shape of the first region 61a are arbitrary.

(Second area)
See FIG. 4. The size of the second regions 61b, 61b is arbitrary. For example, the surface area of the second regions 61b, 61b may be larger, the same size, or smaller than the surface area of the first region 61a. The shape of the second region 61b is arbitrary. For example, the shape of the second region 61b may be approximately triangular.

See FIGS. 5B and 5C. 5B and 5C show a cross section of the insert 11 along a straight line L2 (see FIG. 4) perpendicular to the sides 52, 52 in plan view. For example, the width of the second regions 61b, 61b (the length in the direction orthogonal to the sides 52, 52 in plan view) may become smaller as the distance from the first region 61a increases. Also refer to FIG. 5D. When the width of the second region 61b in the vicinity of the first region 61a is A2, and the width of the second region 61b in a portion away from the first region 61a is A3, A2>A3 may be satisfied.

See FIG. 4. When the center of the corner portion 51 is viewed from the front, one of the second regions 61b may be located on the right side of the first region 61a. The other second region 61b may be located on the left side of the first region 61a when viewed in the same direction. One second region 61b may be the same in size as the other second region 61b, or may be different in size from the other second region 61b.

Refer to FIGS. 4 and 5B. In one embodiment, the second regions 61b, 61b may extend linearly from the connecting surface 54 toward the second rising surface 62 in a cross-sectional view along the straight line L2. In another aspect, the second regions 61b, 61b may extend in a curved shape from the connecting surface 54 toward the second rising surface 62 in a cross-sectional view along the straight line L2. The curve may be either convex or concave outward. The second regions 61b, 61b may have an upward inclination angle in the direction from the connecting surface 54 toward the second rising surface 62.

Here, if the inclination angles of the second regions 61b, 61b are Θ2, Θ2 (only the inclination angle Θ2 of one second region 61b is shown in FIGS. 5B to 5D), the inclination angles Θ2, Θ2 may be, for example, 60 degrees or more and 90 degrees or less, 35 degrees or more and 60 degrees or less, or more than 0 degrees and less than 45 degrees. However, the inclination angles Θ2, Θ2 of the second regions 61b, 61b are smaller than the inclination angle Θ1 (see FIG. 5A) of the first region 61a. The inclination angles Θ2 and Θ2 of the second regions 61b and 61b may be determined by measuring the inclination angle of the cross section along the straight line L2. If the second regions 61b, 61b are curved, it may be determined, for example, by measuring the inclination angles Θ2, Θ2 of a straight line connecting the lower and upper sides of the second regions 61b, 61b. The method of determining the inclination angles Θ4 and Θ4 of the fourth regions 62b and 62b, which will be described later, may be the same as this.

The upper sides of the second regions 61b, 61b may be located above, below, or at the same height as the cutting edge 41a (side portions 52, 52). Good too. The upper sides of the second regions 61b, 61b may have a portion at least partially located below the cutting edge 41a.

The upper sides of the second regions 61b, 61b may extend downwardly in a direction away from the first region 61a. From another perspective, the width of the second region 61b may become smaller in the direction away from the first region 61a. At this time, regarding the upper sides of the second regions 61b, 61b, a portion located near the first region 61a may be located above the cutting edge 41a, and a portion farthest from the first region 61a may be located below the cutting edge 41a. May be located in

See FIG. 6. A portion of the second region 61b located near the first region 61a may be along the corner 51 (first rake surface 53a). It can also be said that the second regions 61b, 61b may have a portion along the corner portion 51.

(Second rising surface)
See FIG. 4. The second rising surface 62 may be directed upward as the distance from the cutting edge 41a (rake surface 53) increases. That is, the second rising surface 62 may have an upward slope in the direction from the first rising surface 61 to the third rising surface 63.

The second rising surface 62 may have a third region 62a, fourth regions 62b, 62b, and fifth regions 62c, 62c. The third region 62a and the fourth regions 62b, 62b may be connected to the first rising surface 61. The fifth regions 62c, 62c may be connected to the fourth regions 62b, 62b, respectively.

(Third area)
The third region 62a may be along the corner 51. The third region 62a may have a lower side connected to the first region 61a and an upper side connected to the third rising surface 63.

The size of the third region 62a is arbitrary. For example, the surface area of the third region 62a may be larger, the same size, or smaller than the surface area of the first region 61a.

In one embodiment, the third region 62a may extend in a straight line from the first region 61a toward the third rising surface 63 in a cross-sectional view along the straight line L1 bisecting the corner 51. In another aspect, the third region 62a may curve and extend from the first region 61a toward the third rising surface 63 in a cross-sectional view along the straight line L1. Also refer to FIG. 5A. The thus curved third region 62a may have, for example, a convex shape (or a concave shape) facing outward (obliquely upward) in a cross-sectional view along the straight line L1.

The third region 62a has an upward inclination angle in the direction from the first region 61a toward the connection surface 55. When the inclination angle of the third region 62a is Θ3, the inclination angle Θ3 may be, for example, 45 degrees or more and 90 degrees or less, 25 degrees or more and 90 degrees or less, or more than 0 degrees and less than 25 degrees. The inclination angle Θ3 may be smaller than the inclination angle Θ1 of the first region 61a, for example.

The shape of the third region 62a is arbitrary. For example, the third region 62a may have a substantially rectangular or trapezoidal shape as a whole.

(Fourth area)
Please refer to FIGS. 4 and 5B. The fourth regions 62b, 62b may extend along the sides 52, 52. As shown in FIG. 4, the fourth regions 62b, 62b may have lower sides connected to the second regions 61b, 61b, and upper sides connected to the third rising surface 63.

The size and shape of the fourth regions 62b, 62b are arbitrary. For example, the surface area of the fourth regions 62b, 62b may be larger, the same size, or smaller than the surface area of the second regions 61b, 61b. The shape of the fourth regions 62b, 62b may be, for example, rectangular or trapezoidal.

The fourth regions 62b, 62b may extend straight from the second regions 61b, 61b toward the third rising surface 63, or may extend curvedly. The curvature may be either convex or concave outward. When the inclination angles of the fourth regions 62b, 62b are respectively Θ4, the inclination angles Θ4, Θ4 (only the inclination angle Θ4 of one fourth region 62b is shown in FIG. 5B) are, for example, 45 degrees or more. The angle may be 90 degrees or less, 25 degrees or more and 90 degrees or less, or more than 0 degrees and less than 25 degrees. The inclination angles Θ4, Θ4 may be smaller than the inclination angles Θ2, Θ2 of the second regions 61b, 61b. When focusing on the tilt angle Θ3 (see FIG. 5A) and the tilt angles Θ4, Θ4, the tilt angle Θ3 may be larger, smaller, or the same as the tilt angles Θ4, Θ4. It's okay.

(5th area)
The fifth regions 62c, 62c may extend from the fourth regions 62b, 62b, respectively, to the outer edge of the cutting portion upper surface 50. The size and shape of the fifth regions 62c, 62c are arbitrary. In one aspect, the surface area of the fifth regions 62c, 62c may be larger than the surface area of the second regions 61b, 61b. The surface area of the fifth regions 62c, 62c may be larger or smaller than the surface area of the fourth regions 62b, 62b, or may be the same. The shape of the fifth regions 62c, 62c may be, for example, rectangular or trapezoidal.

The fifth regions 62c, 62c may be inclined upward in the direction from the rake surface 53 toward the third rising surface 63. The thus inclined fifth regions 62c, 62c may be linear or curved from the rake surface 53 toward the third rising surface 63. The curved shape may be concave or convex toward the outside. When the inclination angles of the fifth regions 62c, 62c are respectively Θ5 (not shown in the figure), the inclination angles Θ5, Θ5 are compared with the inclination angles Θ4, Θ4 of the fourth regions 62b, 62b, for example. They may be larger, smaller, or the same.

(Third rising surface)
See FIG. 4. The third rising surface 63 may move upward as the distance from the cutting edge 41a increases. That is, the third rising surface 63 may have an upward slope in the direction from the second rising surface 61 toward the main body upper surface 31.

The third rising surface 63 may have a sixth region 63a, a seventh region 63b, 63b, and an eighth region 63c, 63c. The sixth region 63a may be connected to a portion (third region 62a) along the corner 51 of the second rising surface 62. The seventh regions 63b, 63b may be connected to portions (fourth regions 62b, 62b) along the sides 52, 52 of the second rising surface 62. The eighth regions 63c, 63c are connected to the seventh regions 63b, 63b, respectively, and extend from the seventh regions 63b, 63b to the outer edge of the insert 11.

(6th area)
Please refer to FIGS. 4 and 5A. The sixth region 63a may be along the corner 51. Regarding the description of the size and shape of the sixth region 63a, the description of the size and shape of the third region 62a may be used.

The sixth region 63a may be along the corner 51. As shown in FIG. 4, the sixth region 63a may have a lower side connected to the third region 62a and an upper side connected to the connection surface 55. Regarding the description of the size and shape of the sixth region 63a, the description of the size and shape of the third region 62a may be used.

The sixth region 63a may or may not be a curved surface. When the inclination angle of the sixth region 63a is Θ6, the inclination angle Θ6 may be smaller or larger than the inclination angle Θ3 of the third region 62a, for example.

(7th area)
Please refer to FIGS. 4 and 5B. The seventh regions 63b, 63b may be along the sides 52, 52. As shown in FIG. 4, the lower sides of the seventh regions 63b and 63b may be connected to the fourth regions 62b and 62b, and the upper sides thereof may be connected to the connection surface 55. For the description of the size and shape of the seventh regions 63b, 63b, the description of the size and shape of the fourth regions 62b, 62b may be used.

The seventh regions 63b, 63b may or may not be curved surfaces. When the inclination angles of the seventh regions 63b are respectively Θ7 (only the inclination angle Θ7 of one of the seventh regions 63b is shown in FIGS. 5B and 5C), the inclination angles Θ7 and Θ7 are, for example, the fourth The inclination angles Θ4, Θ4 of the regions 62b, 62b may be smaller, larger, or the same.

(8th area)
The eighth regions 63c, 63c connect the fifth regions 62c, 62c and the connection surface 55. Regarding the description of the size and shape of the eighth regions 63c, 63c, the description of the size and shape of the fifth regions 62c, 62c may be used.

The eighth regions 63c, 63c may or may not be curved surfaces. When the inclination angles of the eighth regions 63c, 63c are respectively Θ8 (not shown in the figure), the inclination angles Θ8, Θ8 are compared with the inclination angles Θ5, Θ5 of the fifth regions 62c, 62c. They may be larger, smaller, or the same.

The first region 61a, the third region 62a, and the sixth region 63a have portions located on the straight line L1 extending along the bisector of the corner portion 51 in plan view. On the other hand, the second regions 61b, 61b, the fourth regions 62b, 62b, and the seventh regions 63b, 63b have portions located on the straight line L2 orthogonal to the sides 52, 52 in plan view.

For example, the upper and lower sides of the first region 61a, the third region 62a, and the sixth region 63a may each have a curved shape. The upper and lower sides of the second regions 61b, 61b, the fourth to fifth regions 62b, 62b, 62c, 62c, and the seventh to eighth regions 63b, 63b, 63c, 63c may each be linear, for example. The connection surface 55 may be the surface located uppermost among the surfaces forming the cutting portion upper surface 50.

(bottom surface)
Please refer to FIGS. 2 and 3. Again, the lower surface 22 of the insert 11 is located opposite the upper surface 21. The lower surface 22 is a surface facing the holder 70 when the insert 11 is fixed to the holder 70 (see FIG. 2). The insert 11 may be fixed with the lower surface 22 in contact with the holder 70. Regarding the description of the shape of the lower surface 22, the description of the shape of the upper surface 21 may be used.

See FIGS. 3 and 5A. In the example shown in FIG. 5A, if the distance (vertical distance) from the lower side (lower edge) of the first region 61a to the lower surface 22 is D1, the distance D1 is constant along the lower side of the first region 61a. It may be. The constant here may mean, for example, that when the distance from the first region 61a to the lower surface 22 is measured along the lower side of the first region 61a, the distance does not change by 0.05 mm or more. The lower side of the first region 61a may extend along the horizontal direction.

See FIGS. 5B and 5C. The distance in the vertical direction from the lower side (lower edge) of the second regions 61b, 61b to the lower surface 22 (see FIG. 3) may become longer as the distance from the first region 61a increases. As shown in FIG. 5B, the distance from the second regions 61b, 61b to the lower surface 22 in the vicinity of the first region 61a is D2. As shown in FIG. 5C, the distance from the second regions 61b, 61b to the lower surface 22 at a location away from the first region 61a is D3. At this time, the relationship between the two may be D2<D3. That is, the lower sides (lower edges) of the second regions 61b, 61b may be inclined upward in the direction away from the first region 61a. The lower sides of the second regions 61b, 61b may have an upward slope in the direction away from the first region 61a.

The inclination angle of the lower sides of the second regions 61b, 61b may be, for example, 3 degrees or less, 10 degrees or less, 20 degrees or less, or 20 degrees or more. The lower sides of the second regions 61b, 61b constitute a boundary between the second regions 61b, 61b and the connecting surface 54.

(side)
See FIG. 3. Side surface 23 is located between upper surface 21 and lower surface 22. The side surface 23 may be a surface connecting the upper surface 21 and the lower surface 22. The side surface 23 may bulge outward, may be depressed inward, or may be a surface without curvature. Furthermore, the side surface 23 may be a smooth surface as a whole, or may be a surface having irregularities in some places.

The side surface 23 may include a main body side surface 33 and a cutting portion side surface 43. The main body side surface 33 constitutes a part of the side surface of the main body section 30. On the other hand, the cutting part side surface 43 constitutes the remainder of the side surface of the cutting part 40. The cutting part side surface 43 may be continuous with the main body part side surface 33.

Also refer to FIG. 4. The cutting portion side surface 43 may include a flank surface 43a that constitutes the blade portion 41. The flank face 43a is connected to the rake face 53 and intersects with the rake face 53 at a predetermined angle so that the insert 11 does not contact the workpiece Ob more than necessary. A cutting edge 41a is located at the boundary between the flank surface 43a and the rake surface 53. That is, it can be said that the cutting edge 41a includes the ridgeline of the flank surface 43a and the rake surface 53.

Next, the holder that constitutes the cutting tool described above will be explained. Explain this by looking at the holder in which the insert is fixed.

(holder)
See FIG. 2. The holder 70 may have a length ranging from, for example, a distal end 70a (first end 70a) to a rear end 70b (hereinafter also referred to as a second end 70b). As in the illustrated example, the holder 70 may have a rod shape. The length of the holder 70 can be set arbitrarily. For example, the length of the holder 70 may be set in a range of 50 mm or more and 200 mm or less.

The size of the holder 70 can be set arbitrarily. For example, the width (left-right direction) and thickness (up-down direction) of the holder 70 may be 10 mm or more, 19 mm or more, 25 mm or more, or 50 mm or more. The width and thickness of the holder 70 may be the same or different. The thickness of the holder 70 may increase toward the tip 70a.

The material of the holder 70 can be set arbitrarily. For example, the material of the holder 70 may be steel, cast iron, or the like. In the case of cast iron, for example, the flexibility of the holder 70 can be increased.

The holder 70 may include a shank portion 71 and a fixing portion 72. The shank portion 71 constitutes the second end 70b side of the holder 70. The shank portion 71 may be, for example, solid with a filled interior. The shape of the shank portion 71 is arbitrary. For example, in a cross section perpendicular to the direction in which the shank portion 71 extends, the shank portion 71 may have a rectangular or circular shape. As shown in FIG. 2, the shank portion 71 may have a first surface 71a, a second surface 71b, a third surface 71c, and a fourth surface 71d.

The first surface 71a may face in the direction in which the flank surface 43a of the insert 11 faces. The second surface 71b may be located on the opposite side of the first surface 71a. The third surface 71c connects the first surface 71a and the second surface 71b and may face in the direction in which the rake surface 53 faces. The fourth surface 71d connects the first surface 71a and the second surface 71b and may be located on the opposite side of the third surface 71c. The first to fourth surfaces 71d may be surfaces of the shank portion 71 that connects the second end 70b and the fixing portion 72.

The fixing portion 72 is located on the first end 70a side of the holder 70. An insert 11 capable of cutting a workpiece Ob is fixed to the fixed part 72. For example, the insert 11 may be fitted into a pocket 72a in which a portion of the fixing portion 72 is missing. The insert 11 may be secured by being biased downwardly by the clamp 13. Furthermore, the tip of the clamp 13 that biases the insert 11 toward the holder 70 may be inserted into the through hole 11 a formed in the insert 11 . The insert 11 may be fixed to the holder 70 by being sandwiched between the bottom surface of the pocket 72a and the clamp 13. As in the example shown in FIG. 2, the clamp 13 may be fixed by a screw threaded into the holder 70. The fixing portion 72 constitutes the first end 70a side of the holder 70.

Next, a method of cutting a workpiece using a cutting tool will be described.

Please refer to FIGS. 1 and 7. FIG. 7 shows each step of the work material cutting method. The work material cutting method may start, for example, with a step of attaching the work material Ob to the machine tool Mt (a step of fixing the work material). Thereafter, for example, the cutting tool 10 may be attached to the machine tool Mt (for example, a tool post) (step of fixing the tool). Note that the step of fixing the work material may be performed, for example, after the step of fixing the tool.

Once the workpiece Ob and the cutting tool 10 are fixed to the machine tool Mt, the cutting tool 10 (insert 11) may be positioned (positioning step). For example, the size and/or shape of the workpiece Ob may be checked, as well as the positional relationship between the workpiece Ob and the cutting tool 10. The positioning process may be performed manually (visually) or automatically. Next, the workpiece Ob is rotated via the machine tool Mt (rotation step). While the workpiece Ob is rotating, the cutting tool 10 may be brought into contact with the workpiece Ob via the machine tool Mt (cutting step). Specifically, the cutting portion 40 of the insert 11 may be brought into contact with the workpiece Ob. Then, the work material Ob is cut until it has a desired size and shape.

When the workpiece Ob has a desired size and shape, the cutting tool 10 may be separated from the workpiece Ob (step of releasing the cutting tool). Thereafter, the rotation of the workpiece Ob is stopped (stopping process), and the workpiece Ob is removed from the machine tool Mt (workpiece removal process). Thereby, the cut work material Ob can be obtained.

Next, the function of the insert in the present disclosure will be explained.

See FIGS. 8A-8C. These figures show the blade portion 41 coming into contact with the workpiece Ob, thereby cutting the workpiece Ob. For example, when the work material Ob is cut by the insert 11, the cut portion becomes chips Du. When the cutting depth of the insert 11 into the workpiece Ob is small, cutting is performed only around the corners 51 of the insert 11, and chips Du with a small width are generated from the workpiece Ob. On the other hand, when the cut of the insert 11 into the workpiece Ob is large, the cutting is performed by the corner portion 51 and the side portions 52, 52, and chips Du with a large width are generated from the workpiece Ob.

See FIG. 8A. FIG. 8A shows a diagram in which the workpiece Ob is cut by only a part of the corner 51 of the insert 11, thereby generating small-width chips Du. Small-width chips Du generated by cutting, for example, pass through the rake face 53 to the boundary between the first region 61a along the corner 51 and the second regions 61b, 61b along the sides 52, 52. Proceed towards Bo0. Here, the inclination angle of the first region 61a is larger than the inclination angle of the second regions 61b, 61b. Thereby, during cutting, chips Du generated by cutting the workpiece Ob can easily come into contact with the first region 61a. As a result, the speed of chips Du can be more reliably reduced during cutting.

See FIG. 8B. FIG. 8B shows a diagram in which the workpiece Ob is cut in a wide range at the corner 51 of the insert 11, thereby generating chips Du with a small width. Small-width chips Du generated by cutting advance toward the first region 61a along the corner 51, for example, via the rake face 53. Here, the inclination angle of the first region 61a is larger than the inclination angle of the second regions 61b, 61b. Thereby, during cutting, chips Du generated by cutting the workpiece Ob can easily come into contact with the first region 61a. As a result, the speed of chips Du can be more reliably reduced during cutting.

See Figure 8C. FIG. 8C shows a diagram in which the workpiece Ob is cut around the corner portion 51 and the side portions 52, 52 of the insert 11, thereby generating chips Du with a large width. Large-width chips Du generated by cutting are directed toward the first region 61a along the corner 51 and the second regions 61b, 61b along the sides 52, 52, for example, via the rake face 53. Proceed. Here, the inclination angle of the second regions 61b, 61b is smaller than the inclination angle of the first region 61a. This makes it difficult for chips Du generated by cutting the work material Ob to come into contact with the second region 61b during cutting. As a result, the chips Du directed toward the first region 61a and the second regions 61b, 61b can be guided to the outside of the insert 11 via the second regions 61b, 61b. This reduces the reduction in speed of thick chips Du.

Please refer to FIGS. 5A-5D and 8A-8C. For example, when the workpiece Ob is cut only around the corner 51 of the insert 11, the width of chips Du generated from the workpiece Ob becomes small. For example, small-width chips Du (thin chips Du) are unstable in their advancing direction, and sometimes move toward the workpiece Ob while maintaining a predetermined speed. Here, in the present disclosure, the inclination angle Θ1 of the first region 61a is larger than the inclination angles Θ2, Θ2 of the second regions 61b, 61b. Since the inclination angle Θ1 is larger than the inclination angles Θ2 and Θ2, chips Du generated by cutting the workpiece Ob easily come into contact with the first region 61a during cutting. Thereby, the thin chips Du can be brought into contact with the first region 61a, and the speed thereof can be reduced.

On the other hand, when the workpiece Ob is cut around the corner portion 51 and the side portions 52, 52 of the insert 11, the width of chips Du generated from the workpiece Ob becomes larger. For example, chips Du with a large width (thick chips Du) tend to stay on the insert 11 although the direction in which they advance is stable. Here, in the present disclosure, the width of the second rake surface 53b becomes smaller as the distance from the first rake surface 53a increases in plan view. This makes it easier for the thick chips Du to move toward the second region 61b. In addition, the inclination angles Θ2, Θ2 of the second region 61b are smaller than the inclination angle Θ1 of the first region 61a. As a result, it is possible to reduce the possibility that the speed of the thick chips Du moving toward the second region 61b will decrease.

According to the insert 11 of the present disclosure, the speed can be reduced when the chips Du are thin, and the speed can be prevented from decreasing when the chips Du are thick. That is, it is possible to reduce the possibility that the chips Du will go to the workpiece Ob and the possibility that the chips Du will stay on the insert 11. Therefore, it is possible to provide the insert 11 that allows stable cutting.

See FIG. 6. The width of the first rake face 53a is constant along the corner 51. Since the width of the first rake face 53a is constant along the corner 51, chips Du generated by cutting around the first rake face 53a can stably move toward the first region 61a. That is, the thin chips Du cut around the first rake face 53a (see FIGS. 8A and 8B) can be brought into contact with the first region 61a more reliably. As a result, it is possible to provide the insert 11 that allows more stable cutting.

Please refer to FIGS. 5B and 5C together. The width of the second region 61b in a direction perpendicular to the side portions 52, 52 becomes smaller as the distance from the first region 61a increases in plan view. As a result, as the width of the chips Du increases, the risk of the chips Du coming into contact with the second region 61b more forcefully is reduced. As a result, it is possible to provide the insert 11 that allows more stable cutting.

Please refer to FIGS. 5A and 6. The first region 61a has a constant width along the corner 51 in a direction perpendicular to the corner 51 in a plan view. Thereby, it is possible to stabilize the moving direction of the thin chips Du generated by cutting and coming into contact with the first region 61a. As a result, it is possible to provide the insert 11 that allows more stable cutting.

Please refer to FIGS. 4, 5B and 5C. The lower edge of the second region 61b is directed upward as the distance from the first region 61a increases. Thereby, the thick chips Du can move upward along the second region 61b. As a result, the risk of thick chips Du remaining on the insert 11 is reduced. Therefore, it is possible to provide the insert 11 that allows more stable cutting.

The second region 61b has a portion along the first rake surface 53a. This makes it easier for the chips Du that have come into contact with the first region 61a to move along the second region 61b. As a result, the risk of chips Du remaining on the insert 11 can be reduced. Therefore, it is possible to provide the insert 11 that allows more stable cutting.

See FIG. 2. The cutting tool 10 has an insert 11 fixed to the first end 70a side. Thereby, it is possible to provide the cutting tool 10 that can stably cut the workpiece Ob.

Please refer to FIGS. 1 and 7. The method for cutting a workpiece according to the present disclosure includes a step of bringing the cutting tool 10 into contact with the workpiece Ob and cutting the workpiece Ob. Furthermore, the cutting tool 10 includes the insert 11 described above. Therefore, it is possible to provide a method for cutting a workpiece material that enables more stable cutting.

[Modified example]
See FIG. 9. FIG. 9 shows a cross-sectional view of an insert 11A in a modified example. FIG. 9 corresponds to FIG. 5A above. For parts common to the insert 11 shown in the embodiment, reference numerals are used and detailed explanations are omitted.

(Top surface of cutting part)
The cutting portion upper surface 50A may include a corner portion 51, side portions 52, 52, a rake surface 53, and a rising surface 60A. The first rising surface 61A is connected to the lower side of the rake surface 53. The first rising surface 61A is inclined upward in the direction from the rake surface 53 toward the second rising surface 62.

The first region 61Aa may be connected to the lower side of the rake face 53 along the corner 51. As shown in FIG. 9, the groove formed by the rake face 53 and the first region 61Aa may have a substantially V-shape (including a substantially U-shape) in a cross-sectional view that bisects the corner portion 51. good. That is, the rising surface 60 (first rising surface 61) may be separated from the cutting blade 41a only via the rake surface 53.

The lower side (lower edge) of the first region 61Aa may be connected to the rake surface 53. From another viewpoint, the lower side of the first region 61Aa may constitute a boundary between the first region 61Aa and the rake face 53. The lower side (lower edge) of the second region 61Ab may be connected to the rake surface 53. From another viewpoint, the lower side of the second region 61Ab may constitute a boundary between the second region 61Ab and the rake surface 53.

The insert and cutting tool in the present disclosure are not limited to the embodiments and modifications described above. Below, some examples of inserts and cutting tools with modified shapes will be introduced.

For example, in the embodiment, the rising surface is constituted by the first to third rising surfaces. However, in the insert of the present disclosure, for example, the third rising surface may be eliminated if necessary. That is, the second rising surface may be directly connected to the connection surface. For example, the third region may be connected to a portion along a corner of the connection surface, and the fourth region may be connected to a portion along a side of the connection surface.

For example, in embodiments, the illustrated cutting tool is right-handed. However, the cutting tool in the present disclosure is not limited to right-hand use, but is also applicable to left-hand use. Furthermore, the cutting tool according to the present disclosure can also be applied without a handle.

10... Cutting tool 11... Insert 21, 21A... Top surface 22... Bottom surface 23... Side surface 41a... Cutting edge 51... Corner part 52... Side part 53... Rake face 60, 60A... Rising surface 61a, 61Aa... First region 61b, 61Ab ...Second region 70...Holder 70a...First end 70b...Second end Mt...Machine tool Ob...Work material L1...Straight line L2...Straight line

Claims (8)

It has an upper surface, a lower surface located on the opposite side of the upper surface, a side surface connecting the upper surface and the lower surface, and a cutting edge located at the boundary between the side surface and the upper surface,
The upper surface is
a corner located at the boundary with the side surface and exhibiting a convex curved shape bulging outward in plan view;
a side portion connected to the corner portion and forming the cutting edge together with the corner portion;
a rake face extending along the side portion and the corner portion and facing downward as the distance from the side portion and the corner portion increases;
a rising surface separated from the cutting edge via the rake face;
has
The rake face is
a first rake face along the corner;
a second rake face along the side portion;
has
The rising surface is
a first region located on a straight line that bisects the corner;
a second region connected to the first region and at least partially along the second rake face;
has
The width of the second rake face becomes smaller as the distance from the first rake face increases in plan view;
The first region has a curved shape that bends along the corner in a cross section along the horizontal direction,
The first region and the second region each have an inclination angle that increases upward as the distance from the rake face increases,
The inclination angle of the first region is larger than the inclination angle of the second region. Cutting insert. The cutting insert according to claim 1, wherein the width of the first rake face is constant along the corner. The cutting insert according to claim 1 or 2, wherein the width of the second region in a direction perpendicular to the side portion becomes smaller as the distance from the first region increases in plan view. The cutting insert according to any one of claims 1 to 3, wherein the first region has a constant width in a direction perpendicular to the corner when viewed from above. The cutting insert according to any one of claims 1 to 4, wherein the lower edge of the second region is directed upward as the distance from the first region increases. The cutting insert according to any one of claims 1 to 5, wherein the second region has a portion along the first rake surface. a holder extending from the first end toward the second end;
The cutting insert according to any one of claims 1 to 6, fixed to the first end side;
Has a cutting tool. A process of rotating the work material,
A step of bringing the cutting tool according to claim 7 into contact with the rotating work material and cutting the work material;
a step of separating the cutting tool from the cut work material;
A method of cutting the workpiece material.

Images