JP5196951B2 - Cutting tool and cutting method - Google Patents

Description

  The present invention relates to a cutting tool and a cutting method used for cutting metal parts and the like.

  2. Description of the Related Art Conventionally, a cutting tool having a structure shown in FIG. 8 is known as a cutting tool used for grooving and parting off of metal parts and the like. The cutting tool 1 includes a cutting insert 2 and a tool holder 3. The tool holder 3 has an upper jaw part 30, a lower jaw part 31, and a holding part 32 that connects the two. The upper surface 20 and the lower surface 21 of the cutting insert 2 are sandwiched between the upper jaw portion 30 and the lower jaw portion 31 of the tool holder, and the rear end surface 22 of the cutting insert 2 is disposed so as to face the holding portion 32 of the tool holder 3. Yes.

  In the cutting insert 2, a first corner portion 23 is formed between the rear end surface 22 and the upper surface 20, and a second corner portion 24 is formed between the rear end surface 22 and the lower surface 21. On the other hand, the holding portion 32 is formed with a first relief portion 33a in order to avoid interference with the first corner portion 23, and in order to avoid interference with the second corner portion 24, the second relief portion 33b. Is formed.

  As described above, as a technique related to a cutting tool having a relief portion in the tool holder, for example, as disclosed in Patent Document 1, the first relief portion, the second relief portion, and a position between these two relief portions are used. And the technique in which the contact surface 33c contact | abutted with the rear-end surface 22 of the cutting insert 2 is formed is disclosed.

According to the said patent document 1, interference with the corner | angular part of a cutting insert and a tool holder can be avoided.
Special table 2002-536191 gazette

  When grooving is performed using the cutting tool as described above, the force applied to the cutting edge varies discontinuously due to the behavior of the generated chips and the like. At that time, a non-constant force, that is, a cutting load, is repeatedly applied over a long period from the rear end portion of the cutting insert to the upper jaw portion, the lower jaw portion, and the holding portion in the vicinity of the escape portion of the tool holder. At this time, the relief portion receives force from the upper jaw portion and the lower jaw portion, and the interval between the opening end portions which are one end and the other end of the relief portion is widened. As a result, the tool holder starts with the relief portion as a starting point. There was a problem that a crack occurred in the lower jaw part, and the part was damaged. Also, when moving the upper jaw upward to remove the cutting insert from the tool holder, especially in a cutting tool using a clamping method in which the cutting insert is mounted in a self-constraining manner, the tool starts from the relief portion near the upper jaw. There was a problem that the holder was damaged.

  In view of the above-described problems, an object of the present invention is to reduce the force applied to the relief portion of the tool holder, thereby suppressing the occurrence of cracks in the upper jaw portion and the lower jaw portion and the breakage of the tool holder, and a highly durable cutting tool. Is to provide.

  A cutting tool according to claim 1 of the present invention is a tool having a cutting insert, an upper jaw part and a lower jaw part that sandwich the upper and lower surfaces of the cutting insert, and a holding part that holds the upper jaw part and the lower jaw part. A cutting tool including a holder, wherein the cutting insert has a rear end surface disposed so as to face the holding portion, and a first corner portion between the upper surface and the rear end surface, A relief portion having a second corner portion between a lower surface and the rear end surface, wherein the holding portion of the tool holder has a concave surface spaced from at least one of the first corner portion and the second corner portion. The elastic member is attached to the concave surface in a non-contact state with the cutting insert.

The relief portion has an upper opening end portion located on the upper surface side of the cutting insert and a lower opening end portion located on the lower surface side, and the elastic member is formed on the concave surface and the cutting insert is not yet formed. It is preferable that the upper opening end and the lower opening end are fixed in a state of being elastically deformed in advance so as to urge the upper opening end and the lower opening end in a narrowing direction.

Further, the relief portion has an upper opening end portion located on the upper surface side of the cutting insert and a lower opening end portion located on the lower surface side, and the elastic member is the upper opening end portion of the concave surface. It is preferable that it is fixed in the vicinity of the lower opening end .

  Moreover, it is preferable that the said holding | maintenance part of the said tool holder has a contact surface contact | abutted with the said rear end surface of the said cutting insert.

  Preferably, the escape portion includes a first relief portion that is separated from the first corner portion and a second relief portion that is separated from the second corner portion.

  Moreover, it is preferable that the elastic member is mounted on each concave surface of the first relief portion and the second relief portion.

  Moreover, it is preferable that the cross-sectional shape of the said elastic member in the plane which passes along the said upper surface and lower surface of the said cutting insert along the longitudinal direction of the said tool holder has a recessed part opened toward the said cutting insert.

  Moreover, it is preferable that all the contact portions of the elastic member and the concave surface are bonded.

  A cutting tool according to claim 9 includes a cutting insert, a tool holder having an upper jaw part and a lower jaw part that sandwich an upper surface and a lower surface of the cutting insert, and a holding part that holds the upper jaw part and the lower jaw part. The cutting insert includes a rear end surface disposed to face the holding portion, a first corner portion between the upper surface and the rear end surface, and the lower surface and the rear surface. Each having a second corner between the end surface, the holding portion of the tool holder has a relief portion having a concave surface spaced from at least one of the first corner and the second corner, An elastic member for applying a force for suppressing the escape portion from being spread is attached to the concave surface.

  The cutting method of the present invention is a cutting method of cutting a work material using any one of the above-described cutting tools, a proximity step of relatively bringing a cutting tool closer to the work material, and the work material A cutting step of rotating the material, bringing the cutting edge into contact with the surface of the work material to cut the surface of the work material, and a separation step of moving the work material and the cutting tool relatively apart from each other. It is characterized by comprising.

  The cutting tool of the present invention generates a repulsive force in the elastic member fixed to the concave surface of the escape portion when the interval between both opening end portions of the escape portion is widened during cutting and removal of the cutting insert. A repulsive force can be applied to the concave surface in the direction of narrowing both the opening end portions, and the force applied to the escape portion can be reduced. Therefore, generation | occurrence | production and damage of the crack in an escape part are suppressed, As a result, a more durable cutting tool can be provided.

  In addition, the cutting method using the cutting tool of the present invention reduces the force applied to the relief from the cutting insert during cutting, and can prevent damage to the tool holder, and can be applied to the work material for a long time. Cross cutting can be performed stably.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of a cutting tool 5 according to the present invention, and is a partial perspective view showing a state in which a cutting insert 6 is detached from a tool holder main body 7. FIG. 2 is a partial side view showing the cutting tool 5 shown in FIG. 1 and a state in which the cutting insert 6 is mounted on the tool holder 7.

  As shown in FIGS. 1 and 2, the cutting tool 5 includes a cutting insert 6 and a tool holder 7. The cutting insert 6 has an upper surface 60 and a lower surface 61 sandwiched between an upper jaw portion 70 and a lower jaw portion 71 of the tool holder 7, and is mounted so that a rear end surface 62 faces the holding portion 72. In FIG. 2, the boundary between the holding part 72 and the upper jaw part 70 and the boundary between the holding part 72 and the lower jaw part 71 are indicated by alternate long and short dash lines (the same applies to FIGS. 4 and 6 showing other embodiments).

  In the cutting insert 6, a first corner 63 is formed between the upper surface 60 and the rear end surface 62, and a second corner 64 is formed between the lower surface 61 and the rear end surface 62 of the cutting insert 6. On the other hand, the holding portion 72 of the tool holder 7 is formed with a relief portion 73 opened toward the cutting insert 6 in a side view of the tool holder 7 in order to avoid interference with the first corner portion 63 and the second corner portion 64. Has been. As shown in FIG. 2, the escape portion 73 is formed with an upper opening end portion 73 c located on the upper surface 60 side of the cutting insert 6 and a lower opening end portion 73 d located on the lower surface 61 side.

  As a feature of the present invention, the cutting tool 5 includes an elastic member 8, and the elastic member 8 is fixed to the concave surface 73 e of the escape portion 73. As the elastic member 8, rubber, a spring, or the like is used. In the case of the metallic elastic member 8, it is preferable that the elastic member 8 is formed of a metal having a lower Young's modulus than the holding portion 72. Moreover, when these elastic members 8 deform | transform between the cutting insert 6 and the concave surface 73e of the escape part 73, it is preferable not to plastically deform. In the present invention, fixing is performed using an adhesive, a screw member, or the like. When the elastic member is fixed to the concave surface, the concave surface and the elastic member are bonded to each other at the fixing portion and are not separated from each other.

  With the above configuration, when the concave surface 73e receives a force in a direction in which the distance between the upper opening end portion 73c and the lower opening end portion 73d increases, the elastic member 8 is fixed to the concave surface 73e. It is elastically deformed in the same way. Then, due to the elastic deformation of the elastic member 8, a repulsive force acting in the direction of narrowing the interval between the upper opening end 73c and the lower opening end 73d is generated. Thereby, the force applied to the escape portion 73 from the cutting insert 6 is alleviated, and the occurrence of cracks in the upper jaw portion 70 and the lower jaw portion 71 starting from the escape portion 73 can be suppressed.

  In addition, as shown in FIG. 2, the elastic member 8 disposed in the escape portion 73 is separated from the cutting insert 6. Thereby, it can prevent that the elastic member 8 interferes with the 1st corner | angular part 63 and the 2nd corner | angular part 64 at the time of cutting, As a result, the failure | damage of the elastic member 8 is suppressed and the force concerning the escape part 73 is applied. Can continue to relax. Furthermore, since the cutting insert 6 and the elastic member 8 can be prevented from interfering with each other when the cutting insert 6 is attached or detached, the working efficiency can be improved.

  In the present embodiment, the cutting insert 6 is positioned in the front-rear direction using the rear end surface 62 by the tapered portion of the upper jaw 70, but the present invention is not limited to this, and for example, the cutting insert 6 and Instead of providing the upper jaw portion 70 with a tapered portion, the holding portion 72 may be provided with a portion that contacts the rear end surface 62 of the cutting insert 6. That is, when the cutting insert 6 is clamped, the cutting tool 5 has a structure that facilitates positioning in the front-rear direction and prevents the cutting insert 6 from shifting toward the rear end of the holding portion 72 during cutting. It ’s fine. As a result, stable cutting can be performed on the work material.

  In the first embodiment, when the tool holder 7 opens the upper jaw part 70 and mounts the cutting insert 6, the repulsive force generated in the direction in which the upper jaw part 70 and the lower jaw part 71 are narrowed is used as a restraining force. Although the clamping system in which the cutting insert 6 is mounted in a restraint manner is used, the implementation form of the cutting tool according to the present invention is not limited to the above-described fixing system. For example, as shown in FIG. 3 to be described later, a cutting insert clamping method using a clamp screw member 9 can also be used. In this case, since it is not necessary to provide a taper part in the upper jaw part 70 of the tool holder 7, the upper surface 60 is parallel to the lower surface 61, and the cutting insert 6 which has a 2nd cutting blade in the 1st corner | angular part 63 is mounted | worn. be able to. As a result, since the cutting blades on both sides can be used for cutting, it is possible to provide a cutting tool that is excellent in economic efficiency.

  Next, another embodiment according to the present invention will be described with reference to the drawings.

  FIG. 3 is a partial perspective view showing a second embodiment of the cutting tool according to the present invention. FIG. 4 is a partial side view of FIG. FIG. 5 is a partial perspective view of a tool holder in the cutting tool according to the second embodiment.

  In the present embodiment, as shown in FIG. 3, the cutting insert 6 is formed with a concave upper clamp portion 60 a on the upper surface 60 and a concave lower clamp portion 61 a on the lower surface 61. On the other hand, as shown in FIG. 5, the tool holder 7 has a convex upper jaw clamp portion 70 a formed on the upper jaw portion 70 and a lower jaw clamp portion 71 a formed on the lower jaw portion 71. When the insert is disposed, the upper jaw clamp portion 70a and the upper clamp portion 60a, and the lower jaw clamp portion 71a and the lower clamp portion 61a are fitted to each other, so that the cutting insert 6 is laterally displaced from the tool holder 7 during the cutting process. In addition, it is possible to perform stable cutting on the work material.

  Furthermore, by forming the upper jaw clamp part 70a and the lower jaw clamp part 71a, the area where the upper jaw part 70 and the lower jaw part 71 are in contact with the cutting insert 6 is increased. Thereby, the pressure concerning the upper jaw part 70 and the lower jaw part 71 at the time of cutting is more effectively disperse | distributed, As a result, damage to the tool holder 7 can be suppressed.

  Further, a clamp screw member 9 is disposed on the tool holder 7, and the cutting insert 6 is clamped and fixed by tightening the clamp screw member 9. In this case, it is preferable that the clamp screw member 9 is disposed closer to the portion holding the cutting insert 6. Thereby, the vibration of the tool holder 7 at the time of cutting can be relieved, As a result, the damage of the tool holder 7 can be suppressed.

  Further, as shown in FIGS. 3 and 4, the holding portion 72 of the tool holder 7 is opened to the cutting insert 6 in a side view of the tool holder 7 in order to avoid interference with the first corner portion 63. One escape portion 73 a is formed, and in order to avoid interference with the second corner portion 64, a second relief portion 73 b opened toward the cutting insert 6 in the side view of the tool holder 7 is formed. The first escape portion 73a and the second escape portion 73b are each provided with an elastic member 8, and these elastic members 8 are provided on the concave surface 73e of the first escape portion 73a and the second escape portion 73b. Each is fixed to the concave surface 73e.

  With the above configuration, since the force applied to each escape portion from the cutting insert 6 can be reduced, the generation and breakage of cracks in the first escape portion 73a and the second escape portion 73b are suppressed, and the durability is higher. A cutting tool 5 can be provided.

  Furthermore, conditions such as the shape and elastic modulus of each elastic member 8 disposed in the first relief portion 73a and the second relief portion 73b can be optimized according to each cutting tool. Thereby, a more durable cutting tool can be provided.

  Only one of these two elastic members 8 may be provided. In this case, generation | occurrence | production or the breakage | damage of the crack in the escape part to which the elastic member 8 was fixed among the 1st escape part 73a and the 2nd escape part 73b can be suppressed.

  Moreover, in this embodiment, as shown in FIG. 4, the elastic member 8 is spaced apart from the cutting insert 6, respectively. Thereby, it can prevent that the elastic member 8 interferes with the 1st corner | angular part 63 and the 2nd corner | angular part 64 at the time of cutting, As a result, the failure | damage of the elastic member 8 is suppressed and the force concerning the escape part 73 is applied. Can continue to relax. Further, since the cutting insert 6 and the elastic member 8 can be prevented from interfering with each other when the cutting insert 6 is attached and detached, the working efficiency can be improved. Furthermore, when the cutting insert 6 that can be used at the two corners is used for the cutting tool 5 of the present embodiment, the cutting blade is damaged by interference with the elastic member 8, or the rake surface formed on the upper surface 5 Since the situation where the flank formed on the rear end face 62 is missing can be avoided, a cutting tool with excellent economy can be provided.

  In addition, a contact surface 72a that contacts the rear end surface 62 of the cutting insert 6 is formed between the first clearance portion 73a and the second clearance portion 73b. This facilitates positioning in the front-rear direction when holding the cutting insert 6 and prevents the cutting insert 6 from being displaced in the direction of the rear end of the holding portion 72 during cutting. Stable cutting can be performed on the material.

  In addition, as shown in FIG. 4, the contact surface 72 a of the tool holder 7 is in surface contact with the rear end surface 62 of the cutting insert 6 in this embodiment. Thereby, compared with the case where it contacts two places of the upper jaw part 70 and the lower jaw part 71 like 1st embodiment, the pressure applied to the tool holder 7 from the cutting insert 6 at the time of a cutting process can be disperse | distributed more effectively. The durability of the tool holder 7 can be increased.

  In addition, the elastic member 8 is elastically deformed in advance so as to apply a force to the concave surface 73e so as to reduce the distance between both opening end portions, that is, the interval between the upper opening end portion 73c and the lower opening end portion 73d. It is fixed with. Thereby, even when minute vibration of the cutting insert 6 continues during cutting, the repulsive force generated in the elastic member 8 as described above can be opposed to the force applied from the cutting insert 6 to the escape portion 73. Therefore, the generation of cracks in the escape portion 73 and the damage to the tool holder 7 can be suppressed.

  Further, in the present embodiment, the elastic member 8 is fixed to the vicinity of the upper opening end portion 73c positioned on the upper side of each escape portion 73 and the vicinity of the lower opening end portion 73d positioned on the lower side.

  Thereby, since the force concerning the upper opening end part 73c and the lower opening end part 73d can be relieved directly, generation | occurrence | production and the breakage of the crack in the escape part 73 can be suppressed more effectively.

  Moreover, as shown in FIG. 5, the corner | angular part is not formed in the concave surface 73e of the 1st escape part 73a, and the concave surface 73e of the 2nd relief part 73b. Thereby, it can prevent that the force applied to the 1st escape part 73a and the 2nd escape part 73b from the cutting insert 6 concentrates on one place of each concave surface, As a result, in the 1st escape part 73a and the 2nd escape part 73b The generation and breakage of cracks can be suppressed.

  Further, as shown in FIG. 6, the cross-sectional shape of the elastic member 8 in a plane passing through the upper surface 60 and the lower surface 61 of the cutting insert 6 along the longitudinal direction of the tool holder 7 is a concave portion that opens toward the cutting insert 6. have. Thereby, the work efficiency at the time of fixing the elastic member 8 to the recessed part 73e can be improved.

  Further, the elastic member 8 and all the abutting portions of the concave surface 73e are bonded to the concave surface 73e. Thereby, since the pressure applied to the concave surface 73e from the elastic member 8 can be effectively dispersed, the generation and breakage of cracks in the escape portion 73 can be effectively suppressed.

  Next, a third embodiment of the cutting tool according to the present invention will be described with reference to FIG. 7 which is a partial side view thereof.

  As shown in FIG. 7, the third embodiment of the cutting tool according to the present invention uses a clamping method in which the cutting insert 6 is mounted in a self-constraining manner as in the first embodiment. Specifically, cutting is performed by the tapered surface and the lower jaw portion 71 in which the surface of the upper jaw portion 70 that contacts the upper surface 60 of the cutting insert 6 is inclined with respect to the surface of the lower jaw portion 71 that contacts the lower surface 61 of the cutting insert 6. The insert 6 is restrained. Therefore, in this embodiment, only one cutting edge is formed on the cutting insert 6 and, unlike the second embodiment, only one side is used for cutting. In this case, since the screw hole is not formed in the tool holder 7, the rigidity of the tool holder 7 can be increased as compared with the case where the clamp screw member 9 is provided.

  Moreover, in this embodiment, the contact part 72a is not formed in the holding | maintenance part 72 of the tool holder 7, and the escape part 73 is not divided up and down like 2nd embodiment. In this case, since the radius of curvature of the concave surface 73e is larger than that of the second embodiment, the force applied to the escape portion 73 from the cutting insert 6 at the time of cutting is more effectively dispersed. Generation | occurrence | production and damage can be suppressed and the more durable cutting tool 5 can be provided.

  In addition, the tool holder 7 is formed with a slit 72 b extending from the escape portion 73 to the rear end side of the tool holder 72. Thereby, when arrange | positioning the cutting insert 6, the up-and-down movement of the upper jaw part 70 becomes easy and the attachment of the cutting insert 6 can be performed easily.

  As mentioned above, although the embodiment of the cutting tool according to the present invention has been shown by taking the cutting tool for grooving as an example, the cutting tool according to the present invention is not limited to the above embodiment and deviates from the object of the invention. Needless to say, it can be arbitrary as long as it is not.

  Next, a cutting method for cutting a work material using the cutting tool according to the present invention will be described with reference to the drawings.

  9 to 11 show process diagrams of a cutting method for cutting a work material using the cutting tool according to the present invention. First, the cutting insert 6 is attached to the tool holder 7. Then, as shown in FIG. 9, the work material 10 is rotated to bring the cutting edge 65 of the cutting tool 5 closer to the work material 10. The cutting blade 65 and the work material 10 may be relatively close to each other. For example, the work material 10 may be close to the cutting tool 5.

  Next, as shown in FIG. 10, the work material 10 is cut by bringing the cutting edge 65 into contact with the work material 10. Thereafter, the cutting tool 5 is separated from the work material 10 as shown in FIG. In addition, when continuing a cutting process, the state which rotated the workpiece 10 is maintained and the process of making the cutting blade 65 of the cutting tool 5 contact the different location of the workpiece 10 is repeated.

  As a result, the force applied to the relief portion 73 of the tool holder 7 during the cutting process is alleviated, damage to the tool holder 7 can be suppressed, and the workpiece 10 can be subjected to stable cutting over a long period of time. be able to.

  Although the grooving process has been described as an example of the cutting method, it can be used for other cutting processes such as an inner diameter process.

It is one Embodiment of the cutting tool which concerns on this invention, and is a partial perspective view of the state from which the cutting insert was removed from the holder main body. It is a partial side view showing one embodiment of a cutting tool concerning the present invention. It is a fragmentary perspective view which shows 2nd embodiment of the cutting tool which concerns on this invention. It is a partial side view which shows 2nd embodiment of the cutting tool which concerns on this invention. It is a fragmentary perspective view of a tool holder among the cutting tools shown in FIG. It is sectional drawing of an elastic member among the cutting tools shown in FIG. It is a partial side view which shows 3rd embodiment of the cutting tool which concerns on this invention. It is a conventional cutting tool, and is a partial perspective view of a state where a cutting insert is removed from a tool holder body. It is process drawing of the cutting method which concerns on this invention. It is process drawing of the cutting method which concerns on this invention. It is process drawing of the cutting method which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cutting tool 2 ... Cutting insert 20 ... Upper surface 21 ... Lower surface 22 ... Rear end surface 23 ... 1st corner | angular part 24 ... 2nd corner | angular part 25 ... Cutting blade 3 ... Tool holder 30 ... Upper jaw part 31 ... Lower jaw part 32 ... Holding part
33 ... Escape part 33a ... 1st relief part 33b ... 2nd relief part 33c ... Contact surface 5 ... Cutting tool 6 ... Cutting insert 60 ... Upper surface 60a ... Upper clamp part 61 ... lower surface 61a ... lower clamp part 62 ... rear end face 63 ... first corner part 64 ... second corner part 65 ... cutting edge 7 ... tool holder 70 ... Upper jaw part 70a ... Upper jaw clamp part 71 ... Lower jaw part 71a ... Lower jaw clamp part 72 ... Holding part
72a ... abutment surface 72b ... slit 73 ... escape portion 73a ... first relief portion 73b ... second relief portion 73c ... upper opening end portion 73d ... lower opening end portion 73e ... concave surface 8 ... elastic member 9 ... clamp screw member 10 ... work material

Claims (10)

Cutting inserts,
A tool holder having an upper jaw and a lower jaw holding the upper and lower surfaces of the cutting insert, and a holding portion holding the upper jaw and the lower jaw;
A cutting tool comprising:
The cutting insert has a rear end surface arranged to face the holding portion, a first corner between the upper surface and the rear end surface, and a second corner between the lower surface and the rear end surface. Each has
The holding part of the tool holder has a relief part having a concave surface spaced from at least one of the first corner part and the second corner part,
An elastic member is attached to the concave surface in a non-contact state with the cutting insert. The escape portion has an upper opening end located on the upper surface side of the cutting insert, and a lower opening end located on the lower surface side,
The elastic member is fixed to the concave surface in a state of being elastically deformed in advance so as to urge the upper opening end and the lower opening end in a direction in which the cutting insert is not mounted. The cutting tool according to claim 1, wherein: The escape portion has an upper opening end located on the upper surface side of the cutting insert, and a lower opening end located on the lower surface side,
The cutting tool according to claim 1 or 2, wherein the elastic member is fixed in the vicinity of the upper opening end and the lower opening end in the concave surface.   The cutting tool according to claim 1, wherein the holding portion of the tool holder has a contact surface that contacts the rear end surface of the cutting insert.   The said escape part is provided with the 1st relief part spaced apart from said 1st corner | angular part, and the 2nd relief part spaced apart from said 2nd corner | angular part, The any one of Claims 1-4 characterized by the above-mentioned. Cutting tools.   The cutting tool according to claim 5, wherein the elastic member is mounted on the concave surfaces of the first relief portion and the second relief portion. The cross-sectional shape of the elastic member in a plane passing through the upper surface and the lower surface of the cutting insert along the longitudinal direction of the tool holder has a concave portion that opens toward the cutting insert. 6. The cutting tool according to any one of 6.   The cutting tool according to any one of claims 1 to 7, wherein all the abutting portions of the elastic member and the concave surface are bonded. Cutting inserts,
A tool holder having an upper jaw and a lower jaw holding the upper and lower surfaces of the cutting insert, and a holding portion holding the upper jaw and the lower jaw;
A cutting tool comprising:
The cutting insert has a rear end surface arranged to face the holding portion, a first corner between the upper surface and the rear end surface, and a second corner between the lower surface and the rear end surface. Each has
The holding part of the tool holder has a relief part having a concave surface spaced from at least one of the first corner part and the second corner part,
The cutting tool characterized by the elastic member which provides the force which suppresses that the said escape part is expanded being attached to the said concave surface in the non-contact state with the said cutting insert . A cutting method for cutting a work material using the cutting tool according to claim 1,
A proximity step of relatively bringing a cutting tool closer to the work material;
A cutting step of rotating the work material, bringing the cutting edge into contact with the surface of the work material, and cutting the surface of the work material;
And a separation step of relatively separating the work material and the cutting tool.

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