Cutting edge replaceable cutting tool

Abstract

To provide a cutting edge replaceable cutting tool that can properly supply a coolant to a cutting edge of an L-shape cutting insert.SOLUTION: A cutting edge replaceable cutting tool comprises a holder having an upper jaw part and a lower jaw part opposing to each other and a cutting insert held between the upper jaw part and the lower jaw part. The cutting insert has a rod-like body part and a rod-like cutting blade part connected to the body part through a bent part and extended in a direction crossing the body part, in a planar view in which a seating surface supported by the lower jaw part is set as a lower surface. The holder comprises a coolant discharge port that opens on a surface of the upper jaw part and discharges a coolant and a flow path attachment having an internal flow path through which the coolant discharged from the coolant discharge port is guided to a cutting edge of the cutting insert.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cutting tool with an exchangeable cutting edge.

Background Art

[0002] Conventionally, a cutting tool for internal groove machining with an L-shaped cutting insert is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a cutting tool with an L-shaped cutting insert, the cutting insert is bent in a direction orthogonal to the extending direction of the holder. Therefore, when a coolant outlet is provided in the holder, the cutting edge direction of the cutting insert and the coolant discharge direction do not match. As a result, it is difficult to apply the coolant at an appropriate angle, and there is a problem that the cutting heat tends to increase.

[0005] One object of the present invention is to provide an exchangeable cutting edge cutting tool that can appropriately supply coolant to the cutting edge of an L-shaped cutting insert.

Means for Solving the Problems

[0006] According to one aspect of the present invention, there is provided an indexable cutting tool including a holder having an upper jaw portion and a lower jaw portion facing each other, and a cutting insert held between the upper jaw portion and the lower jaw portion. The cutting insert has, in a plan view with a seating surface supported by the lower jaw portion as a lower surface, a rod-shaped main body portion, and a rod-shaped cutting edge portion connected to the main body portion via a bent portion and extending in a direction intersecting the main body portion. The holder includes a coolant discharge port that opens on the surface of the upper jaw portion and discharges coolant, and a flow path attachment having an internal flow path that guides the coolant discharged from the coolant discharge port to the cutting edge of the cutting insert.

[0007] In the indexable cutting tool having the above configuration, since the holder is provided with the flow path attachment, the coolant discharged from the coolant discharge port is discharged from the flow path attachment through the internal flow path of the flow path attachment. The coolant discharged from the flow path attachment is supplied to the cutting edge. Thereby, the ratio of the coolant that effectively acts on the cooling of the cutting insert can be increased, so that the temperature rise of the cutting insert can be suppressed. Abnormal damage of the cutting insert can be suppressed.

[0008] The cutting insert may have a cutting edge at the tip of the cutting edge portion on the side opposite to the bent portion, and the flow path attachment may be configured to discharge the coolant in a direction orthogonal to the direction in which the cutting edge extends.

[0009] The flow path attachment may be configured to discharge the coolant along the length direction of the cutting edge portion.

[0010] The internal flow path of the flow path attachment may be a bent flow path extending along the bent shape of the cutting insert.

[0011] The flow path attachment may be configured to have a pair of side walls facing each other with the upper jaw portion interposed therebetween.

[0012] The holder has an insert clamping screw for adjusting the distance between the upper jaw portion and the lower jaw portion, and the flow path attachment may be configured to be fixed to the holder by the insert clamping screw.

Advantages of the Invention

[0013] According to one aspect of the present invention, there is provided an indexable cutting tool capable of appropriately supplying coolant to the cutting edge of an L-shaped cutting insert.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

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Figure 11

Embodiments for Carrying Out the Invention

[0015] FIG. 1 is a partial perspective view of the cutting tool with replaceable cutting edges according to the embodiment. FIG. 2 is a view showing the cutting tool with replaceable cutting edges with the flow path attachment removed. FIG. 3 is a longitudinal sectional view of the tip portion of the cutting tool with replaceable cutting edges, cut at the center in the width direction of the modular blade.

[0016] The cutting tool 100 with replaceable cutting edges shown in FIG. 1 includes a holder 1 and a cutting insert 10. The holder 1 includes a rod-shaped holder body 2, a modular blade 3 fixed to the tip of the holder body 2, and a flow path attachment 30 fixed to the upper part of the modular blade 3. The holder body 2 and the modular blade 3 are made of, for example, steel.

[0017] In the present embodiment, in the longitudinal direction of the holder 1, the side where the cutting insert 10 is attached is referred to as the tip side, and the base end side of the holder body 2 on the side opposite to the cutting insert 10 is referred to as the rear end side. Also, the vertical direction in the following description refers to the vertical direction in FIG. 1.

[0018] As shown in FIG. 2, the holder body 2 has a square prism-shaped shank portion 2a and a blade attachment portion 2b located at the tip of the shank portion 2a. The blade attachment portion 2b has screw holes for fixing the modular blade 3 on the upper surface, the tip surface, and the side surface.

[0019] The modular blade 3 has a plate-like portion 3f that partially protrudes from one side surface of the modular blade 3 (the surface facing the blade attachment portion 2b). As shown in FIGS. 1 and 2, the modular blade 3 is fixed to the blade attachment portion 2b of the holder body 2 by two modular blade clamp screws 23 passing through the rear end portion of the modular blade 3 and two modular blade clamp screws 24 passing through the plate-like portion 3f. The four modular blade clamp screws 23 and 24 are tightened into the screw holes provided in the blade attachment portion 2b of the holder body 2.

[0020] As shown in Fig. 2, the modular blade 3 has a slit 3a extending from the tip to the rear end side of the modular blade 3. Among the modular blade 3, the portion above the slit 3a is the upper jaw portion 3b, and the portion below the slit 3a is the lower jaw portion 3c. The connecting portion 3d between the upper jaw portion 3b and the lower jaw portion 3c is thin, and the upper jaw portion 3b can be deformed so as to bend toward the lower jaw portion 3c side with the connecting portion 3d as a fulcrum.

[0021] As shown in Figs. 2 and 3, the lower jaw portion 3c has a pedestal portion 4 at the tip of the lower jaw portion 3c. On the upper surface of the pedestal portion 4, a pedestal surface 5 formed of a flat surface having a rectangular shape in plan view is formed. The pedestal surface 5 extends from the tip of the lower jaw portion 3c to the middle of the slit 3a in the longitudinal direction of the modular blade 3.

[0022] The upper jaw portion 3b has a pressing portion 6 at the tip of the upper jaw portion 3b. The pressing portion 6 is a triangular plate-shaped side view that tapers toward the tip side. The tip of the pressing portion 6 is located on the rear end side of the tip of the lower jaw portion 3c. A pressing surface 7 is formed on the surface of the pressing portion 6 facing the pedestal portion 4 side. The pressing surface 7 extends from the tip of the upper jaw portion 3b to the middle of the slit 3a.

[0023] In the holder 1, the pedestal surface 5 of the pedestal portion 4 and the pressing surface 7 of the pressing portion 6 are arranged to face each other in the vertical direction. In the holder 1, the pedestal portion 4 and the pressing portion 6 constitute an insert mounting seat 8.

[0024] A clamp portion 3e is provided on the upper part of the modular blade 3. The clamp portion 3e constitutes a part of the clamping means of the insert mounting seat 8 of the holder 1. The clamp portion 3e constitutes a part of the countersunk hole and has a seat surface of the insert clamp screw 22 that is tightened into the screw hole of the blade mounting portion 2b. By pushing the upper jaw portion 3b downward with the insert clamp screw 22, the cutting insert 10 inserted between the upper jaw portion 3b and the lower jaw portion 3c can be fixed.

[0025] The cutting insert 10 is clamped and fixed in the vertical direction by the pedestal portion 4 and the pressing portion 6 of the insert mounting seat 8. The cutting insert 10 is made of, for example, cemented carbide. As shown in Fig. 2, the cutting insert 10 is a cutting insert having a shape bent in an L shape in plan view. The cutting insert 10 has a bent portion 13, a rod-shaped main body portion 12 extending from the bent portion 13 along the slit 3a, and a rod-shaped cutting edge portion 16 extending in a direction orthogonal to the main body portion 12 with the bent portion 13 as a base point. In the present embodiment, the main body portion 12, the bent portion 13, and the cutting edge portion 16 are parts of the single-member cutting insert 10. The cutting insert 10 is L-shaped and bent at 90° at the bent portion 13. The bending angle of the cutting insert 10 is not limited to 90°, and can be any angle of 1° or more and 90° or less.

[0026] As shown in Fig. 3, the upper surface of the cutting insert 10 is the surface 14 to be pressed facing the pressing surface 7 of the pressing portion 6. In the case of the present embodiment, the upper surface of the main body portion 12 is the surface 14 to be pressed. The lower surface of the cutting insert 10 is the seating surface 15 facing the pedestal surface 5 of the pedestal portion 4. In the case of the present embodiment, the lower surface of the main body portion 12 and the lower surface of the bent portion 13 constitute the seating surface 15.

[0027] As shown in Fig. 2, cutting edges 17 are formed on three sides of the upper surface end of the cutting edge portion 16 extending in a direction orthogonal to the main body portion 12. The cutting edges 17 are formed on a side extending in a direction substantially orthogonal to the direction in which the cutting edge portion 16 extends at the tip portion of the upper surface of the cutting edge portion 16, and two sides extending along the direction in which the cutting edge portion 16 extends adjacent to this side. The side surface of the cutting edge portion 16 continuous with the cutting edge 17 is the relief surface 18 of the cutting edge 17. The upper surface portion of the cutting edge portion 16 continuous with the cutting edge 17 is the rake surface 19. In the present embodiment, the rake surface 19 is trapezoidal and widens toward the tip of the cutting edge portion 16 in plan view.

[0028] From the end of the scoop surface 19 on the main body part 12 side toward the bending part 13, a concave groove 11 with a substantially V-shaped cross-section extends. The concave groove 11 extends from the upper surface of the cutting edge part 16, passes through the upper surface of the bending part 13, and extends to the upper surface of the main body part 12, reaching the end of the main body part 12 on the side opposite to the bending part 13. The concave groove 11 extends linearly along the direction in which the cutting edge part 16 extends on the cutting edge part 16. The concave groove 11 bends in an arc shape on the bending part 13 and changes its direction toward the main body part 12 side. The concave groove 11 extends linearly along the direction in which the main body part 12 extends on the main body part 12.

[0029] As shown in FIGS. 2 and 3, the upper jaw part 3b of the modular blade 3 has a coolant discharge port 9 that opens toward the tip side on the upper surface of the tip part of the pressing part 6. The coolant discharge port 9 is connected to a coolant flow path 9a formed inside the modular blade 3. The other end of the coolant flow path 9a is connected to a coolant supply port 9b. The coolant supply port 9b is connected to a coolant flow path (not shown) of the holder main body 2. Coolant is supplied to the modular blade 3 through the coolant supply port 9b, and the supplied coolant is discharged from the coolant discharge port 9 in the tip direction of the modular blade 3 via the coolant flow path 9a.

[0030] As shown in FIGS. 1 and 3, a flow path attachment 30 is mounted on the upper jaw part 3b of the modular blade 3. FIG. 4 is a perspective view of the flow path attachment 30. FIG. 5 is a plan view of the flow path attachment 30 as viewed from above. FIG. 6 is a plan view of the flow path attachment 30 as viewed from below.

[0031] As shown in FIGS. 3 to 6, the flow path attachment 30 has an internal flow path 31 for guiding coolant inside it. The flow path attachment 30 has a longitudinal shape along the direction in which the slit 3a of the modular blade 3 extends. In a state where the flow path attachment 30 is mounted on the modular blade 3, the direction toward the tip of the holder 1 is defined as the tip side of the flow path attachment 30, and the direction toward the rear end of the holder 1 is defined as the rear end side of the flow path attachment 30.

[0032] The flow path attachment 30 includes a flow path forming portion 32 having an internal flow path 31, two side walls 33, 34 extending rearward from the rear end portion of the flow path forming portion 32, a top wall 35 connecting the upper end portions of the two side walls 33, 34, and a fixing portion 36 extending laterally from the rear end portion of the top wall 35.

[0033] The flow path forming portion 32 has a main body portion 32a extending along the longitudinal direction of the flow path attachment 30 and a discharge portion 32b protruding laterally from the tip portion of the main body portion 32a. As shown in FIG. 5, the internal flow path 31 extends along the extending direction of the main body portion 32a inside the main body portion 32a. The internal flow path 31 bends laterally at the tip portion of the main body portion 32a and opens at the tip of the discharge portion 32b through the discharge portion 32b. The opening at the tip of the discharge portion 32b is the discharge port 31a of the internal flow path 31, and the opening at the rear end face of the main body portion 32a is the supply port 31b of the internal flow path 31.

[0034] Also, as shown in FIG. 6, the bottom surface 32c of the flow path forming portion 32 is located at the tip portion of the flow path forming portion 32 and extends in a direction orthogonal to the vertical direction. The surface facing the rear end side of the flow path forming portion 32 is an inclined surface portion 32d extending rearward from the rear end of the bottom surface 32c. The inclined surface portion 32d is an inclined surface that slopes upward toward the rear end side. The supply port 31b of the internal flow path 31 opens in the inclined surface portion 32d. The top wall 35 extends rearward from the rear end (upper end) of the inclined surface portion 32d.

[0035] The two side walls 33, 34 are plate-like portions extending along the side surfaces of the flow path forming portion 32. The side walls 33, 34 extend rearward from the edges of the inclined surface portion 32d of the flow path forming portion 32. The top wall 35 is a plate-like portion bridged between the upper ends of the side walls 33, 34. The fixing portion 36 has a fixing seat portion 36a having an arcuate shape in plan view and a connecting portion 36b having a curved surface shape connecting the fixing seat portion 36a and the top wall 35.

[0036] The flow path attachment 30 is mounted so as to cover the upper jaw portion 3b of the modular blade 3 from above. In the mounted state, the bottom surface 32c of the flow path forming portion 32 of the flow path attachment 30 is disposed on the upper surface of the cutting insert 10. The inclined surface 32d of the flow path forming portion 32 is disposed along the upper surface of the pressing portion 6. The supply port 31b that opens to the inclined surface 32d of the flow path forming portion 32 is disposed to face the coolant discharge port 9 that opens to the tip of the pressing portion 6. Thereby, the coolant flow path 9a of the modular blade 3 and the internal flow path 31 of the flow path attachment 30 are connected. The tip of the flow path forming portion 32 is disposed on the bent portion 13 of the cutting insert 10. The discharge portion 32b protruding from the flow path forming portion 32 is disposed on the cutting edge portion 16 with the discharge port 31a at the tip of the discharge portion 32b facing the cutting edge 17.

[0037] The two side walls 33, 34 are disposed so as to sandwich the upper jaw portion 3b from both sides in the width direction. The top wall 35 is disposed so as to cover the upper surface of the upper jaw portion 3b. By sandwiching the upper jaw portion 3b with the side walls 33, 34, the flow path attachment 30 can be stably mounted. Also, the supply port 31b of the internal flow path 31 and the coolant discharge port 9 can be aligned. Note that the flow path attachment 30 may be configured not to include one or both of the side walls 33, 34. By adopting such a configuration, a flow path attachment that can be mounted on a plurality of types of modular blades having different widths of the upper jaw portion 3b can be obtained.

[0038] The fixing portion 36 is connected to the rear end portion of the top wall 35. The fixing portion 36 is a portion for fixing the flow path attachment 30 to the modular blade 3. Here, FIG. 7 is a partial perspective view for explaining a fixing method of the flow path attachment 30. As shown in FIG. 7, the fixing portion 36 is disposed in the clamp portion 3e of the modular blade 3. The clamp portion 3e constitutes a countersunk hole together with the screw hole 2c provided in the blade mounting portion 2b of the holder body 2. The fixing seat portion 36a of the fixing portion 36 is disposed on the seat surface of the clamp portion 3e. The connecting portion 36b of the fixing portion 36 is disposed along the inner peripheral surface of the clamp portion 3e.

[0039] With the fixing part 36 disposed in the clamping part 3e, the insert clamping screw 22 is tightened into the screw hole 2c of the holder body 2, so that the fixing seat part 36a is sandwiched and fixed between the head of the insert clamping screw 22 and the seating surface of the clamping part 3e. Thereby, the flow path attachment 30 is fixed to the modular blade 3. Since the flow path attachment 30 is fixed using the insert clamping screw 22, the flow path attachment 30 can be attached without increasing the number of parts.

[0040] The flow path attachment 30 is made of metal, resin, or the like. The flow path attachment 30 is preferably manufactured using a layered manufacturing method. According to the layered manufacturing method, an internal flow path 31 of an arbitrary shape can be formed, and coolant can be accurately supplied to the cutting edge 17 of the cutting insert 10.

[0041] In the cutting tool 100 with replaceable cutting edges of the present embodiment having the above configuration, since the flow path attachment 30 is provided on the holder 1, the coolant discharged from the coolant discharge port 9 passes through the internal flow path 31 of the flow path attachment 30 and is discharged from the discharge part 32b of the flow path attachment 30. Since the discharge part 32b faces the direction in which the cutting edge part 16 of the cutting insert 10 extends, the coolant discharged from the discharge part 32b is discharged toward the cutting edge 17 located at the tip of the cutting edge part 16.

[0042] In the present embodiment, the coolant discharged from the flow path attachment 30 is supplied to the cutting edge 17 at the tip of the cutting edge part 16 from the rake face 19 side. For the cutting edge portion of the cutting edge 17 that extends in a direction orthogonal to the direction in which the cutting edge part 16 extends, the coolant is supplied from a direction substantially orthogonal thereto. Thereby, the ratio of the coolant that effectively acts on the cooling of the cutting insert 10 can be increased, so that the temperature rise of the cutting insert 10 can be suppressed. Abnormal damage to the cutting insert 10 can be suppressed.

[0043] In addition, since the flow path attachment 30 can be designed according to an existing holder, it is not necessary to change the shape of the holder, and the cooling efficiency of the cutting insert 10 can be increased while suppressing cost increase.

[0044] In the present embodiment, the internal flow path 31 of the flow path attachment 30 is a bent flow path extending along the bent shape of the cutting insert 10. According to this configuration, the flow path attachment 30 can be arranged on the cutting insert 10, and the internal flow path 31 can be arranged along the cutting insert 10. It is easy to arrange the flow path attachment 30 so as not to protrude outward, and interference between the flow path attachment 30 and the workpiece can be suppressed.

[0045] In the above embodiment, the configuration in which the flow path attachment 30 is fixed using the insert clamp screw 22 has been described, but the present invention is not limited to this configuration. FIG. 8 and FIG. 9 are diagrams showing other examples of the fixing structure of the flow path attachment 30. As shown in FIG. 8, a clamp screw 25 may be provided at the inclined surface portion at the rear of the flow path forming portion 32 of the flow path forming portion 32 of the flow path attachment 30. The clamp screw 25 passes through the inclined surface portion of the flow path forming portion 32 and is tightened into the screw hole of the inclined surface portion of the modular blade 3 (pressing portion 6). As shown in FIG. 9, a clamp screw 26 may be provided on the side wall 33 of the flow path attachment 30. The clamp screw 26 passes through the side wall 33 and is tightened into the screw hole on the side surface of the modular blade 3.

[0046] In addition, the shapes of the discharge port 31a and the supply port 31b of the internal flow path 31 in the flow path attachment 30 are not limited to the shapes of the above embodiment. The opening shapes of the discharge port 31a and the supply port 31b can be various shapes such as circular, square, and triangular.

[0047] FIG. 10 is a diagram showing other examples of the shapes of the discharge port and the supply port of the internal flow path. In the above-described embodiment, the configurations of the discharge port 31a in Fig. 10(A) and the supply port 31b in Fig. 10(a) are used, and they are circular openings when viewed from the front. In contrast, it is also possible to adopt a configuration including a discharge port 131a shown in Fig. 10(B) and a supply port 131b shown in Fig. 10(b).

[0048] The discharge port 131a shown in Fig. 10(B) is a flat trapezoidal opening, and the tip of the main body 32a can be formed thinner compared to the circular discharge port 31a shown in Fig. 10(A). Thereby, the protruding height from the cutting insert 10 of the flow path attachment 30 can be suppressed, and a configuration less likely to interfere with the workpiece can be achieved.

[0049] The supply port 131b shown in Fig. 10(b) is an opening having a shape close to a square, and the opening area can be made larger than that of the circular supply port 31b shown in Fig. 10(a). Thereby, it is easy to align the supply port 131b with the coolant discharge port 9 of the modular blade 3. The flow path attachment 30 can be configured not to be provided with one or both of the side walls 33 and 34, and can be attachable to a plurality of types of modular blades 3 having different widths. When the width of the modular blade 3 changes, the position of the coolant discharge port 9 also shifts slightly. Therefore, it is effective to use the flow path attachment 30 provided with the supply port 131b having a large opening area shown in Fig. 10(b).

[0050] In the above-described embodiment, the holder 1 is exemplified as having a configuration in which the holder body 2 and the modular blade 3 are separate bodies, but the present invention is not limited to this configuration. The cutting tool with replaceable cutting edge may have a configuration including a holder in which the holder body and the modular blade are integrated.

[0051] Fig. 11 is a perspective view of a cutting tool with replaceable cutting edge including an integral holder. In Fig. 11, the same reference numerals are given to the components common to Figs. 1 to 10, and detailed descriptions thereof are omitted. The cutting tool 100A with replaceable cutting edges shown in Fig. 11 is provided with an integral holder 1A. The holder 1A has a rod-shaped shank portion 2A and a head portion 3A located at the tip of the shank portion 2A in the longitudinal direction. The head portion 3A has an upper jaw portion 3b and a lower jaw portion 3c. An L-shaped cutting insert 10 is held in an insert mounting seat 8 provided between the upper jaw portion 3b and the lower jaw portion 3c. Similar to the previous embodiment, the flow path attachment 30 can be attached to the upper jaw portion 3b of the head portion 3A and fixed to the head portion 3A by an insert clamp screw 22.

Explanation of Reference Numerals

[0052] 1, 1A... Holder 2... Holder body 2a, 2A... Shank portion 2b... Blade mounting portion 2c... Screw hole 3... Modular blade 3a... Slit 3b... Upper jaw portion 3c... Lower jaw portion 3d... Connection portion 3e... Clamp portion 3f... Plate-like portion 3A... Head portion 4... Pedestal portion 5... Pedestal surface 6... Pressing portion 7... Pressing surface 8... Insert mounting seat 9... Coolant discharge port 9a... Coolant flow path 9b... Coolant supply port 10... Cutting insert 11... Concave groove 12... Body portion 13... Bent portion 14... Surface to be pressed 15... Seating surface 16... Cutting edge portion 17... Cutting edge 18... Relief surface 19... Rake surface 22... Insert clamp screw 23, 24… modular blade clamp screw 25, 26… clamp screw 30… flow path attachment 31… internal flow path 31a… discharge port 31b… supply port 32… flow path forming part 32a… main body part 32b… discharge part 32c… bottom surface 32d… inclined surface part 33, 34… side wall 35… top wall 36… fixing part 36a… fixing seat part 36b… connection part 100, 100A… tip-exchangeable cutting tool

Claims

1. A cutting tool with replaceable cutting edges, comprising a holder having an upper jaw and a lower jaw facing each other, and a cutting insert held between the upper jaw and the lower jaw, In a plan view with the seating surface supported by the lower jaw as the lower surface, the cutting insert has a rod-shaped main body portion and a rod-shaped cutting edge portion connected to the main body portion via a bent portion and extending in a direction intersecting the main body portion, The holder is, A coolant discharge port that opens on the surface of the upper jaw and discharges coolant, A flow path attachment having an internal flow path for guiding the coolant discharged from the coolant discharge port to the cutting edge of the cutting insert, Comprising, Cutting tool with replaceable cutting edges.

2. The cutting insert has a cutting edge at the tip of the cutting edge portion opposite to the bent portion, The flow path attachment discharges the coolant in a direction orthogonal to the direction in which the cutting edge extends, The cutting tool with replaceable cutting edges according to Claim 1.

3. The flow path attachment discharges the coolant along the length direction of the cutting edge portion, The cutting tool with replaceable cutting edges according to Claim 1 or 2.

4. The internal flow path of the flow path attachment is a bent flow path extending along the bent shape of the cutting insert, The cutting tool with replaceable cutting edges according to Claim 1 or 2.

5. The flow path attachment has a pair of side walls facing each other with the upper jaw interposed therebetween, The cutting tool with replaceable cutting edges according to Claim 1 or 2.

6. The holder has an insert clamping screw for adjusting the distance between the upper jaw and the lower jaw, The flow path attachment is fixed to the holder by the insert clamping screw, The cutting tool with replaceable cutting edges according to Claim 1 or 2.

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