Cutting tool and its cartridge, toolholder

Abstract

Provided are a cutting tool, a cartridge thereof, and a toolholder that enable an increase in the number of available corners. 【Solution means】The cutting tool 1 includes a cartridge 30 having at least two insert seats 31 capable of mounting cutting inserts 50 of the same shape in different postures, and a cartridge mounting seat 11 provided on the body 10 capable of mounting the cartridge 30 in different postures. When the cartridge 30 is mounted on the cartridge mounting seat 11, any one of the insert seats 31 holds the cutting insert 50 so that the cutting insert 50 is placed flat on the body 10, and any one of the other insert seats 31 holds the cutting insert 50 so that the cutting insert 50 is placed vertically on the body 10.

Description

Technical Field

[0001] The present invention relates to a cutting tool, its cartridge, and a tool holder.

Background Art

[0002] In a cutting tool used for drilling or boring, when chamfering is performed simultaneously with cutting, a cutting edge (chamfering edge) for performing chamfering may be arranged according to the chamfering shape. When arranging such a cutting edge for chamfering, generally, cutting inserts such as rhombus, triangle, and square are often used in a flat position. In addition, there has been proposed a cutting tool that can use cutting inserts having different shapes with one cutting tool (see Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, one of the problems in the conventional cutting tools as described above is that it is difficult to increase the number of available corners of the cutting insert, that is, the number of available cutting edges. For example, focusing on the cutting insert itself arranged as a cutting edge for chamfering as described above, it is generally impossible to use a corner exceeding the number of sides of the cutting insert. That is, if the cutting insert is a positive-shaped triangle, a maximum of 3 sides can be used, if it is a square, a maximum of 4 sides can be used, and if it is a rhombus or a parallelogram, a maximum of 2 sides can be used. Therefore, the number of uses of each cutting insert is at most 3 times, 4 times, and 2 times, respectively.

[0005] Therefore, an object of the present invention is to provide a cutting tool, a cartridge thereof, and a tool holder that enable an increase in the number of available corners.

Means for Solving the Problem

[0006] One aspect of the present invention is a cartridge for a cutting tool, the cartridge including at least two insert seats capable of mounting cutting inserts of the same shape in different postures.

[0007] According to a cartridge including at least two insert seats as described above, it is possible to mount cutting inserts of the same shape in different postures. By mounting a cutting insert on any of the insert seats of the cartridge in a posture that allows machining at a corner that has not been used conventionally, unused cutting edges of the same insert can be used, and thus the number of available corners can be increased.

[0008] In the cartridge as described above, female screw portions into which mounting screws for attaching the cutting insert to the insert seat of the cartridge are screwed may be provided in each of the insert seats.

[0009] In the cartridge as described above, the plurality of female screw portions may have a twisted positional relationship with respect to the central axes of the female screw portions.

[0010] In the cartridge as described above, a mounting hole into which a mounting screw for attaching the cartridge to the body of the cutting tool is inserted may be provided at approximately the center of the cartridge.

[0011] In the cartridge as described above, the mounting hole may be provided so as to extend in a direction parallel to any of the central axes of the female screw portions.

[0012] In the cartridge as described above, the mounting holes may be provided so as to be in a twisted positional relationship with respect to any of the central axes of the female screw portions.

[0013] Another aspect of the present invention is a cutting tool having a cutting insert and a body, a cartridge including at least two insert seats capable of mounting cutting inserts of the same shape in different postures, and a cartridge mounting seat provided on the body, capable of mounting the cartridge in different postures.

[0014] In the cartridge in the cutting tool as described above, when the cartridge is mounted on the cartridge mounting seat of the body, any one of the insert seats holds the cutting insert so that the cutting insert is placed flat on the body, and any one of the other insert seats may have a shape that holds the cutting insert so that the cutting insert is placed vertically on the body.

[0015] In the cutting tool as described above, female screw portions into which mounting screws for attaching the cutting insert to the insert seats of the cartridge are screwed may be provided in each of the insert seats.

[0016] The cartridge in the cutting tool as described above may have a shape having two abutting surfaces that can abut against the seat surface of the cartridge mounting seat and are parallel to each other.

[0017] In the cutting tool as described above, the cartridge mounting seat may have a seat surface and a wall surface perpendicular to the seat surface.

[0018] In the cutting tool as described above, a mounting hole into which a mounting screw for attaching to the body is inserted may be provided at approximately the center of the cartridge.

[0019] In the cutting tool as described above, the mounting hole may be provided perpendicular to the abutting surface.

[0020] In the cutting tool as described above, the mounting hole may be provided so as to extend obliquely with respect to the tangential direction of a virtual circle centered on the central axis of the body.

[0021] The cutting tool as described above may be provided such that when the cartridge is re-mounted in a different posture, the cutting edges of the cutting inserts substantially overlap.

[0022] The cutting tool as described above may be provided such that when the cartridge is re-mounted in a different posture, the cutting edges of the cutting inserts do not overlap.

[0023] The cutting tool as described above may have two insert seats and be such that the cartridge can be rotated 180° and attached to the cartridge mounting seat with its orientation changed.

[0024] Yet another aspect of the present invention is a toolholder for a cutting tool that holds a cutting insert, the toolholder comprising at least two insert mounting portions on which cutting inserts of the same shape can be mounted in different postures.

[0025] Also, the cutting tool may be one that includes the toolholder as described above.

Brief Description of the Drawings

[0026]

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[0027] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0028] [First Embodiment] The cutting tool 1 is a tool used for drilling and boring, and has a body 10, a cartridge mounting seat 11, a seat surface 15, a wall surface 16, a drill head 18, etc. (see FIG. 1 etc.). The drill head 18 attached to the tip of the body 10 cuts the workpiece 100 while rotating around the central axis X of the body 10 to perform machining such as drilling and boring.

[0029] The cartridge mounting seat 11 is a seat for mounting the cartridge 30, and is provided on the side portion of the body 10 (see FIG. 1 etc.). The cartridge mounting seat 11 of the present embodiment has a shape having a seat surface 15 and a wall surface 16 perpendicular to this seat surface 15.

[0030] The cartridge 30 is a cartridge capable of mounting two plate-shaped cutting inserts 50 having the same shape. (See Fig. 1 etc.). The cartridge 30 is mounted on the cartridge mounting seat 11 of the body 10 and is used for chamfering at the same time as cutting the workpiece 100. (See Fig. 2 etc.). The cartridge 30 of the present embodiment can be removed from the cartridge mounting seat 11, inverted around the central axis 30C, and then remounted on the cartridge mounting seat 11 to change the posture, whereby the cutting insert 50 used for chamfering can be replaced. (See Fig. 6 etc.).

[0031] The cartridge 30 includes two insert seats 31 on which cutting inserts 50 having the same shape can be mounted in different postures. (See Figs. 5 to 8). Although there can be various modes for the different postures mentioned here, in the cartridge 30 of the present embodiment, when the cartridge 30 is mounted on the cartridge mounting seat 11 of the body 10, one insert seat 31 (31h) holds the cutting insert 50 so that the cutting insert 50 is placed flat on the body 10, and the other insert seat 31 (31t) has a shape that holds each cutting insert 50 so that the cutting insert 50 is placed vertically on the body 10. (See Fig. 6 etc.).

[0032] Now, although the terms "horizontal placement" and "vertical placement" are used in a general sense in this specification, if we were to explain them in detail, it would be as follows. That is, "horizontal placement" refers to the mode of attachment in which, when the cutting insert 50 is provided with an insert mounting hole 53 for the insert mounting screw 60, the mounting hole 53 and the central axis 53A of the insert mounting screw 60 face the circumferential direction (rotating direction) of the body 10, or the mode of attachment in which the cutting insert 50, which is plate-shaped and has a thickness thinner than the length of each side, is attached in a state where its thickness direction faces the circumferential direction (rotating direction) of the body 10 (see FIGS. 1 to 4, FIG. 5(A), FIG. 6(A), FIG. 7(A)). "Vertical placement" refers to the mode of attachment in which, when the cutting insert 50 is provided with a mounting hole 53 for the insert mounting screw 60, the mounting hole 53 and the central axis of the insert mounting screw 60 are in a direction along the central axis 10X of the body 10 or in a direction along the radial direction of the body 10, or the mode of attachment in which the cutting insert 50, which is plate-shaped and has a thickness thinner than the length of each side, is attached in a state where its thickness direction is in a direction along the central axis 10X of the body 10 or in a direction along the radial direction of the body 10 (see FIGS. 5(B), FIG. 6(B), FIG. 7(B)). Incidentally, although not particularly shown in this embodiment, in the case of the "vertical placement" mode where the cutting insert 50 is attached in a state where the central axis of the mounting hole 53 and the insert mounting screw 60 is in the direction along the radial direction of the body 10, the corner portions of the upper and lower surfaces of the cutting insert 50 are sharpened without being rounded, and the corner portion is formed with a cutting edge as a ridge line extending from the upper surface to the lower surface.

[0033] In addition, the cartridge 30 of this embodiment is provided with an insert seat 31, a female screw portion 32, a cartridge mounting hole 33, and abutting surfaces 35, 36.

[0034] As described above, the insert seat 31 is composed of two insert seats 31h and 31t that can mount the same-shaped cutting inserts 50 in different postures. These two insert seats 31 (31h, 31t) are provided at both longitudinal ends of the cartridge 30 (see FIG. 5 and the like).

[0035] The female screw portion 32 is a portion where an insert mounting screw 60 for attaching the cutting insert 50 to the insert seat 31 of the cartridge 30 is screwed (see FIG. 7(B) etc.). In the case of the present embodiment, the female screw portions 32 of the two insert seats 31 (31h, 31t) are in a twisted positional relationship with respect to the central axes of the female screw portions. More specifically, the female screw portion 32 of the insert seat 31h formed so that the cutting insert 50 is placed flat on the body 10 is composed of a hole substantially parallel to the cartridge mounting hole 33 (see FIGS. 5 to 8). On the other hand, the female screw portion of the insert seat 31t formed so that the cutting insert 50 is placed vertically on the body 10 is composed of a hole in a vertical or twisted positional relationship with respect to the cartridge mounting hole 33, and is provided at a position where it cannot be seen hidden in FIGS. 5 to 8.

[0036] The cartridge mounting hole 33 is a hole into which a cartridge mounting screw 40 for attaching the cartridge 30 to the body 10 is inserted (see FIGS. 5 to 7). In the present embodiment, the cartridge mounting hole 33 is arranged at a position substantially at the center in the longitudinal direction of the cartridge 30. In such a case, when the cartridge 30 is once removed, reattached after changing the posture, and the cutting insert 50 used for chamfering is changed from one to the other, the positions of the cutting edges 51 of these cutting inserts 50 will substantially overlap. The cartridge mounting hole 33 may be a simple through-hole or may have an internal thread provided on its inner circumference. In the latter case (when an internal thread is provided on the inner circumference), the cartridge 30 can be attached to the cartridge mounting seat 11 by screwing the male thread of the cartridge mounting screw 40 inserted from the back side of the cartridge mounting seat 11 into this female thread (see FIG. 1). The cartridge mounting hole 33 extends in a direction parallel to the central axis of the female screw portion 32 of the insert seat 31h formed so that the cutting insert 50 is placed flat on the body 10.

[0037] The contact surface 35 is composed of two surfaces that can contact the seating surface 15 of the cartridge mounting seat 11 and are parallel to each other. Specifically, what corresponds to such a contact surface 35 is the upper surface or the lower surface (both are indicated by reference numeral 35 in the drawing) provided with an opening of any one of the cartridge mounting holes 33 (see FIG. 6 etc.). In the present embodiment, the above-described cartridge mounting hole 33 is provided perpendicular to this contact surface (upper surface or lower surface) 35.

[0038] The contact surface 36 is a surface that contacts the wall surface 16 of the cartridge mounting seat 11 among the side surfaces formed between the upper surface 35 and the lower surface 35 (see FIG. 2 etc.). The contact surface 36 is perpendicular to the contact surface 35 composed of the upper surface or the lower surface.

[0039] As described above, the cartridge 30 of the present embodiment can change its posture by rotating (inverting) 180° about a predetermined axis, and thereby can replace the cutting insert 50 used for chamfering from one side to the other. The predetermined axis mentioned here is the central axis 30C. In the present embodiment, the cartridge 30 is inverted 180° about this central axis 30C perpendicular to the central axis of the cartridge mounting hole 33, and the upper surface 35 and the lower surface 35 are turned over so that the posture can be changed (see FIG. 6 etc.).

[0040] According to the cartridge 30 or the cutting tool 1 provided with the same as in the present embodiment, it is possible to mount two cutting inserts 50 having the same shape in different postures. That is, by mounting the cutting insert 50 in a posture that can be processed with the corner cutting edge 51 that has not been used conventionally on any one of the insert seats 31 of the cartridge 30, the unused cutting edge 51 of the same cutting insert 50 can be used, and thus the number of available corners can be increased. The details of this will be described as follows (see FIGS. 3, 4, etc.).

[0041] First, looking at the conventional cutting tools, the cutting insert 50 used for chamfering during the cutting process of the workpiece 100 (see Fig. 2), if it is a positive triangular shape, the cutting edge 51 can be replaced by rotating it by 120° each time, allowing for a maximum of 3 sides to be used; if it is a square shape, the cutting edge 51 can be replaced by rotating it by 90° each time, allowing for a maximum of 4 sides to be used (see Fig. 4); if it is a rhombus or parallelogram shape, the cutting edge 51 can be replaced by rotating it by 180°, but only a maximum of 2 sides can be used (see Fig. 3). Therefore, as described above, the maximum number of times each cutting insert 50 can be used is 3 times, 4 times, and 2 times respectively. (In Figs. 3, 4, and further Fig. 5, etc., the parts that can be used as cutting edges are shown in bold lines).

[0042] In contrast, in this embodiment, a cartridge 30 equipped with a horizontal insert seat 31h and a vertical insert seat 31t is used, and by properly using each insert seat 31h, 31t, it becomes possible to use cutting edges that were not usable in the past. That is, for example, when the cutting insert 50 is a rhombus shape, conventionally, in the horizontal placement state, only a maximum of 2 sides could be used (see Figs. 3 and 5(A)), but by further placing it in the vertical state, it becomes possible to use the remaining 2 sides as the cutting edge 51 as well (see Figs. 5(B) and 6). By doing so, by using the ridge lines that are usually not used as cutting edges of the cutting insert 50 as the cutting edge 51, the number of times each cutting insert 50 can be used can be increased.

[0043] Also, when the cutting insert 50 is, for example, a regular square, conventionally, only a maximum of four places could be used in the flat state (see FIG. 4). By further placing it vertically, it becomes possible to use a further four places, for a total of eight places, as the cutting edge 51 (see FIGS. 7 and 8). It should be noted that the premise of the above description is that the portion used as the cutting edge 51 is less than half of the total length of the cutting edge 51. That is, if the region less than half of the total length of the cutting edge 51 is used in the flat state, by using the remaining region in the vertical state, the portions that can be used as the cutting edge 51 can be effectively utilized evenly. This applies when the cutting insert 50 is a regular polygon such as an equilateral triangle or a regular pentagon.

[0044] [Second Embodiment] In the cartridge 30 of the present embodiment or the cutting tool 1 provided therewith, the cartridge mounting hole 33 of the cartridge 30 is provided so as to extend obliquely with respect to the tangential direction of a virtual circle centered on the central axis 10X of the body 10 (see FIGS. 9 to 12). That is, in the first embodiment described above, the cartridge mounting hole 33 was a hole perpendicular to the upper and lower surfaces 35 of the cartridge 30. In other words, it was formed as a hole extending along the tangential direction of a virtual circle centered on the central axis 10X of the body 10. In contrast, the cartridge mounting hole 33 in the present embodiment is formed as a hole extending in an oblique direction (for example, a 45° direction) with respect to the upper and lower surfaces 35.

[0045] By adopting such a cartridge 30, a component force is generated in the clamping force of the cartridge 30, making it possible to clamp the cartridge 30 in a more suitable state. That is, in the first embodiment described above, the fastening force of the cartridge mounting screw 40 was applied perpendicular to the seating surface 15 of the cartridge mounting seat 11 (see FIGS. 13 and 14). In contrast, in the present embodiment, by applying the component force of the fastening force of the cartridge mounting screw 40 to both the seating surface 15 and the wall surface 16, it becomes possible to clamp two surfaces of the outer peripheral surface of the cartridge 30 in a state where they are in contact with and pressed by both the seating surface 15 and the wall surface 16 (see FIGS. 15 and 16).

[0046] As an example of such a structure, in the present embodiment, a threaded hole inclined at 45° with respect to both the seat surface 15 and the wall surface 16 is provided, and in accordance with this, the cartridge mounting hole 33 of the cartridge 30 is inclined at 45° (see FIGS. 10 to 12). The central axis 30C that becomes the rotation center when changing the posture of the cartridge 30 coincides with the central axis of the cartridge mounting hole 33 (see FIGS. 10 to 12). For example, when this cartridge 30 in the flat state is rotated (reversed) 180° around the central axis 30C to change the posture to the vertical state, the contact surface (indicated by reference numeral 37 in FIG. 12) of the cartridge 30 that was in contact with the seat surface 15 in the flat state comes into contact with the wall surface 16 in the vertical state (see FIG. 12).

[0047] [Third Embodiment] It is also possible to arrange the insert seats 31 at three or more positions and vary the cutting edge positions of the cutting inserts 50 to increase the number of available corners. As an example of such a cartridge 30, a cartridge 30 in which the insert seats 31 are arranged at four positions will be described below as the third embodiment (see FIGS. 17 to 19).

[0048] The cartridge 30 in the present embodiment includes a total of four insert seats 31, namely two insert seats 31h for flat placement and two insert seats 31t for vertical placement. The two insert seats 31h for flat placement are arranged on one surface (for example, the upper surface 35) of the cartridge 30 so as to be point-symmetrical about the central axis of the cartridge mounting hole 33 (see FIG. 17 and the like). Further, the two insert seats 31t for vertical placement are arranged on the surface opposite to one surface of the cartridge 30 (for example, the lower surface 35) so as to be point-symmetrical about the central axis of the cartridge mounting hole 33 (see FIG. 17 and the like). These four insert seats 31 (31h, 31t) are arranged at the four corners of the cartridge 30 so as not to interfere with each other.

[0049] When the cartridge 30 is rotated (inverted) by 180° about the central axis of the cartridge mounting hole 33, the cutting insert 50 in the flat placement state (or vertical placement state) is only replaced with another cutting insert 50 in the flat placement state (or vertical placement state), and it remains in the flat placement state (or vertical placement state). On the other hand, when the cartridge 30 is turned over to reverse the upper surface 35 and the lower surface 35, the positions of the insert seat 31h for flat placement and the insert seat 31t for vertical placement are interchanged, and the cutting insert 50 in the flat placement state (or vertical placement state) is replaced with the cutting insert 50 in the vertical placement state (or flat placement state) (see FIGS. 18 and 19).

[0050] According to the cartridge 30 or the cutting tool 1 including the same as in the present embodiment, it is possible to mount two pairs of a total of four cutting inserts 50 having the same shape in two different postures (two are in the flat placement posture and two are in the vertical placement posture). That is, by mounting the cutting insert 50 in a posture that can be machined with the corner cutting edge 51 that has not been used conventionally on any of the insert seats 31 of the cartridge 30, the unused cutting edge 51 of the same cutting insert 50 can be used, and thus the number of available corners can be increased.

[0051] [Fourth Embodiment] The present invention can also be applied to a cutting tool that does not include the cartridge 30 as described so far, for example, a tool holder for a cutting tool that holds the cutting insert 50. Hereinafter, one form of such a tool holder will be described as the fourth embodiment (see FIGS. 20 and 21).

[0052] The tool holder 80 of the present embodiment includes at least two insert mounting portions 81 capable of mounting the cutting inserts 50 having the same shape in different postures. The different postures here refer to the same postures as "flat placement" and "vertical placement" in the above-described embodiments. Correspondingly, the insert mounting portion 81h for flat placement and the insert mounting portion 81t for vertical placement are provided at both ends in the longitudinal direction of the tool holder 80, respectively (see FIGS. 20 and 21).

[0053] By rotating such a byte holder 80 by 180° (inverting), the cutting insert 50 used for machining can be swapped from one side to the other, and at the same time, it can be switched from the flat (vertical) state to the vertical (flat) state. In short, according to such a byte holder 80 or a cutting tool 1 equipped with this, two cutting inserts 50 of the same shape are mounted in different postures, that is, in a posture such that the cutting insert 50 can be machined with the corner cutting edge 51 that has not been used conventionally at any one of the insert mounting portions 81, so that the unused cutting edge 51 of the same cutting insert 50 can be used, and thus the number of available corners can be increased.

[0054] Note that the above-described embodiments are preferred examples of the present invention, but are not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiments, the cartridge 30 having a box shape, a trapezoidal shape, or a substantially rectangular shape has been illustrated and described, but the specific shape of the cartridge 30 is not limited to these. In addition to these, although not particularly illustrated, the cartridge may be, for example, substantially triangular, and one or two flat insert seats 31h and two or one vertical insert seats 31t may be provided at each of the three tops. In such a form, a plurality (three or more) of insert seats 31 are arranged in the cartridge 30, and a structure is adopted in which more cutting inserts 50 can be attached and used regardless of whether they are in the flat or vertical position, so that the number of available corners can be simply increased.

[0055] In the above-described embodiment, the inclination of the cutting edge 51 of the cutting insert 50 is basically the same in the flat state and the vertical state (see FIG. 6 and the like), but it may be different. Although not particularly shown, for example, in either the flat state or the vertical state, the insert seat 31 (31h, 31t) may be provided such that the cutting insert 50 is inclined at a predetermined angle θ (see FIG. 20(A)), for example, 30° or 45°, about the central axis 53A of the insert mounting hole 53.

[0056] In the above-described embodiment, the cartridge mounting hole 33 is arranged at a position substantially at the center in the longitudinal direction of the cartridge 30, so that when the cartridge 30 is rotated (reversed) to switch the cutting insert 50 from one side to the other, the positions of the cutting edges 51 of these cutting inserts 50 substantially overlap. However, different from this, when the cartridge 30 is reinstalled in a different posture, the cutting edges 51 of the cutting insert 50 may be configured not to overlap.

[0057] In the above-described embodiment, for the sake of clarity, the description was given while showing a diagram of the state in which the cutting insert 50 is also mounted on the insert seat 31 on the unused side. However, in actuality, it is not always necessary to always mount on all the insert seats 31, and a dummy chip or the like for preventing the intrusion of chips or the like may be mounted.

Industrial Applicability

[0058] The present invention is suitable for application to a cutting tool, its cartridge, and a tool holder.

Explanation of Reference Numerals

[0059] 1... Cutting tool 10... Body 10X... Central axis 11... Cartridge mounting seat 15... Seat surface 16... Wall surface (perpendicular to the seat surface) 18... Drill head 30... Cartridge 30C... Central axis 31…Insert seat 31h…Insert seat for horizontal placement 31t…Insert seat for vertical placement 32…Female thread part 33…Cartridge mounting hole (mounting hole) 35…Upper surface or lower surface (contact surface) that contacts the seat surface 15 of the cartridge mounting seat 11 36…Side surface (contact surface) that contacts the wall surface 16 of the cartridge mounting seat 11 37…Contact surface 40…Cartridge mounting screw (mounting screw) 50…Cutting insert 51…Cutting edge 53…Insert mounting hole (mounting hole) 53A…Central axis 60…Insert mounting screw (mounting screw) 80…Tool holder 81…Insert mounting part 81h…Insert mounting part for horizontal placement 81t…Insert mounting part for vertical placement 100…Workpiece

Claims

1. A cutting tool having a cutting insert and a body, comprising a cartridge having at least two insert seats capable of mounting the cutting inserts of the same shape in different postures, and a cartridge mounting seat provided on the body, capable of mounting the cartridge in different postures, wherein the cartridge has a shape with two abutting surfaces that can abut against the seat surface of the cartridge mounting seat and are parallel to each other, and a mounting hole for inserting a mounting screw for attaching to the body is provided at approximately the center of the cartridge.

2. When the cartridge is mounted on the cartridge mounting seat of the body, one of the insert seats holds the cutting insert so that the cutting insert is in a state of being laid flat on the body, and one of the other insert seats holds the cutting insert so that the cutting insert is in a state of being placed vertically on the body. The cutting tool according to claim 1, which has a shape for holding.

3. The cutting tool according to claim 1, wherein each of the insert seats is provided with a female screw portion into which a mounting screw for attaching the cutting insert to the insert seat of the cartridge is screwed.

4. The cutting tool according to claim 1, wherein the cartridge mounting seat has the seat surface and a wall surface perpendicular to the seat surface.

5. The cutting tool according to claim 1, wherein the mounting hole is provided perpendicular to the abutting surface.

6. The cutting tool according to claim 1, wherein the mounting hole is provided so as to extend obliquely with respect to the tangential direction of a virtual circle centered on the central axis of the body.

7. The cutting tool according to any one of claims 1 to 6, wherein when the cartridge is remounted in a different posture, the cutting edges of the cutting inserts are provided so as to substantially overlap.

8. The cutting tool according to any one of claims 1 to 6, wherein when the cartridge is remounted in a different posture, the cutting edges of the cutting inserts are provided so as not to overlap.

9. The cutting tool according to any one of claims 1 to 6, wherein there are two insert seats, and the cartridge can be rotated 180° and attached to the cartridge mounting seat with the orientation changed.

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