Cutting tools, their cartridges, and tool holders

Abstract

This invention provides a cutting tool, its cartridge, and a tool holder that enable an increase in the number of usable corners. [Solution] The cutting tool 1 comprises a cartridge 30 having at least two insert seats 31 that can mount cutting inserts 50 of the same shape in different orientations, and a cartridge mounting seat 11 provided on the body 10 that can mount the cartridge 30 in different orientations. When the cartridge 30 is mounted on the cartridge mounting seat 11, one of the insert seats 31 holds the cutting insert 50 so that it is laid flat on the body 10, and the other insert seat 31 holds the cutting insert 50 so that it is laid 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 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. Also, there has been proposed a cutting tool that can use cutting inserts with different shapes in 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 triangular shape, a maximum of 3 sides can be used, if it is a square shape, a maximum of 4 sides can be used, and if it is a rhombus or parallelogram shape, 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, the present invention aims to provide a cutting tool, its cartridge, and a tool holder that enable an increase in the number of usable corners. [Means for solving the problem]

[0006] One aspect of the present invention is a cartridge for a cutting tool, comprising at least two insert seats on which cutting inserts of the same shape can be mounted in different orientations.

[0007] A cartridge having at least two insert seats as described above allows cutting inserts of the same shape to be mounted in different orientations. By mounting a cutting insert in one of the insert seats of the cartridge in an orientation that allows machining at previously unused corners, it becomes possible to use unused cutting edges of the same insert, thereby increasing the number of usable corners.

[0008] In the cartridge described above, each insert seat may be provided with a female threaded portion into which a mounting screw for attaching a cutting insert to the insert seat of the cartridge is screwed.

[0009] In the cartridge described above, the multiple female threaded portions may be in a twisted position relative to each other, with their central axes being in a twisted positional relationship.

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

[0011] In the cartridge described above, the mounting holes may be provided so as to extend in a direction parallel to either the central axis of the female thread portion.

[0012] In the cartridge described above, the mounting holes may be arranged in a twisted position relative to any of the central axes of the female thread portion.

[0013] Another aspect of the present invention is a cutting tool having a cutting insert and a body, A cartridge having at least two insert seats that can accommodate cutting inserts of the same shape in different orientations, This cutting tool includes a cartridge mounting seat provided on the body, which allows the cartridge to be mounted in different orientations.

[0014] In the cutting tool described above, when the cartridge is mounted on the cartridge mounting seat of the body, one of the insert seats may be shaped to hold the cutting insert so that the cutting insert is laid flat on the body, and the other insert seat may be shaped to hold the cutting insert so that the cutting insert is laid vertically on the body.

[0015] In the cutting tool described above, each insert seat may be provided with a female thread portion into which a mounting screw for attaching the cutting insert to the insert seat of the cartridge is threaded.

[0016] The cartridge in the cutting tool described above may have a shape that allows it to contact the seating surface of the cartridge mounting seat and has two parallel contact surfaces.

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

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

[0019] In the cutting tool described above, the mounting hole may be provided perpendicular to the contact 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 including at least two insert mounting portions capable of mounting cutting inserts of the same shape in different postures.

[0025] Also, the cutting tool may include the toolholder as described above.

Brief Description of the Drawings

[0026] [Figure 1] It is a perspective view showing a cutting tool in a first embodiment of the present invention. [Figure 2] It is an enlarged view seen from the side showing the tip portion of the cutting tool. [Figure 3] It is a view showing an enlarged part of a cartridge with a rhombic positive insert mounted thereon. [Figure 4] It is a view showing an enlarged part of a cartridge with a square positive insert mounted thereon. [Figure 5]This diagram shows (A) a cartridge in a horizontal position and (B) a cartridge in an inverted vertical position, both with a diamond-shaped positive insert installed. [Figure 6] (A) A perspective view showing a cartridge lying flat, and (B) a cartridge inverted and placed vertically. [Figure 7] This diagram shows (A) a cartridge in a horizontal position and (B) a cartridge in an inverted vertical position, both with a square positive insert installed. [Figure 8] (A) A perspective view showing a cartridge lying flat, and (B) a cartridge inverted and placed vertically. [Figure 9] This is a perspective view showing a cutting tool in a second embodiment of the present invention. [Figure 10] This diagram shows (A) a cartridge in a horizontal position and (B) a cartridge in an inverted vertical position, both with a diamond-shaped positive insert installed. [Figure 11] (A) A perspective view showing a cartridge lying flat, and (B) a cartridge inverted and placed vertically. [Figure 12] These are diagrams (A) to (G) showing a cartridge with a diamond-shaped positive insert installed, viewed from various angles. [Figure 13] (B) is a plan view of the cartridge in a flat position according to the first embodiment, and (A) is a diagram illustrating the force acting on the cartridge by the cartridge mounting screws. [Figure 14] (B) is a plan view of the cartridge in a vertical position according to the first embodiment, and (A) is a diagram illustrating the force acting on the cartridge by the cartridge mounting screws. [Figure 15] (B) is a plan view of the cartridge in a vertical position in the second embodiment, and (A) is a diagram illustrating the force acting on the cartridge by the cartridge mounting screws. [Figure 16] (B) is a plan view of the cartridge in a horizontal position in the second embodiment, and (A) is a diagram illustrating the force acting on the cartridge by the cartridge mounting screws. [Figure 17] (A) a top view, (B) a left side view, (C) a front view, (D) a right side view, and (E) a bottom view of a cartridge according to a third embodiment of the present invention. [Figure 18] (A) A perspective view showing a cartridge lying flat, and (B) a cartridge inverted and placed vertically. [Figure 19] This is a perspective view showing (A) a cartridge in a horizontal position and (B) a cartridge in an inverted vertical position, with the cutting insert removed from the insert seat. [Figure 20] (A) A plan view of the tool holder in the fourth embodiment of the present invention, (B) a perspective view in a horizontal position, and (C) a perspective view when inverted and placed vertically. [Figure 21] (A) A plan view of the tool holder with the cutting insert removed from the insert seat, (B) a perspective view in a horizontal position, and (C) a perspective view when inverted and placed vertically. [Modes for carrying out the invention]

[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 seating surface 15, a wall surface 16, a drill head 18, etc. (see Figure 1, etc.). The drill head 18 attached to the tip of the body 10 rotates around the central axis X of the body 10, cutting the workpiece 100 to perform processes 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 of the body 10 (see Figure 1, etc.). The cartridge mounting seat 11 in this embodiment has a seat surface 15 and a wall surface 16 perpendicular to the seat surface 15.

[0030] Cartridge 30 is a cartridge capable of mounting two plate-shaped cutting inserts 50 of the same shape (see Figure 1, etc.). Cartridge 30 is mounted on the cartridge mounting seat 11 of the body 10 and is used for cutting and chamfering the workpiece 100 simultaneously (see Figure 2, etc.). In this embodiment, the orientation of cartridge 30 can be changed by removing it from the cartridge mounting seat 11, inverting it around the central axis 30C, and then reattaching it to the cartridge mounting seat 11, thereby changing the cutting insert 50 used for chamfering (see Figure 6, etc.).

[0031] The cartridge 30 is equipped with two insert seats 31 that can accommodate cutting inserts 50 of the same shape in different orientations (see Figures 5 to 8). There are various forms of these different orientations, but in this 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 it is laid flat on the body 10, and the other insert seat 31 (31t) holds the cutting inserts 50 so that they are laid vertically on the body 10 (see Figure 6, etc.).

[0032] Now, while the terms "flat mounting" and "vertical mounting" are used in their general sense in this specification, a more detailed explanation is as follows. Specifically, "flat mounting" refers to a configuration in which, if the cutting insert 50 is provided with an insert mounting hole 53 for an insert mounting screw 60, the mounting hole 53 or the central axis 53A of the insert mounting screw 60 faces the circumferential direction (direction of rotation) of the body 10, or a configuration in which the cutting insert 50, which is assumed to be plate-shaped with a thickness thinner than the length of each side, is mounted with its thickness direction facing the circumferential direction (direction of rotation) of the body 10 (see Figures 1 to 4, 5(A), 6(A), and 7(A)). "Vertical mounting" refers to a configuration in which the cutting insert When the insert 50 is provided with mounting holes 53 for insert mounting screws 60, this refers to an embodiment in which the insert is mounted such that the central axis of the mounting holes 53 and the insert mounting screws 60 are aligned with the central axis 10X of the body 10 or with the radial direction of the body 10, or an embodiment in which the cutting insert 50, which is assumed to be plate-shaped with a thickness thinner than the length of each side, is mounted such that its thickness direction is aligned with the central axis 10X of the body 10 or with the radial direction of the body 10 (see Figures 5(B), 6(B), and 7(B)). Incidentally, although not specifically shown in this embodiment, in the case of a "vertical" configuration in which the cutting insert 50 is mounted such that the central axis of the mounting holes 53 and the insert mounting screws 60 are aligned with the radial direction of the body 10, the corners of the top and bottom surfaces of the cutting insert 50 are sharpened rather than rounded, and the ridges of the corners extending from the top surface to the bottom surface are used as cutting edges.

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

[0034] As described above, the insert seat 31 consists of two insert seats 31h and 31t, which allow cutting inserts 50 of the same shape to be mounted in different orientations. These two insert seats 31 (31h and 31t) are provided at both ends in the longitudinal direction of the cartridge 30 (see Figure 5, etc.).

[0035] The female thread portion 32 is the part into which the insert mounting screw 60 for attaching the cutting insert 50 to the insert seat 31 of the cartridge 30 is screwed (see Figure 7(B), etc.). In this embodiment, the female thread portions 32 of the two insert seats 31 (31h, 31t) are in a twisted position relative to each other, with the central axes of the female thread portions being in a twisted position relative to each other. More specifically, the female thread portion 32 of the insert seat 31h, which is formed so that the cutting insert 50 is laid flat on the body 10, is composed of a hole that is approximately parallel to the cartridge mounting hole 33 (see Figures 5 to 8). On the other hand, the female thread portion of the insert seat 31t, which is formed so that the cutting insert 50 is laid vertically on the body 10, is composed of a hole that is perpendicular or twisted relative to the cartridge mounting hole 33, and is located in a position that is hidden and not visible in Figures 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 Figures 5 to 7). In this embodiment, the cartridge mounting hole 33 is positioned approximately at the center of the longitudinal direction of the cartridge 30. In this case, when the cartridge 30 is removed, its orientation is changed, and then it is reinstalled, 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 approximately overlap. The cartridge mounting hole 33 may be a simple through hole, or it may have an internal thread 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, which is inserted from the back side of the cartridge mounting seat 11, into this internal thread (see Figure 1). The cartridge mounting hole 33 extends in a direction parallel to the central axis of the internal thread portion 32 of the insert seat 31h, which is formed so that the cutting insert 50 is laid flat on the body 10.

[0037] The contact surface 35 is composed of two parallel surfaces that can contact the seat surface 15 of the cartridge mounting seat 11. Specifically, the contact surface 35 corresponds to the upper or lower surface (both indicated by reference numeral 35 in the figures) where one of the openings of the cartridge mounting hole 33 is provided (see Figure 6, etc.). In this embodiment, the cartridge mounting hole 33 is provided perpendicular to this contact surface (upper or lower surface) 35.

[0038] The contact surface 36 is the side surface formed between the upper surface 35 and the lower surface 35 that contacts the wall surface 16 of the cartridge mounting seat 11 (see Figure 2, etc.). The contact surface 36 is perpendicular to the contact surface 35, which consists of either the upper or lower surface.

[0039] As described above, the cartridge 30 of this embodiment can be rotated (reversed) 180° around a predetermined axis to change its orientation, thereby allowing the cutting insert 50 used for chamfering to be changed from one side to the other. The predetermined axis here is the central axis 30C, and in this embodiment, the cartridge 30 can be reversed 180° around this central axis 30C, which is perpendicular to the central axis of the cartridge mounting hole 33, thereby flipping the upper surface 35 and the lower surface 35 and changing its orientation (see Figure 6, etc.).

[0040] With a cartridge 30 or a cutting tool 1 equipped therewith as in this embodiment, it is possible to mount two cutting inserts 50 of the same shape in different orientations. In other words, by mounting a cutting insert 50 in an orientation that allows machining with a corner cutting edge 51 that has not been used conventionally, it becomes possible to use the unused cutting edge 51 of the same cutting insert 50, and consequently, the number of usable corners can be increased. A detailed explanation of this is as follows (see Figures 3 and 4, etc.).

[0041] First, looking at conventional cutting tools, the cutting insert 50 used to cut and chamfer the workpiece 100 simultaneously (see Figure 2) can only be used on a maximum of 3 sides by rotating it 120° at a time to replace the cutting edge 51 if it is a positive-shaped triangle, a maximum of 4 sides by rotating it 90° at a time to replace the cutting edge 51 if it is a quadrilateral (see Figure 4), and a maximum of 2 sides by rotating it 180° to replace the cutting edge 51 if it is a rhombus or parallelogram (see Figure 3). As mentioned above, the maximum number of uses for each cutting insert 50 is 3, 4, and 2, respectively (Note that in Figures 3, 4, and 5, the usable cutting edge portion is indicated by a thick line).

[0042] In contrast, this embodiment uses a cartridge 30 equipped with a flat insert seat 31h and a vertical insert seat 31t, and by using the respective insert seats 31h and 31t, it is possible to use cutting edges that could not be used conventionally. That is, if the cutting insert 50 is, for example, rhombic, conventionally only a maximum of two sides could be used in a flat position (see Figures 3 and 5(A)), but by further positioning it vertically, the remaining two sides can also be used as cutting edges 51 (see Figures 5(B) and 6). In this way, by using the edges of the cutting insert 50 that are not normally used as cutting edges as cutting edges 51, the number of times each cutting insert 50 can be used can be increased.

[0043] Furthermore, if the cutting insert 50 is, for example, a square, conventionally only a maximum of four cutting edges could be used when placed flat (see Figure 4). However, by placing it vertically, an additional four cutting edges can be used, for a total of eight cutting edges (see Figures 7 and 8). It should be noted that the premise of the above explanation is that the portion used as a cutting edge 51 is less than half of the total length of the cutting edge 51. In other words, if less than half of the total length of the cutting edge 51 is used when placed flat, the remaining portion can be used vertically, thereby effectively utilizing the entire portion that can be used as a cutting edge 51. This also 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 or cutting tool 1 equipped therewith of this embodiment, the cartridge mounting hole 33 of the cartridge 30 is provided so as to extend diagonally with respect to the tangential direction of a virtual circle centered on the central axis 10X of the body 10 (see Figures 9 to 12). That is, in the first embodiment described above, the cartridge mounting hole 33 was formed as a hole perpendicular to the upper and lower surfaces 35 of the cartridge 30, in other words, a hole extending along the tangential direction of a virtual circle centered on the central axis 10X of the body 10, whereas in this embodiment, the cartridge mounting hole 33 is formed as a hole extending diagonally (for example, at a 45° angle) with respect to the upper and lower surfaces 35.

[0045] By employing 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 favorable state. That is, in the first embodiment described above, the fastening force of the cartridge mounting screw 40 was applied perpendicularly to the seating surface 15 of the cartridge mounting seat 11 (see Figures 13 and 14), whereas in this embodiment, by applying a 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 the cartridge 30 in a state where two of the outer surfaces of the cartridge 30 are in contact with and pressed against both the seating surface 15 and the wall surface 16 (see Figures 15 and 16).

[0046] As an example of the structure described above, in this embodiment, screw holes are provided that are inclined at 45° to both the seat surface 15 and the wall surface 16, and the cartridge mounting hole 33 of the cartridge 30 is also inclined at 45° to match (see Figures 10 to 12). The central axis 30C, which serves as the rotation center when changing the orientation of the cartridge 30, coincides with the central axis of the cartridge mounting hole 33 (see Figures 10 to 12). For example, if this cartridge 30, which is in a horizontal position, is rotated (reversed) 180° around the central axis 30C to change its orientation and put into a vertical position, the contact surface of the cartridge 30 (indicated by reference numeral 37 in Figure 12), which was in contact with the seat surface 15 when it was in a horizontal position, will come into contact with the wall surface 16 when it is in a vertical position (see Figure 12).

[0047] [Third Embodiment] The number of usable corners can be increased by arranging the insert seats 31 in three or more locations and varying the cutting edge position of the cutting insert 50. As an example of such a cartridge 30, a third embodiment in which the insert seats 31 are arranged in four locations will be described below (see Figures 17 to 19).

[0048] The cartridge 30 in this embodiment is equipped with a total of four insert seats 31: two insert seats 31h for horizontal placement and two insert seats 31t for vertical placement. The two insert seats 31h for horizontal placement are arranged on one surface of the cartridge 30 (for example, the top surface 35) in a point-symmetrical manner with respect to the central axis of the cartridge mounting hole 33 (see Figure 17, etc.). The two insert seats 31t for vertical placement are arranged on the opposite surface of the cartridge 30 (for example, the bottom surface 35) in a point-symmetrical manner with respect to the central axis of the cartridge mounting hole 33 (see Figure 17, etc.). These four insert seats 31 (31h, 31t) are positioned at the four corners of the cartridge 30 so as not to interfere with each other.

[0049] When this cartridge 30 is rotated (reversed) 180° around the central axis of the cartridge mounting hole 33, the cutting insert 50 in the flat (or vertical) position is simply replaced by another flat (or vertical) position, and it remains in a flat (or vertical) position. On the other hand, when the cartridge 30 is turned over and the top surface 35 and bottom surface 35 are reversed, the position of the insert seat 31h for flat positioning and the position of the insert seat 31t for vertical positioning are swapped, and the cutting insert 50 in the flat (or vertical) position is replaced by a cutting insert 50 in a vertical (or flat) position (see Figures 18 and 19).

[0050] With a cartridge 30 or a cutting tool 1 equipped therewith as in this embodiment, it is possible to mount two pairs of four cutting inserts 50 of the same shape in different orientations (two in a horizontal position and two in a vertical position). In other words, by mounting a cutting insert 50 in an orientation that allows machining with a corner cutting edge 51 that has not been used conventionally, it becomes possible to use the unused cutting edge 51 of the same cutting insert 50, and consequently, to increase the number of usable corners.

[0051] [Fourth Embodiment] The present invention can also be applied to cutting tools that do not have the cartridge 30 described above, such as a tool holder for a cutting tool that holds a cutting insert 50. One form of such a tool holder will be described below as a fourth embodiment (see Figures 20 and 21).

[0052] The tool holder 80 of this embodiment includes at least two insert mounting sections 81 that can mount cutting inserts 50 of the same shape in different orientations. The different orientations referred to here are the same orientations as "flat" and "vertical" in the embodiment described above, and accordingly, an insert mounting section 81h for flat mounting and an insert mounting section 81t for vertical mounting are provided at both ends in the longitudinal direction of the tool holder 80 (see Figures 20 and 21).

[0053] By rotating (reversing) such a tool holder 80 by 180°, the cutting inserts 50 used for machining can be swapped from one to the other, and at the same time, the orientation can be switched from a flat (vertical) position to a vertical (flat) position. In short, with such a tool holder 80 or a cutting tool 1 equipped with it, two cutting inserts 50 of the same shape can be mounted in different positions to each other. That is, by mounting the cutting inserts 50 in a position that allows machining with the cutting edge 51 of a corner that has not been used conventionally to be used in one of the insert mounting sections 81, the unused cutting edge 51 of the same cutting insert 50 can be used, and consequently, the number of usable corners can be increased.

[0054] The embodiments described above are merely examples of preferred implementations of the present invention, and are not limited thereto. Various modifications are possible without departing from the spirit of the invention. For example, the embodiments described above illustrated cartridges 30 that are box-shaped, trapezoidal, or substantially rectangular, but the specific shape of the cartridge 30 is not limited to these. In addition to these, although not specifically illustrated, the cartridge can be made substantially triangular, with one or two flat insert seats 31h and two or one vertical insert seats 31t provided at each of the three vertices. By arranging multiple (three or more) insert seats 31 on the cartridge 30 in this manner, and creating a structure that allows more cutting inserts 50 to be attached and used regardless of whether they are placed flat or vertically, the number of usable corners can be simply increased.

[0055] Furthermore, in the embodiments described above, the inclination of the cutting edge 51 of the cutting insert 50 was, in principle, the same in both the horizontal and vertical positions (see Figure 6, etc.), but it is also possible to have configurations where they are not the same. Although not specifically shown, for example, in either the horizontal or vertical position, the insert seat 31 (31h, 31t) may be provided such that the cutting insert 50 is tilted at a predetermined angle θ (see Figure 20(A)), for example 30° or 45°, around the central axis 53A of the insert mounting hole 53.

[0056] Furthermore, in the embodiment described above, the cartridge mounting hole 33 is positioned approximately at the center of the longitudinal direction of the cartridge 30 so that when the cartridge 30 is rotated (reversed) to switch the cutting inserts 50 from one to the other, the positions of the cutting edges 51 of the cutting inserts 50 almost overlap. However, it is also possible to configure the cartridge 30 in such a way that the cutting edges 51 of the cutting inserts 50 do not overlap when the cartridge 30 is reattached in a different orientation.

[0057] Furthermore, in the above-described embodiment, for clarity, a diagram was shown showing a state in which a cutting insert 50 is attached to the insert seat 31 on the side that is not used. However, in reality, it is not necessary to always attach inserts to all insert seats 31, and dummy chips or the like may be attached to prevent chips from entering. [Industrial applicability]

[0058] This invention is preferably applied to cutting tools, their cartridges, and tool holders. [Explanation of Symbols]

[0059] 1...Cutting tools 10…Body 10X…center axis 11…Cartridge mounting seat 15…Seat 16…Wall surface (perpendicular to the seat) 18…Drill head 30... Cartridge 30C…Central axis 31… Insert Seat 31h... Insert seat for flat placement 31t... Insert seat for vertical mounting 32...Female thread section 33…Cartridge mounting hole (mounting hole) 35... The upper or lower surface (contact surface) that contacts the seat surface 15 of the cartridge mounting seat 11. 36... The side surface (contact surface) that contacts the wall surface 16 of the cartridge mounting seat 11. 37…Abutment surface 40…Cartridge mounting screw (mounting screw) 50…Cutting insert 51... Cutting edge 53…Insert mounting hole (mounting hole) 53A…Center axis 60…Insert mounting screw (mounting screw) 80...byte holder 81… Insert mounting section 81h... Insert mounting section for flat placement 81t... Insert mounting section for vertical mounting 100…Work material

Claims

1. A cartridge for a cutting tool that holds a cutting insert, A cartridge comprising at least two insert seats capable of mounting cutting inserts of the same shape in different orientations.

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

3. The cartridge according to claim 2, wherein the multiple female threaded portions are in a twisted positional relationship with respect to the central axes of the female threaded portions.

4. The cartridge according to claim 3, wherein a mounting hole is provided approximately in the center of the cartridge into which a mounting screw for attaching the cutting tool to the body is inserted.

5. The cartridge according to claim 4, wherein the mounting hole is provided so as to extend in a direction parallel to either of the central axes of the female thread portion.

6. The cartridge according to claim 4, wherein the mounting hole is provided in such a twisted positional relationship with respect to any of the central axes of the female thread portion.

7. A cutting tool having a cutting insert and a body, A cartridge having at least two insert seats on which cutting inserts of the same shape can be mounted in different orientations, A cutting tool comprising a cartridge mounting seat provided on the body, which allows the cartridge to be mounted in different orientations.

8. The cutting tool according to claim 7, wherein 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 laid flat on the body, and the other insert seat holds the cutting insert so that the cutting insert is laid vertically on the body.

9. The cutting tool according to claim 7, wherein each of the insert seats is provided with a female thread portion into which a mounting screw for attaching the cutting insert to the insert seat of the cartridge is screwed.

10. The cutting tool according to claim 7, wherein the cartridge has a shape that allows it to contact the seating surface of the cartridge mounting seat and has two contact surfaces that are parallel to each other.

11. The cutting tool according to claim 10, wherein the cartridge mounting seat has a seating surface and a wall surface perpendicular to the seating surface.

12. The cutting tool according to claim 10, wherein a mounting hole for inserting a mounting screw for attaching it to the body is provided approximately in the center of the cartridge.

13. The cutting tool according to claim 12, wherein the mounting hole is provided perpendicular to the contact surface.

14. The cutting tool according to claim 12, wherein the mounting hole is provided so as to extend diagonally with respect to the tangential direction of a virtual circle centered on the central axis of the body.

15. The cutting tool according to any one of claims 7 to 14, wherein the cutting edges of the cutting insert are arranged to substantially overlap when the cartridge is reattached in a different orientation.

16. The cutting tool according to any one of claims 7 to 14, wherein the cutting edges of the cutting insert do not overlap when the cartridge is reattached in a different orientation.

17. The cutting tool according to any one of claims 7 to 14, wherein there are two insert seats, and the cartridge can be rotated 180° to change its orientation and attached to the cartridge mounting seat.

18. A cutting tool holder for holding a cutting insert, A tool holder comprising at least two insert mounting sections capable of mounting cutting inserts of the same shape in different orientations.

19. A cutting tool comprising the tool holder described in claim 18.

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