Cutting tool and method for manufacturing cut workpiece

Abstract

The present invention improves the versatility of a cutting tool. This cutting tool comprises a holder body, a cutting insert, and a first adjustment member. An insert support part has a pocket, slits, and an adjustment hole. The pocket supports the cutting insert. The adjustment hole has a first threaded groove and reaches at least the slits from the cutting insert side. The first adjustment member is inserted into the adjustment hole and screwed into the first threaded groove, thereby changing the spacing between the slits and adjusting the distance between the cutting insert and the rotation axis of the holder body.

Description

Cutting Tool and Method for Manufacturing Cut Product

[0001] The present disclosure relates to a cutting tool used for cutting a workpiece and a method for manufacturing a cut product. Examples of the cutting process may include turning and milling.

[0002] As a cutting tool used when cutting a workpiece, for example, the cutting tool described in Patent Document 1 can be mentioned. The cutting tool described in Patent Document 1 has a hole on the tip side, and a cutting edge is provided toward the hole. In Patent Document 1, the outer diameter of the aforementioned pin can be processed by rotating the cutting tool in a state where a rod-shaped member (pin) is inserted into the hole. For example, the cutting tool described in Patent Document 1 can be used when processing the outer diameter of a pin in a state where the pin is attached to another member.

[0003] Japanese Unexamined Patent Publication No. 2014-168817

[0004] A cutting tool according to one non-limiting aspect of the present disclosure includes a holder main body, a cutting insert, and a first adjustment member. The holder main body has a first end, a second end, and an insert support portion, and has a shape extending from the first end toward the second end along a rotation axis. The insert support portion has a pocket, a slit, and an adjustment hole. The pocket supports the cutting insert with the cutting edge of the cutting insert facing the first end side. The slit is located closer to the second end side than the pocket. The adjustment hole has a first thread groove and extends at least from the first end side to the slit. The first adjustment member is inserted into the adjustment hole and screwed into the first thread groove, thereby changing the interval of the slit to adjust the distance between the cutting insert and the rotation axis.

[0005] This is a schematic perspective view of a cutting tool according to one embodiment. This is a schematic side view of a cutting tool according to one embodiment. This is another schematic side view of a cutting tool according to one embodiment. This is an exploded perspective view of a cutting tool according to one embodiment. This is a schematic side cross-sectional view of a cutting tool according to one embodiment. This is another schematic perspective view of a cutting tool according to one embodiment. This is a schematic plan view of a cutting tool according to one embodiment. This is a schematic enlarged view of an insert support according to one embodiment. This is a process side view of a method for manufacturing a cut workpiece according to one embodiment. This is a schematic side view of a cutting tool according to another embodiment. This is a schematic enlarged view of an insert support according to another embodiment. This is a schematic side view of a cutting tool according to a further embodiment.

[0006] [Embodiment 1] <Cutting Tool: Overview> A cutting tool according to one embodiment of the present disclosure will be described with reference to Figures 1 to 7. Figure 1 is a schematic perspective view of the cutting tool 1 according to this embodiment. Figures 2 and 3 are schematic side views of the cutting tool 1 according to this embodiment. In particular, Figure 2 is a schematic side view of the cutting tool 1 as seen in direction II shown in Figure 1, in other words, a schematic side view as seen in the direction from the first adjustment member 41 described later toward the cutting insert 3. Also, Figure 3 is a schematic side view of the cutting tool 1 as seen in direction III shown in Figure 1, in other words, a schematic side view as seen in the direction from the first insert support part 23 toward the second insert support part 23 of the two insert support parts 23 described later. Figure 4 is an exploded perspective view of the cutting tool 1 according to this embodiment. Figure 5 is a schematic side cross-sectional view of the cutting tool 1 according to this embodiment. In particular, Figure 5 is a cross-sectional view taken along the line V-V shown in Figures 1 and 3.

[0007] Figure 6 is another schematic perspective view of the cutting tool 1 according to this embodiment. However, Figure 6 is a schematic perspective view in which a part of the insert support portion 23, which will be described later, is cut out along the line VI-VI shown in Figure 2. Figure 7 is a schematic plan view of the cutting tool 1 according to this embodiment. In particular, Figure 7 is a schematic plan view of the cutting tool 1 shown in Figure 6, in other words, the cutting tool 1 with a part of the insert support portion 23 cut out.

[0008] The cutting tool 1 may be a tool for manufacturing a machined product by cutting a workpiece while rotating around a rotation axis described later relative to the workpiece. As shown in Figures 1 to 5, the cutting tool 1 may comprise a holder body 2 and a cutting insert 3. The cutting tool 1 may also be a tool that rotates the holder body 2 together with the cutting insert 3 to cut the workpiece using the cutting insert 3.

[0009] <Cutting tool: Holder body> As shown in Figures 1 to 5, the holder body 2 may have a first end 21, a second end 22, and an insert support portion 23. The holder body 2 may have a rotation axis PS and be rotatable around the rotation axis PS by a drive unit. The holder body 2 may rotate around the rotation axis PS in the rotation direction DS shown in Figures 1 to 6. The holder body 2 may have a shape that extends along the rotation axis PS from the first end 21 to the second end 22. Details of the insert support portion 23 will be described later.

[0010] The holder body 2 may further include an insertion portion 24 and a holder slit 25. The insertion portion 24 may have a space into which the cut portion of the workpiece is inserted when the workpiece is cut by the cutting insert 3. The holder slit 25 may be located from the first end 21 to a part of the second end 22, and may penetrate the holder body 2 in a direction perpendicular to the rotation axis PS. The insertion portion 24 and the holder slit 25 may communicate with each other.

[0011] The holder body 2 may include two insert support portions 23 that are rotationally symmetric with respect to the rotation axis PS. In this case, the holder slit 25 may be located between the two insert support portions 23. In this disclosure, "two insert support portions 23 that are rotationally symmetric with respect to the rotation axis PS" does not necessarily mean that the two insert support portions 23 are in positions that are strictly rotationally symmetric with respect to the rotation axis PS. For example, even if the positions of the two insert support portions 23 are shifted from positions that are rotationally symmetric with respect to the rotation axis PS within a range that satisfies machining accuracy, the two insert support portions 23 may be considered to be rotationally symmetric with respect to the rotation axis PS.

[0012] <Cutting tool: Cutting insert and adjustment member> As shown in Figures 1 to 5, the cutting insert 3 may have a cutting edge 31 on the side of the first end 21. The cutting insert 3 may contain a cemented carbide such as tungsten carbide. The cutting insert 3 may cut the workpiece by rotating together with the holder body 2 with the cutting edge 31 in contact with the workpiece.

[0013] Furthermore, as shown in Figures 1 to 5, the cutting tool 1 may include a first adjustment member 41 and a second adjustment member 42. The first adjustment member 41 and the second adjustment member 42 may adjust the distance between the cutting insert 3 and the rotating shaft PS by a structure described later, thereby adjusting the machining diameter of the workpiece. Details of the first adjustment member 41 and the second adjustment member 42 will be described later.

[0014] <Cutting tool: Insert support part: Overview> As shown in Figures 1, 2, 4, and 5, the insert support part 23 may have a pocket 50, a slit 51, an adjustment hole 52, and a fixing device 53. The pocket 50 may have a recess for storing the cutting insert 3. The pocket 50 may also support the cutting insert 3 stored in the recess with the cutting edge 31 of the cutting insert 3 facing the first end 21. The insert support part 23 may fix the cutting insert 3 to the pocket 50 with a fixing device 53 such as a bolt.

[0015] <Cutting tool: Insert support part: Slit> The slit 51 may be located on the side of the second end 22 of the holder body 2 that is closer to the pocket 50. The slit 51 may penetrate a part of the insert support part 23 in a direction perpendicular to the rotation axis PS. In particular, the slit 51 may open on the side of the holder body 2 in the rotation direction DS, the side opposite to the rotation direction DS, and the side of the rotation axis PS of the insert support part 23. Also, in a side view in the direction from the first adjustment member 41 toward the cutting insert 3, the slit 51 may open on the side of the holder body 2 toward the rotation axis PS. For this reason, the smaller the spacing of the slits 51, the smaller the distance between the cutting edge 31 of the cutting insert 3 supported by the insert support part 23 having the slits 51 and the rotation axis PS.

[0016] In this case, the cutting tool 1 can increase the force that the first adjusting member 41 applies to the insert support portion 23 as the spacing between the slits 51 decreases. Generally, when cutting a workpiece by rotating the tool or workpiece, the reaction force acting on the tool tends to increase as the machining diameter decreases. Therefore, with the above configuration, even if the spacing between the slits 51 decreases and the cutting radius decreases, the cutting tool 1 can reduce the effects of chatter vibration and other noises caused by the increased reaction force that the cutting insert 3 receives from the workpiece.

[0017] Furthermore, compared to the case where the slit 51 opens on the side of the insert support portion 23 opposite to the rotation axis PS, the cutting tool 1 reduces the transmission of chatter vibrations to the cutting insert 3 during cutting of the workpiece, thereby improving machining accuracy. In addition, by having the slit 51 open on both the side of the insert support portion 23 in the rotation direction DS and the side opposite to the rotation direction DS, the cutting tool 1 reduces the force required to adjust the spacing of the slit 51, allowing for more precise adjustment of the position of the cutting insert 3.

[0018] <Cutting tool: Insert support part: Adjustment hole> The adjustment hole 52 may extend from the side of the first end 21 to at least the slit 51. In particular, the insert support part 23 may be located between the pocket 50 and the slit 51 in the direction along the rotation axis PS and may have an upper surface 54 facing the side of the first end 21. In this case, the adjustment hole 52 may have an opening at the upper surface 54 and may penetrate from the upper surface 54 to at least the slit 51, from the side of the first end 21 to the side of the second end 22.

[0019] As shown in Figure 5, the adjustment hole 52 may have a first screw groove 61. Also as shown in Figure 5, in this embodiment, the adjustment hole 52 may have a first hole 71 located on the side of the first end 21 that is closer to the slit 51, and a second hole 72 located on the side of the second end 22 that is closer to the slit 51. For this reason, the first hole 71 may penetrate from the side of the first end 21 of the insert support portion 23 to the slit 51. The second hole 72 may extend through the slit 51 on the extension of the first hole 71. In particular, the adjustment hole 52 may have a first screw groove 61 on the inner surface of at least the second hole 72, and the first hole 71 may also have a first screw groove 61 on its inner surface.

[0020] <Cutting tool: First adjustment member> The first adjustment member 41 may be a bolt, for example, and specifically, as shown in Figure 5, it may have a screw head 43 and a shaft 45 that extends from the screw head 43 along the central axis 41C and has screw grooves 44 on its outer surface.

[0021] As shown in Figure 5, the first adjustment member 41 may be inserted into the adjustment hole 52. As described above, the adjustment hole 52 may penetrate at least beyond the slit 51 of the insert support portion 23 towards the first end 21, or in other words, the first adjustment member 41 may extend from the first end 21 towards the second end 22.

[0022] In this case, the first adjustment member 41 is more easily and stably fixed in the adjustment hole 52. When the cutting tool 1 rotates around the rotation axis PS, centrifugal force is applied to the first adjustment member 41. At this time, the centrifugal force is applied in a direction perpendicular to the rotation axis PS. Here, if the first adjustment member 41 is stretched as described above, the first adjustment member 41 is more easily supported in the adjustment hole 52 in the direction in which the centrifugal force is applied. Therefore, the first adjustment member 41 is less likely to break and is more easily and stably fixed.

[0023] <Cutting tool: Adjustment of slit spacing by first adjustment member> As shown in Figure 5, the first adjustment member 41 may be screwed into the first screw groove 61 by the screw groove 44 on the outer surface of the shaft 45. By screwing the first adjustment member 41 into the first screw groove 61, the screw head 43 may press the insert support portion 23 toward the first end 21 side of the slit 51 and toward the second end 22 side of the slit 51. In this way, the first adjustment member 41 may tighten the insert support portion 23 toward the first end 21 side of the slit 51 and the side toward the second end 22 side of the slit 51, thereby changing the spacing of the slit 51.

[0024] In particular, the first adjusting member 41 may be screwed into the first screw groove 61 located on the inner surface of the second hole 72, as shown in Figure 5. As a result, the first adjusting member 41 may be screwed into the first screw groove 61, pressing the side of the insert support portion 23 closer to the first end 21 than to the slit 51, and the side of the insert support portion 23 closer to the second end 22 than to the slit 51. In this way, the first adjusting member 41 may be screwed into the first screw groove 61, thereby reducing the distance between the slits 51.

[0025] By shortening the spacing of the slits 51, in this embodiment, the cutting edge 31 of the cutting insert 3 may be closer to the rotation axis PS. In other words, the first adjustment member 41 may adjust the distance between the cutting insert 3 and the rotation axis PS by changing the spacing of the slits 51.

[0026] As the spacing of the slits 51 changes, the cutting edge 31 of the cutting insert 3 may move along the rotation axis PS. However, as will be described later, the cutting tool 1 according to this embodiment cuts the workpiece by rotating the cutting insert 3 around the rotation axis PS and moving the holder body 2 along the rotation axis PS. For this reason, the movement of the cutting edge 31 of the cutting insert 3 along the rotation axis PS does not significantly affect the accuracy of the machining diameter of the workpiece.

[0027] As described above, the cutting tool 1 can adjust the machining diameter of the workpiece by adjusting the distance between the cutting insert 3 and the rotating shaft PS by adjusting the spacing of the slits 51 with the first adjusting member 41. Therefore, the cutting tool 1 improves the degree of freedom in machining the workpiece and enhances versatility by enabling changes in the machining diameter of the workpiece without requiring the replacement of parts.

[0028] In particular, the first adjustment member 41 in this embodiment may be screwed into the first screw groove 61 to reduce the distance between the slits 51, thereby shortening the distance between the cutting insert 3 and the rotating shaft PS. Therefore, the cutting tool 1 adjusts the distance between the slits 51 by screwing the first adjustment member 41 into the first screw groove 61, which allows the insert support portion 23 to flex more efficiently, enabling more precise adjustment of the machining diameter.

[0029] Alternatively, the first adjustment member 41 may be screwed into the first screw groove 61 to fix the spacing of the slits 51. This allows the insert support 23 to reduce the change in the spacing of the slits 51 caused by the reaction force received from the workpiece during cutting by the cutting tool 1. Therefore, the cutting tool 1 can adjust the spacing of the slits 51 more precisely with the first adjustment member 41, further improving the cutting accuracy of the workpiece.

[0030] <Cutting tool: A pair of first adjusting members> As described above, the cutting tool 1 may include two insert support parts 23. In this case, the cutting tool 1 may include two cutting inserts 3 supported by each of the two insert support parts 23, and two first adjusting members 41 inserted into the respective adjusting holes 52 of the insert support parts 23.

[0031] With the above configuration, the two first adjusting members 41 can individually adjust the distance between the cutting insert 3, which is supported by each of the two insert support parts 23, and the rotating shaft PS. Therefore, with the above configuration, the cutting tool 1 can adjust the positions of the two cutting inserts 3 with greater precision.

[0032] In particular, by individually adjusting the distance between each of the two cutting inserts 3 and the rotating shaft PS, the cutting tool 1 reduces the risk of only one of the cutting inserts 3 contacting the workpiece. By reducing the risk of only one of the cutting inserts 3 contacting the workpiece, the cutting tool 1 reduces the progression of wear on only one of the cutting inserts 3, which would otherwise be caused by an increase in the machining resistance of only one of the cutting inserts 3. Furthermore, with the above configuration, the cutting tool 1 reduces chatter vibration caused by only one of the cutting inserts 3 receiving reaction force from the workpiece.

[0033] Therefore, a cutting tool 1 in which the distance between each of the two cutting inserts 3 and the rotating shaft PS can be individually adjusted can extend the life of the cutting inserts 3 or reduce the decrease in cutting accuracy of the workpiece due to chatter vibration.

[0034] <Cutting tool: Slit shape> The slit 51 may extend from the side of the rotating shaft PS of the insert support portion 23 in a direction away from the rotating shaft PS and closer to the second end 22. In other words, the longer the distance of each part of the slit 51 is from the rotating shaft PS, the closer it is to the second end 22. As a result, when the cutting tool 1 cuts the workpiece, the insert support portion 23 receives a reaction force in a direction that increases the spacing of the slits 51 due to the reaction force received from the workpiece, while the spacing of the slits 51 can be fixed by the first adjustment member 41. Therefore, the cutting tool 1 can reduce the deflection of the insert support portion 23 due to the reaction force that the cutting insert 3 receives from the workpiece, and adjust the cutting radius more precisely.

[0035] Furthermore, by making the extension direction of the slit 51 inclined with respect to the rotation axis PS, it is easier to ensure the length of the slit 51 in this extension direction. By increasing the length of the slit 51, it becomes easier to change the spacing between the slits 51. Therefore, with the above configuration, it becomes easier to adjust the spacing between the slits 51 using the first adjustment member 41.

[0036] Furthermore, by setting the extension direction of the slit 51 to a direction inclined with respect to the direction perpendicular to the rotation axis PS, the variation in the distance between the cutting insert 3 and the rotation axis PS due to variations in the spacing of the slits 51 can be greatly increased. As a result, the cutting tool 1 can greatly change the machining diameter of the workpiece simply by adjusting the spacing of the slits 51 to a smaller size. Increasing the change in the machining diameter of the workpiece in response to changes in the spacing of the slits 51 improves the degree of freedom in the machining diameter of the workpiece that can be machined by the cutting tool 1, and consequently improves the versatility of the cutting tool 1.

[0037] Therefore, the slit 51, which has parts where the distance to the second end 22 decreases as the distance to the rotation axis PS increases, enables the cutting tool 1 to achieve both miniaturization of the holder body 2 and improved versatility.

[0038] <Cutting tool: Position of adjustment hole> The adjustment hole 52 may be located on the side of the slit 51 that is in the rotational direction DS around the rotation axis PS of the holder body 2. In particular, the adjustment hole 52 may be located on the side of the slit 51 that is in the rotational direction DS, rather than the center of the slit 51 in the rotational direction DS.

[0039] In this case, the first adjusting member 41 may fix the width of the slit 51 on the side of the slit 51 in the rotational direction DS. With the above configuration, the first adjusting member 41 can reduce the transmission of force to the insert support portion 23 in the direction that widens the gap between the slits 51 when the holder body 2 rotates in the rotational direction DS while the cutting insert 3 is in contact with the workpiece. Therefore, with the above configuration, the cutting tool 1 can reduce unintended deflection of the insert support portion 23 by the first adjusting member 41.

[0040] <Cutting tool: Relationship between slit and first adjustment member> The more detailed configuration of the insert support portion 23 will be described in more detail with reference to Figures 1 to 7 and Figure 8. Figure 8 is a schematic enlarged view F1 and a schematic enlarged view F2 of the insert support portion 23 according to this embodiment. In particular, schematic enlarged view F1 and schematic enlarged view F2 are both diagrams that show an enlarged view of region VIII shown in Figure 2. However, schematic enlarged view F1 shows an enlarged view of the insert support portion 23 in a side view, and schematic enlarged view F2 shows the insert support portion 23 shown in schematic enlarged view F1, as well as the first adjustment member 41 through the view. In Figure 8, for the sake of simplicity of illustration, the screw groove 44 of the first adjustment member 41 and the first screw groove 61 of the adjustment hole 52 are omitted from the illustration.

[0041] The slit 51 may have a pair of opposing flat inner surfaces, namely a first inner surface 51A and a second inner surface 51B. The first inner surface 51A may be located closer to the first end 21 than the second inner surface 51B. Also, as shown in the schematic enlarged view F2 of Figure 8, the first adjusting member 41 may have a central axis 41C along the extension direction.

[0042] Here, a straight line orthogonal to either the first inner side surface 51A or the second inner side surface 51B, which are the inner side surfaces of the slit 51, is defined as the virtual straight line SL shown in the schematic enlarged view F2 of FIG. 8. In this case, the central axis 41C may be inclined with respect to the virtual straight line SL at the intersection between the central axis 41C and either the first inner side surface 51A or the second inner side surface 51B.

[0043] In particular, as shown in the schematic enlarged view F2 of FIG. 8, the closer the central axis 41C is to the second end 22, the closer it may be to the rotation axis PS than the virtual straight line SL. In this case, as the first adjustment member 41 is screwed into the first screw groove 61, in other words, as the insert support portion 23 bends such that the interval of the slit 51 decreases, the direction of the central axis 41C may change in a direction approaching the virtual straight line SL.

[0044] With the above configuration, as the bending of the insert support portion 23 increases, the cutting tool 1 reduces the risk of the first adjustment member 41 making partial contact with the insert support portion 23, and allows the force from the first adjustment member 41 to be more efficiently transmitted to the insert support portion 23. As described above, since the central axis 41C is inclined with respect to the virtual straight line SL, the cutting tool 1 can be designed to achieve more efficient adjustment of the interval of the slit 51 by the first adjustment member 41.

[0045] <Cutting Tool: Second Adjustment Member> Returning to the reference of FIGS. 1 to 6, the second adjustment member 42 will be described in more detail. The second adjustment member 42 may include a tapered portion 81, a main nut 82, and a lock nut 83. As shown in FIG. 4, the tapered portion 81, the main nut 82, and the lock nut 83 may each have a cylindrical shape. The holder body 2 may be inserted into the tapered portion 81, the main nut 82, and the lock nut 83 in this order from the second end 22 side.

[0046] The tapered portion 81 may contain a material having a certain degree of elasticity such as resin, for example, and may have a plurality of groove portions 81S extending in the direction of the rotation axis PS. As shown in FIG. 5, the inner surface of the tapered portion 81 may be inclined such that the radius decreases from the first end 21 side toward the second end 22 side.

[0047] Accordingly, as the tapered portion 81 moves toward the first end 21 side, the interval between the holder slits 25 may be compressed. Further, the tapered portion 81 may compress the interval between the holder slits 25 to reduce the distance between the two insert support portions 23, and consequently reduce the distance between the two cutting inserts 3. Therefore, the tapered portion 81 may adjust the cutting radius of the workpiece cut by the cutting tool 1 according to its position along the rotation axis PS of the holder body 2.

[0048] The main nut 82 may have a thread groove 82S on an inner surface thereof. In contrast, the outer surface of the holder body 2 may have a second thread groove 62 closer to the second end 22 side than the two insert support portions 23. The thread groove 82S of the main nut 82 may be threadedly engaged with the second thread groove 62 on the outer surface of the holder body 2. Accordingly, the main nut 82 may adjust the position of the tapered portion 81 along the rotation axis PS of the holder body 2 in accordance with the threaded engagement distance between the second thread groove 62 and the thread groove 82S. The main nut 82 may have an anti-slip portion 82L such as unevenness on the outer surface thereof, which may make it easier to screw the thread groove 82S of the main nut 82 into the second thread groove 62.

[0049] As shown in Fig. 4, the main nut 82 may have a marker 82M on an outer surface thereof. As described above, it is assumed that the main nut 82 is configured to adjust the position along the rotation axis PS in accordance with the threaded engagement distance between the second thread groove 62 and the thread groove 82S. In this case, the plurality of grooves 81S and the marker 82M described above facilitate specifying the position of the main nut 82 in the direction along the rotation axis PS based on the mutual positional relationship therebetween.

[0050] The lock nut 83 may have a thread groove 83S on an inner surface thereof. The thread groove 83S of the lock nut 83 may be threadedly engaged with the second thread groove 62 on the outer surface of the holder body 2. Accordingly, the lock nut 83 may support the main nut 82 from the second end 22 side to reduce loosening of the threaded engagement between the second thread groove 62 and the thread groove 82S.

[0051] With the above configuration, the second adjustment member 42 may screw into the second screw groove 62 and tighten the two insert support portions 23 toward each other, thereby adjusting the distance between the two insert support portions 23. This allows the cutting tool 1 to adjust the cutting radius of the workpiece with a simple configuration. In the above embodiment, an example was given in which the second adjustment member 42 includes the tapered portion 81, the main nut 82, and the lock nut 83 as separate components, but the second adjustment member 42 is not limited to this configuration. For example, the tapered portion 81 and the main nut 82 may be formed integrally.

[0052] The cutting tool 1 can adjust the approximate cutting radius of the workpiece using the second adjustment member 42, and can adjust the cutting radius more precisely, as well as the individual distance between each cutting insert 3 and the rotation axis PS, using the first adjustment member 41. Therefore, the cutting tool 1 can adjust the cutting radius of the workpiece more precisely.

[0053] <Method for Manufacturing a Machined Workpiece Using a Cutting Tool> An example of a method for manufacturing a machined workpiece by cutting a workpiece using the cutting tool 1 according to this embodiment will be described with reference to Figure 9. Figure 9 is a side view of the process of manufacturing a machined workpiece according to this embodiment. In particular, Figure 9 shows process side views F3, F4, and F5, which show the cutting tool 1, the workpiece to be cut by the cutting tool 1, and the housing to which the workpiece is attached.

[0054] In this embodiment, the workpiece to be cut by the cutting tool 1 may be a pin P1 attached to the housing H, as shown in the process side view F3. The cutting tool 1 may be used to cut a workpiece that is difficult to rotate around its axis, such as a pin P1, which is difficult to rotate together with the housing H.

[0055] In cutting the pin P1 with the cutting tool 1, the cutting tool 1 may initially be positioned above the pin P1. Here, the cutting tool 1 may be positioned above the pin P1 with the first end 21 of the holder body 2 facing the pin P1, in other words, with the cutting edge 31 of the cutting insert 3 facing the pin P1.

[0056] The cutting tool 1 may be positioned above the pin P1 by aligning the central axis of the pin P1 with the rotation axis PS of the holder body 2. Alternatively, with the cutting tool 1 positioned above the pin P1, the distance between the cutting edge 31 of each cutting insert 3 and the rotation axis PS of the holder body 2 may be adjusted using the first adjustment member 41 and the second adjustment member 42. This may adjust the cutting radius of the cutting tool 1.

[0057] Next, the holder body 2 of the cutting tool 1 may be rotated by the drive unit around the rotation axis PS and in the rotation direction DS, bringing the cutting tool 1 close to the pin P1 so that the cutting edge 31 of the cutting insert 3 comes into contact with the pin P1. In other words, the holder body 2 may be rotated around the rotation axis PS for at least a portion of the time during which the cutting tool 1 is in contact with the pin P1.

[0058] As a result, as shown in the process side view F4, pin P1 may be cut from above by the cutting insert 3, resulting in pin P2 with a portion cut from above. The portion of pin P2 that has been cut may enter the insertion part 24. This allows the cutting tool 1 to continue cutting pin P2 while avoiding interference with pin P2.

[0059] After the pin P2 has been cut to a predetermined length, the cutting tool 1 may be retracted above the pin P2, as shown in the process side view F5, thereby separating the cutting tool 1 from the pin P2 and stopping the rotation of the holder body 2. This may produce a pin P3, which is a machined workpiece cut to a predetermined diameter.

[0060] As described above, the cutting tool 1 can manufacture a workpiece without rotating the workpiece. Furthermore, the cutting tool 1 can adjust the cutting radius of the workpiece more precisely using the first adjustment member 41 and the second adjustment member 42. This allows the cutting tool 1 to reduce manufacturing errors in the cutting radius of the workpiece.

[0061] [Embodiment 2] <Expansion of slit spacing by first adjusting member> Another embodiment of the present disclosure will be described below with reference to Figures 10 and 11. For convenience of explanation, members having the same function as those described in the above embodiment will be denoted by the same reference numerals and their descriptions will not be repeated.

[0062] Figure 10 is a schematic side view of the cutting tool 5 according to this embodiment. Figure 11 is a schematic enlarged view of the insert support portion 23 according to this embodiment. In particular, Figure 11 is an enlarged view of the region XI shown in Figure 10. However, in addition to the insert support portion 23, Figure 11 also shows the first adjustment member 91, which will be described later, through a transparent view. In Figure 11, for the sake of simplicity, the screw groove of the first adjustment member 91 and the first screw groove 61 of the adjustment hole 55, which will be described later, are not shown.

[0063] The cutting tool 5 according to this embodiment may be equipped with a first adjustment member 91 instead of the first adjustment member 41, compared to the cutting tool 1 according to the previous embodiment. Also, the cutting tool 5 according to this embodiment may have adjustment holes 55 instead of adjustment holes 52 in each insert support portion 23, compared to the cutting tool 1 according to the previous embodiment. Except as described above, the cutting tool 5 according to this embodiment may have the same configuration as the cutting tool 1 according to the previous embodiment.

[0064] The first adjusting member 91 may be, for example, a bolt, and specifically, as shown in Figure 11, it may have a screw head 93 and a shaft 95 extending from the screw head 93. The adjusting hole 55 may have only the first hole 71 compared to the adjusting hole 52. The first adjusting member 91 may be inserted into the first hole 71 of the adjusting hole 55 from the side of the first end 21 of the insert support portion 23, and may reach the slit 51.

[0065] The first adjustment member 91 may have screw grooves on the outer surface of the shaft 95. The first hole 71 of the adjustment hole 55 may have a first screw groove 61 between the first end 21 and the slit 51. The screw groove of the first adjustment member 91 may be screwed into the first screw groove 61 of the first hole 71.

[0066] The shaft 95 of the first adjusting member 91 may abut against the second inner surface 51B of the slit 51 on the side of the second end 22. This allows the first adjusting member 91 to screw into the first screw groove 61 of the first hole 71, pushing the first inner surface 51A away from the second inner surface 51B and widening the gap of the slit 51.

[0067] As described above, the cutting tool 5 according to this embodiment may adjust the distance between the cutting edge 31 of the cutting insert 3 and the rotation axis PS of the holder body 2 using the first adjustment member 91. Therefore, the cutting tool 5 improves the degree of freedom in machining the workpiece and enhances versatility by enabling changes in the machining diameter of the workpiece without requiring the replacement of parts.

[0068] In particular, the cutting tool 5 eliminates the need for a second hole 72 located on the second end 22 side of the slit 51 in the adjustment hole 55, while still allowing adjustment of the spacing of the slit 51 by the first adjustment member 91. Therefore, the cutting tool 5 allows for changes in the machining diameter of the workpiece with a simpler configuration.

[0069] [Embodiment 3] <Another example of slit position> Further embodiments of the present disclosure will be described below with reference to Figure 12. Figure 12 is a schematic side view of the cutting tool 6 according to this embodiment.

[0070] In this embodiment, the cutting tool 6 may have a slit 51 that opens on the side of the holder body 2 opposite to the rotation axis PS, compared to the cutting tool 1 according to the previous embodiment. In particular, the slit 51 may open on the side of the insert support portion 23 that is in the rotation direction DS, the side opposite to the rotation direction DS, and the side opposite to the rotation axis PS of the holder body 2. Except as stated above, the cutting tool 6 according to this embodiment may have the same configuration as the cutting tool 1 or cutting tool 5 according to the previous embodiment.

[0071] In this embodiment, the first adjusting member 41 may bend the side of the insert support portion 23 closer to the first end 21 than the slits 51, away from the rotation axis PS of the holder body 2, by reducing the spacing of the slits 51. For this reason, the first adjusting member 41 may increase the distance between the cutting insert 3 and the rotation axis PS by reducing the spacing of the slits 51. For the reasons described above, the cutting tool 6 improves the degree of freedom in machining the workpiece and enhances versatility by enabling changes in the machining diameter of the workpiece without requiring the replacement of parts.

[0072] <Summary> The cutting tool according to Embodiment 1 of the present disclosure comprises a holder body, a cutting insert, and a first adjustment member, wherein the holder body has a first end, a second end, and an insert support portion, and has a shape that extends from the first end toward the second end along the axis of rotation, the insert support portion has a pocket, a slit, and an adjustment hole, the pocket supports the cutting insert with the cutting edge of the cutting insert facing toward the first end, the slit is located toward the second end than the pocket, the adjustment hole has a first screw groove and extends from the side of the first end to at least the slit, and the first adjustment member is inserted into the adjustment hole and screwed into the first screw groove, thereby changing the spacing of the slit and adjusting the distance between the cutting insert and the axis of rotation.

[0073] A cutting tool according to embodiment 2 of the present disclosure may be configured such that, in embodiment 1 above, the adjustment hole has a first hole and a second hole, the first hole penetrates from the first end of the insert support portion to the slit, the second hole extends through the slit on the extension of the first hole and has a first screw groove, and the first adjustment member is screwed into the first screw groove to reduce the distance between the slits.

[0074] In the cutting tool according to embodiment 3 of the present disclosure, in embodiment 1 described above, the adjustment hole may have a first hole, the first hole may have a first screw groove between the first end of the insert support portion and the slit, and the first adjustment member may be screwed into the first screw groove to widen the gap between the slits.

[0075] A cutting tool according to embodiment 4 of the present disclosure may be configured such that, in any of embodiments 1 to 3 above, the holder body comprises two insert support portions that are rotationally symmetric with respect to the rotation axis, two cutting inserts supported by each of the insert support portions, and two first adjustment members inserted into the adjustment holes of each of the insert support portions.

[0076] A cutting tool according to embodiment 5 of the present disclosure may further include a second adjusting member in embodiment 4 above, wherein the outer surface of the holder body has a second screw groove on the side of the second end that is closer to the two insert support portions, and the second adjusting member screws into the second screw groove and tightens the two insert support portions toward each other to adjust the distance between the two insert support portions.

[0077] In any of the embodiments 1 to 5 described above, the cutting tool according to embodiment 6 of the present disclosure may be configured such that the shorter the spacing between the slits, the shorter the distance between the cutting edge of the cutting insert supported by the insert support portion having the slits and the rotation axis.

[0078] In any of the embodiments 1 to 6 described above, the cutting tool according to embodiment 7 of the present disclosure may be configured such that the first adjusting member extends from the first end to the second end.

[0079] In any of the embodiments 1 to 7 described above, the cutting tool according to embodiment 8 of the present disclosure may be configured such that, as the distance of each part of the slit increases from the rotation axis, the distance from the second end decreases.

[0080] In any of the embodiments 1 to 8 described above, the cutting tool according to embodiment 9 of the present disclosure may be configured such that the slit opens on the side of the insert support portion that is in the direction of rotation around the rotation axis of the holder body, the side opposite to the direction of rotation, and the side of the rotation axis.

[0081] In any of the embodiments 1 to 9 described above, the cutting tool according to embodiment 10 of the present disclosure may be configured such that the slit has a pair of flat inner surfaces facing each other, and the central axis along the extension direction of the first adjusting member is inclined with respect to a virtual straight line perpendicular to the inner surface at the intersection of the central axis and one of the inner surfaces.

[0082] In the cutting tool according to embodiment 11 of the present disclosure, in embodiment 10 described above, the central axis may be configured to be closer to the rotation axis than the virtual straight line as it approaches the second end.

[0083] In any of the embodiments 1 to 11 described above, the cutting tool according to embodiment 12 of the present disclosure may be configured such that the adjustment hole is located on the side of the slit that is in the rotational direction around the rotation axis of the holder body.

[0084] A method for manufacturing a machined workpiece according to aspect 13 of the present disclosure includes the steps of bringing a cutting tool, as described in any of aspects 1 to 12 above, into contact with a workpiece, and separating the cutting tool from the workpiece, wherein the holder body of the cutting tool is rotated around the rotation axis for at least a portion of the duration of the step of bringing the cutting tool into contact with the workpiece.

[0085] The inventions described in this disclosure have been explained above based on the drawings and embodiments. However, the inventions described in this disclosure are not limited to the embodiments described above. That is, the inventions described in this disclosure can be modified in various ways within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the inventions described in this disclosure. In other words, it should be noted that it is easy for those skilled in the art to make various modifications or alterations based on this disclosure. Furthermore, it should be noted that these modifications or alterations are included in the scope of this disclosure.

[0086] The cutting tools in each of the embodiments described above have been described as so-called rotary tools used in milling operations. However, the cutting tools in each embodiment are not limited to rotary tools. For example, the cutting tools in each embodiment can be used as cutting tools used in turning operations such as outer diameter machining. When the cutting tools in each embodiment are cutting tools used in turning operations, the rotation axis of the rotary tool may be replaced with the central axis. In such a case, the holder body of the cutting tool can be considered to have a first end, a second end, and an insert support portion, and to have a shape that extends from the first end to the second end along the central axis. Furthermore, in the cutting tool described above, the side in the direction of rotation around the rotation axis and the side opposite to the direction of rotation can be considered as one side and the other side in the circumferential direction around the central axis.

[0087] 1 Cutting tool 2 Holder body 3 Cutting insert 21 First end 22 Second end 23 Insert support part 31 Cutting edge 41 First adjustment member 42 Second adjustment member 50 Pocket 51 Slit 52 Adjustment hole 61 First screw groove 62 Second screw groove 71 First hole 72 Second hole

Claims

1. A cutting tool comprising a holder body, a cutting insert, and a first adjustment member, wherein the holder body has a first end, a second end, and an insert support portion, and has a shape that extends from the first end toward the second end along the axis of rotation, the insert support portion has a pocket, a slit, and an adjustment hole, the pocket supports the cutting insert with the cutting edge of the cutting insert facing toward the first end, the slit is located toward the second end than the pocket, the adjustment hole has a first screw groove and extends from the side of the first end to at least the slit, and the first adjustment member is inserted into the adjustment hole and screwed into the first screw groove, thereby changing the spacing of the slit and adjusting the distance between the cutting insert and the axis of rotation.

2. The cutting tool according to claim 1, wherein the adjustment hole has a first hole and a second hole, the first hole penetrates from the first end of the insert support portion to the slit, the second hole extends through the slit on the extension of the first hole and has a first screw groove, and the first adjustment member screws into the first screw groove to reduce the distance between the slits.

3. The cutting tool according to claim 1, wherein the adjustment hole has a first hole, the first hole has a first screw groove between the first end of the insert support portion and the slit, and the first adjustment member screws into the first screw groove to widen the gap between the slits.

4. The cutting tool according to any one of claims 1 to 3, wherein the holder body comprises two insert support portions positioned rotationally symmetric with respect to the rotation axis, two cutting inserts supported by each of the insert support portions, and two first adjusting members inserted into the adjustment holes of each of the insert support portions.

5. The cutting tool according to claim 4, further comprising a second adjusting member, wherein the outer surface of the holder body has a second screw groove on the side of the second end that is closer to the two insert support portions, and the second adjusting member screws into the second screw groove and tightens the two insert support portions toward each other to adjust the distance between the two insert support portions.

6. The cutting tool according to any one of claims 1 to 5, wherein the shorter the spacing between the slits, the shorter the distance between the cutting edge of the cutting insert supported by the insert support portion having the slits and the rotation axis.

7. The cutting tool according to any one of claims 1 to 6, wherein the first adjusting member extends from the first end to the second end.

8. The cutting tool according to any one of claims 1 to 7, wherein the distance of each part of the slit from the rotation axis decreases as the distance from the rotation axis increases.

9. The cutting tool according to any one of claims 1 to 8, wherein the slit opens on the side of the holder body in the direction of rotation around the rotation axis, the side opposite to the direction of rotation, and the side of the rotation axis of the insert support portion.

10. The cutting tool according to any one of claims 1 to 9, wherein the slit has a pair of flat inner surfaces facing each other, and the central axis along the extension direction of the first adjusting member is inclined with respect to a virtual straight line perpendicular to the inner surface at the intersection of the central axis and one of the inner surfaces.

11. The cutting tool according to claim 10, wherein the central axis is closer to the rotation axis than the virtual straight line as it approaches the second end.

12. The cutting tool according to any one of claims 1 to 11, wherein the adjustment hole is located on the side of the slit that is in the rotational direction around the rotation axis of the holder body.

13. A method for manufacturing a machined workpiece, comprising the steps of bringing a cutting tool according to any one of claims 1 to 12 into contact with a workpiece, and removing the cutting tool from the workpiece, wherein for at least a portion of the time of bringing the cutting tool into contact with the workpiece, the holder body of the cutting tool is rotated around the rotation axis.

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