Body and cutting tool

Abstract

The invention provides a main body and a cutting tool, wherein a cutting insert can be easily dismounted and mounted. A main body (10) has an insert receptacle (11) to which a cutting insert (50) is attached, the insert receptacle (11) having a lower jaw section (13) having a threaded hole (18), an upper jaw section (15) provided at a distance from the lower jaw section (13), and a receiving groove section (16) formed between the lower jaw section (13) and the upper jaw section (15), the receiving groove section (16) having the cutting insert (50) inserted therein. The groove width (W1) of the front end side of the accommodating groove part (16) is narrower than the groove width (W2) of the rear end side.

Description

TECHNICAL FIELD

[0001] The present application relates to a body and a cutting tool. BACKGROUND

[0002] In Patent Literatures 1 and 2, a cutting tool for hole machining is disclosed, in which a cutting insert is attached to an insert seating of a body. In addition, in Patent Literature 3, a cutting tool provided with a cutting insert having a guide portion that slides in contact with an inner peripheral surface of a hole to be machined to guide the cutting insert is disclosed.

[0003] Prior Art Documents

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2023-165067

[0006] Patent Literature 2: Japanese Patent Application Laid-Open No. 2006-192553

[0007] Patent Literature 3: Japanese Patent Application Laid-Open No. 2004-268154

[0008] Technical Problem

[0009] In the cutting tools described in Patent Literatures 1 to 3, when attaching a cutting insert to a body, the cutting insert is arranged in an insert seating of the body while being pressed and held by one hand, and the cutting insert is threadedly fastened to the body by a screw with the other hand. In addition, when detaching the cutting insert, the screw is loosened while holding the cutting insert so as not to fall off. However, if the tool diameter of the cutting tool is reduced in order to perform hole machining of a small diameter, the above-mentioned attaching operation and detaching operation become difficult. SUMMARY

[0010] The present application has been achieved in view of the above-described circumstances, and aims to provide a body and a cutting tool in which a cutting insert can be easily attached and detached.

[0011] One embodiment of the present application provides a body having an insert seating in which a cutting insert is attached, wherein the insert seating has:

[0012] a lower jaw portion having a threaded hole;

[0013] an upper jaw portion disposed apart from the lower jaw portion;

[0014] a receiving groove portion formed between the lower jaw portion and the upper jaw portion, and into which the cutting insert is inserted, wherein

[0015] a groove width of a front end side of the receiving groove portion is narrower than a groove width of a rear end side.

[0016] In the main body of the above-described configuration, the lower jaw portion and the upper jaw portion of the accommodation groove portion that constitute the blade accommodation seat can elastically sandwich and hold the cutting blade. Therefore, when performing the attachment and detachment operation of the cutting blade with respect to the blade accommodation seat, it is not necessary to hold the cutting blade by hand, and thus the attachment and detachment operability of the cutting blade can be improved. In particular, even if the diameter of the main body is reduced in order to perform hole machining of a small diameter, the cutting blade can be smoothly attached and detached from the blade accommodation seat without falling off.

[0017] The threaded hole can be disposed at a position that does not coincide with the upper jaw portion when viewed from the upper jaw portion side.

[0018] The threaded hole can have a central axis that is inclined with respect to a perpendicular line of a seating surface in the lower jaw portion that abuts against the cutting blade.

[0019] The central axis of the threaded hole can be inclined with respect to the perpendicular line of the seating surface in a manner that approaches the other side from one side of the main body when viewed in the front view.

[0020] The central axis of the threaded hole can be a central axis that is inclined toward the rear end side in a direction away from an abutting surface in the upper jaw portion that abuts against the cutting blade with respect to the perpendicular line of the seating surface when viewed in the side view.

[0021] An embodiment of the present application provides a cutting tool including the above-described main body and a cutting blade that is attached to the blade accommodation seat of the main body.

[0022] The cutting blade can be attached to the blade accommodation seat of the main body in a state in which the center of an inscribed circle when the cutting blade is viewed in the front view coincides with the center axis of rotation of the main body.

[0023] According to the present application, a main body and a cutting tool that can easily attach and detach a cutting blade are provided. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is an oblique view of the cutting tool provided by the present embodiment.

[0025] Fig. 2 is an exploded oblique view of the cutting tool provided by the present embodiment.

[0026] Fig. 3 is a plan view of the cutting tool.

[0027] Fig. 4 is a right side view of the cutting tool.

[0028] Fig. 5 is a bottom view of the cutting tool.

[0029] Fig. 6is a front view of the cutting tool.

[0030] Fig. 7 is an oblique view of the main body.

[0031] Fig. 8 is an oblique view of the main body viewed from the bottom surface side.

[0032] Fig. 9 is a plan view of the main body.

[0033] Fig. 10 is Fig. 9 is a cross-sectional view of the main body along X-X.

[0034] Fig. 11 is Fig. 9 is a cross-sectional view of the main body along XI-XI.

[0035] Fig. 12 is an oblique view of the cutting insert.

[0036] Fig. 13 is a plan view of the cutting insert.

[0037] Fig. 14 is a right side view of the cutting insert.

[0038] Fig. 15 is a bottom view of the cutting insert.

[0039] Fig. 16 is a front view of the cutting insert.

[0040] Fig. 17 is Fig. 3 is a cross-sectional view of the cutting tool along XVII-XVII.

[0041] Fig. 18 is Fig. 3 is a cross-sectional view of the cutting tool along XVIII-XVIII. DETAILED DESCRIPTION

[0042] A preferred embodiment of the main body and the cutting tool according to the present application will be described in detail below with reference to the accompanying drawings.

[0043] As shown in Figs. 1 to 6 , the cutting tool 100 according to the present embodiment has a main body 10 and a cutting insert 50. The cutting tool 100 has the cutting insert 50 mounted at the front end of the main body 10. The cutting tool 100 rotates around the center axis AX1 of rotation, and bores a workpiece by the cutting insert 50 at the front end of the main body 10, and can also be used for turning of the workpiece during cutting rotation.

[0044] As shown in Figs. 7 to 11As shown, the main body 10 has a blade pocket 11. The blade pocket 11 functions as a blade mounting seat that mounts the cutting blade 50, and is formed at the front end of the main body 10. The cutting blade 50 is mounted on the blade pocket 11.

[0045] The blade pocket 11 includes a lower jaw portion 13 having a seat surface 12 and an upper jaw portion 15 having an abutment surface 14. The lower jaw portion 13 and the upper jaw portion 15 extend toward the front end side of the main body 10.

[0046] The lower jaw portion 13 and the upper jaw portion 15 are disposed apart from each other. A space between the lower jaw portion 13 and the upper jaw portion 15 forms a receiving groove portion 16 into which the cutting blade 50 is inserted. With respect to the receiving groove portion 16, the groove width Wl at the front end side of the main body 10 is narrower than the groove width W2 at the rear end side (refer to FIG. 2). Fig. 10 ).

[0047] With respect to the upper jaw portion 15 that constitutes the blade pocket 11, the width dimension thereof in plan view is smaller than the width dimension of the lower jaw portion 13 in plan view, and the upper jaw portion 15 is disposed at a position opposite to one side of the lower jaw portion 13 in the width direction (refer to FIG. 2). Fig. 9 ). Note that, in the present embodiment, the plan view of the main body 10 refers to a field of view observed from a direction that is perpendicular to the front view direction (a direction that is vertical up and down), the front view direction being a direction in which the main body 10 is observed from the front end side thereof with the center axis AXl as a reference. Fig. 6 The cutting edge 53 shown is oriented in a substantially horizontal direction. The seat surface 12 of the lower jaw portion 13 has a threaded hole 18 formed therein, and a fastening member for fastening the cutting blade 50, which is a screw 75, is threadedly connected to the threaded hole 18 (refer to FIG. 2). Fig. 1 ). In this way, the blade pocket 11 of the main body 10 has the seat surface 12 of the lower jaw portion 13 and the abutment surface 14 of the upper jaw portion 15, and the lower jaw portion 13 has the threaded hole 18. In addition, an avoidance recess 19 is formed in the upper jaw portion 15, and the avoidance recess 19 is for avoiding interference between the screw 75 that is threadedly connected to the threaded hole 18 of the lower jaw portion 13 and the upper jaw portion 15.

[0048] In the front view of the main body 10, the threaded hole 18 has a center axis CLl that is inclined with respect to a perpendicular line PLl of the seat surface 12 (refer to FIG. 2). Fig. 11 ). In addition, in the side view of the main body 10, the center axis CLl of the threaded hole 18 is inclined toward the rear end side in a direction away from the abutment surface 14 with respect to the perpendicular line PLl of the seat surface 12 (refer to FIG. 3). Fig. 10). In this way, by inclining the center axis CL1 of the threaded hole 18 with respect to the perpendicular PL1 of the seat surface 12, it is possible to increase the thread in the threaded hole 18. In particular, as described in the present embodiment, in the front view of the main body 10, if the center axis CL1 of the threaded hole is inclined with respect to the perpendicular PL1 in such a manner as to approach the other side 10b from the one side 10a of the main body 10, it is possible to further increase the thread in the threaded hole 18.

[0049] The main body 10 has a front limiting surface 21 and a rear limiting surface 22. The front limiting surface 21 is provided on the front end side of the main body 10 in the insert pocket 11, and the rear limiting surface 22 is provided on the rear end side of the main body 10 in the insert pocket 11. The front limiting surface 21 is formed on the front end of the lower jaw portion 13 constituting the insert pocket 11, and the rear limiting surface 22 is formed on the inner side of the insert pocket 11. The front limiting surface 21 and the rear limiting surface 22 are formed in the lateral width direction of the insert pocket 11.

[0050] In the plan view of the main body 10, Fig. 9 The front limiting surface 21 and the rear limiting surface 22 are not parallel to each other in the plan view of the main body 10. Specifically, the front limiting surface 21 is inclined gradually toward the front end side from the one side 10a toward the other side 10b of the main body 10, and the rear limiting surface 22 is inclined gradually toward the rear end side from the one side 10a toward the other side 10b of the main body 10. Therefore, in the plan view of the main body 10, Fig. 9 The front limiting surface 21 and the rear limiting surface 22 are disposed in a "figure of eight" shape in such a manner as to move away from each other along from the one side 10a toward the other side 10b in the plan view of the main body 10. In addition, the front limiting surface 21 is an inclined surface that is inclined gradually toward the front end side of the lower jaw portion 13 from the seat surface 12 of the lower jaw portion 13 toward the bottom of the lower jaw portion 13. In addition, a relief groove 23 for avoiding collision with the cutting insert 50 is formed between the rear limiting surface 22 and the seat surface 12.

[0051] The main body 10 has two groove portions 31, 32 (refer to Fig. 8 and Fig. 9 ). One groove portion 31 is formed in the lower jaw portion 13 on the side opposite to the upper jaw portion 15, and the other groove portion 32 is formed in the upper jaw portion 15 on the side opposite to the lower jaw portion 13. The groove portions 31, 32 are formed along the center axis AX1 of the rotation of the main body 10. Furthermore, the main body 10 has two discharge ports 33, 34. The discharge ports 33, 34 are discharge ports for coolant, and the coolant delivered through a delivery passage (omitted from illustration) formed inside the main body 10 is discharged from the discharge ports 33, 34. The rear end of one groove portion 31 communicates with one discharge port 33, and the rear end of the other groove portion 32 communicates with the other discharge port 34. The coolant is a fluid provided from the machine side in machining for the purpose of discharge of cutting chips, cooling and lubrication of tools and machined materials, rust prevention, and the like.

[0052] Further, the main body 10 has a discharge groove 35 (refer to Fig. 7 ). The discharge groove 35 is a concave groove portion for discharging chips generated at the time of cutting, which is formed from the front end side of the main body 10 toward the rear end side of the main body 10.

[0053] As shown in Figs. 12 to 16 , the cutting insert 50 is inserted into the insert pocket 11 of the main body 10 with the rear portion 52 thereof facing the main body 10 and is mounted to the insert pocket 11 (refer to Fig. 2 ). The cutting insert 50 is formed of, for example, cemented carbide, cermet, ceramic, ultra-high pressure sintered body, diamond, or the like.

[0054] The cutting insert 50 has a cutting edge 53, two guide portions 54, 55, and a fluid groove 56. The cutting edge 53, the guide portions 54, 55, and the fluid groove 56 are provided at the front portion 51 of the cutting insert 50. Note that the cutting insert 50 can have a plurality of cutting edges 53. Further, the cutting insert 50 can have at least two guide portions 54, 55, and thus the cutting insert 50 can have three or more guide portions.

[0055] In a state where the cutting insert 50 is mounted to the main body 10, the cutting edge 53 cuts a workpiece by relative rotation with the workpiece. The cutting edge 53 has a central edge 61 and a peripheral edge 62. The central edge 61 mainly cuts the central side of the bottom of the hole, and the peripheral edge 62 mainly cuts the peripheral side of the bottom of the hole. The central edge 61 projects more toward the front end side than the peripheral edge 62, and thus a stepped portion 63 is formed between the central edge 61 and the peripheral edge 62. By providing the stepped portion 63, the chips are cut in the longitudinal direction in such a manner as to extend in the direction of the chips, compared to a case where the stepped portion 63 is not provided, and thus a smaller chip shape is formed. Therefore, the generated chips are less likely to clog at the time of discharge.

[0056] At the time of cutting the workpiece, the guide portions 54, 55 are in sliding contact with the inner face of the hole of the workpiece and guide the cutting tool 100. The guide portion 54 is provided at the opposite side of the cutting insert 50 from the upper face 57, and the guide portion 55 is provided at the substantially opposite side of the cutting edge 53 from the peripheral edge side (refer to Fig. 16 ). The cutting insert 50 has a substantially semicircular shape in the front view, and the two guide portions 54, 55 are formed in circular arc shapes in the front view (refer to Fig. 16 ). At the time of cutting the workpiece, a cutting force F is generated in the cutting edge 53 in the cutting insert 50. If the center of an excircle R that circumscribes the guide portions 54, 55 and the end portion of the peripheral side of the cutting edge 53 in the front view is set as O, then in this example, for example, the cutting force F is generated radially outward from a position closer to the center O of the excircle R than the center of the cutting edge 53 in the front view (refer to Fig. 16). In the cutting insert 50 of this example, the guide portions 54, 55 are arranged in a manner that sandwiches the generated cutting force F. That is, the guide portions 54, 55 are arranged so that even if the direction of the cutting force F changes, the cutting force F is controlled between the two guide portions 54, 55. Therefore, even if the direction of the cutting force F changes, the cutting force F can be received by the two guide portions 54, 55, and thus more stable machining can be performed.

[0057] A fluid groove 56 is provided between the two guide portions 54, 55. In a state in which the cutting insert 50 is mounted to the main body 10, the fluid groove 56 is formed at a position that communicates with one of the groove portions 31 of the main body 10. This fluid groove 56 is recessed in a circular arc shape when viewed from the front. The bottom of the fluid groove 56 is formed so as to be recessed inward from the circumscribed circle R when viewed from the front (see FIG. 2). Fig. 6 ) The distance L between the center O of the circumscribed circle R and the nearest point P of the fluid groove 56 from the center O of the circumscribed circle R is greater than ¼ of the diameter D of the circumscribed circle R when viewed from the front (see FIG. 2). Fig. 6 ) In addition, the shape of the bottom of the fluid groove 56 when viewed from the front of the main body 10 is not limited to a circular arc shape, and can be formed in a straight line shape. In the case of being formed in a circular arc shape, both the area of the guide portion 54 and the fluid passage cross-sectional area of the fluid groove 56 can be made large. In the case of being formed in a straight line shape, the distance L from the center O of the circumscribed circle R to the nearest point P can be made long, and thus the fluid groove 56 can be formed while the strength of the cutting insert 50 is kept high. The formation shape of the fluid groove 56 can be appropriately selected in accordance with the desired effect.

[0058] The rear portion 52 of the cutting insert 50 is formed in a flat plate shape in which the bottom surface 71 is formed as a smooth surface. When the cutting insert 50 is mounted to the insert pocket 11 of the main body 10, the bottom surface 71 of the rear portion 52 thereof abuts against the seat surface 12.

[0059] The cutting insert 50 has a through-hole 73. The through-hole 73 is a fastening portion for fixing the cutting insert 50 to the insert pocket 11 of the main body 10, and is formed in the rear portion 52 of the cutting insert 50. The through-hole 73 is a tapered hole in which the upper side is large in diameter and is in a horn shape. A screw 75 that is a fastening member for fastening the cutting insert 50 to the main body 10 is inserted into the through-hole 73 from above. The head 77 of the screw 75 abuts against a slope of the tapered hole in the horn shape of the large diameter portion of the through-hole 73 (see FIG. 2). Fig. 1 ) The through-hole 73 has a center axis CL2 that is inclined with respect to the perpendicular line PL2 of the bottom surface 71 in the front view of the cutting insert 50 (see FIG. 2).

[0060] The through-hole 73 has a center axis CL2 that is inclined with respect to the perpendicular line PL2 of the bottom surface 71 in the front view of the cutting insert 50 (see FIG. 2). Fig. 16). Furthermore, in a side view of the cutting insert 50, the center axis CL2 of the through-hole 73 is inclined rearward with respect to a perpendicular PL2 of the bottom surface 71 in a direction from the upper surface 57 toward the bottom surface 71.

[0061] The cutting insert 50 has a front abutment surface 81 and a rear abutment surface 82 (see Fig. 15 ). The front abutment surface 81 is provided on the front side with respect to the through-hole 73, and the rear abutment surface 82 is provided on the rear side with respect to the through-hole 73. The front abutment surface 81 and the rear abutment surface 82 are formed by surfaces toward the rear side. The front abutment surface 81 is provided at a position closer to the lower side than the bottom surface 71 abutting against the seat surface 12 of the insert pocket 11, and is an inclined surface inclined toward the lower side and the front side. Note that the front abutment surface 81 can not necessarily be an inclined surface, but can be a vertical surface. If the front abutment surface 81 is provided as an inclined surface having an obtuse angle with respect to the bottom surface 71, the cutting force F generated toward the lower side of the cutting insert 50 during machining can be more effectively received. The rear abutment surface 82 is constituted by two divided abutment surfaces 82a, 82b divided left and right. The divided abutment surfaces 82a, 82b have a recess therebetween, and therefore when the cutting insert 50 is mounted to the main body 10, the cutting insert 50 necessarily abuts against the rear limiting surface 22 of the insert pocket 11 on the outer side of the rear abutment surface 82, and the cutting insert 50 can be fixed without play.

[0062] In a plan view of the Fig. 15 , the front abutment surface 81 and the rear abutment surface 82 are not parallel to each other. Specifically, the front abutment surface 81 is inclined gradually forward from one side 50a to the other side 50b of the cutting insert 50, and the rear abutment surface 82 is inclined gradually rearward from the one side 50a to the other side 50b of the cutting insert 50. In this way, in a plan view of the Fig. 15 , the front abutment surface 81 and the rear abutment surface 82 are provided in an "eight" shape in such a manner as to be apart from each other along from the one side 50a toward the other side 50b (see Fig. 15 ). During cutting, the cutting insert 50 is subjected to a cutting force in the direction of the other side 10b of the main body 10 along the rear limiting surface 22. At this time, the front limiting surface 21 of the main body 10 abutted against by the front abutment surface 81 of the cutting insert 50 is inclined in the direction opposite to the rear limiting surface 22, and therefore the cutting insert 50 which is intended to move in the direction of the one side 10b of the main body 10 can be pressed.

[0063] Furthermore, as shown in Fig. 17 and Fig. 18As shown, in a state where the cutting insert 50 is arranged in the insert pocket 11 of the main body 10, the center axis CL2 of the through-hole 73 is offset with respect to the center axis CL1 of the threaded hole 18 formed in the lower jaw portion 13 constituting the insert pocket 11. Specifically, the offset center axis CL2 of the through-hole 73 is closer to the front end side and the other side 10b of the main body 10 than the center axis CL1 of the threaded hole 18.

[0064] In this way, by misaligning the center axis CL2 of the through-hole 73 of the cutting insert 50 with the center axis CL1 of the threaded hole 18 of the insert pocket 11, when the cutting insert 50 is assembled to the main body 10, after the front abutment surface 81 abuts against the front limiting surface 21 of the insert pocket 11, the cutting insert 50 slides on the front limiting surface 21 in the direction of the one side 10a of the main body 10 while being retracted toward the rear of the main body 10. Thus, it is possible to easily abut the cutting insert 50 against both the front limiting surface 21 and the rear limiting surface 22.

[0065] Next, the case where the cutting insert 50 is mounted to the main body 10 will be described. In order to mount the cutting insert 50 to the main body 10, the cutting insert 50 is approached from the front end side of the insert pocket 11 of the main body 10. At this time, the rear portion 52 of the cutting insert 50 is directed toward the main body 10, and the up-and-down position of the cutting insert 50 is aligned with the main body 10 (see FIG. 6). Fig. 2 ).

[0066] Then, the cutting insert 50 is inserted into the accommodation groove portion 16 formed in the insert pocket 11 of the main body 10, and is accommodated between the lower jaw portion 13 and the upper jaw portion 15. In this way, the cutting insert 50 is elastically sandwiched and held in the accommodation groove portion 16, for which the groove width W1 of the front end side of the main body 10 is narrower than the groove width W2 of the rear end side. Furthermore, this state of holding is ultimately only a temporarily fixed state, and the holding force at this time is not a fixed force that can withstand the cutting force in cutting.

[0067] Next, the screw 75 is inserted into the through-hole 73 of the cutting insert 50, and the screw 75 is screwed into the threaded hole 18 of the lower jaw portion 13. At this time, the cutting insert 50 is held in the accommodation groove portion 16 of the insert pocket 11, and thus the tightening operation of the screw 75 can be performed without holding the cutting insert 50.

[0068] In this way, if the screw 75 inserted into the through-hole 73 of the cutting insert 50 is screwed into the threaded hole 18 of the lower jaw portion 13, the cutting insert 50 is fixed to the lower jaw portion 13 and mounted to the insert pocket 11 in a state where the seat surface 12 of the lower jaw portion 13 and the abutment surface 14 of the upper jaw portion 15 are in close contact.

[0069] Since the center axis CL2 of the through-hole 73 of the cutting insert 50 is offset to the front end side and the other side 10b of the main body 10 as compared with the center axis CL1 of the threaded hole 18, as described above, after the front abutment surface 81 abuts against the front limiting surface 21 of the insert pocket 11, the cutting insert 50 is retracted toward the rear of the main body 10 while sliding on the front limiting surface 21 toward the one side 10a of the main body 10. Thus, the cutting insert 50 is installed in the insert pocket 11 in a state where the front abutment surface 81 and the rear abutment surface 82 abut against the front limiting surface 21 and the rear limiting surface 22 of the insert pocket 11, respectively. Therefore, the cutting insert 50 is fixed to the insert pocket 11 without coming off with a high holding force. Moreover, the cutting insert 50 is installed on the main body 10 in a state where the center of the circumscribed circle R coincides with the center axis AX1 of the rotation of the main body 10.

[0070] Further, after the cutting insert 50 is installed in the insert pocket 11, the fluid groove 56 provided between the guide portions 54 and 55 of the cutting insert 50 communicates with the groove portion 31 of the main body 10.

[0071] In this way, in the cutting tool 100, the cutting insert 50 is installed in the insert pocket 11 of the main body 10, and the cooling liquid discharged through the discharge port 33 is delivered to the cutting site through the groove portion 31 and the fluid groove 56. Further, the cooling liquid discharged through the discharge port 34 is delivered to the cutting site through the groove portion 32. Therefore, the cutting insert 50 can be cooled and chips can be discharged by the cooling liquid.

[0072] Then, in the cutting tool 100, when a hole is processed in a workpiece, the rotational force generated in the cutting insert 50 is received by the seat surface 12 and the abutment surface 14 of the insert pocket 11 constituting the main body 10. Further, the pressing force toward the rear of the cutting insert 50 generated by pressing the cutting tool 100 is received by the front limiting surface 21 and the rear limiting surface 22 of the insert pocket 11 of the main body 10 which abut against the front abutment surface 81 and the rear abutment surface 82, respectively.

[0073] As described above, in the present embodiment, the cutting insert 50 has a function of the guide pad of the holder by including the two guide portions 54 and 55 which slide in contact with the inner surface of the processed hole, so that the number of components can be reduced. Thus, the thickness of the cutting insert 50 can be maintained to ensure sufficient strength, and the tool can be made small in diameter. Further, the cooling liquid can be delivered to the cutting site of the workpiece cut by the cutting edge 53 through the fluid groove 56.

[0074] Further, the distance L between the center O of the circumscribed circle R and the point P in the fluid groove 56 closest to the center O of the circumscribed circle R is greater than 1 / 4 of the diameter D of the circumscribed circle R. Therefore, by providing the fluid groove 56, it is possible to deliver the coolant to the cutting site of the work material and also maintain a necessary sufficient strength.

[0075] Further, the rear portion 52 has a through-hole 73 into which the screw 75 is inserted, and therefore the screw 75 can be inserted into the through-hole 73 and easily fastened and fixed to the main body 10.

[0076] Further, by abutting the front portion abutting surface 81, which is closer to the front side than the through-hole 73 and closer to the lower side than the bottom surface 71, against the front portion restricting surface 21 of the main body 10, it is possible to bear the cutting force F received by the cutting edge 53 when cutting the work material on the main body 10, and to moderate the stress imparted to the screw 75 when cutting.

[0077] With the main body 10 according to the present embodiment, the cutting blade 50 can be elastically clamped and held by the lower jaw portion 13 and the upper jaw portion 15 of the accommodation groove portion 16 that constitute the blade seat 11. Therefore, when performing the attachment and detachment operation of the cutting blade 50 with respect to the blade seat 11, it is not necessary to hold the cutting blade 50 by hand, and therefore the attachment and detachment operability of the cutting blade 50 can be improved. In particular, even if the diameter of the main body 10 is reduced in order to perform hole processing of a small diameter, the cutting blade 50 can be smoothly attached and detached from the blade seat 11 without falling off. Further, when viewed from the upper jaw portion 15 side, the threaded hole 18 of the lower jaw portion 13 is disposed at a position that does not coincide with the upper jaw portion 15 (see FIG. 6). Fig. 9 That is, the threaded hole 18 is formed only in the lower jaw portion 13, and the threaded hole 18 is threadedly connected to the screw 75 that fastens the cutting blade 50, and therefore it is possible to suppress a decrease in strength caused by forming a through-hole for screw insertion or a threaded hole for screw thread connection in the upper jaw portion 15.

[0078] In addition, in the main body 10 according to the present embodiment, the center axis CL1 of the threaded hole 18 is inclined with respect to the perpendicular PL1 of the seat surface 12 in the front view and the side view, and thus the number of threads in the threaded hole 18 can be increased. In particular, in the present embodiment, the center axis CL1 of the threaded hole 18 is inclined with respect to the perpendicular PL1 of the seat surface 12 in the front view of the main body 10 in such a manner that the center axis CL1 approaches the other side 10b from the one side 10a of the main body 10, and thus the number of threads in the threaded hole 18 can be further increased. As a result, the tightening force of the cutting insert 50 by the screw 75 can be increased. Therefore, even if the diameter of the main body 10 is reduced in order to perform hole machining with a small diameter, the tightening force of the cutting insert 50 by the screw 75 can be sufficiently obtained. In addition, in the side view, the center axis CL1 of the threaded hole 18 is inclined with respect to the perpendicular PL1 of the seat surface 12 in such a manner that the center axis CL1 is inclined toward the rear end side of the main body 10 in a direction away from the abutment surface 14, and thus the cutting insert 50 can be retracted toward the rear end side of the main body 10 when the cutting insert 50 is threadedly fixed. As a result, the front abutment surface 81 and the rear abutment surface 82 of the cutting insert 50 are firmly abutted against and fixed to the front limiting surface 21 and the rear limiting surface 22 of the insert pocket 11 of the main body 10, respectively, without being loosened, and thus stable cutting can be performed.

[0079] Further, the present disclosure is not limited to the above-described specific examples, and design changes can be appropriately added by those skilled in the art, and as long as the features of the present disclosure are possessed, they are included in the scope of the present disclosure. The elements, configurations, conditions, shapes, and the like possessed by each of the above-described specific examples are not limited to the illustrated content, and can be appropriately changed. Each element possessed by each of the above-described specific examples can be appropriately changed in combination as long as no technical contradiction occurs.

[0080] Explanation of Main Element Symbols

[0081] Main body 10

[0082] Insert pocket 11

[0083] Seat surface 12

[0084] Lower jaw portion 13

[0085] Abutment surface 14

[0086] Upper jaw portion 15

[0087] Accommodation groove portion 16

[0088] Threaded hole 18

[0089] Cutting insert 50

[0090] Cutting tool 100

[0091] Rotational center axis AX1

[0092] central axis CL1

[0093] perpendicular PL1

[0094] center O of the circumscribed circle

[0095] circumscribed circle R

[0096] slot width W1, W2.

Claims

1. A body having a blade pocket in which a cutting blade is mounted, wherein, The insert pocket has: a lower jaw portion having a threaded hole; an upper jaw portion disposed apart from the lower jaw portion; a receiving groove portion formed between the lower jaw portion and the upper jaw portion and into which the cutting insert is inserted, wherein a groove width of a front end side of the receiving groove portion is narrower than a groove width of a rear end side.

2. The body of claim 1, wherein, When viewed from above the upper jaw portion side, the threaded hole is disposed at a position that does not coincide with the upper jaw portion.

3. The body of claim 1, wherein, The threaded hole has a central axis that is inclined with respect to a perpendicular line of a seating surface in the lower jaw portion that abuts against the cutting insert.

4. The body of claim 3, wherein, When viewed in elevation, the central axis of the threaded hole is inclined with respect to the perpendicular line of the seating surface in a manner that approaches from one side of the main body toward the other side.

5. The body of claim 3, wherein, When viewed in side elevation, the central axis of the threaded hole is inclined with respect to the perpendicular line of the seating surface toward the rear end side in a direction away from an abutting surface in the upper jaw portion that abuts against the cutting insert.

6. A cutting tool, wherein, The cutting tool includes: the main body according to any one of claims 1 to 5; and a cutting insert that is mounted to the insert pocket of the main body.

7. The cutting tool of claim 6, wherein, The cutting insert is mounted to the insert pocket of the main body in a state in which a center of an inscribed circle when the cutting insert is viewed in elevation coincides with a central axis of rotation of the main body.

Images