JP2019025603A - Tool body and cutting tool - Google Patents

Abstract

To provide a cutting tool which can jet fluid without using a hose.SOLUTION: A tool body includes: a head part for arranging a cutting edge; and a substantially quadrangular cylindrical shaped shank part extending in a longitudinal direction from the head part. The tool body further includes: a fluid jetting port for jetting fluid; a fluid flow passage connected to the fluid jetting port; and a fluid supply port connected to the fluid flow passage. The fluid supply port is opened to a shank side face extending in a longitudinal direction of the shank part. The fluid flow passage includes an enlarged diameter part in which cross sectional area is increased toward the fluid supply port. The shank side face has a flat part surrounding the fluid supply port. Surface roughness Ra of the flat part is 0.01 μm or more and 0.8 μm or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting tool used for cutting and a tool body thereof.

  The tool shown in Patent Document 1 includes a cutter insert and a holder. The holder includes a head portion on which a cutter (cutting edge) is disposed, and a quadrangular prism-shaped shank portion extending in the longitudinal direction from the head portion. The holder has a coolant outlet, a coolant channel connected to the coolant outlet, and a supply port connected to the coolant channel. The supply port opens in the end surface 30a of the shank part on the opposite side to the workpiece. There are several options for the supply port. The supply port when not in use is closed by a closing part (screw). A supply component 68b is connected to the supply port, and a hose or the like is connected to the supply component.

Special table 2014-509563 gazette

  The tool shown in Patent Document 1 uses a hose to supply fluid (coolant) to the supply port. For this reason, a hose is arranged inside the machine tool. The hose is arranged inside the machine tool, so that chips may be wound around the hose. In addition, chips may damage the hose. For this reason, the cutting tool which can supply a fluid directly from a tool post, without using a hose was desired.

  The tool body of the present invention is a tool body having a head part for arranging a cutting edge and a substantially quadrangular prism-shaped shank part extending in the longitudinal direction from the head part, and a fluid jet port for ejecting fluid And a fluid channel connected to the fluid ejection port and a fluid supply port connected to the fluid channel. The fluid supply port opens on the side surface of the shank extending in the longitudinal direction of the shank portion. The fluid flow path includes an enlarged diameter portion whose cross-sectional area increases toward the fluid supply port. The shank side surface has a flat portion surrounding the fluid supply port. The surface roughness Ra of the flat portion is 0.01 μm or more and 0.8 μm or less.

  The cutting tool of the present invention has the tool body of the present invention.

It is a perspective view of the cutting tool which concerns on 1st Embodiment. It is the perspective view which showed the internal structure of the cutting tool of FIG. 1 with the hidden line (broken line). It is a right view of the state which removed the cutting insert and the clamp member from the cutting tool of FIG. It is a top view of the cutting tool of FIG. It is a perspective view of the cutting tool which concerns on 2nd Embodiment. It is a right view of the state which removed the cutting insert and the clamp member from the cutting tool of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratio is not limited to the illustrated ratio. The following embodiments are examples for explaining the present invention, and the present invention is not limited to these embodiments.

  FIG. 1 is a perspective view showing a cutting tool 1 according to a first embodiment of the present invention. FIG. 2 is a diagram showing hidden lines (broken lines) so that the internal structure of the cutting tool 1 can be understood. The cutting tool 1 according to this embodiment is a lathe tool having a cutting insert 40.

  As shown in FIGS. 1 and 4, the cutting tool 1 uses a clamp member (clamping screw) 50 to fix the cutting insert 40 to the tool body 10.

  The cutting insert 40 has a cutting edge 41. The cutting insert 40 has a through hole for clamping to the insert seat 25 of the tool body 10. The cutting insert 40 has a substantially polygonal plate shape. That is, the cutting insert 40 has two substantially polygonal end surfaces and a peripheral side surface connecting these end surfaces. The end face of the cutting insert 40 according to this embodiment is a substantially rhombus having apex angles of 55 ° and 125 °. Of at least one end face of the cutting insert 40, a portion connected to the cutting edge 41 functions as a rake face. The peripheral side surface portion connected to the cutting edge 41 functions as a flank surface. In addition, the shape of the cutting insert 40 is not limited to a substantially rhombus, and various shapes are known. Since the shape of the cutting insert 40 is not limited in applying the present invention, a detailed description of the cutting insert 40 is omitted here.

  The tool body 10 has a head portion 11 and a shank portion 12. The head part 11 and the shank part 12 are connected by a connection part 13. However, the tool body 10 according to this embodiment does not have a portion that gradually changes in the connecting portion 13, and it can be seen that the head portion 11 and the shank portion 12 are directly connected. As shown in FIG. 3, the tool body 10 has an insert seat 25 in the head portion 11 for removably receiving the cutting insert 40. As shown in FIGS. 1 to 4, the shank portion 12 has a substantially quadrangular prism shape. As shown in FIGS. 3 and 4, the longitudinal direction L is determined with respect to the shank portion 12. That is, the shank portion 12 extends from the head portion 11 in the longitudinal direction L.

  The tool body 10 has a head end surface 20 on the head portion 11 side, a shank end surface 14 on the shank portion 12 side, and a side surface connecting them. The head end surface 20 can also be referred to as a front end surface. The shank end face 14 can also be referred to as a rear end face. Here, the side surface corresponding to the rake face of the cutting insert 40 is referred to as the upper surface, and the side surface corresponding to the flank face of the cutting insert 40 is referred to as the right side surface. Further, a side surface facing the upper surface is referred to as a lower surface, and a side surface facing the right side surface is referred to as a left side surface. The right side surface of the head portion 11 is referred to as a first head side surface 21, and the right side surface of the shank portion 12 is referred to as a first shank side surface 15. Hereinafter, similarly, the upper surface of the head portion 11 is referred to as a second head side surface 22, the upper surface of the shank portion 12 is referred to as a second shank side surface 16, and the left side surface of the head portion 11 is referred to as a third head side surface 23. The left side surface of the shank portion 12 is referred to as a third shank side surface 17, the lower surface of the head portion 11 is referred to as a fourth head side surface 24, and the lower surface of the shank portion 12 is referred to as a fourth shank side surface 18. Call it. The dimension from the head end surface 20 to the shank end surface 14 of the cutting tool 1 according to this embodiment is about 120 mm. The dimension F from the first shank side 15 to the third shank side 17 is about 12 mm. The dimension from the first shank side surface 15 to the third shank side surface 17 can also be referred to as the height F of the shank portion 12. The height direction coincides with the direction orthogonal to the second shank side surface 16 (upper surface). That is, the height F of the shank portion 12 coincides with the height F of the first shank side surface 15 in the direction orthogonal to the second shank side surface 16. The dimension from the second shank side 16 to the fourth shank side 18 is about 12 mm. That is, the shank part 12 is about 12 mm square.

  As described above, the head portion 11 and the shank portion 12 are connected by the connection portion 13. Therefore, the first shank side surface 15 is connected to the first head side surface 21 by the connecting portion 13. Similarly, the second shank side face 16 is connected to the second head side face 22 at the connection portion 13, the third shank side face 17 is connected to the third head side face 23 at the connection portion 13, and the fourth shank side face is connected. 18 is connected to the fourth head side surface 24 by the connecting portion 13.

  The corner portion of the shank portion 12 has a chamfered surface. That is, the intersecting ridge line portion between the first shank side surface 15 and the second shank side surface 16 has a chamfered surface 35. Similarly, the intersection ridge line portion between the second shank side surface 16 and the third shank side surface 17 has a chamfered surface 35, and the intersection ridge line portion between the third shank side surface 17 and the fourth shank side surface 18 is chamfered surface. 35, and the intersection ridge line portion between the first shank side surface 15 and the fourth shank side surface 18 has a chamfered surface 35. These chamfered surfaces 35 can also be referred to as shank chamfered surfaces 35. Furthermore, the intersection ridge line portion between the shank end surface 14 and the first shank side surface 15 has a chamfered surface. Similarly, the intersecting ridge line portion between the shank end surface 14 and the second shank side surface 16 has a chamfered surface, the intersecting ridge line portion between the shank end surface 14 and the third shank side surface 17 has a chamfered surface, and the shank end surface 14 And the fourth shank side surface 18 have a chamfered surface. The shank chamfered surface 35 of the cutting tool 1 according to this embodiment has a width of about 0.5 mm when viewed from the direction facing the first shank side surface 15. Similarly, the width of all chamfered surfaces of the shank portion 12 is about 0.5 mm.

  A cutting insert 40 having a cutting edge 41 is disposed on the head portion 11 of the tool body 10. That is, the tool body 10 has the head portion 11 for arranging the cutting edge 41, the head portion 11 has the insert seat 25, and the cutting insert 40 is detachably mounted on the insert seat 25. The cutting edge 41 is disposed at a position corresponding to the intersecting ridge line portion between the second head side surface 22 and the first head side surface 21 of the tool body 10. That is, when the cutting insert 40 is used, the rake face of the cutting insert 40 is regarded as a part of the second head side face 22, and a part corresponding to a part of the flank face of the cutting insert 40 is a part of the first head side face 21. It is considered.

  The cutting edge 41 is also disposed at a position corresponding to the intersecting ridge line portion between the second head side surface 22 and the head end surface 20 of the tool body 10. In other words, the second head side surface 22 and the first head side surface 21 are determined so as to correspond to the position where the cutting edge 41 is disposed.

  A nozzle member 31 is attached to the second head side surface 22. The nozzle member 31 has a fluid ejection port 26. The cutting tool 1 according to this embodiment also has a fluid ejection port 26 in the vicinity of the intersecting ridge line portion between the head end surface 20 and the first head side surface 21. Here, the fluid outlet 26 provided in the nozzle member 31 is referred to as a first fluid outlet 26a, and the fluid outlet 26 provided on the head end surface 20 side is referred to as a second fluid outlet 26b. To do. The first fluid ejection port 26 a ejects a fluid such as coolant, mist, or air from the rake face side toward the cutting edge 41. The second fluid ejection port 26b ejects a fluid such as coolant, mist or air from the flank face toward the cutting edge 41.

  A fluid flow path 27 is connected to each fluid outlet 26. A fluid supply port 28 is connected to the fluid flow path 27. That is, the fluid supply port 28 and each fluid ejection port 26 are connected by the fluid flow path 27. Since the cutting tool 1 according to this embodiment has two fluid ejection ports 26, the fluid flow path 27 is branched into two paths on the way. A part of the branched fluid flow path 27 passes through the inside of the nozzle member 31. That is, a part of the fluid flow path 27 extends from the second head side surface 22 to the nozzle member 31. The nozzle member 31 is pressed against the second head side surface 22 by a fixing member (screw) so that the nozzle member 31 does not move during cutting and fluid does not leak out. In addition, in order to make formation by the drilling etc. easy, the fluid flow path 27 can also be plugged with the plug 32 etc. after making a hole once. The cutting tool 1 according to this embodiment closes the unused portion of the fluid flow path 27 using the two plugs 32. The plug 32 can also be called a male screw part or a closing member. However, since the plug 32 does not need to be attached or detached, it is not limited to a male screw part. Any plug may be used as long as the fluid can be blocked so as not to leak.

  As shown in FIGS. 1 to 3, the fluid supply port 28 opens to the first shank side surface 15. As shown in FIG. 3, the shape of the fluid supply port 28 is substantially circular when viewed from the direction facing the first shank side 15. The diameter D of the opening of the fluid supply port 28 is about 5 mm. As shown in FIG. 3, when the direction perpendicular to the second shank side surface (upper surface) 16 is the height direction, the height A of the opening of the fluid supply port 28 is about 5 mm. The center of the fluid supply port 28 is at a position of about 6 mm from the fourth shank side surface (lower surface) 18. Therefore, the distance E1 from the fourth shank side surface 18 to the fluid supply port 28 is about 3.5 mm. Also. The center of the fluid supply port 28 is located about 6 mm from the second shank side face 16. A distance E2 from the second shank side face 16 to the fluid supply port 28 is about 3.5 mm. The fluid supply port 28 is disposed at the center between the second shank side face 16 and the fourth shank side face 18.

  As shown in FIG. 3, the outermost end 19 of the head portion 11 on the opposite side of the shank portion 12 of the tool body 10 in the longitudinal direction L is defined as viewed from the direction facing the first shank side surface 15. The minimum dimension C in the longitudinal direction L from the outermost end 19 to the fluid supply port 28 is about 70 mm.

  The fluid flow path 27 has an enlarged diameter portion 27 a in the vicinity of the fluid supply port 28. The enlarged diameter portion 27 a increases the cross-sectional area of the fluid flow path 27 as it goes toward the fluid supply port 28. The enlarged diameter portion 27a of the cutting tool 1 according to this embodiment is a chamfered surface. The chamfered width of the enlarged diameter portion 27a is about 0.5 mm.

  The fluid flow path 27 has a female thread portion 31 in the vicinity of the fluid supply port 28. However, in FIGS. 1 to 3, the thread shape of the female thread portion 31 is omitted, and is simply illustrated. The actual cutting tool 1 is formed with a female thread. When the fluid supply port 28 is not used, the female thread portion 31 can block a part of the fluid flow path 27 with a male screw member (not shown). The male screw member to be closed may have a shape similar to that of the above-described plug 32 and a conventional type male screw member 34 described later, and may have a different shape so as to engage with the female screw portion 31. That is, the external thread member engaged with the internal thread portion 31 may be a hexagon socket set screw.

  The cutting tool 1 has a flat surface 29 so as to surround the fluid supply port 28. In the cutting tool 1 according to this embodiment, the entire surface of the first shank side surface 15 functions as the flat surface 29. The surface roughness of the flat surface 29 of the cutting tool 1 according to this embodiment is about 0.5 μm. Here, the surface roughness is the arithmetic average roughness Ra (JIS B 0601: 2013).

  In the cutting tool 1 according to this embodiment, the entire flat surface portion of the first shank side surface 15 functions as the flat surface 29. That is, the minimum value of the width of the flat surface 29 is a dimension obtained by subtracting the width of the shank chamfered surface 35 from the distances E1 and E2 from the fourth shank side surface 18 or the second shank side surface 16 to the fluid supply port 28. , About 3 mm.

  The cutting tool 1 according to this embodiment has two conventional fluid supply ports 33 to which a hose or the like can be connected, like a cutting tool of the prior art. As shown in FIG. 2, one type of conventional fluid supply port 33 is opened on each of the shank end surface 14 and the third shank side surface 17. The fluid flow path 27 has a junction where the fluid flow path from the fluid supply port 28 and the fluid flow path from the conventional fluid supply port 33 merge. Since there are two conventional fluid supply ports 33, there are also two merging points. The fluid flow path 27 has respective female screw portions around the conventional fluid supply port 33 and is closed by a conventional male screw member 34. When using the conventional fluid supply port 33, the conventional screw member 34 is removed. The female thread portion may be engaged with a connecting member for connecting a hose or the like. When the conventional type fluid supply port 33 is used, the fluid flow path 27 from the fluid supply port 28 is closed by the male screw member as described above.

  Next, a cutting tool 100 according to the second embodiment will be described. The description of the cutting tool 100 will explain the main differences from the cutting tool 1 according to the first embodiment, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

  5 and 6 show the shape of the cutting tool 100. FIG. The cutting tool 100 uses a clamp member (screw) 50 to fix the cutting insert 40 to the tool body 110.

  The cutting insert 40 has a cutting edge 41. The tool body 110 has a head portion 11 and a shank portion 12. The cutting edge 41 of the cutting insert 40 is disposed at a position corresponding to an intersecting ridge line portion between the second head side surface 22 and the first head side surface 21 of the tool body 110. Further, the cutting edge 41 is also disposed at a position corresponding to the intersecting ridge line portion between the second head side surface 22 and the head end surface 20 of the tool body 110.

  The fluid supply port 111 is open to the first shank side surface 15. As shown in FIG. 6, the shape of the opening of the fluid supply port 111 is substantially oval when viewed from the direction facing the first shank side 15. In other words, the fluid flow path 27 has a substantially elongated recess 112 in the vicinity of the fluid supply port 111. Assuming that the direction orthogonal to the second shank side surface (upper surface) 16 is the height direction, the height A2 of the opening of the fluid supply port 111 is about 6 mm. When the width direction is a direction orthogonal to the height direction when viewed from the direction facing the first shank side surface 15, the width B of the opening of the fluid supply port 111 is about 30 mm.

  The material around the cutting edge 41 of the cutting tools 1 and 100 is not particularly limited. For example, hard materials such as cemented carbide, cermet, ceramics, and sintered body containing cubic boron nitride, and these hard materials It is preferable to select from among those obtained by coating a PVD or CVD coating film on the surface, single crystal diamond or a sintered body containing diamond.

  The tool bodies 10 and 110 configured as described above are manufactured as follows. First, the outer shape of the tool bodies 10 and 110 is cut. Next, the shape of the insert seat 25 is cut. At this time, a hole or a screw shape for mounting the nozzle member 31 may be simultaneously cut. Next, the fluid flow path 27 is cut with a drill or the like. Next, the enlarged diameter portion 27 a and the female screw portion 31 are cut into a part of the fluid flow path 27. As in the case of the tool body 110, when the shape of the opening of the fluid supply port 111 is made to be a substantially oval shape, cutting is performed. Finally, a screw member is screwed into the female thread portion 31 to close a part of the fluid flow path 27. At this time, if there is a portion blocked by the plug 32 or the conventional type male screw member 34, all the portions are blocked.

  The cutting insert 40 of the cutting tools 1 and 100 is attached to the tool bodies 10 and 110 by inserting a clamping member (clamping screw) into the hole and tightening with the clamping screw as shown in FIG. The method for fixing the cutting insert 40 is not particularly limited, and the cutting insert 40 may be fixed by a pressing piece or a wedge. At the time of lathe processing, an object to be cut is fixed to a lathe chuck and rotated, for example, around a horizontal axis. Then, the cutting edge 41 side of the cutting tools 1 and 100 is brought close to the workpiece, and the workpiece is cut by the cutting edge 41.

  Next, the operation and effect of the cutting tools 1 and 100 according to these embodiments will be described. Moreover, the preferable form of this invention is also demonstrated.

  The cutting tools 1 and 100 are suitable for lathe processing. The cutting tools 1 and 100 according to the embodiment both use the substantially rhomboid cutting insert 40 having apex angles of 55 ° and 125 °, but is not limited thereto. The present invention can also be applied to cutting tools for parting and grooving and threading. However, the present invention is particularly suitable for a cutting tool for a small lathe with a small space in the machine. For example, it is particularly suitable for a cutting tool for small lathes called automatic lathes. For a small lathe with a small space in the machine, if a hose is installed in the machine, problems due to contact between chips and the hose are likely to occur. Therefore, a connection method that does not use a hose is preferable.

  In order to attach the cutting tools 1 and 100 of the present invention to a tool post of a lathe without using a hose, a tool post opening (not shown) of the tool post fluid flow path corresponding to the fluid supply ports 28 and 111 is provided. Use a lathe on the tool post. Here, the description of the configuration on the machine tool side is omitted. The machine tool side only needs to have the tool post opening of the tool post fluid flow path at the corresponding position of the tool post.

  The cutting tools 1 and 100 function when the fluid supply ports 28 and 111 are directly connected to the tool post opening. That is, the fluid supply ports 28 and 111 of the cutting tools 1 and 100 function by being aligned with the tool post opening and sealed so that fluid does not leak. In order to seal the fluid so that it does not leak, for example, it is conceivable to close the gap with a seal or the like. However, when a seal or the like is used, fluid may leak due to the deterioration of the seal. Further, a cutting tool for a small lathe generally has a thin shank portion. For example, if the direction perpendicular to the second shank side surface (upper surface) 16 is the height direction, a cutting tool having a height (F) of the first shank side surface 15 of 8 mm or more and 20 mm or less is used. For this reason, there is little space for arranging a seal or the like, and it is difficult to obtain a sufficient sealing effect. Further, the seal may fall off when the cutting tools 1 and 100 are repeatedly attached to and detached from the tool post. The cutting tools 1 and 100 of the present invention can prevent the fluid from leaking by having the flat portion 29 around the fluid supply ports 28 and 111 without using a seal or the like.

  The surface roughness Ra of the flat portion 29 is preferably 0.01 μm or more and 0.8 μm or less. The flat portion 29 is in close contact with the tool post of the lathe and has a surface roughness Ra that prevents fluid from leaking out. If the surface roughness Ra exceeds 0.8 μm, for example, the fluid pressure may be about 5 MPa, and the fluid may leak. The lower limit value of the surface roughness Ra of the flat portion 29 is not limited when used, but if the surface roughness of the flat portion 29 is less than 0.01 μm, the manufacturing cost may increase.

  About the dimension of the flat part 29, let the direction orthogonal to the 2nd shank side surface (upper surface) 16 be a height direction. The minimum values of the heights E1 and E2 from the fluid supply ports 28 and 111 of the flat portion 29 are preferably 0.5 mm or more and 10 mm or less. When the minimum value of the width of the flat portion 29 from the fluid supply ports 28 and 111 is less than 0.5 mm, the width of the flat portion 29 is insufficient. For example, the fluid may leak when the fluid pressure is about 5 MPa. . The upper limit value of the minimum value of the heights E1 and E2 of the flat portion 29 is not limited when it is used, but the wide flat portion 29 in which the minimum values of the heights E1 and E2 exceed 10 mm can be obtained with high accuracy. If the surface roughness Ra is used, the manufacturing cost may increase.

  The minimum value of the heights E1 and E2 from the fluid supply ports 28 and 111 of the flat portion 29 is preferably 20% or more and 48% or less with respect to the height F of the first shank side surface 15. When the ratio of the width from the fluid supply ports 28 and 111 of the flat portion 29 is less than 20%, the width of the flat portion 29 is insufficient. For example, when the fluid pressure is about 5 MPa, the fluid may leak out. is there. The upper limit of the minimum value of the ratio of the height of the flat portion 29 is not limited when it is used. However, when the wide flat portion 29 having a ratio exceeding 48% is formed with the above-described surface roughness Ra with high accuracy. Manufacturing costs may increase. The minimum value of the heights E1 and E2 is more preferably 25% or more and 40% or less with respect to the height F of the first shank side face 15.

  When using for a small lathe, the height (F) of the 1st shank side surface (15) of the cutting tools 1 and 100 has preferable 8 mm or more and 20 mm or less. Furthermore, the shank portion 12 preferably has a square cross-sectional shape of 8 mm square or more and 20 mm square or less.

  The heights A and A2 of the openings of the fluid supply ports 28 and 111 are preferably 1 mm or more and 10 mm or less. When the heights A and A2 are less than 1 mm, the fluid flow rate tends to be insufficient, and it is difficult to supply a sufficient amount of fluid. When the heights A and A2 exceed 10 mm, for example, it is difficult to apply to a cutting tool in which the height F of the first shank side surface 15 is 12 mm or less.

  The fluid supply ports 28 and 111 are preferably selected from a substantially circular shape, a substantially oval shape, and a substantially oval shape. When the fluid supply ports 28 and 111 are substantially circular, the required area of the surrounding flat portion 29 can be reduced, and the flat portion 29 can be easily formed with high accuracy. On the other hand, when the fluid supply ports 28 and 111 are selected from a substantially oval shape and a substantially oval shape, it becomes easy to adjust the protruding length of the cutting tools 1 and 100 with respect to the tool rest. Although not shown, it is easy to adjust the protruding length of the cutting tool with respect to the tool rest by arranging a plurality of fluid supply ports 28. Although not shown, the protruding length of the cutting tools 1 and 100 can also be increased by making the tool post opening of the tool post fluid flow path on the tool post side a shape selected from a substantially oval shape and a substantially oval shape. It becomes easy to adjust with respect to the tool post. In the cutting tool 1 according to the first embodiment of the present invention, when the tool post opening has a substantially oval shape, the protruding length of the cutting tool 1 is set to the tool post even if the fluid supply port 28 is substantially circular. Can be adjusted. Further, since the flat portion 29 is sufficiently wide in the longitudinal direction L, the entire substantially oval shape of the tool post opening can be sealed.

  When the fluid supply port 28 is substantially circular, the diameter D of the opening of the fluid supply port 28 is preferably 1 mm or greater and 5.1 mm or less. When the diameter D is less than 1 mm, the flow rate of the fluid tends to be insufficient, and it is difficult to supply a sufficient amount of fluid. When the diameter D exceeds 5.1 mm, the manufacturing cost of cutting with a drill may increase.

  The fluid flow path 27 has a diameter-expanded portion 27a whose cross-sectional area increases toward the fluid supply ports 28 and 111. For this reason, the cross-sectional area of the fluid supply ports 28 and 111 can be made larger than the cross-sectional area of the entire fluid flow path 27. Therefore, it becomes easy to match the shape (cross-sectional area) of the fluid supply ports 28 and 111 with the shape (cross-sectional area) of the tool post fluid channel on the tool post side. In addition, for example, when the overall cross-sectional area of the fluid flow path 27 is set to be approximately the same as the cross-sectional area of the tool rest fluid flow path, a slight error in the mounting position when the cutting tool 1 is mounted is absorbed. The cutting tools 1 and 100 can be mounted so that a portion having a smaller cross-sectional area than the cross-sectional area of the pedestal fluid flow path does not occur on the flow path.

  The enlarged diameter portion 27a is preferably a chamfered surface. The chamfer width of the enlarged diameter portion 27a is preferably 0.2 mm or more and 2 mm or less. The chamfered surface can be easily provided in a part of the fluid flow path 27 by, for example, cutting. When the chamfered width of the enlarged diameter portion 27a is less than 0.2 mm, it becomes difficult to absorb an error in the mounting position when the cutting tool 1 is mounted. The upper limit value of the chamfer width of the enlarged diameter portion 27a is not limited in use, but if it exceeds 2 mm, the heights A and A2 of the opening portion increase. For example, the height of the first shank side surface 15 It may be difficult to apply to a cutting tool having F of 12 mm or less.

  Since the fluid flow path 27 has the recess 112 in the fluid supply port 111, in addition to adjusting the protruding length of the cutting tool 1, the fluid flow path 27 absorbs some errors in the mounting position when the cutting tool 1 is mounted, and the tool post The cutting tool 100 can be mounted so that a portion having a smaller cross-sectional area than the cross-sectional area of the fluid flow path does not occur on the flow path. It is preferable that the opening of the fluid supply port 111 completely covers the tool post opening of the tool post fluid flow path of the tool post. That is, the height A2 of the opening of the fluid supply port 111 is preferably larger than the height of the tool post opening, and the width B of the opening of the fluid supply port 111 is larger than the width of the tool post opening. Is preferred.

  In the longitudinal direction L, the fluid supply ports 28 and 111 preferably have a minimum dimension C of 60 mm or more and 95 mm or less from the outermost end 19 of the head portion 11. In particular, when the installed lathe is a small lathe called an automatic lathe, it is preferable that the minimum dimension C is 60 mm or more and 95 mm or less. If the minimum dimension C is less than 60 mm, the fluid may easily leak due to the aging of the tool post. When the minimum dimension C exceeds 95 mm, it may be difficult to mount on a small lathe called an automatic lathe.

  It is preferable that the fluid supply ports 28 and 111 open on the first shank side surface 15. In particular, in the case of a small lathe cutting tool called an automatic lathe, it is preferable to open the first shank side 15 corresponding to the flank side. When the fluid supply ports 28 and 111 are opened in the first shank side surface 15, the flat portion 29 is brought into close contact with the tool post when the cutting tool 1 is mounted in a conventional direction on a comb tool post or the like. Pressed.

  The intersecting ridge line portion between the first shank side surface 15 and the second shank side surface 16 preferably has a shank chamfered surface 35. The intersecting ridge line portion between the first shank side surface 15 and the fourth shank side surface 18 preferably has a shank chamfered surface 35. When the direction orthogonal to the second shank side surface 16 is the height direction, the height of the shank chamfered surface 35 is preferably 0.2 mm or more and 2 mm or less. When the shank chamfered surface 35 is formed in such a shape, it becomes easy to make the flat surface 29 firmly adhere to the tool post. More preferably, all corners of the shank portion 12 have chamfered surfaces. It should be noted that all the chamfered surfaces are not limited to the same width. The width of the chamfered surface may vary depending on the location.

  The fluid ejection port 26 is preferably open to at least one of the second head side surface 22, the first head side surface 21, and the head end surface 20. In particular, it is preferable that at least one fluid ejection port 26 is opened on the second head side surface 22 and further opened on one of the first head side surface 21 and the head end surface 20. When the fluid ejection port 26 is arranged in this manner, the fluid can be efficiently ejected from the vicinity of the cutting edge 41, so that the cutting performance can be improved.

  As mentioned above, although embodiment of this invention was described, the cutting tool of this invention can be variously changed. For example, in the above-described embodiment, the substantially diamond-shaped cutting insert 40 is used, but the present invention is not limited to this and can be applied to various forms.

  The cutting tool of the present invention is not limited to a cutting tool using a cutting insert. The present invention can also be applied to a cutting tool in which a chip is brazed or an integral type cutting tool.

  Although the present invention has been described with a certain degree of specificity in the above-described embodiments, the present invention is not limited to this. It should be understood that various changes and modifications can be made to the present invention without departing from the spirit and scope of the claimed invention. That is, the present invention includes all modifications, applications, and equivalents included in the concept of the present invention defined by the claims.

DESCRIPTION OF SYMBOLS 1 Cutting tool 10 which concerns on 1st Embodiment Tool body 11 Head part 12 Shank part 13 Connection part 14 Shank end surface (rear end surface)
15 First shank side (right side)
16 Second shank side (top)
17 Third shank side (left side)
18 Fourth shank side (bottom)
19 Outermost end of head 20 Head end face (front end face)
21 Side of first head (right side)
22 Second head side surface (upper surface)
23 Third head side (left side)
24 Fourth head side surface (lower surface)
25 Insert seat 26 Fluid ejection port 26a 1st ejection port 26b 2nd ejection port 27 Fluid flow path 27a Expanded diameter portion (chamfered surface)
28 Fluid supply port 29 Flat portion 30 Female thread portion 31 Nozzle member 32 Filler plug 33 Conventional type fluid supply port 34 Conventional type plug 35 Shank chamfered surface 40 Cutting insert 41 Cutting blade 50 Clamp member (clamping screw)
100 Cutting Tool 110 according to Second Embodiment Tool Body 111 according to Second Embodiment Fluid Supply Port (Elongated Hole)
112 Concave part A, A2 Fluid supply port height B Fluid supply port width C, C2 Minimum dimension to fluid supply port D Fluid supply port diameter E1, E2, E3, E4 Flat part height F, F2 Shank part Height L longitudinal direction

Claims (14)

A tool body (10) having a head part (11) for disposing the cutting edge (41) and a substantially quadrangular prism-shaped shank part (12) extending from the head part (11) in the longitudinal direction (L). 110), and
A fluid ejection port (26) for ejecting fluid, a fluid channel (27) connected to the fluid ejection port (26), and a fluid supply port (28, 111) connected to the fluid channel (27) Have
The fluid supply ports (28, 111) open to a shank side surface (15) extending in the longitudinal direction (L) of the shank portion (12),
The fluid flow path (27) includes an enlarged diameter portion (27a) having a cross-sectional area that increases toward the fluid supply port (28, 111),
The shank side surface (15) has a flat portion (29) surrounding the fluid supply port (28, 111),
The tool body whose surface roughness (Ra) of the flat part (29) is 0.01 μm or more and 0.8 μm or less. The enlarged diameter portion (27a) is a chamfered surface,
The tool body according to claim 1, wherein the chamfered width of the enlarged diameter portion (27a) is not less than 0.2 mm and not more than 2 mm. The shank portion (12) has a second shank side surface (16) intersecting the shank side surface (15),
The head portion (11) includes a first head side surface (21) connected to the shank side surface (15), a second head side surface (22) connected to the second shank side surface (16), and A head end surface (20) facing away from the shank portion (12),
The cutting edge (41) includes an intersecting ridge line portion between the second head side surface (22) and the first head side surface (21), and the second head side surface (22) and the head end surface (20). The tool body according to claim 1, wherein the tool body is disposed on at least one of the intersecting ridge lines. A rake face is disposed on the second head side face (22) side, and a flank face is disposed on at least one side of the first head side face (21) side and the head end face (20) side,
The tool body according to claim 3, wherein the fluid ejection port (26) opens in at least one of the second head side surface (22), the first head side surface (21), and the head end surface (20). . With respect to the dimension of the opening of the fluid supply port (28, 111), when the direction perpendicular to the second shank side surface (16) is the height direction, the height of the opening of the fluid supply port (28, 111) is (A, A2) is 1 mm or more and 10 mm or less,
The tool body according to claim 3 or 4, wherein a height (F) of the first shank side surface (15) is not less than 8 mm and not more than 20 mm. A shank chamfered surface (35) at the intersection ridgeline between the shank side surface (15) and the second shank side surface (16);
6. The height of the shank chamfered surface (35) is 0.2 mm or more and 2 mm or less, assuming that the direction orthogonal to the second shank side surface (16) is the height direction. 6. The tool body described in 1.   When the direction orthogonal to the second shank side surface (16) is the height direction, the minimum value of the height (E1, E2) of the flat portion (29) from the fluid supply port (28, 111) is: The tool body according to any one of claims 3 to 6, which is 20% or more and 48% or less with respect to a height (F) of the first shank side face (15).   The minimum value of the height (E1, E2) of the flat portion (29) is 25% or more and 40% or less with respect to the height (F) of the first shank side surface (15). The tool body described. When viewed from the direction facing the shank side surface (15), the fluid supply port (28) has a substantially circular shape,
The tool body (10) according to any one of claims 1 to 8, wherein a diameter (D) of the fluid supply port (28) is not less than 1 mm and not more than 5.1 mm.   The tool body according to any one of claims 1 to 8, wherein the fluid supply port (111) is selected from a substantially oval shape and a substantially oval shape when viewed from a direction facing the shank side surface (15). (110).   The outermost end (19) of the head portion (11) on the opposite side to the shank portion (12) in the longitudinal direction (L) when viewed from the direction facing the shank side surface (15). The tool body according to any one of claims 1 to 10, wherein a minimum dimension (C) in the longitudinal direction (L) from (19) to the fluid supply port (28, 111) is 60 mm or more and 95 mm or less. . The fluid flow path (27) has a female thread portion (31) adjacent to the fluid supply port (28, 111),
The tool body according to any one of claims 1 to 11, which can be closed when the fluid supply port (28, 111) is not used by using a male screw part. The tool body (10, 110) of a cutting tool (1, 100) using a cutting insert (40),
The tool body according to any one of claims 1 to 12, wherein the head portion (11) has an insert seat (25) to which the cutting insert (40) can be detachably attached.   A cutting tool comprising the tool body (10, 110) according to any one of the preceding claims.

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