JP6071924B2 - Cutting rotary tool - Google Patents

Description

  The present invention relates to a cutting rotary tool used in a machine tool, and more particularly to a cutting rotary tool that includes a plurality of cutting edges and simultaneously forms a plurality of step shapes on a workpiece.

  Patent Document 1 discloses a cutting tool that reduces the cutting resistance by changing the shape of the cutting blade. In addition, a cutting rotary tool that processes a plurality of step shapes on a workpiece has a plurality of step portions corresponding to the plurality of steps to be processed on the workpiece, and a cutting blade is attached to these step portions. Patent Document 2 discloses a method in which a plurality of step shapes are cut into a workpiece by these cutting blades at a time. Further, Patent Document 3 discloses a composite drill in which a center drill and an outer peripheral drill that surrounds the center drill in a concentric state are provided to be independently rotatable.

JP 2005-319558 A International Publication No. WO2010 / 023761A1 Pamphlet JP 2000-24814 A

  However, in the cutting tool described in Patent Document 1, although the cutting resistance can be reduced, the cutting resistance due to processing acts on the workpiece in one direction, so that there is a possibility that the workpiece is deformed in one direction.

  Moreover, in the cutting rotary tool of patent document 2, although each step part has a different outer diameter, since the rotational speed of each step part is the same, the cutting blade attached to the outer periphery of each step part is different. The workpiece is cut at the peripheral speed. For this reason, there exists a possibility that the malfunction which the surface state of the processed surface of a to-be-cut object and the abrasion state of the cutting blade in each step part of a cutting tool may become non-uniform | heterogenous may arise.

  An object of the present invention has been made in consideration of the above-described circumstances, and provides a cutting rotary tool that can uniformly process each stage of a multi-stage workpiece and can even a wear state of a cutting blade. There is.

  A cutting rotary tool according to the present invention includes a drive shaft to which rotation of a main shaft of a machine tool is transmitted, a drive shaft rotating body provided at an end portion of the drive shaft and having a cutting edge on an outer peripheral portion, and the drive shaft. A rotary shaft that is enclosed and arranged coaxially with the drive shaft, and is provided on the rotary shaft and has a cutting edge on an outer peripheral portion, and an outer diameter of the cutting blade is outside the cutting blade of the drive shaft rotary portion. The rotating shaft rotating body having a different diameter and the rotation of the drive shaft are transmitted to the rotating shaft while changing the number of rotations, whereby the cutting edge of the cutting blade of the driving shaft rotating body and the cutting of the rotating shaft rotating body are transmitted. A rotation transmission mechanism that sets the peripheral speeds of the blade and the blade tip to be the same.

  According to the present invention, since the peripheral speeds of the cutting edges of the cutting blades of the drive shaft rotating body and the rotating shaft rotating body arranged coaxially are set to be the same by the rotation transmission mechanism, Each stage can be uniformly processed by each cutting edge, and the wear state of the cutting edge can be made uniform.

Sectional drawing which shows 1st Embodiment of the cutting rotary tool which concerns on this invention. Sectional drawing which shows the deformation | transformation form in the cutting rotary tool of FIG. Sectional drawing which shows 2nd Embodiment of the cutting rotary tool which concerns on this invention. Sectional drawing which shows the deformation | transformation form in the cutting rotary tool of FIG. Sectional drawing which shows 4th Embodiment of the cutting rotary tool which concerns on this invention. Sectional drawing which shows 5th Embodiment of the cutting rotary tool which concerns on this invention. The fragmentary sectional view which shows the to-be-cut object cut by the cutting rotary tool of FIG. Sectional drawing which shows 6th Embodiment of the cutting rotary tool which concerns on this invention. Sectional drawing which shows 7th Embodiment of the cutting rotary tool which concerns on this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[A] First embodiment (FIGS. 1 and 2)
FIG. 1 is a cross-sectional view showing a first embodiment of a cutting rotary tool according to the present invention. A cutting rotary tool 10 shown in FIG. 1 cuts each stage of a multi-stage workpiece simultaneously, and includes a driving shaft 11, a rotating shaft 12, a driving shaft rotating body 13, a rotating shaft rotating body 14, and a rotation. The rotation transmission mechanism 15 is accommodated in the gear box 16.

  The drive shaft 11 is connected to a tooling 18 as a main shaft of the machine tool 17, and the rotation of the tooling 18 is transmitted. The rotating shaft 12 has a cylindrical shape (for example, a cylindrical shape), and includes the drive shaft 11 and is disposed coaxially with the drive shaft 11. The drive shaft 11 and the rotary shaft 12 pass through the gear box 16, and the drive shaft 11 is rotatably supported by the gear box 16 via the bearing 19 and the rotary shaft 12 via the bearing 20.

  The drive shaft rotator 13 is rotatably integrated with the end of the drive shaft 11 and includes a first cutting edge 21A on the outer periphery. A stopper 22 is installed at the end of the end of the drive shaft 11. The stopper 22 supports the drive shaft rotator 13 to prevent the drive shaft rotator 13 from falling off the drive shaft 11.

  The rotating shaft rotating body 14 is rotatably integrated with the outer periphery of the end of the rotating shaft 12, and includes a second cutting edge 21B on the outer peripheral portion. The second cutting edge 21B is disposed above the first cutting edge 21A of the drive shaft rotor 13, and the outer diameter of the second cutting edge 21B is different from the outer diameter of the first cutting edge 21A, and the first cutting edge 21A. Is set to be larger than the outer diameter. By these first cutting edge 21A and second cutting edge 21B, two step shapes are cut into the workpiece.

  A positioning stopper 23 is installed at the lower end of the rotating shaft 12 between the drive shaft rotating body 13 and the rotating shaft rotating body 14. The rotary shaft 12 is provided with a stopper 24 above the rotary shaft rotor 14 to prevent the rotary shaft rotor 14 from coming off upward.

  The rotation transmission mechanism 15 transmits the rotation of the drive shaft 11 to the rotation shaft 12 while changing the number of rotations in the same rotation direction. The rotation transmission mechanism 15 rotates with the first gear 25 installed integrally with the drive shaft 11. The second gear 26 is configured to rotate integrally with the shaft 12, and the first idle gear 27 and the second idle gear 28 are configured to rotate integrally with the idle shaft 29.

  The first gear 25, the second gear 26, the first idle gear 27, the second idle gear 28, and the idle shaft 29 are accommodated in the gear box 16. Among these, the idle shaft 29 is rotatably supported by the gear box 16 via the bearing 30. The gear box 16 is fixed to the machine tool 17 using a positioning block 31. The positioning block 31 prevents the gear box 16 from rotating (rotating) due to the rotation of the drive shaft 11, whereby the first gear 25, the second gear 26, the first idle gear 27, 2 The idle gear 28 rotates accurately.

  The first gear 25 and the first idle gear 27 mesh with each other, and the first idle gear 27 is formed with a smaller diameter and fewer teeth than the first gear 25. Therefore, the idle shaft 29 provided with the first idle gear 27 rotates in a direction opposite to the drive shaft 11 (reverse direction) and has a higher rotational speed than the rotational speed of the drive shaft 11. Further, the second gear 26 and the second idle gear 28 mesh with each other, and the second gear 26 has a larger diameter and a larger number of teeth than the second idle gear 28. Therefore, the rotating shaft 12 on which the second gear 26 is installed rotates in a direction (reverse direction) relative to the idle shaft 29, that is, rotates in the same direction with respect to the drive shaft 11 and rotates the idle shaft 29. The number of revolutions is lower than the number.

  Therefore, the outer diameters of the respective cutting edges of the first cutting edge 21A of the driving shaft rotating body 13 installed on the driving shaft 11 and the second cutting blade 21B of the rotating shaft rotating body 14 installed on the rotating shaft 12 are compared. Then, by adjusting the number of teeth of the first gear 25, the second gear 26, the first idle gear 27, and the second idle gear 28, the first cutting edge 21A of the drive shaft rotating body 13 and the rotating shaft rotating body 14 The first cutting blade 21A and the second cutting blade are rotated by rotating the second cutting blade 21B in the same direction and setting the rotational speed of the rotary shaft rotating body 14 to be lower than the rotational speed of the drive shaft rotating body 13. It becomes possible to set the peripheral speed of each blade edge to 21B the same.

  Three or more rotating bodies with cutting edges on the outer periphery are installed, all the rotating bodies rotate in the same direction, and three or more step shapes are formed on the workpiece by the cutting blades of each rotating body. May be.

  For example, as shown in FIG. 2, on the outer periphery of the rotary shaft 12, another rotary shaft 32 is disposed so as to contain the rotary shaft 12 and be coaxial with the drive shaft 11. The rotary shaft 32 is provided with another rotary shaft rotating body 33 at the lower end and a third gear 34 fixed at the upper end. The outer diameter of the outer peripheral portion of the rotating shaft rotating body 33 is formed to be, for example, larger than the outer diameter of the outer peripheral portion of the rotating shaft rotating body 14, and the third cutting edge 21 </ b> C is formed on the outer periphery of the rotating shaft rotating body 33. Is attached. The third gear 34 meshes with a third idle gear 35 that is rotatably integrated with the idle shaft 29, and has a larger diameter and a larger number of teeth than the third idle gear 35 and the second gear 26. The

  Therefore, the rotation shaft 32 on which the third gear 34 is installed rotates in the direction opposite to the idle shaft 29 (reverse direction), that is, the rotation in the same direction with respect to the drive shaft 11 and the rotation shaft 12. Further, the rotational speed is lower than that of the idle shaft 29 and the rotary shaft 12.

  As a result, the third cutting blade 21 </ b> C of the rotating shaft rotating body 33 installed on the rotating shaft 32 rotates in the same manner as the first cutting blade 21 </ b> A of the driving shaft rotating body 13 and the second cutting blade 21 </ b> B of the rotating shaft rotating body 14. Become a direction. Further, by comparing the outer diameters of the first cutting edge 21A, the second cutting edge 21B, and the third cutting edge 21C, the first gear 25, the second gear 26, the first idle gear 27, and the second idle edge are compared. By adjusting the number of teeth of the gear 28, the third gear 34, and the third idle gear 35, the rotational speed of the drive shaft rotating body 13 is set to the highest and the rotational speed of the rotating shaft rotating bodies 14, 33 is sequentially set to be lower. The peripheral speeds of the cutting edges of the first cutting edge 21A, the second cutting edge 21B, and the third cutting edge 21C can be set to be the same. Here, reference numeral 36 in FIG. 2 is a stopper that prevents the rotating shaft rotating body 33 from coming off upward.

From the above, according to the present embodiment, the following effect (1) is obtained.
(1) The circumference of the cutting edge in each cutting blade (the first cutting blade 21A, the second cutting blade 21B, and the third cutting blade 21C) of the drive shaft rotating body 13 and the rotating shaft rotating bodies 14, 33 arranged coaxially. Since the speeds are set to be the same by the rotation transmission mechanism 15, by appropriately setting the rotation speeds of the first cutting edge 21 </ b> A, the second cutting edge 21 </ b> B, and the third cutting edge 21 </ b> C, it is possible to cut the other stage shape Each stage of the object can be uniformly processed by the respective cutting blades 21A, 21B, and 21C, and the wear state of the first cutting blade 21A, the second cutting blade 21B, and the third cutting blade 21C can be made uniform.

[B] Second Embodiment (FIGS. 3 and 4)
FIG. 3 is a cross-sectional view showing a second embodiment of the cutting rotary tool according to the present invention. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is simplified or omitted.

  The cutting rotary tool 40 of the second embodiment is different from the first embodiment in that the rotation transmission mechanism 41 makes the rotation of the drive shaft 11 different from the rotation shaft 12 in the opposite direction (reverse direction). As a result, the cutting edge of the first cutting edge 21A of the drive shaft rotating body 13 and the cutting edge of the second cutting edge 21B of the rotating shaft rotating body 14 have the same peripheral speed in the opposite direction (reverse direction). Rotate with.

  In other words, the rotation transmission mechanism 41 is installed on the drive shaft 11 in a rotationally integrated manner, the second gear 42 in a rotationally integrated manner on the rotational shaft 12, and the idler shaft 29 is installed in a rotationally integrated manner. The first idle gear 27 and the second idle gear 44, and the first idle gear 46 for reverse rotation and the second idle gear 47 for reverse rotation that are rotatably integrated with the reverse rotation idle shaft 45 are accommodated in the gear box 16. Configured. A reverse idle shaft 45 is rotatably supported by a bearing 48.

  The first gear 25 and the first idle gear 27 mesh with each other, and the first idle gear 27 is formed with a smaller diameter and fewer teeth than the first gear 25. Therefore, the idle shaft 29 provided with the first idle gear 27 rotates in a direction opposite to the drive shaft 11 (reverse direction) and has a higher rotational speed than the rotational speed of the drive shaft 11. Further, the second idle gear 44 and the first idle gear 46 for reverse rotation mesh with each other, and the first idle gear 46 for reverse rotation has a larger diameter and a larger number of teeth than the second idle gear 44. Therefore, the reverse idle shaft 45 provided with the reverse reverse first idle gear 46 rotates in the direction opposite to the idle shaft 29 (reverse direction), that is, in the same direction with respect to the drive shaft 11 and idle. The rotational speed is lower than the rotational speed of the shaft 29.

  The second idle gear 47 for reverse rotation and the second gear 42 mesh with each other, and the second gear 42 has a larger diameter and a larger number of teeth than the second idle gear 47 for reverse rotation. Accordingly, the rotary shaft 12 on which the second gear 42 is installed rotates in a direction (reverse direction) relative to the reverse rotation idle shaft 45, that is, in a direction opposite to the drive shaft 11 (reverse direction). In addition, the rotational speed is lower than the rotational speed of the reverse idle shaft 45.

  Therefore, the outer diameters of the respective cutting edges of the first cutting edge 21A of the driving shaft rotating body 13 installed on the driving shaft 11 and the second cutting blade 21B of the rotating shaft rotating body 14 installed on the rotating shaft 12 are compared. The first gear 25, the first idle gear 27, the second idle gear 44, the reverse first idle gear 46, the reverse second idle gear 47, and the second gear 42 are adjusted to adjust the number of teeth. The first cutting blade 21A of the shaft rotating body 13 and the second cutting blade 21B of the rotating shaft rotating body 14 are rotated in the opposite direction (reverse direction), and the rotational speed of the rotating shaft rotating body 14 is further increased. It is possible to set the peripheral speeds of the respective cutting edges of the first cutting edge 21A and the second cutting edge 21B to be the same.

  Also in the second embodiment, a plurality of three or more rotating bodies having cutting edges on the outer periphery are installed, and the adjacently arranged rotating bodies rotate in a direction opposite to each other (reverse direction). A plurality of step shapes of 3 or more may be formed on the workpiece by the cutting blade.

  For example, as shown in FIG. 4, another rotary shaft 32 is disposed on the outer periphery of the rotary shaft 12 so as to include the rotary shaft 12 and be coaxial with the drive shaft 11. The rotary shaft 32 is provided with another rotary shaft rotating body 33 at the lower end and a third gear 49 fixed at the upper end. The outer diameter of the outer peripheral portion of the rotating shaft rotating body 33 is formed, for example, larger than the outer diameter of the outer peripheral portion of the rotating shaft rotating body 14, and the third cutting edge 21 </ b> C is formed on the outer periphery of the rotating shaft rotating body 33. It is attached. The third gear 49 meshes with a third idle gear 50 that is rotatably integrated with the idle shaft 29 and has a larger diameter and a larger number of teeth than the third idle gear 50.

  Accordingly, the rotation shaft 32 on which the third gear 49 is installed rotates in the direction (reverse direction) relative to the idle shaft 29, that is, the same direction with respect to the drive shaft 11 and the rotation shaft 12. The rotation is in the direction (reverse direction) and the rotational speed is lower than that of the idle shaft 29.

  As a result, the third cutting edge 21 </ b> C of the rotating shaft rotating body 33 installed on the rotating shaft 32 is in the same direction as the first cutting edge 21 </ b> A of the driving shaft rotating body 13, and the second cutting edge 21 </ b> B of the rotating shaft rotating body 14. Is the rotation in the opposite direction (reverse direction). Further, the outer diameters of the cutting edges of the first cutting edge 21A, the second cutting edge 21B, and the third cutting edge 21C are compared, and the first gear 25, the second gear 42, the third gear 49, and the first idle gear are compared. 27, by adjusting the number of teeth of the second idle gear 44, the third idle gear 50, the first idle gear 46 for reverse rotation, and the second idle gear 47 for reverse rotation, the rotational speed of the drive shaft rotor 13 is the highest and It is possible to set the rotational speeds of the rotary shaft rotors 14 and 33 to be sequentially lower and set the peripheral speeds of the first cutting edge 21A, the second cutting edge 21B, and the third cutting edge 21C to be the same. Become.

  Due to the above configuration, the second embodiment also provides the following effect (2) in addition to the same effect as the effect (1) of the first embodiment.

  (2) The rotation directions of the first cutting blade 21A, the second cutting blade 21B, and the third cutting blade 21C attached to the drive shaft rotating body 13, the rotating shaft rotating body 14, and the rotating shaft rotating body 33 arranged adjacent to each other are The directions are set in opposite directions (reverse directions), and the peripheral speeds of the cutting edges of the first cutting edge 21A, the second cutting edge 21B, and the third cutting edge 21C are set to be the same. For this reason, the force generated in the workpiece during cutting by the cutting rotary tool 40 is in the opposite direction for each of the first cutting edge 21A, the second cutting edge 21B, and the third cutting edge 21C, and is therefore canceled. Deformation caused by cutting in an object can be suppressed.

[C] Third embodiment (FIGS. 1 and 2)
In the third embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is simplified or omitted.

  The third embodiment is different from the first and second embodiments in that the drive shaft rotating body 13 is detachable (replaceable) on the drive shaft 11 and the rotating shaft rotating body 14 is mounted on the rotating shaft 12. Is a point.

  That is, the drive shaft 11 and the rotary shaft 12 are formed with male threads (not shown) as fastening members on the outer periphery. The drive shaft rotating body 13 is formed with a female screw (not shown) as a fastening member on the inner periphery in contact with the drive shaft 11, and the rotation shaft rotating body 14 is formed on the inner periphery in contact with the rotation shaft 12. Therefore, by driving the male screw of the drive shaft 11 and the female screw of the drive shaft rotator 13 together, and by engaging the male screw of the rotary shaft 12 and the female screw of the rotary shaft rotator 14, the drive shaft rotating body. 13. The rotating shaft rotating body 14 is configured to be attachable to or detachable from the driving shaft 11 and the rotating shaft 12 (detachable).

  Since it is configured as described above, the third embodiment also provides the following effects (3) in addition to the effects (1) and (2) of the first and second embodiments.

  (3) Since the drive shaft rotating body 13 is detachably attached to the drive shaft 11 and the rotating shaft rotating body 14 is attached to the rotating shaft 12 using a male screw and a female screw, respectively, there are various types according to the finished shape of the workpiece. The drive shaft rotating body 13 and the rotating shaft rotating body 14 can be changed to various shapes. Further, when the first cutting blade 21A and the second cutting blade 21B of the drive shaft rotating body 13 and the rotating shaft rotating body 14 are worn and need to be replaced, there is no need to remove the drive shaft 11 and the rotating shaft 12. Since it is sufficient to replace the drive shaft rotating body 13 and the rotating shaft rotating body 14, it is not necessary to replace the drive shaft 11 and the rotating shaft 12.

[D] Fourth embodiment (FIG. 5)
FIG. 5 is a sectional view showing a fourth embodiment of a cutting rotary tool according to the present invention. In the fourth embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description will be simplified or omitted.

  The cutting rotary tool 55 of the fourth embodiment is different from the first and second embodiments in that the first cutting blade 21A and the second cutting blade 21B are configured to be detachable (replaceable).

  That is, in the cutting rotary tool 55 of the fourth embodiment, the first cutting blade 21A is used for the drive shaft rotating body 13, the second cutting blade 21B is used for the rotating shaft rotating body 14, and the mounting screws 56 as connecting members are used. Can be attached detachably. To replace the first cutting blade 21A and the second cutting blade 21B, the mounting screw 56 is removed, the inappropriate first cutting blade 21A and the second cutting blade 21B are removed, and the appropriate first cutting blade using the mounting screw 56 is removed. 21A and the 2nd cutting blade 21B are attached.

  Since it is configured as described above, the fourth embodiment also provides the following effect (4) in addition to the same effects (1) and (2) as the first and second embodiments. .

  (4) Since the first cutting edge 21A is detachably attached to the drive shaft rotating body 13 and the second cutting edge 21B is attached to the rotating shaft rotating body 14 using the mounting screws 56, the first cutting edge 21A. When the second cutting blade 21B is worn and must be replaced, it is sufficient to replace only the first cutting blade 21A and the second cutting blade 21B with an appropriate one. Therefore, the drive shaft 11, the rotary shaft 12, There is no need to perform setup change to remove the drive shaft rotating body 13 and the rotating shaft rotating body 14.

[E] Fifth embodiment (FIGS. 6 and 7)
FIG. 6 is a cross-sectional view showing a fifth embodiment of the cutting rotary tool according to the present invention. FIG. 7 is a partial sectional view showing an object to be cut by the cutting rotary tool of FIG. In the fifth embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description is simplified or omitted.

  The cutting rotary tool 60 of the fifth embodiment is different from the first and second embodiments in that the respective cutting edge shapes of the first cutting edge 21A and the second cutting edge 21B are the target machining shape 62 of the workpiece 61. It is a point formed in conformity with.

  Therefore, according to the fourth embodiment, in addition to the effects (1) and (2) of the first and second embodiments, the following effect (5) is obtained.

  (5) Since the respective cutting edges of the first cutting edge 21A and the second cutting edge 21B are formed in conformity with the target machining shape 62 of the workpiece 61, the workpiece 61 can be targeted with a single cutting process. It can be formed in a step shape. For this reason, the cutting time can be shortened and the processing accuracy of the target processing shape 62 applied to the workpiece 61 can be improved.

[F] Sixth embodiment (FIG. 8)
FIG. 8 is a sectional view showing a sixth embodiment of the cutting rotary tool according to the present invention. In the sixth embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description will be simplified or omitted.

  The cutting rotary tool 70 of the sixth embodiment is different from the first and second embodiments in that the rotation transmission mechanism 71 includes a first planetary gear mechanism 72A and a second planetary gear mechanism 72B. is there.

  That is, the first planetary gear mechanism 72A includes a first sun gear 73 that is rotatably integrated with the drive shaft 11, a plurality of second planetary gears 74 that mesh with the first sun gear 73, and the first planetary gears. An internal gear 75 that meshes with the gear 74 and planetary carriers 76 and 77 that guide the first planetary gear 74 are configured. The internal gear 75 has a two-stage structure, and the first planetary gear 74 meshes with the upper stage. An annular guide groove 79 is formed on the lower surface of the planet carrier 76 and the upper surface of the planet carrier 77, and the shafts 80 of the plurality of first planetary gears 74 are fitted in the guide groove 79. The first planetary gear 74 revolves around the first sun gear 73 when its shaft 80 is guided by the guide groove 79 of the planetary carriers 76 and 77.

  The second planetary gear mechanism 72B includes a second sun gear 81 that is rotationally integrated with the rotating shaft 12, a plurality of second planetary gears 82 that mesh with the second sun gear 81, and the second planetary gears 82. Are configured to have an internal gear 75 meshing with each other and planetary carriers 77 and 78 for guiding the second planetary gear 82. The second planetary gear 82 meshes with the lower stage of the internal gear 75. An annular guide groove 83 is formed on the lower surface of the planet carrier 77 and the upper surface of the planet carrier 78, and the shafts 84 of the plurality of second planetary gears 82 are fitted in the guide groove 83. The second planetary gear 82 revolves around the second sun gear 81 as its shaft 84 is guided by the guide groove 83 of the planetary carriers 77 and 78. The planet carriers 76 and 78 are fixedly installed on the gear box 26.

  When the drive shaft 11 rotates due to the rotation of the tooling 18 of the machine tool 17, the first sun gear 73 of the first planetary gear mechanism 72A rotates, and the first planetary gear 74 revolves around the first sun gear 73 while rotating. Thus, the internal gear 75 is rotated, for example, in a direction (reverse direction) facing the drive shaft 11. Due to the rotation of the internal gear 75, the second planetary gear 82 of the second planetary gear mechanism 72B revolves around the second sun gear 81 while rotating, and the second sun gear 81 is moved relative to the internal gear 75, for example. In the same direction (reverse direction), that is, in the same direction with respect to the drive shaft 11. Due to the rotation of the second sun gear 81, the rotating shaft 12 rotates at the same rotational speed in the same direction as the second sun gear 81. The drive shaft rotator 13 provided with the first cutting blade 21A is rotated by the rotation of the drive shaft 11, and the rotation shaft rotator 14 provided with the second cutting blade 21B is rotated by the rotation of the rotation shaft 12.

  Here, by adjusting the number of teeth of the first sun gear 73, the first planetary gear 74, the internal gear 75, the second sun gear 81, and the second planetary gear 82, the first cutting blade 21A of the drive shaft rotor 13A. And the peripheral speeds of the respective cutting edges of the second rotary blade 21B of the rotary shaft rotor 14 can be set to be the same. Similarly, by adjusting the number of teeth of the first sun gear 73, the first planetary gear 74, the internal gear 75, the second sun gear 81, and the second planetary gear 82, the rotation direction of the rotary shaft 12 is also changed to the drive shaft 11. It is possible to set the direction opposite to (reverse direction).

  Since it was configured as described above, in the sixth embodiment, in addition to the same effects as the effects (1) and (2) of the first and second embodiments, the following effects (6) and ( Play 7).

  (6) Since the rotation transmission mechanism 71 includes the first planetary gear mechanism 72A and the second planetary gear mechanism 72B, the rotation transmission mechanism 15 of the first embodiment and the rotation transmission mechanism 41 of the second embodiment are included. In comparison, large shafts (the idle shaft 29 and the reverse idle shaft 45) can be omitted, and the rotation transmission mechanism 71 can be downsized.

  (7) As a feature of the planetary gear mechanism, a plurality of planetary gears (first planetary gear 74, second planetary gear 82) are evenly arranged around the sun gear (first sun gear 73, second sun gear 81). Therefore, the forces acting on these sun gears (first sun gear 73, second sun gear 81), planetary gears (first planetary gear 74, second planetary gear 82) and internal gear 75 are evenly distributed. For this reason, the load which acts on these gears (the 1st sun gear 73, the 2nd sun gear 81, the 1st planetary gear 74, the 2nd planetary gear 82, and the internal gear 75) can be reduced.

[G] Seventh embodiment (FIG. 9)
FIG. 9 is a sectional view showing a seventh embodiment of the cutting rotary tool according to the present invention. In the seventh embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is simplified or omitted.

  The difference between the cutting rotary tool 90 of the seventh embodiment and the first and second embodiments is that the gap A between the drive shaft 11 and the rotary shaft 12 is filled with cutting oil.

  That is, the tooling 18 and the drive shaft 11 of the machine tool 17 are formed in a hollow shape, and the cutting oil supplied to the vicinity of the first cutting edge 21A of the drive shaft rotating body 13 and the second cutting edge 21B of the rotating shaft rotating body 14 is supplied. In another route, the tooling 18 and the drive shaft 11 are filled and flowed. In the drive shaft 11, a plurality of discharge ports 91 are formed so as to pass through a portion included in the rotary shaft 12. The cutting oil filled and flowing in the drive shaft 11 is discharged from the discharge port 91, supplied to the gap A between the drive shaft 11 and the rotary shaft 12, filled in the gap A, and from the lower end of the rotary shaft 12. leak. Here, a seal member 92 is disposed on the inner periphery of the upper end portion of the rotary shaft 12, and the seal member 92 prevents the cutting oil in the gap A from leaking from the upper end portion of the rotary shaft 12.

  With the configuration as described above, the seventh embodiment also exhibits the same effect (8) as the effects (1) and (2) of the first and second embodiments. .

  (8) Since the cutting oil is filled and flows in the gap A between the drive shaft 11 and the rotary shaft 12, the wear of the sliding portion between the drive shaft 11 and the rotary shaft 12 can be reduced, and the drive shaft 11 and the temperature of the rotating shaft 12 can be lowered to suppress thermal expansion. By suppressing the thermal expansion of the drive shaft 11 and the rotary shaft 12, the processing accuracy of the workpiece by the cutting rotary tool 90 can be improved.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. Is included in the scope and gist of the invention, and is included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 Cutting rotary tool 11 Drive shaft 12, 32 Rotary shaft 13 Drive shaft rotary body 14, 33 Rotary shaft rotary body 15 Rotation transmission mechanism 17 Machine tool 18 Tooling (main shaft)
21A 1st cutting edge 21B 2nd cutting edge 21C 3rd cutting edge 40 Cutting rotation tool 41 Rotation transmission mechanism 55 Cutting rotation tool 56 Mounting screw (connection member)
60 cutting rotary tool 61 workpiece 62 target machining shape 70 cutting rotary tool 71 rotation transmission mechanism 72A first planetary gear mechanism 72B second planetary gear mechanism 90 cutting rotary tool 91 outlet A gap

Claims (8)

A drive shaft to which the rotation of the spindle of the machine tool is transmitted;
A drive shaft rotator installed at the end of the drive shaft and having a cutting edge on the outer periphery; and
A rotating shaft containing the drive shaft and disposed coaxially with the drive shaft;
A rotary shaft rotating body that is installed on the rotary shaft and has a cutting blade on the outer peripheral portion, and the outer diameter of the cutting blade is different from the outer diameter of the cutting blade of the drive shaft rotating portion,
By transmitting the rotation of the drive shaft to the rotation shaft while changing the number of rotations, the respective peripheral speeds of the cutting edge of the driving shaft rotating body and the cutting edge of the rotating shaft rotating body And a rotation transmission mechanism for setting the same to each other. The rotation transmission mechanism transmits the rotation of the drive shaft to the rotation shaft in the same direction or in the reverse direction, thereby rotating the cutting blade of the drive shaft rotation body and the cutting blade of the rotation shaft rotation body in the same direction or reverse direction. The cutting rotary tool according to claim 1, which is configured as described above. A plurality of the rotation shafts are installed coaxially with the drive shaft, and each of the rotation shafts is provided with a rotation shaft rotating body having a different outer diameter of the outer peripheral portion and provided with a cutting blade on the outer peripheral portion,
The rotation transmission mechanism transmits the rotation in the same direction or the reverse direction to the rotation shafts at different rotation speeds, so that the cutting edge of the cutting blade in each of the rotation shaft rotating bodies is transmitted in the same direction or the reverse direction. The cutting rotary tool according to claim 2, wherein the cutting rotary tool is configured to rotate at the same peripheral speed. The cutting rotation according to any one of claims 1 to 3, wherein the driving shaft rotating body is detachably installed on the driving shaft and the rotating shaft rotating body is mounted on the rotating shaft by a fastening member. tool. The cutting rotary tool according to any one of claims 1 to 3, wherein the cutting blade is detachably attached to each of the drive shaft rotating body and the rotating shaft rotating body by a connecting member. The cutting rotary tool according to any one of claims 1 to 5, wherein the cutting edge has a cutting edge shape formed into a target machining shape of the workpiece. The cutting rotation tool according to any one of claims 1 to 6, wherein the rotation transmission mechanism includes a planetary gear mechanism having a sun gear, a planetary gear, and an internal gear that mesh with each other. The drive shaft is filled with cutting oil, a discharge port is formed in the drive shaft, and the cutting oil discharged from the discharge port is filled in a gap between the drive shaft and the rotary shaft. The cutting rotary tool according to any one of claims 1 to 7, wherein the cutting rotary tool is provided.

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