JP3215056B2 - Rotary cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutter in which a disc-shaped throw-away tip (hereinafter, referred to as a tip) is detachably mounted on a tip mounting seat provided on a cutter body.

[0002]

2. Description of the Related Art Rotary cutters of this kind are:
The inventors of the present invention have proposed a rotary cutting tool as shown in FIG. 9 in Japanese Patent Application No. Hei 8-24436. In this rotary tool, a sheet member 2 having a cylindrical shaft portion 2A is provided at the tip of the tool body 1 so as to be rotatable around its central axis O, and at the tip (upper end) of the sheet member 2 , Bottom plate 3A and peripheral wall 3
B, a chip mounting member 4 having a chip mounting seat 3 formed thereon is detachably mounted with the chip mounting seat 3 facing upward, and a disk-shaped chip 5 is inserted into the chip mounting seat 3. The chip mounting member 4 is elastically deformed by the clamp screw 6 so that the peripheral wall 3B of the chip mounting seat 3 tightens the chip 5, and the center axis X of the chip 5 is set to the axis O of the sheet member 2. Are positioned to match

[0003] The cutting tool body 1 has a mounting hole 1A.
A cylindrical bearing member 6 is fixed to the mounting hole 1A, and the shaft member 2A is inserted into the seat mounting hole 6A on the inner periphery of the bearing member 6 in the seat member 2. It is rotatably mounted. At the lower end of the shaft portion 2A, a disc-shaped sheet restraining member 7 having a diameter larger than that of the seat mounting hole 6A is mounted by clamp screws 8, 8, and the shaft portion 2A in the seat mounting hole 6A is mounted. Is restricted from moving in the direction of the central axis O. However, according to the rotary cutting tool having such a configuration, the tip 5, the tip mounting member 4, and the sheet are cut by the circumferential cutting blade 5A formed on the tip 5 while rotating the work material. The cutting is performed by the cutting blade 5A while the member 2 and the seat restraining member 7 rotate integrally around their axes X and O.

[0004]

By the way, in the rotary tool having such a structure, the clamp screws 8, 8 are used.
When the bearing member 6 is tightly clamped by the sheet member 2 and the sheet restraining member 7 in the direction of the axis O when the nut is tightened, the distance from the chip 5 to the sheet restraining member 7 is increased as described above. It is difficult to rotate smoothly as one. For this reason, the upper end surface 6 of the bearing member 6
a and an upper lower end surface 2a of the sheet member 2 opposed thereto
And between the lower end surface 6b of the bearing member 6 and the upper end surface 7a of the seat restraint member 7 opposed thereto.
A predetermined clearance that allows rotation of the seat member 2 and the seat restraint member 7 is required. However, conversely, if the clearance is too large, fine chips generated at the time of cutting may be formed between the upper end 6a of the bearing member 6 and the upper lower end surface 2a of the seat member 2 or, in some cases, beneath the bearing member 6. End face 6b and upper end face 7a of seat restraint member 7
, And biting may occur, and smooth rotation of the chip 5 and the like may be hindered.

If the clearance is too large, the restraint of the movement of the sheet member 2 in the direction of the axis O by the sheet restraint member 7 becomes insufficient. , O direction, and a bearing is interposed between the seat mounting hole 6A and the shaft 2A of the seat member 2 in order to promote smooth rotation of the chip 5 and the like. If you have
The bearing may be knocked by the slight movement of the tip 5 or the like, and its life may be shortened.
For this reason, in the rotary tool having the above configuration, it is required that the clearance be accurately set to a predetermined value and that the clearance be strictly maintained, and a high level of skill is required for assembling the rotary tool. And it is inevitable that much effort is spent on management.

The present invention has been made in view of such circumstances, and in a rotary cutter such as the above-mentioned rotary tool, it is not necessary to precisely set and strictly maintain the clearance as described above. It is an object of the present invention to provide a rotary cutter capable of smoothly rotating members and the like.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above object, the present invention provides a disk-shaped throw-away tip which is detachably mounted on a tip mounting seat provided on a cutter body. In the rotary cutter attached, a sheet member provided with the tip mounting seat at a tip end portion of the cutter main body is attached to the indexable cutter.
Seat mounting holes that support the center of rotation
With the sheet member and the rear end up.
Protrude from the rear end of the seat mounting hole
Insert the rear end of the sheet member and the rear end of the mounting hole
Between the elastic members in the central axis direction.
Further, the sheet member is urged toward the rear end side in the center axis direction. Therefore, by the sheet member being urged toward the rear end side in the center axis direction in this manner,
The sheet member is always pressed against the cutter body with a pressing force that allows the rotation of the sheet member. Therefore, as described above, the sheet member does not need to be strictly set and managed as described above. It is possible to maintain the state of being in close contact with the side.

Here, in order to more reliably prevent chips and the like from entering and biting between the cutter body and the sheet member, the cutting body and at least the distal end of the sheet member in the center axis direction are required. It is desirable to interpose a seal member between them. Further, a thrust bearing is provided at a portion protruding from the seat mounting hole at the rear end of the seat member, and the elastic member is interposed between the thrust bearing and the rear end of the seat mounting hole, or A portion of the rear end protruding from the seat mounting hole is provided with a rear end side sealing member rotatable integrally with the sheet member and slidable in the center axis direction with respect to the sheet member, and the elastic member is provided. By interposing between the rear end side seal member and the rear end of the sheet member, it is possible to avoid a situation in which the elastic member comes into contact with members that rotate relatively and is worn. .

[0009]

1 to 4 show a first embodiment of the present invention.
1 shows an embodiment of the present invention. In the present embodiment, an attachment hole 13 having a blind hole shape is formed at the tip end portion 12 of the cutting tool body 11 at an angle from the upper surface to the lower surface, and the attachment hole 13 has a substantially cylindrical bearing member 14. Is inserted. The inner periphery of the bearing member 14 is
In the seat mounting hole 15, a substantially columnar sheet member 17 whose front end (upper end) portion 17 </ b> A is increased in diameter by one step through a radial bearing 16.
B is inserted. A tip mounting member 18 having a substantially bottomed annular shape is detachably mounted on the tip portion 17A of the sheet member 17 with its annular portion facing upward. A chip 20 having a substantially disk shape is detachably mounted by a clamp screw 21 that is screwed into the sheet member 17 through the chip 20 and the chip mounting member 18.

Here, the tip (upper end) of the bearing member 14
The portion 14A is formed in the shape of a flange that is one step larger in diameter than the cylindrical body portion 14B fitted in the mounting hole 13, and the upper surface of the tip portion 14A of the bearing member 14 and the tip portion of the seat member 17 A thrust bearing 22 is interposed between the lower surface 17A and the thrust bearing 22 and the radial bearing 16.
The seat mounting hole 15 is rotatable about its central axis O.
It is supported by. Further, the body 14 of the bearing member 14
A concave portion 14C is formed in B and the cutting tool body 1
A through-hole 12A is formed in the distal end portion 12 so as to communicate with the mounting hole 13 and open at the position of the concave portion 14C. A fixing piece 23 is inserted into the through-hole 12A and a clamp screw 24 is used. The bearing member 14 is fixed in the mounting hole 13 by engaging the tip of the fixed piece 23 with the concave portion 14C. An O-ring 25 is attached to the outer periphery of the fixed piece 23 so as to seal the through hole 12A.

Further, a through hole 14D communicating with the seat mounting hole 15 on the inner peripheral side is formed in the body 14B of the bearing member 14.
On the other hand, at the tip 12 of the cutting tool body 11,
An oil passage 12B is formed at the inner peripheral surface of the mounting hole 13 so as to open at one end at a position facing the through hole 14D. The other end of the oil passage 12B is It communicates with a mounting hole 12C drilled from the upper surface. A grease nipple 26 is attached to the attachment hole 12C.
Through the oil passage 12B and the through-hole 14D from the seat mounting hole 15 of the bearing member 14 and the shaft 1 of the seat member 17.
7B can be supplied with lubricating oil.

On the other hand, a rear end portion 17C of the shaft portion 17B of the seat member 17 is projected from a rear end of the seat mounting hole 15 of the bearing member 14, and a disk-shaped receiving plate is formed on the rear end portion 17C. 27 is attached by clamp screws 28, 28, and further on the tip side of the receiving plate 27,
The thrust ball bearing 29 is the shaft portion 17B of the seat member 17.
At the rear end 17C. A ring-shaped disc spring receiving member 30 is fitted to the rear end of the bearing member 14 so as to fit into the opening of the seat mounting hole 15. A disc spring 31 as an elastic member in the present embodiment is interposed between the disc spring receiving member 30 and the thrust ball bearing 29 in a compressed state, and the disc spring 31 tends to expand. The sheet member 17 is urged toward the rear end side in the direction of the axis O together with the thrust ball bearing 29 and the receiving plate 27 by being pressed by the resulting elastic force.

On the other hand, on the distal end side of the sheet member 17, between the distal end portion 17A of the sheet member 17 and the periphery of the opening of the mounting hole 13 on the upper surface of the distal end portion 12 of the cutting tool body 11, the bearing member 14 is provided. An annular tip-side seal member 32 is interposed so as to be fitted on the outer periphery of the tip portion 14A.
7 is urged toward the rear end side in the direction of the axis O, the rear end surface of the front end portion 17A of the sheet member 17 comes into contact with the front end surface of the front end seal member 32, and the front end seal member 3
2 is pressed against the rear end side in the direction of the axis O to be brought into close contact with the cutting tool main body 11. Further, an O-ring is provided between the outer peripheral surface of the distal end portion 14A of the bearing member 14 and the upper surface of the distal end portion 12 of the cutting tool body 11 in an annular groove 32A formed on the rear end side of the inner diameter portion of the distal end side seal member 32. 33 are interposed. A hexagon socket head bolt 34 is screwed on the upper surface of the distal end portion 12 of the cutting tool body 11 at a position close to the outer periphery of the distal end side sealing member 32. By engaging with a concave portion 32B formed on the outer peripheral portion of the member 32, the rotation of the distal end side seal member 32 is restricted.

In this embodiment, similarly to the rotary tool described in Japanese Patent Application No. 8-24436,
The chip 2 is mounted on the chip mounting seat 19 of the chip mounting member 18.
By attaching 0, the chip attaching member 18 is elastically deformed so that the central axis X of the chip 5 coincides with the axis O of the sheet member 17. That is, in the present embodiment, the front end surface 17D of the sheet member 17 is formed as a surface orthogonal to the axis O, and
A fitting hole 17E centering on the axis O is formed in the center of D, while the tip mounting member 18 is formed of a material that is relatively elastically deformable, such as spring steel, for example.
A conical bottom plate portion 18A which is inclined toward the rear end side at an extremely small angle around the axis O toward the outer peripheral side, and the inner diameter of which is also slightly smaller than the outer diameter of the chip 20 around the axis O as well. An annular fitting portion 18C that can be fitted into the fitting hole 17E is provided on the lower surface of the bottom plate portion 18A so as to protrude from the bottom surface of the bottom plate portion 18A.

Therefore, when the chip 20 is not clamped only when the chip 20 is placed on the chip mounting seat 19, the chip mounting member 18 is located between the lower surface of the bottom plate 18A and the front end surface 17D of the sheet member 17, and Between the upper surface of the bottom plate portion 18A (the bottom surface of the chip mounting seat 19) and the seating surface of the chip 20, there is formed a very small gap that gradually decreases toward the outer peripheral side and the inner peripheral side, respectively. An extremely small gap is also formed between the bottom plate portion 1B and the outer peripheral surface of the chip 20. By screwing the clamp screw 21 from this unclamped state, the bottom plate portion 1
The chip mounting member 18 is elastically deformed so as to fill the gaps on the upper and lower surfaces of the chip 8A, whereby the peripheral wall portion 18B is uniformly reduced in diameter, and the outer peripheral surface of the chip 20 is clamped. The chip 20 is positioned so as to coincide with the central axis 18 of the sheet member 17, that is, the central axis O of the sheet member 17. The tip mounting member 1 is attached to the bottom plate 18A of the chip mounting member 18.
8 is inserted through the countersunk screw 35 to prevent the sheet member 1 from falling off.
7 screwed.

Further, in the present embodiment, the disk-shaped chip 20 mounted on the chip mounting seat 19 is formed of a hard material such as a cemented carbide, and one of the circular upper and lower surfaces is a rake face. And the other is the tip mounting seat 1
9 is used as a seating surface on the front and back surfaces of the rake surface, and the outer peripheral surface is a flank surface, and a circular cutting edge 20A is formed at the intersection ridge line between the rake surface and the flank surface. Is formed. A groove-shaped chip breaker 20B is formed on the outer peripheral edge of the upper and lower surfaces of the chip 20 so as to orbit along the cutting edge 20A. The upper and lower edges of the outer peripheral surface, which are flank surfaces, are also provided with inclined surfaces that incline toward the inner peripheral side as they go in the up and down direction.
It may be formed so as to go around along. In this case, the cutting edge 20A is strictly a part of these chip breakers 20B.
And an inclined surface.

However, according to the rotary bite constructed as described above, the disc spring 31 attaches the seat member 17 to the rear end side in the axis O direction via the thrust ball bearing 29 and the receiving plate 27 as an elastic member. By urging the front end portion 17A of the seat member 17, the bearing member 1
4 is pressed against the thrust bearing 22 and the tip-side seal member 32 of the tip portion 14A so as to be in close contact with each other. Therefore, the clearance between the sheet member 17 and the tip-side seal member 32 or the bearing member 14 becomes too large. hand,
Fine chips generated at the time of cutting enter and cause biting, the tip 20 slightly moves in the directions of the axes O and X during the cutting, or the fine movement causes damage to the radial bearing 16 and the thrust bearing 22. Can be prevented beforehand. Moreover, since the sheet member 17 is always urged by the disc spring 31, the clearance does not change during use or storage of the rotary tool. For this reason, it is possible to relatively easily perform the assembly of the rotary bite without much skill, and to simplify the management.

Further, in the present embodiment, between the seat mounting hole 15 of the bearing member 14 and the shaft portion 17B of the seat member 17,
A radial bearing 16 and a thrust bearing 22 are interposed between a front end portion 14A of the bearing member 14 and a front end portion 17A of the seat member 17, respectively, and a bearing in which the radial bearing 16 and the thrust bearing 22 are interposed. A distal end side sealing member 32 provided with an O-ring 33 is provided so as to cover an opening portion between the member 14 and the seat member 17, and is formed between the seat member 17 and the cutting tool body 11 to which the bearing member 14 is fixed in the axis O direction. It is interposed in between. Therefore, according to the present embodiment, the radial bearing 16 and the thrust bearing 22 promote the smooth rotation of the seat member 17, that is, the smooth rotation of the chip 20, but the radial bearing 16 and the thrust bearing 22 It is possible to more reliably prevent intrusion of chips and the like into the interposed portion, and to provide a rotary cutting tool that exhibits stable cutting performance over a long period of time in combination with the urging of the sheet member 17. It becomes possible.

Further, in the present embodiment, a disc spring 31 as an elastic member for urging the sheet member 17 is provided at the rear end 1 of the sheet member 17 projecting from the rear end of the sheet mounting hole 15.
7C, the chip 20 has a rake face as compared with, for example, a case where the tip 20 is urged through a clamp piece or the like from the front end side of the sheet member, that is, from above the chip.
A member that can be an obstacle, such as the clamp piece, is not disposed on the upper surface of the device, so that tangling of chips and the like can be prevented and reliable processing can be achieved.
It is also possible to prevent the smooth rotation of the chip from being hindered by frictional resistance when the clamp piece presses the chip. Moreover, in the present embodiment, this disc spring 31
Is disposed between the tip of the thrust ball bearing 29 attached to the seat member 17 and the disc spring receiving member 30 attached to the rear end of the bearing member 14. Can maintain a state in which the disc spring 31 does not rotate with respect to the rear end portion that rotates with the sheet member 17, so that the disc spring 31 directly contacts both the portion that rotates with the sheet member 17 and the portion that is fixed to the cutting tool body 11. And therefore the sheet member 17
It is also possible to prevent a situation in which the life of the disc spring 31 is shortened due to wear due to the rotation of the spring.

In this embodiment, as described above, the O-ring 33 is mounted in the annular groove 32A formed in the front-end-side seal member 32, and the sheet member 17 is urged rearward by the disc spring 31. When the O-ring 33 is in contact with the distal-side seal member 32, the sealing force between the sheet member 17 and the distal-side seal member 32 is maintained by the elastic force of the O-ring 33, and the sheet member 17 is rotated by the thrust bearing 22. As shown in FIG. 5, for example, as shown in FIG. 5, a blind hole is formed in a portion of the tip end portion 12 of the cutting tool main body 11 where the tip side sealing member 32 is attached along the axis O direction. 12D may be formed, and the coil spring 36 may be loosely inserted so that the distal end projects into the blind hole 12D. However, even in the rotary cutting tool thus configured, the coil spring 36
Of the front end side sealing member 32 and the sheet member 1 by the elastic force of
7, the front end portion 17A of the seat member 17 is rotatably supported by being seated on the thrust bearing 22, so that the same effect as the above configuration can be obtained.

FIGS. 6 and 7 show a second embodiment of the present invention. As in the case of the modification shown in FIG. 5, the first embodiment shown in FIGS. The same parts as those of the embodiment are denoted by the same reference numerals, and the description is omitted. In the second embodiment, the rear end portion 17C of the shaft portion 17B of the sheet member 17 protruding from the rear end of the seat mounting hole 15 is sequentially arranged rearward toward the rear end side in the central axis O direction. A seal member 41 and a disc spring receiving member 42 are attached, and the rear end side seal member 41 and the disc spring receiving member 4 are attached.
A disc spring 43 as an elastic member is interposed between the second spring 2 and the second spring. In the illustrated second embodiment, the mounting hole 13 is a through hole, but may be a blind hole as in the first embodiment.

Here, the rear end side sealing member 41 is formed in a substantially cylindrical outer shape, the outer diameter of which is larger than the inner diameter of the seat mounting hole 15, and the inner diameter is The size is set to be slidable on the rear end 17C of the shaft 17B. In addition, a pair of concave portions 41 that are opened at the distal end surface of the rear end side sealing member 41 and extend in the
A and 41A are formed on opposite sides of the axis O, while the shaft 17B of the seat member 17 is provided with the axis O at a position protruding from the rear end of the seat mounting hole 15 of the bearing member 14. A pin 44 is fitted in the diametrical direction with respect to the shaft member 17. Both ends of the pin 44 project from the outer periphery of the shaft 17 </ b> B and are engaged with the recesses 41 </ b> A, 41 </ b> A. 17 and is freely movable in the direction of the axis O, and is rotatable integrally around the axis O. Further, the rear end side sealing member 41
An O-ring 45 is attached to an annular groove 41B formed on the rear end side of the inner diameter portion.

The disc spring receiving member 42 is a substantially disk-shaped member having an outer diameter substantially the same as that of the rear end side sealing member 41, and is fitted to the rear end of the shaft portion 17B of the sheet member 17. It is inserted and is fixed by clamp screws 28, 28, similarly to the receiving plate 27 of the first embodiment. Then, the disc spring 43 is interposed between the disc spring receiving member 42 and the rear end side sealing member 41 in a state where the disc spring 43 is compressed in the direction of the axis O, so that the disc spring 43 tends to expand. The rear end side sealing member 41 is pressed to the front end side in the direction of the axis O by elastic force, and abuts against the rear end surface of the bearing member 14. Will be energized. Therefore, also in the second embodiment, similarly to the first embodiment, the sheet member 17 is provided.
And the tip-side seal member 32 on the side of the cutting tool body 11 can be kept in close contact with each other to prevent intrusion of chips and the like, and the clearance between the sheet member 17 and the tip-side seal member 32 can be set and managed. Can be greatly reduced.

Further, in the second embodiment,
Also on the rear end 17C side of the sheet member 17, an O-ring is provided between the disc spring receiving member 42 attached to the rear end of the shaft 17B of the sheet member 17 and the bearing member 14 provided on the cutting tool body 11. A rear end side sealing member 41 provided with a sealing member 45 is interposed between the rear end side sealing member 41 and the sheet member 17 by the O-ring 45. Since the rear end side seal member 41 is in close contact with the rear end surface of the bearing member 14, as a result, the sealing performance on the rear end side of the seat mounting hole 15 can be reliably ensured. Therefore, for example, it is possible to prevent a situation in which the lubricating oil supplied from the grease nipple 26 to the sheet mounting hole 15 leaks out from the rear end side of the sheet mounting hole 15, and it is possible to prevent the lubricating oil from occurring for a longer period of time. The smooth rotation of the sheet member 17 can be maintained over the entire area, and the mounting hole 13 can be formed as a through hole as described above.

Moreover, in the second embodiment,
In accordance with the rotation of the disc spring receiving member 42 attached to the sheet member 17, the rear end side sealing member 41 also
The recesses 41 </ b> A, 4 are inserted into the pins 44 fitted in the sheet member 17.
1A is engaged so as to be integrally rotatable, and the disc spring 43 is interposed between the disc spring receiving member 42 that rotates integrally with the sheet member 17 and the rear end side seal member 41. As in the first embodiment, this disc spring 43
Does not wear due to the rotation of the sheet member 17. On the other hand, since the rear end side seal member 41 is relatively movable with respect to the sheet member 17 in the direction of the axis O, the sealing performance of the rear end side seal member 41 is not impaired. In this embodiment, similarly to the first embodiment shown in FIGS. 1 to 4, an O-ring 33 is attached to the front-end-side seal member 32 to maintain the sealing property between the front end portion 17A of the sheet member 17. However, as in the modification shown in FIG. 5, this is changed by the coil spring 36 as shown in FIG.
2 may be urged toward the front end side in the axis O direction.

In each of the above embodiments, the sheet member 1
Although the disc springs 31 and 43 are used as the elastic members for urging the coil 7, a coil spring or the like may be used instead. However, when the coil spring is used as the elastic member as described above, the elastic member is unavoidably elongated in the direction of the axis O depending on the elastic coefficient. Alternatively, it is desirable to use a wave washer. Further, when the mounting hole 13 is formed as a through hole as in the second embodiment shown in FIGS. 6 and 7 and the modified example shown in FIG. 8, a cap or the like is provided at the rear end side opening. Is attached to close the opening, it is possible to prevent chips and the like from entering from the opening. Furthermore, in the above embodiment, the case where the present invention is applied to a rotary tool has been described. However, the present invention may be applied to other types of cutters as long as the tool performs cutting by rotating a disk-shaped tip. Of course, it is also possible.

[0027]

As described above, according to the present invention,
By urging the sheet member on which the chip is mounted to the rear end side, the sheet member is pressed toward the cutter body with a pressing force that allows the rotation of the sheet member, thereby preventing intrusion of chips and the like. it can. This makes it possible to accurately set the clearance between the sheet member and the cutter body and to promote smooth rotation of the sheet member and the chip without strictly controlling the clearance. It is possible to achieve stable cutting while reducing the labor required for assembling and managing the components.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a plan view of the embodiment shown in FIG.

FIG. 3 is a front view of the embodiment shown in FIG. 1;

FIG. 4 is a sectional view taken along line YY in FIG. 2;

FIG. 5 is a sectional view showing a modification of the first embodiment.

FIG. 6 is a sectional view showing a second embodiment of the present invention.

FIG. 7 is a sectional view taken along the line ZZ in FIG. 6;

FIG. 8 is a cross-sectional view illustrating a modification of the second embodiment.

FIG. 9 is a sectional view of the tip of a rotary tool filed by the inventors of the present invention.

[Explanation of symbols]

 11 Tool body (cutter body) 14 Bearing member 15 Seat mounting hole 16 Radial bearing 17 Seat member 19 Tip mounting seat 20 Throw-away chip 22 Thrust bearing 25, 33, 45 O-ring 27 Receiving plate 29 Thrust ball bearing 30, 42 Disc spring Receiving members 31, 43 Belleville spring (elastic member) 32 Front-end side sealing member 41 Rear-end side sealing member O Central axis of sheet member 17 X Central axis of indexable tip 20

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroaki Hayashizaki 1511 Furamagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Inside the Tsukuba Works, Mitsubishi Materials Corporation (72) Inventor Kiyoshi Hasegawa 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Nissan (56) References JP-A-56-163817 (JP, A) JP-A-2-51005 (JP, U) US Patent 4,456,407 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23B 27/12 B23B 27/16 B23B 27/00 B23B 27/08 B23B 27/14

Claims (4)

(57) [Claims] 1. A rotary cutter in which a disc-shaped throw-away tip is detachably mounted on a tip mounting seat provided on a cutter main body, wherein the tip mounting seat is provided at a tip end of the cutter main body. Around the center axis of the indexable insert
A rotatable seat mounting hole is provided
The rear end of the sheet member has the sheet mounting hole.
Protruding from the rear end of the
Between the rear end of the seat member and the rear end of the mounting hole.
The elastic member is interposed in the center axis direction.
Wherein the sheet member is biased toward the rear end side in the center axis direction. 2. The rotary cutter according to claim 1, wherein a seal member is interposed between the cutter body and at least a front end portion of the sheet member in the central axis direction. 3. A thrust bearing is provided at a portion of the rear end of the seat member protruding from the seat mounting hole, and the elastic member is provided between the thrust bearing and a rear end of the seat mounting hole. Claims that are interposed
The rotary cutter according to claim 1 or 2 . 4. A portion protruding from the seat mounting hole at a rear end of the sheet member is rotatable integrally with the sheet member and slidable in the central axis direction with respect to the sheet member. rear-side seal member is provided, according to claim 1, wherein the elastic member is characterized in that it is interposed between the rear end of the rear-side seal member and the seat member
Or the rotary cutter according to claim 2 .