JP2000334601A - Torsional vibration cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a stable cutting state by screwing a cap screw on one of opposed groove side parts of a tip mounting groove, providing a tip seating surface on the other of the opposed groove side parts of the tip mounting groove and pressing and holding a cutting tip seated on the tip seating surface on the tip seating surface by the cap screw. SOLUTION: A vibrating body 14 constitutes a cutter mounting part 64 by a tip mounting groove 65 recessed on a tip outer peripheral part of a horn 23 and a screw inserting and fixing part 66 notched and formed on the tip outer peripheral part. A cap screw 63 is screwed in a female screw part 66A of the screw inserting and fixing part 66 formed on one of opposed groove side parts of the tip mounting groove 65, a tip seating surface 67 is provided on the other, and cutting tip 61 seated on the tip seating surface 67 and a pressing metal 62 are pressed and held on the tip seating surface 67 by the cap screw 63. As a result, unbalance of moment of inertia around a center axis of the vibrating body 14 can be reduced. Vibration energy generated by a torsional vibrating body is stably supplied to cutting tip 61 and a stable cutting state can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a torsional vibration cutting device.

[0002]

2. Description of the Related Art It is conceivable to construct a vibration cutting apparatus by providing a cutting tip on a vibrating body driven by a torsional vibrator. At this time, as shown in FIG. 9, the torsional vibration cutting device cuts the blade mounting portion 2 on the outer peripheral portion of the vibrating body 1 where the amplitude of the torsional vibration is maximum, and the cutting tip is seated on the blade mounting portion 2. It is conceivable to mount 3 with mounting screws 4.

[0003]

However, the prior art has the following problems. The cutting tip 3 is held by the vibrating body 1 only on one side in the circumferential direction of the vibrating body 1, and the torsional vibration of the vibrating body 1 is applied only from one side thereof. Therefore, it is difficult to stably supply the torsional vibration energy generated by the vibrating body 1 to the cutting tip 3 to secure a stable cutting state.

[0004] The blade mounting portion 2 is provided only at one location in the circumferential direction of the vibrating body 1, and the unbalance of the moment of inertia about the central axis of the vibrating body 1 increases.
It hinders the stability of torsional vibration and induces abnormal vibration. Therefore, it is difficult to stably supply the torsional vibration energy generated by the vibrating body 1 to the cutting tip 3 to secure a stable cutting state.

It is an object of the present invention to stably supply vibration energy generated by a torsional vibrator to a cutting tip and to secure a stable cutting state.

[0006]

According to a first aspect of the present invention, there is provided a torsional vibration cutting apparatus comprising a cutting tip mounted on a blade mounting portion provided on an outer peripheral portion of a vibrator driven by a torsional vibrator. The blade mounting portion is provided with a chip mounting groove recessed in an outer peripheral portion of the vibrating body, and a holding screw is screwed into one of the opposite groove side portions of the chip mounting groove, and the chip mounting groove is opposed to the chip mounting groove. A chip seating surface is provided on the other of the side portions so that a cutting tip seated on the chip seating surface can be pressed and held on the chip seating surface with a holding screw.

According to a second aspect of the present invention, there is provided a torsional vibration cutting apparatus comprising a cutting tip mounted on a blade mounting portion provided on an outer peripheral portion of a vibrating body driven by a torsional vibrator. , A plurality of blade attachment portions are equally arranged at a plurality of positions in the circumferential direction.

According to a third aspect of the present invention, there is provided a torsional vibration cutting apparatus comprising a cutting tip mounted on a blade mounting portion provided on an outer peripheral portion of a vibrating body driven by a torsional vibrator, wherein the blade mounting portion vibrates. A wedge-shaped chip mounting groove having a narrow width toward the outside in the radial direction of the vibrating body is provided on an outer peripheral portion of the vibrating body, and a holding screw is screwed on a back side of the chip mounting groove of the vibrating body. The wedge-shaped cutting tip mounted in the chip mounting groove is pressed by a holding screw to be wedge-bonded to the chip mounting groove.

[0009]

According to the first aspect of the present invention, the following operations are provided. When mounting the cutting tip on the outer peripheral portion of the vibrating body where the amplitude of the torsional vibration is maximized, the cutting tip is placed inside the chip mounting groove, with the chip seating surface on one side of the chip mounting groove and the holding screw on the other side. Accordingly, the vibrating body is sandwiched from both sides in the circumferential direction. Thereby, the exciting force of the torsional vibration generated by the vibrating body is applied from both sides, and the torsional vibration energy generated by the vibrating body is stably supplied to the cutting tip, so that a stable cutting state can be secured.

According to the second aspect of the present invention, the following operations are provided. Since the blade mounting portions are equally arranged at a plurality of positions in the circumferential direction of the vibrating body, it is possible to reduce the unbalance of the moment of inertia around the central axis of the vibrating body. As a result, the blade mounting portion can be formed without hindering the stability of the torsional vibration of the vibrating body and without inducing abnormal vibration, and the torsional vibration energy generated by the vibrating body is stably supplied to the cutting tip to be stable. Cutting condition can be secured.

[0011] A plurality of types of cutting tips can be simultaneously attached to one vibrating body, and there is no need to replace the vibrating body each time a plurality of types of cutting tips are used, so that cutting workability can be improved.

According to the third aspect of the present invention, the following effects are obtained. The cutting tip is wedge-coupled to a wedge-shaped tip mounting groove provided on the vibrating body, and the cutting tip is sandwiched from both sides in the circumferential direction of the vibrating body. Thereby, the exciting force of the torsional vibration generated by the vibrating body is applied from both sides, and the torsional vibration energy generated by the vibrating body is stably supplied to the cutting tip, so that a stable cutting state can be secured.

The cutting tip is wedge-coupled to the tip mounting groove of the vibrating body. By arranging only the cutting edge at the tip of the cutting tip so as to protrude out of the chip mounting groove, the entire cutting tip is connected to the vibrating body. A strong fastening state without relative displacement is provided. In addition, since the cutting tip is a wedge itself and has a function as a fastening part, the number of fastening parts for the cutting tip is reduced, a heating surface between the cutting tip and the vibrating body is reduced, and the fastening part is reduced. , The torsional vibration transmission efficiency caused by the presence of the mass can be reduced. Thus, the cutting tip can more reliably induce the same vibration as the vibration originally given by the vibrating body, and can stably supply the torsional vibration energy generated by the vibrating body to the cutting tip to secure a stable cutting state.

The cutting tip is wedge-coupled to the tip mounting groove of the vibrating body. Only the cutting edge at the tip of the cutting tip is arranged to protrude out of the chip mounting groove. The torsional vibration of the vibrating body is small, and the effect on the vibration is minimized. By installing the vibrating body on the center axis side, torsional vibration with stable and high output power can be maintained efficiently with little energy. .

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing an ultrasonic vibration cutting device, FIG. 2 is a schematic diagram showing an ultrasonic vibrator, FIG. 3 is a schematic diagram showing a torsional vibrator, and FIG. FIG. 5 is a schematic view showing a state in which the blade of the first embodiment is mounted on the blade mounting portion, FIG. 6 is a schematic view showing a blade mounting portion of the vibration body, and FIG. 7 is a vibration diagram of the second embodiment. FIG. 8 is a schematic diagram illustrating a blade attachment state to a blade attachment portion of a body, FIG. 8 is a schematic diagram illustrating a blade attachment state to a blade attachment portion of a vibrating body according to a third embodiment, and FIG. 9 is a schematic diagram illustrating a conventional technique. .

(Ultrasonic Vibration Cutting Apparatus 10) (FIG. 1) The ultrasonic vibration cutting apparatus 10 is a milling machine-like type as shown in FIG. 1 (A), supporting a table 12 on a column 11 and a tool post. 13 and the tool rest 13
An ultrasonic vibrator 14 (driven by a torsion vibrator 21 described later) in a torsional vibration mode is held, and a blade 15 can be attached to and detached from the tip of the ultrasonic vibrator 14. 1
Reference numeral 01 denotes a workpiece made of metal, resin, rubber, or the like.

In the ultrasonic vibration cutting apparatus 10, the cutting motion applying means for moving the blade 15 to cut the workpiece 101 is constituted only by the vibration of the ultrasonic vibration body 14. Therefore, in the ultrasonic vibration cutting device 10, the main shaft for rotating the blade 15 at a high speed (cutting speed v) for the cutting motion, which is indispensable in the conventional milling machine, is not required as the cutting motion applying means. .

In the ultrasonic vibration cutting apparatus 10, the feed motion means for moving the blade 15 to a new cutting area of the workpiece 101 is provided by an X-axis drive motor 16 of the table 12 and a Z-axis drive motor 17 of the table 12. , The Y-axis drive motor 18 for the tool rest 13 and the θ-axis (rotation angle) drive motor 19 for the tool 15
It consists of. Reference numeral 20 denotes an NC control panel.

Therefore, in the cutting process by the ultrasonic vibration cutting device 10, the ultrasonic vibration body 14 is vibrated by driving the torsional vibrator 21, which will be described later, so that the blade 15 comes into contact with the workpiece 101 to perform a cutting motion. Workpiece 10
It is sufficient that the cutting tool 1 is simply moved in consideration of only the relative positional relationship with the workpiece 101 in order to give the workpiece 101 a fixed machining shape by the feeding motion means of the motors 16 to 19 while cutting the workpiece 1. Becomes

Since the ultrasonic vibration cutting device 10 does not require a main shaft which is indispensable in a conventional milling machine, the ultrasonic vibration body 14 is provided at the tip of the cantilever arm of the SCARA type robot.
Can also be simplified by providing

As shown in FIG. 1B, the ultrasonic vibration cutting device 10 may be of a lathe-like type. In this case, a headstock 11A and a tailstock are mounted on a bed (not shown). 1
2A and a pallet-type tool post 13;
An ultrasonic vibrator 14 (driven by a torsion vibrator 21 described later) in a torsional vibration mode is held at a predetermined position of the tool rest 13, and a blade 15 can be attached to and detached from the tip of the vibrator 14. .

In the ultrasonic vibration cutting device 10, the cutting motion applying means for moving the blade 15 to cut the workpiece 101 is constituted only by the vibration of the ultrasonic vibration body 14. Therefore, the ultrasonic vibration cutting device 10 does not need to rotate the workpiece 101 at a high speed by the main shaft 11B for the cutting motion, which is indispensable for the conventional lathe.

Further, in the ultrasonic vibration cutting device 10, a feed motion means for moving the blade 15 to a new cutting area of the workpiece 101 is provided by a rotary feed drive unit (not shown) of the main shaft 11B,
The tool rest 13 includes an X-axis feed drive (not shown) and a tool rest 13 with a Z-axis feed drive (not shown).

Therefore, in the cutting process by the ultrasonic vibration cutting device 10, the ultrasonic vibration body 14 is vibrated to bring the blade 15 into contact with the workpiece 101, thereby performing a cutting motion to cut the workpiece 101, It suffices that the feed drive unit simply performs a feed motion in consideration of only the relative positional relationship with the workpiece 101 for transmitting a fixed processing shape to the workpiece 101 from the blade 15. Thereby, the main shaft 11B
While the workpiece 101 is fed at low speed or intermittently by the low speed feed rotation, the blade 15 is fed and moved to the X axis and the Z axis. Various processing shapes can be easily processed. To perform hexagonal processing using a conventional lathe,
The tool post 13 is provided with a plurality of specifications including a Y-axis cutting motion drive unit, and the tool post 13 is reciprocated in the Y-axis direction while the workpiece 101 is stopped at each fixed rotation angle position, so that each hexagonal surface is moved. It is necessary to cut sequentially, and the roughness of the cut surface is lower than that of the ultrasonic vibration cutting device 10 of the present invention.

(Ultrasonic vibrating body 14) (FIG. 2) As shown in FIG. 2, the ultrasonic vibrating body 14 has a horn 23 connected to a front surface of a torsional vibrator 21 through a vibration transmission cone 22, as shown in FIG. The above-mentioned blade 15 is detachably attached to a blade mounting portion on the outer peripheral surface of the tip of the horn 23. The torsional vibrator 21 and the cone 22 are connected by a fastening bolt 24 provided on their central axis, and the cone 22 and the horn 23 are connected by a fastening bolt 25 provided on their central axis. At this time, the ultrasonic vibrator 14 resonates with the amplitude distribution of the torsional vibration as illustrated in FIG. 2A by driving the torsional vibrator 21, and the blade 15 is provided corresponding to the antinode of the vibration. It vibrates greatly, and is subjected to vibration cutting.

(Torsion Vibrator 21) (FIGS. 3 and 4) As shown in FIG. 3A, the torsion vibrator 21 is a bolted Langevin-type torsional vibrator, and has a disc-shaped torsional vibration mode. The front body 3 is provided on both sides of the electrostrictive elements 31 and 32.
3 and a back body 34, an electrode plate 35 is disposed between the electrostrictive elements 31 and 32, and electrode plates 36 and 37 are disposed outside each of the electrostrictive elements 31 and 32. They are connected by fastening bolts 38 provided on their central axes. The electrostrictive elements 31 and 32 are set to have the same polarity with respect to the electrode plate 35.

In the torsional vibrator 21, the front body 33
And a contraction mode in which the diameter of the back body 34 is reduced in a direction away from the electrostrictive elements 31 and 32. The front body 33 and the back body 34 of the present embodiment are stepped cylinders in which the diameters of the large-diameter portion (φD) and the small-diameter portion (φnD) (diameter ratio n <1) change stepwise and discontinuously. The steps are provided with R (R = D (1-n) / 2). The torsional vibrator 21 of the present embodiment has a large diameter portion (φ
D) The length is mL (degenerate length ratio m), and the electrostrictive element 3
Both sides of 1, 32 are symmetric with respect to the left and right surfaces.

However, according to the torsional vibrator 21, the resonance frequency of the torsional vibrator 21 can be increased while the torsional vibrator 21 has a fixed length L. That is, FIG. 3B shows the torsional resonance frequency ratio (f / f ₀ ) of the torsional vibrator 21 to the degenerate mode diameter ratio n when the degenerate length ratio m = 0.5 (when n = 1). Torsional resonance frequency f ₀ ). According to FIG. 3B, by reducing the diameter ratio n of the torsional vibrator 21 in the degenerate mode (degenerate),
It can be seen that the resonance frequency ratio is greater than 1 and can therefore be increased. For example, the total length L of the torsional vibrator 21
When the degenerate length ratio m = 0.5 and the diameter ratio n = 0.7 when the diameter D of the large diameter portion = 80 mm and the diameter D of the large diameter portion is 50 mm, the resonance frequency can be increased from 20 kHz in the case of a straight shape to 27 kHz.

Further, according to the torsional vibrator 21, the output power of the torsional vibrator 21 can be increased while the torsional vibrator 21 has a fixed length L. That is, FIG.
(C) shows the output power ratio (w of the torsional vibrator 21 to the diameter ratio n of the degenerate mode when the degenerate length ratio m = 0.5.
/ W ₀ ) (output power w ₀ when n = 1). FIG.
According to (C), it is recognized that the output power ratio can be made larger than 1 and thus increased by making the diameter ratio n of the degenerated mode of the torsional vibrator 21 smaller than 1 (degenerated). For example, when the total length L of the torsional vibrator 21 is 80 mm and the diameter of the large-diameter portion is 50 mm, if the degenerated length ratio m = 0.5 and the diameter ratio n = 0.7, the output power becomes 3 in the case of a straight shape.
5% increase.

The torsional vibrator 21 includes an electrostrictive element 31,
The connection between the front body 32, the front body 33, the back body 34 and the like may not necessarily be performed by the fastening bolt 38 but may be performed by a press-fit pin or an adhesive.

The degenerate mode applied to the torsional vibrator 21 may be one in which the front body 33 and the back body 34 are asymmetrical to the left and right, or one in which only one of the front body 33 and the back body 34 is provided. The diameter is not limited to being changed stepwise in two or more steps in a discontinuous manner, but may be changed continuously in a linear or curved shape such as a taper.

(Tool Post 13) (FIG. 4) The tool post 13 has a base 41 and a swivel base 42 as shown in FIG. 4, and the base 41 is fixed to the tool base body 13A. Reference numeral 42 is pivotally supported by the base 41 to hold the ultrasonic vibrator 14.

The base 41 is provided with a bolt 4 on the tool post body 13A.
A bottom plate 44 fixed by 3 is provided, and an elevating plate 45 is screwed around the outer periphery of the bottom plate 44, and a receiving plate 47 slidably fitted to a guide pin (not shown) pressed into the bottom plate 44. It is placed on the upper surface of the lifting plate 45. The receiving plate 47 supports the swivel table 42, and moves up and down together with an elevating plate 45 which is moved up and down by being rotated with respect to the bottom plate 44, and sets the level of the swivel table 42 (and thus the vibrator 14 and the blade 15). (Set level) can be adjusted. In the base 41, a support shaft (not shown) is erected at the center of the bottom plate 44, a fixed knob 50 is screwed to the support shaft, and a thrust bearing 5 is mounted on the lower surface of the knob 50.
0A. That is, the base 41 supports the turntable 42 to be able to turn around the support shaft between the receiving plate 47 and the thrust bearing 50A of the fixed knob 50.

The swivel table 42 is a combination of the holders 51 and 52, and the holder 52 holds the ultrasonic vibrator 14 between itself and the holder 51.

Here, the holders 51 and 52 of the swivel table 42 are used.
As shown in the following (A) and (B), two positions separated in the axial direction of the ultrasonic vibrator 14
Are held in line contact along the circumferential direction, and the holding state of the vibrating body 14 can be changed by rotating in the circumferential direction of the vibrating body 14.

(A) The ultrasonic vibrator 14 is provided with a flange 22A at a portion that serves as a node of the vibration of the cone 22, and this flange 22A is sandwiched from above and below by a holder 51 and a holder 52, and this is bolted (not shown). ).
The holding tool 51 and the holding tool 52 engage the flange 22A in a groove provided on the inner periphery thereof, and the vibrating body 14
The flange 22A is held in line contact along the circumferential direction.

(B) The ultrasonic vibrator 14 has upper and lower half rings 56A,
6B, and the horn 23 is held in line contact along the circumferential direction of the vibrating body 14 by protrusions 57 provided in the circumferential direction of the inner circumference thereof. The half ring 56A is fixed to the holder 51 by a bolt (not shown), and the half ring 56B is supported by a bolt (not shown) implanted in the holder 52 through an elongated hole in the vertical direction. The upper surface of the half ring 56B is bolted to a half ring 56A by a bolt 59
Side, the two half rings 56A, 56A
B holds and holds the vibrating body 14.

According to the above (A) and (B), when the ultrasonic vibrator 14 is mounted and held on the tool post 13, the mounting is performed by the vibrator 1.
The vibration characteristics of No. 4 are not adversely affected. Further, the holders 51 and 52 of the swivel table 42 are as described in the above (A).
In (2), the bolt (not shown) is loosened, and the bolt 59 is loosened in (B) above, so that the holding state of the ultrasonic vibrating body 14 can be changed by rotating in the circumferential direction of the vibrating body 14, The position setting of 15 (for example, setting of the rake angle of the cutting edge of the cutting tool 15) can be changed.

Accordingly, in the tool rest 13, the tool 15 of the ultrasonic vibrator 14 is held on the swivel 42 and the knob 5
0, the swivel table 42 is turned, and the blade 15
Can be set as a cutting operation position for the workpiece 1. In addition, the level of the cutting blade of the blade 15 can be changed steplessly by raising and lowering the receiving plate 47 by rotating the lifting plate 45 on the base 41.

(Cutting Tool Attachment of Vibrating Body 14) (First Embodiment) (FIGS. 5 and 6) In the ultrasonic vibration cutting apparatus 10, as shown in FIG.
A cutting tip 61 is used as the cutting tool 15.
And the presser foot 62 are attached to the blade mounting portion 64 provided on the horn 23 of the vibrating body 14 by the presser screw 63. That is, as shown in FIGS. 5 and 6, the vibrating body 14 is provided with a blade mounting portion 64 by a chip mounting groove 65 recessed in the outer peripheral portion of the front end of the horn 23 and a screw insertion portion 66 cut out in the outer peripheral portion of the front end. Is composed. Then, the chip mounting groove 65
The above-mentioned screw insertion portion 6 formed on one of the groove side portions facing each other
6, a holding screw 63 is screwed onto the female screw portion 66A, and a chip seating surface 67 is provided on the other side. The cutting tip 61 and the presser foot 62 seated on the chip seating surface 67 are pressed against the chip seating surface 67 by the holding screw 63. I will keep it.

It should be noted that the vibrating body 14 does not necessarily need to form only the tip mounting groove 65 and form the screw insertion portion 66 with a notch to form the blade mounting portion 64. That is, the female screw portion 66A may be formed so as to penetrate from the non-notched outer peripheral portion of the horn 23 to the chip mounting groove 65.
The unbalance of the moment of inertia around the central axis of the vibrating body 14 can be reduced.

Here, the chip seating surface 67 has three support portions 6 for supporting three points on the outer peripheral side of the cutting tip 61, respectively.
7A to 67C are arranged separately from each other. Then, the chip seating surface 67 is subjected to a spray treatment of a high hardness material such as ceramic,
Alternatively, a surface hardening process such as a nitriding process is performed to make the surface hardness of this portion (the chip seating surface 67) of the horn 23 equal to the hardness of the cutting tip 61.

As shown in FIG. 5, the cutting tip 61 has a cutting edge 6
1A, and a positioning hole 61B for the presser foot 62 at the center thereof. As shown in FIG. 5, the presser foot 62 includes a chip breaker 62A and a positioning projection 62B that engages with a positioning hole 61B of the cutting tip 61. As a result, the cutting tip 61 is seated on the tip seating surface 67 provided on the horn 23, and the presser foot 62 is placed on the cutting tip 61 (the positioning hole 61).
B), and the cutting tip 61 is pressed and held on the above-mentioned tip seating surface 67 via the presser foot 62 by a screw 63 screwed into the female screw portion 66A of the horn 23. At this time, the tip 63A of the screw 63 is
And presses and holds the cutting tip 61 against the back surface of the cutting tip 61.

Therefore, according to the present embodiment, the following operations are provided. When attaching the cutting tip 61 to the outer peripheral portion of the vibrating body 14 where the amplitude of the torsional vibration is maximized, the cutting tip 61
Inside the chip mounting groove 65 by the chip seating surface 67 on one side of the chip mounting groove 65 and the holding screw 63 on the other side.
The vibrating body 14 is sandwiched from both sides in the circumferential direction. Thereby, the exciting force of the torsional vibration generated by the vibrating body 14 is applied from both sides, and the torsional vibration energy generated by the vibrating body 14 is stably supplied to the cutting tip 61, so that a stable cutting state can be secured.

By using a presser foot 62 of an appropriate size in combination with the cutting tip 61, the thrust of the holding screw 63 can be applied to the outer peripheral portion of the cutting tip 61, and the cutting edge 61A portion of the outer periphery of the cutting tip 61 A strong fastening state without relative displacement can be provided. Thereby, the cutting tip 61 generates the same vibration as the vibration originally applied by the vibrating body 14, and the cutting tip 61 does not relatively displace with respect to the vibrating body 14, thereby preventing the cutting tip 61 from being broken and the screw 63 from being loosened. As a result, the vibration energy generated by the vibrating body 14 can be stably supplied to the cutting tip 61 to ensure a stable cutting state.

The screw 63 abuts against the back surface of the presser foot 62 to press and hold the same. The size of the screw 63 does not depend on the mounting hole of the cutting tip 61, so that it can be made thicker.
As a result, a large thrust can be applied to the cutting tip 61 to increase the fixing force, and the vibration energy generated by the vibrating body 14 can be stably supplied to the cutting tip 61 to secure a stable cutting state as described above.

The presser foot 6 is separate from the cutting tip 61.
2 is provided with a chip breaker portion 62A, it is sufficient to prepare a chip breaker portion 62A suitable for each cutting condition together with the presser foot 62. The cost can be reduced as compared with the case of preparing. This makes it easy to break even thin chips or easily control the direction of chip discharge in micro-cut cutting, etc., made possible by vibration cutting that can reduce the cutting resistance, and as a result, to prevent damage to the workpiece due to chips, The disposal can be simplified.

By providing three support portions 67A to 67C on the chip seating surface 67 of the vibrating body 14 and supporting three points on the outer peripheral side of the cutting tip 61, the cutting tip 61 is displaced relative to the vibrating body 14. Can be supported without any problems. Thereby, the vibration energy generated by the vibrating body 14 is stably supplied to the cutting tip 61 in the same manner as described above, and a stable cutting state can be secured.

The chip seating surface 67 of the vibrator 14 was subjected to a surface hardening treatment. Thus, wear of the chip seating surface 67 of the vibrating body 14 can be prevented, and the vibrating body 14 can have a long service life and cost reduction.

(Second Embodiment) (FIG. 7) In the second embodiment, a plurality of positions (two positions in this embodiment) equally divided in the circumferential direction of the outer peripheral portion of the horn 23 of the vibrator 14.
At each of two positions symmetrical with respect to the center axis of the horn 23, the blade mounting portion 24 for the cutting tip 61 as the blade 15 is provided. The cutting tip 61 is
3, the blade is fixedly held on the chip seating surface 67 (three support portions 67A to 67C) of the blade mounting portion 64.

In the present embodiment, the horn 23 of the vibrating body 14
Although the blade mounting portion 64 is notched in the outer peripheral portion, the blade mounting portion 64 may be recessed like the chip mounting groove 65 of the first embodiment, and a wedge-shaped chip mounting groove described later in the third embodiment. It may be provided as follows.

The cutting tip 61 may use the presser 62 as in the first embodiment, and may be fixed and held by the press screw 63 as in the first embodiment.

Therefore, according to the present embodiment, the following operations are provided. Since the blade mounting portions 64 are equally arranged at a plurality of positions in the circumferential direction of the vibrating body 14, the unbalance of the moment of inertia around the central axis of the vibrating body 14 can be reduced. Thereby, the vibrating body 1
The blade mounting portion 64 can be formed without inhibiting the stability of the torsional vibration of No. 4 and without inducing abnormal vibration.
The torsional vibration energy generated by the vibrating body 14 is stably supplied to the cutting tip 61 to ensure a stable cutting state.

A plurality of types of cutting tips 61 can be attached to one vibrating body 14 at the same time, and it is not necessary to replace the vibrating body 14 each time a plurality of types of cutting tips 61 are used, so that cutting workability can be improved.

(Third Embodiment) (FIG. 8) In the third embodiment, the blade mounting portion 72 for the wedge-shaped cutting tip 71 is provided on the outer peripheral portion of the horn 23 of the vibrator 14 in the radial direction of the horn 23. A wedge-shaped tip mounting groove 73 that becomes narrower toward the outside of the horn, and a holding screw 75 that is screwed to a screw portion 74 to be provided on the back side of the tip mounting groove 73 of the horn 23. did. Cutting tip 71
Is mounted in the chip mounting groove 73, pressed from the back surface by a holding screw 75, wedge-coupled to the chip mounting groove 73, and fixedly held.

Therefore, according to the present embodiment, the following operations are provided. The cutting tip 71 is wedge-coupled to a wedge-shaped tip mounting groove 73 provided in the vibrating body 14, and the cutting tip 71 is sandwiched from both sides in the circumferential direction of the vibrating body 14. Thereby, the exciting force of the torsional vibration generated by the vibrating body 14 is applied from both sides, and the torsional vibration energy generated by the vibrating body 14 is stably supplied to the cutting tip 71, so that a stable cutting state can be secured.

The cutting tip 71 is wedge-coupled to the tip mounting groove 73 of the vibrator 14.
By protruding and disposing only the cutting edge portion of the cutting tip outside the chip mounting groove 73, a strong fastening state in which the entire cutting tip 71 is not relatively displaced by the vibrator 14 is provided. Further, since the cutting tip 71 is a wedge itself and has a function as a fastening part, the number of fastening parts for the cutting tip 71 is reduced, and the heat generation surface between the cutting tip 71 and the vibrating body 14 is reduced. It is possible to reduce the torsional vibration transmission efficiency due to the reduction and the presence of the mass of the fastening part.
As a result, the cutting tip 71 can more reliably induce the same vibration as the vibration originally given by the vibrating body 14, and the torsional vibration energy generated by the vibrating body 14 is stably supplied to the cutting tip 71 to achieve a stable cutting state. Can be secured.

The cutting tip 71 is wedge-coupled to the tip mounting groove 73 of the vibrating body 14.
Only the cutting edge portion of the tip is projected out of the chip mounting groove 73, and the cutting tip 71 and most of the holding screw 75 are
The torsional vibration of the vibrating body 14 is small and its influence on the vibration is minimized. By incorporating the vibrating body 14 on the central axis side, torsional vibration of stable and high output power can be efficiently performed with small energy. Can be maintained.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design may be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0060]

As described above, according to the present invention, the vibration energy generated by the torsional vibrator can be stably supplied to the cutting tip, and a stable cutting state can be secured.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an ultrasonic vibration cutting device.

FIG. 2 is a schematic diagram showing an ultrasonic vibrator.

FIG. 3 is a schematic view showing a torsional vibrator.

FIG. 4 is a schematic view showing a tool rest.

FIG. 5 is a schematic diagram showing a state in which a blade is mounted on a blade mounting portion of the vibrating body according to the first embodiment.

FIG. 6 is a schematic view showing a blade attachment portion of a vibrating body.

FIG. 7 is a schematic diagram showing a state in which a blade is mounted on a blade mounting portion of a vibrating body according to a second embodiment.

FIG. 8 is a schematic view showing a state in which a blade is mounted on a blade mounting portion of a vibrating body according to a third embodiment.

FIG. 9 is a schematic diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration cutting device 14 Vibration body 21 Torsional vibrator 61 Cutting tip 63 Holding screw 64 Blade mounting part 65 Chip mounting groove 67 Chip seating surface 71 Cutting tip 72 Blade mounting part 73 Chip mounting groove 75 Holding screw

Claims (3)

[Claims] 1. A torsional vibration cutting device comprising a cutting tip mounted on a blade mounting portion provided on an outer peripheral portion of a vibrating body driven by a torsional vibrator, wherein the blade mounting portion is recessed on an outer peripheral portion of the vibrating body. A chip mounting groove is provided, and a holding screw is screwed into one of the opposing groove side portions of the chip mounting groove, and a chip seating surface is provided on the other of the opposing groove side portions of the chip mounting groove, and a chip seating surface is provided. A cutting tip seated on a torsion vibration cutting device, wherein a presser screw can press and hold the cutting tip on the tip seating surface. 2. A torsion vibration cutting device comprising a cutting tip mounted on a blade mounting portion provided on an outer peripheral portion of a vibrating body driven by a torsional vibrator, wherein a plurality of cutting tools are provided at a plurality of circumferential positions on an outer peripheral portion of the vibrating body. A torsion vibration cutting device, wherein each of the blade mounting portions is equally divided. 3. A torsional vibration cutting device comprising a cutting tip mounted on a blade mounting portion provided on an outer peripheral portion of a vibrating body driven by a torsional vibrator, wherein the blade mounting portion is an outer peripheral portion of the vibrating body, A wedge-shaped chip mounting groove having a narrow width toward the outside in the radial direction of the body was provided, and a holding screw was screwed on the back side of the chip mounting groove of the vibrating body, and the vibrating body was mounted in the chip mounting groove. A torsion vibrating body cutting device comprising a wedge-shaped cutting tip pressed by a holding screw and wedge-bonded to the tip mounting groove.