JPH10505A - Rotary vibration tool holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit rotation of a machine spindle of a cutting apparatus to a cutting tool with a simple configuration and at a low cost, and to generate an axial vibration in the cutting tool. SOLUTION: An input shaft 10 of a rotary vibration tool holder connected to a machine spindle rotates, rotation of the input shaft is transmitted to an output shaft 20, and a drill attached to the other end 24 of the output shaft rotates. Drilling is performed. Due to the rotation of the output shaft, the end surface of the output shaft is in contact with the sphere 48 held by the sphere holding member 47. Therefore, when the concave portion 21a formed in the end surface comes into contact with the sphere, the output shaft has a step difference of the end surface. Moves to the input shaft side, and performs periodic vibration in the axial direction. For this reason, the bottom surface of the drilled hole becomes uneven, but the trajectory of the tip cutting edge accompanying the rotation of the drill is selectively cut by vibration in the axial direction, so that chips can be separated. As a result, the chips do not wind around the drill during the rotation of the drill, so that it is not necessary to remove the wound chips and continuous drilling can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary vibration tool holder capable of transmitting rotation of a machine spindle of a cutting device to a cutting tool and generating axial vibration.

[0002]

2. Description of the Related Art
In a cutting device, when a cutting tool such as a drill needs vertical vibration in the axial direction at the same time as rotation, the rotation of the cutting tool is performed on the machine spindle to which the tool is attached, and the vertical vibration is placed on the processing table. It has been performed by setting a workpiece on the installed vibration device and driving the vibration device.

However, the above-mentioned vibration device is usually a mechanical device combining a motor and a cam, or a hydraulic device using a hydraulic cylinder, so that the device becomes large and complicated, and a wide space for installation is required. There is a problem that space is required and the cost is high. SUMMARY OF THE INVENTION The present invention is intended to solve the above-described problems, and is an inexpensive rotary vibration that can transmit the rotation of a machine spindle of a cutting apparatus to a cutting tool with a simple configuration and generate axial vibration in the cutting tool. It is an object to provide a tool holder.

[0004]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural feature of the invention according to claim 1 is that one of a machine spindle and a cutting tool of a cutting machine at one end side. A first shaft member fixed and having an engagement shaft portion protruding coaxially on the end surface at the other end side, and disposed coaxially with the first shaft member, and the other end of the machine main shaft and the cutting tool at one end side A plurality of locking recesses provided coaxially on the end face at the other end side and having the engaging shaft portion fitted therein, and formed at equal intervals in the circumferential direction around the locking recesses on the end face. An end recess is provided, and rotation torque can be transmitted to and from the first shaft member in a state where the engagement shaft is fitted into the engagement recess, and relative movement in the axial direction is enabled. A second shaft member, coaxially surrounding the first shaft member and the second shaft member, and coaxially coaxial with one portion of the inner peripheral surface in the axial direction; A cylindrical body having a protruding flange-shaped positioning projection, rotatably supporting a first shaft member via a bearing between a first stopper member provided on an inner wall on one end side and the positioning projection. A spherical rail composed of a ring-shaped groove concentrically with the second shaft member is provided on the end surface of the positioning projection on the second shaft member side, and the cutting device is provided independently of the first shaft member and the second shaft member. An annular body loosely fitted to the engaging shaft portion between the other end of the second shaft member and the positioning convex portion, wherein the annular member is the same number as the end surface concave portion or a fraction of the integer number at equal intervals in the circumferential direction. And a sphere holding member provided with a plurality of holding holes for holding 3 to 9 spheres, and a plurality of spheres held by the holding holes and inserted into the rail and abutting on the other end surface of the second shaft member. And coaxially mounted on the outer peripheral wall of the second shaft member near the other end of the second shaft member, and A bearing member in which the movement of the second shaft member in the direction of the other end surface is stopped by the movement preventing means provided on the outer peripheral wall of the material; A spring member that is externally inserted into the second shaft member and biases the second shaft member toward the first shaft member by elastic force.

[0005] In the invention according to claim 1 configured as described above, the first shaft member and the second shaft member start rotating integrally by the rotation of the machine main shaft. At this time, while the sphere is rolling on the rail provided on the positioning projection of the housing and held by the sphere holding member, the sphere alternately contacts the flat portion and the end surface recess at the other end surface of the rotating output shaft. On the other hand, the second shaft member is urged toward the first shaft member by a spring member. Therefore, the second shaft member slightly moves toward the first shaft member when the contact of the sphere moves from the flat portion to the end surface concave portion, and when the contact of the sphere moves from the end surface concave portion to the flat portion, Position and repeat this operation continuously. As a result, the second shaft member repeats the vibration that reciprocates a predetermined distance in the axial direction, and this vibration is transmitted to the cutting tool fixed to the second shaft member.

[0006] As a result, the bottom surface of the drilled hole formed by a cutting tool such as a drill becomes uneven, but the locus of the cutting edge at the tip of the tool accompanying the rotation of the cutting tool has a convex portion due to vibration in the axial direction. Since the cutting is performed selectively, the chips can be not continuous but divided. for that reason,
Since the chips do not wind around the tool during rotation of the cutting tool, it is not necessary to remove the chips and continuous drilling can be performed.

According to a second aspect of the present invention, there is provided the rotary vibration tool holder according to the first aspect, wherein the end of the engaging shaft portion of the first shaft member is coaxial with the end surface. In addition to the above, an engaging recess is provided, and a locking shaft fitted into the engaging recess is provided on the other end surface of the second shaft member instead of the locking recess. In the invention according to claim 2 configured as described above, since only the connection relationship between the first shaft member and the second shaft member is changed, the same effect as the invention described in claim 1 can be obtained by this. can get.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are sectional views of a rotary vibration tool holder used in a cutting apparatus according to a first embodiment. This is shown in the figure. The rotary vibration tool holder has an input shaft 10 connected to a machine spindle of the cutting device.
And an output shaft 20 coaxially connected to the input shaft 10 and holding a drill at the tip, and a housing 30 that rotatably covers and supports the input shaft 10 and the output shaft 20.

The input shaft 10 has a cylindrical base 11. The base portion 11 is provided with a shank 11a connected to a machine main shaft (not shown) of the cutting device, and an engagement portion 11 in which one end of the shank 11a is slightly enlarged in diameter.
b. The engaging portion 11b is a flange portion 11b1 whose end surface 12 side slightly protrudes outward. The end face 12 is provided with a columnar engagement shaft portion 13 that protrudes coaxially from the base portion 11 and has a smaller diameter than the shank 11a. A flat tongue-shaped protrusion 13 a is formed coaxially at the tip of the engagement shaft 13. An output shaft 20 is coaxially arranged on the engagement shaft portion 13 side of the input shaft 10.

The output shaft 20 has a cylindrical shape, and is provided coaxially with an engagement concave portion 22 into which the engagement shaft portion 13 is inserted toward the other end 24 side on an end surface 21 on the input shaft 10 side. The output shaft 20 is provided at the inner end position N of the engagement concave portion 22 so as to radially penetrate a vertically long, substantially elliptical through-hole 23 extending in the axial direction with the inner end position N being substantially the center. . The periphery of the engagement recess 22 of the end face 21 is a projection 21a that projects in a ring shape.

The periphery of the protruding portion 21a is a flat portion 21.
As shown in FIG. 2, the flat portion 21b has three lug-shaped concave portions 21c which are inclined at a predetermined angle, for example, 12 ° outward at equal intervals of 120 ° in the circumferential direction.
It is provided in places. A ring-shaped groove 27 for mounting a C-shaped retaining ring 28 is formed on the outer peripheral surface near the end surface 21 of the output shaft 20.

The other end 24 of the output shaft 20 is a grip 25 having a tapered portion. At the axial center position of the other end 24, a gripping concave portion 25a, which is a cylindrical cavity, is formed coaxially toward the end surface 21, so that a rotary tool with a shank, for example, a drill (not shown) is inserted. . The grip portion 25 has a grip recess 25
a, two screw holes 26 are formed side by side in the axial direction, and by screwing a screw into the screw hole 26, the drill in which the holding concave portion 25a is inserted
To be fixed with screws.

The housing 30 has a thin cylindrical shape, and has ring-shaped grooves 33, 34 in which wire retaining rings 33a, 34a are mounted coaxially on inner peripheral surfaces near both ends 31, 32, respectively. A ring-shaped flange 35 protruding in the axial direction is provided on the one end 31 behind the ring-shaped groove 33. The flange portion 35 has a two-step shape of a first protrusion 35a having a small protrusion on the one end 31 side and a second protrusion 35b having a large protrusion on the back side. The diameter of the center hole of the second protrusion 35b is , Slightly larger than the diameter of the engagement shaft portion 13. An annular plate-shaped sphere receiving member 4 is provided on the inner side surface of the second convex portion 35b.
1 is fixed. The center hole of the sphere receiving member 41 is larger than the diameter of the engagement shaft portion 13 of the input shaft 10, and its exposed surface is coaxial with the input shaft 10 in accordance with the radial position of the above-mentioned moon-shaped concave portion 21 c. A spherical rail 41a formed of the provided ring-shaped groove is formed.

An engagement portion 11b and an engagement shaft portion 13 of the input shaft 10 are inserted from one end 31 of the housing 30. A radial bearing 42 is externally fitted to the engaging portion 11b, and a thrust bearing 43 is externally fitted to the engaging shaft portion 13. In the input shaft 10, the engagement shaft portion 13 passes through the second convex portion 35 b and the center hole of the sphere receiving member 41.
b is disposed coaxially inside the housing 30 by a radial bearing 42 on the inner side of the ring-shaped groove 33. The radial bearing 42 is positioned between the wire retaining ring 33a, which is the first retaining member mounted on the ring-shaped groove 33, and the flange 11b1 at the tip of the engaging portion 11b of the input shaft 10. The end surface 12 of the input shaft 10 is pressed against the side surface of the second convex portion 35b of the flange portion 35 via the thrust bearing 43. Thus, the input shaft 10 is rotatably supported in the housing 30 on one end 31 side of the housing 30.

The output shaft 20 is coaxially inserted from the other end 32 side of the housing 30 with a part thereof protruding from the other end 32. The engaging shaft 13 of the input shaft 10 is fitted into the engaging recess 22 of the output shaft 20.
The tongue-shaped projection 13a at the tip of the third is locked in the through hole 23 at the tip of the engaging recess 22. Thereby, the torque of the input shaft 10 is transmitted to the output shaft 20. A gap is provided between the tip of the engaging shaft 13 and the inner end of the engaging recess 22 and between the tip of the tongue-shaped projection 13a and the tip of the through-hole 23. It can be vibrated in the axial direction with respect to the 10 side.

The output shaft 20 is provided with a radial bearing 44 positioned by a wire retaining ring 34a as a second stopper member provided near the other end 32 of the housing 30, and near the end surface 21 of the output shaft. The radial bearing 45 positioned by the C-shaped retaining ring 28 is fitted outside. Thus, the output shaft 20 is supported in the housing 30 so as to be coaxial and rotatable. And the radial bearing 4
Between the bearings 44 and 45, a coil spring 46 is wound around the output shaft 20, and the elastic force of the coil spring 46 acts between the two bearings 44 and 45 to attach the output shaft 20 in the direction of the input shaft 10. It is getting energized.

The end surface 21 of the output shaft 20 and the sphere receiving member 41
An annular plate-shaped sphere holding member 47 is provided between the engagement shaft portions 13.
Is loosely fitted. As shown in FIG. 3, the sphere holding member 47 is provided with circular holding holes 47a penetrating at three locations at 120 ° intervals in the circumferential direction, and a spherical sphere 48 is held in the holding holes 47a. . A part of the sphere 48 is fitted and held on the rail 41 a of the sphere receiving member 41, and the opposite side is provided on the end face 21 of the output shaft 20. The ring 49 is inserted as a stopper for preventing the sphere 48 from dropping out of the holding hole 47a when the output shaft 20 is largely pulled out against the coil spring 46.

Next, the operation of the first embodiment will be described. When the driving of the cutting device is started, the input shaft 10 of the rotary vibration tool holder connected to the machine main shaft rotates, and the rotational force of the input shaft 10 is transmitted to the output shaft 20,
The drill attached to the other end 24 side of the output shaft 20 rotates to perform a drilling process. At this time, as the output shaft 20 rotates, the sphere 48 held by the sphere holding member 47 rolls in the rail 41 a of the sphere receiving member 41 while the output shaft end face 21
Alternately contact the flat portions 21b and the concave portions 21c. On the other hand, the output shaft 20 is urged in the direction of the input shaft 10 by the coil spring 46.

Therefore, when the contact of the sphere 48 shifts from the flat portion 21b to the concave portion 21c, the output shaft 20
0 slightly, and contact of the sphere 48 is
When moving from c to the flat portion 21b, it is returned to the original position,
This operation is repeated continuously. Thereby, the output shaft 20
The vibration periodically reciprocates back and forth between a predetermined distance in the axial direction, and this vibration is transmitted to the drill fixed to the output shaft 20. Here, since the number of spheres and the number of concave portions on the end face of the output shaft 20 are the same, the frequency generated during one rotation of the output shaft 20 is about 1.5. Thereby, the tip of the drill attached to the output shaft 20 exhibits an amplitude variation similar to a sinusoidal shape at the tip as shown in FIG. In addition, FIG.
This is to explain the state when the feed amount per rotation is equal to the amplitude.

Therefore, although the bottom surface of the drilled hole becomes an uneven surface, the trajectory of the tip cutting edge due to the rotation of the drill is obtained by selectively cutting the hatched portion in FIG. 4 by vibration in the axial direction. In addition, the chips can be not continuous but divided. As a result, the chips do not wind around the drill during the rotation of the drill, so that it is not necessary to remove the chips and continuous drilling can be performed. In particular,
Even with elastic materials such as synthetic resin and rubber materials, the cutting edge is good, and chips are not wrapped around the rotating tool, so it can be drilled without scratching around the hole. It is possible to proceed to the next hole processing, and the processing operation can be performed smoothly. In the above embodiment, the input shaft 10 and the output shaft 20 can be used in reverse.

Next, a second embodiment will be described. In the second embodiment, as shown in FIG. 5, the input shaft 50 is provided with a columnar base 51 similarly to the input shaft 10 of the rotary vibration tool holder shown in the first embodiment. An engagement shaft portion 53 is coaxially provided on an end surface 52 of the base portion 51 on the engagement portion 51b side. And the engagement shaft 5
3, an engagement recess 54, which is a cylindrical cavity, is formed coaxially from the distal end 53a toward the base 51, and extends to an axially intermediate portion of the engagement portion 51b. Then, the engagement recess 54
A substantially elliptical through-hole 55 extending in the axial direction with the inner end substantially at the center is provided to penetrate in the radial direction. The insertion of the input shaft 50 into the housing 70 is the same as that shown in the first embodiment.

The output shaft 60 has a small-diameter grip 61a.
And a base portion 61 in which a large diameter engaging portion 61b is coaxially arranged. On the end face 62 of the base 61 on the side of the engaging portion 61b,
A cylindrical engagement shaft portion 63 fitted into the engagement recess 54 of the engagement shaft portion 53 is provided coaxially. Engagement shaft 63
A flat tongue-shaped projection 63a is formed coaxially at the tip end of. The engagement shaft portion 63 of the output shaft 60 is inserted into the engagement recess 54 of the input shaft 50, and between the inner end of the engagement recess 54 and the tip of the engagement shaft portion 63, and between the tip of the through hole 55 and the tongue. A gap is provided between the tips of the shaped protrusions 63a. Thus, the torque of the input shaft 50 is transmitted to the output shaft 60, and the output shaft 60 can vibrate in the axial direction with respect to the input shaft 50.

The end portion 62 of the output shaft 60 projects outward to form a stopper 62a. A thrust bearing 81 is externally fitted to the engaging portion 61b, and abuts against the stopper portion 62a to restrict movement in the direction of the end face 62. The output shaft side end 71 of the housing 70 is provided with a ring-shaped groove 72 for mounting a C-shaped retaining ring 72a. A disc spring 82 is provided between the C-shaped retaining ring 72a and the thrust bearing 81, and the output shaft 60 is urged toward the input shaft 50 by the elastic force of the disc spring 82. Other configurations are the same as those in the first embodiment, and a description thereof will be omitted.

The rotary vibration tool holder according to the second embodiment configured as described above has the same function and effect as the first embodiment. Further, also in the second embodiment, the input shaft 50 and the output shaft 60 can be used in reverse.

It should be noted that the number of the spheres 48 shown in each of the above embodiments is required to be three or more in order to obtain a well-balanced vibration that is hardly inclined when contacting the output shaft end face. is there. However, when the number of the spheres 48 is 10 or more, the diameter of the sphere holding member 47 becomes too large or the amplitude cannot be sufficiently obtained.

When the number of recesses on the output shaft end face is an odd number times the number of the spheres 48, chips can be separated by adjusting the relationship between the feed amount per rotation and the amplitude. In the case of double, the chip cannot be divided if the number of drill bits is one. Therefore, in this case, the number of blades needs to be two or more.

Further, the uneven shape of the end face of the output shaft is not limited to the one shown in the above embodiment, and it is necessary to change the shape into a sinusoidal curve, a saw blade shape or the like so that a smooth vibration or a shock-like vibration is required. Can be generated according to Especially,
In processing a brittle inorganic material or the like, impact vibration is advantageous. Therefore, it is necessary to adjust the shape of the end face of the output shaft accordingly. Further, by selecting the vibration mode, it is possible to make an adjustment so as to extend the tool life.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rotary vibration tool holder according to a first embodiment of the present invention.

FIG. 2 is a plan view showing an end surface of an output shaft of the rotary vibration tool holder.

FIG. 3 is a plan view showing a sphere holding member of the rotary vibration tool holder.

FIG. 4 is an operation explanatory diagram showing a rotation locus of a cutting blade of a drill mounted on a rotary vibration tool holder.

FIG. 5 is a cutaway view showing a rotary vibration tool holder according to a second embodiment.

[Explanation of symbols]

10: input shaft, 11: base, 11a: shank, 11b
... engaging portion, 11b1 ... flange portion, 12 ... end face, 13 ...
Engagement shaft part, 13a ... tongue-shaped projection part, 20 ... output shaft, 22 ...
Engaging concave portion, 23: through hole, 21: end face, 21b: flat portion, 21c: concave portion, 25: gripping portion, 25a: gripping concave portion,
30 ... housing, 31 ... one end, 32 ... other end, 33, 3
4. Ring groove, 33a, 34a Wire retaining ring, 35
... Flange, 41 ... Sphere receiving member, 41a ... Rail, 42 ... Radial bearing, 43 ... Thrust bearing, 44, 45 ... Radial bearing, 46 ... Coil spring, 47 ... Sphere holding member, 48
... sphere, 50 ... input shaft, 53 ... engaging shaft, 54 ... engaging recess, 55 ... through hole, 60 ... output shaft, 61 ... base, 62 ...
End face, 62a: Stop, 63: Engagement shaft, 63a: Tongue-shaped projection, 70: Housing, 72: Ring-shaped groove, 72
a: C-shaped retaining ring, 81: thrust bearing, 82: disc spring.

Claims (2)

[Claims] A first shaft member fixed at one end to one of a machine spindle and a cutting tool of the cutting device, and having an engagement shaft portion coaxially protruding from an end surface at the other end; The other of the machine main shaft and the cutting tool is fixed at one end side and coaxially provided on the end face at the other end side so that the engagement shaft portion is inserted. A plurality of end face recesses having a stopping recess and being formed at equal intervals in the circumferential direction around the same locking recess on the same end face are provided, and the engagement shaft portion is inserted into the locking recess, and A second shaft member capable of transmitting rotational torque between the shaft member and the first shaft member and enabling relative movement in the axial direction; and coaxially surrounding the first shaft member and the second shaft member. And a cylindrical body having a flange-shaped positioning protrusion protruding coaxially in one direction at an inner peripheral surface, and a cylindrical body at one end side. The first shaft member is rotatably supported via a bearing between the first stopper member provided on the second shaft member and the positioning protrusion, and a second shaft member is provided on an end surface of the positioning protrusion on the second shaft member side. A spherical rail made of a ring-shaped groove is provided concentrically with the first rail.
A housing supported by the cutting device independently of the shaft member and the second shaft member; and an annular body loosely fitted to the engagement shaft portion between the other end of the second shaft member and the positioning projection. A sphere holding member provided with a plurality of holding holes for holding 3 to 9 spheres at the same number or a fraction of the number of the end face recesses at equal intervals in a circumferential direction; A plurality of spheres inserted into the rail and abutting on the other end surface of the second shaft member; and coaxial with an outer peripheral wall of the second shaft member near the other end of the second shaft member. A bearing member attached to the second shaft member and stopped by the movement preventing means provided on the outer peripheral wall of the second shaft member in the direction of the other end surface of the second shaft member; and the other end of the bearing member and the housing. The second shaft member is externally inserted between the second stopper members provided on the inner peripheral surface of the second shaft member. A rotary vibration tool holder, comprising: a spring member that is biased by an elastic force in a direction of a single shaft member. 2. The rotary vibration tool holder according to claim 1, wherein an engaging recess is provided coaxially on an end face at a tip of the engaging shaft portion of the first shaft member, and the second shaft member is provided. On the other end face of
In place of the locking recess, a locking shaft fitted into the engaging recess is provided, so that a rotational torque can be transmitted between the first shaft member and the second shaft member and a relative axial direction is provided. Rotary vibration tool holder characterized in that it is capable of dynamic movement.