KR20040060737A - Tubular piercing machine - Google Patents

Abstract

PURPOSE: A tubular piercing machine is provided to make connection and disconnection easy by rotating 90 degrees and to stably perform drilling without the loosening of connecting members by firmly connecting the connecting member with cam action. CONSTITUTION: A tubular piercing machine comprises a tubular machine body(22), a shank(24) and a connecting member(25). The connecting member is fitted to a second diameter portion(24b) of the shank. A cam pin(27) received in an axial hole(24f) of a first diameter portion(24a) has a protruded portion contacting a circumferential cam portion(25b) of the connecting member. The connecting member is pressurized toward the first diameter portion of the shank by an elastic member(28). When the connecting member is rotated relative to the shank, the cam pin moves axially and pressurizes a ring-shaped member(26). The diameter of the ring-shaped member is lengthened, and the cam pin is fixed by a positioning fixing portion(22b). Thus, the piercing machine body is connected with the shank.

Description

TUBULAR PIERCING MACHINE

The present invention relates to a cylindrical drilling tool which is a kind of so-called core drill.

As a conventional technique of this kind, the technique of Japanese Patent Laid-Open No. 6-312309 by the present applicant is shown in Figs. In the figure, the cylindrical tool main body 2 of the cylindrical drilling tool 1 has a small diameter cylindrical portion 2a (having an external thread 2b and one notch 2c at its outer periphery) at its upper end. The large diameter portion of the shank 3 (installing the drill 4) is inserted such that the flange portion 3a abuts on the upper end of the cylindrical portion 2a, and passes through the cutout portion 2c to prevent rotation of the pin 5. ) Is inserted into the large diameter portion of the shank, and the cap nut 6 (having the internal thread 6a inside) as a fastening member is screwed into the outer circumference of the small diameter cylindrical portion 2a. 7 is a snap ring 7. In this way, the main body 2 and the shank 3 are fastened to each other via the cap nut 6. In the use of the tool 1, the central drill 4 is first started drilling to the flat plate 8 to have a guiding action, and then the drilling is performed by the cylindrical cutting edge 2d below the main body 2. At the end, a large diameter hole 8a is formed. In addition, the central drill 4 does not necessarily need to be installed if the flat plate 8 has a preliminary hole of an inner diameter slightly smaller than the outer diameter of the cylindrical cutting edge 2d.

According to this, the rotational torque from the shank 3 is performed through the anti-rotation pin 5 and the notch 2c, so that the male thread 2b of the cylindrical portion 2a and the female thread of the cap nut 6 are formed during drilling. (6a) Since excessive tightening of each other is not performed, a special tool for removing the shank is unnecessary after the end of the work, and the shank 3 can be easily removed by only manual operation.

As another conventional technique, the technique of Japanese Patent Laid-Open No. 6-253721 by the present applicant is shown in Figs. 3 and 4, and the same reference numerals are given to the parts corresponding to Figs. In the drawing, the cylindrical tool body 2 of the cylindrical drilling tool 10 has the shank 3 screwed into the center of the first fastening member 11 fitted in one end thereof, and the shank 3 again. The cap nut 6 as the second fastening member is screwed to the outer circumferential male screw portion of the annular member 12 fitted in the " The first fastening member 11 receives the rotational torque from the shank 3 by the anti-rotation pin 5 inserted through one cutout portion 2c of the cylindrical tool body 2. ), And the ring-shaped member (C ring) 13 for fixing is received in the outer circumferential groove 11a (see FIG. 4) of the first fastening member 11, and at the same time, blood is circulated in one radial hole. The push pin 14 and the ball 15 are accommodated. In addition, a single pressing pin member 16 (a concave portion 16a and a lower portion thereof) is disposed in the coaxial hole (located eccentrically toward the center of the shank 3) of the annular member 12 and the first fastening member 11. Having a large diameter portion 16b] is fixed relative to the annular member 12 and is axially slidable relative to the first fastening member 11.

According to this, since the annular member 12 is fixed relative to the first fastening member 11 via the pressing pin member 16, the circumferential position is relatively fixed. ), The ring-shaped member 12 moves up and down by a screw coupling, and the large diameter portion 16b of the pressure pin member 16 passes through the ball 15 to radially press the pin 14 through the ball 15. Direction by moving outward to press the fixing ring-shaped member 13 in the same direction so as to be engaged with the inner circumferential engagement groove 2a (see FIG. 4) of the main body 2, and thus the main body 2 And fastening the first fastening member 11 to each other. According to this, the rotational torque during the drilling operation is only transmitted from the shank 3 to the main body 2 via the first fastening member 11, and the annular member 12, the cap nut 6, and the pressure pin member 16 are not provided. Since it does not work, it does not cause excessive tightening between the annular member 12 and the cap nut 16, so that a special tool for removing the shank after the end of work is unnecessary, and the cap nut 6 can be easily reversed by the manual operation only. It is possible to remove the shank 3 by rotating the pressing pin member 16 to move downward to correspond to the narrowed portion 16a to the ball 15 and to release the pressing of the fixing ring-shaped member 13.

However, there was a problem described below also in any of the first and second conventional examples.

① The cap nut (6) needs to be rotated many times when it is installed and removed.

② The cap nut 6 is loosened by the vibration during drilling.

(3) Since the rotational torque from the shank 3 was transmitted to the main body 2 only by the one pin 5 and the notch 2c of the main body 2, since the transmission area is small, the stress of this part becomes large. There was a risk that the pin 5 broke or cracked in the periphery of the cutout 2c.

The present invention aims to solve the above problem.

1 is a longitudinal sectional view of a first conventional example of a cylindrical drilling tool;

2 is a partial side view of the conventional example of FIG. 1;

3 is a longitudinal sectional view of a second conventional example of a cylindrical drilling tool;

4 is a partial side view of the conventional example of FIG. 2;

5 is a longitudinal sectional view of one embodiment of a cylindrical boring tool of the present invention;

6 is a longitudinal sectional view of an essential part of the embodiment of FIG. 5;

7 is a partial cross-sectional side view of the shank of the embodiment of FIG. 5;

8 is a plan view of the C ring of the embodiment of FIG.

9 is a bottom view of the embodiment of FIG. 5;

FIG. 10 is an arrow view for showing a cam groove of a fastening member along the 10-10 line in FIG. 5; FIG.

FIG. 11 is a partial longitudinal arrow view for illustrating a cam groove of a fastening member along the line 11-11 in FIG. 10; FIG.

12 is a longitudinal sectional view of an essential part of another embodiment of the cylindrical drilling tool of the present invention.

※ Explanation of symbols for main parts of drawing

1, 10, 21: cylindrical drilling tool 2, 22: cylindrical tool body

3, 24: shank 4: drill

5, 11 anti-rotation pin 6: cap nut (fastening member)

7, 29: snap ring 11, 25: fastening member

12: annular member

13, 26: fixed ring-shaped member (C ring)

14: pressure pin 15: ball

16: pressure pin member 22a, 24c: spline groove

24a: Shank large diameter part (first diameter part)

24b: Shank small diameter part (second diameter part)

24d: outer circumferential groove 24e: shank large diameter upper surface

24f: pinhole 25b: cam groove

27: cam pin 28: elastic body

In the cylindrical drilling tool according to the present invention, the cylindrical tool main body 22 having the cylindrical cutting edge 22c is fitted into the cylindrical tool main body 22 so as to be coaxially and integrally rotatable, and the cylindrical tool main body ( 22. In the cylindrical drilling tool formed by fastening the shank 24 and the shank 24 to each other via the fastening member 25, the cylindrical tool main body 22 has a positioning fastening portion 22b, and the shank 24 ) Has at least a first diameter portion 24a and a second diameter portion 24b to be inserted into the cylindrical tool body 22, and has an outer substantially axial orthogonal surface of the first diameter portion 24a (). The cam pin 27 is axially slidably accommodated in the axial hole 24f of 24e, and a ring-shaped member for fixing is provided between the first diameter portion 24a and the cylindrical tool body 22. 26) and the fastening member 25 is fitted to the second diameter portion 24b of the shank 24. An axial protrusion of the cam pin 27 is in contact with a circumferential cam portion 25b provided to extend in the circumferential direction on an inner approximately orthogonal surface of the fastening member, and the fastening member 25 is the shank 24. When the fastening member 25 is rotated relative to the shank by a predetermined angle, the cam pin 27 is added to the first diameter portion 24a of the shank by the elastic member 28 provided between the and the shank. By the cam action of the circumferential cam portion 25b, it moves in the axial direction and presses the fixing ring-shaped member 26 to widen the diameter to the positioning fixing engagement portion 22b of the cylindrical tool body 22. It is characterized in that the mutual fastening fixing of each member (22, 24) is made to engage.

Preferably, the cam pin 27 and the circumferential cam portion 25b are provided in plural in the circumferentially roughly equal positions of the fastening member 25 and the fastening member 25, respectively.

In the circumferential cam portion 25b, preferably, at least one of the positions corresponding to the starting point and the end point of the rotation operation of the fastening member 25 is deeply detented.

In addition, the elastic member 28 is preferably made of urethane rubber or metal coil spring.

Further preferably, the cylindrical tool body 22 and the shank are splined to each other.

Moreover, the other elastic member 30 which presses the cam pin 27 to the said fastening member 25 in the axial hole 24f of the said shank 24 is provided preferably.

5 to 11 show one embodiment of the cylindrical drilling tool of the present invention.

In Fig. 5, the cylindrical drilling tool 21 coaxially holds the shank 24 having the drill 4 as the second cutting edge in the cylindrical tool body 22 having the first cutting edge 22c at approximately the lower end. The cylindrical tool body 22 and the shank 24 are fastened and fixed to each other via the fastening member 25.

The cylindrical tool main body 22 is provided with the inner circumferential spline groove 22a by forging or broaching in the vicinity of the upper end, and the inner circumferential engagement groove 22b is provided.

The shank 24 has a large diameter portion 24a as the first diameter portion below and a small diameter portion 24b as the second diameter portion above the shank 24, as shown in FIG. The outer circumferential spline groove 24c, the outer circumferential groove 24d, and three axial holes 24f provided at the circumferentially equal positions of the large diameter upper surface 24e. In addition, the large diameter portion 24a as the first diameter portion and the small diameter portion 24b as the second diameter portion can set various diameters. Moreover, the large diameter part upper surface 24e may be a axial orthogonal surface of the shank 24, or may not be exactly an axial orthogonal surface, but may be a convex or concave tapered surface.

5, 6 and 8, 26 is housed in the outer peripheral groove 24d of the shank 24 by a metal C ring as a fixing ring-shaped member.

27 is three cam pins, which have a tapered cam portion 27a at the lower end thereof, and are inserted in the three axial holes 24f of the shank 24 so as to be axially slidable, respectively.

The fastening member 25 has a concave portion 25a that accommodates an elastic body 28 to be described later in a ring shape, and has three circumferential cam grooves 25b on its lower surface. As shown in Figs. 10 and 11, the cam groove 25b is provided with a linear gradient in which the groove depth gradually becomes shallow from one end A, B to the other end C, D. A large gradient in which the groove depth changes abruptly from the groove end toward the groove center from the groove portion 25c and the CD portion 25d is provided. That is, each of the portions 25c and 25d forms a detent portion for the cam pin 27 as described later.

In addition, the lower surface on which the circumferential cam groove 25b of the fastening member 25 is provided is not only an axial orthogonal surface, but the taper surface when the large diameter upper surface 24e is a convex or concave tapered surface. It may be a concave or convex tapered surface.

28 is a ring-shaped elastic body made of urethane rubber or the like. In addition, the elastic body 28 is not limited to this, You may use metal coil springs, such as steel.

The axial holes 24f, the cam grooves 25b, and the cam pins 27 are each provided three, but four or more holes may be provided without being limited thereto, and one or two may be provided in some cases. do. In addition, the circumferential cam groove 25b is not limited to the groove, and if the height is changed in the axial direction, various shapes such as protrusions can be taken.

Next, the assembly of the cylindrical drilling tool 21 of the present invention will be described.

First, as shown in FIG. 6 and FIG. 7, the lower large diameter portion 24a in the state where the C ring 26 is accommodated in the outer circumferential groove 24d of the lower large diameter portion 24a of the shank 24. ) Is inserted into the cylindrical tool main body 22 to be integrally rotated by engaging the spline grooves 22a and 24c. At this time, the C ring 26 opposes the inner circumferential engagement groove 22b of the cylindrical tool body 22.

Subsequently, three cam pins 27 are inserted into the axial hole 24f on the upper surface of the large diameter portion 24a. Moreover, the fastening member 25 is fitted to the small diameter part 24b of the shank 24, and the upper end part of the said cam pin 27 is accommodated in three cam grooves 25b, respectively.

Subsequently, the elastic body 28 is accommodated in the recess 25a of the fastening member 25 and stopped by the snap ring 29 so that the fastening member 25 is moved downward by the elastic body 28 in FIG. 5. Pressurize further.

Before use of the device, since the upper end of each cam pin 27 is located corresponding to the point A which is the deepest part of the cam groove 25b (this state is shown in the left part in Figs. 5 and 6), the fastening member 25 is Although it is added downward by the elastic body 28 and abuts on the upper surface 24e of the shank large diameter portion 24a, the lower cam portion 27a of the cam pin 27 only makes light contact with the C ring 26 ( 5 and 6 refer to the left part).

Next, the use of the cylindrical drilling tool 21 of the present invention will be described.

First, the fastening member 25 is rotated by? = Approximately 90 degrees (see Fig. 10) by the clockwise direction as viewed from above in Fig. 5. Then, the upper end part of each cam pin 27 reaches D point via A point and B point C of the fastening member cam groove 25b relatively. In the meantime, each cam pin 27 is pressurized downward by the cam groove 25b, and finally, the lower cam portion 27a is engaged with the inner circumference of the C ring 26 so that the diameter of the C ring 26 can be reduced. It widens and deforms so that it may be engaged with the inner peripheral engagement groove 22b of the cylindrical tool main body 22 (refer the right part in FIG. 5 and FIG. 6). Thus, the cylindrical tool main body 22, the shank 24, and the fastening member 25 are mutually fixed, and are in a fastened state. The cylindrical tool main body 22 and the shank 24 are fixed by spline engagement with respect to mutual rotation direction positions.

Therefore, when the drilling operation is performed in this state, the rotational torque (clockwise) from the shank 24 is directly transmitted to the cylindrical tool body 22 by spline meshing. Therefore, since the cutting torque is not transmitted to the inner circumferential engagement groove 22b of the cam pin 27, the C ring 26, and the cylindrical tool body 22, these members are not damaged.

To release the tightened state, the fastening member 25 is rotated by about 90 degrees counterclockwise as opposed to the above. Then, the upper end of each cam pin 27 is returned from the D point of the fastening member cam groove 25b to the A point, and each cam pin 27 presses and slides upward by the C ring 26 which narrows and returns. 5 and 6, the state returns to the state of the left portion, whereby the fastening state of the cylindrical tool main body 22, the shank 24, and the fastening member 25 is released.

In addition, since the upper end of the cam pin 27 is located at the point A of the cam groove 25b at the time of disengagement and at the point D of the cam groove 25b at the time of tightening, the upper end of the cam pin 27 is located at the positions A and D of these cases. Since it is positioned tentatively, the configuration is stable because it is not accidentally shifted from their position. In addition, when the upper end of the cam pin 27 moves from the B point of the cam groove 25b to the A point at the time of disengagement of the engagement, the cam groove 25b becomes stepped deeply, and thus the lower cam part 27a and the C ring in the state of moving to the A point. The engagement of (26) is released with a margin, and the C ring 26 can be sufficiently narrowed and deformed to completely release the elastic force.

Fig. 12 shows another embodiment of the cylindrical boring tool according to the present invention, in which the same parts as in Fig. 6 are denoted by the same reference numerals and the description thereof will be omitted. In the figure, the coil spring 30 accommodated in the axial hole 24f of the shank large diameter portion 24a is housed in a blind hole 27b provided at the lower end of the cam pin 27, and the coil spring 30 is The cam pin 27 is urged upwards in the figure by the biasing force. In FIG. 12, the cam pin 27 is secured by the force of the coil spring 30 in addition to the pressing force of the C ring 26 returning by narrowing the diameter while the cam pin 27 reaches the downward movement limit in the drawing. It is also possible to stably move back upward.

As can be seen from the above, in the present invention, when the fastening member 25 is rotated relative to the shank 24 by a predetermined angle, the cam pin 27 is driven by the cam action of the circumferential cam portion 25b. It moves in the axial direction and presses the fixing ring-shaped member 26 to widen the diameter so as to be engaged with the positioning fixing engaging portion 22b of the cylindrical tool body 22, and each member 22, 24, 25 Since the above mutual fastening fixing is performed, the following effects are obtained.

(1) Since the fastening member 25 can be rotated within one rotation, for example, about 90 degrees, and mutual fastening can be performed between the members 22, 24, and 25, the fastening and disengaging operations are facilitated.

In addition, since the fastening member 25 is firmly fastened by the cam action of the cam pin 27 and the circumferential cam portion 25b of the fastening member 25, the fastening member is drilled without loosening as in the case of using a cap nut. The work can be performed stably.

(2) When the cam pins 27 and the circumferential cam portions 25b are provided in plural, respectively, the fastening and fixing state is further firmly and stabilized.

(3) Since the cam portion 25b is detented in its axial height at a position corresponding to the rotational start point and the end point of the fastening member 25, the position of the fastening member 25 is clicked to maintain a stable configuration. can do.

④ Since the elastic member 28 for urging the fastening member 25 in the direction of the first diameter portion (large diameter portion) 24a of the shank is urethane rubber, the force of force is greater than that of the coil spring, so that a more stable configuration can be provided. Can be.

⑤ When the elastic member 28 which presses the said fastening member 25 to the direction of the 1st diameter part 24a of a shank is made into the coil spring, a structure can be made cheap.

⑥ Since the cylindrical tool main body 22 and the shank 24 are splined with each other, the pin 5 and the thickness of the prior art have a large rotational torque that can be transmitted from the shank 24 to the cylindrical tool main body 22. In the case of engagement of the cutout portion 2c of the thin cylindrical tool body 2, there is no fear that the parts will be broken as compared to the breakage of the pin 5 or the crack around the cutout portion 2c. Is improved.

By providing the elastic member 30 which adds the cam pin 27 in the axial hole 24f of the shank 24, the return operation | movement of the cam pin 27 is stabilized and a further structure can be stabilized.

Claims (7)

The shank 24 is coaxially and integrally rotatably mounted in the cylindrical tool main body 22 having the cylindrical cutting edge 22c, and the cylindrical tool main body 22 and the shank 24 are mounted. In the cylindrical drilling tool which is fastened to each other via the fastening member 25, The cylindrical tool body 22 has a positioning fastening portion 22b, The shank 24 has at least a first diameter portion 24a and a second diameter portion 24b, which are fitted into the cylindrical tool body 22, and approximately outside of the first diameter portion 24a. The cam pin 27 is slidably accommodated in the axial hole 24f of the axial orthogonal surface 24e, and is fixed between the first diameter portion 24a and the cylindrical tool body 22. The ring-shaped member 26 is stored, When the fastening member 25 is fitted to the second diameter portion 24b of the shank 24, the circumferential cam portion 25b provided so as to extend in the circumferential direction on an approximately axial orthogonal surface inside the fastening member. The axial projection of the cam pin 27 abuts, and the fastening member 25 is biased in the direction of the first diameter portion 24a of the shank by an elastic member 28 disposed between the shank 24. Become, When the fastening member 25 is rotated relative to the shank 24 by a predetermined angle, the cam pin 27 moves in the axial direction by the cam action of the circumferential cam portion 25b to fix the ring-shaped member. Pressurize (26) to widen the diameter so that the cylindrical tool body (22) is engaged with the positioning fixing engaging portion (22b), and the mutual fastening fixing of each member (22, 24) is performed. Cylindrical drilling tools. The method of claim 1, The cam pin (27) and the circumferential cam portion (25b) is a plurality of cylindrical drilling tool, characterized in that a plurality is installed in approximately equal positions in the circumferential direction of the fastening member (25) and the fastening member (25), respectively. The method according to claim 1 or 2, The circumferential cam portion (25b) is a cylindrical drilling tool, characterized in that at least one of each position corresponding to the starting point and the end point of the rotation operation of the fastening member 25 is deeply grooved. The method according to any one of claims 1 to 3, The elastic member 28 is a cylindrical drilling tool, characterized in that made of urethane rubber. The method according to any one of claims 1 to 3, The elastic member 28 is a cylindrical drilling tool, characterized in that made of a metal coil spring. The method according to any one of claims 1 to 5, The cylindrical tool main body (22) and the shank (24) is a cylindrical drilling tool, characterized in that the integral rotation can be made possible by spline meshing with each other. The method according to any one of claims 1 to 6, A cylindrical drilling tool, characterized in that another elastic member (30) is added to the cam pin (27) in the direction of the fastening member (25) in the axial hole (24f) of the shank (24).