JPH10309606A - Tool holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote centering promptly and easily. SOLUTION: This device is consited of a shank section member 1 having a driving frange 2 on a top end, a spherical base axis 3 arranged at the center section of the top end side of the shank section member 1 and formed a convex spherical section 6 concentrically, a tool holding chuck 7 provided at the top end side of the spherical base axis 3, a centering ring member 8 arranged to touch the driving frange 2 and touch externally the latter half side of the convex spherical section 6, a convex spherical section holding ring member 9 arranged to adjoin the center ring member 8 and touch externally the first half side of the convex spherical section 6. Inner peripheries 10, 11 of each ring members 8, 9 are formed taper-like and concave-spherical-like, the driving frange 2 and the centering ring member 8 and the convex spherical section holding ring member 9 are connected with the volts B1, B2 each other so that these and the spherical base axis 3 are integrally communicated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder used by being attached to a main shaft of a machine tool such as a lathe, and more particularly to a tool holder having a centering function.

[0002]

2. Description of the Related Art A tool holder having a centering function of this type is disclosed in Japanese Patent Application Laid-Open No. Hei 7-214405. The tool holder includes a shank member fixed to a main shaft of a lathe, a tool clamp unit for clamping a tool such as a drill, and a slightly concave disk-shaped member disposed between the shank member and the clamp unit. The clamp unit and the disk-shaped member are connected by bolts, and by rotating this disk-shaped member back and forth, the tool clamp unit is centered,
A tool to be attached to the tool clamp unit and a lathe spindle can be arranged on a coaxial line.

[0003]

In the above-mentioned conventional tool holder, the centering is performed by a disc-shaped member having a slightly concave surface. However, the centering operation is troublesome with this disc-shaped member. Was very time consuming.

[0004] It is an object of the present invention to provide a tool holder which is easy to operate and can be centered quickly and easily.

[0005]

A tool holder according to a first aspect of the present invention is mounted on a main shaft of a machine tool and has a shank member 1 having a driving flange 2 at a tip thereof, and a center of the shank member 1 on the tip side. A spherical base shaft 3 having a convex spherical portion 6 formed on an outer peripheral portion thereof, a tool holding chuck 7 provided on a distal end side of the spherical base shaft 3, and a convex spherical shape formed in contact with the drive flange 2. A centering ring member 8 disposed so as to circumscribe the rear half of the portion 6; and a centering ring member 8 disposed adjacent to the centering ring member 8 so as to circumscribe the front half of the convex spherical portion 6. Inner ring surface 9 of each of the ring members 8, 9.
Numerals 0 and 11 are formed in a tapered or concave spherical shape, and the drive flange 2, the centering ring member 8 and the convex spherical portion holding ring member 9 are connected to each other by bolts B1 and B2, thereby forming a spherical base shaft. 3 is integrally connected.

According to a second aspect, in the tool holder according to the first aspect, the spherical base shaft 3 is urged rearward in the axial direction by an elastic member 26 concentrically disposed inside the shank member 1. It is characterized by being.

According to a third aspect of the present invention, in the tool holder according to the first or second aspect, the drive flange 2 and the centering ring member 8 are connected by a bolt B1, and the drive flange 2 and the convex spherical portion are held. It is characterized in that the ring member 9 is connected to the bolt B2.

According to a fourth aspect, in the tool holder according to the first or second aspect, the drive flange 2 and the centering ring member 8 are bolted together, and the centering ring member 8 and the convex spherical portion are held. It is characterized in that it is bolted to the ring member 9 for use.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing the entire tool holder K according to the present invention, reference numeral 1 denotes a straight hollow shank member mounted on a main shaft of a machine tool, for example, a turret lathe. The flange 2 is formed concentrically. Reference numeral 3 denotes a hollow spherical base shaft arranged along the center of the shank member 1 on the front end side.
Are formed in a short axis shape, and a convex spherical portion 6 is formed concentrically on an outer peripheral portion between both end shaft portions 4 and 5,
A tool holding chuck 7 for holding a tool T such as a drill is provided on the front end shaft 4 side.

In FIG. 1, reference numeral 8 denotes a centering ring member which abuts on the front end surface 2a of the drive flange 2 of the shank member 1 so as to be slidable in the radial direction and is provided on the rear half side of the convex spherical portion 6. It is arranged to circumscribe. 9
Is a ring member for holding the convex spherical portion, which is disposed adjacent to the centering ring member 8 so as to circumscribe the front half of the convex spherical portion 6. Inner peripheral surface 10 of centering ring member 8
Is formed so as to be in line with the convex spherical portion 6 of the spherical base shaft 3, and the inner peripheral surface 11 of the convex spherical portion holding ring member 9 is also The taper is formed so as to make line contact. The inner peripheral surfaces 10 and 11 of the ring members 8 and 9 may be formed in a concave spherical shape so as to make surface contact with the convex spherical portion 6 instead of the taper as described above.

As can be seen from FIG. 1, a fitting step portion 12 having an L-shaped cross section is provided around the front end surface of the centering ring member 8, and the fitting step portion 12 holds a convex spherical portion. The rear end protruding portion 9a of the ring member 9 is fitted so as to be slidable in the axial direction. Further, as can be seen from FIG. 2, the drive flange 2, the centering ring member 8 and the convex spherical portion holding ring member 9 are each formed in a substantially triangular shape and arranged so as to overlap each other in the axial direction. .

As can be seen with reference to FIGS. 1 and 2, two screw holes 13 and 14 are provided side by side at each apex of the triangular drive flange 2. At each apex portion of the centering ring member 8 corresponding to one of the screw holes 13, a bolt head immersion recess 15 is provided, and the bottom of the recess 15 is screwed into the screw hole 13. A bolt insertion hole 16 for inserting the bolt B1 to be inserted is provided, and each vertex of the centering ring member 8 is screwed into the other screw hole 14 at a portion adjacent to the bolt insertion hole 16. A bolt insertion hole 17 through which the bolt B2 is inserted is provided. Further, an operation tool insertion hole 18 for inserting a rotary operation tool for rotating the bolt B1 screwed into the screw hole 13 on the drive flange 2 side is provided at each apex portion of the convex spherical portion holding ring member 9, Bolt head immersion recess 1 for bolt B2
9 and bolt insertion holes 20 are provided side by side. The bolt insertion holes 16, 17, and 19 are formed sufficiently larger than the outer diameters of the bolts B1, B2 so that the centering ring member 8 and the convex spherical portion holding ring member 9 can be displaced in the radial direction. . In FIG. 1, a and b indicate engagement recesses for engaging the rotary operation tool provided on the heads of the bolts B1 and B2, respectively.

Therefore, the driving flange 2 of the shank member 1
In order to assemble the centering ring member 8, the convex spherical portion holding ring member 9 and the spherical base shaft 3, the centering ring member 8 is brought into contact with the front end face of the drive flange 2, and the centering ring is mounted. After screwing the bolt B1 into the screw hole 13 of the drive flange 2 from each bolt insertion hole of the member 8, the spherical base shaft 3 is disposed at the center of the tip side of the shank member 1, and the convex spherical portion 6 of the spherical base shaft 3 is The centering ring member 8 is internally fitted, and then the convex spherical portion holding ring member 9 is externally fitted to the convex spherical portion 6, and each bolt is inserted into the convex spherical portion holding ring member 9. From the hole 20, the bolt B2 may be screwed into the screw hole 13 of the drive flange 2 through the bolt insertion hole 17 of the centering ring member 8, whereby the drive flange 2,
The centering ring member 8 and the convex spherical portion holding ring member 9 can be connected to each other, and can be integrally connected to the spherical base shaft 3. In addition, each bolt B1,
By loosening B2, the centering ring member 8 and the convex spherical portion holding ring member 9 can be displaced in the radial direction and the axial direction with respect to the driving flange 2, and the spherical base shaft 3 is centered on the spherical center O. Can be rotated.

As shown in FIG. 1, the tool holding chuck 7 has a tapered inner peripheral surface 21 on the front end shaft portion 4 side of the spherical base shaft 3, and a collet 22 is fitted to the tapered inner peripheral surface 21. And a female thread 25a of a tightening nut 24 rotatably connected to the collet 22 via a nose ring 23.
Is formed on the outer peripheral surface of the front end shaft portion 4 by a male screw portion 26b.
The collet 22 is made of a well-known collet chuck which is screwed into the tool T. The collet 22 is reduced in diameter by rotating the tightening nut 24 and tightening it so as to move to the rear side.
Is held and fixed, and by rotating the tightening nut 24 in the reverse direction, the diameter of the collet 22 is expanded to open the tool T.

As shown in FIG. 1, the spherical base shaft 3 is urged rearward in the axial direction by a tension coil spring 26 which is an elastic member disposed concentrically in the hollow portion 1a of the shank member 1. As a result, the rear half of the convex spherical portion 6 is pressed against the tapered inner peripheral surface 10 of the centering ring member 8. In mounting the tension coil spring 26, a female screw 27 is formed in the hollow portion 1a, a screw shaft 28 is screwed into the female screw 27, and the coil spring 26 is fitted to a pin 29 provided on the screw shaft 28. It is sufficient to lock one end and lock the other end to a locking member 30 provided in the rear end shaft portion 5 of the spherical base shaft 3. And by rotating the screw shaft 28, the spring pressure of the coil spring 26 can be adjusted.

Next, the usage of the tool holder K of the present invention having the above-described configuration will be described with reference to FIGS. 1 and 4A to 4D.

First, as shown in FIG. 4A, a tool holder K is mounted on a lathe turret M, and a test rod 31 for centering is mounted on the tool holding chuck 7 of the tool holder K. At this time, each bolt B1, B of the tool holder K
2, the centering ring member 8 and the convex spherical portion holding ring member 9 can be displaced in the radial direction and the axial direction with respect to the drive flange 2, and the spherical base shaft 3 is made rotatable.

Then, as shown on the right side of FIG.
The test work 32 is attached to the lathe chuck N, and the test work 32 is precisely cut with a cutting tool 33 so as to have the same diameter as the test rod 31, and a test bush 34 is fitted into the test work 32.

Next, the lathe turret M is moved from the state shown in FIG.
While approaching the test bush 34 fitted in the test work 32 and rotating the test bush 34 on the test work 32 by hand, the approaching test rod 31
Into a state as shown in FIG.

If the test bush 34 has been fitted into the test rod 31 to about 1/4 of its length as described above, then the lathe turret M is moved along the Z axis, and 31 is inserted into the test bush 34 to about half of its length to obtain the state shown in FIG.

By the fitting operation of the test rod 31 into the test bush 34 as described above, the spherical base shaft 3 rotates around the spherical center O so as to be concentric with the lathe turret M, and the spherical base shaft 3 rotates. With the movement, the centering ring member 8 is displaced in the radial direction through the gaps between the bolts B1, B2 and the bolt insertion holes 16, 17, and the convex spherical portion holding ring member 9 is moved in the axial direction. Change. If the test bush 34 can be moved back and forth by hand in the state shown in FIG. 4D by hand and the test bush 34 can be moved lightly, the center axis of the spherical base shaft 3 and the lathe The center axis of the turret M coincides with the center axis, and the centering is achieved. Therefore,
In this state, the bolts B1 and B2 are strongly tightened,
The drive flange 2, the centering ring member 8, and the convex spherical portion holding ring member 9 are integrally connected to each other,
What is necessary is just to connect these and the spherical base shaft 3 integrally.

After the centering is completed as described above, the drive flange 2, the centering ring member 8, the convex spherical portion holding ring member 9 and the spherical base shaft 3 are integrally connected to each other, and then attached to the lathe turret M. When the test rod 31 is removed from the tool holding chuck 7 of the tool holder K and a tool T such as a drill to be used is attached to the chuck 7, the center axis of the tool T coincides with the center axis of the lathe turret M. Will match.

According to the above-described tool holder K, the spherical base shaft 3 which is arranged at the center of the tip end side of the shank member 1 and has the convex spherical portion 6 formed concentrically on the outer peripheral portion, and the shank member 1
A centering ring member 8 which is arranged to abut on the front end surface 2a of the drive flange 2 and circumscribe the rear half of the convex spherical portion 6; A ring member 9 for holding the convex spherical portion, which is disposed so as to circumscribe the front half of the convex spherical portion 6, wherein the inner peripheral surfaces of the ring members 8, 9 are tapered, and the driving flange is formed. 2, the centering ring member 8 and the convex spherical portion holding ring member 9 are connected to each other by bolts B1 and B2, whereby the spherical base shaft 3 and the spherical base shaft 3 are integrally connected. When centering, use bolt B
If 1, B2 is loosened, the centering operation is performed only by rotating the spherical base shaft 3, so that the centering operation can be performed very easily and quickly and easily.

Further, since the spherical base shaft 3 is pulled rearward in the axial direction by the compression coil spring 26 arranged concentrically inside the shank member 1, the centering operation is performed by loosening the bolts B1 and B2. In addition, the centering ring member 8 can be displaced only in the radial direction while being pressed against the front end face 2a of the drive flange 2 by the convex spherical portion 6 of the spherical base shaft 3, so that centering can be performed more quickly. Can be.

In the tool holder K, the drive flange 2 of the shank member 1 and the centering ring member 8
The drive flange 2 and the centering ring member 8 are connected to each other by bolts B1, and the drive flange 2 and the convex spherical portion holding ring member 9 are bolted to each other. Are connected by the bolts B2, the three members can be securely and firmly connected by bolts, the number of bolts can be reduced, and the tightening and loosening operations of the bolts can be simplified.

Further, the driving flange 2 of the shank member 1, the centering ring member 8, and the ring member 9 for holding the convex spherical portion are provided.
Although not shown, the drive flange 2 and the centering ring member 8 are bolted to each other, and the centering ring member 8 and the convex spherical portion holding ring member 9 are connected.
May be bolted together.

[0027]

According to the tool holder of the first aspect of the present invention, a spherical base shaft which is arranged at the center of the tip side of the shank member and has a convex spherical portion formed concentrically on the outer periphery, A centering ring member which is disposed so as to be in contact with the driving flange and circumscribes the rear half of the convex spherical portion; and a front half of the convex spherical portion adjacent to the centering ring member. A ring member for holding a convex spherical portion arranged so as to be circumscribed, each ring member having an inner peripheral surface formed into a tapered or concave spherical shape, and a driving flange, a centering ring member and a ring member for holding a convex spherical portion. And the spherical base shaft are integrally connected by bolting the ring member to each other, so that when the centering is performed, if the bolts B are loosened, the spherical base shaft rotates. Just centering movement Performed, therefore the operation can be carried out easily and quickly easily centering.

According to the second aspect of the present invention, since the spherical base shaft is urged rearward in the axial direction by the compression coil spring arranged concentrically inside the shank member, each bolt is loosened and centered. When performing the operation, the centering ring member can be displaced only in the radial direction while being pressed against the front end surface of the drive flange by the convex spherical portion of the spherical base shaft,
Therefore, centering can be performed more quickly.

According to the third aspect, when the driving flange of the shank member, the centering ring member, and the ring member for holding the convex spherical portion are bolted to each other, the driving flange and the centering ring member are bolted to each other. Since the driving flange and the ring member for retaining the convex spherical portion are connected by bolts, the number of bolts can be reduced while the three members can be securely and firmly connected by bolts. As a result, bolt tightening and loosening operations are simplified. Further, although the drive flange of the shank member, the centering ring member and the ring member for holding the convex spherical portion are bolted to each other, the drive flange and the centering ring are omitted from the drawings. The member and the ring member for centering and the ring member for holding the convex spherical portion may be bolted to each other.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a tool holder according to the present invention.

FIG. 2 is a right side view of the tool holder shown in FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIGS. 4A to 4D are explanatory views showing a centering method using the tool holder according to the present invention.

[Explanation of symbols]

Reference Signs List 1 shank member 2 drive flange 3 spherical base shaft 4 front end of spherical base shaft 5 rear end of spherical base shaft 7 tool holding chuck 8 centering ring member 9 convex spherical portion holding ring member 10 taper of centering ring member Inner peripheral surface 11 Tapered inner peripheral surface of ring member for holding convex spherical portion 26 Elastic member B1 Bolt B2 Bolt T Tool

Claims (4)

[Claims] 1. A shank member mounted on a main shaft of a machine tool and having a driving flange portion at a tip thereof; a spherical base shaft disposed at a center portion on a tip side of the shank member and having a convex spherical portion formed on an outer peripheral portion; A tool holding chuck provided on the distal end side of the spherical base shaft, a centering ring member arranged to be in contact with the drive flange portion and circumscribed on the rear half side of the convex spherical portion; A ring member for holding a convex spherical portion arranged adjacent to a ring member so as to circumscribe the front half of the convex spherical portion, and an inner peripheral surface of each ring member has a tapered or concave spherical shape. A tool holder characterized in that the driving flange portion, the centering ring member, and the convex spherical portion holding ring member are bolted to each other, and the spherical flange and the spherical base shaft are integrally connected. 2. The tool holder according to claim 1, wherein the spherical base shaft is urged rearward in the axial direction by an elastic member disposed concentrically inside the shank member. 3. The drive flange portion and the centering ring member are bolted together, and the drive flange portion and the convex spherical portion holding ring member are bolted together. 3. The tool holder according to 1 or 2. 4. The apparatus according to claim 1, wherein the drive flange portion and the centering ring member are bolted together, and the centering ring member and the convex spherical portion holding ring member are bolted together. Item 3. The tool holder according to item 1 or 2.