JPS6254614B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stub holder for attaching and detaching a rotary tool such as a drill to a rotating main shaft of a machine tool.

This type of stub holder is inserted into the shaft hole of the rotating spindle of a machine tool and is fixed in such a way that torque is transmitted from the rotating spindle to the stub holder, and is easily attached to and removed from the rotating spindle. Various stub holders have been proposed so that the process can be carried out quickly. As one of the typical stub holders, for example, as shown in Japanese Patent Publication No. 57-54246, by rotating the holder body inserted to a specified depth into the shaft hole of the rotating main shaft, the inner end of the holder body is A stub holder is known in which a locked portion is configured to lock into engagement with a locking portion provided within the rotating main shaft in a manner that prevents the locking portion from coming off. According to such an easy-to-attach and detach-type stub holder, the holder body can be attached and detached from the rotating spindle very easily and quickly, but the locking portion (for example, an L-shaped locking groove) on the rotating spindle side and the locked part on the holder body side (for example, an L-shaped protrusion)
Since it is impossible to configure the holder body to engage with each other without any gap in the axial direction, it is inevitable that play in the axial direction will occur in the holder body when the two are engaged. Such axial play of the holder body, especially if it allows the holder body to move backward from the mounting position toward the rotating spindle, reduces machining accuracy even if the amount of play is small. This is a major cause of this.

In view of the above-mentioned problems, the present invention is a stub holder that is easy to attach and detach, but completely prevents the attached holder body from moving backward in a direction that adversely affects machining accuracy, that is, toward the rotating spindle. The present invention proposes a stub holder that can prevent this from occurring.

Hereinafter, preferred embodiments of the present invention will be described based on the attached illustrative figures.

In Figures 1 and 2, reference numeral 1 denotes a rotating main shaft on the machine tool side, and its tip face 1a is open, and a shaft hole 2 is concentrically drilled toward the depth side in the axial direction. has. Reference numeral 3 denotes a stub holder of the present invention, which includes a holder main body retainer 4 which is installed inside the rotary main shaft hole 2 on the depth side thereof, and a holder main body retainer 4 which is installed adjacent to the tip end side of the holder main body retainer 4 and which is installed at the tip end. The holder body 6 has a chuck 5 for attaching a tool. The holder body retainer 4 is the second
As shown in the figure, it consists of a retainer body 8 having a holder body locking part 7 on the circumferential portion adjacent to the holder body 6, and a fixing means 9.
As shown in FIG.
and a bolt 13 for compressing and expanding the diameter of the disc spring 10 between the two. The outer diameters of the stopper main body 8, the receiving plate 11, the presser plate 12, and the disc spring 10 in the initial state are configured to be slightly smaller than the inner diameter of the rotating main shaft shaft hole 2, and the receiving plate 11 A cylindrical shaft portion 1 passing through the center of the stopper body 8
1a, and the bolt 13 is provided with this cylindrical shaft portion 11a.
, and its tip is connected to the screw hole 12 of the presser plate 12.
It is screwed into a. 14 is a washer interposed between the head 13a of the bolt 13 and the cylindrical shaft portion 8a, and this washer 14 and the retainer main body 8
A disc spring 15 is interposed between the retainer body 8 and the inner wall surface of the retainer body 8 to press the retainer body 8 toward the receiving board 11 side. Reference numeral 16 denotes a key that is removably fitted into a key fitting recess 17 (FIG. 3) provided in the retainer main body 8, and is formed along the inner circumferential surface of the rotating main shaft hole 2 in the axial direction. It fits into the keyway 18 that is provided. Reference numeral 19 denotes a C-shaped pin which is removably fitted into a pin hole 20 provided on the outer circumferential surface of the presser plate 12, and whose tip protrusion is loosely fitted into the keyway 18 of the rotating main shaft hole 2. The holder body locking portion 7 formed on the front end circumference of the retainer body 8 is constituted by L-shaped notch grooves formed at two mutually opposing locations on the cylindrical surrounding wall 8a.

As shown in FIGS. 1, 2, and 4, the holder body 6 has the holder body locking portion 7.
A locked part 21 that engages with the locking part 21 is provided on the peripheral part of the side adjacent to the retainer 4, and
The portion between the flange portion 22 that comes into contact with the flange portion 22 and the locked portion 21 is configured to have a diameter that allows the portion to be inserted into the rotating main shaft hole 2 without large play. 23
is a rotation-preventing locking piece that can be fitted into the end of the keyway 18 opening in the tip surface 1a of the rotating main shaft 1, and the position of the axial notch 22a provided in the flange 22 Holder body 6
It fits into a key groove 24 formed on the outer circumferential surface of the shaft so that it can move within a certain range in the axial direction. Reference numeral 25 denotes a ring for operating the rotation prevention locking piece 23, which loosely fits into the flange portion 22, is coupled to the rotation prevention locking piece 23 by a fixing screw 26, and is attached to the inner peripheral flange portion 25a. is biased in the axial direction by a compression coil spring 28 interposed between the spring receiving washer 27 and the spring receiving washer 27 so as to abut against the flange portion 22 . Note that the locked portion 21 is connected to the holder main body 6.
An L protruding from two positions facing each other in the circumferential direction of the end of the
The distal end of the locked part 21 is made up of a shaped protrusion, and is fitted in the locking part 7 of the holder body retainer 4 in the axial direction and rotated around the axis in the set direction. The bent portion and the rear end of the L-shaped notch groove of the locking portion 7 engage with each other in a manner that prevents them from coming off in the axial direction.

29 is a tool stopper;
5 and 5, there is provided a stopper body 31 with an outer diameter that allows the tool stopper interior hole 30 provided concentrically in the main center of the holder body 6 to be inserted into the tool stopper interior hole 30 without large play, and this stopper body 3.
1, and an adjustment bolt 33 screwed into a central screw hole 32 (FIG. 1) opened at the inner end of the tool stopper. , is inserted into the internal hole 30 of the tool stopper. A tool holding slit 34 is provided at the front end of the stopper body 31.
is formed, and a key groove 3 is formed on the outer peripheral surface parallel to the axial direction.
5 is provided. 36 is a screw for fixing the tool stopper, which is inserted into the screw hole 3 of the holder main body 6.
7 (FIG. 4), and the inner end fits into the keyway 35 of the stopper main body 31. Note that the bottom 30a of the tool stopper internal hole 30 has
A through hole 38 is provided which can be used to operate the bolt 13 of the holder body retainer 4.

The tool mounting chuck 5 is of a conventional type, consisting of a rubber collet 39 and a tightening nut 40.

Stub holder 3 configured as above
can be used in the following manner for a rotating main shaft 1 provided with a keyway 18 as shown in FIG. That is, before inserting the key 16 into the shaft hole 2,
is fitted into the key fitting recess 17 of the stopper main body 8, and the pin 19 is inserted into the pin hole 20 of the holding plate 12.
(Fig. 3), the holder body locking part 7 and the locked part 21 of the holder body 6 are engaged with each other as described above, and then Assemble the stub holder 3 with the tool mounting chuck 5 and tool stopper 29 removed, and in this state, next attach the pin 1.
9 and the key 16 are inserted into the shaft hole 2 of the rotating main shaft 1 in a state that they fit into the key groove 18. The flange portion 22 of the holder body 6 is connected to the end surface 1a of the rotating main shaft 1.
and the rotation stopper locking piece 23 is fitted into the end of the keyway 18 that opens on the tip surface 1a of the rotating spindle, and the tool stopper internal hole 30 of the holder main body 6 and its bottom through hole 38 are connected. Insert a bolt operation tool such as a hexagonal wrench or screwdriver with a shaft foot of the required length into the holder main body stopper 4, and insert the tool into the square hole etc. provided in the head 13a of the bolt 13. In the fitted state, the bolt 13 is rotated in the tightening direction using the tool.

By tightening the bolt 13, the holding plate 12 of the holder body retainer 4 is drawn toward the receiving plate 11, and the disc spring 10 compressed between the two is deformed and expanded in diameter. Therefore, the outer circumferential edge of the disk spring 10 presses into the inner circumferential surface of the rotary main shaft hole 2 so that the holder main body retainer 4 is fixed in the shaft hole 2 of the rotary main shaft 1.

In addition, when fixing this holder body retainer 4, use a bolt operation tool to press the bolt 13 toward the depth side of the rotary main shaft shaft hole 2, and pull it in the direction to pull out the holder body 6 protruding from the shaft hole 2. By doing so, the retainer body 8 and the receiving plate 11 which are connected to the holder body 6 are connected to the disk spring 1.
5 and can be spaced slightly apart from each other.
In this state, the flange portion 22 of the holder body 6 is brought into contact with the tip end surface 1a of the rotating main shaft 1, and the bolt 13 is tightened as described above to deform and expand the diameter of the disc spring 10, and the holder body retainer 4 is fixed. For example, by creating a slight gap between the stopper main body 8 and the receiving plate 11, the restoring force of the disc spring 15 transmitted from the stopper main body 8 to the holder main body 6 pushes the holder main body 6 into the shaft hole 2. The flange portion 22 is pulled in the insertion direction (depth side) to the rotating main shaft end surface 1a.
It can be pressed into contact with the

Once the holder main body retainer 4 is fixed at a predetermined position in the rotating main shaft hole 2 as described above, the rotation stopper locking piece 23 is moved backward together with the operation ring 25 against the spring 28, and the rotation stopper 4 is moved backwardly against the spring 28. With the locking piece 23 removed from the end of the keyway 18, use the operation ring 25 to remove the holder main body 6, and the inner end locked portion 21 of the holder body 6 is removed from the locking portion 7 on the retainer 4 side. By rotating the holder main body 6 in the reset direction, only the holder main body 6 can be removed from the rotating main shaft hole 2. By separating the holder main body 6 from the stopper 4 and pulling it out in this way, the stopper main body 8 moves toward the depth side in the axial direction by the restoring force of the disc spring 15 and comes into contact with the receiving plate 11.

Holder body 6 pulled out from rotating spindle shaft hole 2
Insert the tool stopper 2 into the inner hole 30 of the tool stopper.
9 and screw hole 37 (fourth
A fixing screw 36 is screwed into the hole shown in FIG. Next, the tool mounting chuck 5 is attached, and a predetermined tool 41 is inserted from the chuck 5 into the holder body 6 as shown by the imaginary line in FIG. Match.
At this time, the bolt 33 of the tool stopper 29 is inserted into the through hole 38 of the tool stopper internal hole bottom 30a so that the amount of protrusion of the tool 41 is a predetermined dimension. The stopper main body 31, which is prevented from rotating by the engagement between the inner end of the fixing screw 36 and the keyway 35, is moved in and out of the bolt 33 by rotating it using a hexagonal hole etc. provided in the head 33a of the bolt 33. I can do it. When the amount of protrusion of the tool 41 has been adjusted, the fixing screw 36 is further tightened to fix the stopper body 31 to the holder body 6, and the tightening nut 40 of the chuck 5 is tightened to attach the tool 41 to the holder body 6. Fixed to.

Once the tool 41 is set in the holder body 6 as described above, the holder body 6 is placed in the shaft hole 2 of the rotating main shaft 1, and the locking part 21 is fixed in the shaft hole 2 using a retainer. Insert it so that it fits into the locking part 7 of 4. At this time, the rotation preventing locking piece 23 is in a position shifted in the circumferential direction with respect to the open end of the keyway 18, and the spring 2 is held together with the operating ring 25.
8 and is in contact with the rotating main shaft end surface 1a in a retracted state. Next, the holder main body 6 is rotated using the operating ring 25 in the set direction in which the locked part 21 engages with the locking part 7 of the retainer 4, but as described above, the retainer main body 8 is Due to the restoring force of the disk spring 15, it moves toward the axial depth (to the left in the figure) and comes into contact with the receiving plate 11, and as shown in FIG. The locking part 7 on the side of the retainer 4 is slightly shifted to the depth side. Therefore, by rotating the holder main body 6 in the direction of the arrow, that is, in the setting direction from this state, the locked portion 21 can be rotated.
However, the locked portion 21 and the locking portion 7 on the retainer 4 side
Chamfered corner portions 21a and 7a formed in
(only one side may be chamfered), the retainer main body 8 is pivoted against the pressing force of the disc spring 15 as shown by imaginary lines in FIGS. 6 and 7, respectively. It will fit into the locking part 7 in a state where it is pulled out in the outward direction (in the direction indicated by the arrow). In this way, the locked part 21 of the holder main body 6 and the retainer 4
By completely engaging with the locking portion 7, the rotation stopper locking piece 23 comes to oppose the end of the keyway 18, thereby moving forward by the restoring force of the spring 28. The rotation preventing locking piece 23 automatically fits into the end of the keyway 18 and locks the holder main body 6.

The tool 41 attached to the rotating main shaft 1 via the stud holder 3 as described above is driven in a predetermined direction by the rotation of the rotating main shaft 1. The holder body 6 rotates in the reset direction. The rotational force of the rotating main shaft 1 is as follows: rotating main shaft 1→key 16→
Stopper body 8 → locking part 7 → locked part 21 → holder body 6 → chuck 5 → torque transmission system leading to tool 41, rotation main shaft 1 → rotation stopper locking piece 23
The torque is transmitted to the tool 41 via a torque transmission system that extends from → holder body 6 → chuck 5 → tool 41.
The rotational force is also transmitted from the holder body 6 to the tool 41 via a torque transmission system from the holder body 6 to the tool stopper fixing screw 36 to the stopper body 31 to the slit 34 to the tool 41.

As mentioned above, a predetermined process is performed using the tool 41 which receives the rotational force from the rotating main shaft 1 and rotates together with the rotating main shaft 1. At this time, the holder main body 6 15 in the axial direction, and the flange portion 22 is pulled toward the axial depth side by the rotation main shaft 1 even in a no-load state.
Since the tool 41 is in pressure contact with the holder main body 6, the tool 41 will not move backward even by a small amount due to the axial reaction force acting on the tool 41 at the start of machining.

In addition, as a means for fixing the holder main body retainer 4 to the rotating main shaft 1, a disc spring 1 whose diameter is deformed and expanded is used.
Although the fixing means 9 using 0 is illustrated as an example, the fixing means is not limited to such a fixing means that presses against the inner circumferential surface of the rotary main shaft shaft hole 2 to obtain a fixing effect. For example, it is also possible to fix the receiving plate 11 directly to the bottom of the shaft hole 2 with the bolt 13. In other words, if the stopper main body 8 is mounted so as to be movable within a certain range in the axial direction within the rotating main shaft shaft hole 2. good. In this case, it is desirable that the stopper main body 8 be non-rotatably mounted in the shaft hole 2.

Furthermore, as an example of a means for preventing rotation of the holder main body 6, a means using a rotation preventing locking piece 23 that fits into the end of the key groove 18 on the rotating main shaft 1 side has been exemplified, but the present invention is not limited to such a configuration. Even if the above-mentioned rotation stopper locking piece is used, if the rotating main shaft does not have the keyway 18, an engaged portion to be engaged by the rotation stopper locking piece 23 should be provided on the tip surface of the rotating main shaft. I can do it.

Furthermore, although the disk spring 15 is used as a spring for biasing the retainer body 8 in the axial direction, other suitable springs such as a coil spring may be used.

The stub holder of the present invention can be implemented as described above, and is located in a shaft hole provided in the rotating main shaft from its tip face toward the axial depth side, and is fixed internally on the axial depth side. a holder body slip-off stopper that is attached to the holder body, and a holder body that is internally disposed adjacent to the distal end side of the holder body and has a tool attachment chuck on the distal end thereof, and the holder main body slip-off stopper is installed on the side adjacent to the holder main body. A retainer body is provided with a holder body locking part on the periphery and is movable in the axial direction within a certain range, and a spring (in the embodiment, a disc spring 15) biases the retainer body in the axial direction. ), and when the holder main body is rotated with the insertion depth regulating stepped portion (flange portion 22 in the embodiment) provided on the holder main body in contact with the distal end surface of the rotating main shaft, the A locked portion that engages with the holder body locking portion in a manner to prevent it from coming off while the retainer body is pulled out against the spring, and the locked portion and the locking portion are completely engaged. In this state, a rotation prevention means (in the embodiment, a rotation prevention locking piece 23) that can engage with a key groove 18 provided in the axial direction of the inner circumferential surface of the rotation main shaft or a locking groove provided on the front end surface of the rotation main shaft. , keyway 24,
Since the device is equipped with an operating ring 25, a fixing screw 26, and a spring 28, the following effects can be obtained.

That is, by inserting the holder body into the rotating spindle shaft hole to a regulated depth, rotating it in a predetermined direction, and then stopping the rotation of the holder body with the rotation preventing means, the holder body is fixed to the rotating spindle shaft. It can be fixed in place in the hole,
Since the holder body can be removed by performing the reverse operation, it can be used as a stub holder that is easy to attach and detach. Moreover, when the holder main body is attached as described above, the holder main body is drawn inward by the biasing force of the spring that biases the retainer main body, and the holder main body is pulled inward by the urging force of the spring that biases the retainer main body, and the holder main body is pulled inward by the biasing force of the spring that biases the retainer main body, and the holder main body is pulled into the insertion depth regulating step. The holder body is in pressure contact with the end face of the rotating main shaft, and there is no gap that would allow the holder body to move backward even under no load.
Therefore, when the locking part on the retainer side (locking part 7 in the example) and the locked part on the holder body side (locked part 21 in the example) are engaged with each other, Even if there is a gap between the two that allows axial wobbling, there is no possibility that the tool attached to the stub holder will move backwards even by a small amount along with the holder body due to the axial reaction force received during machining.

In other words, even if the processing accuracy of the locking part on the retainer side and the locked part on the holder body side or the accuracy of the mounting position of the retainer is somewhat poor, the variation in accuracy can be compensated for by the spring of the retainer body. The holder body, which is always attached, can be completely prevented from moving in the backward direction from the specified mounting position, which has a negative effect on the machining accuracy of the tool, even if it is only a small amount. It can be prevented. Therefore, it has become possible to perform highly accurate machining operations using a tool whose protrusion amount from the holder body is accurately measured in advance.

[Brief explanation of the drawing]

Figure 1 is a longitudinal side view in use, Figure 2 is a plan view showing the holder body, holder body retainer, and tool stopper, Figure 3 is an exploded perspective view of the holder body retainer, and Figure 4 Figure 5 is an exploded perspective view of the main part of the holder body, Figure 5 is an exploded perspective view of the tool stopper, and Figure 6 shows the state before the locking part on the rotating main shaft side and the locked part on the holder body side are engaged. The developed view shown in FIG. 7 is a longitudinal sectional side view in the same state. DESCRIPTION OF SYMBOLS 1...Rotating main shaft, 2...Shaft hole, 3...Stub holder of the present invention, 4...Holder main body retainer, 5...Tool mounting chuck, 6...Holder main body, 7...Holder main body member Stop part, 8... Stopper main body, 9... Fixing means, 10, 15... Belleville spring, 12... Holder plate, 16... Key, 18, 2
4, 35...key groove, 21...locked part, 22...
...Flange portion, 23... Rotating locking piece, 25...
...Operating ring, 26, 36...Fixing screw, 28
... Compression coil spring, 29 ... Tool stopper, 30 ... Tool stopper interior hole, 31 ...
Stopper body, 33... Bolt for adjusting tool protrusion amount, 34... Slit for tool holding, 39... Rubber collet, 40... Tightening nut, 41...
…tool.

Claims (1)

[Claims] 1. A holder body retainer which is internally fixed on the axial depth side in a shaft hole provided in the rotating main shaft from its tip face toward the axial depth side, and a holder body retainer which is located adjacent to the tip side from this. The holder body is provided with a holder body having a chuck for attaching a tool at the tip thereof, and the holder body retainer has a holder body locking part on the side adjacent to the holder body, and the holder body retainer has a holder body locking part on the side adjacent to the holder body, and the holder body retainer has a holder body locking part on the side adjacent to the holder body, and the holder body retainer has a holder body locking part on the side adjacent to the holder body, and the holder body retainer has a holder body locking part on the side adjacent to the holder body, The holder body is provided with a retainer body that is movable in the axial direction, and a spring that urges the retainer body in the axial direction, and the holder body is configured to move an insertion depth regulating step provided on the holder body toward the rotational main shaft. a locked portion that engages with the holder body locking portion to prevent it from coming off while the retainer body is pulled out against the spring when rotated while in contact with the distal end surface of the holder body; When the locked portion and the locking portion are completely engaged, the locking portion is engaged with a key groove provided in the axial direction of the inner circumferential surface of the rotating main shaft or with a locking groove provided on the distal end surface of the rotating main shaft. A stub holder equipped with a rotation preventing means that can be fitted together.