WO1993004809A1

WO1993004809A1 - Chuck untightening-tightening device

Info

Publication number: WO1993004809A1
Application number: PCT/JP1992/001136
Authority: WO
Inventors: Nakao Yoshizawa
Original assignee: Kyoritsu Seiki Corporation
Priority date: 1991-09-05
Filing date: 1992-09-04
Publication date: 1993-03-18
Also published as: JPH0524209U; JP2585273Y2

Abstract

A chuck untightening-tightening device which is characterized in that untightening-tightening work is automated to relieve the load imposed on a worker, a tool is stably mounted on a tool holder with the same clamping force to improve the service life of the tool holder, the device has as its object the speed-up of the untightening-tightening work, and a chuck portion fixing means capable of fixing a chuck portion of the tool holder for gripping the tool is provided reciprocatingly movably in the axial direction of a rotatable main shaft for mounting thereon with the tool holder.

Description

Specification

Check loosening device

Technical field

The present invention relates to a chuck loosening device used for attaching and detaching a tool to and from a tool holder used in a machining center and the like. More specifically, the present invention relates to a tool holder for gripping a tool which automatically holds a chuck of the tool holder. It is suitable for a chuck tightening device that tightens loosely.

Background art

Conventionally, in a machining center or the like, a tool holder for holding a tool having a straight shank is generally widely used. To mount the tool on the tool holder, insert the shank of the tool into the chuck part of the tool holder, and the operator hands the nut provided through the collet of the chuck part. The work was tightened with a hook spanner and the tool was mounted on the tool holder.

Also, when removing the tool from the tool holder, the operator had to perform the opposite operation manually. However, in machining centers and the like used today, many types of tools are used, and the number of tools to be mounted on the tool holder and the number of times of mounting are extremely large. The problem that loosening work of the lock section places a heavy burden on the workers engaged in it was there.

In addition, the tightening force varies due to individual differences between workers, and as a result, the tool may come off due to insufficient tightening, or the chuck may become too tight to prevent the tool from coming off. There was a problem that the tool could not be stably mounted on the tool holder, and the service life of the tool holder chuck was shortened. There is a problem that it takes time to loosen the parts because the parts are loosened.

Disclosure of the invention

An object of the present invention is to automate the loosening work and reduce the burden on the worker. .

It is another object of the present invention to stably mount a tool to a tool holder with the same tightening force and improve the life of the tool holder.

It is a further object of the present invention to speed up loosening work and improve work efficiency. In order to achieve the above object, the present invention provides a chuck fixing means capable of fixing a chuck of a tool holder for gripping a tool, and reciprocates along an axial direction of a surface-movable spindle on which the tool holder is mounted. Characterized by being provided movably I have.

Further, the chuck portion fixing means has a pair of mutually revolvable claw members, and the pair of claw members is engaged with an engagement groove formed at the tip of the chuck portion of the tool holder. It is characterized by having an engaging claw that can be engaged.

Further, the pair of claw members are always urged in opposite directions.

Further, the chuck portion fixing means has a pair of claw portions at a forked guide portion of the claw portion main body, and the pair of claw portions are formed on a chuck portion of the tool holder. It is characterized in that it can be engaged with the mating groove.

Further, the pair of claw portions are characterized in that they are engaged with and disengaged from the engagement grooves of the chuck portion by driving means.

Further, the chuck portion fixing means is configured to be urged in a direction away from the main shaft so as to be always in a standby position at a standby position.

As described above, in the invention of the present application, the chuck fixing means is provided so as to be movable along the axial direction of the rotatable main shaft. The chuck fixing means, which fixes the chuck along the chuck, can be moved together with the chuck, and the tool inserted with the tool—the chuck of the holder is automatically loosened without manual intervention You can do it. Therefore, loose The burden on workers engaged in tightening work can be greatly reduced. In addition, the chuck part of the tool holder in which the tool has been inserted can be automatically loosened without manual operation, so that the tool can be stably mounted on the tool holder with the tightening force. It is possible to prevent the tool from falling off and to extend the service life of the tool holder. Furthermore, since the speed-up of the loosening operation by automation can be achieved, the efficiency of the loosening operation can be greatly improved.

Further, an engaging claw provided on a pair of claw members or a pair of claw portions provided on a bifurcated tip guide portion of the claw portion main body is engaged with an engaging groove formed in a chuck portion of the tool holder. As a result, the chuck of the tool holder can be securely fixed.

In addition, since the pair of claw forests are constantly urged in opposite directions, or the pair of claw portions are engaged and disengaged from the engagement grooves of the chuck by the driving means, the tool holder The chuck portion can be easily and firmly fixed.In addition, since the chuck portion fixing means is configured to be urged in a direction away from the main shaft so as to always be able to stand by at the standby position, the operator can The chuck fixing means can always be operated from the same position, and the tool is mounted on the tool holder Work can be done safely.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front sectional view for explaining a chuck portion fixing means of the chuck loosening device according to the present invention. Fig. 2 is a cross-sectional view taken along the line AA in Fig. 1. Fig. 3 is a cross-sectional view showing the main shaft and its driving unit. Fig. 4 is another drawing of the claws of the chuck fixing means. FIG. 4 is a schematic half-sectional view showing an example of FIG.

Best mode for carrying out the invention

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes a tool holder mounted on the spindle 2 of the chuck tightening device of the present invention, 3 denotes a chuck portion of the tool holder 1 having a collet (not shown) for holding a tool, and 5 denotes a chuck portion. An engagement groove formed in the nut 7 for loosely tightening the collect of the chuck portion 3. A chuck portion fixing means 11 for fixing the nut 7 of the chuck portion 3 is provided on a side of the chuck portion 3 of the tool holder 1.

The chuck fixing means 11 engages the engaging claws 13 a and 14 a engaging with the engaging groove 5 of the nut 7 with the tip inward. And a pair of claw members 13 and I4. The heads 13 b and 14 of the pair of claw forests 13 and 14 are fitted into grooves 15 a cut across the holding member 15 for holding the claw members 13 and 14. The pawl members 13 and 14 are inserted so as to be rotatable within a predetermined angle via connecting portions 17a and 17b such as rivets.

Also, the arms 13 c and 14 c of the claw members 13 and 14 are provided with operations 19 a and 19 b for operating the rotation of the claw members 13 and 1 along the direction in which the main shaft 2 extends. Each is provided. Between the operating rods 19a and 19b and the protruding member 21 protruding from the holding member 15, the claw members 13 and 14 are attached inward (in opposite directions). Elastic members 23a and 23b such as coil springs are provided.

The holding member 15 protrudes in parallel from the casing 27 along the axial direction of the main shaft 2 and is slidable along two guide rods 29 supported by a support member 28. Further, it is fixed to the member 31 via a connecting member 25. Therefore, the chuck fixing means 1I is configured to be slidable along the axial direction of the main shaft 2.

One end of the wire 33 is fixed to the side surface 31 a of the sliding member 31 via a fixture 35. this The other end of the wire 33 is connected to the support member 28 via a boogie 37 projecting from a tip 28 a of a support member 28 that supports the tip of the guide rod 29. It is connected to a constant load panel 39 projecting downward from the lateral support portion 28b. Accordingly, the chuck fixing means 11 is constantly urged toward the tip of the guide π 29, and when not engaged with the chuck 3 of the tool holder 1, the guide rod 2 is not engaged. It is always waiting in the direction of the tip of 9.

The main shaft 2 is, as shown in FIG.

7 is supported by bearings via bearings 41a and 41b. The tip end is provided so as to protrude from the casing 27, and a fitting hole 2a for mounting the tool holder 1 is formed in the axial direction of the main shaft. A gear 43 is fixedly provided on the rear end side of the main shaft 2. The gear 43 is a rotary drive shaft that is supported via bearings 45a and 45b.

This is combined with a gear 49 fixed to the tip side of 47. The image drive shaft 47 is provided with a gear 51 at its rear end. The gear 51 is fixedly mounted on a drive shaft 55 of a hydraulic motor 53 operated by hydraulic pressure, pneumatic pressure, etc., which is a driving source of the chuck loosening device mounted on a casing 27. Gear 5 7. Therefore, when the fluid pressure motor 53 operates, its rotation is

57, via rotary drive shaft 47, gear 51, gear 43 It is transmitted to the main shaft.

Further, a sensor detecting piece 59 is provided on a rear end side surface of the gear 43 of the main shaft 2. A sensor 61 for controlling the number of rotations at the time of chuck loosening is provided at a position in the casing 27 facing the sensor detecting piece 59.

Note that 63 a and 63 b in FIG. 2 are male threads that are screwed into female threads formed in the through holes 31 a and 31 b reaching the guide rod 29 from the side surface of the sliding member 31. This is a torsion part having a portion at the front end and used for fixing the sliding member 31 to the guide rod 29. Blocks 65a and 65b are screwed 180 degrees apart from each other on the tip end surface of the spindle 2 and engage with the engagement grooves of the tool holder 1 mounted on the spindle 2. .

Next, the operation of the present invention having the above configuration will be described.

First, in order to mount the tool on the tool holder 1, make sure that the engagement groove of the tool holder 1 and the blocks 65a and 65b of the spindle 2 are engaged, and the shank 1a of the tool holder 1 is Fit the tool holder 1 to the spindle 2 in the fitting hole 2a of 2. Move the chuck fixing means 11 from the standby position at the tip of the guide rod 29 to the side of the chuck 3 of the tool holder 1. Operate by surroundings 1 9 a, 19 b to rotate claw members 13, 14 outward, fix engagement groove 5 of nut 7 of chuck section 3 and chuck section The position of the engaging pawls 13a and 14a of the means 11 is brought together by rotating the spindle 2 by hand. (At this time, the spindle 2 discharges the pressure fluid in the fluid pressure motor 53, A free surface roll is possible). With the operating rods 19 a and 19 b in a free state, the engaging claws 13 a and 14 a are engaged with the engaging grooves 5.

At this time, the claw members 13 and 14 are urged inward by the elastic members 23 a and 23 b, and the engagement claws 13 a and 14 a are firmly held without coming off the engagement groove 5. Is engaged with.

Then, insert the shank of the tool (not shown) into the collet of the chuck part 3 of the tool holder 1 to set the tool height, and turn the spindle 2 by hand to confirm that the tool is temporarily tightened. I do.

Next, release the free of the main shaft 2 (close the discharge port of the fluid pressure circuit) and operate the fluid pressure motor 53, and the gears 57, 51, 49, 43 The main shaft 2 rotates to the left in FIG. The nut 7 fixed to the chuck portion 11 moves to the right in FIG. 1 together with the slidable chuck portion fixing means 11 to collect the chuck 3. Force nut 7 The junk is gripped by the collet. When the chuck portion 3 is tightened to a predetermined torque, the fluid pressure motor 53 is stopped, and the tool is firmly mounted on the tool holder 1.

Then, the main hook 2 is released again, the engaging claws 13a and 14a of the chuck fixing means 11 are removed from the engaging grooves 5 of the nut 7 of the chuck 3, and a series of Tightening work is completed. Since the chuck surface determining means 11 is constantly urged toward the distal end of the guide rod 29 by the constant load spring 39 via the wire 33, the sliding member 31 is guided. It moves to the tip of the lid 29 and waits at the standby position. The tool height setting and the temporary fastening may be performed on another tool presetter, and only the fastening may be performed. The tightening torque is detected by detecting the circuit pressure of the supplied working fluid, and when the surface pressure corresponding to the set torque is reached, the fluid pressure motor 53 is stopped. To remove the tool from 1, mount the tool holder 1 with the tool on the spindle 2 in the same manner as above. Subsequently, the engaging claws 13 a and 14 a are engaged with the engaging grooves 5 as described above.

Next, release the free shaft 2 (free of hydraulic pressure circuit). When the hydraulic motor 53 is actuated, the raw shaft 2 turns to the right in Fig. 2 via gears 57, 51, 49, 43, and the Lock part fixing means 11 Nut 固定 fixed to 1 is slidable chuck part fixing means

Moving to the left in Fig. 1 together with 11, the chuck 3 is loosened.

When the spindle 2 is rotated by a preset number of revolutions, the rotation of the sensor detecting piece 59 is detected by the sensor 61, the fluid pressure motor 53 is stopped, and the spindle 2 is stopped. The tool in the chuck part 3 of the tool holder 1 is loosened.

Then, to completely loosen and remove the tool, make the spindle 2 free again, manually rotate the spindle 2 by an arbitrary amount, further loosen the chuck part 3, and remove the tool. Also at this time, the chuck fixing means 11 is pulled by the constant load spring 39 and stands by at the standby position at the tip of the guide rod 29. Therefore, the operator can always operate the chuck portion fixing means 11 from the same position, and the work of mounting the tool on the tool holder 1 can be performed safely.

The reason why the sensor detecting piece 59 and the sensor 61 are provided is to prevent the tool from being excessively loosened. If the chuck 3 is completely loosened, the tool may drop due to its own weight. No, to prevent it.

In the above embodiment, the fluid pressure motor 53 was used as the drive source of the chuck loosening device. However, instead of the fluid pressure motor 53, an electric torque motor with a reduction gear or variable torque can be set. Any suitable driving device or the like may be used. In this case, in order to prevent the chuck portion 3 from being overtightened, it is preferable to provide a torque limiter on the mounting portion of the gear 51 on the rear end side of the surface rotation drive shaft 47.

In addition, instead of the constant load spring 39 used to always urge the chuck portion fixing means 11 to stand by at the standby position on the distal end side of the guide rod 29, a balanceway is provided via a pulley. May be provided.

Further, the configuration of the claw portion of the chuck portion fixing means 11 described above may be as shown in FIG. That is, the claw body 70 integrally formed of the grip portion 71 and a semicircular (bifurcated) tip guide portion 72 provided at the tip of the grip portion 71 is attached to the holding member 15. Fixed to. A pair of pawls 75 that can be engaged with and disengaged from the engaging groove 5 of the nut 7 are provided at both front ends of the front guide 72, and the pair of pawls 75 are formed on the hydraulic cylinder 73. The nut 7 is fixed to the piston rod 74, and reciprocates to engage and disengage with the engagement groove 5 of the nut 7. Further, the nut 7 of the chuck portion 3 may be fixed by using a structure such as a disk brake. The shape of the engaging claws 13 a and 14 a is such that the engaging claws 13 a and 14 a engage with the engaging groove 5 of the nut 7 of the chuck portion 3 and the chuck portion. There is no particular limitation as long as it can be firmly hooked into the engagement groove 5 at the time of the loosening of 3, and whether it is a square claw shape or a round claw shape.

As described above, according to the present invention, the chuck fixing means is provided so as to be movable along the axial direction of the movable main shaft. It is possible to move the chuck fixing means, which fixes the chuck, along with the chuck along the axial direction of the spindle, and to manually move the chuck of the tool holder into which the tool is inserted. Automatic loosening can be performed without any intervention. As a result, the burden on workers engaged in loosening work can be greatly reduced. In addition, the chuck part of the tool holder in which the tool is inserted can be automatically loosened without manual intervention, so that the tool can be stably mounted on the tool holder with the same tightening force. In addition, the tool can be prevented from falling off, and the life of the tool holder can be prolonged. Furthermore, speedup of the loosening operation by automation can be achieved, and the efficiency of the loosening operation can be greatly improved.

Also, an engagement claw provided on a pair of claw members or a pair of claw portions provided on a bifurcated tip guide portion of the claw body. Engages with the engagement groove formed in the chuck portion of the tool holder, so that the chuck portion of the tool holder can be securely fixed. Also, since the pair of claw members are always urged in opposite directions, or because the pair of claw portions are engaged with the engagement grooves of the chuck portion by the driving means, the chuck portion of the tool holder is formed. The engaging claw (claw portion) does not easily come off from the engaging groove, and the chuck portion can be firmly fixed. In addition, since the chuck fixing means is configured to be urged in a direction away from the main shaft so as to always be able to stand by at the standby position, the operator can always operate the chuck fixing means from the same position. The work of attaching the tool to the tool holder can be performed safely.

Industrial applicability

The chuck loosening device of the present invention having the above-described excellent effects can be extremely effectively used for automatically attaching and detaching a tool to and from a tool holder used for a machining center or the like.

Claims

The scope of the claims

1. The chuck part fixing means that can fix the chuck part of the tool holder that holds the tool is provided so that it can reciprocate along the axial direction of the rotatable main shaft on which the tool holder is mounted. Check loosening device.

2. The chuck fixing means has a pair of claw members which can rotate relative to each other, and the pair of claw members are engaged with engagement grooves formed at the tips of the tool holder at the tips thereof. 2. The chuck loosening device according to claim 1, further comprising an engageable engaging claw.

3. The chuck loosening device according to claim 2, wherein the pair of claw members are always urged in directions facing each other.

The chuck portion fixing means has a pair of claw portions at a forked guide portion of the claw portion main body, and the pair of claw portions are engaged with the engagement portion formed on the chuck portion of the tool holder. 2. The chuck loosening device according to claim 1, wherein the chuck loosening device is configured to be engageable with the groove.

5. The chuck according to claim 4, wherein the pair of claw portions are engaged with and disengaged from the engagement grooves of the chuck portion by driving means.

6. The chuck loosening device according to claim 1, wherein the chuck fixing means is configured to be urged in a direction away from the main shaft so as to be always at a standby position.