JPH08150504A - Collect drawing device for tool holder - Google Patents

Abstract

PURPOSE: To provide a collet drawing device for a tool holder, capable of easily drawing a taper collet fitted and fastened to a holder main body together with a tool held to it. CONSTITUTION: A head presser tool 20 is attachably/detachably held by being screw-fitted to the terminal part of a holder main body 2, and the tip part 21a of an operating rod 21 inserted through an insertion hole 20d formed on the presser tool 20 from the outside is engaged with an engaging recessed part 17d provided on the head part of a drawing bolt 17. The drawing bolt 17 is rotated in the loosening direction by the operating rod 21 in a state where its head part is in contact with the working surface 20e of the presser tool 20, and a collet 16 whose the terminal part 16b is screw-fitted to the drawing bolt 17 is pushed out to the tip side of a taper hole 11, so as to release fastening of the collet 16 to a tool 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collet removing device for a tool holder that pushes a taper collet together with a tool held by the tool holder holder body when a tool fitted and held by the taper collet of the tool holder is replaced. Is.

[0002]

2. Description of the Related Art A head portion of a draw bolt is supported by a bolt support portion provided in a holder body, and a leg portion extending toward the tip end side of the head portion is fitted into a taper hole formed at the tip end portion of the holder body. Fit the shank of the tool to the end of the collet, fit the shank of the tool to this collet, and rotate the draw bolt in the tightening direction to draw the collet toward the end of the holder body. There has been proposed a tool holder that holds and fixes a shank of a tool fitted to a collet as well as diametrically holding and fixing the shank.

When the tool holder is used to perform processing such as cutting with a tool, the blade of the tool is worn or chipped, and the tool needs to be replaced. To replace the tool, rotate the pull bolt in the direction opposite to the pull-in direction described above to loosen the taper collet and expand its diameter, while pulling out the shank of the tool together with the collet from the tip side of the holder body. A usable tool such as a new tool is held and fixed to the holder main body together with the collet through the collet by the above-described operation.

[0004]

However, in the above-mentioned tool holder, when the tool is replaced, the taper collet is loosened, but the outer peripheral surface of the taper portion of the collet is strongly tightened to the peripheral surface of the taper hole of the holder body. To be
It requires a large force to rotate the draw bolt, and it is difficult to rotate the draw bolt in the loosening direction.In addition, when the draw bolt is slightly loose, the draw bolt and the taper collet are integrated into the holder body. There was a problem of spinning.

The present invention solves the above-mentioned problems,
When replacing the tool, rotate the pull bolt in the loosening direction while holding the head of the pull bolt with the head restraint, and push the taper collet toward the tip of the holder body so that the tool can be easily pulled out. It is an object of the present invention to provide a collet removing device for a tool holder, which allows easy exchange of tools.

[0006]

According to a first aspect of the present invention, a head portion of a pull bolt is supported on a terminal side of a bolt support portion formed on a holder body, and a leg portion extending to a tip side of the pull bolt is provided. A collet removing device for a tool holder for thread-fitting the end of a taper collet fitted in a taper hole at the tip of the holder body, pulling the collet and the tool fitted in the collet to the end side of the holder body, and holding and fixing the tool. ,
A head restraint that removably attaches to the end of the holder body while restraining the movement in the axial direction, and an operation to rotate the pull bolt by engaging the tip with an engaging recess provided on the head of the pull bolt. A rod, the head restraint is provided with a contact surface for contacting the head end surface of the pulling bolt, and an insertion hole for inserting the tip of the operation rod is axially formed. is there.

According to a second aspect of the present invention, in the collet removing device for a tool holder according to the first aspect, the head restraint has an operating portion located outside the distal end of the holder body and a contact surface provided at the tip inside the holder body. A columnar portion that abuts the head of the pulling bolt supported by the bolt supporting portion located at the end of the bolt is integrally formed into a bolt shape, and an insertion hole that penetrates the operation portion and the cylindrical portion in series is formed. However, an external thread portion, which is formed on the inner circumference of the end portion of the holder main body and is screw-fitted into the thread portion, is provided on the outer circumference of the cylindrical portion.

According to a third aspect of the present invention, in the collet removing device for a tool holder according to the first aspect, the head restraint is supported by a bolt support portion formed at a distal end portion of the holder body and protrudes outside the distal end of the holder body. The end plate that abuts on the tip of the head of the draw bolt abuts, and the tip of the head engages with the male thread formed on the outer peripheral surface of the end of the holder body and the end of the head of the draw bolt. An outer cylinder accommodating the portion is integrally formed, and an insertion hole penetrating in the axial direction is formed in the end plate.

According to a fourth aspect of the present invention, in the collet removing device for a tool holder according to the first aspect, the head restraint is supported by a bolt support portion formed at a distal end portion of the holder main body and projects outside the distal end of the holder main body. The end plate with which the contact surface provided at the tip of the head of the pulling bolt abuts, and the pair of engaging grooves formed on the outer periphery of the end of the holder body are detachable from the direction orthogonal to the axial direction. A pair of columnar parts with which the engaging part engages are integrally formed, a through hole penetrating in the axial direction is formed in the end plate, and the columnar part has a gap on the outer peripheral side of the head of the pull bolt. It is designed to be located at.

According to a fifth aspect of the invention, in the collet removing device for the tool holder according to the first aspect, the head restraint comprises an external threaded cylinder which is screwed into the threaded portion to be formed on the inner periphery of the distal end of the holder body. , The contact surface that abuts the head of the draw bolt supported by the bolt support part in the holder body is provided at the tip, the inner diameter is made an insertion hole through which the operating rod can be inserted, and the tip of the rotating member is disengaged at the end. The engaging part is formed so as to engage with each other.

[0011]

According to the collet removing device of the tool holder of the first aspect of the present invention, when the tool is replaced, the head restraint is attached to the end portion of the holder main body while restraining the axial movement by screw fitting or the like. The distal end portion of the operating rod is penetrated through the insertion hole formed in the retainer from the outside of the distal end side, and the distal end portion is engaged with the engaging concave portion provided on the head portion of the pull bolt.

Then, the head of the pulling bolt is brought into contact with the contact surface of the restrainer, and the pulling bolt is rotated in the same direction by turning the operating rod in the loosening direction to form it on the holder main body. The head portion of the pull bolt is prevented from moving in the axial direction by the bolt support portion and the contact surface of the retainer, thereby forming a taper collet with a distal end portion screw-fitted to the pull bolt at the tip portion of the holder body. It is pushed out to the tip side of the tapered hole to release the tightening of the tapered portion of the collet by the peripheral surface of the tapered hole.

Therefore, even if the taper portion of the collet is strongly tightened on the peripheral surface of the tapered hole of the holder body, the collet and the tool can be pushed out with a relatively small force against the holder body to release the tightening, and The pull bolt and the taper collet do not rotate integrally with the holder, the collet can be easily extracted from the holder body and the tool can be easily extracted from the collet, and the tool can be easily replaced.

To install a new tool such as a new tool, fit the shank of this tool into the taper collet,
By means such as pull bolts that have been generally used,
By rotating the pull bolt in the tightening direction, the collet and the tool are pulled toward the distal end side, and these are held and fixed to the holder body.

According to the second aspect of the present invention, since the cylindrical portion of the head restraint formed in the shape of a bolt is screwed into the female screw portion of the inner peripheral surface of the end portion of the holder body, the head portion of the pull bolt is held by the holder. Suitable for use in tool holders located inside the body,
Further, the operating portion integrally formed with the cylindrical portion may be turned on the outer side of the end of the holder main body, and while the head restraint is simple in configuration, the operating portion can be easily turned, and further, the inner peripheral surface of the holder main body The forming screw portion can be used for mounting a member such as a pull stud for holding the tool holder to the spindle of the machine tool with the head restraint removed.

According to the third and fourth aspects of the present invention, the end plate of the head restraint is supported by the bolt supporting portion located at the end portion of the holder body, and the end plate is extended from the head portion of the pulling bolt protruding outside the end of the holder body. Since it is disposed on the side, it is suitable for use in a tool holder in which the head of the pull bolt projects, and the contact surface formed at the tip of the end plate is brought into contact with the end surface of the head of the pull bolt to The distal end of the operating rod penetrates the insertion hole that penetrates through the end from the outside of the distal end, and the distal end is engaged with the engaging recess provided on the head of the pull bolt to rotate the operating rod in the loosening direction. Since the pull bolt is rotated in the same direction, the length of the tip of the operating rod is short, and the pull bolt can be easily rotated.

In the invention according to claim 3, the male screw portion formed on the outer peripheral surface of the end portion of the holder main body which is screw-fitted to the outer cylinder integrally formed with the end plate is in a state where the head restrainer is removed. Thus, it can be used to mount a member for holding the tool holder on the spindle of the machine tool.

In the invention according to claim 4, the head restraint is
By moving in a direction orthogonal to the axial direction of the tool holder to disengage the tip engaging portions provided on the pair of columnar portions from the pair of engaging grooves formed on the outer periphery of the end portion of the holder body. Since the head restraint can be attached / detached to / from the holder main body, the head restraint can be attached / detached in a shorter time than with screw fitting.

According to a fifth aspect of the present invention, the head restraint is a male screw cylinder, and the whole is screw-fitted to the female screw member on the inner peripheral surface of the end portion of the holder body, so that the head portion of the pull bolt is inside the holder body. It is suitable for use in a tool holder located at, and can be provided at low cost because it can be housed in the holder body as a whole and is small in size and has a simple shape without an end plate. . Insert the tip of a rotating member such as a screwdriver from the outside of the holder body into the insertion hole, and releasably engage it with the engaging part provided at the end of the male screw cylinder to tighten or loosen it. Since it can be done, there is no hindrance to the operation.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. 1, 2 and 3 are claims 1 and 2 of the present invention.
A first embodiment corresponding to is shown. The tool holder collet removing device of the first embodiment includes a tool holder 1 and a head restraint 20.
And an operating rod 21.

As shown in FIGS. 1 and 2, the tool holder 1 is provided with a straight shank portion 3 on the end side of the holder body 2, and a flange portion 4 having a large outer diameter is provided on the tip side of the shank portion 3. A front end portion 6 is formed in series on the front end side of the flange portion 4 via a hexagonal nut-shaped portion 5.

An annular groove 3a is formed on the outer peripheral surface of the straight shank portion 3 near the central portion in the axial direction, and an annular recess 3b is formed on the end surface of the flange portion 4 on the outer peripheral side of the outer peripheral surface of the shank portion 3. An elastic member 7 which will be described later is fitted in the annular recess 3b, and six circular recesses 4a are formed on the outer peripheral portion of the flange portion 4 at regular intervals and extend in the circumferential direction toward the center in the radial direction.

On the outer periphery of the shank portion 3, a taper cone 8 whose tip end surface contacts the elastic member 7 is rotatably and axially movably fitted, and a washer 9 for preload adjustment which contacts the end surface of the taper cone 8. To the shank portion 3, the snap ring 10 supporting the end face of the washer 9 is engaged with the annular groove 3a of the shank portion 3, and the tapered cone 8 is pressed against the elastic member 7 via the washer 9 so that the elastic member 7 Is compressed and preloaded. The taper cone 8 has a 1/10 taper on the outer peripheral surface (taper angle 5 ° or more).
It has a loose taper.

The elastic member 7 is a combination of a non-compressed body 7a made of a metal plate ring such as a steel plate and a compressed body 7b made of a soft resin ring such as synthetic rubber, urethane-based, or Fluoro-based, and the shank portion 3 There are several in each.

Although not shown, the taper cone 8
Is a slant with respect to the axial direction and has a slit cut over the entire length at one location in the circumferential direction. An elastic body such as silicone, nylon, or synthetic rubber is filled in this slit to make it elastically deformable in the radial direction. There is. Then, the elastic body may be filled in the slit so as not to project from the inner and outer peripheral surfaces of the tapered cone, and may be biased in the radial expansion direction.

Further, on the outer peripheral surface of the portion of the shank portion 3 where the taper cone 8 is fitted, a lubricant enclosing groove (not shown) is formed in a mountain shape continuous in the circumferential direction, and the enclosing groove is filled with lubricating oil and grease. A lubricant such as is added so that the relative movement between the shank portion 3 and the taper cone 8 can be smoothly performed for a long period of time.

A taper hole 11 and a taper hole 11 for holding the collet are provided between the axially intermediate portion of the holder body 2 and the tip thereof.
With a straight hole 12 extending to the terminal side of the straight hole 12, and a bolt support portion 14 having a small diameter bolt insertion hole 13 formed at the terminal side of the straight hole 12 annularly protruding toward the center side. Is formed with an end hole 15 opening to the end surface of the holder body 2, and a female screw portion 15a is formed at an appropriate position in the axial direction of the end hole 15, and the holes 11, 12, 1 are formed.
3, 15 are provided in series so as to be concentric with the axis of the holder body 2.

In the taper hole 11 and the straight hole 12 of the holder body 2, the taper portion 16a on the tip side and the straight end portion 1 formed in series on the taper collet 17 are formed.
6b is inserted. The taper portion 16a of the taper collet 16 has a taper equal to that of the taper hole 11 formed on the outer peripheral surface thereof, and the cut portions 16c are formed at three circumferential positions at equal intervals. Each have a cutting fluid supply hole 16d formed therein, and the taper collet 16 has a distal end 16b having a female screw hole 16 penetrating the center thereof.
e is formed. The slit portion 16c is formed over the entire length of the tapered portion 16a, and the cutting fluid supply hole 16d is formed.
Is elongated from the vicinity of the tip of the taper portion 16a to the middle portion of the end portion 16b.

A pulling bolt 17 is inserted into the end hole 15 from the end side of the holder body 2, and a leg portion 17a of the pulling bolt 17 is inserted.
Is inserted into the bolt insertion hole 13 from the end side, and the male screw portion 17b formed on the leg portion 17a is attached to the end portion 1 of the collet 16.
In order to form 6b, it is screwed into the screw hole 16e.
The pulling bolt 17 has an engaging recess 17d having a regular hexagonal cross section in the head portion 17c, and a cutting fluid passage hole 17e having a small diameter is formed from the bottom of the engaging recess 17d to the tip of the leg 17a. It is formed so as to penetrate the shaft center portion. In addition,
The head portion 17c is supported on the end surface of the bolt support portion 14 of the holder body 2 via a washer 18 fitted to the leg portion 17a.

Further, in FIG. 1, 19 is a tool such as an end mill or boring bar in which the shank 19a is fitted to the taper collet 16. As shown in FIGS. 1 and 3, the head restraint 20 includes a straight shank portion 3 of the holder main body 2 at an axially intermediate portion of a columnar portion 20b integrally formed with a disc-shaped operation portion 20a. A male screw portion 20c is formed to be screwed into the screw portion 15a to form the terminal hole 15, and an insertion hole 20d is formed to penetrate the axial center portion of the restrainer 20 over its entire length. The hole 20d has a diameter such that the operating rod 21 can be loosely inserted therein.

By inserting the operation rod 21 into the insertion hole 20d from the distal end side of the head restraint 20, the tip 21a or the whole is engaged with the engagement recess 17d formed in the head 17c of the pull bolt 17. It has a regular hexagonal cross section and is bent into an L shape.

Next, the use of the tool holder collet removing device according to the first embodiment will be described. The shank 19 of the tool 19 is attached to the taper collet 16 of the tool holder 1.
a and insert the tip portion 21a of the operating rod 21 from the outer end of the holder body 2 into the end hole 15 of the straight shank portion 33.
To engage with the engaging recess 17d provided in the head 17c of the pull bolt 17.

In this state, the pulling bolt 17 is rotated in the same direction by turning the operation rod 21 in the tightening direction on the outer side of the end of the holder body 2, and the pulling bolt 17 moves the collet 16 to the end side of the holder body 2. The outer peripheral surface of the taper portion 16a of the collet 16 is pressed against the peripheral surface of the taper hole 11 provided at the tip of the holder body 2, the taper portion 16a is elastically deformed to reduce its diameter, and the collet 16 is restored by its restoring force. The holder body 2 is held and fixed, and the shank 19a of the tool 19 is held and fixed to the collet 16 by reducing the diameter of the collet 16.

The above-described operation is performed with the head restraint 20 removed from the holder main body 2 and the collet 16 fixed by an appropriate means, and after the operation is completed, it is provided in the end hole 15 of the holder main body 2. An external thread portion of a pull stud (not shown) is fastened to the thread portion 15a to fix the pull stud to the end portion of the holder body 2.

After that, the tool holder 1 is mounted on the spindle such as the main shaft of the machine tool by a conventionally known means, and the workpiece is cut using the tool 19 by the operation of the machine tool. If the above-mentioned machining with the tool 19 is repeated many times,
The blade portion of the tool 19 is worn or chipped, and the tool 1
9 will need to be replaced.

To replace the tool 19, the tool holder 1 is removed from the machine tool and carried to the tool replacement work site, where the pull stud is removed from the holder body 2, and the head restraint 20 is operated as shown in FIG. Hold the portion 20a and turn the head restraint 20 to install it in the end hole 15 of the holder body 2 so that the screw portion 1
The head restraint 20 is fixed to the end portion of the holder body 2 by screwing the male screw portion 20c formed on the columnar portion 20b of the head restrainer 20 into the screw 5a and tightening it.

In this state, the contact surface 20e at the tip of the cylindrical portion 20b of the head restraint 20 faces the end surface of the head 17c of the pull bolt 17 with a slight gap, and The tip of the insertion hole 20d is the head 17 of the pull bolt 17.
It opposes the engagement recess 17d provided in c.

Next, the distal end portion 21a of the operating rod 21 is inserted into the insertion hole 20d from the distal end side of the head restraint 20, and the most distal end portion of the operating rod 21 is engaged with the engaging recess 17d of the pull bolt 17. Let In this state, the tool body 2 and the head restraint 2
When the operating rod 21 is turned in the bolt loosening direction outside 0, the pulling bolt 17 rotates in the loosening direction and slightly moves to the distal end side, and the head 17c has a cylindrical shape of the head restraining device 20 on the terminal face. The contact surface 20e at the tip of the portion 20b contacts, and the head 17
Since the front end surface of c is supported by the end surface of the bolt support portion 14 provided on the holder main body 2 via the washer 18, the pull bolt 17 cannot move to the end side or the front end side in the axial direction. Therefore, when the pulling bolt 17 is further rotated in the loosening direction, the male screw portion 17b of the leg portion 17a and the screw hole 16e to be provided at the end portion 16b of the taper collet 16 are screw-fitted. The collet 16 is pushed out to the tip side of the holder body 2. Hold the collet 16 in the holder body 2
When pushed out toward the tip end side of the taper, the pressing of the outer peripheral surface of the taper portion 16a by the peripheral surface of the taper hole 11 is loosened, the taper portion 16a expands in diameter by the elastic restoring force, and the tightening of the tool 19 to the shank 19a is released. Then, the tool 19 can be easily pulled out from the collet 16.

After pulling out the tool 19 from the taper collet 16, a shank of another tool that can be used such as a new tool is fitted on the collet 16, the pull bolt 17 is tightened, and the head restrainer 20 is timed from the holder body 2. After removal, the holder main body 2 is attached with a pull stud so that the tool holder can be reused.

Then, in the above-mentioned operation of pulling out the tool 19, the hexagonal nut-shaped portion 5 of the holder body 2 is clamped and fixed by a vise fixed to the vise table of the exchange work place at a proper time,
It is preferable to perform the above-described loosening operation of the pull bolt 17 with the operation rod 21 in a state where the head restrainer 20 is held at the end portion of the holder body 2.

By doing so, even when the female screw hole 16e of the collet 16 is strongly tightened to the external thread portion 17b of the pull bolt 17, the pull bolt 17 and the collet 1 are provided.
6 and the tool 19 do not become idle with respect to the holder body 2, and the pull bolt 17 can be easily rotated with respect to the collet 16 in the loosening direction with a relatively small force. Can be easily pushed out to the tip side of the holder body 2.

Further, instead of tightening the pull stud on the screw portion 15a to be provided in the end hole 15 of the holder main body 2, the applicant of the present invention has previously proposed Japanese Patent Application No. 6-260.
As shown in the second embodiment of No. 615 (filed on October 25, 1994), a taper hole with a 1/10 taper (taper angle of a little over 5 °) provided at the tip of the parent sleeve has a 1/10 taper. The taper cone 8 is fitted, and the tension bolt supported in the parent sleeve is tightened to the female thread portion 15a, the tool holder 1 is detachably held and fixed to the parent sleeve, and the parent sleeve has a 7/24 taper (taper angle 16 °). (Strong) taper shank may be fitted and held in a 7/24 taper taper hole provided in a spindle of a machine tool, and may be detachably fixed to the spindle to process a workpiece.

FIGS. 4 and 5 show a second embodiment corresponding to claims 1 and 3 of the present invention. As shown in FIG. 4, the tool holder collet removing device of the second embodiment has a threaded portion 22 on the outer peripheral surface of the distal end portion of the straight shank portion 3 of the holder body 2.
And a ring-shaped bolt support portion 14 is provided on the center side of the end portion of the shank portion 3, and a leg insertion portion 13 of the support portion 14 has a leg portion 17a of a pulling bolt 17 from the end side.
The head 17c of the pull bolt 17 and the washer 18
Are projected to the end side of the holder body 2.

The male threaded portion 22 provided on the shank portion 3 has a threaded portion 23 to be provided on the outer cylinder 23b of the head restraint 23.
A is screwed. Head restraint 23
5, the end plate 23e is formed integrally with the outer cylinder 23b, and the accommodation chamber 23c for accommodating the head 17c of the pulling bolt 17 is formed at the end side in the outer cylinder 23b.
The female screw portion 23a is formed on the outer peripheral surface of the distal end portion having a larger inner diameter than the accommodating chamber 23c, and the insertion hole 23f of the operation rod 21 is formed in the end plate 23e so as to penetrate in the axial direction.
A contact surface 23g that contacts the head portion 17c of the pull bolt 17 is formed at the tip of the. The operating rod 21 has a tip 21a.
Is shorter than the tip of the operating rod 21 of the first embodiment.
The configuration of the second embodiment other than that described above is substantially the same as that of the first embodiment. Therefore, the same reference numerals as those in FIGS. 1 and 2 are used in FIG.

In the second embodiment, the shank 19a of the tool 19 is fitted and fixed to the taper collet 16 provided on the holder main body 2 of the tool holder 1 to hold the collet 16 on the holder main body 2 and the head restrainer 23. In the state where the above is removed, as shown in the first embodiment of Japanese Patent Application No. 6-260615 previously proposed by the applicant, a 1/10 taper hole provided at the tip of the parent sleeve has a 1/10 taper hole. The taper cone 8 is fitted, and the male screw portion 22 formed at the terminal end of the straight shank portion 3 is fastened to the threaded portion so as to be provided on the terminal side of the taper hole of the parent sleeve, so that the tool holder 1 can be attached to and detached from the parent sleeve. It is held and fixed, and the taper shank of the 7/24 taper of the parent sleeve is fitted and held in the 7/24 taper hole provided in the spindle of the machine tool and detachably fixed to the spindle. Performing cutting by a tool 19 to the crop.

When it becomes necessary to replace the tool 19 by repeating the above-mentioned processing, the tool holder 1 together with the parent sleeve is removed from the machine tool and carried to the tool replacement work place.
Here, the tool holder 1 is removed from the parent sleeve, and as shown in FIG. 4, the male screw portion 22 formed on the outer periphery of the end portion of the straight shank portion 3 of the holder main body 2 is attached to the inner end of the outer cylinder 23b of the head restraint 23. The head restraint 23 is fixed to the end portion of the holder main body 2 by screwing the screw portion 23a into the circumference to form the circumference and tightening the screw portion 23a.

In this fixed state, the head portion 17c of the pulling bolt 17 and the washer 18 protruding from the end of the shank portion 3 are placed in the accommodating chamber 23c of the outer cylinder 23b of the head restraint 22.
Are housed with a gap provided between them and the head restraint 2
The contact surface 23g at the tip of the end plate 23e of No. 2 has a pulling bolt 17
The head portion 17c faces the end surface of the head portion 17c with a slight gap, and the tip of the insertion hole 23f formed in the end plate 23e faces the engaging recess 17d provided in the head portion 17c of the pulling bolt 17.

Next, the distal end portion 21a of the operating rod 21 is inserted into the through hole 23f from the end side of the head restraint 23, and the operating rod 2
The leading edge of No. 1 is engaged with the engaging recess 17d of the pull bolt 17. In this state, the holder body 2 and the head restraint 2
When the operation rod 21 is turned in the bolt loosening direction from the outside of 3, the pulling bolt 17 slightly moves to the distal end side, and the head portion 17c thereof is moved.
The contact surface 23g at the tip of the end plate 23e of the head restraint 23 abuts on the end surface of the head holding member 23, and the end surface of the head 17c is supported by the end surface of the bolt support portion 14 provided on the holder body 2 via the washer 18. Therefore, the pull bolt 17 is attached to the axial end side,
Cannot move to either side of the tip.

Therefore, when the pulling bolt 17 is further rotated in the loosening direction, the screw hole 1 is formed in the male screw portion 17b of the leg portion 17a and the end portion 16b of the taper collet 16.
The collet 16 is pushed out to the tip side by being screw-fitted with 6e. When the collet 16 is pushed toward the tip side of the holder body 2, the pressing of the outer peripheral surface of the taper portion 16a by the peripheral surface of the taper hole 11 is loosened, the taper portion 16a expands in diameter due to the elastic restoring force, and the shank 19a of the tool 19 is struck.
The tool 19 can be easily pulled out from the tip of the collet 16 by releasing the tightening against the.

After the tool 19 is extracted from the taper collet 16, another usable tool is attached to the collet 16 in the same manner as in the first embodiment. The head restraint 23 is taken out from the holder main body 2 at a proper time, the holder main body 2 is attached to the parent sleeve, and the tool holder 1 can be reused. In addition, as in the case of the first embodiment, the above-described operation of extracting the tool 19 is performed by a vise with the holder main body 2
Holding the hexagonal nut-shaped portion 5 of FIG.
It is preferable to perform the loosening operation of the pulling bolt 17 by.

In the collet removing device of the second embodiment, like the first embodiment, the taper collet 16 can be easily pushed out to the tip side of the holder body 2, and the tool can be easily replaced. In addition, in the second embodiment, since the head portion 17c of the pulling bolt 17 projects from the end surface of the holder body 2, the length of the insertion hole 23f of the head restraint 23 and the tip portion 21a of the operation rod 21 is The length is shorter than that of the first embodiment, and the pulling bolt 17 can be easily rotated in the loosening direction.

In the second embodiment, the tool holder 1 is not held and fixed to the parent sleeve, but a member such as a pull stud is detachably fixed to the end portion of the holder main body 2 so that the tool holder 1 It is also possible to fit the taper cone 8 into the taper taper hole 10 and use it.

FIGS. 6, 7, and 8 are claims 1 and 2 of the present invention.
A third embodiment corresponding to No. 4 is shown. In the tool holder collet removing device of the third embodiment, as shown in FIG. 6, a pair of engagement grooves 24 are formed on the outer periphery of the end portion of the straight shank portion 3 of the tool holder 1. These engaging grooves 24 are formed by forming bottoms 24a in a straight line parallel to the diameter passing through the center of the shank portion 3 in the left and right directions, and symmetrically opposed to the left and right of the diameter.

Further, as in the second embodiment, a bolt support portion 14 is formed on the shank portion 3 on the center side of the end portion,
The leg portion 17a of the pulling bolt 17 is inserted into the bolt insertion hole 13 of the support portion 14 from the end side, and the head portion 17c of the pulling bolt 17 and the washer 18 are projected to the end side of the shank portion 3.

The tip end engaging portion 25a of the head restraint 25 is engaged with the engaging groove 24 provided in the shank portion 3. As shown in FIGS. 7 and 8, the head restraint 25 includes a disc-shaped end plate 2 having a larger outer diameter than the shank portion 3.
A pair of left and right columnar portions 25c are projected on the tip side of 5b,
On the inner surface of the columnar portion 25c, the tip end engaging portions 25a are projected toward the center side, and the arcuate groove 25 is formed on the end side of these engaging portions 25a.
d is formed, and the columnar portions 25c are symmetrically opposed to each other. Further, the end plate 25b has an insertion hole 25e for the operation rod 21 formed at the center and a contact surface 25e at the tip. The operating rod 21 has a tip 21a shorter than the tip of the operating rod of the first embodiment. The columnar portion 25c has an outer peripheral surface formed in an arc shape extending from the outer peripheral surface of the end plate 25b.

Since the structure of the third embodiment other than that described above is substantially the same as that of the first and second embodiments, FIG.
The same reference numerals as those in FIGS. 1, 2 and 4 are given to the inside and the description thereof will be omitted.

In the third embodiment, the shank 19a of the tool 19 is held and fixed to the taper collet 16 of the tool holder 1,
With the collet 16 fixed to the holder body 2 and the head restraint 25 removed, the collet 16 is detachably fixed to the spindle of the machine tool by an appropriate means, and the workpiece is cut by the tool 19.

When it becomes necessary to replace the tool 19 by repeating the above-described machining, the tool holder 1 is detached from the machine tool and carried to a tool replacement work site where the tool holder 1 can be attached to and detached from the spindle. If a member for holding and fixing is attached to, remove this member.

From the direction orthogonal to the axial direction of the end portion of the holder body 2, the tip end engaging portion 25a of the head restraint 25 is almost in the engagement groove 24 provided at the end portion of the taper shank portion 3 of the holder body 2. The head 17c of the pull bolt 17 and the washer 18 are engaged with each other without a gap, and the end plate 25 of the head restraint 25 is
It is surrounded by b and a pair of columnar portions 25c so that a slight gap can be formed between the contact surface 25f at the tip of the end plate 25b and the end surface of the head portion 17c. In this state, the arcuate groove 25 provided on the columnar portion 25c of the head restraint 25.
d is fitted in a portion of the shank portion 3 on the terminal side of the engagement groove 24 with almost no gap.

Next, the distal end portion 21a of the operating rod 21 is inserted into the insertion hole 25e from the end side of the head restraining member 25, and the operating rod 2
The leading edge of No. 1 is engaged with the engaging recess 17d provided in the head 17c of the pull bolt 17. In this state, the head restraint 2
By rotating the operating rod 21 in the bolt loosening direction on the outside of 5, the contact surface 25f of the end plate 25b of the head restraint 25 comes into contact with the head 17c of the pulling bolt 17, and the head 17c is washed by the washer 18 Since it is supported on the end surface of the holder main body 2 via, the movement of the pull bolt 17 in the axial direction is restricted.

Therefore, when the pull bolt 17 is further rotated in the loosening direction, the male thread portion 17b of the leg portion 17a and the female thread hole 16e of the taper collet 16 are screw-fitted to each other. 16 is pushed to the tip side, whereby the taper portion 16a expands in diameter by the elastic restoring force and releases the tightening of the tool 19 to the shank 19a, so that the tool 19 can be easily pulled out from the tip of the collet 16.

After the tool 19 is extracted from the taper collet 16, another tool is attached to the collet 16 in the same manner as in the first embodiment. The head restraint 25 may be left attached to the holder main body 2 when another tool is mounted, but the head restraint 25 is orthogonal to the axial direction of the holder main body 2 at a proper time after the tool 19 is extracted. Pull out in the direction you want to remove it. Furthermore, if necessary, in the tool holder 1,
A member for holding and fixing this to the spindle is attached, and the tool holder 1 can be reused. As in the case of the first embodiment, when pulling out the tool 19, the pulling bolt 17 is loosened by the operating rod 21 while the hexagonal nut-shaped portion 5 of the holder body 2 is tightened with a vise. Is preferred.

In the collet removing device of the third embodiment, like the first embodiment, the taper collet 16 can be easily pushed out to the tip side of the holder main body 2, and the collet removing device of the second embodiment is different from that of the second embodiment. Similarly, the operating rod insertion hole 25e of the head restraint 25 and the tip 21a of the operating rod 21 are short, and the pull bolt 17 can be easily rotated in the loosening direction.

Furthermore, in the third embodiment, by moving the head restraint 25 in a direction orthogonal to the axial direction of the end portion of the holder body 2, a pair of outer peripheral surfaces of the end portion of the holder body 2 is formed. In the engaging groove 24 of the columnar portion 25c of the head restraint 25.
Since the opposed front end engaging portions 25a provided in the above are engaged with each other in a disengageable manner, the operation of attaching / detaching the head restraint 25 to / from the holder body 2 can be performed in a short time.

9 and 10 show a fourth embodiment corresponding to claims 1 and 5 of the present invention. As shown in FIG. 9, the tool holder collet removing device of the fourth embodiment has a tool holder 1 having the same configuration as that of the first embodiment, and the head restraint 26 is different from that of the first embodiment.

As shown in FIG. 10, the head restraint 26 is made of a male screw cylinder, and has a screw portion 26a formed on the tip side portion of its outer circumference, and has an inner diameter similar to that of the operating rod of the first embodiment. The insertion hole 26b that allows the operation rod 21 to be inserted and removed, and the contact surface 26c that abuts the head portion 17c of the pulling bolt 17 at the tip.
And a distal end of a rotating member (not shown) composed of a driver is formed at an end thereof with an engaging portion 26d capable of engaging and disengaging. The engaging portion 26b is a linear groove formed on the diameter of the distal end. is there. In FIG. 9, the same symbols as those in FIG. 1 indicate the same parts.

In the fifth embodiment, similarly to the first embodiment, the tool 19 mounted on the tool holder 1 is used, and when the tool 19 needs to be replaced, the tool holder 1 is carried to the tool replacement work place. , Remove the pull stud from the tool body 2. Then, as shown in FIG. 9, the head restraint 26 is attached to the holder main body 2
The distal end of the turning member, which is a driver, is fitted into the end hole 15 of the holder body 2 from the outside of the end of the holder body 2.
By inserting it into the engaging portion 26b at the end of the head restraint 26, and turning the rotating member outside the end of the holder body 2, so that the male screw portion 26a of the head restraint 26 is held in the holder body 2. The head restraint 26 is fixed in the holder main body 2 and the turning member is pulled out of the holder main body 2 so as to be screwed into the screw portion 15a so as to be provided in the terminal end hole 15. In this state, the contact surface 26c at the tip of the head restraint 26 faces the end surface of the head 17c of the draw bolt 17 with a slight gap.

Next, the tip portion 21a of the operating rod 21 is inserted from the end side of the holder body 2, and the insertion hole 2 of the head restraint 26 is inserted.
6b, and pull the tip of the operating rod 21 into the bolt 17
The engaging recess 17d is engaged. In this state, when the operation rod 21 is turned outside the holder body 2 in the bolt loosening direction, the pulling bolt 17 slightly moves to the distal end side, and the head restraining member 26 is attached to the end face of the head restraining member portion 17c. Contact surface 2 at the tip of
6c comes into contact, and the pull bolt 17 cannot move to either the axial end side or the tip side.

Therefore, when the pulling bolt 17 is further rotated in the loosening direction, the taper collet 16 is moved to the holder main body 2
Of the taper member 16a of the collet 16 by the peripheral surface of the taper hole 11 is loosened, the taper portion 16a is expanded in diameter by the elastic restoring force, and the tightening of the tool 19 to the shank 19a is released. Thus, the tool 19 can be easily pulled out from the tip of the collet 16. After that, another usable tool is attached to the collet 16 in the same manner as in the first embodiment. At a suitable time, the head restraint 26 is removed from the holder main body 2 by using the rotating member, and the pull stud is attached to the holder main body 2 so that the tool holder can be reused.

In the collet removing device of the fourth embodiment, like the first embodiment, the taper collet 16 can be easily pushed out to the tip side of the holder body 2 and the tool can be easily replaced. In addition, in the fourth embodiment, the entire head restraint 26 can be housed in the holder body 2 and is small in size, and since it has a simple shape without an end plate, it can be provided at low cost.

In the fourth embodiment, the shape of the engaging portion of the head restraint can be changed as appropriate, for example, a cross groove or a regular hexagonal recess, and the tip of the rotating member such as a driver can be changed. The shape of the portion can be appropriately changed as long as it can be detachably engaged with the shaped portion and the head restraint can be rotated from outside the end of the holder body.

In the first to third embodiments, the drawing bolt 17 is provided with the cutting fluid flow passage 17e, and the taper collet 1 is provided.
Since the cutting fluid supply hole 16d is provided in 6, the cutting fluid is pressure-fed from the end side of the holder body 2 to the flow passage 17e by an appropriate means, so that the blade portion and the blade portion of the tool 19 are fed from the supply hole 16d. The cutting fluid can be supplied to the machining part of the work piece.

In the present invention, the cutting fluid flow passage of the pulling bolt and the cutting fluid supply hole of the taper collet may be omitted, and the engaging concave portion and the operating rod provided on the head of the pulling bolt may be, for example, a cross section. The shape can be changed appropriately if the tip of the operating rod can be engaged with the engaging recess in a disengageable manner and the pull bolt can be turned, such as by making the surface square. Can be changed appropriately, and the shape is not limited to the L-shape, but may be a T-shape.

[0074]

As described above, in the collet removing device for the tool holder according to the invention of claim 1, when the tool is replaced, the head restraint is axially attached to the end portion of the holder main body by screw fitting or the like. Of the operating rod is inserted through the insertion hole formed in the retainer from the outside of the distal end side, and the distal end is engaged with the engaging recess provided on the head of the pulling bolt. To combine. Then, with the head of the pulling bolt in contact with the contact surface of the retainer, the pulling bolt is rotated in the same direction by turning the operating rod in the loosening direction, and the bolt supporting portion formed on the holder body. And the contact surface of the retainer prevent the head of the pull bolt from moving in the axial direction, so that a taper collet having a distal end screw-fitted to the pull bolt is formed in the tapered hole of the holder body. It is pushed to the tip side, and the tightening of the tapered portion of the collet by the peripheral surface of the tapered hole is released.

Therefore, even if the tapered portion of the collet is strongly tightened on the peripheral surface of the tapered hole of the holder main body, the collet and the tool can be pushed out with a relatively small force against the holder main body to release the tightening, and The pull bolt and the taper collet do not rotate integrally with the holder, the collet can be easily extracted from the holder body and the tool can be easily extracted from the collet, and the tool can be easily replaced.

According to the second aspect of the present invention, since the columnar portion of the head restrainer formed in a bolt shape is screwed into the female screw portion on the inner peripheral surface of the end portion of the holder body, the head portion of the pull bolt is held by the holder. Suitable for use in tool holders located inside the body,
Further, the operating portion integrally formed with the cylindrical portion may be turned on the outer side of the end of the holder main body, and while the head restraint is simple in configuration, the operating portion can be easily turned, and further, the inner peripheral surface of the holder main body The forming screw portion can be used for mounting a member such as a pull stud for holding the tool holder to the spindle of the machine tool with the head restraint removed.

According to the third and fourth aspects of the present invention, the end plate of the head restraint is supported by the bolt supporting portion located at the end portion of the holder body, and the end plate is extended from the head portion of the pulling bolt protruding outside the end of the holder body. Since it is disposed on the side, it is suitable for use in a tool holder in which the head of the pull bolt projects, and the contact surface formed at the tip of the end plate is brought into contact with the end surface of the head of the pull bolt to The distal end of the operating rod penetrates the insertion hole that penetrates through the end from the outside of the distal end, and the distal end is engaged with the engaging recess provided on the head of the pull bolt to rotate the operating rod in the loosening direction. Since the pull bolt is rotated in the same direction, the length of the tip of the operating rod is short, and the pull bolt can be easily rotated.

Further, in the invention according to claim 3, the male screw portion formed on the outer peripheral surface of the end portion of the holder main body which is screw-fitted to the outer cylinder integrally formed with the end plate is in a state where the head restrainer is removed. Thus, it can be used to mount a member for holding the tool holder on the spindle of the machine tool.

In the invention according to claim 4, the head restraint is
By moving in a direction orthogonal to the axial direction of the tool holder to disengage the tip engaging portions provided on the pair of columnar portions from the pair of engaging grooves formed on the outer periphery of the end portion of the holder body. Since the head restraint can be attached / detached to / from the holder main body, the head restraint can be attached / detached in a shorter time than with screw fitting. In the invention according to claim 5, the head restraint is a male screw cylinder, and the whole is screw-fitted to the female screw member on the inner peripheral surface of the end portion of the holder body, so that the head portion of the pull bolt is located in the holder body. It is suitable for use in a tool holder, and can be provided at a low price because it can be housed in the holder body as a whole and is compact and has a simple shape without an end plate.

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view showing a collet removing device for a tool holder according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the collet removing device for the tool holder shown in FIG.

FIG. 3 is a half-vertical longitudinal sectional front view of a head restraint used in the collet removing device for the tool holder shown in FIG.

FIG. 4 is a half-vertical longitudinal sectional front view showing a collet removing device for a tool holder according to a second embodiment of the present invention.

FIG. 5 is a half-vertical longitudinal sectional front view of a head restraint used in the collet removing device for the tool holder shown in FIG.

FIG. 6 is a half-vertical vertical sectional front view showing a collet removing device for a tool holder according to a third embodiment of the present invention.

FIG. 7 is a front view of the head restraint used in the collet removing device for the tool holder shown in FIG.

FIG. 8 is a bottom view of the head restraint shown in FIG.

FIG. 9 is a partial vertical sectional view showing a collet removing device for a tool holder according to a fourth embodiment of the present invention.

10 is a semi-vertical longitudinal sectional view of a head restraint used in the collet removing device for the tool holder shown in FIG.

[Explanation of symbols]

 1 Tool Holder 2 Holder Body 3 Straight Shank Part 4 Flange Part 5 Hexagonal Nut Shaped Part 6 Tip Part 7 Elastic Member 8 Tapered Cone 10 Snap Ring 11 Tapered Hole 12 Straight Hole 13 Bolt Insertion Hole 14 Bolt Support 15 End Portion 15a Female Thread Part 16 Tapered collet 16a Tapered part 16b End part 16e Female screw hole 17 Drawing bolt 17a Leg part 17b Male screw part 17c Head part 17d Engagement recess 18 Washer 19 Tool 19a Shank 20 Head restrainer 20a Operating part 20b Cylindrical part 20c Male thread part 20d Insertion hole 20e Contact surface 21 Operation rod 21a Tip part 22 Male thread part 23 Head restraint 23a Female thread part 23b Outer cylinder 23c Storage chamber 23e End plate 23f Insertion hole 23g Contact surface 24 Engagement groove 25 Head Suppressor 25a Tip engaging portion 25 End plate 25c columnar portion 25d arc-shaped grooves 25e insertion hole 25f contact surface 26 head suppressing member 26a male screw part 26b insertion hole 26c contact surface 26d engaging portion

Claims (5)

[Claims] 1. A taper in which a head portion of a pulling bolt is supported on a distal end side of a bolt supporting portion formed on a holder main body, and a leg portion extending to a tip end side of the pulling bolt is fitted in a taper hole of the tip end portion of the holder main body. A collet removing device for a tool holder that screw-fits to the end of the collet, pulls the collet and the tool fitted to the collet to the end side of the holder body, and holds and fixes the collet. A head restraint that restrains movement and is detachably mounted, and an operation rod that rotates a pull bolt by engaging a tip portion with an engaging recess provided in the head of the pull bolt, the head restraint A contact surface that abuts the head end surface of the pull bolt,
A collet removing device for a tool holder, characterized in that an insertion hole for inserting the distal end portion of the operation rod is formed so as to penetrate in the axial direction. 2. The head restraint includes a manipulating portion located outside the distal end of the holder body, and a head portion of a pull bolt supported by a bolt support portion whose contact surface provided at the tip is located at the distal end portion inside the holder body. The columnar portion that abuts against is integrally formed into a bolt shape, and an insertion hole that penetrates the operation portion and the columnar portion in series is formed, and is formed on the outer periphery of the columnar portion on the inner periphery of the end portion of the holder body. The collet removing device for a tool holder according to claim 1, wherein a male screw portion that is screw-fitted to the screw portion is provided. 3. The head restraint is an end where a contact surface provided at the tip abuts a head of a pull bolt that is supported by a bolt support portion formed at the end of the holder body and projects outside the end of the holder body. The plate and the outer cylinder, the tip of which is screw-fitted to the external thread formed on the outer peripheral surface of the end of the holder body and the end of which is an outer cylinder for accommodating the head of the draw bolt, are integrally formed on the end plate. The tool holder collet removing device according to claim 1, wherein an insertion hole is formed so as to penetrate in the axial direction. 4. The head restraint is an end with which a contact surface provided at the tip abuts a head of a pull bolt that is supported by a bolt support portion formed at the end of the holder body and projects outside the end of the holder body. The plate and the pair of columnar parts, into which the tip engaging parts engage with each other, are detachably engaged with the pair of engaging grooves formed on the outer periphery of the end portion of the holder main body in a direction orthogonal to the axial direction. Then, a through-hole penetrating in the axial direction is formed in the end plate, and the columnar portion is located with a gap on the outer peripheral side of the head portion of the pulling bolt. Collet removing device for tool holder. 5. The head restraint comprises a male screw cylinder which is formed on the inner periphery of the end portion of the holder body and is screw-fitted to the screw portion,
The contact surface that comes into contact with the head of the draw bolt supported by the bolt support in the holder body is provided at the tip, and the inner diameter is used as an insertion hole through which the operating rod can be inserted, and the tip of the rotating member can be engaged and disengaged at the end. The collet removing device for a tool holder according to claim 1, wherein an engaging portion that engages with is formed.