JP2001009657A - Tool holder mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a single space for all tool holders and to reliably mount the tool holder on a main spindle without lowering adhesion between a taper junk part and a taper hole even when wear occurs to the taper hole of the main spindle. SOLUTION: The taper shank part 14 of a tool holder 13 having a flange part 15 for grasping is inserted in the taper hole 11 of the main spindle 10 of a tool machine. The taper shank part 14 is closely fitted in a taper hole 11 by a pull stud drawing mechanism 12 to mount the tool holder 13 on the main spindle 10 and further, a given gap determined according to an industrial specification is provided between the end face 101 of the main spindle 10 and the end face 152, positioned facing the end face, of a flange part 15. In a so formed mounting device for a tool holder, an annular spacer 17 having thickness equivalent to ± manufacture error of a given gap is adhered to a spot, where the end face 101 of the main spindle 10 is positioned opposite to the end face 152 of the flange part 15, by a layer-form adhesive 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder mounting device for mounting a tool holder holding a cutting tool to a spindle of a machine tool such as a machining center.

[0002]

2. Description of the Related Art As shown in FIG. 8, a tool holder 30 used for a machine tool such as a machining center has a tapered shank portion 31 and a gripping flange provided at a large-diameter end of the tapered shank portion 31. Part 32 and this flange part 3
2 from the end face on the side opposite to the taper shank
A cylindrical tool mounting portion 33 is provided which extends in the direction opposite to the direction 1 and coincides with the axis of the tapered shank portion 31.

[0003] When the tool holder 30 having the above configuration is mounted on the main shaft 40 of a machine tool, the taper shank portion 31 of the tool holder 30 is inserted into a taper hole 41 provided in the main shaft 40.
The insertion end of the taper shank portion 31 is connected to a pull-stat retracting mechanism (not shown) provided in the main shaft 40 and pulled rearward, whereby the taper shank portion 31 is closely fitted to the taper hole 41, and the tool holder 30 is attached. The main shaft 40 is attached.

According to the JIS standard or the ISO standard, an end surface 401 of a main shaft 40 and a taper shank opposed to the end surface 401 of the main shaft 40 are required to closely fit the taper shank portion 31 of the tool holder 31 into the taper hole 41 of the main shaft 40. A predetermined allowable gap D (2) is provided between the end surfaces 311 of the flange portions 32 of the portion 31.
(approximately 3 mm to 3 mm), and a manufacturing error of the tapered shank portion 31 with respect to the allowable gap D is specified to be ± 0.4 mm.

However, when an allowable gap D is provided between the end surface 401 of the main shaft 40 and the end surface 311 of the flange portion 32 of the tapered shank portion 31, the tapered hole 41 of the main shaft 40 and the tapered shank portion 31 of the tool holder 31 are closely fitted. However, the flange end face 311 of the tool holder 30 cannot be brought into close contact with the end face 401 of the spindle 40. As a result, the cutting is added to the taper shank portion 31 of the tool holder 31.
The taper hole 41 and the taper shank 3
In addition to the fretting corrosion phenomenon and the like, the surface in close contact with 1 is liable to be rubbed, and the rigidity between the tool holder 31 and the main shaft 40 is reduced so that heavy cutting cannot be performed.

Therefore, conventionally, Japanese Utility Model Laid-Open No. 6-15
No. 947, a horseshoe-shaped spacer 3 having a thickness corresponding to an allowable gap formed between a reference end surface of a spindle tip and a flange end surface of a tool holder.
A tool holder mounting device having a structure in which the screws 4 are combined to be attached to the end surfaces of the flange portions of the tool holder by screws has been proposed.

[0007]

In the conventional tool holder mounting apparatus as described above, the flange end face 311 of the tool holder 30 is connected to the main shaft 40 via the spacer 34 screwed to the flange end face 311 of the tool holder 30. Tip surface 40
1, the rigidity of coupling between the tool holder 31 and the spindle 40 is increased, and heavy cutting can be easily performed.
However, on the other hand, since the spacers 34 having a thickness corresponding to the allowable gap D must be prepared for each tool holder, the production and management of the spacers 34 are complicated and cost increases. Further, since the spacer 34 is screwed, a screw hole can be formed in advance in a newly manufactured machine tool. However, in an existing machine tool, a spindle which requires the highest accuracy of the machine tool is required. There is a great problem in terms of precision in machining screw holes.

The present invention has solved the above-mentioned conventional problems. An object of the present invention is to enable a single spacer to be used for all tool holders, and to facilitate the use of a new or existing machine tool. It can be attached. Another object of the present invention is to provide a highly safe tool holder mounting device in which the spacer is formed in a ring shape so that the spacer does not fly out even when rotated at a high speed. In addition, the present invention provides that, even when the gap between the end face of the main spindle and the end face of the gripping flange portion is smaller than the gap specified by the industrial standard, the gap defined by the industrial standard is a spacer bonded to the tip end face of the main spindle. It is an object of the present invention to provide a tool holder mounting device that can be used for a tool holder that cannot be formed.

[0009]

According to a first aspect of the present invention, there is provided a tool holder having a tapered hole formed in a main shaft of a machine tool, the tapered hole having a flange portion for gripping. Insert the shank part, tightly fit the tapered shank part into the tapered hole by the pull stud retracting mechanism provided on the spindle, and attach the tool holder to the spindle,
And a tool holder mounting device in which a predetermined gap defined by an industrial standard is formed between a tip end surface of the spindle and an end surface of the gripping flange portion facing the tip end surface, wherein the gripping of the spindle tip end surface is performed. A ring-shaped spacer having a thickness corresponding to the predetermined gap ± the manufacturing error is bonded to a portion facing the end face of the flange portion with a layer adhesive.

[0010] The invention according to claim 2 is characterized in that the spacer is made of wear-resistant steel or hard rubber. According to a third aspect of the present invention, an uneven portion is formed on the surface of the spacer on which the adhesive is applied, so as to increase the adhesiveness with the end face of the spindle. The invention according to claim 4, wherein the concave and convex portions extend in the width direction of the ring-shaped spacer and are formed in a large number along the circumferential direction of the spacer,
It is characterized by comprising one of a plurality of grooves formed concentrically on the adhesive application surface of the spacer and a number of counterbore holes formed on the adhesive application surface of the spacer. The invention according to claim 5 is characterized in that the spacer has a notch at a position corresponding to a drive key protruding from the end face of the spindle. According to a sixth aspect of the present invention, when mounting the tool holder, a gap between the front end face of the main spindle and the end face of the gripping flange portion opposed thereto is smaller than a gap defined by an industrial standard. The surface opposed to the flange end face is ground by an amount corresponding to the amount obtained by subtracting the gap between the spindle front end face and the gripping flange end face of the tool holder to be mounted from the gap defined by the industrial standard, and the spacer is formed. Characterized by a reduced thickness. The invention according to claim 7 is characterized in that a thickness of a peripheral portion of a notch portion of the spacer facing an end surface of the gripping flange portion is smaller than a thickness corresponding to the predetermined gap ± manufacturing error. I do.

In the present invention, since a spacer having a thickness corresponding to a predetermined gap ± a manufacturing error is bonded to the end face of the spindle with an adhesive, a single spacer can be used for all the tool holders and the tool can be used. The end face of the flange portion of the holder can be securely adhered to the end face of the spindle via the spacer, and the spacer is formed in a ring shape, so that the spacer does not pop out even when rotated at high speed.
It is safe. In addition, in the present invention, in particular, by forming the spacer from wear-resistant hard rubber, even if abrasion occurs in the tapered hole of the main shaft, the adhesion of the tapered shank portion and the tapered hole is absorbed by absorbing the wear by the spacer. The tool holder can be securely attached to the spindle without lowering the tool holder. Further, in the present invention, by forming the uneven portion on the adhesive-coated surface of the spacer, the adhesiveness with the end face of the spindle can be increased, and strong adhesion can be achieved. Further, in the present invention, by providing a cutout portion at the position of the spacer corresponding to the drive key protruding from the spindle end face, the spacer can be bonded to the spindle end face without causing interference with the drive key.

Further, in the present invention, when a tool holder in which the gap between the front end face of the spindle and the end face of the gripping flange portion is smaller than the gap defined by the industrial standard, the space between the end face of the spacer holding flange portion and the end face of the spacer. By grinding the opposing surface by the amount equivalent to the gap defined by the industrial standard minus the gap between the spindle tip surface and the gripping flange end surface to reduce the thickness of the spacer, the spindle tip surface The bonded spacer can be used for tool holders that cannot form the gap specified by the industrial standard, and the tool holder can be securely attached to the spindle without reducing the adhesion between the tapered shank and the tapered hole. it can. Further, in the present invention, the thickness of the peripheral portion of the notch portion of the spacer opposed to the end surface of the gripping flange portion is made smaller than a thickness corresponding to a predetermined gap ± a manufacturing error, so that the drive shaft can be mounted on the tip end surface of the spindle. Even when the key is protruded, the spacer adhered to the front end surface of the spindle can be easily ground to a required thickness.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a tool holder attaching device according to an embodiment of the present invention, and FIG. 2 is a plan view showing an example of a spacer according to the embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a main spindle of a machine tool such as a machining center. The main spindle 10 is formed with a tapered hole 11 for mounting a tool. A pull stud mechanism 12 for mounting in a tightly fitted state is provided.

The tool holder 13 has a tapered hole 1 of the main shaft 10.
1, a gripping flange 15 formed at a large-diameter end of the tapered shank 14, and a tapered shank from an end face of the flange 15 on the side opposite to the tapered shank. A cylindrical tool mounting portion 16 is provided extending in the direction opposite to the portion 14 so as to coincide with the axis thereof, and the flange portion 15 has an end face 10 of the main shaft 10.
1 is formed with a drive key groove 151 which engages with the drive key 102 protruding from the drive key 102.

At the end face 101 of the spindle 10 opposite to the end face 152 of the gripping flange 15, the flange end face 152 of the tool holder 13 is restrained and the
A spacer 17 is attached by a layered (for example, 0.3 mm or less in thickness) adhesive 18 to increase the coupling rigidity with the adhesive. As the adhesive, a two-component mixed epoxy-compound resin (for example, “ThreeBond adhesive” manufactured by Osaka Three Bond Co., Ltd., and “Araldite Standard Adhesive” manufactured by Chise Nagase) is used.

The spacer 17 is formed in a ring shape from wear-resistant steel or hard rubber corresponding to the flange end face 152 of the tool holder 13. The thickness of the spacer 17 is a predetermined allowable gap (a gap formed between the end face 101 of the main shaft 10 and the end face 152 of the flange portion 15, for example, about 3 mm) specified by JIS or ISO standards. ) Due to manufacturing error (for example, ± 0.4m
m), the thickness is set to a thickness corresponding to the allowable gap ± the manufacturing error. In actuality, with the tool holder 13 mounted on the spindle 10, the end face 101 of the spindle 10 and the flange 15 are The gap generated between the end faces 152 is measured by a micrometer or the like, and the thickness of the spacer 17 is set based on the measured value.

On the adhesive-applied surface of the spacer 17, an uneven portion 171 for increasing the adhesiveness with the end surface 101 of the main shaft 10 is formed. The uneven portion 171 extends in the width direction of the ring-shaped spacer 17 and
And a plurality of V-shaped or flat-shaped grooves A formed in the circumferential direction. Further, in the spacer 17, a cutout portion 172 is formed at a position corresponding to the drive key 102 protruding from the end face 101 of the main shaft 10. The notch 172 is used to connect the spacer 17 to the end face 10 of the spindle 10.
This is to prevent interference with the drive key 102 when bonding to the drive key 102.

According to the tool holder mounting apparatus of the present embodiment configured as described above, the spacer 17 having a thickness corresponding to a predetermined gap ± a manufacturing error is fixed to the main shaft 1 with an adhesive.
In this configuration, the single spacer 17 can be used for all the tool holders, and the flange end surface 152 of the tool holder 13 is securely brought into close contact with the end surface 101 of the spindle 10 via the spacer 17. be able to. Even if the tapered hole 11 of the main shaft 10 is worn while the tool holder 13 is repeatedly inserted and removed, the adhesion between the tapered shank portion 14 and the tapered hole 11 is improved by absorbing the wear with the layer of the adhesive 18. The tool holder 13 can be securely attached to the main shaft 10 without lowering.

In particular, in this embodiment, the main shaft 1 is formed by using a hard rubber having abrasion resistance for the spacer 17.
Even if abrasion occurs in the 0 tapered hole 11, this is
7, the tool holder 13 can be more securely attached to the main shaft 10 without reducing the adhesion between the tapered shank portion 14 and the tapered hole 11. Further, in the present embodiment, by forming the uneven portion 171 on the adhesive applied surface of the spacer 17, an anchoring effect of the adhesive 18 on the spacer 17 is exerted and the end face 10 of the main shaft 10 is formed.
1 can be increased, and strong adhesion can be achieved.

FIG. 3 is a plan view showing another embodiment of the spacer according to the present invention. In FIG. 3, FIG.
The difference from the spacer 17 shown in FIG. 1 is that the concavo-convex portion 171 is formed by forming a plurality of grooves B concentrically on the adhesive applied surface of the spacer 17.
In such an embodiment, the same operation and effect as the case shown in FIG. 2 can be obtained.

FIG. 4 is a plan view showing still another embodiment of the spacer according to the present invention. In FIG.
The difference from the spacer 17 shown in FIG. 2 lies in that a large number of counterbore holes C are formed in the entire area of the adhesive-applied surface of the spacer 17 so that the uneven portion 171 is formed. In such an embodiment, the same operation and effect as the case shown in FIG. 2 can be obtained.

As shown in FIG. 5, the tool holder on which the spacer according to the present invention is bonded cannot secure the allowable gap defined by the industrial standard, that is, the gap between the flange end face and the spindle end face is defined by the industrial standard. Less than the allowable clearance (for example, when the clearance is less than about 0.5 mm to 1 mm)
The case where the tool holder can be mounted will be described. As shown in FIG. 1, when a tool holder having a gap between an end face of a flange portion and an end face of a spindle less than or equal to an allowable gap defined by an industrial standard is attached to a spindle to which a spacer having a thickness of an allowable gap ± a manufacturing error is adhered. The spacer hinders the tapered shank of the tool holder from being drawn sufficiently into the tapered hole of the spindle, resulting in reduced adhesion between the tapered shank and the tapered hole, and secure attachment of the tool holder to the spindle. A problem arises.

Therefore, in the present invention, as shown in FIG.
The surface 173 facing the flange end face of the grinding wheel device 20 by an amount corresponding to the amount obtained by subtracting the gap between the spindle front end face and the flange end face of the tool holder to be mounted from the allowable gap defined by the industrial standard. Grind and adapt the thickness of the spacer 17 to the tool holder to be mounted. As a method of grinding the spacer 17 in this case, as shown in FIG. 5, the spindle 10 is rotated in the direction of the arrow, and at the same time, the grinding wheel device 20 is rotated by the arrows X and Y while the grinding wheel 201 is rotated.
By moving in the axial direction and feeding in the Z-axis direction, the surface 17 facing the flange end face of the spacer 17 is formed.
Grind 3 At this time, if the drive key 102 (see FIG. 1) of the spindle 10 is detachable, the drive key 102 is detached from the spindle 10.

According to such an embodiment of the present invention,
The surface 173 facing the flange end surface of the spacer 17 is
Since the thickness of the spacer is reduced by grinding by the amount equivalent to the amount obtained by subtracting the gap between the end face of the flange portion of the tool holder and the tip face of the spindle from the gap specified by the industrial standard,
The spacer bonded to the spindle tip surface can be used for tool holders that cannot form the gap specified by the industrial standard, and the tool holder can be securely attached to the spindle without reducing the adhesion between the tapered shank and the tapered hole. Can be attached to

Referring to FIGS. 6 and 7, a drive key-integrated spindle to which the spacer according to the present invention is adhered has a tool holder in which it is not possible to secure an allowable clearance defined by an industrial standard, that is, between a flange end face and a spindle end face. The following describes a case in which a tool holder having a gap smaller than the allowable gap defined by the industrial standard (for example, smaller than the allowable gap of about 0.5 mm to 1 mm) can be mounted. In this case, as shown in FIG. 7, the thickness of the peripheral portion (hatched region) 175 of the notch 172 of the spacer 17 facing the end face of the flange portion of the tool holder corresponds to the allowable gap ± the manufacturing error. For example, it is made thinner by about 0.6 mm to 1.1 mm than the thickness.

When a tool holder having a gap between the end face of the flange portion and the end face of the spindle less than or equal to an allowable gap defined by the industrial standard is attached to the spindle to which the spacer 17 is adhered, as shown in FIG. With the rotation of the spindle 10 stopped, the grinding wheel device 20 is moved in the directions of the arrows X and Y while rotating the grinding wheel 201, and is fed in the direction of the Z axis. Point 1
The surface 173 facing the flange end surface of the spacer 17 excluding 75 is ground. According to such an embodiment of the present invention, even when the drive key 102 protrudes from the tip end surface 101 of the spindle 10, the spacer 17 adhered to the tip end surface of the spindle is easily ground to a required thickness. can do.

[0027]

As described above, according to the present invention, since the spacer having the thickness corresponding to the predetermined gap ± the manufacturing error is bonded to the end face of the main shaft by the adhesive, all the single spacers can be used. Can be used as a tool holder, and the end face of the flange portion of the tool holder can be securely brought into close contact with the end face of the spindle through the spacer. Further, since the spacer is formed in a ring shape, the spacer pops out even when rotated at high speed. And safety can be improved.

Further, according to the present invention, particularly when the spacer is made of wear-resistant hard rubber, even if abrasion occurs in the tapered hole of the main shaft, the abrasion is absorbed by the spacer so that the tapered shank portion is formed. The tool holder can be securely attached to the spindle without lowering the adhesiveness of the hole. Further, according to the present invention, by forming the uneven portion on the adhesive-coated surface of the spacer, the adhesiveness with the end face of the spindle can be increased, and strong adhesion can be achieved. Further, according to the present invention, by providing a notch at a position of the spacer corresponding to the drive key protruding from the end face of the spindle, the spacer can be bonded to the end face of the spindle without causing interference with the drive key.

Further, according to the present invention, when a tool holder in which the gap between the front end face of the spindle and the end face of the gripping flange portion is smaller than the gap defined by the industrial standard, the end face of the spacer holding flange portion is used. By reducing the thickness of the spacer by grinding the surface opposite to the amount corresponding to the amount obtained by subtracting the gap between the spindle front end surface and the gripping flange end surface from the gap defined by the industry standard, the spindle front end surface The spacer bonded to the tool can be used for a tool holder that cannot form the gap specified by the industrial standard, and the tool holder can be securely attached to the spindle without decreasing the adhesion between the tapered shank and the tapered hole. Can be. Further, according to the present invention, the thickness of the peripheral portion of the notch portion of the spacer facing the end surface of the gripping flange portion is made smaller than a thickness corresponding to a predetermined gap ± a manufacturing error, so that Even when the drive key is protruded, the spacer adhered to the tip surface of the spindle can be easily ground to a required thickness.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a tool holder attaching device according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating an example of a spacer according to the embodiment of the present invention.

FIG. 3 is a plan view showing another embodiment of the spacer according to the present invention.

FIG. 4 is a plan view showing still another embodiment of the spacer according to the present invention.

FIG. 5 is an explanatory view showing a case where a tool holder in which it is not possible to secure an allowable gap defined by an industrial standard can be mounted on a spindle to which a spacer according to the present invention is bonded.

FIG. 6 is an explanatory diagram showing a case where a tool holder which cannot secure an allowable gap defined by an industry standard can be mounted on a drive key integrated type spindle to which a spacer according to the present invention is adhered.

FIG. 7 is a bottom view of the spacer shown in FIG. 6;

FIG. 8 is a longitudinal sectional view of a conventional tool holder mounting device.

DESCRIPTION OF SYMBOLS 10 Spindle 101 End face 102 Drive key 11 Tapered hole 12 Pull stud mechanism 13 Tool holder 14 Tapered shank part 15 Flange part 152 Flange part end face 17 Spacer 171 Uneven part 18 Adhesive 20 Grinding wheel device 201 Grinding wheel 201

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yusaku Yamamoto 1-6-153 Motomachi, Higashi-Osaka-shi, Osaka F-term in Niken Kousaku Co., Ltd. (reference) 3C016 FA21

Claims (7)

[Claims] 1. A taper shank portion of a tool holder having a gripping flange portion is inserted into a taper hole provided on a main shaft of a machine tool, and the taper shank portion is inserted into the taper hole by a pull stud retracting mechanism provided on the main shaft. A tool holder attached to the main shaft by tight fitting with the main shaft, and a predetermined gap defined by an industrial standard is formed between a front end surface of the main shaft and an end surface of the gripping flange portion opposed thereto. In the holder mounting device, a ring-shaped spacer having a thickness corresponding to the predetermined gap ± manufacturing error is adhered to a portion of the main shaft front end surface facing the end surface of the gripping flange portion with a layer adhesive. A tool holder mounting device characterized by the above-mentioned. 2. The tool holder mounting device according to claim 1, wherein the spacer is made of wear-resistant steel or hard rubber. 3. The tool holder mounting device according to claim 1, wherein an uneven portion is formed on an adhesive-coated surface of the spacer to increase adhesiveness with a spindle end surface. 4. A plurality of grooves formed in the radial direction of the ring-shaped spacer and formed in a large number along the circumferential direction of the spacer, and a plurality of grooves formed concentrically on the adhesive application surface of the spacer. 4. The tool holder mounting device according to claim 3, wherein the tool holder mounting device comprises one of a plurality of counterbore holes formed on the adhesive application surface of the spacer. 5. The tool holder mounting device according to claim 1, wherein the spacer has a notch at a position corresponding to a drive key protruding from an end surface of the spindle. 6. When mounting a tool holder in which a gap between the front end surface of the main spindle and the end surface of the gripping flange portion opposed thereto is smaller than a gap defined by an industrial standard, an end surface of the spacer for gripping the spacer. The opposite surface is ground by an amount corresponding to the amount obtained by subtracting the gap between the front end surface of the main shaft of the tool holder and the end surface of the gripping flange portion from the gap defined by the industrial standard to reduce the thickness of the spacer. 5. The tool holder mounting device according to claim 1, wherein the tool holder mounting device is reduced. 7. The method according to claim 1, wherein a thickness of a peripheral portion of a notch portion of the spacer facing an end face of the gripping flange portion is smaller than a thickness corresponding to the predetermined gap ± manufacturing error. Or the tool holder mounting device according to 6.