JP2002254271A - Holder for cleaning main shaft end surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to securely clean off dust such as cut-off particles, etc., stuck to the tip surface of a main shaft of a machine tool, over the whole surface thereof. SOLUTION: A cleaning holder 10 is constituted of a taper shank part 21 with a rotating body 24 rotatably provided around the shaft of the taper shank part 21 opposite to a clearance d formed between the tip surface 121 of the main shaft 12 and the rear tip surface 222 of a flange part 22, and an air passage 241 is shaped in a ring form along the inner circumferential surface of the rotating body 24. At the rotating body 24, a plurality of air-injecting holes 241 passing through and opened from the air passage 241 to the clearance d so as to be tilted at a prescribed angle toward the circumferential direction with regard to the radial direction of the rotating body 24 are formed in the circumferential direction spaced at prescribed intervals, the body 24 is rotated by the injecting force of the air injected from respective injecting holes 242 thereof, and the air injected from the air injecting holes 242 of the rotating body 24 is injected toward the clearance d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle end face cleaning holder used for cleaning a tip end face of a spindle in a machine tool such as a milling machine or a machining center, and more particularly, to a holder attached to the spindle while being attached to the tip end face of the spindle. The present invention relates to a cleaning holder for cleaning an end face of a spindle by blowing air.

[0002]

2. Description of the Related Art In a machine tool such as a machining center, a cleaning holder shown in FIG. 1 is known as a cleaning holder for removing dust such as cutting chips adhering to an end face of a spindle. In FIG. 1, reference numeral 1 denotes a main spindle head of a machine tool, 2 denotes a main spindle rotatably provided on the main spindle head 1,
The main shaft 2 is formed with a tapered tool fitting hole 2B whose diameter decreases toward the rear from the distal end surface 2A.

In FIG. 1, reference numeral 3 denotes a cleaning holder for cleaning the tip end surface 2A of the main shaft 2. The cleaning holder 3 is a tapered shank portion 3A fitted into a tool fitting hole 2B of the main shaft 2. A gripping flange 3B provided at the large-diameter end of the tapered shank 3A; and a pull stud 4 screwed onto the rear end of the tapered shank 3A with its axis aligned.
It has. In addition, the axis of the cleaning holder 3 includes:
An air passage 3C is formed from the rear end of the tapered shank portion 3A to the flange portion 3B. Further, a connecting corner portion between the rear end face 3B1 of the flange portion 3B and the tapered shank portion 3A from the flange portion 3B side end of the air passage 3C. A plurality of air ejection passages 3E are formed radially at predetermined angular intervals so as to penetrate the main shaft 2 and open toward the distal end surface 2A of the main shaft 2. In addition, an air passage 3C is provided at the axis of the pull stud 4.
An air passage 4A communicating with the air passage is formed.

When the tip surface 2A of the spindle 2 is to be cleaned using the cleaning holder 3 configured as described above, first, the taper shank 3A of the cleaning holder 3 is inserted into the tool fitting hole 2B of the spindle 2. The cleaning holder 3 is attached to the main shaft 2 by fitting and pulling the pull stud 4 by a tension mechanism (not shown). At this time, the tip surface 2A of the main shaft 2 and the flange portion 3B
A predetermined gap d is generated between the rear end face 3B1 and the rear end face 3B1. In this state, when compressed air is supplied from the rear of the main shaft 2, the compressed air passes through the air passage 4A of the pull stud 4 and the air passage 3C of the cleaning holder 3 as shown by arrows in FIG. Eject passage 3E
From the main shaft 2 toward the tip end surface 2A. As a result, dusts such as cutting chips adhering to the front end face 2A of the main shaft 2 are blown off and discharged outward from the gap d. Thereby, the tip surface 2A of the main shaft 2 can be cleaned.

[0005]

However, in the conventional cleaning holder as described above, since the air ejection passage 3E is radially provided at a predetermined angular interval with respect to the front end surface 2A of the main shaft 2, the main shaft 2 is not provided with the air. The ejection direction of the air ejected from each air ejection passage 3E to the end surface 2A is fixed. For this reason, portions where the jet air does not come into contact with the tip end surface 2A of the main shaft 2 may be generated, and there is a problem that these portions cannot be cleaned, particularly dust that has adhered together with the cutting oil cannot be cleaned. As a result, when the tool holder is mounted on the main spindle 2 while dust such as cutting chips remains on the front end face 2A of the main spindle 2, the contact between the front end face 2A of the main spindle 2 and the rear end face of the flange of the tool holder is performed. However, there has been a problem that the operability is impaired, the runout accuracy of the tool holder at the time of coupling is deteriorated, the coupling rigidity between the tool holder and the main shaft is reduced, and the heavy cutting is adversely affected.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to reliably remove dusts such as cuttings adhering to the front end surface of a main shaft of a machine tool over the entire front end surface. Another object of the present invention is to provide a spindle end face cleaning holder.

[0007]

According to the first aspect of the present invention, there is provided a cleaning holder for cleaning a front end surface of a main spindle of a machine tool in a state where the main spindle is mounted on the main spindle. And a taper shank portion that is fitted to a tapered tool fitting hole whose diameter decreases toward the rear from the tip end surface of the main shaft, and provided at a large-diameter end of the taper shank portion. A gripping flange portion having a rear end surface parallel to the front end surface of the main shaft, and an outer periphery of the tapered shank portion facing a gap formed between the front end surface of the main shaft and the rear end surface of the flange portion. A rotatable member provided rotatably around the outer peripheral portion of the portion, and an air passage formed in a ring shape at least one of an inner peripheral surface of the rotatable member and an outer peripheral portion of the tapered shank portion facing the inner peripheral surface. Formed on the rotating body. A plurality of air injection holes are formed at predetermined intervals in the circumferential direction so as to penetrate and open from the air passage toward the gap so as to be inclined at a predetermined angle in the circumferential direction with respect to the radial direction of the rotating body. The taper shank portion is provided with an air supply passage for supplying compressed air to the air passage.

According to a second aspect of the present invention, in the holder for cleaning the end face of the spindle according to the first aspect, the rotating body is rotated by the jet thrust of the air jetted from each of the air jet holes, and the air of the rotary body is rotated. The air blown from the injection hole is blown from the inside toward the outside toward the gap. According to a third aspect of the present invention, in the spindle end face cleaning holder according to the first aspect, the flange portion is detachably provided at a large-diameter end of the taper shank portion, and the flange portion connects the rotating body to the taper shank. It is characterized in that it is rotatably supported by a part. According to a fourth aspect of the present invention, in the spindle end surface cleaning holder according to the first aspect, a spacer for adjusting the gap is provided on a rear end surface of the flange portion. The invention of claim 5 is the invention of claim 1
In the spindle end face cleaning holder described above, the rotating body has a cylindrical shape, and the rotating body is rotatable via a bearing on a cylindrical shaft portion provided with an axis aligned with the large diameter end of the tapered shank portion. And a seal ring for preventing air leakage from the air passage is provided on one of the inner peripheral surface of the rotating body and the outer peripheral surface of the cylindrical shaft portion. The invention according to claim 6 is characterized in that the spindle end face cleaning holder according to claim 1 is configured such that the compressed air is supplied to the air supply passage through the inside of the spindle. According to a seventh aspect of the present invention, in the spindle end surface cleaning holder according to the first aspect, an air supply adapter is rotatably provided on a cylindrical shaft portion protruding from a front end surface of the flange portion. The tapered shank portion is configured to be supplied to an air supply passage through an air passage provided in a cylindrical shaft portion of the flange portion. According to an eighth aspect of the present invention, in the spindle end face cleaning holder according to the seventh aspect, an on-off valve is provided on the air supply adapter, and the on-off valve is provided on the spindle head when the tapered shank portion is mounted on the spindle. The compressed air is supplied from the air supply adapter to the air passage by connecting to the air supply port and opening the on-off valve.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a vertical sectional side view of the spindle end face cleaning holder according to the first embodiment of the present invention, and FIG. 3 is a cross-sectional plan view taken along line AA of FIG.

In FIG. 2, reference numeral 10 denotes a main spindle head of a machine tool such as a milling machine, and 12 denotes a main spindle rotatably supported by the main spindle head 10. A tapered tool fitting hole 122 having a smaller diameter is formed.

In FIG. 2, reference numeral 20 denotes a cleaning holder for cleaning the front end surface 121 of the main shaft 12. The cleaning holder 20 includes a tapered shank portion 21 and a flange portion 2.
2, a pull stud 23, and a rotating body 24. The taper shank portion 21 is provided with a tool fitting hole 122 of the spindle 12.
At the center of the large-diameter end of the tapered shank portion 21, as shown in FIG. 2, a cylindrical shaft portion 211 for attaching the rotating body 24 projects in line with the axis. Further, a male screw portion 2 for detachably attaching the flange portion 22 is provided on the distal end surface of the cylindrical shaft portion 211.
12 are provided so as to be aligned with the axis. An air supply passage 213 extending from the rear end of the tapered shank portion 21 to the cylindrical shaft portion 211 is provided at the axial center of the tapered shank portion 21.
In addition, a communication path 214 that penetrates the cylindrical shaft portion 211 in the radial direction from the air supply path 213 and opens on the outer periphery of the cylindrical shaft portion 211 is formed in the cylindrical shaft portion 211 in the circumferential direction. Are formed at a distance from each other.

The flange portion 22 is provided with a cleaning holder 20.
2 is formed into a grip portion when the tool is inserted into and removed from the tool fitting hole 122 of the spindle 12, and has a thick disk shape as shown in FIG. A trapezoidal groove 221 with which the arm is engaged is formed in a ring shape. In addition, the rear end surface 222 of the flange portion 22 facing the front end surface 121 of the main shaft 12 has a cylindrical shape that supports the rotating body 24 rotatably supported by the cylindrical shaft portion 211 of the tapered shank portion 21 so as not to fall off. A concave portion 223 is formed concentrically, and a female screw portion 224 for coupling with the male screw portion 212 is formed at the center of the cylindrical concave portion 223. Therefore, by screwing the female screw portion 224 to the male screw portion 212, the flange portion 22 can be integrally fixed to the large-diameter end of the tapered shank portion 21. In addition, the taper shank portion 21 is
When the cleaning holder 20 is mounted on the main shaft 12 by being fitted in the second tool fitting hole 122, the front end surface 121 of the main shaft 12 and the rear end surface 222 of the flange portion 22 facing the main shaft 12 are opposed to each other. A constant gap d is formed between them.

The pull stud 23 is used when the tapered shank portion 21 is inserted into and removed from the tool fitting hole 122 of the main shaft 12. As shown in FIG. Matched and screwed. Also,
An air passage 231 communicating with an air supply passage 213 of the tapered shank portion 21 is provided at a shaft center of the pull stud 23.
Are formed.

As shown in FIG. 2, the rotating body 24 has a cylindrical shape having an inner diameter corresponding to the outer diameter of the cylindrical shaft portion 211 of the tapered shank portion 21, and the inner circumferential surface of the rotating body 24 has An air passage 241 communicating with the communication passage 214 of the cylindrical shaft portion 211 is formed in a ring shape. Also,
As shown in FIG. 2 and FIG.
A plurality of air injection holes 242 penetrating and opening from the air passage 241 toward the gap d so as to be inclined at a predetermined angle in the circumferential direction with respect to the radial direction of No. 4 at predetermined intervals in the circumferential direction. Is formed.

The rotating body 24 having such a structure is rotatably supported on the cylindrical shaft portion 211 via a bearing 243, and is fixed by the flange portion 22 fixed to the large-diameter end of the tapered shank portion 21. Are supported so as not to fall off from the cylindrical shaft portion 211. Further, a seal ring 25 such as an O-ring for preventing air from leaking from the air passage 241 is provided on the inner peripheral surface of the rotating body 24. The rotating body 24 supported in this manner is rotated about the cylindrical shaft portion 211 by the jet thrust of the air jetted from each air jetting hole 242 and jetted out from the air jetting hole 242 of the rotary body 24. The air is blown from the inside toward the outside with respect to the gap d.

The cleaning holder 20 constructed as described above
When the tip surface 121 of the main shaft 12 is cleaned by using the main shaft 12, first, the taper shank portion 21 of the cleaning holder 20 is
The cleaning holder 20 is mounted on the main shaft 12 by fitting the pull stud 23 with a pulling mechanism (not shown). At this time, a predetermined gap d is generated between the front end surface 121 of the main shaft 12 and the rear end surface 222 of the flange portion 22. In this state, when compressed air is supplied from behind the main shaft 12, the compressed air passes through the air passage 231 of the pull stud 23 and the air supply passage 213 of the tapered shank portion 21 as shown by arrows in FIG. The air is ejected from the air ejection passage 242 toward the gap d. Accordingly, the rotating body 24 is rotated about the cylindrical shaft portion 211 by the jet thrust of the air jetted from each of the air jet holes 242. At the same time, the air ejected from the air injection holes 242 of the rotating body 24 flows out from the inside to the outside in the gap d, so that the dust and the gap d attached to the tip end surface 121 of the main shaft 12
Dust mixed with the cutting oil that stays in between is blown out of the gap d. Thereby, the tip surface 121 of the main shaft 12 can be cleaned.

According to the cleaning holder 20 according to the present embodiment, the tip surface 121 of the main shaft 12 is rotated while rotating the rotating body 24 by the jet thrust of the air ejected from the air injection holes 242 of the rotating body 24. The air is jetted toward the gap d formed between the rear end surface 222 of the flange portion 22 and the rear end face 222 of the flange portion 22, so that a uniform air jet required for cleaning is generated in the entire area of the gap. As a result, dust such as swarf adhering to the spindle tip surface 121 can be reliably cleaned over the entire tip surface. In addition, since air can be intermittently ejected while rotating, dust such as cutting chips can be reliably removed.

Further, according to the present embodiment, the rotating body 24
Is a bearing 24 on the cylindrical shaft 211 of the tapered shank 21.
3 so as to be rotatable, the rotating body 24
Can be smoothly rotated. Moreover, by providing the flange portion 22 so as to be separable at the large-diameter end of the tapered shank portion 21, the tapered shank portion 2 of the rotating body 24 is provided.
1 can be easily assembled, and the rotating body 24 and the air injection holes 242 can be easily cleaned.
Further, by providing the air supply passage 213 and the air passage 231 which open to the rear of the main shaft 12 in the taper shank portion 21 and the pull stud 23, the air supply source incorporated in the main shaft 12 can be used for cleaning the end surface of the main shaft. it can.

FIG. 4 is a vertical sectional side view showing a second embodiment of the spindle end face cleaning holder according to the present invention. In FIG. 4, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. That is, as is apparent from FIG. 4, the thickness of the flange portion 22 is made thinner than that shown in FIG. 2, and accordingly, the flange portion 22 facing the distal end surface 121 of the main shaft 12 is correspondingly formed.
2 is different from FIG. 2 in that a donut-shaped spacer 30 for adjusting the gap d is provided on the rear end face 222 of the first embodiment. The spacer 30 is fixed to the flange 22 by screws 31 or the like. Further, by changing the thickness of the spacer 30, the front end surface 121 of the main shaft 12 and the rear end surface 222 of the flange portion 22 are formed.
To adjust the gap d formed between
Can be made a gap d that can generate an optimal air jet flow required for cleaning the air.

According to the second embodiment, even if the gap d changes due to a difference in the length of the tapered shank portion 21 with respect to the tool fitting hole 122 of the main shaft 12, the tip of the main shaft 12 can be changed. The gap d formed between the surface 121 and the rear end surface 222 of the flange portion 22 can be adjusted by the spacer 30 to an optimum value required for cleaning the main shaft front end surface 121. Also, in the second embodiment, the same operation and effect as those in the first embodiment can be obtained.

FIG. 5 is a longitudinal sectional side view showing a third embodiment of the spindle end face cleaning holder according to the present invention. In FIG. 5, the same components as those of FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 5, the spindle end surface cleaning holder 20 according to the third embodiment includes a cylindrical shaft portion 225 protruding from the front end surface of the flange portion 22 so as to be aligned with the axis.
The tapered shank portion 2 is provided at the axis of the cylindrical shaft portion 225.
The air passage 226 communicating with the first air supply passage 213
And a cylindrical shaft 225 communicating with the air passage 226.
A plurality of air passages 227 extending in the radial direction are formed.

An air supply adapter 26 is rotatably mounted on the outer periphery of the cylindrical shaft portion 225 via a bearing 261.
An open / close valve 27 for supplying compressed air to the cleaning holder 20 via an air supply adapter 26 is provided on one side of the cleaning holder 20. The open / close valve 27 is provided with the air supply adapter 2.
6, a valve housing 271, which is fixed to one side of the valve housing 27,
1, a valve body 272 fitted slidably in a direction parallel to the axis of the tapered shank portion 21 and a spring member 273 for urging the valve body 272 in the closing direction.
Is stopped by a pin 274 protruding from the air supply adapter 26. When the cleaning holder 20 is mounted on the spindle 12, the valve body 272 is
Is connected to the air supply port 101 provided at the bottom. The opening and closing valve 27 and the air passage 227 of the cylindrical shaft 225 are configured to communicate with each other by an air passage 262 formed in the air supply adapter 26.

In the spindle end face cleaning holder according to the third embodiment as described above, when the cleaning holder 20 is mounted on the spindle 12, the valve body 272 of the opening / closing valve 27 is connected to the air supply port 101 of the spindle head 10. Joined to. Accordingly, the valve body 272 slides against the spring member 273, and the on-off valve 27 opens. Accordingly, the compressed air from the air supply port 101 is supplied to the on-off valve 27, the air passage 262, the air passage 227, the air passage 226, and the air supply passage 213.
Is supplied to the rotating body 24 through the
While rotating the rotating body 24, the tip surface 121 of the main shaft 12 is rotated.
Air is blown toward a gap d formed between the rear end surface 222 of the flange portion 22 and the flange portion 22. Thereby, the tip surface 121 of the main shaft 12 can be cleaned.

According to the third embodiment as described above,
By assembling the air supply adapter 26 and the opening / closing valve 27 to the cleaning holder 20, it is possible to clean the front end surface of the main shaft even for the main shaft having no air supply source on the main shaft 12. Also, in the third embodiment, the same operation and effect as those in the first embodiment can be obtained.

[0025]

As described above, according to the spindle end face cleaning holder of the present invention, the rotating body is rotated by the jet thrust of the air ejected from the air injection hole of the rotating body, and the front end face of the spindle and the rear portion of the flange are rotated. Since the air is jetted toward the gap formed between the end face and the end face, it is possible to generate a uniform jet of air required for cleaning over the entire area of the gap. Dust, such as cuttings, adhering to the surface can be reliably cleaned over the entire tip surface.

Further, according to the present invention, since the rotating body is rotatably supported by the cylindrical shaft portion of the tapered shank via the bearing, the rotating body can be smoothly rotated. In addition, since the flange portion is detachably provided at the large-diameter end of the tapered shank portion, the assembly of the rotating body to the tapered shank portion is simplified, and the rotating body and the air injection holes are easily cleaned. be able to. Furthermore, according to the present invention, by providing the tapered shank portion and the pull stud with an air supply path that opens to the rear of the spindle, the air supply source incorporated in the spindle can be used for cleaning the end face of the spindle.

According to the present invention, since the spacer for adjusting the clearance is provided on the rear end face of the flange portion facing the front end face of the spindle, the gap formed between the front end face of the spindle and the rear end face of the flange portion is provided. Can be adjusted to the optimum value required for cleaning the front end surface of the spindle. Further, according to the present invention, by assembling the air supply adapter and the on-off valve to the cleaning holder, it is possible to clean the front end surface of the main spindle even for the main spindle having no air supply source.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a conventional spindle end surface cleaning holder.

FIG. 2 is a longitudinal sectional side view of a spindle end face cleaning holder according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional plan view taken along the line AA of FIG. 2;

FIG. 4 is a longitudinal sectional side view showing a second embodiment of a spindle end surface cleaning holder according to the present invention.

FIG. 5 is a vertical sectional side view showing a third embodiment of a spindle end surface cleaning holder according to the present invention.

[Explanation of symbols]

 Reference Signs List 10 spindle head 101 air supply port 12 spindle 121 spindle tip surface 122 tool fitting hole 20 cleaning holder 21 taper shank portion 211 cylindrical shaft portion 212 male screw portion 213 air supply path 22 flange portion 222 rear end surface 223 cylindrical recess 224 female screw Part 226, 227 Air passage 23 Pull stud 231 Air passage 24 Rotating body 241 Air passage 242 Air injection hole 243 Bearing 25 Seal ring 26 Air supply adapter 261 Bearing 27 Open / close valve 30 Spacer

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Nobuyuki Matsuura 1-6-153 Motomachi, Higashi-Osaka-shi, Osaka F-term in Niken Kousaku Co., Ltd. (reference) 3C011 BB13 BB15

Claims (8)

[Claims] 1. A cleaning holder for cleaning a front end surface of a main spindle while being mounted on a main spindle of a machine tool, wherein the main spindle has a tapered shape whose diameter decreases as going rearward from the front end surface of the main spindle. A tapered shank portion to be fitted into the tool fitting hole; a gripping flange portion provided at a large-diameter end of the tapered shank portion and having a rear end surface parallel to a front end surface of the main shaft; A rotating body provided at an outer peripheral portion of the tapered shank portion facing a gap formed between a front end surface and a rear end surface of the flange portion so as to be rotatable around the outer peripheral portion; An air passage is formed in a ring shape in at least one of a surface and an outer peripheral portion of the tapered shank portion facing the inner peripheral surface. Said air to be inclined at an angle A plurality of air injection holes that penetrate and open from the passage toward the gap are formed at predetermined intervals in the circumferential direction, and the taper shank portion has an air supply passage for supplying compressed air to the air passage. A spindle end surface cleaning holder, characterized in that: 2. The rotating body is rotated by a jet thrust of air ejected from each of the air ejection holes,
2. The spindle end face cleaning holder according to claim 1, wherein air ejected from an air ejection hole of the rotating body is blown toward the gap from inside to outside. 3. The tapered shank portion according to claim 3, wherein the flange portion is detachably provided at a large-diameter end of the tapered shank portion, and the flange portion rotatably supports the rotating body on the tapered shank portion. 2. A spindle end surface cleaning holder according to claim 1. 4. The spindle end surface cleaning holder according to claim 1, wherein a spacer for adjusting the gap is provided on a rear end surface of the flange portion. 5. The rotating body has a cylindrical shape, and the rotating body is rotatably supported via a bearing on a cylindrical shaft portion provided at the large-diameter side end of the tapered shank portion so as to coincide with the axis thereof. 2. A main shaft end surface cleaning device according to claim 1, wherein a seal ring for preventing air leakage from the air passage is provided on one of an inner peripheral surface of the rotating body and an outer peripheral surface of the cylindrical shaft portion. holder. 6. The spindle end face cleaning holder according to claim 1, wherein the compressed air is supplied to the air supply passage through the inside of the spindle. 7. An air supply adapter is rotatably provided on a cylindrical shaft protruding from a front end surface of the flange, and the air supply adapter passes through an air passage provided on the cylindrical shaft of the flange. The spindle end surface cleaning holder according to claim 1, wherein the holder is configured to be supplied to an air supply path of the taper shank portion. 8. An on-off valve is provided on the air supply adapter, and the on-off valve is connected to an air supply port provided on the spindle head when the taper shank portion is mounted on the spindle, and the on-off valve is opened to compress the taper shank. 8. The holder according to claim 7, wherein air is supplied to the air passage from an air supply adapter.