JPH0748324Y2 - Dustproof seal for tool chuck - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof seal used for preventing invasion of cutting chips, cutting oil, etc., into a tool chuck of various machine tools.

[0002]

2. Description of the Related Art When a cutting tool is attached to a rotary spindle of a machine tool, the shank portion of the tool is attached to the chuck barrel of the chuck main body, the taper collet chuck method uses a taper collet, and the needle roll lock chuck method uses a straight tool. It is usual that the collet is fitted through a collet and then tightened with a tightening nut from the outside to reduce the diameter of the collet and fix it tightly.

However, in the usual case, such a tool chuck portion is not provided with a sealing measure, so that fine chips and cutting oil enter the space between the collet and the tool and the chuck cylinder, and the clamp mechanism portion. This invasion lowers chucking accuracy and gripping force, lowers processing accuracy, shortens the life of the chuck, and may cause damage to the work piece or a serious accident due to removal of the tool.

Incidentally, in the past, a taper collet chuck method has been partially proposed, for example, with a sealing measure as shown in FIG. In the figure, 1
Is a chuck body, 2 is a taper collet inserted into the taper hole 1a of the body 1, and 3 is an outer ring body 3 via a bearing 4.
The tightening nut 5 connecting the a and the inner ring body 3b is a cutting tool, and is externally fitted to the inner ring body 3b of the tightening nut 3 on the shank portion 5a of the tool 5 in front of the front end of the collet 2. The small inner diameter portion 3c is formed, and the O-ring 6 fitted to the inner circumference of the small inner diameter portion 3a is configured to seal the gap with the shank portion 5a.

However, in the above proposed sealing means, the inner ring body 3b of the tightening nut 3 has a special structure having a small inner diameter portion 3c for fitting the O-ring 6, so that it is dedicated to the chuck device. There is no compatibility as a sealing means with other chuck devices, it is naturally not applicable to existing chuck devices, it cannot be used for tools with different shank diameters, and the manufacturing cost of tightening nuts is low. It was very expensive. Further, in terms of the sealing function, the shank portion 5a of the tool 5 and the inner ring body 3b are sealed, but the gap between the inner ring body 3b and the outer ring body 3a (usually about 0.1 mm) is sealed. Therefore, there is a problem that it is impossible to prevent the invasion of cutting chips and cutting oil from the gap into the chuck.

[0006]

In view of the above-mentioned circumstances, the present invention has compatibility between different chucking devices as a sealing means, is applicable to existing chucking devices, and has a certain degree of tooling. (EN) An inexpensive dustproof seal which can cope with a difference in shank diameter and can give a complete sealing effect to the inside of a chuck.

That is, the tool according to claim 1 of the present invention
For the dustproof seal for chucks, use the tool end on the annular end face on one end side.
Seal that comes into contact with the outer periphery of the tip of the nut
End face and the annular inner peripheral surface contacts the outer peripheral surface of the tool shank
It consists annular elastic body in which an axial sliding surface for the ring
Small form the minimum inner diameter of Jo inner peripheral surface than the outer diameter of the tool shank
And slip on the annular inner peripheral surface toward the tightening nut side.
One-way property with weak resistance but strong slip resistance to the other side
The non-slip part of is formed.

The dust-proof seal for a tool chuck according to a second aspect of the present invention has the configuration according to the first aspect, wherein the anti-slip portion has a saw-toothed concave-convex surface.

[0009] dustproof sealing tool chuck according to claim 3, wherein the non-slip portion thereof an inner diameter of the sealing end face
2. A taper surface which is larger than the inner diameter on the opposite side.
It has the configuration described in.

Further, in the dustproof seal for a tool chuck according to a fourth aspect, the sealing end surface is located near the outer periphery of the elastic body.
The structure according to any one of claims 1 to 3 comprising an annular lip portion integrally formed .

[0011]

The dustproof seal for a tool chuck of the present invention is made of an annular elastic body, so that it can be press-fitted and mounted on the shank portion of a tool having a shank diameter larger than its minimum inner diameter. Since the outer diameter of the dustproof seal can be arbitrarily set, a perfect seal can be obtained by joining the dustproof seal attached when chucking the tool to the front end face of the chuck so as to cover the entire gap. Can be given. Further, since the dust-proof seal mounted on the tool is in a state where the inner circumference is forcibly expanded due to the above-mentioned diameter difference, its elastic restoring force acts to always tighten the shank portion of the tool and Since the peripheral surface forms the non-slip portion, there is no fear of pulling out even during high-speed rotation during processing, and the above-mentioned perfect sealed state can be maintained.

Further in accordance with the present invention, one end of the dustproof seal
Side sealing end face is the end of the tool chuck tightening nut.
Abutting on the outer periphery of the end face so as to exert a sealing action
The tool shank and chuck body side
At the interface with the collet fitted in the chuck body.
Not only exerts a sealing effect, but also
For the interface with the tightening nut arranged on the outer peripheral side
The tool chuck can
Reliably exerts the sealing action on the tip side of the
Can be made.

Further in accordance with the present invention, the dustproof seal is formed.
The annular inner peripheral surface of the annular elastic body is the outer peripheral surface of the tool shank.
The sliding surface in the axial direction that comes into contact with the
Slip resistance to the nut side is weak, but slip to the opposite side
Since it forms a unidirectional non-slip part with strong resistance,
Fit the dustproof seal to the tool shank to secure the dustproof seal.
Smooth and easy when mounting on the tip side of the tightening nut
It can be moved and installed, and the dustproof seal
In the direction in which the tightening nut is pulled out from the tip side.
The stopper strongly prevents the stopper from coming off, and
Can be used stably regardless of high speed rotation
It

Moreover, according to the present invention, the dustproof seal is manufactured.
Slip that fits on the shank and contacts the outer surface of the shank
Hold the dustproof seal in place by the stop
Holds a dustproof seal on the tool chuck side
Because it does not require any special configuration to
It is very versatile.

Further, since the inner circumference of the dustproof seal can allow a considerable diameter expansion, it is possible to cope with a certain change in the tool shank diameter. The dustproof seal may be fitted on the tool before or after the tool is chucked.

The elastic body forming the dustproof seal is O
A variety of synthetic rubber and synthetic resin materials similar to those used for rings can be utilized.

It is preferable that the non-slip portion is formed by an uneven surface or a tapered surface. The former concave-convex surface is preferably composed of a plurality of concave-convex ridges along the circumferential direction in order to secure the sealing property. Especially, if each convex ridge cross section is a mountain shape that tilts forward when the tool is installed, Since the resistance against the movement to the blade is increased, the slip-out preventing action is further improved, and the backward movement is facilitated, so that the tool can be easily fitted from the blade portion side. For the same reason as above, the latter tapered surface is preferably tapered so that the inner diameter on the front end side becomes small when the tool is mounted. However, in a dustproof seal having a non-slip portion made of such a tapered surface, since the diameter expansion ratio of the inner circumference is naturally increased toward the front end side when the tool is mounted, the entire seal has a cross section along the radial direction. As a result, it is elastically deformed so as to be tilted and rotated about the rear end of the inner circumference, and the outer peripheral portion of the rear end surface of the seal is pressed against the front end surface of the chuck portion accordingly, so that the sealing performance is further improved.

Further, if an annular lip is provided on one end face of the dustproof seal, that is, near the outer periphery of the rear end face when the tool is fitted, the flexible lip part can be brought into close contact with the front end face of the chuck part at all times in a resilient pressure state. It is possible to improve the sealing property.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a dustproof seal 10A for a tool chuck according to the first embodiment. This dustproof seal 10A
Is an annular elastic body, and the outer peripheral surface 10a forms a taper surface having a large diameter on one end side (rear end when the tool is mounted), and the tapered surface along the outer peripheral edge of the one end surface of the large outer diameter. Is provided with an annular lip portion 11 as a sealing end surface projecting in the extension direction of the
The concave-convex anti-slip part is constituted by 2. Then, each convex strip 12 faces the one end side where the lip portion 11 is present and is tapered, and the other end side has a mountain shape inclined in the other end side so as to form a surface parallel to the end face direction. Has been formed.

FIG. 3 shows a chuck device 14 of the taper collet chuck type in which the cutting tool 13 is mounted. The chuck device 14 includes a chuck cylinder 17 having a threaded portion 16a on the outer peripheral surface and a tapered inner hole 17a on the front side of the chuck body 15, and the shank portion 13a of the cutting tool 13 is provided. The fitted taper collet 18 is inserted into the taper hole 17a, and the tightening nut 19 engaged with the collet 18 is externally screwed onto the chuck cylinder 17 to be tightened. The tool 13 is forcibly pressed into the inner depth side to be reduced in diameter, and the tool 13 is gripped by the collet 18 so as to be axially movable and relatively non-rotatable by the chuck cylinder 17 by tightening the shank portion 13a. An annular locking groove 18a is provided on the outer peripheral surface near the outer end of the collet 18, and the locking groove 18a is provided.
Since the inward flange portion 20 of the tightening nut 19 is engaged with the collet 18, the collet 18 is pulled out from the tapered hole 17a by loosening the nut 19. Further, as shown in FIG. 4, the tightening nut 19 has a chuck cylinder 17 on the inner surface.
Outer ring body 19a having a threaded portion 16b corresponding to the threaded portion 16a, and an inner ring having the inward flange portion 20 fitted to the inner circumference on the front side thereof via a ball bearing 21 so as to be relatively rotatable. And a body 19b, both ring bodies 19a,
The front end surface of 19b is set to be substantially flush.

Therefore, the shank portion 13a of the tool 13 is provided with the dustproof seal 10A having a minimum inner diameter d ₁ (see FIGS. 1 and 2) smaller than the shank diameter d ₂ on one end side of the large outer diameter. The tool 13 is press-fitted so as to face the rear end side. This dustproof seal 10A has a size such that the outer diameter, that is, the maximum diameter, at the tip of the lip portion 11 is larger than the inner diameter of the outer ring body 19a of the tightening nut 19 and smaller than the outer diameter. As shown in FIG. 4, the fitting position of the tool 13 is set so that the lip portion 11 makes elastic contact with the outer ring body 19a of the tightening nut 19 when the tool 13 is attached to the chuck device 14.

According to the above construction, at the front end of the chuck device 14, the gap 22a between the two annular members 19a and 19b of the tightening nut 19 and the interface 2 between the nut 19 and the collet 18 are provided.
2b, since the interface 22c between the shank portion 13a of the tool 13 and the collet 18 is entirely covered and sealed by the dustproof seal 10A, invasion of cutting chips and cutting oil into these gaps 22a and the interfaces 22b, 22c is completed. It is also prevented, and the reduction of chucking accuracy and gripping force due to the intrusion and the shortening of the life of each member and the entire device are avoided. As shown in FIG. 4, the dust-proof seal 10A is in a state in which the inner circumference is forcibly expanded so that the ridge 12 is crushed, and the elastic restoring force constantly tightens the shank portion 13a of the tool 13, and The ridge 12 has a chevron-shaped cross section that tilts forward, and the shank portion 13
Since the resistance against the movement in the front direction, that is, the removal direction is large with respect to a, there is no risk of the product coming off during cutting and a perfect sealed state is maintained.

FIG. 5 shows a needle roll lock chuck type chuck device 2 equipped with the same cutting tool 13 as described above.
3 is shown. The chuck device 23 includes a chuck body 24.
Has a thin-walled chuck cylinder 25 having a tapered outer peripheral surface on the front side thereof, and the shank portion 1 of the cutting tool 13 is provided.
The straight collet 26 with 3a fitted therein is inserted into the chuck cylinder 25 and tightened from the outside by the tightening nut 27 via the needle roller 28, whereby the chuck cylinder 25 is reduced in diameter and the collet 26 is tightened. Along with this, the collet 26 is reduced in diameter to tighten the shank portion 13a, so that the tool 13 is gripped by the chuck cylinder 25 so as not to be axially movable and relatively rotatable.

In the chuck device 23, however, as shown in the drawing, the shank portion 13a of the tool 13 is provided with the dust-proof seal 10A having a minimum inner diameter d ₁ smaller than the shank diameter d ₂ of which one end having a large outer diameter faces rearward. By press-fitting and attaching the lip portion 11a to the front end surface of the tightening nut 27 in a resilient manner, the nut 27 and the chuck cylinder 25 and the collet 26, as well as the collet 26 and the tool. The interface of the shank portion of 13 is covered with the seal 10A at the front end, so that a complete sealed state similar to the chuck device 14 of FIG. 3 is achieved and maintained.

FIG. 6 shows a dustproof seal 10B for a tool chuck according to the second embodiment. This dustproof seal 10B is made of an annular elastic body, and the outer peripheral surface 10a has a taper surface having a large diameter on one end side like the dustproof seal 10A of the first embodiment.
The inner peripheral surface 10 has an annular lip portion 11 protruding in the extension direction of the tapered surface along the outer peripheral edge of the one end surface having the large outer diameter.
b forms a tapered surface 29 in which one end side having a large outer diameter is similarly made larger in diameter than the other end side, and the tapered surface 29 constitutes a non-slip portion.

The dustproof seal 10B is similar to the dustproof seal 10A of the first embodiment in that the shank portion 13 of the tool 13 having a shank diameter d ₂ larger than the minimum inner diameter d ₁ thereof.
The taper collet chuck type chucking device 1 shown in FIG.
4 and FIG. 5, when the tool 13 is attached to the chuck device 23 of the needle roll lock chuck system, the lip portion 11 is elastically brought into contact with the front end surfaces of the tightening nuts 19 and 27 to thereby make the front end of the chuck portion. Completely seal the face. In this case, as shown in FIG. 7, the dustproof seal 10B
When the seal 10B is fitted to the shank portion 13a of the tool 13, the seal 10B has a larger diameter expansion ratio toward the front end side due to the difference in diameter. The outer periphery on the rear end side is elastically deformed so as to protrude rearward, and the lip portion 11 is strongly pressed against the tightening nut 19 (27) with this deformation, and the sealing performance is further improved.

The anti-slip portion on the inner peripheral surface of the dustproof seal of the present invention may have a shape other than that of the first and second embodiments. Needless to say, the structure of the chuck portion and the type of tool to which the dustproof seal is applied are not limited to those illustrated.

[0028]

[Effects peculiar to the invention] With the dustproof seal for a tool chuck according to the present invention, the front end face of the chuck part can be completely sealed by simply fitting it on the shank part of the tool, and even during processing by the tool. There is no danger of pulling out and maintaining a perfect sealed state, thus preventing chucking accuracy and tool gripping force from decreasing due to invasion of cutting chips and cutting oil into the chuck, and further shortening the life of each part of the chuck device and the whole. As a result, the machining accuracy is improved, and damage to the work piece or a serious accident due to the tool coming out can be avoided. Moreover,
This dust-proof seal can be used for different chuck devices and tools, can be applied to existing chuck devices without any problems, and can also cope with differences in tool shank diameter to some extent.
Further, there is an advantage that it can be mass-produced easily by using a molding die and can be provided at a very low cost.

Further in accordance with the present invention, the tool shank and chuck
Collet that is fitted to the chuck body side or the chuck body.
If it only exerts a sealing effect on the interface with the
First, the chuck body and the tightening nuts arranged on the outer peripheral side of the chuck body.
Will also exert a sealing effect on the interface with the
Therefore, the sealing action on the tip side of the tool chuck is applied to the entire surface.
It can be reliably exerted over a period of time.

Further , according to the present invention, the dustproof seal is used as a tool.
Fit the shank and attach the dustproof seal to the end of the tightening nut.
When mounting on the surface side, move smoothly and easily
It is also possible to attach the dustproof seal to the end of the tightening nut.
Strong in the direction of slipping out from the end face side due to the anti-slip part
To prevent the tool from coming off and prevent the tool chuck from rotating at high speed.
However, it can be used stably.

Moreover, according to the present invention, the dustproof seal is manufactured.
Slip that fits on the shank and contacts the outer surface of the shank
Hold the dustproof seal in place by the stop
Holds a dustproof seal on the tool chuck side
Because it does not require any special configuration to
It is very versatile.

Further, according to the dustproof seals of claims 2 and 3 of the present invention, it is possible to surely prevent the tool from slipping on the shank portion, and in particular, the dustproof seal of claim 3 has an advantage that the sealing property is further improved. is there. Further, according to the dustproof seal of the fourth aspect of the present invention, there is an advantage that the annular lip portion is elastically contacted with the front end surface of the chuck portion, whereby more perfect sealing performance can be secured.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a dustproof seal according to a first embodiment of the present invention,

FIG. 2 is a front view of the same,

FIG. 3 is a longitudinal sectional view showing an example of a chuck device to which the dustproof seal is applied,

FIG. 4 is an enlarged view of an imaginary line circle IV of FIG.

FIG. 5 is a vertical cross-sectional view showing another example of a chuck device to which the dustproof seal is applied,

FIG. 6 is a vertical sectional view of a dustproof seal according to a second embodiment of the present invention,

FIG. 7 is a longitudinal sectional view of a main part of a chuck device to which the dustproof seal is applied,

FIG. 8 is a vertical cross-sectional view of a chuck device provided with a conventional sealing means.

[Explanation of symbols]

10A, 10B ... Dustproof seal, 10b ... Inner peripheral surface, 11 ...
Sealing the end face (lip portion), 12 ... slip portions (ridge), 13 ... cutting tool, 13a ... shank, 29 ... tapered surface, d ₁ ... minimum inner diameter, d ₂ ... Shank Diameter.

Claims (4)

[Scope of utility model registration request] 1. An annular end surface on one end side for tightening a tool chuck
A sealing end face that abuts near the outer periphery of the nut tip surface,
The axial inner surface of the tool shank comes into contact with the outer surface of the tool shank.
The inner diameter of the annular inner peripheral surface is smaller than the outer diameter of the tool shank , and
The slip resistance to the tightening nut side on the annular inner peripheral surface is weak
However, it is a one-way anti-slip with strong slip resistance to the opposite side.
Dust-proof seal for tool chucks that forms a part . 2. The dust-proof seal for a tool chuck according to claim 1, wherein the non-slip portion is a saw-toothed concave-convex surface. 3. The non-slip portion has an inner diameter on the end face side for sealing.
The dust-proof seal for a tool chuck according to claim 1, comprising a tapered surface having a larger inner diameter than the opposite side . 4. The sealing end surface is located near the outer periphery of the elastic body.
4. An annular lip portion integrally formed with the
A dustproof seal for a tool chuck according to any one of 1.