JPH0719701Y2 - Chuck - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION In the present invention, an oil flow passage communicating with a chuck cylinder is formed in a chuck body, and a tool with an oil hole is attached to the chuck cylinder through a collet.
The present invention relates to a chuck in which a hollow tool base end positioning bolt is supported on the rear side of a tool by a nut-shaped bolt support body that is screwed into the tool.

[0002]

2. Description of the Prior Art When using this type of chuck,
The straight shank of the tool at the base end side is fitted into the chuck cylinder via the collet, and the base end of the tool is positioned at the predetermined position by the tool base end positioning bolt supported by the bolt support. The taper shank portion of the chuck body is fitted into the spindle of the machine tool while the externally fitted tightening rotary cylinder is rotated in the tightening direction to hold and fix the tool via the collet. For example, in the case of the center oil supply type chuck, the cutting oil is introduced from the oil supply pipe in the main shaft into the oil flow passage through the taper shank portion, and is supplied to the oil hole of the tool from this oil flow passage. . In the case of the end face oil supply type, the end face of the manipulator gripping part between the taper shank part and the chuck cylinder part penetrates through the inside to supply oil to the oil flow passage. Oil is supplied to the oil flow passage of the chuck body through an oil passage of a non-rotational supporting member that rotatably supports.

[Problems to be solved by the device]

In the conventional chuck, since there is no means for positively sealing the region extending from the inner peripheral surface of the chuck body to the gripping portion of the tool, cutting oil is supplied from the oil flow passage of the chuck body to the tool. When the oil is supplied to the oil hole of the chuck body, the clearance between the inner peripheral surface of the chuck body, especially the clearance formed on the inner peripheral surface and the chuck groove, and the clearance between the bolt support and the clearance between the bolt support and the collet. However, there is a problem that cutting oil leaks to the outside through a gap between screwed portions between the bolt support and the tool base end positioning bolt, and further through a gap between the collet and the outer peripheral surface of the base end portion of the tool.

In view of the above problems, the present invention positively seals the region from the inner peripheral surface of the chuck body to the gripping portion of the tool, and allows the cutting oil to flow from the oil flow passage into each of the gaps as described above. It is an object of the present invention to provide a chuck that does not leak to the outside through the chuck.

[0005]

Means for Solving the Problems The present invention according to claim 1, Chi
An oil flow passage 5 communicating with the chuck cylinder portion 4 is provided on the backpack body 1.
Oil is formed on the chuck cylinder 4 through the collet 10.
Attach the tool T with hole 9 and place it behind the tool T.
Screw the hollow tool base end positioning bolt 13 into this
Of a nut-shaped bolt support 11
In the back of the bolt support body 11, the back end of the jack is in contact with the rear end portion of the bolt support body 11 and the outer peripheral surface is in contact with the inner peripheral surface 1a of the chuck body 1 and is formed in a substantially L-shaped cross section.
The ring-shaped first oil-tight packing 15 is provided, and the tip is in contact with the base end face of the tool T and the rear end is the tip of the bolt support 11 between the bolt support 11 and the base end of the tool T. It is characterized in that a ring-shaped second oil-tight packing 16 formed in a substantially U-shaped cross section in contact with the surface is provided.

According to a second aspect , the chuck body 1 is chucked.
Forming an oil flow passage 5 communicating with the cylinder portion 4,
4 to the tool T with the oil hole 9 through the collet 10
Along with mounting, a hollow tool base end position behind the tool T
A nut-shaped bolt support for screwing the deciding bolt 13 into the bolt.
In a chuck supported by a holding body 11, a rear end of the bolt support body 11 has a substantially L-shaped cross section whose front end contacts the rear end portion of the bolt support body 11 and whose outer peripheral surface contacts the inner peripheral surface 1a of the chuck body 1. The ring-shaped first oil-tight packing 15 formed on the upper surface of the tool T is disposed between the bolt support 11 and the base end portion of the tool T. Sectional inward contact with the tip surface of the support 11
A ring-shaped second oil-tight packing 26 formed in a box shape .
Is provided.

[0007]

[Action] pressure of the cutting oil introduced into the oil passage 5 from the outside of the chuck body 1, to the contact oil level of the first oil-tight packing 15, on its contact oil level throughout the principle of so-called Pascal <br The outer peripheral surface of the first oil-tight packing 15 is pressed against the inner peripheral surface 1a of the chuck body 1 so as to be in close contact, and the tip end of the first oil-tight packing 15 is located at the rear end portion of the bolt support 11. The inner peripheral surface 1 of the chuck body 1
The gap between a and the bolt support 11 is sealed. This place
The first oil-tight packing 15 is shaped like an L-shaped cross section.
Since it is made of O-ring and rectangular cross section
Compared to the ring, the oil contact area is wider and the char
Contact surface with the inner peripheral surface 1a of the rack body and the rear end of the bolt support body
The product becomes wider. Therefore, the pressure of the cutting oil is
Effectively acts on the oil-tight packing 15, and the packing 15
The outer peripheral surface and the tip of the inner surface of the chuck body 1a and
Make sure that the bolt supports are firmly attached to the rear ends of the bolt supports.
It is possible to obtain a very good sealing effect by
Together, this first oil-tight packing 15 is securely held in place
It does not move unexpectedly. In addition, the cutting oil on the side of the first oil-tight packing 15 passes through a gap between the screw support portion 11 and the tool base end positioning bolt 13 in the threaded portion 12 and the like, and is between the bolt support body 11 and the tool T base end portion. When entering, the tip of the second oil-tight packing 16 is on the base end surface of the tool T or the tip inner peripheral surface of the second oil-tight packing 26 is on the outer peripheral surface of the tool T due to the Pascal principle. closely wear, also closely wear on the tip surface of the rear end bolt support 11 of the second oil-tight packing 16 or 26, whereby the bolt support 11
The gap between the collet 10 and the collet 10, and the gap between the collet 10 and the base end portion of the tool T are sealed. In this case,
2 Oil-tight packing 16 or 26 has a generally U-shaped cross section
Since it is formed on this packing 16 or 26
Due to the pressure of the cutting oil acting on the U-shaped opening, this U-shaped
The front and rear ends of the shaped opening extend over the tip surface of the bolt support 11.
And the opposite direction to the base end surface or the outer peripheral surface of the tool T, respectively.
It is pressed against and firmly adheres, which makes it extremely
A good sealing effect can be obtained. Therefore, the oil flow passage 5 is completely oil-tightly sealed to the outside in a region extending from the inner peripheral surface 1a of the chuck body 1 to the grip portion of the tool T.

[0008]

EXAMPLES Examples will be described with reference to the drawings.
1 is a vertical sectional view of a center oil supply type chuck according to an embodiment of the present invention, and FIG. 2 is a horizontal sectional view thereof. In these drawings, reference numeral 1 denotes a chuck main body, which has a taper shank portion 2, a manipulator gripping portion 3 and a chuck cylinder portion 4. Inside the chuck main body 1, an oil flow passage 5 is provided over its entire length.
Are formed concentrically. Reference numeral 6 denotes a tightening rotary cylinder that is externally fitted to the chuck cylinder portion 4, and has a tapered inner peripheral surface 6a corresponding to the tapered outer peripheral surface 4a of the chuck cylinder portion 4. A large number of needle rollers 7 that revolve around the outer peripheral surface 4a of the chuck cylinder 4 in a spiral shape are interposed between and.

A plurality of chuck grooves 8 having a cross-sectional shape as shown in FIG. 2 and extending in the axial direction of the chuck body 1 are arranged on the inner peripheral surface of the chuck cylindrical portion 4 at equal intervals in the circumferential direction. The straight shank portion s of the tool T having the oil hole 9 is fitted into the chuck cylinder portion 4 via the split collet 10. Behind the tool T, a tool base end positioning bolt 13 having a nut-shaped bolt support 11 screwed into its longitudinal intermediate portion (its screwing portion is indicated by 12) is arranged, and the nut-shaped bolt support is provided. The tip portion of 11 is screwed into the rear end portion of the split collet 10 (the screwing portion is indicated by 14), and is fixed to the collet 10. The tool base end positioning bolt 13 is formed in a hollow shape having a diameter sufficiently smaller than the outer diameter of the tool T.
3a is connected to the oil hole 9 of the tool T so that the tip end surface of the bolt 13 is in contact with the base end surface of the tool T.

The bolt support 1 is provided in the oil flow passage 5.
1, a ring-shaped first oil-tight packing 15 having a substantially L-shaped cross section is provided inside, and the oil-tight packing 15 has its tip end surface abutting on the rear end surface of the bolt support 11 and The outer peripheral surface is arranged so as to contact the inner peripheral surface 1 a of the chuck body 1. Further, on the front side of the bolt support 11, a ring-shaped second oil-tight packing 16 formed in a substantially U-shaped cross section is arranged so as to be externally fitted to the tool base end positioning bolt 13. This oil tight packing 1
The rear end surface of the bolt support 11 is in contact with the front end surface of the bolt support 11, the front end surface is in contact with the base end surface of the tool T, and the outer peripheral surface is in contact with the rear end inner peripheral surface of the split collet 10. . The first and second oil-tight packings 15 and 16 are each made of synthetic rubber or the like.

When the tool T is attached, by rotating the tightening rotary cylinder 6 in the tightening direction, the chuck cylinder 4 is elastically deformed via the needle roller 7 and the diameter of the chuck cylinder 4 is reduced. The gripping force generated by the diameter reduction of 4 is applied to the straight shank portion s of the tool T via the collet 10.
The tool shank portion s is gripped and fixed.

When using the center oil supply type chuck having the above-mentioned structure, the taper shank portion 2 of the chuck body 1 is fitted to the main shaft (not shown) of the machine tool, and the female screw in the taper shank portion 2 is fitted. When the tapered shank portion 2 is pulled inward and fixed by a pull stud bolt (not shown) screwed to the portion 2a, the oil supply pipe in the main shaft and the oil supply hole of the pull stud bolt are connected to each other in a communicating state. To be done. Then, cutting oil having a constant pressure is introduced from the spindle side oil supply pipe into the oil flow passage 5 in the chuck body 1 through the oil supply hole of the pull stud bolt, and the tool base end positioning bolt 1 is further introduced from the oil flow passage 5.
The oil is supplied to the oil hole 9 of the tool T through the hollow portion 13a in the tool 3.

The pressure of the cutting oil introduced into the oil flow passage 5 is applied to the oil contact surface of the first oil-tight packing 15 installed in the oil flow passage 5 according to the principle of Pascal over the entire oil contact surface. uniformly act on, the outer peripheral surface of the first oil-tight packing 15 is in close contact is pressed against the inner peripheral surface of the chuck 5 body 1, also the pressing the rear end surface of the distal end surface bolt support 11 of the packing 15 Being closely contacted. In this case, the first oil-tight packing
Since 15 is formed in a substantially lateral L-shaped cross section,
The oil contact area is wider than an O-ring with the same cross-sectional area
Together with the chuck body inner peripheral surface 1a and the bolt support rear end
The contact area with the part also becomes wider. Therefore, the cutting oil
Pressure acts on the effective to the first oil-tight packing 15,
The outer peripheral surface of the packing 15 and its tip are chuck books.
Reliably strong on the inner peripheral surface 1a and the rear end of the bolt support
Sticks tightly, which gives a very good sealing effect
The first oil-tight packing 15 can be
It can be held securely in position. Therefore , the gap formed between the inner peripheral surface 1a of the chuck body 1 and the bolt support 11 is completely removed by the first oil-tight packing 15.
To be sealed.

The cutting oil on the side of the first oil-tight packing 15 is used for the bolt support 11 and the tool base end positioning bolt 13.
Through a small gap between the threaded portion 12 and the tool base end positioning bolt 13 and the base end surface of the tool T, that is, the front side of the bolt support 11, that is, the bolt support 11
When entering the space surrounded by the base end portion of the tool T, the collet 10 and the tool base end positioning bolt 13, the tip end surface of the second oil-tight packing 16 is caused by the pressure of the cutting oil that has entered. the proximal end face T, then the front end surface of the rear end face the bolt support 11, also the outer peripheral surface comes into close contact with their respective been pressed push the rear end portion inner peripheral surface of the split collet 10 divides it by a bolt support 11 The gap between the collet 10 and the gap between the split collet 10 and the base end surface of the tool T are sealed. In this case, the second oil-tight packing 16
Has a U-shaped cross section.
Cutting oil acting on the U-shaped opening of the packing 16 or 26
Due to the pressure of the U-shaped opening,
To the tip end surface of the support 11 and the base end surface of the tool T, respectively.
Are pressed against each other and firmly adhere to each other.
A very good sealing effect can be obtained.

As described above, due to the oil-tight sealing action of the first and second oil-tight packings 15 and 16, the oil flow passage 5 extends from the inner peripheral surface 1a of the chuck body 1 to the grip portion of the tool T. It will be completely oil-tightly sealed to the outside. Therefore, when the cutting oil is supplied from the oil flow passage 5 to the oil hole 9 of the tool T, the cutting oil never leaks to the outside of the chuck body 1.

FIG. 3 shows another embodiment of the present invention.
The bolt support 11 and the second embodiment shown in FIG.
The structure of the oil-tight packing 26 is only slightly different. That is, in the previous embodiment, the tip end surface of the second oil-tight packing 16 is in contact with the base end surface of the tool shank portion s, but in this embodiment, the ring-shaped first cross-section is formed in the inward U shape . Two
The oil-tight packing 26 is attached so that the inner peripheral surface of the tip portion thereof contacts the outer peripheral surface of the tool shank portion s, and the bolt support 11 is provided with a communication hole 17 penetrating in the axial direction. Therefore, according to this embodiment, the cutting oil on the side of the first oil-tight packing 15 is positively introduced to the side of the second oil-tight packing 26, and the pressure of the cutting oil allows the cutting oil on the side of the second oil-tight packing 26 The end face is uniformly pressed by the Pascal's principle to the rear end face of the bolt support 11 and the inner peripheral face of the tip end to the outer peripheral face of the tool shank s, respectively, to closely adhere to
A more effective oil tight seal is made. Also in this case, the second
The oil-tight packing 26 has a U-shaped cross section.
Acts on the U-shaped opening of this packing 26 because
Due to the pressure of cutting oil, the front and rear ends of this U-shaped opening
Is the outer circumference of the tip end surface of the bolt support 11 and the base end portion of the tool T.
Firmly adhered by being pressed against the surface in opposite directions
The result is a very good sealing effect.
it can. The other members are exactly the same as those in the previous embodiment, and the same members are designated by the same reference numerals.

In the embodiment described above, a chuck whose center oil supply type is used as a cutting oil supply system has been described, but the invention is not limited to this center oil supply type chuck, and the well-known end face oil supply type and side oil supply system described above are used. Of course, it can be applied to a chuck of a formula. In the embodiment, the needle roller type rotating cylinder has been described, but a screw type rotating cylinder for tightening such as a tightening nut can be used.

[0018]

According to the chuck of the present invention, the gap between the inner peripheral surface of the chuck body and the bolt support is sealed by the first oil-tight packing, and the bolt support and the collet are set by the second oil-tight packing. , And the gap between the collet and the base end of the tool are uniformly sealed by the Pascal's principle, so that the oil flow passage is completely oiled from the outside in the region extending from the inner peripheral surface of the chuck body to the gripping part of the tool. The tight seal prevents the cutting oil from leaking out of the oil flow passage when being supplied to the oil hole of the tool.

Particularly, according to the chuck of the present invention, the first oil tight
Since the packing is formed in a substantially lateral cross section L-shape,
The pressure of the cutting oil flowing through the oil flow passage is controlled by the first oil-tight packing.
The packing and the outer peripheral surface of the packing and its
Attach the tip to the inner surface of the chuck body and the rear end of the bolt support.
You can firmly and firmly adhere to each other, so that
It is possible to obtain a very good sealing effect and
Be sure to hold this first oiltight packing in place
And the second oil-tight packing has a generally U-shaped cross section
Since it is formed, it is created in the U-shaped opening of this packing.
The pressure of the cutting oil used is the tip of the U-shaped opening
Is the tip surface of the bolt support and the base surface or outer circumference of the tool
Firmly adhered by being pressed against the surface in opposite directions
The result is a very good sealing effect.
it can.

[Brief description of drawings]

FIG. 1 is a semi-longitudinal sectional view showing an embodiment of a chuck according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a semi-longitudinal sectional view showing another embodiment.

[Explanation of symbols]

 1 chuck body 2 taper shank part 4 chuck cylinder part 5 oil flow passage 6 rotating cylinder for tightening 8 groove T tool s tool shank part 9 tool oil hole 10 split collet 11 bolt support 11a oiltight packing rear end 12 Threaded Part 13 Tool Base End Positioning Bolt 13a Hollow Part 14 Screwed Part 15 First Oil-tight Packing 16 Second Oil-tight Packing 17 Communication Hole 26 Second Oil-tight Packing

Claims (2)

[Scope of utility model registration request] 1. A chuck main body is provided with an oil flow passage communicating with a chuck cylinder, a tool with an oil hole is mounted on the chuck cylinder via a collet, and a hollow tool base end positioning bolt is provided behind the tool. In a chuck that is supported by a nut-shaped bolt support that is screwed onto this, in the rear of the bolt support, the tip is in contact with the rear end of the bolt support, and the outer peripheral surface is the inner peripheral surface of the chuck body. Touch
A ring-shaped first oil-tight packing having an L-shaped cross section is arranged, and between the bolt support and the tool base end,
A ring shape whose tip is in contact with the base end surface of the tool and whose rear end is in contact with the front end surface of the bolt support and whose cross section is generally inwardly U-shaped
A second oil-tight packing. 2. A chuck main body is provided with an oil flow passage communicating with the chuck cylinder, a tool with an oil hole is attached to the chuck cylinder via a collet, and a hollow tool base end positioning bolt is provided behind the tool. In a chuck that is supported by a nut-shaped bolt support that is screwed onto this, in the rear of the bolt support, the tip is in contact with the rear end of the bolt support, and the outer peripheral surface is the inner peripheral surface of the chuck body. Touch
A ring-shaped first oil-tight packing having an L-shaped cross section is arranged, and between the bolt support and the tool base end,
The inner peripheral surface of the tip portion is in contact with the outer peripheral surface of the tool, and the rear end is in contact with the front surface of the bolt support body .
A chuck having a ring-shaped second oil-tight packing.