JPH0516110U - Check - Google Patents

Abstract

(57) [Abstract] [Purpose] A chuck that positively seals the area from the inner peripheral surface of the chuck body to the gripping part of the tool to prevent cutting oil from leaking out from the oil flow passage. The purpose is to provide. A first oil-tight packing 15 having a front end in contact with a rear end of the bolt support 11 and an outer peripheral surface in contact with an inner peripheral surface 1a of the chuck body 1 is provided behind the bolt support 11 to support the bolt. Between the body 11 and the base end portion of the tool T, the front end is in contact with the base end surface or the outer peripheral surface of the tool T and the rear end is the bolt support body 11.
The second oil-tight packing 16 is provided in contact with the tip surface of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, an oil flow passage communicating with the chuck cylinder is formed in the chuck body, a tool with an oil hole is attached to the chuck cylinder through a collet, and a hollow tool base end positioning bolt is provided behind the tool. To a chuck that is supported by a nut-shaped bolt support body that is screwed onto this.

[0002]

[Prior Art]

 When using this type of chuck, fit the base end side shank of the tool inside the chuck cylinder through the collet, and use the tool base end positioning bolt supported by the bolt support to fix the base end of the tool. Position the taper shank on the chuck body while holding the tool in place through the collet by rotating the tightening rotary cylinder that is externally fitted to the chuck cylinder in the tightening direction by positioning it at the specified position. Fits in the spindle of the working machine. For example, in the case of a center oil supply type chuck, the cutting oil is introduced into the oil flow passage from the oil supply pipe in the main shaft 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 tube part penetrates through the inside to supply oil to the oil flow passage, and in the case of the side oil supply type, the chuck body Oil is supplied to the oil flow passage of the chuck body through an oil passage of a non-rotating support member that rotatably supports the.

[Problems to be solved by the device]

The conventional chuck has no means for positively sealing the region extending from the inner peripheral surface of the chuck body to the gripping portion of the tool, so that the cutting oil flows from the oil flow passage of the chuck body. When the oil is supplied to the oil hole of the tool, the clearance between the inner peripheral surface of the chuck body, especially the clearance formed in the inner peripheral surface of the chuck and the chuck groove, and the bolt support, the bolt support and the collet, There is a problem that cutting oil leaks to the outside through the gap between the bolt support and the screwing portion of the tool base end positioning bolt, and further 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, so that the cutting oil can flow from the oil flow passages to the above-mentioned respective types. The purpose is to provide a chuck that does not leak outside through a gap.

[0005]

[Means for Solving the Problems]

 In the chuck according to claim 1 of the present invention, a first oil-tight rear end of the bolt support 11 is in contact with a rear end of the bolt support 11 and an outer peripheral surface thereof is in contact with an inner peripheral surface 1a of the chuck body 1. A packing 15 is provided, and a second oil-tight packing 16 is provided between the bolt support 11 and the base end portion of the tool T, the front end of which is in contact with the base end surface of the tool T and the rear end of which is in contact with the front end surface of the bolt support 11. Is provided.

Further, in the chuck according to the second aspect, the first oil, the front end of which is in contact with the rear end of the bolt support 11 and the outer peripheral surface of which is in contact with the inner peripheral surface 1 a of the chuck body 1, is located behind the bolt support 11. A tight packing 15 is provided, and between the bolt support 11 and the base end portion of the tool T, a second oil tight contact is provided in which the front end contacts the outer peripheral surface of the tool T and the rear end contacts the front end surface of the bolt support 11. A packing 26 is provided.

[0007]

[Action]

 The pressure of the cutting oil introduced into the oil flow passage 5 from the outside of the chuck body 1 uniformly acts on the entire surface of the first oil-tight packing 15 by the so-called Pascal principle. Immediately, according to Pascal's principle, the outer peripheral surface of the first oil-tight packing 15 is pressed against the inner peripheral surface 1a of the chuck body 1 to be in close contact therewith, and the tip of the first oil-tight packing 15 is located behind the bolt support 11. The end portion is pressed by the pressure equivalent to the above and is brought into close contact with the end portion, thereby sealing the gap between the inner peripheral surface 1a of the chuck body 1 and the bolt support 11. Further, the cutting oil on the side of the first oil-tight packing 15 passes through the gap between the bolt support 11 and the threaded portion 12 between the tool base end positioning bolt 13 and between the bolt support 11 and the tool T base end portion. If the cutting oil invades, the tip of the second oil-tight packing 16 will be on the base end surface of the tool T, or the tip of the second oil-tight packing 26 will be on the outer peripheral surface of the tool T, depending on the principle of Pascal. The second oil-tight packing 16 or 26 is evenly adhered, and the rear end of the second oil-tight packing 16 or 26 is evenly adhered to the front end of the bolt support 11, so that the gap between the bolt support 11 and the collet 10 and the collet 10 are prevented. The gap with the base end of the tool T is sealed. 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]

【Example】

 An embodiment will be described with reference to the drawings. FIG. 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, and an oil flow passage 5 is concentric inside the chuck main body 1 over its entire length. It is formed into a shape. Reference numeral 6 denotes a tightening rotary cylinder which 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. In between, 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.

A plurality of chuck grooves 8 having a cross-section 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 tubular 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, there is arranged a tool base end positioning bolt 13 in which a nut-shaped bolt support 11 is screwed into a longitudinal intermediate portion thereof (the screwing portion is indicated by 12), and a nut-shaped bolt. The support 11 is fixed to the collet 10 by screwing the tip of the support 11 into the rear end of the split collet 10 (the screwing portion is indicated by 14). 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, and the hollow portion 13a is in a state where the tip end surface of the bolt 13 is in contact with the base end surface of the tool T 1. The oil hole 9 of the tool T is communicated and connected with.

Inside the oil flow passage 5, a ring-shaped first oil-tight packing 15 is provided behind the bolt support 11, and the tip end surface of the oil-tight packing 15 is located behind the bolt support 11. The outer peripheral surface is arranged so as to contact the end surface and the inner peripheral surface 1 a of the chuck body 1. A ring-shaped second oil-tight packing 16 is arranged on the front side of the bolt support 11 so as to be fitted onto the tool base end positioning bolt 13, and the rear end surface of the oil-tight packing 16 is The bolt support 11 is in contact with the tip end surface, the tip 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 portion 4 is elastically deformed via the needle roller 7 and the diameter thereof is reduced. The gripping force generated by the diameter reduction of the cylindrical portion 4 acts on the straight shank portion s of the tool T via the collet 10, and the tool shank portion s is gripped and fixed.

When using the center oil supply type chuck having the above-described 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 inside of the taper shank portion 2 is fitted. When the taper shank portion 2 is pulled inward and fixed by a pull stud bolt (not shown) screwed to the female screw portion 2a of the above, the oil supply pipe in the main shaft and the oil supply hole of the pull stud bolt are in communication with each other. Connected to. 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 further the tool base end positioning bolt 13 is supplied from the oil flow passage 5. It is supplied to the oil hole 9 of the tool T through the inner hollow portion 13a.

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 Pascal's principle. Acting uniformly on the area, the outer peripheral surface of the first oil-tight packing 15 is pressed against and closely adheres to the inner peripheral surface of the chuck 5 body 1, and the tip surface of the packing 15 is evenly arranged on the rear end surface of the bolt support 11. It is pressed by the pressure of and comes into close contact. Therefore, the first oil-tight packing 15 seals the gap formed between the inner peripheral surface 1a of the chuck body 1 and the bolt support 11.

In addition, the cutting oil on the side of the first oil-tight packing 15 is a minute gap in the threaded portion 12 between the bolt support 11 and the tool base end positioning bolt 13, or the tool base end positioning bolt 13 and the tool T. Through a small gap with the base end surface of the bolt support body 11, that is, in the space surrounded by the bolt support body 11, the base end portion of the tool T, the collet 10, and the tool base end positioning bolt 13. When it penetrates, the tip surface of the second oil-tight packing 16 becomes the base end surface of the tool T, the rear end surface becomes the tip end surface of the bolt support 11, and the outer peripheral surface is divided by the pressure of the invading cutting oil. Each of the inner peripheral surfaces of the rear end of the collet 10 is pressed by a uniform pressure and adheres to the inner peripheral surface of the collet 10, thereby causing a gap between the bolt support 11 and the split collet 10, and between the split collet 10 and the tool T. Base The gap with the surface is sealed.

As described above, the oil-tight sealing action of the first and second oil-tight packings 15 and 16 allows the oil flow passage 5 to be exposed to the outside in a region extending from the inner peripheral surface 1a of the chuck body 1 to the gripping portion of the tool T. It will be completely oil tight. 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, which is different from the previous embodiment shown in FIG. 1 only in the structure of the bolt support 11 and the second oil-tight packing 26. 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 inner peripheral surface of the tip end of the second oil-tight packing 26 is the tool shank. The bolt support 11 is attached so as to be in contact with the outer peripheral surface of the link 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 causes the cutting oil on the side of the second oil-tight packing 26 The end face is uniformly pressed against the rear end face of the bolt support body 11 and the inner peripheral face of the tip end against the outer peripheral face of the tool shank portion s by the Pascal's principle, thereby closely adhering to each other, thereby providing a more effective oil-tight seal. The other members are exactly the same as 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 type has been described, but the present invention is not limited to this center oil supply type chuck. Of course, it can also be applied to side oil-filled chucks. Further, in the embodiment, the tightening rotary cylinder has been described as a needle roller type, but a screw type tightening rotary cylinder such as a tightening nut may be used.

[0018]

[Effect of the device]

 According to the chuck of the present invention, the first oil-tight packing seals the gap between the inner peripheral surface of the chuck body and the bolt support, and the second oil-tight packing seals the gap between the bolt support and the collet. The gap between the collet and the base end of the tool is uniformly sealed by the principle of Pascal, so that the oil flow passage is completely oil-tightly sealed to the outside in the region extending from the inner peripheral surface of the chuck body to the gripping portion of the tool. Therefore, when cutting oil is supplied to the oil hole of the tool, it will not leak out of the oil flow passage.

[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 path 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 portion 13 Tool base end positioning bolt 13a Hollow portion 14 Threaded portion 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 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. A first oil-tight packing which is in contact with the bolt support is provided, and a second oil-tight packing whose tip is in contact with the base end face of the tool and whose rear end is in contact with the tip end face of the bolt support is provided between the bolt support and the tool base end. A chuck characterized by being arranged. 2. A chuck body is provided with an oil flow passage communicating with the 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. A first oil-tight packing is provided which is in contact with the bolt support, and a second oil-tight packing whose tip is in contact with the outer peripheral surface of the tool and whose rear end is in contact with the tip of the bolt support is provided between the bolt support and the tool base end. A chuck characterized by being arranged.