JP2003231009A - Collet member and spindle unit using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collet member capable of clamping a tool inserted through a tool receive port without causing off-centered tool axis. <P>SOLUTION: This collet member 10 is constituted in such a way that a tapered part 12 whose diameter is gradually reduced toward the back from the tool receive port 14 is formed and a plurality of thin clearances 11 which do not reach the tool receive port and a rear end 16 are provided in the axial direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical member for gripping a tool inserted from the tip, that is, a collet member, and a spindle unit using the same.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional collet member 50, in which (a) is a front end face of the collet member 50 and (b) is a front end face.
Is a cross section from the dashed-dotted line C-C, a bottom is a side surface and a partially broken view. In FIG. 4, a collet member 50 is a tubular member for gripping a tool inserted into the hole 58 from the tool receiving port 54, and has a tapered portion 52 having a diameter gradually decreasing toward the rear near the tip 53. Is formed, and this tapered portion 5
A cylindrical portion 55 linearly extending with the same diameter is provided in a section from 2 to the rear end 56, and the tip surface 53 is provided from the middle of the cylindrical portion 55.
Slots, that is, a plurality of slits 51 are formed in the section up to, whereby the tip 53 is divided into three claws. The collet member 50 is inserted into a sleeve member having a hole having a shape complementary to the tapered portion 52, expands and contracts in the radial direction when a pressing force is applied from the hole surface of the sleeve member, and grips the tool by this expansion and contraction. is there.

[0003]

However, since the tip 53 of the conventional collet member 50 is divided into a plurality of claws by the slit 51, the collet member 50 is not tightened when it receives a pressing force. However, the tip 53 may be twisted and deformed, and the diameter may be reduced due to uneven displacement. In this case, the tool may be misaligned when the tool is rotated, and the tool may be broken or an error may be generated in the tool. Will occur.

The present invention focuses on the above-mentioned drawbacks of the prior art and solves this problem. An object of the invention is to collect a tool inserted from a tool receiving hole so as to prevent misalignment of the tool. To provide.

Another object of the present invention is to provide a spindle unit in which a tool can be gripped without misalignment.

[0006]

According to the present invention, there is provided a tubular member for holding a tool inserted inside from a tip thereof, wherein a taper portion having a diameter gradually reduced from the tool receiving portion toward the rear is formed. Provided is a collet member characterized in that a plurality of slits are provided in an axial direction so as not to reach a tool receiving hole and a rear end. The collet member of the present invention is inserted into a shaft member having a hole having a shape complementary to the taper portion, and when the taper portion receives a pressing force from the inner surface of the hole, the section provided with the slit shrinks toward the inside of the hole. It elastically deforms so as to have a diameter, and the elastically deformed portion presses the tool and grips the tool. Here, since the slit of the collet member of the present invention is provided so as not to reach the tool receiving port, the tip is continuous in an annular shape, and the tip is formed into a plurality of claws like the conventional collet member. Since they are not separated, no uneven displacement is generated in the annular portion at the tip, and misalignment of the tool is prevented.

In the collet member, a plurality of narrow grooves may be formed in the axial direction instead of the narrow gap.
Here, the thin groove is formed so that a thin portion is left at the bottom of the groove and does not penetrate into the cylinder, and the thin portion receives a pressing force from the outer peripheral surface of the taper portion or the like. Any thickness may be used as long as it is elastically deformed to a reduced diameter. In the collet member having such a configuration, like the collet member having the slit, no uneven displacement occurs in the annular portion at the tip,
Tool misalignment is prevented.

In the present invention, the collet member, the main shaft to which the collet member can be attached, the bearing provided to rotatably support the main shaft, the collet member, the main shaft, the bearing, and the rotation A spindle unit is provided, which comprises a housing member that houses a drive means. Here, in the spindle unit of the present invention, as a rotary driving means for rotationally driving the main shaft, a rotor fixed to the main shaft and an air supply passage for rotating the rotor are configured, Alternatively, it is configured to include a connection portion to a motor connected to the main shaft as a separate member, or
Either configuration can be selected as appropriate.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited thereto.

FIG. 1A shows the front end surface of the collet member 10,
In FIG. 1 (b), the collet member 10 is located above the one-dot chain line C-C.
Is a cross section, the bottom is a side view and a partially cutaway view. The collet member 10 is a tubular member for gripping a tool inserted into the hole 18 from the tool receiving port 14, and a taper portion 12 having a diameter gradually decreasing toward the rear is formed near the tip, A cylindrical portion 15 linearly extending with the same diameter is formed in the section from the tapered portion 12 to the rear end 16, and a plurality of slits 11 are formed in the section from the middle of the cylindrical portion 15 to the tip.
Here, the slit 11 means the tapered portion 12 and the cylindrical portion 15.
It penetrates from the outer peripheral surface such as to the inside 18 of the hole. Each slit 11 is provided so as not to reach the tool receiving port 14,
The tool receiving port 14 at the tip has an annular continuous portion 1 which is annularly continuous.
3 is left, and therefore the tip is not divided into a plurality of claws like the conventional collet member 50 shown in FIG. A fitting surface 13 ′ for fitting a hexagon wrench is formed at the tip of the collet member 10, and a screw thread is provided on the inner peripheral surface of the rear end 16 of the cylindrical portion 15 to form a female screw 17. .

FIG. 3 shows a collet member 40 of a different mode, in which a cross-section is taken from one-dot chain line C-C and a bottom is a side view and a partially cutaway view. 3, the same components as those of the collet member 10 of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. The collet member 40 is provided with a plurality of narrow grooves 41 in place of the slit 11 of the collet member 10 of FIG. 1, and the other configurations are the same as those of the collet member 10. Here, the narrow groove 41 is formed so that a thin portion 41 ′ is left at the bottom of the groove and does not penetrate into the cylinder.
The thin portion 41 ′ may have a thickness that elastically deforms so as to reduce the diameter when a pressing force is applied from the outer peripheral surface of the taper portion 12 or the like. The thin portion 41 ′ is formed to have a thickness of, for example, about 1 to 3% of the wall thickness of the cylindrical portion 15. Therefore, when the wall thickness of the cylindrical portion 15 is 10 to 30 mm, The thin portion 41 'has a thickness of about 0.1 to 0.3 mm.

Next, a spindle unit 30 using the collet member 10 will be described with reference to FIG.
The spindle unit 30 is used by being incorporated in a device such as a machine tool, and the rotor 27 is used for the spindle 2.
1,31, the main shaft 21,31 is the bearing 2
2, 29 are rotatably supported in the housing members 23, 24, 25, and a rotation space 33 for rotating the rotor 27 is provided between the housing members 23, 24 and the main shaft 21. 24 is a connecting shaft 2
The connecting member 28 having 8a is fixed, and the connecting shaft 28a is connected to a device such as a machine tool.

The main shaft 21 has a hole formed in a complementary shape for inserting the collet member 10, and a main shaft 31 having a male screw at its tip is fixed in the hole.
The male screw of the main shaft 31 is attached to the female screw 17 of the collet member 10.
Are screwed together. A taper portion having a shape complementary to the taper portion 12 of the collet member 10 is formed at the tip of the main shaft 21.

The housing member 25 includes an air passage 2
A connecting member 26 having 6a is provided, and a pipe extending from a compressor (not shown) or the like is connected to the connecting member 26. The air passage 26a communicates with the rotating space 33 through the air passage 26b and an air passage (not shown), and the compressed air supplied from the compressor is the air passages 26a, 26b and the air (not shown). It is sent to the rotating space 33 through the passage to rotate the rotor 27.

The collet member 10 is inserted into the hole of the main shaft 21, and when the female screw 17 is pushed into the male screw of the main shaft 31 while being screwed, the collet member 10 is pressed by the taper portion of the main shaft 21. The section in which the slit 11 is provided elastically deforms toward the inside of the hole to reduce the diameter. The part elastically deformed so as to reduce the diameter is crimped to a tool (not shown) inserted in the hole 18 of the collet member 10 to grip the tool. At this time, the collet member 10 has an annular continuous portion 13 at the tip thereof, and since the tip is not divided into a plurality of claws like the conventional collet member shown in FIG. 4, a pressing force is applied from the taper portion of the main shaft 31. Even if received, the annular continuous portion 13
There is no uneven displacement of the tool, and therefore tool misalignment is prevented.

[0016]

Since the collet member of the present invention is provided so that the slit does not reach the tool receiving port, the tip is continuous in an annular shape, and the tip has a plurality of claws like the conventional collet member. Therefore, even when a pressing force is applied from the outer circumference, no uneven displacement occurs in the annular portion at the tip, and the tool inserted from the tool receiving port is gripped so as not to be misaligned. be able to. Further, in the spindle unit of the present invention, since the collet member as described above is used, the tool inserted from the tool receiving port can be gripped so as not to be misaligned.

[Brief description of drawings]

FIG. 1 is a collet member of the present invention, in which (a) is a front end face of the collet member, (b) is a cross-section from a dashed-dotted line C-C to an upper side, a lower side is a side view and a partially cutaway view.

FIG. 2 is a sectional view of a co-spindle unit of the present invention.

FIG. 3 is another aspect of the collet member of the present invention, in which a cross-section is taken from the one-dot chain line C-C, a bottom is a side view and a partially cutaway view.

FIG. 4 shows a conventional collet member,
(A) is a front end face of a collet member, (b) is a dashed-dotted line C-
From C, an upper part is a cross section, a lower part is a side view, and a partial cutaway view.

[Explanation of symbols]

10 Collet member 11 slit 12 Tapered part 14 Tool receptacle 16 rear end 30 spindle unit 21 Spindle 27 rotors 23, 24, 25 Housing member 31 spindle

Claims (3)

[Claims] 1. A tubular member for gripping a tool inserted inside from a tip end thereof, wherein a taper portion having a diameter gradually reduced rearward from a tool receiving port is formed to reach the tool receiving port and the rear end. A collet member having a plurality of slits provided in the axial direction. 2. A tubular member for gripping a tool inserted from the tip into the inside thereof, wherein a taper portion having a diameter gradually reduced from the tool receiving portion toward the rear is formed, and at least the taper portion is provided inside the cylinder. A collet member, characterized in that a plurality of fine grooves which do not penetrate are provided, and the tool receiving port is formed thicker than the thin groove portion of the tapered portion. 3. The collet member according to claim 1 or 2, a main shaft to which the collet member can be attached, a bearing provided to rotatably support the main shaft, the collet member and the A spindle unit, comprising: a main shaft, the bearing, and a housing member that houses the rotation driving means.