JP2001071206A - Part clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a part clamp device capable of clamping a ring-shaped part of a part to be surely fixed to eliminate apprehension of deformation in the ring-shape part, without performing fine adjustment of fastening force. SOLUTION: A part having a ring-shaped part is arranged in a clearance between inner/outer side support parts 31, 45 first the inner side support part 31 is diametrically spread by elastic deformation, its external peripheral part is support by abutting to an internal peripheral part of the part 69, and then the outer side support part 45 is diametrically contracted by elastic deformation, its internal peripheral part is made to abut to an external peripheral part of the part 69. In this way, the part is clamped by the inner/outer side support parts 31, 45. Accordingly, deformation of the part is prevented, and it can be surely held. This part clamp device eliminates necessity for fine adjustment of fastening force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component clamping device, and more particularly to a component clamping device capable of firmly fixing a ring-shaped portion of a component having a ring-shaped portion without deformation.

[0002]

2. Description of the Related Art When a part is cut by a lathe or the like, it is gripped and fixed by a part clamping device (chuck). In this type of component clamping device, the outer peripheral portion of a component to be machined by being attached to a spindle end of a lathe or the like is gripped and fixed with three or four claws. Since the component clamping device needs to firmly fix the component, the outer peripheral portion of the component is tightened with a considerable force.

[0003]

However, a component having a ring-shaped portion may be deformed when the ring-shaped portion is tightened with a large force from the outer peripheral side. On the other hand, if the tightening force is weak, the component cannot be reliably fixed, and may be detached from the component clamping device when processing the component. Therefore, when the ring-shaped part of the component is clamped by the component clamping device, a complicated operation for finely adjusting the tightening force is required. In addition, the component clamping device must also facilitate a high-cost component capable of finely adjusting the tightening force.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and can securely fix a ring-shaped portion of a component without clamping the clamping force. It is an object of the present invention to provide a component clamping device in which a part is not likely to be deformed.

[0005]

In order to achieve the above object, an invention according to a first aspect of the present invention comprises an inner support portion capable of being elastically deformed in a direction to increase the diameter, and a gap provided outside the inner support portion. An outer supporting portion that can be elastically deformed in a direction to reduce the diameter inward, an inner pressing member that presses the inner supporting portion in a direction to expand the diameter, an outer pressing member that presses the outer supporting portion in a direction to reduce the diameter, A component having an inner pressing member driving means for driving the inner pressing member, and an outer pressing member driving means for driving the outer pressing member, and having a ring-shaped portion between the inner supporting portion and the outer supporting portion. A component clamping device for arranging, increasing the diameter of the inner support portion, reducing the diameter of the outer support portion, and clamping a component by the inner support portion and the outer support portion; Drive unit After the inner support portion is pressed to increase the diameter and is brought into contact with the inner peripheral surface of the ring-shaped portion of the component having the ring-shaped portion first, the outer press member is driven by the outer press member driving means to drive the outer support portion. The component clamping device is characterized in that the component is pressed to reduce the diameter so as to contact the outer peripheral surface of the ring-shaped portion of the component having the ring-shaped portion.

According to a second aspect of the present invention, in the component clamping device according to the first aspect, the inner supporting portion is constituted by a tip portion formed with a plurality of slits of the inner collet,
The outer clamping portion is a component clamping device characterized in that it is constituted by a plurality of slits formed in the outer collet in which the inner collet is housed.

According to a third aspect of the present invention, in the component clamping device according to the first or second aspect, the inner pressing member has a shape corresponding to a polygonal hole formed at the tip of the inner collet and fits in the hole. The component clamping device is constituted by a fitting member, wherein the inner pressing member driving means rotates the inner pressing member relative to the inner collet to expand the diameter of the inner supporting portion.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the outer pressing member has a shape corresponding to a polygonal fitting portion formed on the outer periphery of the distal end portion of the outer collet. Wherein the outer pressing member driving means rotates the fitting portion relative to the polygonal hole to reduce the diameter of the outer supporting portion. is there.

According to a fifth aspect of the present invention, in any one of the component clamping devices according to the first to fourth aspects, the inner pressing member driving means and the outer pressing member driving means share one driving member which exerts a driving force. And a component clamping device.

According to a sixth aspect of the present invention, in the component clamping device according to the fifth aspect, one driving member is a slide member that drives the inner collet and the outer collet in the axial direction, and a slide member is provided on the slide member. And a pin operable in a direction transverse to the operation direction of the slide member.The inner press member driving means is formed in the inner collet, wherein the pin enters and the slide member is moved. When the pin slides, the pin cooperates to rotate the inner collet, and is constituted by an elongated hole-shaped inner cam that enlarges the inner support portion. When sliding, the pins work together to rotate the outer collet and reduce the diameter of the outer support. It is a component clamping apparatus characterized by being constituted by the side cams.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a component clamping device 1 according to an embodiment of the present invention will be described with reference to the drawings. Reference numeral 3 denotes a main housing. The main housing 3 is formed in a substantially cylindrical shape having a large thickness, and has a step hole 5. The step hole 5 is arranged and configured so that three large holes 7, a small diameter hole 9 and a large diameter hole 11 are continuously coaxial, and the large diameter hole 7 has a bottom 12.

Reference numeral 13 denotes a draw bar, and a large diameter portion 15 is formed at a position slightly closer to the base end side from the center of the draw bar 13. Three slide grooves 17 extending in the axial direction of the draw bar 13 are formed on the outer peripheral portion of the large diameter portion 15. An elongated hole 19 is formed at a position slightly deviated from the center of the draw bar 13 toward the tip end.
Reference numeral 9 extends in a direction crossing the axis of the draw bar 13. A pin 21 is inserted into the elongated hole 19, and the pin 21 is provided so as to intersect the axis of the draw bar 13, and can move in a direction in which the elongated hole 19 extends. The driving member is constituted by the draw bar 13 and the pin 21. At the distal end of the draw bar 13, a fitting member 23 as an inner pressing member is provided.
The fitting member 23 is formed in an octagonal column shape.

Reference numeral 25 denotes an inner collet, and a main portion 27 of the inner collet 25 has a cylindrical shape whose diameter becomes smaller in the middle. The main portion 27 is formed with three slits 29 extending from the front end portion to the rear end portion.
The tip of the main part 27 is divided into three parts through a slit 29,
The divided portions form the inner support portion 31. The inner support portion 31 can be elastically deformed in a direction to increase the diameter. The distal end face of the main portion 27 is opened and provided with a square hole 33, and the square hole 33 is formed in a shape in which the fitting member 23 fits exactly. Note that the outer peripheral portion of the inner support portion 31 is thick.

On the outer periphery of the cylindrical portion having a large diameter of the main portion 27, an inner hole-shaped inner cam 35 bent from the middle is formed. A pair of inner cams 35 are provided and provided at symmetrical positions. This inner cam 35, drawbar 1
3. The inner pressing member driving means is constituted by the pin 21. Further, a flange 37 is provided at a rear end of the main portion 27.

Reference numeral 39 denotes an outer collet, and a main portion 41 of the outer collet 39 has a cylindrical shape whose diameter becomes smaller in the middle. The main portion 41 is formed with three slits 43 extending from the front end portion to the rear end portion.
The leading end of the main part 41 is divided into three parts through a slot 43,
An outer supporting portion 45 is formed by the divided portions, and the outer supporting portion 45 can be elastically deformed in a direction in which the diameter is reduced. The outer peripheral portion of the outer support portion 45 is thick, and is formed so as to form a dodecagonal shape by joining the three portions and forming the slot 43 to connect the missing portions. The distal end face of the main part 41 is opened and a round hole 44 is provided.

On the outer periphery of the cylindrical portion of the main portion 41 having a large diameter, there is formed a long hole-shaped outer cam 47 which is bent in the middle. The inclination angle of the outer cam 47 is set to be gentler than the inclination angle of the inner cam 35. A pair of outer cams 47 are provided and provided at symmetrical positions. The outer cam 47, the draw bar 13, and the pin 21 constitute an outer pressing member driving unit. A flange 49 is provided at the rear end of the main part 41.

Reference numeral 51 denotes a connecting housing, and the connecting housing 51 has a boss 53. The connecting housing 51 has a step hole 55 formed therein.
Is arranged and configured such that three holes of a large diameter hole 57, a small diameter hole 59 and a large diameter hole 61 are continuously coaxial. Reference numeral 63 denotes a disk-shaped lid, and a dodecagonal polygonal hole 65 is formed in the center of the lid 63. The polygonal hole 65 forms an outer pressing member.

As shown in FIG. 2, the draw bar 13 is inserted into the rear end opening of the inner collet 25 from the front end side, and is accommodated in the inner collet 25. The fitting member 23 of the draw bar 13 fits exactly into the square hole 33 of the inner collet 25. Further, the inner collet 25 is inserted from the rear end opening of the outer collet 39 from the front end side thereof, and is accommodated in the outer collet 39. The outer peripheral portion of the inner support portion 31 of the inner collet 25 is arranged with a gap from the inner peripheral portion of the outer support portion 45 of the outer collet 39. The pin 21 is connected to the draw bar 13, the inner collet 25 and the outer collet 39.
After assembling, the outer cam 47, the inner cam 35, and the elongated hole 19 are inserted in this order. Both ends of the pin 21 enter a pair of the inner cam 35 and the outer cam 47.

Drawbar 1 assembled as described above
3. The inner collet 25 and the outer collet 39 are accommodated in the step hole 5 of the main housing 3. The rear end of the draw bar 13 projects into the large-diameter hole 11, and the large-diameter portion 15 is accommodated in the small-diameter hole 9. A detent pin 67 is inserted from the outer peripheral surface of the main housing 3.
Into the slide groove 17. Therefore, the drawbar 13
Are provided so that the operation in the rotation direction is restricted, and the operation is possible only in the axial direction. The draw bar 13 is connected to a piston rod of an air cylinder (not shown) and is driven in the axial direction.

The connecting housing 51 is attached to the front surface of the main housing 3 by bolts (not shown),
Fits in the large-diameter hole 7. Further, a lid 63 is attached to a front surface of the connection housing 51 by a bolt (not shown). The outer supporting portion 45 of the outer collet 39 fits in the polygonal hole 65 of the lid 63. Reference numeral 69 denotes a component having a ring-shaped portion, and the component 69 is clamped by the component clamping device 1 as described later, and the end face is cut.

Next, the operation of the component clamping device 1 will be described. The component clamping device 1 is used by being attached to a processing device such as a lathe. FIG. 2 to FIG.
Both the inner support portion 31 and the outer support portion 45 of the
2 shows an unclamped state in which is not clamped. In this unclamped state, the pin 21 is located at the most distal end side of the inner cam 35 and the outer cam 47. The component 69 is supplied to the gap between the inner support portion 31 and the outer support portion 45 of the component clamp device 1 in the unclamped state by a component supply device (not shown).

When the draw bar 13 is slid from the unclamped state in the rear end side direction (hereinafter referred to as A direction, the direction opposite to A direction is referred to as B direction) as shown in FIGS. The pin 21 moves to the intermediate position between the inner cam 35 and the outer cam 47 in conjunction with the draw bar 13. Since the inner cam 35 and the outer cam 47 are bent from the middle in different directions, the inner collet 25 is
At about 20 degrees clockwise, and the outer collet 39 rotates about 5 degrees counterclockwise. When the inner collet 25 rotates as described above, the flat portion of the inner peripheral surface of the square hole 33 and the corner of the fitting member 23 come into contact, and the fitting member 2
3 presses the inner support portion 31, and the inner support portion 23 is elastically deformed to expand the diameter. Then, the outer peripheral surface of the inner support portion 31 contacts the inner peripheral surface of the component 69, and the inner peripheral surface of the component 69 is supported.

Further, when the draw bar 13 is driven in the direction A, the clamped state shown in FIGS. That is, as the draw bar 13 is driven in the direction A, the pin 21 is operated, and the outer cam 47 rotates the outer collet 39 further counterclockwise by about 10 degrees. As described above, since the inner support portion 31 is in contact with the inner peripheral surface of the component 69, the inner collet 25 cannot rotate any more. However, since the pin 21 enters the elongated hole 19 and can be moved in a direction transverse to the axis of the draw bar 13, the pin 21 is moved in the direction A as shown in FIG. Right direction on paper (hereinafter C direction, direction opposite to C direction D)
To work. Therefore, the pin 21 can operate inside the inner cam 35 and the outer cam 47.

When the pin 21 moves inside the outer cam 47 as described above, the outer collet 39 rotates about 10 degrees in the counterclockwise direction. Then, as shown in FIG.
The outer peripheral portion of the outer peripheral portion 45 is pressed against the outer peripheral portion of the outer supporting portion 45, and the outer supporting portion 45 is elastically deformed and reduced in diameter. . Then, the inner peripheral portion of the outer support portion 45 contacts the outer peripheral portion of the component 69, and the component 69 is clamped by the outer support portion 45 and the inner support portion 31. Thus, the inner cam 35 and the outer cam 47
Share one drawbar 13 and one pin 21.
The end face of the component 69 is cut by a cutting device (not shown) in a state of being clamped by the inner support portion 31 and the outer support portion 45. When the pin 21 operates from the state shown in FIG. 7 to the state shown in FIG. 10, the inner support 31 slightly expands in diameter, but the inner support 31 and the outer support 45 can be elastically deformed. Is not deformed.

When releasing the clamp of the component 69,
The draw bar 13 is driven in the direction B to return the outer support portion 45 to the reduced diameter state, and then return the inner support portion 31 to the expanded diameter state. At this time, after the pin 21 moves in the D direction,
The inner cam 35 and the outer cam 47 are moved in the opposite direction.

The component 69 having the ring-shaped portion as described above
Is disposed in the gap between the inner support portion 31 and the outer support portion 45,
First, the inner support portion 31 is elastically deformed to increase the diameter, and the outer peripheral portion of the inner support portion 31 is supported by being brought into contact with the inner peripheral portion of the component 69, and then the outer support portion 45 is elastically deformed to reduce the diameter. Then, the inner peripheral portion of the outer support portion 45 is brought into contact with the outer peripheral portion of the component 69.
Thus, the component 69 is clamped between the inner support portion 31 and the outer support portion 45. Therefore, the component 69 can be securely held without being deformed. The component clamp device 1 does not require fine adjustment of the tightening force.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and there are changes in the design without departing from the gist of the present invention. Are also included in the present invention. For example, a component having a ring-shaped portion does not need to be entirely ring-shaped as in the case of the component 69, but may have a ring-shaped portion in part. For example, even if the outer peripheral portion is rectangular or the like, if the hollow portion is ring-shaped, it is included in a component having a ring-shaped portion.

The fitting portion does not have to be an octagonal column, but may be a polygonal column having three or more corners, and the polygonal hole may have any shape having three or more corners. Furthermore, in the above-described embodiment, a combination of a polygonal hole and a member fitted into the hole is used as a mechanism for driving the inner support portion and the outer support portion, but the present invention is not limited to this. Not something.

Further, the mechanism for rotating the inner collet and the outer collet is not limited to the combination of the elongated hole cam and the pin, and the inner collet and the outer collet may be rotated by a motor or the like. Alternatively, the inner collet may be fixed and the fitting member may be rotated, or the outer collet may be fixed and the lid having the polygonal hole may be rotated.

[0030]

As described above, according to the component clamping device of the present invention, the fine adjustment of the tightening force is not performed,
The component having the ring-shaped portion can be securely fixed, and there is no possibility that the component is deformed. Further, the component clamping device does not require a mechanism for finely adjusting the tightening force, and therefore can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a component clamping device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the component clamping device according to the embodiment of the present invention in an unclamped state.

FIG. 3 is a front view showing a state of an inner support portion and an outer support portion in an unclamped state of the component clamping device according to the embodiment of the present invention.

FIG. 4 is a plan view for explaining positions of an inner draw bar and a pin in an unclamped state of the component clamping device according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of the component clamp device according to the embodiment of the present invention during operation between an unclamped state and a clamped state.

FIG. 6 is a front view showing a state of the inner support portion and the outer support portion during operation between the unclamped state and the clamped state of the component clamping device according to the embodiment of the present invention.

FIG. 7 is a plan view for explaining the positions of the inner draw bar and the pin during operation between the unclamped state and the clamped state of the component clamping device according to the embodiment of the present invention.

FIG. 8 is a sectional view of the clamped state of the component clamping device according to the embodiment of the present invention.

FIG. 9 is a front view showing a state of the inner support portion and the outer support portion in the clamped state of the component clamping device according to the embodiment of the present invention.

FIG. 10 is a plan view for explaining positions of an inner draw bar and a pin in a clamp state of the component clamping device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamping device 13 Drawbar 19 Slot 21 Pin 23 Fitting member 25 Inner collet 29 Slot 31 Inner support part 33 Square hole 35 Inner cam 39 Outer collet 43 Slot 45 Outer support part 47 Outer cam 65 Polygonal hole 69 Ring shape Parts with parts

Claims (6)

[Claims] 1. An inner support portion capable of being elastically deformed in a direction of increasing the diameter, an outer support portion disposed with a gap outside the inner support portion and capable of being elastically deformed in a direction of reducing the diameter inward, and the inner support portion. An inner pressing member that presses the outer supporting portion in a direction to reduce the diameter of the outer supporting portion; an inner pressing member driving unit that drives the inner pressing member; and a drive unit that drives the outer pressing member. An outer pressing member driving means, a component having a ring-shaped portion is disposed between the inner supporting portion and the outer supporting portion, the inner supporting portion is enlarged in diameter, and the outer supporting portion is reduced in diameter. Then, in the component clamping device for clamping a component by the inner supporting portion and the outer supporting portion, the inner pressing portion is driven by the inner pressing member driving means to press the inner supporting portion to expand the diameter, and the ring-shaped portion is formed first. Parts with parts After being brought into contact with the inner peripheral surface of the ring-shaped portion, the outer pressing member driving means drives the outer pressing member to press the outer supporting portion to reduce the diameter, and the outer peripheral surface of the ring-shaped part having the ring-shaped portion A component clamping device characterized by being brought into contact with a component. 2. The component clamping device according to claim 1, wherein the inner supporting portion is constituted by a tip portion formed with a plurality of slits of the inner collet, and the outer supporting portion is formed by the outer collet accommodating the inner collet. Characterized in that it is constituted by a tip portion formed with a plurality of slits. 3. The component clamping device according to claim 1, wherein the inner pressing member is formed by a fitting member which fits into the hole with a shape corresponding to the polygonal hole formed at the tip of the inner collet. A component clamping device, wherein the inner pressing member driving means rotates the inner pressing member relative to the inner collet to expand the diameter of the inner supporting portion. 4. The component clamping device according to claim 1, wherein the outer pressing member is formed by a polygonal hole having a shape corresponding to a polygonal fitting portion formed on the outer periphery of the distal end portion of the outer collet. The component clamping device, wherein the outer pressing member driving means is configured to rotate the fitting portion relatively to the polygonal hole to reduce the diameter of the outer supporting portion. 5. The component clamping device according to claim 1, wherein the inner pressing member driving means and the outer pressing member driving means share one driving member which exerts a driving force. Parts clamping device. 6. A component clamping device according to claim 5, wherein one driving member is a slide member for driving the inner collet and the outer collet in the axial direction, and the slide member intersects the operation direction of the slide member. And a pin operable in a direction transverse to the operation direction of the slide member.The inner pressing member driving means is formed in the inner collet, and when the pin enters and the slide member slides, the pin moves. When the inner collet is rotated, the inner collet is rotated, and the inner supporting portion is formed to have a large diameter. The outer collet rotates in conjunction with the outer collet to reduce the diameter of the outer support. Parts clamping apparatus characterized by being.