JP3092885B2 - Inner diameter no setup clamp jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for clamping various workpieces having different inner diameters on a machine tool.

[0002]

2. Description of the Related Art A conventional inner diameter stepless clamping jig uses a collet (a ring having a large number of axial slits in the circumferential direction and capable of expanding the diameter). The work is clamped by being mounted and expanded in diameter by an expander (diameter expanding member).

[0003]

By the way, in an inner diameter non-step-setting clamp jig using a collet, since the diameter expansion of the collet is utilized, the inner diameter difference that can be clamped by the same collet is usually 0.1 mm. In the case of clamping a workpiece having a diameter of about 3 mm and having a greatly different inner diameter, it is necessary to change to a clamp jig using a collet having a different basic diameter, and the usability is poor. In addition, the pin that moves in the radial direction is
And press the end face to clamp in the axial direction.
When pulling, the axis of the drawbar that moves the pin in the radial direction
The stop position of the direction movement is the position where the pin engages with the inner surface of the work.
Is determined uniquely.
Move the claw for clamping in the axial direction in the axial direction with the draw bar
It was impossible. The present invention has been made to address the problems described above, word with may clamp without changing the jig a large work inner diameter difference
Drawbar that moves the pin that engages the inner diameter of the
The workpiece in the axial direction using the
It is an object of the present invention to provide a clamp jig having no inner diameter and capable of releasing a clamp .

[0004]

In order to achieve the above-mentioned object, in the present invention, the inner diameter non-step-up clamp jig is provided with a stepped cylinder having a step on the outer periphery in the circumferential direction at the tip. It has a plurality of equally-spaced openings and a plurality of equally-spaced radial mounting holes in the middle in the middle. A housing which is attached to and detached from the distal end in the axial direction, a plurality of pins which are assembled in the mounting holes of the housing so as to be able to protrude and retract in the radial direction and are biased inward by a first spring; A drawbar which is mounted to be movable in the axial direction and has a tapered portion which engages with the inner end of each of the pins at the distal end side of each of the pins; and a drawbar which is mounted to be movable in the axial direction to the inner hole at the distal end of the housing. And a second switch disposed coaxially with the drawbar. A case that is biased toward the front end of the drawbar by a ring, said by third spring mounted pivotably at one end in the radial direction in this case
The other end on the proximal side goes out of the housing through the opening.
A plurality of claws urged in a direction in which the fixed amount projects,
Each of the pins is moved by the axial movement of the drawbar to the proximal end.
It engages with the tapered part and is pushed radially outward to
The case engages with the diameter and the case is
The other ends of the plurality of claws are brought into engagement with the housing.
The work is projected out by a predetermined amount and
Between the drawbar and the tip of the drawbar
The case pushes the case forward with the drawbar.
The plurality of claws are engaged with the housing and
It is now stored in the jing .

[0005]

In the inner diameter stepless clamp jig according to the present invention, when the case is engaged with the draw bar and pushed forward against the second spring, each claw engages with the housing and engages with the housing. Since it is housed in the housing, the cylindrical work can be attached to and detached from the outer periphery of the housing from the front end side. When the drawbar is pulled in the axial direction toward the base end of the housing while the cylindrical work is inserted into the outer periphery of the housing, the case is disengaged from the drawbar and the second case is released.
Each claw is pushed in the axial direction by a spring and each claw is turned radially outward by a third spring, and the other end projects out of the housing by a predetermined amount to engage with the end of the work, and the tapered portion of the draw bar Each pin is pushed radially outward against the first spring and engages the inner diameter of the work at the outer end. Therefore, the work is clamped in the axial direction by the claws and the step portion of the housing, and is held in the radial direction by the pins, and is firmly clamped in a centered state.

When the draw bar is pushed axially into the front end of the housing in the clamped state, the draw bar engages with the case and pushes the case in the axial direction against the second spring. Is moved away from the end of the workpiece and engages with the housing to rotate radially inward against the third spring. The other end is housed in the housing, and the tapered portion of the drawbar is separated from each pin. Then, each pin is pushed radially inward by the first spring and moves away from the inner diameter of the work. Therefore, the workpiece is released from being held in the axial direction by the claws and the step portion of the housing, and is released from being held in the radial direction by the pins, whereby the clamp is released.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which a workpiece W1 having a long shaft length and a small inner diameter and a work W2 having a short shaft length and a large inner diameter are both clamped by using an inner diameter stepless clamping jig 10 according to the present invention. The jig 10 has a housing 11 and pins 12, a draw bar 13, a case 14 and claws 15 attached to the housing 11 as main components. The housing 11 has stepped portions 11a and 11b on the outer periphery, and is a stepped cylinder (in this embodiment, the main body 11A in this embodiment) which is fixed to the rotary support 20 of the machine tool by bolts at the large-diameter base end on the left side in the figure. And the stepped sleeve 11B were combined by bolts,
It is also possible to employ an integrally formed one), and three (or four or more) openings 11c are provided at equal intervals in the circumferential direction at the small diameter tip on the right side in the figure. Also, three (or four or more) radial mounting holes 11d are formed at equal intervals in the circumferential direction in the small-diameter intermediate portion, and cylindrical works W1 and W2 are formed on the outer periphery from the distal end side. Attached and detached in the axial direction.

The pin 12 is provided in each of the mounting holes 1 of the housing 11.
1d is mounted so as to be able to protrude and retract in the radial direction, and is urged inward by a first spring S1. The first spring S1 is locked at one end to the arm-shaped flange of the pin 12 and at the other end. It is locked to a stopper 16 fixed to the housing 11. The draw bar 13 is attached to the inner hole of the housing 11 so as to be movable in the axial direction, and is reciprocated by a double-acting hydraulic cylinder connected to the left end (not shown). Each pin 12 has a tapered portion 13a that engages with the inner end of the pin. The rotation of the draw bar 13 is regulated by a bolt attached to the housing 11.

The case 14 is mounted in the inner hole at the distal end of the housing 11 so as to be movable in the axial direction.
3 and is urged toward the tip of the drawbar 13 by the second spring S2. Second
The spring S2 is locked at one end to the tip of the case 14 and at the other end to a cap 17 fixed to the housing 11. Each of the claws 15 is rotatably mounted in a notch provided on the case 14 at one end via a support pin 18 so as to be rotatable in a radial direction, and is biased outward by a third spring S3. The spring S3 is locked at one end to the case 14 and at the other end to the claw 15. Then, each nail 15
When the case 14 is disengaged from the draw bar 13, the other end protrudes outside the housing 11 through the opening 11c of the housing by a predetermined amount, and the case 14 engages with the draw bar 13 to resist the second spring S2. When pushed forward, it engages with the housing 11 at the front end of the opening 11 c and rotates inward to be housed in the housing 11.

In this embodiment constructed as described above, when the case 14 is engaged with the draw bar 13 and is pushed forward against the second spring S2, each claw 15
Is engaged with the housing 11 and is housed in the housing 11, so that the cylindrical work W1 or W2 can be attached to and detached from the outer periphery of the housing 11 from the front end side. When the drawbar 13 is pulled in the axial direction toward the base end of the housing 11 by operating the hydraulic cylinder while the cylindrical work W1 or W2 is inserted into the outer periphery of the housing 11, the case 14 is The engagement with the draw bar 13 is released, the second spring S2 pushes the claws 15 in the axial direction, and each of the claws 15 is turned radially outward by the third spring S3, and the other end is moved outside the housing 11 by a predetermined amount. The pin 12 protrudes and engages with the end of the work W1 or W2, and each pin 12 is pushed radially outward by the tapered portion 13a of the draw bar 13, and engages with the inner diameter of the work W1 or W2 at the outer end. . Therefore, the work W1 or W2 is
5 is held in the axial direction by the step 11a or 11b of the housing and is held in the radial direction by each pin 12, and is firmly clamped in a centered state.

When the hydraulic cylinder is operated in such a clamped state to push the draw bar 13 axially into the front end side of the housing 11, the draw bar 13 is
And the case 14 is pushed in the axial direction against the second spring S2.
And is engaged with the housing 11 and pivots radially inward against the third spring S3 so that the other end is accommodated in the housing 11, and the drawbar 13
Is separated from each pin 12, and each pin 12 is pushed radially inward by the first spring S1 to be separated from the inner diameter of the work W1 or W2. Accordingly, the workpiece W1 or W2 is released from being held in the axial direction by the claws 15 and the stepped portions 11a or 11b of the housing, and is released from being held in the radial direction by the pins 12, thereby releasing the clamp.

[0012]

In summary, according to the present invention, the draw
When the bar moves axially to the proximal end, the housing
Each pin, which is mounted so that it can appear in the direction
Is pushed radially outward by the
And the case is disengaged from the drawbar.
Each of a plurality of claws rotatably mounted on the lever case
The end projects out of the housing by a predetermined amount and engages with the work end.
Together and sandwich the work between the step of the housing,
When the drawbar moves in the axial direction to the distal end,
The case is pushed forward by the drawbar,
Is engaged with the housing and housed in the housing.
Since, the radial direction of the workpiece inner diameter difference is within the radial movement of the pin due to the tapered portion of the drawbar by pins
Orientation can be held , and by precisely setting the amount of movement of each pin in the radial direction by the tapered portion of the drawbar, a workpiece with a large difference in inner diameter can be clamped accurately without changing the jig. It can be greatly reduced. Also, move the pin that engages the inner diameter of the work in the radial direction.
The axis of the workpiece using the axial movement of the draw bar
Direction clamp and release of clamp can be performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing one embodiment of an inner diameter stepless clamp jig according to the present invention.

[Explanation of symbols]

Reference numeral 10: Inner diameter non-setup clamp jig, 11: Housing, 1
1a, 11b step, 11c opening, 11d radial mounting hole, 12 pin, 13 drawbar, 13a taper, 14 case, 15 claw, S1 first spring,
S2: second spring, S3: third spring, W1,
W2 ... Work.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23Q 3/06 B23B 31/177 B23B 31/18

Claims (1)

(57) [Claims] 1. A stepped cylinder having a step on its outer periphery, having a plurality of openings at its tip at equal intervals in the circumferential direction and a plurality of radial mounting holes at its middle in the circumferential direction at equal intervals. A housing fixed at the base end to the support of the machine tool and having a cylindrical work attached to and removed from the outer periphery in the axial direction from the distal end side, and assembled to the mounting holes of the housing so as to be able to protrude and retract in the radial direction. The first
A plurality of pins that are biased inward by a spring, and a tapered portion that is axially movably assembled to an inner hole of the housing and that engages with the inner end of each of the pins. A drawbar having a drawbar, a case that is axially movable in an inner hole of the distal end of the housing, is disposed coaxially with the drawbar, and is urged toward the distal end of the drawbar by a second spring. The housing is rotatably mounted at one end in a radial direction, and the other end of the base end is passed through the opening by a third spring.
Equipped with a plurality of claws that are urged in the direction
The drawbar is moved in the axial direction toward the proximal end side by the drawbar.
Each pin engages with the tapered portion and is pushed radially outward.
The case is engaged with the inner diameter of the work and the case is
Each other end of the plurality of claws is disengaged from the bar and
Projecting a predetermined amount outside the housing, engaging with the end of the work
Between the drawbar and the tip of the drawbar.
The case is moved by the drawbar
Pushed forward to engage the plurality of claws with the housing
An inner diameter non-setup setup clamp jig characterized by being housed in a housing .