JP4871094B2 - Deformation workpiece chuck device - Google Patents

Description

  The present invention is directed to a chuck device used for gripping a workpiece during lathe processing, and more particularly to a deformed workpiece having a shaft-shaped main body portion and a shaft-shaped branch portion branched from the main body portion. The present invention relates to a chuck device.

  Generally, a chuck device that grips a workpiece in lathe processing or the like moves a gripping claw (jou) provided at the front of the chuck main body in the radial direction by advancing and retreating a draw bar, etc. By gripping the part, the workpiece to be processed is held so that its axis is coaxial with the central axis of the chuck body.

  In addition, when the workpiece has an irregular shape having a projection whose radial dimension is larger than the location to be clamped, such as a workpiece of various automobile parts, the projection interferes with the operation of the gripping claw at the time of clamping. A special chuck device for deformed workpieces is used.

This kind of irregularly shaped workpiece chuck device is described in, for example, Patent Document 1 and Patent Document 2.
JP-A-9-277107 JP 2004-154876 A

The chuck devices described in Patent Document 1 and Patent Document 2 attempt to grip the axis of the main body portion of the irregularly shaped workpiece coaxially or in parallel with the axis of the chuck device.

By the way, a workpiece having a plurality of axial centers, for example, as shown in FIG. 5, an axial main body w1 having an axial center c1, and an axial branch-shaped part w2 having a central axis c2 branched from the main body w1. In the case of the odd-shaped workpiece W having the shape, it may be necessary to hold the branch c w2 so that the axis c2 of the branch portion w2 is coaxial with the center axis of the chuck body.
Such a case corresponds to a case where a lathe or the like is applied to the outer periphery of the branch-shaped portion w2 or, if the branch-shaped portion w2 is cylindrical, the inner and outer periphery thereof.

  However, the branch-shaped portion w2 generally has a short axial length (projection height) in many cases. In such a case, the grip margin of the branch-shaped portion w2 (area of the outer peripheral surface of the branch-shaped portion that can be gripped) is narrow, and the center of gravity of the workpiece W is substantially biased toward the main body portion w1. For this reason, it is difficult to firmly grip the entire workpiece W by gripping only the branch portion w2 from the outer periphery. That is, it is necessary to firmly hold not only the branch-shaped portion w2 but also the main body portion w1.

In order to firmly hold the branch portion w2 and the main body portion w1, respectively, first, the main body portion w1 is held in the direction of the axis c1 of the main body portion w1 and the radial direction of the main body portion w1, respectively, It is necessary to grip the branch portion w2 so as not to move in a state in which the axis c2 coincides with the central axis of the chuck body.
Thus, a complicated mechanism is required for a chuck device having gripping means in multiple directions. It is desirable that the structure of the chuck device be as simple as possible.
Further, if the number of gripping means for gripping the workpiece in each direction increases, the attaching / detaching work including the positioning of the workpiece tends to be complicated.

  Accordingly, the present invention can grip the workpiece so that the axis of the branch portion of the deformed workpiece is coaxial with the axis of the chuck body while simplifying the structure of the chuck device and the work of attaching and detaching the workpiece as much as possible. The challenge is to do so.

  In order to solve the above-mentioned problems, the present invention provides a work comprising a shaft-shaped main body having an axis and a shaft-shaped branch having a shaft branched from the main body. In the chuck device for gripping so that the axial center of the main body is coaxial with the central axis of the chuck body, the main body portion is sandwiched between the axial ends of the main body portion between the chuck body and the axial center of the main body portion. Provided with a first gripping means for gripping in the direction, and provided with a second gripping means for gripping the main body portion in the radial direction of the main body portion with the outer peripheral portion of the main body portion sandwiched in the radial direction of the main body portion, A plurality of gripping claws are provided around the central axis of the chuck body, and third gripping means for gripping the outer peripheral portion of the branch-shaped portion around the axis of the branch-shaped portion with the gripping claws is provided. An actuator that moves back and forth in the axial direction of the central axis is provided. By moving the eta in one axial direction of the central axis, the first gripping means grips between both ends in the axial direction of the main body, and then further moves the actuator in one axial direction of the central axis. The second gripping means grips the outer peripheral portion of the main body, and further, the gripping claws of the third gripping means are moved by moving the actuator in one axial direction of the central axis. The configuration of the deformed workpiece chuck device that grips the outer periphery of the branch-shaped portion and grips the workpiece W so that the axis of the branch-shaped portion is coaxial with the central axis of the chuck body is employed.

  According to this configuration, each of the first, second, and third gripping units functions in order by the advance or retreat of the single actuator in the axial direction, and the branch portion and the main body of the workpiece are firmly connected to each other. And can be gripped. In other words, the work can be attached and detached by operating one actuator with a draw bar or other driving means, so that the structure of the chuck device can be simplified. Further, if the work is attached / detached at a predetermined timing based on the operation of the actuator, the intermediate work other than the operation of the actuator is unnecessary, and the work can be simplified.

In the above-described configuration, the first gripping means is arranged so that one end of the main body is directed to an end cradle provided on the front surface of the chuck main body and parallel to the central axis of the chuck main body. When the first advancing / retracting shaft moves in one axial direction along the central axis of the chuck body, an end pressing member that operates in conjunction with the movement of the first advancing / retreating shaft moves the other end of the main body portion. The second gripping means holds the outer peripheral portion of the main body portion by pressing toward the one end portion and sandwiching the main body portion between the end receiving base and the end pressing member. The second advancing / retreating shaft provided parallel to the central axis of the chuck body moves to one axial direction along the central axis of the chuck body, while addressing to the support base provided toward the front surface of the chuck body. The outer peripheral pressing member that operates in conjunction with the movement of the second advance / retreat axis The main body portion is held by holding the front surface side of the outer peripheral portion toward the support base and sandwiching the main body portion between the support base and the outer peripheral pressing member, and the first advance / retreat axis of the first grip means, and The second advancing / retreating axis of the second gripping means may adopt a configuration in which the actuator moves in one axial direction when the actuator moves in one axial direction of the central axis.

According to this structure, each said 1st, 2nd holding means operate | moves by the axial direction advance or retreat of a respectively corresponding 1st, 2nd advancing / retreating axis | shaft, The advancing / retreating direction is said 3rd holding means. This is the same as the forward / backward direction of the actuator that operates the actuator.
For this reason, it is easy to link each gripping operation by the first and second gripping means with the movement of the actuator. If the advancing and retreating directions are common, it is easy to set the operation by the third gripping means and the gripping operations by the first and second gripping means at a predetermined timing.

  In the configuration in which the second gripping means is provided with a second advancing / retracting axis, the outer peripheral pressing member of the second gripping means is rotatable around the second advancing / retracting axis, and the outer peripheral pressing member When attaching to and detaching from the chuck body, it is separated from the front space of the work, and when gripping the work, the outer peripheral pressing member moves around the second advance / retreat axis in conjunction with the movement of the second advance / retreat axis. It is possible to adopt a configuration that rotates and enters the front space of the workpiece from the detached state by the rotation.

  According to this configuration, the outer peripheral pressing member of the second gripping means is detached from the front space of the workpiece when the workpiece is attached to or detached from the chuck body. For this reason, the workpiece can be taken in and out along the central axis from the front side of the chuck body without hitting the outer peripheral pressing member. Accordingly, the work for attaching and detaching the workpiece can be further simplified.

Further, the plurality of gripping claws of the third gripping means may be provided symmetrically facing each other in a direction intersecting the axial direction of the main body portion of the workpiece.
When the workpiece is gripped by the first and second gripping means, the workpiece is in a state in which the main body protrudes laterally from the root portion of the branch-shaped portion. The main body projecting sideways becomes an obstacle when gripping the outer periphery of the branch-shaped portion by the gripping claws of the third gripping means. This is because if the main body portion protrudes in the outer diameter direction of the chuck main body, the gripping claws located on the outer diameter side will not easily approach the branch portion on the inner diameter side.
Therefore, as described above, if the plurality of gripping claws are provided symmetrically facing the direction intersecting the axial direction of the main body of the workpiece, the gripping claws are moved from the outer diameter side to the inner diameter side. And when approaching a branch-like part, a main-body part comes to be unhindered.

  In addition, when the elevation angle of the axial center of the branch-shaped portion is not a right angle with respect to the axial center of the main body portion of the workpiece, for example, when it is an acute angle or an obtuse angle, the main body portion is slightly inclined. One end protrudes forward and is located just to the side of the branch. For this reason, it can be said that the effect of providing the plurality of gripping claws of the third gripping means symmetrically facing the direction intersecting with the axial direction of the main body of the workpiece as described above is higher.

  The present invention makes it possible to hold the workpiece such that the axis of the branch portion of the deformed workpiece is coaxial with the axis of the chuck body while simplifying the structure of the chuck device and the work of attaching and detaching the workpiece as much as possible. it can.

  An embodiment will be described with reference to FIGS. In this embodiment, as shown in FIG. 5, a deformed workpiece W including a shaft-shaped main body w1 having an axis c1 and a shaft-shaped branch w2 having a shaft center c2 branched from the main body w1. It is intended for.

  The elevation angle α of the axis c2 of the branch-shaped portion w2 with respect to the axis c1 of the main body w1 of the workpiece W is along the direction of the axis c1 of the main body w1 from the one end b on the left side in the drawing to the right. An acute angle is formed with respect to the direction toward the other end a. The purpose is to grip the branch c2 so that the axis c2 of the branch portion w2 is coaxial with the center axis D of the chuck body 1.

  As shown in FIGS. 4 and 2, the chuck body 1 has a housing 2 fixed to a back plate 6 via an adapter plate 5, and the adapter plate 5 is attached to the back plate 6 in the space inside the housing 2. The front end of the actuator 4 passing through

  In the actuator 4, a draw bar (not shown) is connected to the connecting portion 4 a at the rear end, and the center axis of the draw bar and the actuator 4 coincides with the center axis D of the chuck body 1 coaxially. The actuator 4 moves forward and backward in the axial direction of the central axis D integrally with the draw bar by the driving force of the draw bar.

  The chuck body 1 is provided with first, second, and third gripping means 10, 20, and 30 that are operated by the advance / retreat of the actuator 4.

  First, the first gripping means 10 has a function of gripping the main body portion w1 in the direction of the axial center c1 of the main body portion w1 across the both ends a and b of the main body portion w1 of the main body w1. .

  As shown in FIG. 2, the main body portion w1 of the workpiece W is placed on a pair of support bases 21, 21 'provided on the front surface of the chuck main body 1 via a mount 3, and the main body portion w1. The end face of the one end b is directed to the end receiving base 11 which is also provided on the front surface of the chuck body 1 via the mount 3. Each of the support bases 21, 21 ′ has a V-shaped groove shape (see FIGS. 3 and 4) so that the main body w 1 can be stably placed.

Further, each of the end surfaces of the one end b has a contact surface in a surface direction perpendicular to the axis c1 of the main body w1, and the contact surface can be brought into close contact with the end receiving base 11. Yes. The contact surface on the end cradle 11 side is inclined by an angle β from an orientation C ′ parallel to the central axis C so as to look up the other end a side (see FIG. 2B). Here, α + β = 90 °.

  The close contact of the workpiece W with the end receiving base 11 can be confirmed by the air detection means 18. The air detection means 18 is adapted to be supplied with gas from the gas supply means provided on the drawbar side through the gas passages 18d, 18c, 18b and 18a shown in FIG. 2, and the end receiving base of the gas passage 18a. When the opening to 11 is closed by the workpiece W, a predetermined atmospheric pressure in the gas passage is detected, and the degree of adhesion of the workpiece W to the end receiving base 11 is confirmed.

Further, a first advance / retreat shaft 13 provided in parallel with the central axis D is provided in a cylindrical unit 19 fixed to the housing 2 of the chuck body 1 so as to advance and retreat along the axial direction. .
The first advancing / retracting shaft 13 is restricted in rotation in the circumferential direction by a guide groove 13a and a protrusion 13b provided in the unit 19 and slidably entering the guide groove 13a.
The first advance / retreat shaft 13 is biased downward (backward in the axial direction) shown in FIG. 1 by a spring 15 locked to the rear end portion 16a, and the advance / retreat thereof is a stopper located in the case 17. The member 16 is regulated within a predetermined range.

In addition, a tapered T-shaped groove 13 c that gradually moves away from the central axis D from the front side to the rear side of the chuck body 1 is formed on the inner peripheral surface of the front end of the first advance / retreat shaft 13. In addition, the unit 19 is provided with an end pressing member 12 having a T-shaped protrusion 12 c that meshes with the T-shaped groove 13 c of the first advance / retreat shaft 13.
The T-shaped protrusion 12 c of the end pressing member 12 is slidably engaged with the T-shaped groove 13 c of the first advance / retreat shaft 13.

When the first advancing / retracting shaft 13 moves axially rearward along the central axis D of the chuck body 1, the end pressing member 12 moves in the direction of the axis c1 in conjunction with the movement of the first advancing / retreating shaft 13. Is moved in a direction to press the other end a of the main body w1 toward the one end b. By this movement, the main body portion w1 of the workpiece W is sandwiched and gripped between the end receiving base 11 and the claw member 12b fixed to the inner end of the end pressing member 12 with a screw 12a. ing.
Further, when the first advancing / retracting shaft 13 moves forward in the axial direction, the end pressing member 12 moves in the direction of the axis c1 in conjunction with the movement of the first advancing / retreating shaft 13. It moves in the direction away from the other end a, and the gripping of the workpiece W is released.

  Next, the second gripping means 20 has a function of sandwiching the outer peripheral portion c of the main body portion w1 of the work W in the radial direction of the main body portion w1 and gripping the main body portion w1 in the radial direction of the main body portion w1. .

As shown in FIG. 3 (a), the second advancing / retracting shaft 23 extends along the axial direction in a sliding hole 27 parallel to the central axis D provided in the housing 2 of the chuck body 1. It can be moved forward and backward. A spring 25 is provided at the rear end portion 26 of the second advance / retreat shaft 23.

  When the workpiece W is attached to and detached from the chuck body 1 and while the end pressing member 12 of the first gripping means 10 is moving, the outer peripheral pressing member 22 is still on the front side of the workpiece W. The position in the plane direction is slightly distant from the front space of the workpiece W, as shown by the chain line in FIG.

  When the second advance / retreat shaft 23 moves rearward in the axial direction along the central axis D of the chuck body 1, the outer peripheral pressing member 22 provided at the front end of the second advance / retreat shaft 23 moves rearward in the axial direction. Then, gradually approach the work W.

At this time, as shown in FIG. 3B, the second advance / retreat shaft 23 has a guide groove 23a bent on the outer periphery thereof, and a projection 23b provided on the housing 2 side in the guide groove 23a. Slidably enters.
For this reason, when the projection 23b passes through the bent portion of the guide groove 23a, the second advance / retreat shaft 23 rotates about the axis, and the outer peripheral pressing member 22 also rotates about the same axis in accordance with the rotation. By this rotation, the outer peripheral pressing member 22 enters the front space of the workpiece W indicated by a solid line in FIG. Thereafter, when the second advancing / retracting shaft 23 further moves rearward in the axial direction, the outer peripheral pressing member 22 presses the front surface side of the outer peripheral portion c of the main body portion w1 to the support base 21 side, and the main body portion w1 is pushed to the support base 21. And the outer peripheral pressing member 22.
Further, when the second advancing / retreating shaft 23 moves forward in the axial direction, the outer peripheral pressing member 22 moves in the reverse direction, and the gripping of the workpiece W is released.
In this embodiment, the balance weight 37 is arranged at a position substantially symmetrical to the second gripping means 20 across the central axis D of the chuck body 1 to ensure the balance when the lathe rotates. .

  Further, the third gripping means 30 chucks the axis c2 of the branch portion w2 on the outer peripheral portion d of the branch portion w2 of the workpiece W by a plurality of grip claws 31 that move in the radial direction of the chuck body 1. It has a function of gripping coaxially with the central axis D of the main body 1.

  As shown in FIGS. 1 and 4, the structure includes a gripping claw 31 around the central axis D of the chuck body 10. In this embodiment, the gripping claws 31 are provided at two locations facing each other across the central axis D, but three or more locations may be provided around the central axis D.

As shown in FIG. 4, the housing 2 of the chuck body 1 is formed with the same number of inclined holes 32 as the gripping claws 31 that gradually spread from the rear to the front toward the outer diameter side. A shaft-shaped master jaw 33 fits snugly. Each gripping claw 31 is attached to the front end of the master jaw 33 toward the inner diameter side, and the master jaw 33 provided with the gripping claw 31 can slide along the length direction of the inclined hole 32. It has become.
Further, a guide groove 33a is formed in the master jaw 33, and the rotation around the axis of the master jaw 33 is restricted by a projection 33b that slidably enters the guide groove 33a.

A third flange portion 34 provided on the outer diameter portion of the actuator 4 engages with an engagement groove 35 provided on the inner diameter portion of the master jaw 33, and the master jaw 33 and the actuator 4 cannot be moved relative to each other in the axial direction. Is bound to.
For this reason, if the actuator 4 moves leftward (backward in the axial direction) shown in FIG. 4, the gripping claw 31 moves radially inward while being pulled slightly rearward from the chain line position in the figure to the solid line position. To do. By this movement, the gripping claws 31 grip the outer peripheral portion d of the branch-shaped portion w2 of the workpiece W.
Further, when the actuator 4 moves in the right direction (forward in the axial direction) shown in FIG. 4, the gripping claw 31 moves in the reverse direction to release the workpiece W.

  The operation of this irregularly shaped workpiece chuck device will be described in order, for example, when the workpiece W is grasped. In the state where the actuator 4 is completely advanced, the first, second, and third gripping means 10, 20, and 30 Each of the workpieces W is in a released state.

That is, the first advancing / retracting shaft 13 of the first gripping means 10 is such that the upper surface of the first flange portion 14 of the actuator 4 shown in FIG. 2 is in contact with the rear surface 16b of the rear end portion 16a. Is pushed upward in the figure. The position of the first advancing / retreating shaft 13 in the pushed state is slightly above the position shown in the drawing and near the upper limit of the advancing / retreating range.
Therefore, the end pressing member 12 is in a state of being separated from the other end a of the main body w1 along the direction of the axis c1 of the main body w1 of the workpiece W.

  Moreover, since the second flange portion 24 of the actuator 4 is slightly above the position shown in FIG. 3A with respect to the second advance / retreat shaft 23 of the second gripping means 20, The position is also a position pushed slightly higher than the position shown in the figure. At this time, the position of the outer peripheral pressing member 22 in the planar direction is in the detached state (see the chain line in FIG. 1).

  Furthermore, the third gripping means 30 is in a state where the gripping claws 31 are separated from the outer peripheral portion d of the branch-shaped portion w2 of the workpiece W (see the chain line in FIG. 4).

  First, the workpiece W is placed on the chuck body 1. While the branch part w2 of the workpiece W is directed forward along the center axis D of the chuck body 1, the body portion w1 of the workpiece W is placed on the support bases 21 and 21 ′, and one end b thereof is It abuts on the end cradle 11. This placement may be performed manually or automatically by a machine.

  When the draw bar is retracted in the axial direction of the central axis D with respect to the chuck body 1, the actuator 4 is retracted together with the first, second and third flange portions 14, 24 and 34.

Of these, the first advancing / retracting shaft 13 that has been pushed out by the first flange portion 14 is retracted in the same direction by the urging force of the spring 15 along with the retreat of the first flange portion 14, and the end pressing member along with the retreat. 12 presses the other end a of the workpiece W toward the one end b, and fixes the main body w1 in the direction of the axis c1.
Note that the positioning of the workpiece W in the direction of the axis c1 is performed in advance according to the shape and dimensions of the workpiece W in accordance with the end receiving base 11, the supporting bases 21, 21 'or the base 21a thereof, and the claw member 12b of the end pressing member 12. Etc. are replaced by replacing them with the appropriate dimensions.

  Further, when the actuator 4 moves backward and the first advance / retreat shaft 13 comes to the lower limit position of the advance / retreat range shown in FIG. 2, the upper surface 14 a of the first flange portion 14 of the actuator 4 moves to the first advance / retreat shaft 13. It leaves | separates from the rear-end part 16a.

  Thereafter, when the actuator 4 is further retracted, the rear surface 24a of the second flange portion 24 pushes the rear end portion 26 of the second advancing / retracting shaft 23 backward via the spring 25 to retract the second advancing / retracting shaft 23. As the second advancing / retracting shaft 23 moves backward, the outer circumferential pressing member 22 provided at the front end of the second advancing / retreating shaft 23 moves rearward in the axial direction and approaches the workpiece W, and the outer circumferential pressing member 22 moves to the second advancing / retreating shaft. It rotates around the axis of 23 and enters the front space of the workpiece W. Thereafter, when the second advancing / retreating shaft 23 is further retracted, the outer peripheral pressing member 22 presses the front surface side of the outer peripheral portion c of the main body portion w1 toward the support base 21 and fixes the main body portion w1 in the radial direction. Thereafter, when the actuator 4 is retracted, the spring 25 is contracted in the axial direction, so that the pressing of the main body w1 by the outer peripheral pressing member 22 is maintained.

  Further, by retracting the actuator 4, the master jaw 33 pulled rearward via the third flange portion 34 and the engagement groove 35 is further pulled rearward. Then, the gripping claws 31 that have moved inward in the radial direction in conjunction with the retraction of the master jaw 33 finally grip the outer peripheral portion d of the branch portion w2 of the workpiece W, and the branch portion w2 is defined as the central axis D. Hold it coaxially.

  At this time, since the gripping claws 31 are provided radially around the central axis D, the gripping claws 31 have their branch portions w2 such that the axis c2 of the branch portion w2 coincides with the central axis D. Correct the position.

  In particular, since the gripping claws 31 are provided symmetrically facing the direction intersecting with the direction of the axis c1 of the main body portion w1 of the workpiece W, the gripping claws 31 grip the branch-shaped portion w2 so that the main body This is effective in correcting the direction of the branch-shaped portion w2 in the vertical direction shown in FIG. 4 by slightly rotating the portion w1 around the axis c1.

  When releasing the grip of the workpiece W, the actuator 4 is gradually advanced to perform an operation opposite to the above, and thus the description thereof is omitted.

As another embodiment, the first advancing / retracting shaft 13 and the end pressing member 12 can be linked by means other than the engagement between the T-shaped protrusion 12c and the T-shaped groove 13c as described above. Other well-known interlocking means for converting the axial movement of the first advancing / retracting shaft 13 into the advancing / retreating movement of the end pressing member 12 in the direction of the axis c1 may be used. For example, a flat taper surface that gradually moves away from the central axis D from the front side to the rear side of the chuck body 1 is formed on the inner peripheral side peripheral surface of the front end of the first advance / retreat shaft 13. An end pressing member 12 having a slidable flat surface is provided on the taper surface of the first advance / retreat shaft 13, and the flat surface of the end press member 12 is attached in a direction to press-contact the taper surface of the first advance / retreat shaft 13. You may force.
Further, the spring 15 for urging the first advance / retreat shaft 13 rearward in the axial direction is omitted, and the first flange portion 14 and the first advance / retreat shaft 13 of the actuator 4 are moved in the axial direction of the central axis D of the chuck body 1. It is also possible to adopt a configuration that moves together.

  In the above embodiment, as the third gripping means 30, the gripping claw 31 is operated via the master jaw 33 fitted in the inclined hole 32 provided in the housing 2, but like the second gripping means 20. A gripping claw 31 is operated by providing an advance / retreat axis that can advance and retreat along the axial direction of the central axis D of the chuck body 1 and interlocking the advance / retreat axis of the advance / retreat axis with the advance / retreat of the actuator 4 in the axial direction You may do it.

In this embodiment, the draw bar is used as means for operating the actuator 4, but a configuration not using the draw bar, for example, a configuration using a cylinder or the like may be used. Further, the advancing / retreating direction of the actuator can be reversed in the front-rear direction as long as it is interlocked with the operations of the first, second, and third gripping means 10, 20, 30.
Also, the present invention can be applied to a workpiece W having an elevation angle α that is an obtuse angle or a right angle.

Front view showing an embodiment (A) is a fragmentary sectional view of FIG. 1, (b) is a partially enlarged view thereof. The principal part enlarged view which shows the structure of a 2nd holding | grip means. The principal part enlarged view which shows the structure of a 3rd holding means. Detailed view of workpiece

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chuck main body 2 Housing 4 Actuator 10 1st holding means 11 End part receiving stand 12 End part pressing member 13 First advance / retreat shaft 14 First flange parts 15, 25 Spring 18 Air detection means 19 Unit 20 Second holding means 21 Support base 22 Outer peripheral pressing member 23 Second advancing / retracting shaft 24 Second flange portion 30 Third gripping means 31 Holding claw 32 Inclined hole 33 Master jaw 34 Third flange portion 35 Engaging groove 37 Balance weight C Center axis W Work w1 Main body Part w2 Branch part a, b End part c, d Outer peripheral part c1, c2 Axis center α Elevation angle β of axis c2 with respect to axis c1 Angle with respect to center axis of end cradle

Claims (5)

A workpiece W having a shaft-shaped main body portion w1 having an axis c1 and a shaft-shaped branch portion w2 branched from the main body portion w1 and having an axis c2 is chucked by the axis c2 of the branch-shaped portion w2. In the chuck device for gripping so as to be coaxial with the central axis D of the main body 1,
The chuck body 1 is provided with first gripping means 10 for gripping the main body part w1 in the direction of the axial center c1 of the main body part w1 across the both ends a and b of the main body part w1 in the axial center c1 direction. the second gripping means 20 for gripping the body portion w1 in a radial direction of the main body portion w1 across the outer peripheral portion c of the main body portion w1 in a radial direction of the main body portion w1 is provided, the central axis of the chuck body 1 A plurality of gripping claws 31 around D, and a third gripping means 30 for gripping the outer peripheral portion d of the branch-shaped portion w2 around the axis c2 of the branch-shaped portion w2 with the gripping claws 31;
The chuck body 1 is provided with an actuator 4 that advances and retreats in the axial direction of the central axis D, and the first gripping means 10 of the main body w1 is moved by moving the actuator 4 in one axial direction of the central axis D. Abuts with both ends a and b in the axial center c1 direction and grips both ends a and b in the axial center c1 direction of the main body w1 , and then further moves the actuator 4 to one axial direction of the central axis D As a result, the second gripping means 20 grips the outer peripheral portion c of the main body portion w1 to fix the main body portion w1 in the radial direction, and then the actuator 4 is moved in the axial direction of the central axis D. The gripping claw 31 of the third gripping means 30 grips the outer peripheral portion d of the branch-shaped portion w2, and the branch-shaped portion is rotated by rotating the main body portion w1 about its axis c1. w2 Chucking device for a deformed work axis c2 grip the workpiece W so that the central axis D and coaxially of the chuck body 1. The first gripping means 10 reaches one end b of the main body w1 to an end receiving base 11 provided on the front surface of the chuck main body 1 and is parallel to the central axis D of the chuck main body 1. When the provided first advance / retreat shaft 13 moves in one axial direction along the center axis D of the chuck body 1, the end pressing member 12 that operates in conjunction with the movement of the first advance / retreat shaft 13 includes the main body The other end a of the portion w1 is pressed toward the one end b, and the main body w1 is sandwiched between the end receiving base 11 and the end pressing member 12, and is gripped.
The second gripping means 20 is provided in parallel with the central axis D of the chuck body 1 while the outer peripheral part c of the body part w1 is directed to the support base 21 provided toward the front surface of the chuck body 1. When the second advance / retreat shaft 23 moves in one axial direction along the center axis D of the chuck body 1, the outer peripheral pressing member 22 that operates in conjunction with the movement of the second advance / retreat shaft 23 is provided on the main body w 1. The outer peripheral part c front side is pressed to the support base 21 side, and the main body part w1 is sandwiched between the support base 21 and the outer peripheral pressing member 22 and gripped.
The first advancing / retracting shaft 13 of the first gripping means 10 and the second advancing / retreating shaft 23 of the second gripping means 20 are moved in the axial direction by moving the actuator 4 in one axial direction of the central axis D. The chuck device for deformed workpieces according to claim 1, wherein   The outer peripheral pressing member 22 of the second gripping means 20 is rotatable around the second advancing / retracting shaft 23, and the outer peripheral pressing member 22 is attached to the workpiece W when the workpiece W is attached to and detached from the chuck body 1. When the workpiece W is gripped, the outer peripheral pressing member 22 rotates around the second advance / retreat shaft 23 in conjunction with the movement of the second advance / retreat shaft 23, The deformed workpiece chuck device according to claim 2, wherein the workpiece W enters the front space of the workpiece W from the detached state.   The plurality of gripping claws 31 of the third gripping means 30 are provided symmetrically facing each other in a direction intersecting the direction of the axis c1 of the main body w1 of the workpiece W. The chuck device for deformed workpieces according to any one of the above.   5. The deformed workpiece chuck device according to claim 4, wherein an elevation angle of an axis c <b> 2 of the branch-shaped portion w <b> 2 with respect to an axis c <b> 1 of the main body portion w <b> 1 of the workpiece W is an acute angle or an obtuse angle.

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