JP2018001371A - Rotary chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely hold a driven side clamp tool after the return to an original position.SOLUTION: A rotary chuck includes: a driving side clamp tool 10 and a driven side clamp tool 11 which clamp a workpiece 3 in an axial direction of a rotation axis 6 on both sides of the workpiece 3; a driving side clamp tool holder 12 and a driven side clamp tool holder 13 which rotatably support the driving side clamp tool 10 and the driven side clamp tool 11 around the rotation axis; rotation driving means 16 which drives the driving side clamp tool 10 to be indexed around the rotation axis; and driven side holding means 19 which holds the driven side clamp tool 11 at an original position when releasing the clamping of the workpiece 3 on the original position side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary chuck that is used when a plurality of machining sites are machined by rotating a workpiece around a rotation axis.

  A rotary chuck is generally used when a plurality of machining parts are machined by rotating a workpiece around a rotation axis. The rotary chuck includes a drive-side clamp tool and a driven-side clamp tool that clamp the workpiece on both sides in the axial direction of the rotation axis, and a drive motor that drives the drive-side clamp tool to be indexable around the rotation axis. After the workpiece is clamped in a cantilevered manner by the drive side clamp tool and the driven side clamp tool, the drive side clamp tool is driven around the rotation axis by the drive motor so that a plurality of machining parts of the workpiece can correspond to the tool. There is one that is indexed and rotated (Patent Document 1).

  Also, in the clamp type, clamps on both sides in the axial direction of the rotation axis clamp the clamped parts in a direction orthogonal to the rotation axis, and clamps on both sides in the axial direction of the rotation axis cooperate. Some of them are clamped by clamping in the axial direction of the rotation axis.

JP-A-6-297222

  Regardless of the clamp type, the rotary chuck can index and rotate the workpiece around the rotation axis if one of the clamps arranged on both sides of the workpiece is driven by a drive motor. Therefore, there is an advantage that the entire structure of the chuck is simple and small, and can be manufactured easily and inexpensively.

  However, in the conventional rotary chuck, after the driven side clamp tool is returned to the original position to release the workpiece clamp, the driven side clamp tool may rotate around the rotation axis. There is a problem that it is difficult to hold.

  This is because the drive side clamp tool and the driven side clamp tool are manufactured according to the shape of the workpiece, so that the weight balance may deteriorate depending on the type of workpiece, and the center of gravity when returning to the original position is the rotation of the clamp tool. It may come to an eccentric position that is eccentric from the center to the side.

  Even in such a case, since the drive side clamping tool is positioned at the original position by the drive motor, there is no problem of rotating from the original position. However, the driven-side clamp is rotatable, and there is no one that controls the rotation like a drive motor. Therefore, in the driven side clamp, if the center of gravity when returning to the original position is located at an eccentric position on the side of the center of rotation, the center of gravity is directly below the center of rotation after the workpiece is released. The driven-side clamp tool may rotate until it reaches the value, and the driven-side clamp tool cannot be held in a certain original position.

  For this reason, the conventional rotary chuck has a large variation in the stop position in the rotational direction of the driven clamp, and the workpiece can be clamped securely if the driven clamp is advanced to the workpiece while the workpiece is clamped. Or problems such as damage to the workpiece or the clamping tool may occur. In addition, when the workpiece cannot be securely clamped, there are problems such as damage to the tool during processing and reduction in processing accuracy.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and it is an object of the present invention to provide a rotary chuck that can reliably hold the driven-side clamp device in the original position and can be structurally simplified. .

  The present invention includes a drive side clamp tool and a driven side clamp tool for clamping a workpiece, a drive side holder and a driven side holder that rotatably support the drive side clamp tool and the driven side clamp tool around a rotation axis, and the drive. In a rotary chuck provided with a rotation driving means for driving the side clamp tool so as to be indexable around the rotation axis, the driven side holding the driven side clamp tool in the original position when the workpiece clamp is released on the original position side. Side holding means are provided.

  The driven side holding means may hold the driven side clamp in the original position by magnetic force. The driven side holding means may be arranged on the opposite side of the driven side clamp with respect to the driven side holder. The driven side holding means has a magnet on one side of the driven side clamping tool side and the fixed holder side arranged opposite to each other in the axial direction of the rotation axis, and a magnetic material capable of being magnetically coupled to the magnet on the other side. Each may be provided. The driven side holding means may be arranged at an eccentric position deviating from the rotation center.

  A driven-side clamp tool holder that supports the driven-side clamp tool, the driven-side holder that supports the driven-side clamp tool holder so as to be movable in the axial direction of the rotation axis, and the driven-side holder in the axial direction of the rotational axis. And a driven plate for driving the clamp, and a connecting plate disposed opposite to the driven-side clamp tool holder in the axial direction of the rotation axis and connecting the driving device for clamping to the driven-side holder. The driven side holding means may be arranged on the opposite end face side of the tool holder and the connecting plate so as to face each other in the axial direction of the rotation axis.

  According to the present invention, since the driven-side holding tool is provided to hold the driven-side clamping tool at the original position when the workpiece clamp is released on the original position side of the rotary chuck, the driven-side clamping tool after the return is provided. There is an advantage that it can be securely held in its original position and can be structurally simple.

It is front sectional drawing of the rotary chuck which shows the 1st Embodiment of this invention. FIG. FIG. It is a front view of the work. It is a top view of the follower side clamp tool. It is a side view of the driven side clamp tool. It is sectional drawing of the follower side holding means. FIG. It is sectional drawing of the driven side holding means which shows the 2nd Embodiment of this invention. The 3rd Embodiment of this invention is shown, (a) is sectional drawing of a driven side holding means, (b) is the same side view. It is sectional drawing of the driven side holding means which shows the 4th Embodiment of this invention. It is a plane sectional view showing a 5th embodiment of the present invention. It is the longitudinal cross-sectional view. It is the longitudinal cross-sectional view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 8 illustrate a first embodiment of the present invention. The rotary chuck 1 of this embodiment is configured as shown in a front sectional view of FIG. 1, a plan sectional view of FIG. 2, and an irregular side sectional view of FIG. 3, and is used for a tool rotating machine tool such as a milling machine or a machining center. It is mounted on a movable table and used when machining a plurality of machining sites in the rotation direction of the workpiece 3 with the tool 2.

  The workpiece 3 is, for example, a 45 ° Y pipe joint. As shown in FIG. 4, the pipe joint includes a main body 4 and a branching portion 5 where the center lines 4 a and 5 a intersect at one point, and there are a plurality of end surfaces, inner diameters, and the like of the main body 4 and the branching portion 5. It is a processing part.

  When machining each machining site of the workpiece 3 having such a plurality of machining sites, the rotary chuck 1 is used to clamp the workpiece 3 and rotate it around the rotation axis 6 while each machining site is moved to the tool 2. The predetermined rotation angle corresponding to is determined.

  As shown in FIGS. 1 to 3, the rotary chuck 1 is disposed on both sides in the axial direction of the rotation axis 6 with respect to the workpiece 3 and clamps the workpiece 3 cooperatively from both sides in the axial direction of the rotation axis 6. Drive side clamp tool 10 and driven side clamp tool 11, Drive side clamp tool holder 12 and driven side clamp tool holder 13 that support drive side clamp tool 10 and driven side clamp tool 11, Drive side clamp tool 10 and driven side A driving side holder 14 and a driven side holder 15 that support the driving side clamping tool holder 12 and the driven side clamping tool holder 13 on the side opposite to the workpiece 3 with respect to the clamping tool 11, and a driving side clamp attached to the driving side holder 14 Rotation drive means 16 that rotates around the rotation axis 6 so that the drive side clamp tool 10 can be indexed via the tool holder 12, and a driven side holder Guide means 18 that guides 5 so as to be linearly movable in the axial direction of the rotation axis 6, and a driven side clamp via a driven side holder 15 and a driven side clamp tool holder 13 along the guide means 18 in the axial direction of the rotary axis 6. The clamp driving means 17 for driving the tool 11 in the axial direction (clamping / unclamping direction) of the rotation axis 6, the driven side holding means 19 for holding the driven side clamping tool 11 at the original position H, and the whole are supported. A mounting base 20 is provided.

  The drive-side clamp tool 10 and the driven-side clamp tool 11 cooperate with each other to clamp and clamp the work 3 from both sides in the axial direction of the rotation axis 6. Clamp portions 21 and 22 formed corresponding to the side shape of the portion 4 and receiving portions 23 and 24 for receiving the work 3 from the lower side below the clamp portions 21 and 22 are provided on the distal end side, and the base side is The drive side clamp tool holder 12 and the driven side clamp tool holder 13 are detachably fixed by fixing tools 25 and 26 such as screws.

  As shown in FIGS. 5 and 6, the clamp portions 21 and 22 are substantially V-shaped in a plan view so that the main body portion 4 of the work 3 can be clamped in the axial direction of the rotation axis 6 from both sides. In addition, the amount of protrusion of the rotation axis 6 in the axial direction is shortened by a dimension A with respect to the opposite side of the branching portion 5 so that the branching portion 5 does not come into contact with the branching portion 5 when the body portion 4 is clamped.

  Accordingly, the center of gravity G of the drive side clamp tool holder 12 and the driven side clamp tool holder 13 from the difference in the protruding amount on both sides of the clamp parts 21, 22 and the receiving parts 23, 24, etc., is as shown in FIG. In the state stopped at the position H, it is obliquely below the rotation center O, and is eccentric by an eccentric amount B in the horizontal direction with respect to the rotation center O.

  The drive-side clamp tool holder 12 and the driven-side clamp tool holder 13 are integrally provided with flanges 27 and 28 and rotary shafts 29 and 30 projecting from the flanges 27 and 28 to the opposite side of the workpiece 3, and the flanges 27 and 28 side. Are supported on substantially the same rotational axis 6 by the driving side holder 14 and the driven side holder 15 via the radial bearings 33 and 34 on the rotary shafts 29 and 30 side, and around the rotational axis 6. It is freely rotatable.

  As shown in FIG. 4, the center lines 4 a and 5 a of the workpiece 3 intersect at the intersection 6 a, and the intersection 6 a is set on the rotation axis 6 of the rotation shafts 29 and 30. Therefore, the workpiece 3 is clamped by the drive side holder 14 and the driven side holder 15, and each machining part rotates to an index angle corresponding to the tool 2 around the intersection 6 a of the center lines 4 a and 5 a.

  The drive side holder 14 is fixed on the mounting base 20. The guide means 18 faces the drive side holder 14 and is fixed on the mounting base 20. The guide means 18 straddles the drive side holder 14 and the fixed holder 35, and the rotation shafts of the clamp tool holders 12 and 13. 29 and 30 and a plurality of guide rods 36 supported substantially parallel to each other, and the driven holder 15 is supported by the guide rods 36 so as to be slidable in the axial direction of the rotation axis 6. The drive side holder 14 and the fixed holder 35 are detachably fixed to the mounting base 20, and the mounting base 20 is detachably fixed to a movable table of the machine tool.

  Two guide rods 36 are arranged on the upper side of the clamps 10 and 11 and one guide rod 36 is arranged on the lower side. The upper two guide rods 36 are arranged between the clamp tools 10 and 11 with a space necessary for attaching and detaching the workpiece 3 from the upper side. The lower guide rod 36 is disposed below the clamps 10 and 11 at the approximate center between the upper two guide rods 36.

  The guide rod 36 has two on the upper side and three on the lower side. However, two guide rods 36 can be arranged on both the upper and lower sides, and the clamps 10 and 11 are sandwiched between the upper and lower directions. You may arrange | position two. The guide means 18 may be any means as long as it can guide the driven side holder 15 in the axial direction of the rotation axis 6, and may be a rod type or a rail provided with a dovetail structure or the like.

  The rotation drive means 16 is constituted by a drive motor 37 such as a servo motor or a stepping motor. The drive motor 37 is detachably mounted on the motor body side on the opposite side of the drive side clamp 14 from the drive side holder 14 via the mounting plate 38, and the drive shaft 39 is inserted into the rotation shaft 29 of the drive side clamp tool holder 12. Are combined.

  The clamping drive means 17 is constituted by a cylinder 40. The cylinder 40 is fixed to the fixed holder 35 on the side surface of the cylinder 40 on the side opposite to the driven holder 15 with respect to the fixed holder 35, and the piston rod 41 passes through the through hole of the fixed holder 35. It extends to the side. The piston rod 41 is connected to the driven holder 15 at the tip end side via a connecting plate 42.

  The connecting plate 42 is disposed on the opposite side of the driven side clamp tool 11 with respect to the driven side holder 15 and close to the end surface of the rotating shaft 30 of the driven side clamp tool holder 13. The outer peripheral side of the connecting plate 42 is detachably fixed to the driven side holder 15 by a fixing tool 43 such as a screw, and the piston rod 41 is connected to the central portion on the opposite side of the driven side holder 15.

  The driven side holding means 19 is for holding the driven side clamp tool 11 so as not to move unstable from the original position H after releasing the clamp of the workpiece 3, and as shown in FIG. When 11 is returned to the original position H, it is arranged on the opposite end face side of the driven side holder 15 and the connecting plate 42 at an eccentric position that is eccentric by the dimension C with respect to the rotation center O of the driven side clamp tool 11. ing.

  As shown in FIGS. 5 and 7, the driven side holding means 19 is fixed to the permanent magnet 45 provided on the connecting plate 42 and the rotation shaft 29 of the driven side clamp tool holder 13, and the driven side clamp tool 11 is A magnetic body 46 that opposes the permanent magnet 45 at the original position H is provided. When the driven side clamp tool 11 is at the original position H, the permanent magnet 45 and the magnetic body 46 are magnetically coupled to each other, and the driven side clamp tool 11. Is magnetically held at the original position H. The permanent magnet 45 and the magnetic body 46 are inserted and fixed in the recesses 47 and 48, and the tip side protrudes to the other side so as to face each other with a slight gap.

  As shown in FIGS. 5 and 7, the opposing end surfaces of the permanent magnet 45 and the magnetic body 46 have substantially the same diameter. However, in FIGS. 6 and 8, the permanent magnet 45 is replaced with the magnetic body 46 for convenience of explanation. Than the larger diameter. Of course, the permanent magnet 45 may have a slightly larger diameter than the magnetic body 46, or conversely, the magnetic body 46 may have a slightly larger diameter than the permanent magnet 45.

  In providing the permanent magnet 45 and the magnetic body 46, the magnetic body 46 may be disposed on the connecting plate 42, and the permanent magnet 45 may be disposed on the rotating shafts 29 and 30 of the driven-side clamp tool holder 13, contrary to the embodiment. Good. It is also possible to employ an electromagnet instead of the permanent magnet 45. However, the permanent magnet 45 can be manufactured more easily and at a lower cost than an electromagnet that requires power supply wiring and the like, and can be reduced in size and incorporated in a narrow space.

  The driving side holder 14 is provided with a cover 52 that covers the rotation driving means 16, and the driven side holder 15 is provided with a fixing holder 35 and a cover 53 that covers the clamping driving means 17. A chip removal cover (not shown) is provided on the mounting base 20 so as to protect the guide rod 36 from the chips generated when the workpiece 3 is processed.

  The machine tool provided with such a rotary chuck 1 is used as follows. The drive side clamp tool 10 is held in the original position H by the drive motor 37 and the driven side clamp tool 11 is held in the original position H by the driven side holding means 19. On the other hand, in the driven side holding means 19, when the driven side clamp 11 is in the original position H, the magnetic body 46 is opposed to the permanent magnet 45 as shown in FIGS. The driven side clamp tool 11 is held at the original position H by the magnetic force acting between the magnetic body 46.

  Accordingly, the driven side clamp tool 10 and the driven side clamp tool 11 are displaced laterally from the rotational center O of the driven side clamp tool 11, but the driven side clamp tool 10 and the driven side clamp tool 11 are processed after the previous work 3 has been processed. If the tool 11 is returned to the original position H, the driven side clamp tool 11 can be held at the original position H by the driven side holding means 19.

  In a state where the drive side clamp tool 10 and the driven side clamp tool 11 are at the original position H, the workpiece 3 to be processed is first loaded onto the drive side clamp tool 10, and then the driven side clamp tool 11 is advanced by the cylinder 40. Then, the driven-side clamp tool 11 comes into contact with the work 3, and the work 3 is clamped in the axial direction of the rotation axis 6 from both sides by the cooperative action with the drive-side clamp tool 10. The workpiece 3 can be clamped. Note that the loading of the workpiece 3 onto the drive side clamping tool 10 may be performed manually or automatically.

  When the workpiece 3 is clamped, the driving side clamping tool 10 is held at the original position H by the driving motor 37, and the driven side clamping tool 11 is brought to the original position H by the driven side holding means 19 having the permanent magnet 45 and the magnetic body 46. Is retained. Moreover, the drive-side clamp tool 10 and the driven-side clamp tool 11 are manufactured so that the clamp portions 21 and 22 correspond to the side shape of the workpiece 3.

  Therefore, the workpiece 3 can be easily and reliably clamped by the drive side clamp device 10 and the driven side clamp device 11 by advancing the driven side clamp device 11 to the workpiece 3 side. It is possible to prevent the side clamp tool 10, the driven side clamp tool 11, and the workpiece 3 from being damaged, and to prevent the tool 2 from being damaged, the processing accuracy from being lowered, and the like.

  When performing the first machining of the workpiece 3 at the original position H, the workpiece 3 may be immediately shifted to machining after the workpiece 3 is clamped. When the machining at the original position H is completed, the workpiece 3 is rotated to the indexing angle I corresponding to the tool 2 as shown in FIG.

  In this case, first, the drive side clamp tool 10 is driven around the rotation axis 6 by the drive motor 37, and the driven side clamp tool 11 is rotated integrally with the drive side clamp tool 10 around the rotation axis 6 via the workpiece 3. Then, the workpiece 3 is indexed to a predetermined angle, and the workpiece 3 is positioned at the index angle.

  While the workpiece 3 is being clamped, the driven side clamp tool 11 is pressed against the drive side clamp tool 10 by the cylinder 40. However, the drive-side clamp tool holder 12 and the driven-side clamp tool holder 13 that support the drive-side clamp tool 10 and the driven-side clamp tool 11 are connected to the drive-side holder 14 and the follower via the thrust bearings 31 and 32 and the radial bearings 33 and 34. Since it is supported by the side holder 15, the driving side clamping tool 10 and the driven side clamping tool 11 in a state where the workpiece 3 is clamped can be smoothly rotated around the rotation axis 6.

  The driven-side clamp tool 11 at the original position H is held by the driven-side holding means 19, but if the driven-side clamp tool 11 rotates around the rotation axis 6, the permanent magnet 45 and the magnetic force of the driven-side holding means 19 are magnetic. The body 46 leaves in the rotational direction as shown in FIG.

  However, since the driven side holding means 19 employs a magnet type that holds the driven side clamp tool 11 at the original position H by the magnetic force acting between the permanent magnet 45 and the magnetic body 46, the drive side clamp tool 10. The rotational force transmitted to the driven side clamp tool 11 from the workpiece 3 can easily release the holding of the driven side clamp tool 11 and rotate the workpiece 3 in the indexing direction without difficulty.

  When the machining of each processing part of the workpiece 3 is completed, the driving side clamping tool 10 is driven to the original position H side by the driving motor 37, and the driving side clamping tool 10, the workpiece 3, and the driven side clamping tool 11 are integrated. To the original position H. Then, the driven side clamp tool 11 is retracted by the cylinder 40 via the driven side holder 15 and the driven side clamp tool holder 13, and the processed workpiece 3 is taken out.

  As described above, when there are a plurality of machining parts in the rotation direction, multi-face machining can be performed while sequentially indexing the workpiece 3 to each machining angle. Therefore, even though there are a plurality of machining parts in the rotation direction, all the machining is possible by simply clamping the work 3 once and then rotating it around the rotation axis 6 of the work 3. Processing can be performed efficiently.

  Therefore, in the case of a workpiece 3 such as a pipe joint in which a plurality of center lines 4a and 5a intersect at one point, the intersection can be set on the rotation axis 6 so that machining can be performed without changing steps. Further, in the case of a machine tool equipped with a tool changer, end face machining and inner diameter machining can be performed simply by exchanging the tool 2, and productivity can be improved.

  Further, there is a driven side holding means 19 between the driven side holder 15 and the connecting plate 42, and when the driven side clamp tool 11 returns to the original position H, the magnetic body 46 of the driven side clamp tool holder 13 is permanently attached to the connecting plate 42. The magnet 45 is attracted by the magnetic force corresponding to the magnet 45. Therefore, even when the driven side clamp tool 11 is returned to the original position H and the center of gravity G is eccentric from the rotation center O, the driven side clamp tool 11 is retracted from the workpiece 3 to release the clamp. The driven side clamp tool 11 can be reliably held at the original position H by the magnetic force acting between the permanent magnet 45 and the magnetic body 46.

  Therefore, when the next workpiece 3 is clamped, the driven-side clamp tool 11 is advanced to the drive-side clamp tool 10 side by the cylinder 40, so that the workpiece 3 is driven by the drive-side clamp tool 10 and the driven-side clamp tool 11. Can be easily and reliably clamped from both sides in the axial direction of the rotation axis 6.

  In addition, the driven side holding means 19 includes a permanent magnet 45 on the coupling plate 42 side and a magnetic body 46 on the rotating shaft 30 side of the driven side clamp tool holder 13, and uses the magnetic force (attraction force) between them to drive the driven side. Since the clamp tool 11 is constituted, the driven side holding means 19 is structurally simple and can be easily and inexpensively used. When the driven side holding means 19 is returned to the original position H, the driven side clamp tool 11 is held, and the driven side clamp tool is used. The holding release when 11 moves from the original position H can be performed smoothly.

  Moreover, since the rotary chuck 1 can be mounted on an existing or existing tool rotation type machine tool (milling machine, machining center, etc.), the equipment cost can be reduced. Furthermore, since there is a driven side holding means 19 and the weight balance after the driven side clamp tool 11 returns to the original position H does not become a problem, the optimally designed driven side clamp tool 11 according to the shape of the workpiece 3 is adopted. Can do. Therefore, it is possible to increase the clamping area according to the shape of the workpiece 3, and the workpiece 3 can be clamped with a larger force with high accuracy.

  In addition, the rotary chuck 1 is also suitable for mass production of small diameter workpieces 3. The pipe joint workpiece 3 includes cheese, cloth, elbow, and the like, and is suitable for machining a small-diameter workpiece 3 having a plurality of machining positions in the rotation direction.

  FIG. 9 illustrates a second embodiment of the present invention. In the driven side holding means 19, permanent magnets 49 and 50 are provided on both the connecting plate 42 side and the driven side clamp tool holder 13 so as to face each other in the axial direction of the rotation axis 6. The permanent magnets 49 and 50 have different magnetic poles on the opposite end side, and an attractive force is generated between them.

  As described above, the permanent magnets 49 and 50 may be provided on both the connecting plate 42 side and the driven side clamp holder 13. The driven side holding means 19 is arranged eccentric with respect to the rotation center O of the driven side clamp 11. Other configurations are the same as the axial direction of the first rotation axis 6.

  FIGS. 10A and 10B illustrate a third embodiment of the present invention. The driven side holding means 19 includes a permanent magnet 45 on the connecting plate 42 side and a magnetic body 46 on the rotary shaft 30 side of the driven side clamp tool holder 13, and a rotation axis passing through the rotation center O of the driven side clamp tool 11. 6 or in the vicinity thereof.

  The permanent magnet 45 and the magnetic body 46 are elongated in the diameter direction of the rotating shaft 30 so as to pass on or near the rotating axis 6 of the rotating shaft 30. The permanent magnet 45 is provided with N poles and S poles at both ends in the longitudinal direction. When the driven clamp 11 is located at the original position H, the permanent magnet 45 and the magnetic body 46 are close to each other on the opposite end face side in a substantially parallel manner.

  Alternatively, the permanent magnet 45 may be disposed on the driven-side clamp holder 13 and the magnetic body 46 may be disposed on the connecting plate 42. In this case, when the driven side clamp tool 11 returns to the original position H, the permanent magnet 45 and the magnetic body 46 approach each other, and the driven side clamp tool 11 stops around the position rotated 180 ° from the original position H. It is necessary not to do. Other configurations are the same as the axial direction of the first rotation axis 6.

  Also in this case, when the driven-side clamp 11 is returned to the original position H, the N pole and S pole of the permanent magnet 45 are close to both end sides of the magnetic body 46, so that the permanent magnet 45 and the magnetic body 46 A magnetic circuit that magnetically couples the two is formed, and the driven side clamp tool 11 can be magnetically held at the original position H by the magnetic force generated between the two.

  In the case of the driven side holding means 19 provided with such a permanent magnet 45 and the magnetic body 46, the driven side holding means 19 can be disposed at a substantially central portion of the driven side clamp tool 11.

  In addition, the permanent magnet 45 and the magnetic body 46 are configured to be long in the diameter direction of the rotary shafts 29 and 30, and the permanent magnet 45 having an N pole and the permanent magnet 45 having an S pole on the side facing the magnetic body 46, The magnetic bodies 46 may be arranged so as to correspond to the respective permanent magnets 45 arranged on both sides in the diameter direction of the rotary shafts 29 and 30. If the distance between the permanent magnets 45 is sufficient, the permanent magnets 45 may be arranged so that the magnetic poles are the same. The driven side holding means 19 including the permanent magnet 45 and the magnetic body 46 can be provided eccentrically with respect to the rotation center O of the driven side clamp tool 11. When the magnetic body 46 is composed of a permanent magnet and the driven side clamp device 11 returns to the original position H, the N pole and S pole of the permanent magnet are close to the N pole and S pole of the permanent magnet 45. It may be.

  FIG. 11 illustrates a fourth embodiment of the present invention. The driven side holding means 19 includes a permanent magnet 45 provided integrally with the connecting plate 42 and a magnetic body 46 on the rotating shafts 29 and 30 side of the driven side clamp tool holder 13. The connecting plate 42 is made of a magnetic material such as iron, and has a protruding portion 45 a protruding toward the magnetic body 46, and a portion of the connecting plate 42 corresponding to the protruding portion 45 a is NS in the axial direction of the rotation axis 6. It is magnetized and magnetized so as to form a magnetic pole. Note that the protrusion 45a may not be provided. Other configurations are the same as those of each embodiment.

  As described above, the permanent magnet 45 can be configured by magnetizing a part of the connecting plate 42 and magnetizing the part. Therefore, when the permanent magnet 45 is provided, it may be either integral or separate.

  12-14 illustrate a fifth embodiment of the present invention. Also in the rotary chuck 1 adopting the clamp type as shown in FIGS. 12 to 14, the driven side holding device 19 similar to each embodiment is provided on the driven side clamp device 11 side, and the driven side clamp device 11 is returned. The original position H can be secured.

  The rotary chuck 1 of FIG. 12 employs a clamp type in which the drive side clamp tool 10 and the driven side clamp tool 11 cooperate to clamp the workpiece 3 in a direction orthogonal to the rotation axis 6 (hereinafter referred to as an orthogonal direction). Yes. The drive-side clamp tool 10 and the driven-side clamp tool 11 include clamp jigs 55 and 56 disposed on both sides in the direction orthogonal to the rotation axis 6 with the workpiece 3 interposed therebetween, and support members that support the clamp jigs 55 and 56. 57,58. The driven side clamp tool 11 has a clamp jig 56 that is slidable in a direction orthogonal to the rotation axis 6 with respect to the support member 58, and a cylinder type or screw type that drives the clamp jig 56 in a direction orthogonal to the rotation axis 6. A driving means 59 for clamping such as the above is provided.

  The clamp jig 56 of the driven side clamp tool 11 may be fixed and the clamp jig 55 of the drive side clamp tool 10 may be moved by the driving means, or the driven side clamp tool 11 and the driven side clamp tool 11 may be moved. Both of the clamp jigs 55 and 56 may be moved by driving means. Accordingly, it is sufficient that at least one of the clamp jigs 55 and 56 is movable in the clamping direction of the workpiece 3 by the driving means.

  When the work 3 is clamped, the clamp jig 56 of the driven side clamp tool 11 is advanced by the clamping drive means 59, and the work 3 is clamped in the direction orthogonal to the rotation axis 6 with the drive side clamp tool 10 as a reference. And clamp.

  The rotary chuck 1 of FIG. 13 employs a clamp type in which the workpiece 3 is separately clamped in the axial direction of the rotation axis 6 by the driving side clamping tool 10 and the driven side clamping tool 11. The drive-side clamp tool 10 and the driven-side clamp tool 11 include a pair of clamp jigs 55 and 56 disposed on both sides in the axial direction of the rotation axis 6 with respect to the workpiece 3, and the pair of clamp jigs 55, Support members 57 and 58 that support 56 in a relatively movable manner in the axial direction of the rotation axis 6, and clamping drive means 60 and 61 that drive each pair of clamp jigs 55 and 56 in the axial direction of the rotation axis 6. And.

  When the workpiece 3 is clamped, the pair of clamp jigs 55 and 56 of the drive side clamp tool 10 and the driven side clamp tool 11 are relatively moved in the axial direction of the rotation axis 6 by the clamp driving means 60 and 61. Thus, the workpiece 3 is separately clamped in the axial direction of the rotation axis 6 by the driving side clamping tool 10 and the driven side clamping tool 11. At this time, the pair of clamp jigs 55 and 56 on both sides of the workpiece 3 may be moved simultaneously in the clamping direction, or one of the pair of clamp jigs 55 and 56 is fixed and the other is fixed. You may move to one side.

  The rotary chuck 1 shown in FIG. 14 employs a clamp type in which the workpiece 3 is separately clamped in the direction orthogonal to the rotation axis 6 by the driving side clamping tool 10 and the driven side clamping tool 11. The drive-side clamp tool 10 and the driven-side clamp tool 11 include a pair of clamp jigs 55 and 56 disposed on both sides of the workpiece 3 to be clamped 62 and 63 in the direction orthogonal to the rotation axis 6, and the pair. Support members 57 and 58 for supporting the clamp jigs 55 and 56 so as to be relatively movable in a direction orthogonal to the rotation axis 6, and a clamp driving means 60 for driving the clamp jigs 55 and 56 in the direction orthogonal to the rotation axis 6. 61.

  Each of the pair of clamp jigs 55 of the drive side clamp tool 10 and the pair of clamp jigs 56 of the driven side clamp tool 11 may be moved in the clamping direction of the workpiece 3. One may be fixed and the other may move to one side. Accordingly, it is sufficient that at least one of the pair of clamp jigs 55 and 56 is movable by the driving means.

  The drive side clamp tool 10 and the driven side clamp tool 11 are detachably mounted on the drive side clamp tool holder 12 and the driven side clamp tool holder 13, and the drive side clamp tool holder 12 and the driven side clamp tool holder 13 are on the drive side. A fixed holder 64 and a driven side fixed holder 65 are rotatably supported around the rotation axis 6. Although the driving side fixed holder 64 is fixed on the mounting base 20, the driven side fixing holder 65 is provided on the mounting base 20 so as to be movable relative to the driving side fixing holder 64 in the axial direction of the rotation axis 6. May be.

  Also in the rotary chuck 1 adopting each of these clamping methods, by providing the driven side holding means 19 similar to each embodiment on the driven side clamp tool 11 side, the original when the driven side clamp tool 11 returns. It is possible to secure the position H. Therefore, the driving side clamping tool 10 and the driven side clamping tool 11 may be ones that cooperate to clamp the workpiece 3 or may clamp the workpiece 3 separately.

  The driven side holding means 19 is provided between the rotating shaft 30 of the driven side clamp tool holder 13 and a support plate 66 fixed to the driven side fixing holder 65. Any one of the first to fourth embodiments can be adopted as the driven side holding means 19.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to this embodiment, A various change is possible. For example, the driven side holding means 19 is exemplified by a magnet type in which a permanent magnet 45 and a magnetic body 46 are combined. However, in addition to the magnet type, the driven side holding means 19 is fixed to the rotation side facing the rotation axis 6 in the axial direction. It may be a mechanical contact type or the like provided with an engaging portion such as a holding recess on one side and an engaging tool detachable from the engaging portion on the other side.

  In short, the driven side holding means 19 can uniformly hold the driven side clamp tool 11 after returning to the original position H at the original position H regardless of whether the weight balance of the driven side clamp tool 11 is good or bad. If it is enough.

  Although a pipe joint is illustrated as the work 3, other than the pipe joint may be used. In the rotary chuck 1, the workpiece 3 to be clamped has a plurality of machining portions in the rotation direction, but it is free to use the workpiece 3 with one machining portion.

  In addition, the drive side clamp tool 10 and the driven side clamp tool 11 of the embodiment are configured such that both work together to clamp and clamp the workpiece 3 from both sides in the axial direction of the rotation axis 6. And the driven-side clamp tool 11 constitute a set of clamping means. However, the present invention can also be implemented in a similar manner to those other than the one in which the driving side clamping tool 10 and the driven side clamping tool 11 cooperate to clamp the workpiece 3.

  The drive-side clamp tool 10 and the driven-side clamp tool 11 are preferably detachably fixed to the drive-side holder 14 and the driven-side holder 15 for replacement according to the workpiece 3. The clamp tool holder 12, the driven-side clamp tool 11, and the driven-side clamp tool holder 13 may be provided integrally.

  When the rotation drive means 16 and the clamp drive means 17 are arranged on the rotation axis 6 or in the axial direction of the rotation axis 6, a drive motor 37 is connected to the rotation drive means 16, and the clamp drive means 17. The cylinder 40 is generally used, but a drive source other than the drive motor 37 and the cylinder 40 may be used.

  Further, the driven-side holding means 19 combines the permanent magnet 45 and the magnetic body 46, for example, the permanent magnet 45 is provided on one of the rotating side (driven-side clamp tool 11 side) and the fixed side facing each other in the axial direction of the rotation axis 6. By providing the magnetic body 46 on the other side, the driven side holding means 19 itself can be structurally simplified. However, it is also possible to arrange the permanent magnets 45 on one of the rotation side and the fixed side of the outer periphery and arrange the magnetic body 46 on the other side in the radial direction inside and outside.

  Further, the driven side holding means 19 is preferably a magnet type. In this case, the driven side clamp tool 11 may be held at the original position H by using a repulsive force in addition to using a magnetic attractive force.

DESCRIPTION OF SYMBOLS 1 Rotary chuck 2 Tool 3 Work piece 6 Rotating axis 10 Drive side clamp tool 11 Drive side clamp tool 12 Drive side clamp tool holder 13 Drive side clamp tool holder 14 Drive side holder 15 Drive side holder 16 Rotation drive means 17 Clamp drive means 19 Driven side holding means 37 Drive motor 40 Cylinder 45 Permanent magnet 46 Magnetic body

Claims (6)

A driving side clamping tool and a driven side clamping tool for clamping a workpiece;
A driving side holder and a driven side holder that rotatably support the driving side clamping tool and the driven side clamping tool around a rotation axis;
In a rotary chuck provided with a drive means for rotation that drives the drive side clamp tool to be indexable around a rotation axis,
A rotary chuck characterized by comprising driven side holding means for holding the driven side clamping tool in the original position when the workpiece clamp is released on the original position side. The rotary chuck according to claim 1, wherein the driven-side holding unit holds the driven-side clamp tool in the original position by a magnetic force. The rotary chuck according to claim 1 or 2, wherein the driven side holding means is disposed on the opposite side of the driven side clamp with respect to the driven side holder. The driven side holding means has a magnet on one side of the driven side clamping tool side and the fixed holder side arranged opposite to each other in the axial direction of the rotation axis, and a magnetic material capable of being magnetically coupled to the magnet on the other side. The rotary chuck according to claim 1, wherein each of the rotary chucks is provided. The rotary chuck according to any one of claims 1 to 4, wherein the driven side holding means is arranged at an eccentric position deviating from the rotation center. A driven-side clamp tool holder that supports the driven-side clamp tool;
The driven side holder for supporting the driven side clamp tool holder movably in the axial direction of the rotation axis; and
Clamp driving means for driving the driven holder in the axial direction of the rotation axis;
A coupling plate disposed opposite to the driven-side clamp tool holder in the axial direction of the rotation axis and coupling the clamp driving means to the driven-side holder;
The rotary according to any one of claims 1 to 5, wherein the driven side holding means is arranged opposite to the end surface of the driven side clamp tool holder and the connecting plate in the axial direction of the rotation axis. Chuck.

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