JPH0580603U - Work gripping attachment - Google Patents

Abstract

(57) [Abstract] [Purpose] A work gripping device is detachably attached to the turret of the facing spindle lathe where two facing spindle heads are fixed, and the Z-axis of the tool rest moves between the two spindle chucks. The work is transferred and fixed to secure the rigidity of the headstock, and at the same time, the Z-axis drive mechanism of the headstock or a work attaching / detaching device such as a robot is eliminated to reduce the cost. [Structure] An attachment main body 14 integrally having a shaft portion to be inserted into a connection hole at a rotary tool mounting position of a turret,
A drive shaft 15 is rotatably provided via a clutch 17 by a rotary tool motor incorporated in the tool post, and is opposed to each other by a bevel gear 16 at the tip of the drive shaft and a pinion 21 rotated via a bevel gear 22. Racks 19A and 19B that are moved in the direction are fixed to the lower surface by gripping claws 18A and 18
B is movably provided along a guide in a direction perpendicular to the drive shaft of the attachment body, and the grip claw is opened and closed by forward and reverse rotation of the motor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work holding attachment to be attached to a turret tool post for transferring a work between both spindle chucks of an opposed spindle lathe having a fixed opposed spindle headstock.

[0002]

[Prior Art]

 Conventionally, in most of the opposed spindle lathes, as shown in FIG. 4, both or one of the headstocks 101 can be moved and positioned in the Z-axis direction, and the work transfer between the two spindle chucks 102 and 103 is performed by the headstocks. It was general to use Z-axis movement.

[0003]

[Problems to be solved by the device]

 The method of moving the headstock 101 by moving the headstock 101 in the Z-axis as described in the prior art has a problem that the headstock rigidity becomes lower when the headstock is moved as compared with the fixed type. When the headstock is used, there is a problem that it is necessary to install a work attachment / detachment device such as a robot outside the machine. The present invention has been made in view of the above problems of the prior art. The purpose of the present invention is not to install a robot or the like outside the machine, but to mount both spindles on a turret. It is intended to provide a simple work gripping attachment capable of transferring a work between chucks.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the work gripping attachment according to the present invention is a work gripping attachment for transferring a work between both spindle chucks of an opposed spindle lathe in which two opposed headstocks are fixed together. The attachment body, which is detachably mounted at the rotary tool mounting position of the turret, is provided with a gripping claw that can be opened and closed within the plane perpendicular to the spindle axis, and the opening and closing of the gripping claw driven by the motor for the built-in tool post A mechanism is provided in the attachment body, and the work is transferred between the two spindle chucks by the Z-axis movement of the tool rest.

[0005]

[Action]

 When the machining of the work on the first spindle chuck side is completed, the turret is rotated and the work grip attachment is indexed to the cutting position. Next, the tool rest moves in the X-axis direction, the center of the gripping claw of the attachment becomes concentric with the first spindle chuck, the tool rest moves toward the first spindle chuck side in the Z-axis direction, and the center of the workpiece grips the attachment. It is inserted in the nail. Then, the gripping claws of the attachment are closed, the first spindle chuck is opened and the workpiece is gripped again, the tool rest moves again to the second spindle head side in the Z-axis direction, and the right end of the workpiece to be gripped is the second spindle. It is inserted into the gripping jaws of the chuck. Next, the gripping claws of the second spindle chuck are closed, the gripping claws of the attachment are opened, and gripping is changed, the tool rest slightly moves to the Z-axis direction first spindle side, and is separated from the work to complete the work transfer. .

[0006]

【Example】

 Examples will be described with reference to FIGS. 1 to 3. The headstock 2 is installed on the left side of the bed 1 of the facing spindle lathe, and the facing headstock 3 is fixed on the right side of the bed 1. A first spindle chuck 4 is fixed to the tip of a spindle rotatably supported by the headstock 2, and a second spindle chuck 5 is fixed to the tip of a spindle rotatably supported by the opposed headstock 3. Two sets of upper and lower Z-axis guides are provided on the bed 1, and a carriage 6 is mounted on the upper Z-axis guide so that the carriage 6 can be moved and positioned. A tool rest 7 is mounted so that it can be moved and positioned. Further, the carriage 8 is also movably positioned on the lower Z-axis guide, and the second tool rest 9 is movably positioned on the X-axis guide on the carriage 8. .

A first turret 11 and a second turret 12 are provided on the first turret 7 and the second turret 9, respectively, so that they can be swivel-indexed around a swivel axis in the Z-axis direction. 11, the second turret 12 has a plurality of tool mounting stations for rotating tools and fixed tools at equal intervals on the side surface, and the work gripping attachment 13 can be attached to and detached from one of the rotating tool stations of the first turret 11. Is attached to. The attachment body 14 of the work gripping attachment 13 has a shaft portion that is inserted into the connection hole of the turret, and the drive shaft 15 is rotatably supported by this shaft portion. The drive shaft 15 has a bevel gear 16 at its tip. The clutch 17 is fitted on the rear end. When the attachment 13 is indexed to the cutting position by turning the turret 11, the clutch 17 is rotated by a motor for a rotary tool (not shown) built in the tool rest 7. The clutch 17 engages with a clutch (not shown) at the tip of the drive shaft in the tool rest. As a result, the drive shaft 15 is driven.

Further, the attachment body 14 is provided with a guide in a direction perpendicular to the drive shaft 15, and the grip claws 18A and 18B are movably placed along the guide. Racks 19A and 19B are fixed to the lower surfaces of the gripping pawls 18A and 18B with their tooth surfaces facing each other, and have a pinion 21 at the tip that is simultaneously meshed with the racks 19A and 19B. A shaft 23 having a rear end of a movable bevel gear 22 meshed with 16 is rotatably supported by the attachment body 14. Therefore, when the pinion 21 is rotated in the normal and reverse directions by the motor, the gripping pawls 18A and 18B simultaneously move in opposite directions by the same amount, and the gripping pawls 18A and 18B are opened and closed while keeping the gripping center constant.

Next, the operation of this embodiment will be described. When the machining of the first step on the front side of the work W gripped by the first spindle chuck 4 is completed, the first turret 11 is rotated and the work grip attachment 13 is indexed to the cutting position. X-axis movement is performed to position the grasping centers of the grasping claws 18A and 18B so as to be concentric with the first chuck 11, the first tool rest 7 is moved to the Z-axis direction first spindle chuck side, and the open grasping is performed. Positioning is performed with the central portion of the work W being inserted into the claws 18A and 18B.

Next, a motor (not shown) built in the first turret 7 is rotated to close the gripping pawls 18A and 18B, and conversely, the gripping pawls of the first spindle chuck 4 are opened, and the first turret 7 is moved in the Z-axis second direction. The movement starts to the spindle chuck side and the state shown in FIG. 2 is reached, and the second spindle chuck 5 is positioned in the state shown in FIG. 3 in which the left end of the workpiece to be grasped is inserted into the grasping claw that is opened. Next, after the second spindle chuck 5 is closed, the motor built in the first turret rotates in the reverse direction, the grasping claws 18A and 18B are opened, and the first turret 7 is slightly moved to the Z-axis first spindle chuck side. After moving to a position away from the work W, the first turret 11 turns, a turning tool (not shown) is indexed to the processing position, and the second step processing on the back side of the work W is started.

[0011]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. Since the work holding attachment is detachably attached to the turret and the work is transferred between the opposing spindle chucks by the Z-axis movement of the tool rest, it is possible to make it a fixed type together with the two head rests. The rigidity of the headstock is improved and powerful cutting becomes possible. In addition, since it is possible to easily transfer workpieces using NC software simply by attaching attachments, large-scale construction is not required and specifications can be easily added to existing facing spindle lathes.

[Brief description of drawings]

FIG. 1 is a perspective view of a work gripping attachment of the present embodiment.

FIG. 2 is a perspective view of an opposed spindle lathe in which a work holding attachment is attached to a turret, and is a view showing a state immediately after a work is removed from a first spindle chuck.

FIG. 3 is a perspective view of an opposed main spindle lathe in which an attachment is attached to a turret from a work holding portion, and is a view showing a state where a work is inserted into a second main spindle chuck.

FIG. 4 is an explanatory diagram of an opposed spindle lathe that transfers a work by moving the Z-axis of one of the spindle stocks according to a conventional technique.

[Explanation of symbols]

1 bed 4 first spindle chuck 5 second spindle chuck 7 first turret 9 second turret 11 first turret 12 second turret 14 attachment body 18A, 18B gripping jaws 19A, 19B
Rack 21 pinion

Claims (1)

[Scope of utility model registration request] 1. A work gripping attachment for transferring a work between both spindle chucks of an opposed spindle lathe in which two opposed spindle stocks are fixed together, and which is detachably mounted at a rotary tool mounting position of a turret. The attachment main body is provided with a gripping pawl that can be opened and closed in a plane perpendicular to the spindle axis, and the attachment main body is provided with an opening / closing mechanism for the motorized drive tool for the rotary tool with a built-in tool post. A work gripping attachment that transfers a work between both spindle chucks by axial movement.