JPH05304U - Axial positioning device for check - Google Patents

Abstract

(57) [Abstract] [Purpose] Axial positioning device stopper for chucks that can position workpieces even if workpiece dimensions are not uniform. [Structure] A stopper 1 is provided in a chuck 20. The stopper 1 is movably supported by a spring. When the work W is pushed by the pusher 18 and positioned by the stopper 1, even if the size of the work is not uniform, it can be absorbed by the spring 10 so that the amount of protrusion from the chuck can always be constant.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an axial positioning device for a chuck. More specifically, even if the dimension of the work in the axial direction is not uniform, by positioning one end surface of the work, the amount of protrusion from the chuck base can be made constant, and the grinding allowance of the end surface can be made constant. A directional positioning device.

[0002]

[Prior art]

 Since the work is cut by the NC lathe, there are methods of attaching and detaching the work, such as using a robot and manually. After gripping the workpiece on the chuck, in either case, first, the end surface and the outer peripheral surface opposite to the chuck are cut.

For example, when a robot is used, the work is moved from another position by a robot hand between the chuck and the turret, the gripping jaws of the chuck are opened, and then the work is moved in the spindle axis direction to chuck the work. Position in the direction near the gripping claw of. Next, the work end face is pressed and moved to the main shaft side by operating a so-called pusher provided on the turret side. The end surface of the work moves toward the stopper, which is the axial positioning member of the chuck, but eventually contacts the front end surface of the chuck-side stopper. Since the pusher is programmed to stop at a certain pressure or a certain position in advance, the pressure is detected when the end face of the work comes into contact with the tip face of the stopper, the gripping claw is closed and the work is gripped. Returns to the opposite spindle side and stops the operation.

However, in general, the dimension in the axial direction of the work material itself is not uniform, so that the end positions of the work after being gripped and positioned by the chuck are also uneven and the positions of the ends on the opposite main spindle side are also uneven. This means that the cutting allowances are large and small, and they are uneven, and there are various problems when cutting them with tools. In other words, the load on the tool fluctuates due to uneven cutting allowances, and especially when an excessive cutting allowance is expected, it is necessary to create a program for cutting multiple times in advance, and the program becomes long and The processing time also increases. In addition, if the cutting allowance is large, the tool will be overloaded and the life of the tool will be shortened.

[0005]

[Problems to be solved by the device]

 Thus, the present invention was developed through intensive research to solve the above problems, and relates to an axial positioning device for a lathe chuck. That is, even if there is unevenness in the dimension of the workpiece in the axial direction, by positioning one end surface on the cutting side of the workpiece, the dimension protruding from the chuck can be made constant and the cutting allowance of the end surface can be set. is there. Since one end of the work is positioned at a fixed position, the cutting allowance automatically has a fixed width, eliminating the need for wasteful cutting and shortening the processing time. Further, since the cutting allowance has a constant size, it is possible to suppress fluctuations in the load applied to the tool and to extend the life of the tool.

[0006]

[Means for Solving the Problems]

 The following measures are taken to solve the above-mentioned problems.

In a chuck mounted on the base of a machine tool for gripping an object to be gripped with a plurality of gripping claws, a chuck base mounted on the base and an inner peripheral portion of the chuck base so as to be movable in the axial direction. A stopper that is provided to press and support the gripping object in the axial direction when gripping the gripping object; a biasing member that constantly biases the stopper toward the gripping object side with respect to the chuck base; A pusher that is provided so as to be movable in the axial direction so as to face the gripping target, and that when the gripping target is gripped, is brought into contact with the end of the gripping target to perform axial positioning. When gripping the object, when the pusher moves to a predetermined position, comes into contact with the end of the object to be grasped, is pressed and moved to be axially positioned, the object to be grasped has an axial dimension error. Also the above An axial positioning device for a chuck, which is characterized in that it is absorbed by movement of the topper in the axial direction and can be grasped with a constant protrusion amount of the object to be grasped from the chuck base body.

[0008]

[Work]

 Since the present invention is configured as described above, the work is first gripped by the robot hand or the like and moved between the turret and the chuck, and moved to the axis of the main shaft to position the work near the gripping claws. Next, the turret side pusher is moved to the main shaft side. This causes the work to move, and finally comes into contact with the tip of the stopper.

Further, when the pusher is moved, the work is further pushed and one end of the work pushes the head of the stopper. Then, the stopper is movably supported by the spring in the moving direction of the pusher, so that the stopper escapes and moves in the same direction. Eventually, the pusher will stop when it reaches the specified position, so grasp it with the grasping claw.

[0010]

【Example】

 The present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of an axial positioning device for a chuck according to an embodiment of the present invention. The stopper 1 is inserted into the inner diameter portion of the sleeve 2 so as to be movable in the axial direction. The sleeve 2 is attached to the chuck body 3 by a screw 4 on the chuck 1, and a shoulder portion 6 of the stopper 1 abuts against a rear end surface 5 thereof to restrict the movement of the stopper 1 to the right (illustrated). Similarly, an outer cylinder 7 is fixed to the chuck body 3 with a screw 4. An air nozzle 8 is attached to the front end of the outer cylinder 7 with a screw 9. The rear end of the one-way stopper 1 is elastically pressed by the spring 10 in the right direction (illustrated) with respect to the front end of the air nozzle 8. Therefore, the stopper 1 slides while being guided by the inner peripheral surface of the sleeve 2 and the outer peripheral surface of the air nozzle 8.

A passage for air supply is provided inside the air nozzle 8, and its tip is branched into two small passages. A passage is also provided inside the outer cylinder 7, and is continuously connected to the passage of the air nozzle 8. The outer cylinder 7 is connected to an air pipe 11 connected to an air source (not shown). The air flowing from the air pipe 11 passes through the passage inside the outer cylinder 7 and the passage inside the air nozzle 8 and is finally discharged to the outside from the two branched small passages. This air is discharged to blow off chips, cutting oil, etc. existing in the vicinity of the head of the stopper 1 and at the end of the work, so that there is no extraneous foreign matter between the end of the work and the stopper 1. can do. Supply and shutoff of air is done by the command in the NC program.

The chuck body 3 is attached to the end of the main shaft 14, that is, the main shaft end 13 via a face plate 12 with a bolt (not shown). At that time, the positioning is fixed via the positioning button 5 or the like as in the conventional case. On the other hand, a draw tube 16 is provided inside the main shaft 14 so as to be movable in the axial direction. An engaging member 17 is screwed into the tip of the draw tube 16. The wedge portion 22 and the ring 21 are fixed by bolts (not shown) and hold the engaging member 17. A wedge mechanism is formed on the wedge member 22 and the master jaw 23, which is a known wedge-type chuck in which the movement of the draw tube 16 in the axial direction is converted into the movement of the master jaw 23 in the radial direction. I won't explain it in detail. The grip jaws 24 are fixed to the master jaw 23 to grip the work.

[0013]Action  An operation in which the work W is gripped and fixed to the chuck having the above configuration will be described. First, the work W is grasped by a robot hand or the like and moved between a turret (not shown) and the chuck 20 to be positioned on the axis of the spindle 14, and then the robot W is held by the work W on the axis of the spindle in the axial direction. Move it so that it is located near. Next, the left end of the work W is brought into contact with the head of the stopper 1 by moving the turret to which the pusher 18 is attached to the spindle side by a servo motor (not shown). Still further, when the pusher 18 is moved, the work W is further pushed and its left end pushes the head of the stopper 1. Then, since the stopper 1 is movably arranged by the spring 10 toward the main shaft side, it escapes and moves to the main shaft side, and eventually the pusher 18 also stops when it reaches the position input to the program. At this stop, the work W is also stopped at the same time, and thereafter, the draw tube 16 is moved by a driving body (not shown) to move the gripping claws 24 to grip the work W.

[0014]

[Other Examples]

 What has been described above is not limited to the description of the embodiments as long as it is within the scope of the essence of the object of the present invention. For example, the spring 10 may be an elastic member such as rubber or a hydraulic / pneumatic cylinder, and these are fully included in the present invention and are not limited to interpretation.

[0015]

[Effect of the device]

 Even if the lengths of the work W are not uniform, the stopper 1 is corrected by escaping by that amount, variations in the work length are absorbed, and the end portion on the processing side is always positioned at a fixed position. Therefore, as described above, since the right end of the work W is positioned at a fixed position, it is not necessary to create a program that assumes variations, so that the machining time can be shortened. In addition, since the cutting allowance is a fixed size, no excessive load is applied, so the tool life can be extended.

[Brief description of drawings]

FIG. 1 is an enlarged view of a lathe chuck according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Stopper, 3 ... Chuck body, 7 ... Outer cylinder, 10 ...
Spring, 11 ... Air tube, 12 ... Face plate, 13 ... Spindle end, 16 ... Draw tube, 17 ... Engaging member, 18 ... Pusher, 20 ... Chuck, W ... Work piece

Claims (1)

Claims for utility model registration 1. In a chuck mounted on the base of a machine tool for gripping an object to be gripped with a plurality of gripping claws, a chuck base mounted on the base and an inner circumference of the chuck base. And a stopper for movably supporting the object to be grasped in the axial direction when the object to be grasped is grasped, and the stopper is always biased toward the object to be grasped with respect to the chuck base. An urging member and a pusher that is provided so as to be opposed to the chuck base body and is movable in the axial direction, and that, when gripping the object to be grasped, contacts the end of the object to be grasped to perform axial positioning. When gripping the object to be grasped, the pusher moves to a predetermined position, abuts against the end of the object to be grasped, and is pressed and moved to axially position the object to be grasped. Dimensional error An axial positioning device for a chuck, characterized in that even if it is provided, it is absorbed by the movement of the stopper in the axial direction and can be held with a constant protrusion amount of the object to be grasped from the chuck base body.