JP2820996B2 - Lathe chuck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a case in which the outer peripheral surface of a work is grasped by a plurality of chuck claws, and the inner and outer diameters and the end surface of the work and plural holes are accurately turned. It relates to the chuck for the NC lathe to be used.

[Conventional technology]

The workpiece to be turned using the chuck of the present invention is one in which the inner and outer diameters and end faces are turned in advance, and furthermore, a plurality of through holes are equidistant from the center of the workpiece, and are provided at equal intervals and then quenched. is there.

Therefore, distortion due to quenching is conceivable. However, precision requirements for the finish of the inner and outer diameters and the position of the holes after quenching are strict, so that it is necessary to simultaneously process the inner and outer diameters of the work and the hole positions after quenching.

Conventionally, when processing as described above, a guide hole with the same diameter as multiple holes of the work is provided on the stopper provided on the chuck body, a pin that is neatly inserted into the guide hole through the work hole, and the work is chucked. After that, remove the pin, fix it, machine the inner and outer diameter end face with NC lathe, stop the spindle in fixed position, and finish the inner diameter of the hole with the rotating tool.

[Problems to be solved by the invention]

The conventional processing method as described above is extremely troublesome, and the positions of a plurality of holes are likely to be shifted, leaving black scales and the roundness of the finished holes being deteriorated.

An object of the present invention is to provide a chuck capable of turning a workpiece such as described above with high accuracy and efficiency by performing chucking and positioning of the workpiece by driving one draw bar.

[Means for solving the problem]

In order to solve the above-mentioned problem, the present invention provides a plurality of chuck claws on the front surface of a hollow chuck body, and provides an advancing / retreating plate that advances and retreats with a draw bar that is advanced and retracted by an appropriate driving means in a rear portion of the chuck body. Location pins are respectively fixed to the tips of a plurality of advance / retreat rods fixed near the outer periphery of the advance / retreat plate, and are located at the front of the advance / retreat plate in the main body, and advance / retreat within a certain range with respect to the advance / retreat plate. A lathe in which a chuck claw driving member and a spring for pressing the chuck claw driving member are provided in the publication, and the chuck claw driving member and the chuck claw are connected via a function of moving each chuck claw inward when retracted. Provide a chuck for

[Action]

Since the present invention has the above configuration, first, the chuck claw driving member is set to the forward position by the draw bar, each chuck claw is opened, and each location pin is set to the forward position.

In this state, the location pin is inserted into each hole of the work, the shaft of the work is positioned between the chuck claws, and then the drawbar is retracted. At the same time as starting to come out of the work, the chuck claw driving member retreats by the action of the spring, and each chuck claw comes into contact with the outer periphery of the work to be in a temporarily tightened state.

Further, when the draw bar is retracted, the chuck claw driving member is pulled by the draw bar, and each chuck claw strongly grasps the work, and at the same time, the location pin completely comes out of the hole of the work.

In this state, the inner and outer diameters and the end face of the work are turned, then the main spindle of the NC lathe is stopped, and each hole of the stationary work is finished simultaneously by using a rotary tool.

〔Example〕

In the embodiment shown in the drawings, 1 is a chuck body, and 2 is a chuck body.
Is a rear wall fixed to the rear part, and the rear wall 2 is fixed to the main shaft of the NC lathe.

Reference numeral 3 denotes a plurality of chuck claws. The chuck claws 3 are integrally fixed to a front portion of the rod-shaped body 4, and the rod-shaped body 4 can freely advance and retreat to a plurality of inclined holes 5 provided in the front part of the main body 1 so as to extend forward. It is inserted in.

The chuck pawl driving member 6 in the main body 1 has an umbrella shape and its front surface is a surface orthogonal to the center line of each of the inclined rods 4.

A notch 7 is provided from the outer periphery of the drive member 6 at a position corresponding to each chuck claw 3, and the small-diameter shaft 8 at the rear end of each rod 4 is engaged with each notch 7, Locking pieces 9 formed in a T-shape on both sides of the rear end of the small-diameter shaft section 8 are locked on the rear side of the driving member 6, and the chuck members 3 are tilted by the movement of the driving member 6. It is structured to open and close by moving back and forth along the hole 5 in an oblique direction.

The hole 10 at the center of the driving member 6 is slidably fitted to the outside of the reciprocating shaft 12 which is fitted to the central guide hole 11 of the rear wall 2 of the main body 1 so as to be able to reciprocate.

The reciprocating shaft 12 is connected to a drawbar 14,
14 is driven by a hydraulic or air cylinder not shown.

An advancing / retracting plate 15 located behind the driving member 6 is fixed to the advancing / retracting shaft 12. The driving member 6 is disposed between a front surface of a boss 16 of the advancing / retracting plate 15 and a flange 17 on the outer periphery of the advancing / retracting shaft 12. Can freely enter and exit.

Reference numeral 18 denotes a plurality of advance / retreat rods each having a rear end fixed to the front surface near the outer periphery of the advance / retreat plate 15. In the embodiment, three advance / retreat rods 18 are provided at three equally circumferential positions concentric with the main body 1. The member 6 and the hole at the front part of the main body 1 are penetrated so as to be able to advance and retreat, and the tip thereof is connected to the main body 1.
From the front of the camera.

As described above, the mounting bases 20 are detachably fixed to the tips of the respective reciprocating rods 18 protruding from the front surface of the main body 1 with the bolts 21, and the location pins 22 are fixed to the front surfaces of the mounting bases 20, respectively, facing forward.

Protrusions 23 for each chuck claw are provided near the outer periphery of the front part of the main body 1, and the back of each of the rods 4 slides in the guide groove 24 having a semicircular cross section inclined inside each of the protrusions 23. To do it.

Reference numeral 26 in FIG. 1 denotes an axial groove provided in the rod-shaped body
The protrusion at the inner end of the screw 27 is screwed into the groove 26 to prevent rotation.

1, reference numeral 28 denotes a plurality of pressing springs mounted between the inner surface of the front wall of the main body 1 and the front surface of the driving member 6 in a compressed state, and 29 denotes a work stopper fixed to the front center of the main body 1.

Next, the operation will be described. The draw bar 14 advances, the advance / retreat shaft 12 advances, the advance / retreat plate 15 advances, and the unchuck which contacts the chuck claw driving member 6 and advances together. In this state, each chuck claw 3 is open, and the location pin 22 is in the forward state.

A workpiece 30 having a shaft portion a and a flange b in the above-described unchucked state, and having a plurality of holes c formed in the flange b, is moved toward the chuck body 1 with the shaft portion a facing the chuck body 1 and a work stopper. Apply each of the location pins 22 to each of the holes 30 while applying to the holes 29.

Next, when the draw bar 14 is retracted and the integral reciprocating shaft 12 is retracted, the reciprocating plate 15 also retreats together with the respective reciprocating rods 18, so that each location pin 22 starts to fall out from each hole c of the work 30.

When the reciprocating plate 15 starts to retreat as described above, the chuck pawl driving member 6 also retreats by the action of the spring 28, and at the same time, each rod 4 is pulled obliquely inward. Ascertain the portion of a close to the flange b.

At this time, the chuck pawls 3 are temporarily tightened by the force of only the spring 28, and the flange 17 of the reciprocating shaft 12 has not yet contacted the member 6.

When the draw bar 14 further retreats from the above-mentioned position, the flange 17 hits the member 6 remaining at the work temporary tightening position, and the member 6 is forcibly retracted.
Holds 30 strong.

Further, at this time, each location pin 22 comes out of each hole c of the work 30 and is located at a position where the rotary tool for hole finishing does not interfere. The figure shows this chuck state. In this state, the chuck body 1 is rotated, and the outer peripheral front surface and the center hole of the flange b are finished by a finishing tool.

Next, the chuck body 1 is stopped, and the inner surface of each hole c is finished with a rotating tool.

After that, each tool is returned to its original position, the draw bar 14 is advanced, the chuck jaws 3 are released, the work 30 which has been processed is removed, and the location pins 22 are advanced.

〔The invention's effect〕

In the present invention, a plurality of location pins which fit into a plurality of holes of a work at the time of refinishing after turning and quenching as described above are moved forward and backward by a draw bar, and chuck claws for grasping the work are moved forward and backward by a location pin. The work is grasped only by the operation of inserting each location pin into each hole of the work and retracting the drawbar, and the location pin is automatically pulled out of the work hole, making it extremely difficult to attach and detach the work. There is an effect that can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view showing one embodiment of the chuck of the present invention, and FIG. 2 is a front view of the same. 1 chuck body, 3 chuck jaws, 4 rods, 5 slanted holes, 6 chuck jaw drive members, 14 drawbars, 15 reciprocating plates, 18 reciprocating rods, 22 …… Location pin, 28 …… Spring spring.

Claims (1)

(57) [Claims] 1. A plurality of chuck claws are provided on a front surface of a chuck body, and an advancing / retreating plate is provided in a rear portion of the chuck body together with a drawbar which is advanced / retracted by an appropriate driving means, and is fixed near an outer periphery of the advancing / retracting plate. A chuck pin driving member that fixes a location pin to the tip of each of the plurality of advance / retreat rods and is located at the front of the advance / retreat plate in the main body and moves forward / backward within a certain range with respect to the advance / retreat plate; A lathe chuck in which a spring for pushing a driving member backward is provided, and the chuck claw driving member and the chuck claw are connected via a function of bringing each chuck claw inward when retracted.