JPS5820722B2 - automatic chuck device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic chuck device for holding a workpiece having two axially spaced conical reference surfaces.

In order to process a workpiece that requires concentricity with respect to the conical reference surface, it is necessary to hold the workpiece at this conical reference surface.

Conventionally, a chuck device having a configuration as shown in FIG. 1 has been employed for machining such a workpiece.

1 is the chuck device main body, 2 is a clamp rod, 3 is a cylinder for operating the clamp rod 2, and 4 is the first part of the workpiece W.
A receiver that receives the conical reference surface S, and the chuck device main body 1
It is provided protrudingly concentrically with the axis of rotation.

5 is a clamp abutment that comes into contact with the second conical reference surface S2 of the workpiece W, and has a U that is slightly larger than the outer diameter of the clamp plot 2.
A letter-shaped cut 5a is formed in the radial direction.

Reference numeral 6 denotes a nut fixed to the tip of the clamp rod 2. When the clamp rod 2 is retracted, the nut 6 engages with the clamp stopper 5, and the workpiece W is held under pressure between the receiver 4 and the clamp stopper 5. It is supposed to be done.

In such a configuration, although clamp-unclamping can be performed automatically, in order to attach and detach the workpiece, the operator must attach and detach the clamp stopper 5 from the clamp rod 2 in the radial direction, and the workpiece must be attached to and detached from the clamp rod 2 at the conical reference plane. This has caused the inability to automate the loading and unloading of workpieces into and out of the chuck device that holds the workpieces.

In order to eliminate such conventional drawbacks, the present invention is designed to automatically release the connection between the clamp butt and the clamp rod and to automatically carry the clamp butt into and out of the workpiece cone reference plane. I will explain based on this.

In Fig. 2, 10 is a headstock in a vertical lathe, etc.;
12 is a chuck device main body fixed to the end surface of the main spindle 11, and 13 is provided protruding from the upper end surface of the chuck device main body 12, and 13 is a vertical main shaft rotatably supported on this headstock. A receiver having a tapered receiving surface 13a at the tip for receiving S1 (the conical surface of the bearing outer ring press-fitted into the inner peripheral surface of the boss), the tapered receiving surface 13a being formed concentrically with the rotational axis of the main shaft 11. has been done.

Reference numeral 14 denotes a lamp rod which is slidably inserted into a through hole 13b formed in the center of the support 13, and this clamp rod 1.
A cylindrical member 15 is integrally formed at the lower end of the cylindrical member 4, and a sliding member 16 having a spring seat 16a is fitted into an inner hole 15a of the cylindrical member 15.

A spring 1 is provided between the sliding member 16 and the cylindrical member 15.
7 is compressed and inserted, and the main shaft 11 is inserted into the sliding member 16.
A piston rod 20 of a cylinder 18 bored in the cylinder 18 is connected to the piston rod 20 .

Further, on the upper surface of the lower flange portion 16b of the sliding member 16, a cylindrical body 21 having a spring seat 21a at the upper end is erected.

A ring-shaped spring receiver 22 is fitted around the cylindrical body 21, and a spring 23 is compressed between the spring receiver 21a and the spring receiver 21a.

24 is an L-shaped clamp arm pivotally supported on the protrusion 12a of the chuck device main body 12;
One end 24a is pressed against the upper surface of the flange portion 16b of the sliding member 16 by a ring-shaped spring receiver 22.

The other end of the clamp arm 24 is provided with a stopper 24b that comes into contact with the outer peripheral surface of the workpiece W.

A pair of clamp claws 25 are pivotally supported at the upper end part 26 of the clamp rod 14, and both ends of a sink spring 27 are engaged with the pair of clamp claws 25, and protrude in the radial direction from the outer peripheral surface of the clamp rod 14. energized to
Clamp rod 1 against the bracket sink spring 27
It can be retracted into the diametrical groove 14a of No. 4.

Reference numeral 28 denotes a clamp stopper having a tapered surface 26a that comes into contact with the second conical reference surface S2 of the workpiece W (the conical surface of the bearing outer ring press-fitted into the inner peripheral surface of the boss).
has an inner hole 28b into which the tip of the clamp rod 14 is fitted.
is formed, and an engaging step portion 28c with which the clamp claw 25 engages is also formed.

A large diameter sleeve 29 that comes into contact with the end surface of the workpiece is slidably fitted on the outer periphery of the clamp butt 28.
A small-diameter sleeve 30 for retracting and retracting the clamp claw 25 is slidably fitted on the inner periphery of the clamp claw 8 .

The large diameter sleeve 29 and the small diameter sleeve 30 are integrally connected by a pin 31, and a spring 33 is compressed between the closure body 32 fixed to the upper end surface of the clamp butt 28.

A protrusion 34 is provided on the closure body 32 in a protruding manner, and a locking groove 34a is carved therein to be gripped by a gripping device 41, which will be described later.

Reference numeral 40 denotes an operating device for carrying in and out the clamp stopper 28 with respect to the second conical reference surface S2, and this operating device 40 is connected to the protruding portion 34 of the clamp stopper 28 as shown in FIGS. 3 and 4.
a gripping part 41 for gripping, a pilot par 42, a guide sleeve 43, and a fluid pressure cylinder 44 as a driving device.
It is composed of.

The guide sleeve 43 and the hydraulic cylinder 44 are provided on a support bracket 46 protruding from the fixed part 45, and the center of the guide sleeve 43 is arranged on the same line as the axis of the main shaft 11.

The grip part 41 connected to the lower end of the pilot par 42 is formed with an inner hole 47 that fits into the protrusion 34 of the clamp stopper 28, and a retaining pin 48 is inserted into the inner hole 47 from the radial direction by a spring 49. It protrudes and elastically engages with the locking groove 34a.

As shown in FIG. 4, a piston rod 51 of a fluid pressure cylinder 44 is attached to a connecting plate 50 that protrudes laterally from the gripping portion 41.
are connected, and the grip part 41 is moved up and down by switching the fluid supply and discharge.

A confirmation pin 52 that responds to the presence or absence of the clamp abutment 28 is fitted into the gripping portion 41, and is biased toward the clamp abutment 28 by a spring 53.

This confirmation pin 52 compresses the spring 53 and is pushed upward when the clamp stopper 28 is held by the gripping part 41, and falls downward when it is separated from the gripping part 41.

With this, the dog 52a protruding from the confirmation pin 52 turns on and off the limit switch to confirm the presence or absence of the clamp stopper 28 when the gripping portion 41 is located at the rising end.

The operation based on the above configuration will be explained next.

When carrying the workpiece W into the chuck device, the clamp stopper 28 is held by the gripping part 41, and the clamp rod 14
It is located at the rising edge away from the

From this, the workpiece W is positioned concentrically with the clamp rod 14 and lowered, so that the first conical reference surface S is seated on the receiver 13.

When the clamp claw 25 comes into contact with the inner circumferential surface of the workpiece W, it is appropriately retracted to allow the workpiece W to pass therethrough.

Thereafter, the grip part 41 is lowered by the operation of the cylinder 44, and the clamp stopper 28 is brought into contact with the second conical reference surface 2□ of the workpiece W.

In this case, the small-diameter sleeve 30 is pushed downward by the pressing force of the spring 33 and descends with its tip surface in contact with the engagement step 28c of the clamp stopper 28, so that the clamp claw 25 It is retracted on the inner peripheral surface of 30.

When the distal end surface of the large diameter sleeve 29 comes into contact with the end surface of the boss portion of the workpiece W, the spring 33 is compressed and moves relative to the clamp abutment 28, and the engagement step between the distal end surface of the small diameter sleeve 30 and the clamp abutment 28 28b are separated to form a gap.

Thereafter, when the cylinder 18 is actuated and the clamp rod 14 is lowered, the clamp claw 25 is expanded by the action of the spring 27 at a position corresponding to the gap, engages with the engagement step 28c, and moves the clamp butt 28 into the second conical shape. Press against the reference surface S2.

With this, the receiver 13 and the clamp stopper 28 are moved to the first and second conical reference planes S0. S2 is clamped and the work W is held concentrically.

At the same time, the clamp arm 24 is also operated, and the work W
The outer circumferential surface of is pressed and held via a spring 23.

When the cylinder 44 is moved upward, the clamp stopper 28
The gripping portion 41 rises leaving behind, and the absence of the clamp stopper 28 is confirmed at the rising end.

This causes the main shaft 11 to rotate, and the inner circumferential surface of the workpiece W is machined.

When the force is completed, the grip portion 41 descends again and grips the clamp stopper 28.

When the clamp rod 14 is raised, the clamp claws 25 are retracted to be in an unclamped state.

When the grip part 41 is raised, the clamp stopper 28 is raised, but the large diameter and small diameter sleeves 29, 30 remain stationary because they are pressed against the end surface of the work W by the spring 33.

As a result, the gap between the engagement step portion 28b and the distal end surface of the small-diameter sleeve 30 is reduced.

When the gap is eliminated, the large diameter and small diameter sleeves 29, 30 are lifted up together with the clamp stopper 28.

As a result, the clamp claw 25 remains retracted, allowing the clamp stopper 28 to rise.

When the gripping part 41 reaches the rising end, it is confirmed by the confirmation pin 52 that the clamp stopper 28 is present, and the processed workpiece W is carried out and the unprocessed workpiece is carried in.

After that, the above operation will be repeated. As described above, according to the present invention, it is possible to automate the connection release between the clamp butt and the clamp rod that are in contact with the second conical reference surface, as well as the loading and unloading of the clamp butt with respect to the second conical reference surface. This has the advantage that tasks that could not be done without manual labor can now be done without manual labor, and work efficiency can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a chuck device showing a conventional example, FIG. 2 is a vertical cross-sectional view of main parts of a chuck device showing an embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view of a clamp stopper operating device. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. 10... Headstock, 11... Main spindle, 12
...Chuck device body, 13...Brace, 14...Clamp rod, 18...
Cylinder, 20...Piston rod, 24...
... Clamp arm, 25 ... Clamp claw, 28 ... Clamp butt, 29 ... Large diameter sleeve, 30 ... Small diameter sleeve, 33・・・
...Spring, 34...Protrusion, 40.
... Clamp dowel operating device, 41 ... Grip section, 42 ... Pilot bar, 43 ...
...Guide sleeve, 44...Cylinder, 48.
...Engagement pin, W...Work 1. Sl・
...First conical reference surface, S2... Second conical reference surface.

Claims (1)

[Scope of Claims] 1. In a chuck device for holding a workpiece having first and second conical reference surfaces spaced apart in the axial direction and concentric, the first conical reference surface is fixed to the chuck device main body concentrically with the rotation axis.
a receiver for receiving the conical reference surface of the receiver, a clamp rod slidably guided through the center of the receiver, and a clamp rod connected to the clamp rod for actuating the clamp rod to a clamping position and an unclamping position. a power device which is pivotally supported on the tip of the clamp rod and which protrudes in the radial direction and is retractable; and a lamp claw which is connected to the clamp rod by engaging with the clamp claw and which is connected to the clamp rod by retraction of the clamp claw. A clamp stopper that is removable and comes into contact with the second conical reference surface, and a grip that detachably grips the clamp stopper, and the clamp stopper is carried into the second conical reference surface, and An automatic chuck device comprising: a lamp dowel operating device capable of moving forward and backward along the axis of rotation for unloading; and a drive device that moves the operating device forward and backward. 2. The clamp stopper has an engagement step with which the clamp claw engages, and a sleeve body that is slidably guided so as to be able to come into contact with and separate from the engagement step and retract the clamp claw, and the sleeve body 2. The automatic chuck device according to claim 1, wherein the chuck is separated from the engaging step portion by a predetermined amount only when the chuck comes into contact with the end surface of the workpiece.