JPH0641770Y2 - Attachment for rotary chucking used in steel pipe cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rotary chucking attachment for use in a steel pipe cutting machine that quickly changes the pad according to the outer diameter of the steel pipe material.

(Prior Art) Conventionally, when sampling a test piece of a steel pipe, as shown in FIG. 3, the steel pipe 7 is restrained by a rotary chucking attachment 5, the attachment 5 is rotated, and a parting bit 11 is cut into the steel pipe 7. The test piece of the steel pipe 7 was collected. Since the attachment 5 of the rotary chucking device for expanding and contracting the steel pipe 7 with the cut-off bite 11 uses the inner diameter taper portion of the collet ring 12, it is impossible to secure a large stroke.

Therefore, the setup is changed to the collet pad 1 in which the thickness of the collet pad 1 forming the attachment 5 is changed in accordance with the change in the outer diameter of the steel pipe 7.

However, the collet pad 1 is replaced by attaching and detaching the bolts 6, so that there is a problem that the replacement time is long.

(Problems to be solved by the invention) Conventionally, through the chuck from the outside of the collet ring,
Aligning the three bolt holes is a difficult task because the pads are bolted, and it takes a huge amount of time to bolt the five pads one by one. It was a big obstacle to unmanned operation.

Also, automation that makes the robot handle the pad,
Although unmanned operation may be considered, a hydraulic clamp for gripping the pad is required on the rotary chucking device body, and the equipment investment for that is enormous.

(Means for Solving the Problem) The present invention is intended to speed up the pad changeover work in a steel pipe cutting machine at low cost, and the gist thereof is divided into a plurality of parts. The collet chucks are connected by a spring mechanism, and a convex key and a stopper are provided on the inner surface of each collet chuck, dovetail grooves are provided on both ends, and a key groove and a stopper fitting recessed portion on the outer surface and dovetail grooves on both ends are provided. A rotary chucking attachment for use in a steel pipe cutting machine in which a collet pad provided with a convex portion is detachably provided on the collet chuck.

(Operation and Examples) Next, the present invention will be described in detail based on the embodiments shown in the drawings.

1 and 2 show a rotary chucking attachment 5 used in a steel pipe cutting machine.
Each of the divided collet chucks 4 has two dovetail grooves.
In order to prevent the steel pipe material from being scratched, a running material 14 such as urethane rubber is slid on the convex portion 15 of the pad 1 on which the running pipe 14 is applied to assist the work of attaching and detaching the pad 1.

The inner surface of the collet chuck 4 has a key 3 for positioning the rotation direction of the pad 1 and a stopper 2 for supporting the longitudinal direction of the pad 1, and the stopper 2 is connected to the collet chuck 4 by a stopper support pin 8. A spring 9 constantly projects inside the collet chuck 4, and a small-diameter bar material (not shown) is inserted into the hole 10 from the front surface of the collet chuck 4 and the stopper 2 on the outer diameter side is inserted.
Is set to the inner diameter side, the spring 9 is pressed and contracted, the inside of the collet chuck 4 is smoothed, and the pad 1
It is possible to attach and detach.

Next, using the attachment for rotary chucking used in the steel pipe cutting machine, when mounting the pad,
explain.

Insert a small-diameter bar material from the front of the collet chuck 4 through the hole 10 to the outer diameter side of the stopper 2, and then the spring 9
The stopper 2 is rotated around the stopper support pin 8 in the direction of pressing and is fixed so that the stopper 2 does not project inside the collet chuck 4. After that,
The pad 1 is inserted from the front side of the collet chuck 4 using the key 3 fixed to the chuck and the key groove 16 on the outer diameter side of the pad 1 as sliding surfaces.

After the pad is inserted, the bar material fixing the stopper 2 is pulled out, and the stopper 2 projects to the inside of the collet chuck 4 by the reaction force of the spring 9 and fits into the stopper fitting recess 17 on the outer diameter side of the pad 1, The positioning of the pad in the longitudinal direction is completed to enable chucking of the steel pipe material.

In the same manner as for the pad 1 setup change operation, a small-diameter bar material is inserted from the front surface of the collet chuck 4 through the hole 10 into the outer diameter side of the stopper 2, and the stopper 2 is pressed in the direction of pressing the spring 9 to support the stopper support pin 8 Is rotated about the center of the collet chuck 4, and the stopper 2 is fixed at a position where it does not project inside the collet chuck 4.

After that, the pad 1 is moved along the key 3 to the collet chuck 4
The setup change work is completed by removing the pad to the front side, changing the pad to an inner diameter corresponding to the steel pipe material, and performing the mounting work.

When implementing this invention, the dovetail groove fitting portion of the collet chuck 4 and the pad 1 may be provided with a gap of about 0.5 mm in the circumferential direction and the radial direction in order to speed up the attachment / detachment work of the pad 1.

That is, in the chucking of steel pipe material, the force in the circumferential direction of the pad 1 supports the key 3 fixed to the collet chuck 4, and the force in the radial direction is the inner diameter of the collet chuck 4 via the outer diameter surface of the pad 1. Since the surface is supported, the dovetail groove fitting portion has a gap in the circumferential direction and the radial direction, and there is no problem. Although the collet chuck of the present invention is divided into a plurality of pieces and connected by a spring mechanism, the spring mechanism is omitted in the figure for the sake of clarity.

(Effect of the Invention) As described above, according to the rotary chucking attachment used in the steel pipe cutting machine of the present invention, the pad changing operation can be speeded up, and the pad changing time can be significantly shortened. The effect is extremely large.

[Brief description of drawings]

FIG. 1 is a perspective view showing an attachment of the present invention, FIG. 2 is a partially cutaway front view of the attachment of the present invention, and FIG. 3 is an explanatory view showing a conventional attachment for rotary chucking. 1 ... Pad, 2 ... Stopper 3 ... Key, 4 Collet chuck 5 ... Attachment 6 ... Collet mounting bolt 7 ... Steel pipe 8 ... Stopper support pin 9 ... Spring, 10 ... Hole 11 ... Cut-off bite, 12 ... Collet ring 13 ... Dovetail, 14… Lining material 15… Convex part, 16… Key groove 17… Stopper fitting recess

Claims (1)

[Scope of utility model registration request] 1. A plurality of divided collet chucks are connected by a spring mechanism, a convex key and a stopper are provided on the inner surface of each collet chuck, dovetail grooves are provided on both ends, and a key groove and a stopper are fitted on the outer surface. A rotary chucking attachment for use in a steel pipe cutting machine, in which a collet pad having concave portions and convex portions corresponding to dovetail grooves at both ends is detachably provided on the collet chuck.