JPH0112888Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a cutting device for a long workpiece that moves in the axial direction while rotating.

[Prior art]

BACKGROUND OF THE INVENTION As a flexible pipe connected to an automobile muffler, a metal strip is formed into a predetermined cross-sectional shape by roll forming, and then helically wound to form a cylindrical pipe. Since such a pipe is continuously rotated and sent out at a constant speed, it is cut to a predetermined size while moving.

FIG. 1 is a block diagram showing this type of workpiece cutting device. In the drawings, reference numeral 1 denotes a rotatably moving workpiece, which is rotatably chucked by a chuck device 2 that moves at the same speed, and is cut with a dimension l by a fusing torch 3 that moves at the same speed. Second
The figure is a sectional view showing a conventional chuck device. A workpiece 1 is inserted into a conical collet 4 having a large number of slits 4a, chucked by tightening the collet 4 with a sleeve 5, and rotatably supported by a bearing 6. .

However, such conventional cutting devices have drawbacks such as being expensive due to the complicated structure of the collet, requiring a long time to manufacture, and requiring dimensional accuracy of the workpiece.

[Purpose of invention]

This invention is intended to solve the above-mentioned drawbacks, and has a simple structure by moving at least one bearing out of at least three bearings each having a space for the workpiece to pass through in a direction intersecting the axis of the workpiece. It is an object of the present invention to provide a chuck device for a rotatably moving workpiece, which can chuck a long workpiece that is rotatably moving, is easy to manufacture, and does not require dimensional accuracy of the workpiece.

[Structure of the idea]

This invention includes at least three bearings each having an inner ring having a workpiece insertion space for inserting a workpiece that moves in the axial direction while rotating, and an outer ring supported by the device body, and at least one of these bearings on the inner side. A chuck device comprising a moving mechanism that chucks a workpiece in a rotating state by relatively offsetting one bearing in a direction intersecting the axis of the workpiece with respect to another bearing, and a chuck device and a means for cutting the workpiece. A cutting device for a rotatably moving workpiece, comprising a moving base that moves at the same speed as the workpiece, with the following parts attached at predetermined intervals.

[Example of idea]

This invention will be explained below with reference to illustrated embodiments.
FIG. 3 is a perspective view of a workpiece cutting device equipped with a chuck device according to an embodiment of the invention, FIG. 4 is a sectional view of the chuck device, and FIG. 5 is a sectional view taken along line A-A of the chuck device.
FIG. 6 is a sectional view showing the operating state, and FIG. 7 is a relationship diagram of the inner diameter thereof, and the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts.

Work 1 is a roll-formed metal strip 7 sent in the direction of arrow a, partially polymerized and wound helically to form a cylindrical shape.
While rotating in the direction shown in FIG. This work 1
A chuck device 2 and a welding torch 3 are mounted on a base 9 moved by an air cylinder 8.
are attached at predetermined intervals on the top.

The chuck device 2 has three bearings 11, 12, and 13 arranged side by side in the device body 10, and has workpiece insertion spaces 11a, 12a, and 1, respectively.
Outer rings 11d, 12d, 1 supported by the device main body 10 via inner rings 11b, 12b, 13b having 3a and bearing receivers 11c, 12c, 13c.
It has 3d. Of these, the center bearing 1
2 is slidable by a guide 14 in a direction perpendicular to the axis of the workpiece 1, and is connected to a rod 16 of an air cylinder 15. In addition, replaceable rings 11e, 12e, 13e that can be attached to the respective inner rings 11b, 12b, 13b are inserted into the workpiece insertion spaces 11a, 12a, 13a of each bearing, and the actual The workpiece insertion spaces 11a, 12a, and 13a are limited.

In the above configuration, when the roll-formed metal strip 7 is supplied to form the workpiece 1, the workpiece 1 is continuously fed out at a constant speed while rotating, and the workpiece insertion spaces 11a, 12a of the bearings 11, 12, 13, 13a. When the air cylinder 15 of the chuck device 2 is driven when the workpiece 1 has been sent out by a certain distance, the central bearing 12 moves as shown in FIG. 6 and is deviated from the other bearings 11 and 13. Work 1 is checked. At this time, as the workpiece 1 rotates, the inner rings 11b, 12b, and 13b also rotate. Inner diameter of each ring 11e, 12e, 13e and workpiece 1
The relationship between the outer diameters is shown in FIG.

When the chuck device 2 chucks the workpiece 1,
The base 9 fixed to the chuck device 2 and the fusing torch 3 also move in the c direction as the work progresses. At this time, the base 9 may be driven at the same speed by the air cylinder 8, or the base 9 may be moved by the propulsive force of the workpiece 1. Since the workpiece 1 rotates during these movements, when an arc is generated from the fusing torch 3, the workpiece 1 is cut to a predetermined size.

When the air cylinder 15 is returned after cutting, the bearing 12 returns to its original position and the chuck is released, so the air cylinder 8 is driven to return the chuck device 2, fusing torch 3, and base 9 to their original positions. Then, with the workpiece 1 extruded to a predetermined size, the chuck device 2 is used again to check the workpiece 1, and the above operation is repeated. When checking a workpiece 1 having a different outer diameter, the rings 11e to 13e are replaced and the same operation is performed.

When chucking the workpiece 1 with the chuck device 2, the inner bearing 12 is displaced relative to the outer bearings 11 and 13, so that the workpiece 1
Even if there is variation in dimensional accuracy in the outer diameter, the variation can be absorbed and the workpiece 1 can be reliably checked and moved. Also ring 11e~
13e is easy to manufacture and install, and can be easily replaced when worn. In addition, for workpieces 1 with different outer diameters, rings 11e to 13
This can be easily resolved by simply replacing e.

In the above embodiment, the inner bearing 12 is moved, but in order to deviate the inner bearing 12 relative to the other bearings 11 and 13, the inner bearing 12 must be moved.
may be fixed and the outer bearings 11 and 13 may be moved. Also, the number of bearings should be at least three. Furthermore, in the above embodiment, the rings 11e to 1
Although the workpiece 1 is chucked by the inner rings 11b to 13b, it may be chucked directly by the inner rings 11b to 13b. Further, the cutting means is not limited to the fusing torch 3, but may be a cutter or the like.

[Effect of idea]

According to this invention, the workpiece is chucked by deflecting at least three bearings, so it is possible to chuck a long workpiece that rotates with a simple structure, and it is easy to manufacture and replace, and the workpiece size Accuracy is not required.

The workpiece is sent out in the axial direction of the workpiece at a predetermined speed while rotating, and the moving mechanism is configured to deviate at least one inner bearing among the at least three bearings relative to the other bearings. By relatively moving the workpiece, it is possible to chuck the workpiece and prevent relative movement between the chuck device and the workpiece in the axial direction of the workpiece. In this state, the chuck device moves the workpiece at the same speed in the direction of movement. Since it is movable, there is no problem in feeding the workpiece.

In addition, since the chuck device is composed of a plurality of bearings having an inner ring having a workpiece insertion space and an outer ring supported by the device body, at least one of the inner bearings among the at least three bearings is Even if the chuck is moved relative to the bearing so as to prevent the relative movement of the chuck device and the workpiece in the axial direction of the workpiece, the workpiece is still rotatable due to the bearing. There is no problem in rotating the workpiece.

Furthermore, in the present invention, the chuck device and the cutting means as described above are attached to the moving base at predetermined intervals and move, so even if the workpiece is rotated and fed out in the axial direction of the workpiece at a predetermined speed, the chuck device and the cutting means as described above are moved. can be chucked firmly and stably without any influence, and while moving in this state, the rotating workpiece can be cut at a predetermined position by a cutting means installed at a predetermined distance from the chuck device. be able to.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a workpiece cutting device, Fig. 2 is a sectional view of a conventional chuck device, Figs. 3 to 7 show an embodiment of this invention, and Fig. 3 is a perspective view of the cutting device. , FIG. 4 is a sectional view of the chuck device,
FIG. 5 is a sectional view taken along the line A-A, FIG. 6 is a sectional view showing the operating state, and FIG. 7 is a diagram showing the relationship between the inner diameters. In each figure, the same reference numerals indicate the same or equivalent parts, 1 is the workpiece, 2 is the chuck device, 3 is the fusing torch, 8 and 15 are the air cylinders, 11 to 13 are the bearings, 11a to 13a are the workpiece insertion spaces, 1
1b to 13b are inner rings, 11d to 13d are outer rings, 1
1e to 13e are rings, and 14 is a guide.

Claims (1)

[Claims for Utility Model Registration] (1) At least three bearings having an inner ring having a workpiece insertion space through which a workpiece that moves in the axial direction while rotating, and an outer ring supported by the device body, and these bearings. A chuck device comprising a moving mechanism that chucks a workpiece in a rotating state by relatively offsetting at least one inner bearing in a direction intersecting the axis of the workpiece with respect to other bearings; 1. A rotationally moving workpiece cutting device comprising a moving base that moves at the same speed as the workpiece, with the device and a workpiece cutting means attached at a predetermined interval. (2) The cutting device according to claim 1, wherein the workpiece insertion space is formed by an exchangeable ring attached to the inner ring of the bearing. (3) The cutting device according to claim 1 or 2, wherein the workpiece insertion space has an inner diameter slightly larger than the outer diameter of the workpiece.