JPH0214154B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube cutting device using a laser beam.

Conventionally, in order to cut a tubular body such as a cathode sleeve, the long tubular body as a material is rotated,
There is a method of cutting this into a predetermined length with a thin blade knife,
A method using electrical discharge machining or a method using a laser beam is used. However, although cutting with a knife can be performed with high efficiency by an experienced person, burrs may occur at the cut portion, and
Since deformation may occur, there is a disadvantage that a processing step is necessary for this, and furthermore, electric discharge machining has a disadvantage in machining speed. On the other hand, the method using a laser beam has a faster processing speed and less deformation, but as shown in Fig. 1, when the tube body 1 is cut by irradiating it with a laser beam, melted protrusions 3 are formed on the inner surface of the cut part. This caused inconveniences such as adhesion and insulation failure when a heater or the like was inserted.
In order to avoid this, for example, as disclosed in Utility Model Publication No. 54-16383, it may be possible to place a metal pad tightly on the inner surface of the tube and irradiate the outer surface of the tube with laser light for cutting. However, there was an inconvenience that the tube body and the pad were often welded together.

The present invention has been made to solve the above-mentioned disadvantages, and includes a rotating mechanism that pivots and rotates a tube body to be cut, and a rotating mechanism that irradiates the outer surface of the pivoted tube body for cutting. a laser oscillation device, and a columnar body having a relief part carved in an axial direction in a spiral shape and having a cutting edge on an outer circumferential surface and slidingly contacting the above-mentioned pivotally supported tube and being driven to be inserted into and removed from the body. It is an object of the present invention to provide a device that is configured to include a positioning mechanism that makes the escape portion correspond to the irradiation optical path of the laser beam, and that removes protrusions generated during laser cutting during cutting.

EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described based on drawings showing examples. Figure 2 shows an outer diameter of approximately 2 mm and a wall thickness of approximately 0.02 to 0.1
This is an embodiment of the present invention in which a cathode sleeve having a size of mm is applied to a tube body 1 to be cut. That is, it has a bed 21, on which a pair of supports 22a and 22b are vertically erected at a predetermined interval. A pair of bearings 23a and 23b are coaxially supported on these supports with their axial directions parallel to the reference plane of the bed 21. A holder 25 having a holding hole 24 having a diameter slightly larger than the outer diameter of the tube body 1 extending therethrough is supported on one bearing 23 a, and a holding hole 24 having a diameter slightly smaller than the outer diameter of the tube body 1 is supported on the other bearing 26 . A holding body 28 formed through the hole 27 is supported pivotally, and the holding holes 24 and 27 are located coaxially with each other. The opposing ends of these holders 25 and 28 are respectively formed into flange parts 29 and 30, and the outer peripheral parts of these flange parts are formed into gears 31a and 31b. Note that O is inside the holding hole 24.
A ring 32 is fitted. Also, bed 21
, the electric motor 3 is connected between the supports 22a and 22b.
3 is provided, and gears 33 are provided at both ends of the rotating shaft.
a and 33b are fixed and mesh with the gears 31a and 31b, respectively. Further, on the bed 21, an air cylinder 40 is mounted on the holding body 28 opposite to the other end side, and the drive shaft 41 is inserted into the holding holes 24, 27.
It is coaxially provided on the pedestal 41. A stopper 42 is fixed to the tip of the drive shaft 41, and a columnar body 45 having approximately the same diameter as the inner diameter of the tube 1 is fixed to the stopper 42 coaxially with the holding holes 24, 27. On the outer circumferential surface of this columnar body 45, a relief portion 46 consisting of a square groove is spirally carved. The edge portion of this relief portion 46 is formed in a cutting blade 47. On the other hand, 50 is a laser oscillation device for processing, and the emitted laser beam 51 is transmitted to a reflecting mirror 5.
2. It is directed through the condensing lens 53 in a direction that intersects the common axis of the holders 25 and 28.

Next, the operation of the above configuration will be explained. In the state before cutting, the columnar body 45 is located outside the holder 28 on the left side of the figure, and the electric motor 33 has stopped rotating. The tubular body 1 is inserted into the holding hole 24 of the holding body 25 from the right side in the figure, and its tip is abutted against the holding body 27 while receiving the elastic force of the O-ring 32. Next, the air cylinder 40 is operated to drive the drive shaft 41, and the columnar body 45 is advanced and inserted into the holding hole 27, and further into the tube body 1. In this insertion, the stopper 42
8, the optical path of the laser beam focused by the condenser lens 53 corresponds to the relief portion 46. After this setup, the electric motor 33 is driven to rotate the holders 25 and 28 synchronously. Along with this rotation, the tube body 1 pressed by the O-ring 32 rotates, but the columnar body 45 remains stationary.
Here, oscillation of the laser oscillation device 50 is started,
The emitted laser beam 51 is focused and irradiates a predetermined cutting site on the outer surface of the rotating tube 1. The tubular body 1 is cut after one rotation. In this cutting, a part of the tube body 1 melts to form a protrusion on the inner surface, but due to the relative rotation of the columnar body 45 and the tube body 1, the relief part 46 carved in a spiral shape The cutting blade 47 cuts and removes the protrusion. Note that the removed chips are carried away downward through the relief portion 46. When the cutting is completed, the columnar body 45
is again moved to the pre-processing position to obtain cut and separated cathode sleeves. In the above embodiment, the tubular body 1 is rotated, but this is a relative rotation, and the columnar body 45 side may be rotated. However, in that case, it goes without saying that the irradiation of the laser beam 51 must also follow the rotation in synchronization.

As detailed above, a columnar body with a helical relief part provided with a cutting edge was inserted into a rotating tube as a pad, and laser cutting was performed by making the laser beam incident on the relief part. The protrusions generated on the inner surface of the tubular body during cutting are removed in synchronization with the cutting, making it possible to efficiently cut the tubular body without the need for post-processing.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a tube explaining cutting of the tube by a laser beam using a conventional device, and FIG. 2 is a cutaway configuration diagram of a main part showing an embodiment of the present invention. . 1... Pipe body, (23a, 23b... Bearing, 25,
28...Holding body, 31...Electric motor) (rotating mechanism),
40... Air cylinder (column drive mechanism), 42
... Stopper (positioning mechanism), 45 ... Column body,
46... Relief portion, 47... Cutting blade, 50... Laser oscillation device.

Claims (1)

[Claims] 1. A rotation mechanism that pivots and rotates the tubular body to be cut, a laser oscillation device that irradiates the outer surface of the pivoted tubular body to cut it with a laser beam, and a spiral shape on the outer peripheral surface in the axial direction. a columnar body having a relief portion carved with a cutting edge and slidably in contact with the pivotally supported tube body and driven to be inserted and removed; and the relief portion and the irradiation optical path of the laser beam are made to correspond to each other. A tube body cutting device using a laser beam, characterized in that it is equipped with a positioning mechanism.