JP2014121726A - Resin coating removal system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a resin coating by a constant width along an outer peripheral surface of a resin-coated metal pipe while moving the metal pipe.SOLUTION: A resin coating removal system 10 includes: transfer means which moves a resin-coated metal pipe 12 at a constant speed in a constant direction; a laser oscillator 20; a plurality of laser heads 14; a plurality of light guide paths 16 which are in one-to-one correspondence with the laser heads 14; a galvanic unit 18 which distributes a laser beam L emitted from the laser oscillator 20 to a first reflection mirror 24 of each light guide path 16; and a control device 22 which controls a deflection angle of the galvanic unit 18 every time when a part to be processed A set on the resin-coated metal pipe 12 reaches an irradiation region of each laser head 14 so that the laser beam L reaches a first reflection mirror 24 of the corresponding light guide path 16, and makes the laser oscillator 20 emit the laser beam L.

Description

  The present invention relates to a resin coating removal system, and more particularly, to a technique for removing a resin coating applied to the surface of a metal tube or a metal wire with a predetermined width along an outer peripheral surface.

In the case of a metal pipe having a protective resin coating on the surface, it is necessary to remove a part of the resin coating for joining with other members.
Conventionally, as a technique for removing a resin coating applied to the surface of a metal tube or wire, as shown in Patent Document 1, a peeling roll having a blade formed on the side periphery is pressed against the surface of the resin-coated metal tube. Some have caused the resin coating to peel off by rotating.
Alternatively, as shown in Patent Document 2, there has been a technique for removing the resin coating in a necessary shape by irradiating the surface of the resin-coated metal tube with a laser beam and scanning it in a grid pattern.

JP2008-0297768 JP-A-2005-224861

  However, in the conventional resin coating removal technology, it is necessary to perform pressing and rotation of the peeling roll with the resin-coated metal tube stationary, or to perform scanning with a laser beam. There was a problem of lacking.

  The present invention has been devised to solve such a conventional problem, and the resin-coated metal tube is moved along the outer peripheral surface of the metal tube while it is moved without being stationary. An object of the present invention is to provide a technique for removing the coating with a constant width.

  In order to achieve the above object, the resin coating removal system according to claim 1 includes a transfer means for moving the resin-coated metal material in a constant direction at a constant speed, a laser oscillator, and a predetermined interval from each other. A plurality of laser heads arranged along the moving direction of the resin-coated metal material and a combination of a plurality of reflecting mirrors, and a plurality of light guide paths respectively corresponding to the laser heads on a one-to-one basis, and the laser Each time the galvano unit that distributes the laser beam emitted from the oscillator to the reflecting mirror located at the start end of each light guide and the processing location set on the resin-coated metal material reaches the irradiation area of each laser head, The deflection angle of the galvano unit is controlled so that the laser beam reaches the reflecting mirror located at the beginning of the light guide corresponding to the laser head, and the laser oscillation is performed. And a control device that emits a laser beam from each of the light guides, and each light guide is formed so that the laser beam reflected by the reflecting mirror located at the end of the light guide enters the entrance of each corresponding laser head. In this resin coating removal system, the light of each laser head is distributed so that the irradiation region of the laser beam emitted from the emission port of each laser head is dispersed along the outer peripheral surface of the resin-coated metal material. It is characterized in that the angle of the axis is set.

In the resin coating removal system according to the present invention, as the processing location set on the resin-coated metal material moves, a laser beam is irradiated one after another from the nearest laser head, and along the outer peripheral surface of the processing location. Since the mechanism for removing the resin coating is provided, the resin coating can be efficiently removed without stopping the movement of the resin-coated metal material.
In addition, a dedicated light guide path is prepared for each of the plurality of laser heads, and the laser beam is distributed to each light guide path via the galvano unit. It is possible to remove the resin coating around the outer peripheral surface of the resin-coated metal material with a laser oscillator.

FIG. 1 is a side view schematically showing the overall configuration of a resin coating removal system 10 according to the present invention. Eight laser heads 14 (first laser heads 14a) arranged around a resin-coated metal tube 12 are shown. 8th laser head 14h), 8 light guide paths 16 (first light guide path 16a to 8th light guide path 16h) comprising a combination of a plurality of reflecting mirrors, galvano unit 18, and CO ₂ laser oscillator 20 And a control PC (control device) 22.

The first light guide path 16a is constituted by a combination of a first reflecting mirror 24a, a second reflecting mirror 26a, and a third reflecting mirror 28a.
The eighth light guide path 16h is constituted by a combination of a first reflecting mirror 24h, a second reflecting mirror 26h, and a third reflecting mirror 28h.

  For convenience of illustration, the first light guide 16a and the eighth light guide 16h are drawn in a complete form including the first reflecting mirror 24, the second reflecting mirror 26, and the third reflecting mirror 28 as described above. In contrast, only the first reflecting mirror 24 (24b to 24g) is displayed for the other light guide path 16, and the description of the second reflecting mirror 26 and the third reflecting mirror 28 is omitted. ing.

Each light guide 16 has a one-to-one correspondence with a specific laser head 14 and plays a role of guiding the laser beam L emitted from the laser oscillator 20 and deflected by the galvano unit 18 to the corresponding laser head 14.
The number of reflecting mirrors constituting the light guide path 16 is not limited to three, and the number of reflecting mirrors necessary for guiding the laser beam L to each laser head 14 is installed.

  The galvano unit 18 includes an X-axis mirror 30 and a motor 32, a Y-axis mirror 34, and a motor 36. The first reflecting mirrors 24a to 24h serving as the start ends of the first reflecting mirrors 24a to 24h.

  Each laser head 14 includes a laser beam entrance 38 and an exit 40, and although not shown, a collimation lens, a focusing lens, and the like are disposed therein.

The control PC 22 is connected to the laser oscillator 20 and the galvano unit 18 via a cable.
The control PC 22 functions to control the emission of the laser beam by the laser oscillator 20 and the deflection angle of the laser beam by the galvano unit 18 in accordance with the installed program.

The resin-coated metal tube 12 is continuously extended at a constant speed (for example, 16 m / min) in a certain direction (right direction in the figure) while being linearly extended by a transfer mechanism such as an electric roller (not shown). Has been sent to.
As shown in FIG. 2, the resin-coated metal tube 12 has a structure in which a resin coating 44 made of a fluororesin or the like is formed on the outer periphery of a metal tube material 42.

As shown in FIG. 1, the laser heads 14 are arranged along the longitudinal direction (transfer direction) of the resin-coated metal tube 12 at a predetermined interval from each other, and are fixed via a jig (not shown). .
At this time, as shown in FIG. 2, the emission port 40 of each laser head 14 is directed to the surface side of the resin-coated metal tube 12.

That is, the emission port 40a of the first laser head 14a is directed so that the laser beam La is irradiated directly above the resin-coated metal tube 12.
In contrast, the exit port 40b of the second laser head 14b has a resin-coated metal tube in which the optical axis of the emitted laser beam Lb is relative to the optical axis of the laser beam La emitted from the first laser head 14a. The twelve center points O are inclined so as to intersect at an angle of 45 degrees.
In addition, the emission port 40c of the third laser head 14c has an optical axis of the laser beam Lc emitted from the resin-coated metal tube 12 with respect to the optical axis of the laser beam Lb emitted from the second laser head 14b. They are arranged so as to intersect at an angle of 45 degrees at the center point O.
Similarly, in the subsequent laser head 14, the optical axis of the emitted laser beam L is the center point O of the resin-coated metal tube 12 with respect to the optical axis of the laser beam L emitted from the previous laser head 14. Are arranged radially so as to intersect at an angle of 45 degrees.

Hereinafter, a resin coating removal method using the resin coating removal system 10 will be described.
First, the laser beam L output from the laser oscillator 20 is deflected in a necessary direction in the galvano unit 18 and is incident on the first reflecting mirror 24a belonging to the first light guide path 16a.
The laser beam La is reflected in a predetermined direction by the second reflecting mirror 26a and the third reflecting mirror 28a belonging to the first light guide path 16a, and reaches the incident port 38a of the first laser head 14a.
Then, the laser beam La formed into a rectangular shape by the lens in the first laser head 14a is irradiated on the surface of the resin-coated metal tube 12, and the resin coating 44 is partially evaporated.

Next, when the processing portion A from which the resin coating 44 has been partially removed reaches the irradiation position of the laser beam by the second laser head 14b as the resin-coated metal tube 12 is transferred, the laser oscillator 20 The laser beam L is emitted from.
As shown in FIG. 3, the laser beam L is deflected in a necessary direction in the galvano unit 18 and enters the first reflecting mirror 24b belonging to the second light guide path 16b.
The laser beam Lb is reflected in a predetermined direction by the second reflecting mirror 26b and the third reflecting mirror 28b belonging to the second light guide path 16b, and reaches the incident port 38b of the second laser head 14b.
Then, as shown in FIG. 4, the laser beam shaped into a rectangular shape by the lens in the second laser head 14b is irradiated on the surface of the resin-coated metal tube 12 obliquely from the upper left direction, and the resin coating 44 is partially applied. To evaporate.

  Thereafter, each time the processing location A reaches the irradiation area of the next laser head 14 with the transfer of the resin-coated metal tube 12, the above processing process is repeated.

FIG. 5 shows an example of processing when the processing location A reaches the irradiation region of the fifth laser head 14e, and the laser beam L emitted from the laser oscillator 20 is deflected in a necessary direction in the galvano unit 18. Then, the light enters the first reflecting mirror 24e belonging to the fifth light guide 16e.
The laser beam Le is reflected in a predetermined direction by the second reflecting mirror 26e and the third reflecting mirror 28e belonging to the fifth light guide path 16e, and reaches the incident port 38e of the fifth laser head 14e.
As a result, the laser beam Le formed into a rectangular shape by the lens in the fifth laser head 14e is irradiated from the directly below to the surface of the resin-coated metal tube 12, and the resin coating 44 is partially evaporated.

FIG. 6 shows an example of processing when the processing location A reaches the irradiation region of the eighth laser head 14h, and the laser beam L emitted from the laser oscillator 20 is deflected in a necessary direction in the galvano unit 18. Then, the light enters the first reflecting mirror 24h belonging to the eighth light guide path 16h.
The laser beam Lh is reflected in a predetermined direction by the second reflecting mirror 26h and the third reflecting mirror 28h belonging to the eighth light guide path 16h, and reaches the incident port 38h of the eighth laser head 14h.
As a result, the laser beam Lh shaped in a rectangular shape by the lens in the eighth laser head 14h is irradiated from the diagonally upper right direction on the surface of the resin-coated metal tube 12 to partially evaporate the resin coating 44.

  As a result of the above processing, the resin coating 44 at the processing location A is completely removed with a constant processing width (for example, 16 mm) along the outer peripheral surface of the resin-coated metal tube 12, and the surface of the metal tube 42 is exposed.

As shown in FIG. 7, there is a slight overlap region ab (for example, 3 mm width) between the irradiation region a of the first laser head 14a and the irradiation region b of the second laser head 14b. In addition, a similar overlapping region ha is generated between the irradiation region a of the first laser head 14a and the irradiation region h of the eighth laser head 14h.
However, the main portions of the respective irradiation regions are distributed and arranged along the outer peripheral surface of the resin-coated metal tube 12 without overlapping.

  In this way, both ends of the irradiation area of each laser head 14 partially overlap, and most of the irradiation areas are distributed in a non-overlapping manner, so that no resin coating 44 is left behind, and the resin-coated metal is not left behind. It is possible to cleanly remove the entire outer peripheral surface of the tube 12.

  The resin-coated metal tube 12 continues to move during this processing, and when the next processing location set at a predetermined interval (for example, an interval of 5 m) reaches the irradiation region of the first laser head 14a, the above-described processing is performed. The processing process is repeated, and the resin coating 44 is removed.

  The control PC 22 determines the timing of laser beam irradiation in accordance with the transfer speed of the resin-coated metal tube 12, the distance between the laser heads 14, and the distance between the processing points.

  As described above, the laser beam irradiation width, irradiation angle, laser, and so on are covered by the laser beam sequentially irradiated from each laser head 14 so as to cover the entire circumference of the processing location set on the resin-coated metal tube 12. Since the number of installed heads 14 is specified, the resin coating 44 can be removed over the entire circumference using one laser oscillator 20 without rotating the resin-coated metal tube 12 or the laser head 14 side. Can do.

Moreover, since it is not necessary to stop the transfer of the resin-coated metal tube 12 during processing, it is possible to continuously remove the resin coating on the long resin-coated metal tube 12 at regular intervals. Can be dramatically improved.
Incidentally, the exposed portion of the metal tube 42 formed on the resin-coated metal tube 12 is subjected to processing such as cutting and caulking in a subsequent process.

  In the above, an example of removing the resin coating 44 of the resin-coated metal tube 12 has been shown, but the present invention is not limited to this, and is applied to a resin coating removal process for a resin-coated metal cable or resin-coated metal wire. Of course it is also possible to do.

  Further, in the above, the example in which the resin coating 44 is removed over the entire circumference of the outer peripheral surface of the resin-coated metal tube 12 has been shown, but the number of installed laser heads 14 can be reduced or the irradiation width of the laser beam The resin coating 44 can be partially removed by narrowing.

In the resin coating removal system according to the present invention, it is a side view showing a state in which a laser beam is emitted from a first laser head. It is a fragmentary sectional view which shows a mode that the laser beam is radiate | emitted from the 1st laser head among the laser heads arrange | positioned radially around the resin-coated metal tube. It is a side view which shows a mode that the laser beam is radiate | emitted from the 2nd laser head in the resin coating removal system which concerns on this invention. It is a fragmentary sectional view which shows a mode that the laser beam is radiate | emitted from the 2nd laser head among the laser heads arrange | positioned radially around the resin-coated metal tube. In the resin coating removal system according to the present invention, it is a side view showing a state in which a laser beam is emitted from a fifth laser head. In the resin coating removal system according to the present invention, it is a side view showing a state in which a laser beam is emitted from an eighth laser head. It is a conceptual diagram which shows the distribution condition of the irradiation area | region by each laser head.

10 Resin coating removal system
12 Resin coated metal tube
14 Laser head
14a First laser head
14b Second laser head
14c Third laser head
14e Fifth laser head
14h Eighth laser head
16 Light guide
16a First light guide
16b Second light guide
16e 5th light guide
16h 8th light guide
18 Galvano unit
20 Laser oscillator
22 Control PC
24 First reflector
24a First reflector included in the first light guide
24b The first reflecting mirror included in the second light guide
24e The first reflecting mirror included in the fifth light guide
24h The first reflecting mirror included in the eighth light guide
26 Second reflector
26a Second reflecting mirror included in the first light guide
26b Second reflector included in second light guide
26e The second reflecting mirror included in the fifth light guide
26h Second reflector included in the eighth light guide
28 Third reflector
28a Third reflector included in the first light guide
28b Third reflector included in the second light guide
28e A third reflecting mirror included in the fifth light guide
28h Third reflector included in the eighth light guide
30 X-axis mirror
32 X-axis motor
34 Y-axis mirror
36 Y-axis mirror motor
38 Laser head entrance
38a Entrance of first laser head
38b Entrance of the second laser head
38e Entrance of 5th laser head
38h 8th laser head entrance
40 Laser head exit
40a Output port of the first laser head
40b The exit of the second laser head
40c Third laser head exit
42 Metal pipe
44 Resin coating
L Laser beam
La Laser beam on the first light guide
Lb Laser beam on the second light guide
Lc Laser beam on the third light guide
Le Laser beam on the fifth light guide
Lh Laser beam on the eighth light guide

Claims (1)

A transfer means for moving the resin-coated metal material in a fixed direction at a fixed speed;
A laser oscillator;
A plurality of laser heads arranged along the moving direction of the resin-coated metal material at a predetermined interval from each other;
A plurality of light guides each consisting of a combination of a plurality of reflecting mirrors and corresponding to each of the laser heads on a one-to-one basis,
A galvano unit that distributes the laser beam emitted from the laser oscillator to a reflecting mirror located at the beginning of each light guide;
Each time the processing spot set on the resin-coated metal material reaches the irradiation area of each laser head, the laser beam reaches the reflecting mirror located at the start end of the light guide corresponding to the laser head, so that A control device for controlling the deflection angle of the galvano unit and emitting a laser beam from the laser oscillator,
A resin coating removal system in which each light guide is formed such that a laser beam reflected by a reflecting mirror located at the end of the light guide is incident on an incident port of each corresponding laser head,
The angle of the optical axis of each laser head is set so that the irradiation area of the laser beam emitted from the emission port of each laser head is dispersed along the outer peripheral surface of the resin-coated metal material. Characteristic resin coating removal system.

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