JP2010184490A - Resin melt welding method by laser beam and resin melt welding apparatus by laser beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel resin melt welding method and a resin melt welding apparatus by laser beam by means of which a melt welding surface area is widened by high scanning operation of the laser beam to attain high quality surface melt welding with high speed melt welding. <P>SOLUTION: When the laser beam L to be scanned on the melt welding surface is passed on a second locus S2 approaching and overlapping on a first locus before a molten portion is cured from a molten state on the first locus S1, while the resin materials 1, 2 on the first locus are heated again by the laser beam L to keep the molten state to form the wide melt welding surface S0, the whole melt welding surface is sequentially scanned to form the melt welding state by the laser beam at high speed to be surface-welded in an optional shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to, for example, a scan welding technique in which resin materials are welded at a high speed, and in particular, by a novel laser beam that allows high-speed surface welding of an arbitrary shape by high-speed scanning operation of a laser beam. The present invention relates to a resin welding method and a resin welding apparatus using a laser beam.

  In recent years, a resin welding apparatus (laser welding apparatus) using a laser beam from a laser diode as an energy source has been developed as a welding technique for welding resin materials. For the welding method, a large number of laser diodes are arranged on the welding surface to be welded, and the batch irradiation method is used to perform surface welding at once, and the laser beam from one laser diode is irradiated to one point on the welding surface. However, a single-axis scanning method that allows scanning while being used has been put into practical use.

  The above-mentioned batch irradiation method is a classic method in which a large number of laser diodes are aligned and welded together according to the welding surface to be welded. Recently, a collective irradiation method for splitting a single laser beam into a plurality of laser beams has been developed. The configuration is such that laser light generated from a YAG laser oscillator or the like enters a diffractive optical component such as a diffractive lens and is split into a plurality of beams while being diffracted and transmitted. Each beam converges on the focal point on the surface of the opaque absorbent resin by a condenser lens or the like and generates heat simultaneously. The heat is also transmitted to the permeable resin, and the joints near the plurality of focal points are melted, and the resin is welded. A large number of focal points can be formed, and since they generate heat at the same time, the work material is not deformed as in the technique of scanning the focal point. This method can also be used for operations such as removing the resin from a portion of the circuit board. The material to be processed may be a metal or the like in addition to a resin (for example, see Patent Document 1).

  Another collective irradiation method includes a diffractive optical component (diffractive lens) having an uneven step shape to split a single laser beam into a plurality of laser beams, and the uneven step shape is set to a predetermined shape. Thus, the single laser beam is, for example, a ring-shaped laser beam. Therefore, even when the welded portion of the workpiece is ring-shaped, the ring-shaped laser light is applied to the welded portion of the workpiece through the condensing lens to be welded together. More specifically, a laser oscillator that outputs laser light and an optical means for making the laser light into a ring shape are provided, and a workpiece is processed with the ring-shaped laser light. At this time, the optical means expands the laser beam output from the laser oscillator and adjusts it to a parallel laser beam with a predetermined diameter, and a pair of parallel laser beams with a predetermined diameter as ring-shaped parallel light. Laser processing for controlling the inner diameter and / or outer diameter of the ring-shaped laser beam on the surface of the workpiece by controlling the distance between the expander and the collimator and / or the distance between the optical elements. Device (see, for example, Patent Document 2).

  On the other hand, in order to obtain a resin welding apparatus using a laser beam that is simple in configuration and easy to control, the scanning method has a high-quality laser beam generator that outputs a parallel laser beam, and the output laser beam is directed to a workpiece. In some cases, a resin welding apparatus is constituted by an XY two-axis rotating mirror unit that irradiates and a workpiece support jig provided with the rotating shaft (for example, see Patent Document 3).

  In addition, another scanning method uses a resin member having a gap between the resin members so that excessive distortion does not occur, the degree of freedom in product design is relatively high, and the airtightness between the resin members is kept uniform. Some have made it possible to weld. The structure includes a transparent resin member for resin welding laser light and a non-transparent resin member that absorbs and heats the laser light, and a part of the surface of the transparent resin member is formed as a recess, A part of the surface of the transparent resin member is formed as a convex part, where the volume of the concave part is V, and the convex part has a fitting volume v to the concave part, and 0.1 V when fitted to the concave part. ≦ v <V is a shape that creates a space, and the concave portion and the convex portion are fitted, and the convex portion is melted by irradiating the convex portion with laser light from the concave portion side. There is one that satisfies the fitting volume v + Δv ≦ 1.2V and laser welds the concave portion and the convex portion (for example, see Patent Document 4).

  JP 2003-164985 A   Japanese Patent Laying-Open No. 2005-028428   JP 2005-254618 A   JP-A-2005-007759

  In the batch irradiation method in which the single laser beam is branched into a plurality of laser beams, the laser beam is split into a plurality of beams, and each beam is focused on the surface of an opaque absorbent resin by a condenser lens or the like. The joints near a plurality of focal points are melted, the joints between the resins are fused, and the work material is not deformed as in the technique of scanning the focal points. However, the shape of the welded surface of the joint (focal point) dispersed into a plurality of beams is limited to a symmetric shape such as a straight line, a ring circle, a uniform dispersion point, and so on. For this reason, it is not possible to weld a welded surface shape that exhibits an asymmetrical shape or an arbitrary shape at the same time, but the energy density is diffused and low due to beam spectroscopy. There are many problems such as the necessity of a high-power laser oscillator. Furthermore, YAG or fiber laser is used as the branching technique, but the profile is not suitable for welding because of the Gaussian profile. For example, there is a problem that even if defocused, it becomes Gaussian and becomes a pointed irradiation line and burns, or lack of welding.

  In the first scanning method (Japanese Patent Laid-Open No. 2005-254618), a high-quality laser beam generator that outputs a parallel laser beam is used, so that the output laser beam is emitted toward the workpiece. Since a simple XY biaxial rotating mirror unit can be used as the polarizing means (optical scanning means) for this purpose, it is possible to weld a curved surface shape while the apparatus structure is simple. However, the biggest problem with the scanning method is that scanning is performed while irradiating the laser beam from one laser diode toward one point on the welding surface, so when performing surface welding with a large surface area, the entire surface is simultaneously welded. Difficult to do. For this reason, when the laser beam moves on the movement trajectory for the first time, the irradiated and melted resin rapidly solidifies, so that it solidifies again when scanning the second laser beam that passes near the first trajectory. It does not melt from the state. However, if the resin part solidified after melting is melted again, the resin material will deteriorate. Therefore, there is a problem in that sink marks and warpage occur in the welded portion of the resin molded product, and high-precision surface welding cannot be guaranteed. The first scanning method does not describe technical means for solving this.

  Furthermore, as a problem in the above scanning method, as shown in FIG. 13, the laser beam has a folding locus Lp at a turning point P from the first locus La to the second locus Lb that reciprocally scans the welding surface width A. Since it becomes an acute triangular locus, the entire surface of the resin plate P0 that remains solid is not melted evenly and remains unmelted. As a result, the welding surface width A is not entirely welded, and there is a problem that airtight defects or sink marks or warpage due to poor welding occur in the welded part of the resin molded product, and high-precision surface welding with high airtightness cannot be guaranteed. There is a point.

  Furthermore, in the second scanning method (Japanese Patent Laid-Open No. 2005-007759), laser welding between resin members having a gap can be performed uniformly, and a welded molded article with good confidentiality can be obtained. However, since the two upper and lower resin plates are a specific technique limited to fitting the concave portion and the convex portion, there is a problem that they are not versatile.

  The present invention has been made in view of various problems in the conventional batch irradiation method and scanning method. The object is to provide an innovative and novel scan welding technique that overturns the basic principles of surface welding and mask surface welding in the conventional scanner welding. Specifically, the molten part on the first locus is solidified again by a laser beam that passes on the second locus before the molten portion on the first locus is solidified before solidifying. The present invention provides a scan welding method and a welding apparatus for generating a wide melt area and performing high-speed welding of a wide surface weld of an arbitrary shape with high quality by scanning with a laser beam.

  In order to achieve the above object, the resin welding method using a laser beam according to claim 1 of the present invention is characterized in that the laser beam scanned on the welding surface is melted on the first locus before the melted portion solidifies. When passing over the second trajectory that has been polymerized close to the trajectory, the resin on the first trajectory is reheated again with the laser beam to maintain the molten state, and then on the third trajectory that is polymerized close to the second trajectory. When passing through the laser beam, the resin on the second trajectory is reheated again with the laser beam, and a progressively large polymerization area is generated under repeated polymerization conditions to maintain the molten state. It is characterized in that the surfaces are welded together in an arbitrary shape as a molten state.

  The resin welding method using a laser beam according to claim 2 of the present invention is the resin welding method using a laser beam according to claim 1, wherein the laser beam polymerization condition is determined from a first trajectory scanning between the welding surface widths. The return trajectory at the return point to the second trajectory is a rectangular trajectory that finely moves to the next movement trajectory.

  The resin welding method using a laser beam according to claim 3 of the present invention is the resin welding method using a laser beam according to claim 1 or 2, wherein the moving speed of the laser beam is 100 mm / sec to 1500 mm / sec. It is characterized by that.

  The resin welding method using a laser beam according to claim 4 of the present invention is the resin welding method using a laser beam according to claim 1 or 2, wherein the beam width of the laser beam is 0.5 mm to 1.5 mm. The second trajectory is passed through the first trajectory from the tangential line of the width to about half the width.

  According to a fifth aspect of the present invention, there is provided a laser beam welding apparatus according to a fifth aspect of the present invention, a laser oscillator for outputting a laser beam, a collimated beam on a workpiece after the parallel beam is used as the laser beam from the laser oscillator. An optical lens system for irradiating, a galvano mechanism for deflecting the parallel light beam to irradiate a focused beam to an arbitrary position on the workpiece, and an irradiation for controlling the movement locus and moving speed of the focused beam by the galvano mechanism And a control means.

  According to a sixth aspect of the present invention, there is provided a laser beam resin welding apparatus according to the fifth aspect, wherein the laser beam resin welding apparatus includes a mask base on a surface of a workpiece to be irradiated with the focused beam. It is characterized by that.

  A laser beam resin welding apparatus according to claim 7 of the present invention is the laser beam resin welding apparatus according to claim 5, wherein the workpiece is strip-shaped, and the workpiece is longitudinally arranged. Equipped with a feeding means.

  A laser beam resin welding apparatus according to claim 8 of the present invention is the laser beam resin welding apparatus according to any one of claims 5, 6, or 7, wherein the optical lens system includes a laser light source. A parallel light lens system such as an achromatic lens that uses laser light as a parallel light beam, a reflecting mirror, and a condensing lens system such as a meniscus lens or an efciator lens that uses the parallel light as a condensed beam. Features.

  According to a ninth aspect of the present invention, there is provided a laser welding resin welding apparatus according to any one of the fifth, sixth and seventh aspects, wherein the galvano-mechanism reflector is an XY servomotor. It is characterized in that the angle is controlled by.

  The effects of the resin welding method using a laser beam according to claims 1 to 4 of the present invention are that the welding surface is scanned at a high speed at a moving speed of 100 mm / sec to 1500 mm / sec and the beam width is set to 0.5 mm to 1.5 mm. Since the second trajectory is passed through the first trajectory up to about half the width of the light beam, the laser beam passed on the first trajectory is superposed on the first trajectory before solidifying from the molten state. When passing on the second locus, the resin on the first locus is reheated again by the laser beam to maintain the molten state. Thus, the entire surface of the weld can be sequentially melted at a high speed surface in an arbitrary shape while generating a wide melt area. Furthermore, with regard to the laser beam polymerization conditions, since the folding locus at the folding point for reciprocating scanning between the welding surface widths is a rectangular locus that finely moves to the next movement locus, the entire surface of the welding surface is evenly and completely bonded. .

  According to the resin welding apparatus using a laser beam according to claims 5 to 7 of the present invention, the resin welding method using the laser beam can be efficiently performed at a high speed. Also, mask welding can be efficiently performed at a high speed. Furthermore, in the case where the workpiece is in the form of a strip, the workpiece is continuously welded to the workpiece by feeding control of the workpiece in the longitudinal direction by the feeding means.

  The action of the optical lens system according to claim 8 of the present invention and the galvano mechanism according to claim 9 is such that the parallel beam is deflected after the laser beam from the laser oscillator is converted into a parallel beam, and becomes a workpiece. Since the two stacked resin plates are irradiated as a focused beam, the focused beam having a predetermined specification can be accurately irradiated to an arbitrary position of the workpiece.

  According to the resin welding method using a laser beam according to claims 1 to 4 of the present invention, the welding surface is scanned at a high speed at a moving speed of 100 mm / sec to 1500 mm / sec, and the beam width is set to 0.5 mm to 1.5 mm. Since the second trajectory is passed through the first trajectory up to about half the width of the light beam, a wide melting area can be generated, and the entire surface of the weld can be sequentially melted into a desired shape at a high speed surface. There is no material deterioration of the material, no sink marks or warpage occurs in the welded part of the resin molded product, and high quality and high precision surface welding can be guaranteed. Further, with respect to the laser beam superposition conditions, even if the surface of the folding point where the reciprocating scanning is performed between the welding surface widths is a rectangular locus that finely moves to the next movement locus, even a wide surface welding of an arbitrary shape can be completely and evenly bonded.

  According to the resin welding apparatus using a laser beam according to claims 5 to 9 of the present invention, the resin welding method using a laser beam can be carried out efficiently and at a high speed. According to the optical lens system and the galvano mechanism, the laser beam from the laser oscillator is converted into a parallel beam and then the parallel beam is deflected, and a focused beam having a predetermined specification is placed at an arbitrary position on a two-layered resin plate material to be processed. Can be irradiated accurately. Also, mask welding can be performed efficiently at high speed. Furthermore, in the case where the workpiece is in the form of a strip, the workpiece can be controlled to be fed in the longitudinal direction by the feeding means, and the workpiece welding of the long object can be continuously surface-welded.

  It is a block diagram which shows the 1st Embodiment of this invention and shows the procedure of the resin welding method by a laser beam.   FIG. 2 is a trajectory diagram of scan movement by a laser beam according to the first embodiment of this invention.   FIG. 2 is a trajectory diagram of the first and second trajectories of a laser beam and a lower passing polymerization according to the first embodiment of the present invention.   BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the resin welding apparatus by the laser beam which shows the 1st Embodiment of this invention.   1 is a schematic diagram of a laser welding head according to a first embodiment of the present invention.   FIG. 2 is a photograph of a welded surface joint portion, showing the first embodiment of the present invention.   FIG. 2 is a photograph of a welded surface joint portion, showing the first embodiment of the present invention.   FIG. 2 is a photograph of a welded surface joint portion, showing the first embodiment of the present invention.   FIG. 2 is a photograph of a welded surface joint portion, showing the first embodiment of the present invention.   FIG. 2 is a photograph of a welded surface joint portion, showing the first embodiment of the present invention.   FIG. 2 is a photograph of a welded surface joint portion, showing the first embodiment of the present invention.   FIG. 2 is a photograph of a welded surface joint portion, showing the first embodiment of the present invention.   It is an effect | action figure of the scanning locus | trajectory in the narrow welding surface width | variety which shows a prior art example.

  Hereinafter, embodiments of the present invention will be described sequentially with reference to FIGS. 1 to 12.

The resin welding method using a laser beam according to the first embodiment of the present invention includes the following main steps. First, as shown in FIGS. 1 to 3, the “resin welding method using a laser beam” is a first locus of a laser beam L that scans the welding surface 1 </ b> A of the two-layered resin plate materials 1 and 2 to be processed. Irradiate upwards "(A). Subsequently, “pass the second trajectory S2 in which the laser beam L is polymerized close to the first trajectory before solidifying from the molten state on the first trajectory S1” (B). Then, “the resin plate material on the first trajectory is reheated again to maintain the molten state and generate a wide melting area SO” (C). Furthermore, “sequentially weld the entire welded surface in a melted state by high-speed scanning with a laser beam into an arbitrary shape” (D).
That is, the resin welding method using a laser beam is performed on the second locus obtained by polymerizing the laser beam scanned on the welding surface close to the first locus before solidification of the melted portion solidified on the first locus. At the time of passing, the resin on the first locus is reheated again by the laser beam to maintain the molten state, and when passing on the third locus that has been polymerized close to the second locus, the second laser beam is again applied by the laser beam. A process that repeatedly heats the resin on the trajectory to maintain the molten state and repeats the close polymerization to create a broad melting area, and the entire surface of the weld is melted by high-speed scanning of the laser beam to form an arbitrary shape in a lump. It is.

  Subsequently, various forms of polymerization conditions for repeating the close polymerization of the laser beam L will be described. First, FIG. 2A shows a circular trajectory of a high-speed scan of the laser beam L for ring-shaped surface welding. FIG. 2B shows a rectangular trajectory of the high-speed scan of the laser beam L for the checkered surface welding. FIG. 2C shows a rectangular trajectory of high-speed scanning of the laser beam L with respect to free-form surface ring-shaped surface welding. More specifically, FIG. 3A shows a superposition trajectory (overlap width L3) by high-speed scanning of a laser beam (ray width L2) L for ring-shaped surface welding. FIG. 3B shows a superposition trajectory (overlap width L3) by high-speed scanning of a laser beam (light ray width L2) L for checkered surface welding. FIG. 3C shows a superposition trajectory (tangential superposition) by high-speed scanning of a laser beam (ray width L2) L with respect to free-form surface ring-shaped surface welding. In particular, in FIG. 3C, the laser beam superposition conditions are the turn-back points P and P from the first trajectory (movement trajectory) S1 to the second trajectory (movement trajectory) S2 for reciprocating scanning between the welding surface widths. The return trajectory SP is a rectangular trajectory that finely moves to the next second trajectory (movement trajectory) S2.

  In the resin welding method using the laser beam L, as a result of various tests, the laser beam L has a laser scanning speed of 30 W to 50 W and a high scanning speed of 100 mm / sec to 1500 mm / sec. Established that there is. The light beam width L2 of the laser beam L is set to 0.5 mm to 1.5 mm, and the second locus (movement locus) S2 from the tangent to the light beam width to about half the width with respect to the first locus (movement locus) S1. It has been established from a number of test results that it is desirable to polymerize by polymerization (polymerization width L3).

  The external structure of the resin welding apparatus 100 using the laser beam will be described with reference to FIG. The configuration is provided in the three-axis orthogonal robot 10. First, on the upper surface of the base 40, a moving unit DX mounted thereon and driven by a feed motor MX, a moving table 42 mounted thereon, a jig unit 43 mounted on the moving table 42, and the jig unit 43 It consists of the member which press-grips the planar workpiece | work which piled up the two resin plates 1 and 2 with the clampers 44 and 45 with which the upper surface was equipped. A column 46 stands upright on one side of the base 40. A horizontal beam 47 is arranged in a horizontal posture from the top of the column 46 above the moving table 42. The horizontal beam 47 is directed in a direction perpendicular to the moving direction of the moving table 42, and a movement unit DY driven by a feed motor MY and a moving body 48 mounted on the moving unit DY are controlled on the upper surface. Equipped as The moving body 48 includes a moving unit DZ that is driven by a feed motor MZ that moves in the vertical direction. The moving body 49 of the moving unit DZ is equipped with a laser welding head LH and a CCD camera 5 oriented in a vertical vertical position. The laser welding head LH is connected to a laser oscillator 50 for processing and a laser power source LK for teaching with a fiber. Further, the three-axis orthogonal robot 10 and the CCD camera 5 are connected to a robot control panel 200 including a teaching box TB and a display 7, and teaching and playback operations are performed. The robot control panel 200 is provided with irradiation control means 80, each of which is organically connected and functions.

  In the resin welding apparatus 100 shown in FIGS. 4 and 5, the following functions can be added. First, a mask base (not shown) can be provided on the surface of the workpiece to be the resin plates 1 and 2. Further, instead of the three-axis orthogonal robot 10, a resin welding apparatus 100 using a laser beam using an articulated robot (not shown) may be used. Further, in the above-described resin welding apparatus 100, in the case where the workpieces 1 and 2 are in the form of strips, if the workpiece is controlled to be fed in the longitudinal direction by the feeding means, a long workpiece Welding is performed continuously.

  In the resin welding apparatus 100, the three-axis orthogonal robot 10 includes the laser welding head LH, and teaching and playback operations and the like by the robot control panel 200 including the irradiation control means 80 can be smoothly performed by three-axis orthogonal three-axis control. . Thereby, especially the resin welding operation | work of a small workpiece is performed simply. Also, the operation is from single processing, and in the case of mass production, the unprocessed parts 1 and 2 are carried into the clampers 44 and 45 equipped on the upper surface of the jig unit 43 and the finished small workpieces 1 and 2 after processing are carried out. If the means to perform is provided, it can be set as the welding system suitable for continuous mass production. Furthermore, it is possible to move a large stroke by the case of machining with only a galvano stroke and a robot. That is, when welding of one square pattern of resin welding is completed by the galvano mechanism 30, the robot 10 automatically moves the laser welding head LH to a new unprocessed workpiece, and after positioning, the galvano mechanism 30 follows the next machining pattern. An operation method for executing resin welding is executed.

  Further, the internal configuration of the laser welding head LH will be described with reference to FIG. The resin welding apparatus 100 irradiates the workpieces 1 and 2 as a condensed beam LO after making the laser beam 50 from which the laser beam L is output and the laser beam L from the laser oscillator into the parallel beam L1. An optical lens system 60, a galvano mechanism 30 that reflects the parallel light beam L1 to irradiate the condensed beam LO to an arbitrary position of the workpieces 1 and 2, and a movement locus S1 and movement of the condensed beam LO by the galvano mechanism Irradiation control means 80 for controlling the speed SS. The optical lens system 60 includes a parallel light lens system in which the laser beam L from the laser oscillator 50 is a parallel beam (beam diameter: around φ16.8 mm) L1, specifically, an achromatic lens 21 that reduces spherical aberration. It includes various parallel light lenses such as a reflecting mirror 22 and other condensing lens systems such as a meniscus lens 23 or an efciator lens that uses the parallel light L1 as a condensing beam LO. The angle of the reflecting mirror 22 of the galvano mechanism 70 is controlled by XY servo motors SM1 and SM2.

  Then, the effect | action of the resin welding apparatus 100 by the said laser beam is demonstrated. The laser beam L is output from the laser oscillator 50. The laser beam L from the laser oscillator is processed into a parallel beam (beam diameter: φ16.8 mm) L1 by the achromatic lens 21 of the optical lens 60 system and others. Further, the parallel rays are processed by the meniscus lens 23 and the like so as to irradiate the workpieces 1 and 2 as a condensed beam LO. Then, the galvano mechanism 30 deflects the parallel light beam L <b> 1 by the reflecting mirror 22. The angle of the reflecting mirror 22 of the galvano mechanism 30 is controlled by XY servo motors SM1 and SM2. Further, the irradiation control means 80 for controlling the galvano mechanism 30 controls the movement locus S1 and the movement speed SS of the focused beam LO at an arbitrary position of the workpieces 1 and 2.

  Further, the action of the galvano mechanism 30 is to convert the laser beam L from the laser oscillator 50 into the parallel beam L1 and then deflect the parallel beam and condense it on, for example, the two-layered resin plates 1 and 2 to be processed. Since it is irradiated as a beam LO, a focused beam of a predetermined specification can be accurately irradiated to an arbitrary position of the workpieces 1 and 2.

Subsequently, photographs of various galvano welding test results in the resin welding apparatus 100 using the laser beam will be introduced.
The photograph in FIG. 6 shows a welding confirmation test. The contents are PC material, t = 3 × 3 mm, laser beam: 30 W, 200 mm / sec, processing time: 0.87 sec.

  The photograph in FIG. 7 shows microwelding confirmation. The contents are PC material, t = 3 × 3 mm, laser beam: 30 W, 300 mm / sec, processing time: 1.8 sec.

  The photograph in FIG. 8 shows the creation of a mask base. The contents are (1) groove width 1.3 mm (2) laser beam: 30 W, (3) feed 800 mm / sec, (4) processing time: 0.5 sec. (5) Evaluation A gap of about 0.1 mm is generated.

  The photograph in FIG. 9 shows the creation of a mask base. The contents are (1) groove width 1.1 mm (2) laser beam: 30 W, (3) feed 300 mm / sec, (4) evaluation good (5) processing time: 1.5 sec.

  The photograph in FIG. 10 shows a test with a mask pattern. The mask pattern is 40 mesh (wire diameter 0.25 mm), PC material, t = 3 × 3 mm, laser beam: 30 W, feed 300 mm / sec, evaluation Mesh pattern does not appear.

  The photograph of FIG. 11 shows a 20 mesh test that becomes a mask pattern. Its contents are 20 mesh (wire diameter 0.25 mm), PC material, t = 3 × 3 mm, laser beam: 50 W, feed 800 mm / sec, and the corner of the evaluation net is ambiguous. Insufficient tracking of light.

  The photograph of FIG. 12 shows a 60 mesh test to be a mask pattern. The content is 60 mesh (wire diameter 0.25 mm), PC material, t = 0.5 × 3 mm, laser beam: 30 W, feed 300 mm / sec, and evaluation reaches the corner of the net. Refraction spots at t = 3 mm. There is no difference between the center and corner. No effect of irradiation angle. No shadow of irradiation. A good 80 micron square mask pattern was obtained. The black square pattern shown in the figure is a mask pattern. In addition, although the high-speed scanning speed has shown the data performed at 200 mm / sec-800 mm / sec, when the test of the appropriate range of high-speed scanning speed was done separately, the appropriate range of high-speed scanning speed was 100 mm / sec. It was confirmed to be ˜1500 mm / sec.

  The resin welding method using the laser beam according to the above embodiment has the following effects. First, high-speed scanning is performed on the welding surface at a moving speed of 100 mm / sec to 1500 mm / sec, the light beam width is set to 0.5 mm to 1.5 mm, and the second half of the light beam width is set to the second trajectory. Since the polymerization is performed through the trajectory, a wide melting area can be generated, and the entire welding surface can be sequentially melted at a high speed surface in an arbitrary shape, so that there is no deterioration of the material of the resin material. No warpage occurs and high quality and high precision surface welding can be guaranteed. Further, with respect to the laser beam superposition conditions, even if the surface of the folding point where the reciprocating scanning is performed between the welding surface widths is a rectangular locus that finely moves to the next movement locus, even a wide surface welding of an arbitrary shape can be completely and evenly bonded.

  Moreover, according to the resin welding apparatus 100 using the laser beam according to the above embodiment, the following effects can be obtained. First, a resin welding method using a laser beam can be efficiently performed at a high speed. According to the optical lens system and the galvano mechanism, the laser beam from the laser oscillator is converted into a parallel beam and then the parallel beam is deflected, and a focused beam having a predetermined specification is placed at an arbitrary position on a two-layered resin plate material to be processed. Can be irradiated accurately. Also, mask welding can be performed efficiently at high speed. Furthermore, in the case where the workpiece is in the form of a strip, the workpiece can be controlled to be fed in the longitudinal direction by the feeding means, and the workpiece welding of the long object can be continuously surface-welded.

  The resin welding method using a laser beam and the apparatus 100 according to the present invention are not limited to the configurations in the above embodiments, and detailed design changes of each part can be freely made within the gist of the invention.

  In the present invention, the object is described in the example of the resin material, but it can be applied as welding of various processed members.

DESCRIPTION OF SYMBOLS 1, 2 Resin board | plate material, to-be-processed material 1A Welding surface 10 Triaxial orthogonal robot 21 Achromatic lens etc. 22 Reflective mirror 23 Meniscus lens etc. 30 Galvano mechanism 43 Jig unit 44, 45 Clamper 50 Laser oscillator 60 Optical lens system 80 Irradiation control means 100 resin welding apparatus 200 robot control panel DX moving unit DY moving unit DZ moving unit L laser beam L1 parallel beam L2 beam width L3 overlap width LO focused beam LH laser welding head MX, MY, MZ feed motor P folding point S1 first Trajectory (movement trajectory)
S2 Second trajectory (movement trajectory)
SM1, SM2 XY servo motor SO welding area SP Folding locus (rectangular locus)
SS movement speed

Claims (9)

  When the laser beam scanned on the welding surface passes through the second trajectory that has been polymerized close to the first trajectory before solidification of the melted portion that has melted on the first trajectory, the first laser beam is again applied. The resin on the trajectory is reheated to maintain the molten state, and when passing through the third trajectory that has been polymerized close to the second trajectory, the resin on the second trajectory is reheated and melted again with the laser beam. A resin welding method using a laser beam, characterized in that the entire surface of the welding is made into a molten state by a high-speed scanning of a laser beam to form a molten surface in an arbitrary shape while generating a gradually wide melting area under a polymerization condition that repeats proximity polymerization to maintain the state .   The laser beam superimposing condition is characterized in that the return trajectory at the return point from the first trajectory to the second trajectory for reciprocating scanning between the welding surface widths is a rectangular trajectory that finely moves to the next movement trajectory. Item 2. A resin welding method using a laser beam according to Item 1.   3. The resin welding method using a laser beam according to claim 1, wherein a moving speed of the laser beam is set to 100 mm / sec to 1500 mm / sec.   3. The resin by a laser beam according to claim 1, wherein the laser beam has a light beam width of 0.5 mm to 1.5 mm, and polymerization conditions are set so as to allow close polymerization from a tangent to the light beam width to about half the width. Welding method.   A laser oscillator that outputs a laser beam; an optical lens system that irradiates the workpiece with a parallel beam after the laser beam from the laser oscillator is converted into a parallel beam; A resin welding using a laser beam, comprising: a galvano mechanism for irradiating a focused beam to an arbitrary position of the material; and an irradiation control means for controlling a moving locus and a moving speed of the focused beam by the galvano mechanism. apparatus.   6. The resin welding apparatus using a laser beam according to claim 5, wherein a mask base is disposed on the surface of a workpiece to be irradiated with the focused beam.   6. The resin welding apparatus using a laser beam according to claim 5, wherein the workpiece is provided with a feeding means in a longitudinal direction in the workpiece.   The optical lens system is a collection of a parallel light lens system such as an achromatic lens that uses a laser beam from a laser light source as a parallel beam, a reflecting mirror, and a meniscus lens or an efciator lens that uses the parallel light as a condensed beam. A resin welding apparatus using a laser beam according to any one of claims 5, 6 and 7, further comprising an optical lens system.   8. The resin welding apparatus using a laser beam according to claim 5, wherein the galvano mechanism controls the angle of the reflecting mirror with an XY servo motor.

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