Metal surface processing method

Abstract

To provide a metal surface processing method in which a surface of a metal member is irradiated with pulse wave laser to smoothly apply surface roughening in rectangular patterns on the surface of the metal member.SOLUTION: In a metal surface processing method, a surface of a metal member A is irradiated with pulse wave laser L and scanned at predetermined scanning intervals in order to apply surface roughening in rectangular patterns 1, 2 with corner parts 1A, 2A. In the metal surface processing method, irradiation start portions 11, 21 and irradiation finish portions 12, 22 in the rectangular patterns 1, 2 are set to portions other than the corner parts 1A, 2A in radiating the pulse wave laser L.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a metal surface treatment method for roughening a metal surface by irradiating it with a pulsed laser. [Background technology]

[0002] Patent Document 1 describes a method for processing a joining surface formed on the surface of a material by irradiating the joining surface with a high-energy beam in a manner that draws a closed locus, describes in paragraph 0054 that a metal material is used as the material for forming the joining surface, describes in paragraph 0052 that the high-energy beam is irradiated by pulsed laser light, and describes in paragraph 0014 that the irradiation locus of the high-energy beam on the joining surface may be a closed locus, a circular irradiation locus, or a rectangular irradiation locus.

[0003] However, although this cited document 1 states that the irradiation locus of the high-energy beam on the joining surface may be a rectangular irradiation locus as long as it is a closed locus, it does not describe the irradiation start and end positions in this rectangular pattern in surface treatment in which a pulsed laser is irradiated to form a rectangular pattern. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6024122 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to smoothly roughen the surface of a metal member in a rectangular pattern by irradiating the surface with a pulsed laser. [Means for solving the problem]

[0006] The metal surface treatment method according to claim 1 of the present invention is a metal surface treatment method for roughening a surface of a metal member by irradiating the surface of the metal member with a pulsed laser and scanning it at a predetermined scanning interval to form a rectangular pattern having corners, characterized in that the pulsed laser is irradiated by setting the irradiation start position and irradiation end position of the rectangular pattern to positions other than the corners.Furthermore, the metal surface treatment method according to claim 2 is the metal surface treatment method according to claim 1, characterized in that the pulsed laser is irradiated by setting the irradiation start position and irradiation end position of each irradiation locus to be different from each other. [Effects of the Invention]

[0007] In the metal surface treatment method of the present invention, in which a pulsed laser is irradiated onto the surface of a metal member and scanned at a predetermined scanning interval to perform a roughening treatment that results in a rectangular pattern having corners, by setting the irradiation start point and irradiation end point in the rectangular pattern to points other than the corners and irradiating the pulsed laser, it is possible to smoothly perform a roughening treatment that results in a rectangular pattern on the surface of the metal member by irradiating the pulsed laser. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view showing a state in which a pulsed laser is irradiated onto the surface of a metal member of the present invention. FIG. [Figure 2] FIG. 2 is a partial cross-sectional view showing a state in which pulsed laser irradiation is starting on the surface of the metal member of the present invention. [Figure 3] 10 is a side view showing an operation of joining a resin member to a metal member according to the present invention. FIG. [Figure 4] 1 is a cross-sectional view of a metal-resin composite of the present invention. [Figure 5] 10 is a photograph of an example of a rectangular pattern. [Figure 6] 10 is a photograph of a comparative example of a rectangular pattern. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Action of irradiating the surface of a metal member with the pulsed laser of the present invention) In Figures 1 and 2, a pulsed laser L is irradiated onto the surface of a metal member A in a scanning manner at predetermined intervals, melting the surface of the metal member A and forming rectangular patterns 1 and 2 having multiple grooves A1.

[0010] The inventors have found that, because rectangular patterns 1, 2 formed by melting the surface of metal member A and having a plurality of recessed grooves A1 have corners 1A, 2A that intersect vertically and horizontally, surface treatment to form a continuous shape without gaps from irradiation start points 11, 21 to irradiation end points 12, 22 requires adjusting the scanning speed and scanning interval of pulsed laser L irradiation, which results in poor workability. They have also found that workability can be improved by setting the irradiation start points 11, 21 and irradiation end points 12, 22 to be irradiated with pulsed laser L at positions other than corners 1A, 2A. In this case, the rectangular patterns are formed by intersecting linear shapes vertically and horizontally, with curved corners, but both the vertical and horizontal directions or only one of them may be curved.

[0011] (Roughening of the surface to form a rectangular pattern by irradiating a pulsed laser according to the present invention) In Figures 1 and 2, the metal member A is a rectangular plate made of aluminum, copper, a copper alloy, stainless steel, or the like. A1 denotes a groove, which is a surface roughening treatment that contributes to tight bonding with the resin member. First, as shown in Figure 2, a pulsed laser beam L is irradiated onto the surface of the metal member A by scanning the surface with the pulsed laser beam L in the direction of the arrow at a predetermined scanning interval from an irradiation start point 11 through a curved corner 1A to an irradiation end point 12, thereby forming a square or rectangular pattern having multiple grooves A1. Then, the inside of the irradiation start point 11 is designated as an irradiation start point 21, and the pulsed laser beam L is irradiated from the irradiation start point 21 at a predetermined scanning interval from the irradiation start point 21 through a curved corner 2A to an irradiation end point 22, thereby forming a square or rectangular pattern having multiple grooves A1. This results in the formation of rectangular patterns 1 and 2 having multiple grooves A1 in two or more lines. In this case, the irradiation start points 11, 21 and the irradiation end points 12, 22 in the rectangular patterns 1, 2 are located in areas other than the corners 1A, 2A as shown in the figure, and the irradiation trajectory of the pulsed laser L is multiple so that the irradiation start points 11, 21 and the irradiation end points 12, 22 in each rectangular pattern 1, 2 are not aligned.

[0012] (Formation of metal-resin composite) Fig. 3 shows a method for manufacturing a metal-resin composite consisting of a metal member that has been roughened to a rectangular pattern by a pulsed laser and a resin member made of thermoplastic resin, and Fig. 4 shows the metal-resin composite. In Fig. 3, the metal member A is heated, and the resin member B made of thermoplastic resin is pressed in the direction of the arrow, melting the resin member B into the multiple grooves A1 that are roughened to a rectangular pattern, forming a metal-resin composite C in which the metal member A and the resin member B are tightly bonded by thermocompression bonding, as shown in Fig. 4. [Example]

[0013] Figure 5 is a photograph of an example, magnified 200 times, showing two rectangular patterns irradiated with a pulsed laser. In Figure 5, a rectangular aluminum plate with a thickness of 1.5 mm was used as the rectangular metal member A. A pulsed fiber laser was used to irradiate the surface of the aluminum plate with a pulsed laser at a pulse frequency of 60 kHz, a scanning speed of 500 mm / sec, and a scanning interval of 300 μm, resulting in a rectangular pattern. This rectangular pattern had two lines, with the outer rectangular pattern measuring 5 mm long and 10 mm wide, and separated by 0.3 mm from the inner rectangular pattern. In this example, the pulsed laser irradiation start point was set away from the corner, resulting in a rectangular pattern that continued continuously from the irradiation start point, through the curved corner, to the irradiation end point along each of the two irradiation trajectories. The irradiation start portions 11 and 21 and the irradiation end portions 12 and 22 in each of the two rectangular patterns are not aligned.

[0014] (Comparative Example) Figure 6 is a photograph of a comparative example, enlarged 200 times, showing two rectangular patterns irradiated with a pulsed laser. In Figure 6, the same aluminum plate as in the above-mentioned example was used, and the surface of this aluminum plate was irradiated with the pulsed laser in the same manner as in the above-mentioned example, using a fiber laser with the same pulse oscillation as in the above-mentioned example, with the irradiation start point of the pulsed laser set at a corner. As a result, it was found that in the rectangular pattern extending from the irradiation start point through the curved corner to the irradiation end point, both irradiation start points 11 and 21 and irradiation end points 12 and 22 were missing at the corner.

[0015] As shown in Figure 5, in the surface treatment of an aluminum plate, which is an example of a metal member, it was demonstrated that by setting the irradiation start and end points in the rectangular pattern to areas other than the corners and irradiating the pulsed laser, it is possible to smoothly perform roughening treatment in a continuous rectangular pattern. [Industrial Applicability]

[0016] The present invention can be used to obtain a metal-resin composite by insert molding in addition to obtaining a metal-resin composite by thermocompression bonding with a resin member. [Explanation of symbols]

[0017] 1, 2 Irradiation trajectory 1A, 2A corner 11, 21 Irradiation start site 12, 22 Irradiation end area A Metallic material A1 groove L Pulse Wave Laser

Claims

1. A metal surface treatment method in which a pulsed laser is irradiated onto the surface of a metal member and scanned at a predetermined scanning interval to perform a roughening treatment that results in a rectangular pattern having corners, characterized in that the irradiation start point and irradiation end point in the rectangular pattern are set to points other than the corners, and the pulsed laser is irradiated.

2. 2. The metal surface treatment method according to claim 1, wherein the pulsed laser is applied to a plurality of rectangular patterns, each of which is set so that the irradiation start point and the irradiation end point in each irradiation locus are not aligned.

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