JP6961159B2 - Joining method of metal member and synthetic resin molded member and its joining body - Google Patents

Description

The present invention relates to a method of joining a metal member and a synthetic resin molded member and a joint body of the metal member and the synthetic resin molded member.

In a bonded body in which a metal member is integrally molded with a thermoplastic synthetic resin and the metal and the synthetic resin are joined, the synthetic resin is distorted due to the difference in the linear expansion coefficient between the metal and the synthetic resin, and the synthetic resin material is used. Countermeasures against the occurrence of distortion such as containing an elastomer have been taken, but a joining method for obtaining a bonded body in which a metal member and a synthetic resin molded member are partially bonded without such molding has been proposed.

Patent Document 1 proposes a joining method for obtaining a bonded body of a metal member partially with a synthetic resin molded member by friction stir welding. That is, it is a method of joining a metal member and a resin member by a thermal pressure type joining method in which the resin member is softened and melted by locally applying heat and pressure from the metal member side and then solidified. A metal member that is superposed on a resin member, and while rotating a columnar rotating tool, is pressed against the metal member to generate frictional heat. The frictional heat softens and melts the resin member, and then solidifies and joins the metal member. A method of joining the metal member with the resin member has been proposed.

However, in the method of joining the metal member and the resin member in Patent Document 1, when heat and pressure are locally applied from the metal member side, the pressing member is pushed into the metal member to form a joining boundary between the metal member and the resin member. The molten resin on the surface of the resin member that is melted in the region directly below the pressing member at the joint boundary surface is directly underneath by allowing the metal member to penetrate to a depth that does not reach the surface and projecting and deforming the directly lower portion of the pressing member of the metal member toward the resin member. This is a method of joining a metal member and a resin member by a thermal pressure type joining method in which the metal member is solidified after flowing to the outer peripheral region of the region, but it is necessary to generate frictional heat so as to soften and melt the resin member.

Further, Patent Document 2 proposes another joining method in which a metal material having a thickness of 0.1 mm or more is locally joined to a resin material by frictional heat. That is, a coating film made of a thermoplastic resin is formed on one surface of the metal material, and the surface on which the coating film is formed is placed on the resin material side and superposed on the resin material. By pressing and rotating to generate frictional heat, the interface between the coating film and the resin material is heated to dissolve the two, and then cooled to integrate the two to a thickness of 0.1 mm or more. A joining method for joining a metal material and a resin material has been proposed.

However, in the method of joining the metal material and the resin material of Patent Document 2, since the coating film made of the thermoplastic resin is mixed with the resin material and integrated, frictional heat is used without damaging the resin material. However, it is necessary to select a metal material having a thickness of 0.1 mm or more and generate frictional heat so as to soften and melt the resin member by frictional heat as in Patent Document 1.

Japanese Unexamined Patent Publication No. 2015-131443 Japanese Unexamined Patent Publication No. 2009-279858

An object of the present invention is to provide a bonded body in which a metal member and a synthetic resin molded member are partially joined by a simple joining method in order to solve the above problems. In this case, the joint body that partially joins the metal member and the synthetic resin molded member includes a joint body that is locally joined, locally joined, and further joined by spot joining.

The method for joining a metal member and a synthetic resin molded member according to claim 1 of the present invention comprises a metal member made of a thin flat plate that can be easily bent and an injection-molded thermoplastic synthetic resin molded member. a polymerization step of superimposing, is pushed in the direction of the synthetic resin molded member such that a portion of the surface of the metal member Ri by the heat press device provided with a heater is protruded portion outermost surface of the synthetic resin molded member A heat pressing step of controlling the heater of the heat pressing tool to heat the protruding portion to form a melting portion and a cooling step of cooling the melting portion so that the skin layer of the above skin layer melts deeper than the melting depth. It is characterized in that a joint welding portion is formed by the above-mentioned method, and the protruding portion of the metal member is joined to the synthetic resin molded member. In the method of joining the metal member and the synthetic resin molding member according to claim 2, in claim 1, a fine uneven portion formed by laser irradiation is formed on the back surface of the metal member, and the polymerization step, the said. It is characterized in that a protruding portion of the metal member is joined to the synthetic resin molded member via the fine uneven portion by a heat pressing step and the cooling step.

The method of joining the metal member and the synthetic resin molded member of the present invention includes a polymerization step of superimposing a metal member made of a thin flat plate that is easily bent and an injection-molded thermoplastic synthetic resin molded member. part of the surface of the metal member Ri by the heat press device provided with a heater is pushed in the direction of the synthetic resin molded member so that the projecting portion, the skin layer of the outermost surface of the synthetic resin molded member is melted A bonded welded portion is formed by a heat pressing step of controlling the heater of the heat press tool to heat the protruding portion to form a molten portion and a cooling step of cooling the fused portion by controlling the heater of the heat press tool so as to melt deeper than the depth. Then, since the protruding portion of the metal member is joined to the synthetic resin molded member, a joined body in which the metal member and the synthetic resin molded member are partially joined can be obtained by a simple operation.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2 in the first embodiment of the present invention. FIG. 5 is a plan view of a joined body in which a metal member and a synthetic resin molded member are joined in the first embodiment of the present invention. It is a flowchart which shows the joining work process of the metal member of this invention, and the synthetic resin molding member. FIG. 5 is a cross-sectional view taken along the line BB of FIG. 5 in the first embodiment of the present invention. It is sectional drawing which shows the state which superposed the metal member and the synthetic resin molding member in the polymerization step of Embodiment 1 of this invention. It is sectional drawing which shows the working state which joins a metal member and a synthetic resin molding member in Embodiment 1 of this invention. It is sectional drawing which shows the working state which performs the surface treatment by laser irradiation on the back surface of the metal member in Embodiment 2 of this invention. It is a back view which shows the metal member surface-treated in Embodiment 2 of this invention. It is sectional drawing which shows the state which superposed the metal member and the synthetic resin molding member in the polymerization step of Embodiment 2 of this invention. FIG. 5 is a cross-sectional view of a joined body in which a metal member and a synthetic resin molded member are joined in the second embodiment of the present invention. FIG. 12 is a cross-sectional view taken along the line CC of FIG. 12 according to the third embodiment of the present invention. FIG. 5 is a plan view of a joined body in which a metal member and a synthetic resin molded member are joined in the third embodiment of the present invention. It is sectional drawing which shows the working state which joins a metal member and a synthetic resin molding member in Embodiment 3 of this invention. FIG. 16 is a cross-sectional view taken along the line DD of FIG. 16 in the fourth embodiment of the present invention. FIG. 16 is a cross-sectional view taken along the line EE of FIG. 16 in the fourth embodiment of the present invention. FIG. 5 is a plan view of a joined body in which a metal member and a synthetic resin molded member are joined in the fourth embodiment of the present invention. It is sectional drawing which shows the working state which joins a metal member and a synthetic resin molding member in Embodiment 4 of this invention. It is sectional drawing which shows the working state which joins a metal member and a synthetic resin molding member in Embodiment 5 of this invention. FIG. 5 is a cross-sectional view of a joined body in which a metal member and a synthetic resin molded member are joined in the fifth embodiment of the present invention.

(Embodiment 1)
A method of joining a metal member and a synthetic resin molded member and a joined body of the metal member and the synthetic resin molded member will be described with reference to FIGS. 1 to 6.

In FIGS. 1 and 2, the metal member 1 is a flat plate composed of a front surface 1A (upper surface in FIG. 1) and a back surface 1B (lower surface in FIG. 1), and the back surface 1B of the metal member 1 is injection-molded heat. It is partially and firmly bonded to the surface 2A of the plastic synthetic resin molding member 2 via the bonding welding portion 4. Reference numeral 3 denotes a heat press portion where the metal member 1 is pressed by the heat press tool HP1 described later. The shape of the metal member 1 is exemplified by a rectangular shape, and an arbitrary shape such as a circular shape and a thin flat plate of 0.1 mm or less is exemplified. In addition to such a thin flat plate, a three-dimensional shape having irregularities, for example, Although not shown, the back surface 1B may have a concave-convex shape, and the convex portion may be embedded in the front surface 2A of the synthetic resin molding member 2. Further, since at least the portion of the metal member 1 to be joined to the synthetic resin molding member 2 (the back surface 1B of the metal member 1) may be a metal material, the metal member 1 is not limited to a single metal, but a metal multilayer body in which a synthetic resin material is interposed, for example, synthetic. It may be a multi-layer film in which aluminum films are laminated on both sides of the resin film. Examples of the metal material of the metal member 1 include a metal material such as one or more metals selected from stainless steel, iron, aluminum, copper, nickel, zinc, and tin, or an alloy containing one or more metals, and silicon on the surface of the metal material. Water-repellent or oil-repellent film treatment with based resin or fluororesin, rust-preventive film treatment with benzotriazole, copper (including copper alloy), zinc plating treatment on the surface of copper (including copper alloy) The surface of iron (containing alloy) or aluminum (containing alloy) may be treated with a rust-preventive film by chromate or further treated with alumite. Examples of the material of the synthetic resin molding member 2 include a molded product injection-molded with a thermoplastic synthetic resin material (containing an inorganic filler) such as polyphenylene sulfide (PPS) resin, polypropine (PP) resin, and ABS resin.

(Joining method between metal member and synthetic resin molded member)
In FIG. 3, the joining operation of the metal member and the synthetic resin molding member is performed in the order of the polymerization step S1, the heat pressing step S2, and the cooling step S3 using the heat pressing tool HP1 and the die D. In the polymerization step S1, in FIGS. 4 and 5, the injection-molded thermoplastic synthetic resin molding member 2 is placed on the die D, and the metal member 1 and the synthetic resin molding member 2 are overlapped with each other. Next, in the heat press step S2, in a state where the metal member 1 and the synthetic resin molding member 2 are overlapped with each other, the heat press portion 3 on the surface 1A of the metal member 1 is set in the direction of the synthetic resin molding member 2 by the heat press tool HP1. Press and heat. In this case, the heat press tool HP1 exemplifies a metal material having thermal conductivity of a cylinder, but it may be in the shape of a prism, a cylinder, or a cylinder. The heat press tool HP1 is provided with a heater, and this heater controls the energization by the power supply unit G, and the skin layer on the outermost surface of the injection-molded thermoplastic synthetic resin molding member 2 (not shown). Heat at a temperature that melts deeper than the melting depth. Next, in the cooling step S3, the heat-pressed portion 3 on the surface 1A of the metal member 1 is pressed by the heat-pressing tool HP1 for a predetermined time, and after heating, the metal member 1 and the synthetic resin molding member 2 are cooled to synthesize the product. The molten portion of the surface 2A of the resin molding member 2 is solidified to form a joint welding portion 4, and the formation of the joint welding portion 4 gives a bonded body of the metal member 1 and the synthetic resin molding member 2. In this way, the method of joining the metal member 1 and the synthetic resin molding member 2 includes the polymerization step S1 in which the metal member 1 and the synthetic resin molding member 2 shown in FIGS. 4 and 5 are overlapped with each other, and the metal shown in FIG. A part of the surface 1A of the member 1 is pressed in the direction of the synthetic resin molding member 2 by the heat press tool HP1, and the metal member 1 is deeper than the depth at which the skin layer on the outermost surface of the synthetic resin molding member 2 is melted. Since the heat pressing step S2 for heating and the cooling step S3 for cooling the molten synthetic resin molded member 2, a bonded body of the metal member 1 and the synthetic resin molded member 2 can be obtained in a simple work step.

In the above-described first embodiment, the case where the heat-pressed portion 3 on the surface 1A of the metal member 1 is partially joined at one place by the heat-pressing tool HP1 has been illustrated, but so that a plurality of joint-welded parts 4 can be obtained. The heat press portion 3 may be a plurality of locations.

(Embodiment 2)
With reference to FIGS. 7 to 10, the heat press tool HP1 presses the heat press portion 3 of the surface 1A of the metal member 1 in the direction of the injection-molded thermoplastic synthetic resin molding member 2 in the same manner as in the first embodiment. Further, a method for joining the metal member 1 and the synthetic resin molding member 2 by heating at a temperature at which the skin layer on the outermost surface of the synthetic resin molding member 2 is melted deeper than the melting depth, and the method of joining the synthetic resin molding member 2 and synthesizing the metal member 1. The joint body with the resin molding member 2 will be described.

The difference from the first embodiment is that, as shown in FIGS. 7 and 8, the back surface 1B of the metal member 1 is irradiated with the laser L to perform surface treatment to form the fine uneven portion 5, and the fine unevenness is formed. The point is that the metal member 1 is joined to the synthetic resin molding member 2 via the portion 5, and the other points are the same as those of the first embodiment. In this case, as shown in FIG. 9, the region of the fine uneven portion 5 may be the entire surface of the back surface 1B of the metal member 1, but the back surface 1B of the metal member 1 is irradiated with a laser over a region wider than the region of the heat press portion 3. The fine uneven portion 5 is formed by the above. Further, in the metal member 1 , the back surface 1B is irradiated with the laser L in advance to form the fine uneven portion 5, but the back surface 1B of the metal member 1 is formed through the fine uneven portion 5 formed by the laser irradiation L. The metal member 1 and the synthetic resin molding member 2 may be joined to each other. Therefore, although not shown, the synthetic resin molding member 2 is placed on the die D, and the metal member 1 and the synthetic resin molding member 2 are overlapped with each other. The laser L may be irradiated during the polymerization step to form the fine uneven portion 5, or the laser L may be irradiated during the heat press step to form the fine uneven portion 5. The surface 1A of the metal member 1 may be pressed and heated in the direction of the synthetic resin molding member 2 by the heat press tool HP1. The metal member 1 is formed into the synthetic resin molded member 2 so that the fine uneven portion 5 formed on the back surface 1B of the metal member 1 faces the surface 2A of the thermoplastic synthetic resin molded member 2 which has been injection-molded in this way. As shown in FIG. 10, the heat-pressing tool HP1 presses the heat-pressed portion 3 on the surface 1A of the metal member 1 in the direction of the synthetic resin molding member 2 and the skin on the outermost surface of the synthetic resin molding member 2. The metal member 1 is heated at a temperature at which the layer is melted deeper than the melting depth to form a melted portion that has entered the fine uneven portion 5, and is cooled and solidified so that the joint welding portion 4 of the synthetic resin molding member 2 is the metal member 1. Since it is formed with the fine uneven portion 5 on the back surface 1B, a bonded body of the metal member 1 and the synthetic resin molded member 2 having higher bonding strength as compared with the first embodiment can be obtained.

In the second embodiment, the heat-pressed portion 3 that presses and heats the surface 1A of the metal member 1 in the direction of the injection-molded thermoplastic synthetic resin molded member 2 with the heat-pressing tool HP1 is 1 as in the first embodiment. Although the locations are illustrated, a plurality of locations may be used. In this case, a joint body having different joint strengths may be formed by pressing and heating a portion having no fine uneven portion 5 with the heat press tool HP1. Further, a plurality of lasers L may be irradiated to the back surface 1B of the metal member 1 at intervals to form a plurality of fine uneven portions 5. Further, the region of the fine uneven portion 5 may be made narrower than the region of the heat press portion 3.

(Embodiment 3)
With reference to FIGS. 11 to 13, the metal member is pushed in the direction of the synthetic resin molded member by a heat press tool different from that of the first embodiment, and the metal member is melted by the skin layer on the outermost surface of the synthetic resin molded member. A method of joining a metal member and a synthetic resin molded member, which is characteristic of the heat pressing process, and a joining body of the metal member and the synthetic resin molded member will be described.

The thermoplastic synthetic resin molding member 2 injection-molded in the polymerization step S1 in the same manner as in the first embodiment is placed on the die D, and the metal member 1 and the injection-molded thermoplastic synthetic resin molding member 2 are overlapped with each other. match. Next, in the heat press step S2, the heat press portion 31 of the surface 1A of the metal member 1 was pushed in the direction of the synthetic resin molding member 2 by the heat press tool HP2, and the protruding portion 6 of the metal member 1 was injection-molded. The outermost surface of the synthetic resin molded member 2 is heated deeper than the melting depth of the skin layer to form a molten portion. In this case, the heat press tool HP2 is a metal material of a cylinder or a prism, and the tip is formed in a spherical shape. This heat press tool HP2 is provided with a heater as in the first embodiment, and this heater controls energization by the power supply unit G to a depth equal to or greater than the depth at which the skin layer on the outermost surface of the synthetic resin molding member 2 melts. After heating at a temperature at which it is deeply melted, it is cooled in the cooling step S3. By cooling the metal member 1 and the synthetic resin molding member 2 in this way, the molten portion of the surface 2A of the synthetic resin molding member 2 is solidified to form a joint welding portion 41, and the joint welding portion 41 is formed. By forming, the metal member 1 and the synthetic resin molded member 2 are joined together, and the metal member 1 and the synthetic resin molded member 2 have higher joining strength due to the presence of the protruding portion 6 of the metal member 1 as compared with the first embodiment. The body is obtained.

In the third embodiment, the heat press portion 31 that presses and heats the surface 1A of the metal member 1 in the direction of the synthetic resin molding member 2 with the heat press tool HP2 is exemplified at one location, but may be a plurality of locations. In this case, the heat-pressed portion 31 by the heat-pressing tool HP2 and the heat-pressed portion 3 by the heat-pressing tool HP1 shown in the first embodiment may be used in combination to distribute different bonding strengths.

To push the metal member 1 in the direction of the synthetic resin molding member 2 with the heat press tool HP2 and heat the metal member 1 deeper than the depth at which the skin layer on the outermost surface of the synthetic resin molding member 2 melts. As the material of the metal member 1, a thin flat plate that can be easily bent, for example, a metal material having a thickness of 0.1 mm or less (alloy containing), stainless steel, etc. is desirable, but the back surface 1B of the metal member 1 is made uneven. A certain three-dimensional shape (not shown) may be formed, and the convex portion thereof may be embedded in the surface 2A of the synthetic resin molding member 2 to increase the bonding strength between the metal member 1 and the synthetic resin molding member 2. As in the second embodiment, a fine uneven portion 5 may be formed on the back surface 1B of the metal member 1 to further increase the joint strength between the metal member 1 and the synthetic resin molding member 2.

(Embodiment 4)
With reference to FIGS. 14 to 17, the elongated metal member is pressed in the direction of the synthetic resin molded member by a heat press tool different from that of the first embodiment, and the metal member is pressed against the outermost surface of the synthetic resin molded member. A method of joining a metal member and a synthetic resin molded member, which is characteristic of the heat pressing process in which the skin layer is heated deeper than the melting depth, and a bonded body of the metal member and the synthetic resin molded member will be described.

In FIGS. 14 to 16, the metal member 1 is a pair of long metal plates composed of a front surface 1A (upper surface in the drawing) and a back surface 1B (lower surface in the drawing), and the materials thereof are stainless steel, iron, and aluminum. , Metallic materials such as one or more metals selected from copper, nickel, zinc and tin or alloys containing one or more metals can be exemplified. The back surface 1B around one end of the metal member 1 is made of a thermoplastic synthetic resin material (including an inorganic filler) such as polyphenylene sulfide (PPS) resin, polypropine (PP) resin, and ABS resin as in the first embodiment. The molten portion of the surface 2A of the injection-molded synthetic resin molding member 2 is cooled and solidified to form a bonding portion 4, and the bonding is performed by forming the bonding welding portion 4, and heat pressing is performed for this bonding. The tool HP3 is used, and the heat press portion 3 is exemplified at one location, but may be joined at a plurality of locations. Since the metal member 1 has a long shape, only the metal member 1 can be projected from the end of one end in the direction of the other end to be connected or connected to another member. As an example of connecting or connecting to or connecting to other members by projecting only the metal member 1 in the other end direction, a bus bar used for connecting to a power feeding unit such as an injector circuit of an automobile engine or a control circuit of a motor can be exemplified. This bus bar is formed of a synthetic resin molding material so as to be a power supply connector, and is generally formed by insert molding. However, as a power supply connector having a long shape and a bus bar formed, for example, a plurality of power supply connectors In the insert molding method in the case of arranging in series, the primary molding cavity in which the bus bar is set and filled with the resin and the secondary molding cavity having the connector molding portion are separately or in Japanese Patent Application Laid-Open No. 2002-154131. An invention has been proposed in which primary molding and secondary molding are simultaneously performed with one mold to obtain an insert-molded product having a length longer than the longest moldable size of the insert molding machine. However, it is necessary to simplify the workability, and further, there is a limitation on the size of the long insert molded product in terms of manufacturing the insert molding die apparatus. For this insert molding, only the metal member 1 according to the fourth embodiment is projected toward the other end, and the metal member 1 and the synthetic resin molding member 2 are joined by a method of joining the metal member 1 with the metal member 1 by a simple operation. A bonded body with the resin molding member 2 can be obtained.

Next, a method of joining the metal member and the synthetic resin molding member will be described below with reference to FIGS. 3 and 17.

Similar to the first embodiment shown in FIG. 3, the metal member and the synthetic resin molding member are joined in the order of the polymerization step S1, the heat pressing step S2, and the cooling step S3. Although not shown in the polymerization step S1, the end portion of the metal member 1 and the injection-molded thermoplastic synthetic resin molded member 2 are overlapped with each other. Next, in the heat press step S2, the metal member 1 is used by the heat press tool HP3 shown in FIG. 17 in a state where the end portions of the pair of metal members 1 and the injection-molded thermoplastic synthetic resin molded member 2 are overlapped with each other. Is injected deeper than the depth at which the skin layer on the outermost surface of the thermoplastic synthetic resin molded member 2 is injection-molded in the direction of the synthetic resin molded member 2 placed on the die D to form a molten portion. do. In this case, the heat press tool HP3 is a metal material having a pair of columnar legs for pressing the surfaces 1A of the pair of metal members 1, and the tip thereof is formed to be flat. The heat press tool HP3 is provided with a heater as in the first embodiment, and the heater controls the energization by the power supply unit G so that the skin layer (not shown) on the outermost surface of the synthetic resin molding member 2 is formed. After heating at a temperature at which melting is deeper than the melting depth, cooling is performed in the cooling step S3. By cooling the molten portion of the surface 2A of the synthetic resin molding member 2 in this way, as shown in FIGS. 14 and 15, the molten portion of the surface 2A of the synthetic resin molding member 2 is solidified to form the welded welded portion 4. The metal member 1 and the synthetic resin molding member 2 are formed to form a joint body between the metal member 1 and the synthetic resin molding member 2 by forming the joining and welding portion 4, and are useful for joining a shape that cannot fit in the molding mold. Bonds are obtained.

(Embodiment 5)
With reference to FIGS. 18 and 19, a long metal member similar to that of the fourth embodiment is pressed in the direction of the synthetic resin molded member by a different heat press tool, and the metal member is pressed to the outermost part of the synthetic resin molded member. A method of joining a metal member and a synthetic resin molded member, which is characteristic of the heat pressing process in which the skin layer on the surface is heated deeper than the melting depth, and a bonded body of the metal member and the synthetic resin molded member will be described.

In FIG. 18, the heat press tool HP4 is a metal material having a pair of columnar legs for pressing the surface 1A of a pair of metal members 1 similar to the heat press tool HP3 shown in the fourth embodiment, and the tip is the heat press tool HP3. Unlike, it is formed in a spherical shape. Using this heat press tool HP4, the heat press portion 31 of the surface 1A of the metal member 1 is placed on the die D by the heat press tool HP4 in the heat press step S2 (see FIG. 3). It is pushed in the direction of the synthetic resin molded member 2 and heated deeper than the depth at which the skin layer on the outermost surface of the injection-molded thermoplastic synthetic resin molded member 2 is melted to form a melted portion. Next, by cooling the molten portion in the cooling step S3 (see FIG. 3), a joint welding portion 41 is formed, and the joint welding portion 41 is formed by forming the metal member 1 as shown in FIG. The protruding portion 6 formed on the back surface 1B is pushed into the synthetic resin molding member 2 to form a strong joint, which is a joint between the metal member 1 and the synthetic resin molding member 2 which is useful for joining a shape that cannot fit in the molding die. Is obtained.

The heat press tool HP3 and the heat press tool HP4 shown in the fourth and fifth embodiments may be used for each of the pair of metal members 1. At that time, the heat press tool HP3 and the heat press tool HP4 are not formed into a shape having a pair of legs, but are connected in an annular shape and used as a cylinder or a square cylinder to form an annular welded welded portion 4, 41. May be obtained.

In this way, the metal member 1 and the injection-molded thermoplastic synthetic resin molded member 2 are superposed, and a part of the surface 1A of the metal member 1 is made of a synthetic resin by the heat press tools HP1, HP2, HP3 and HP4. While pressing in the direction of the molding member 2, the metal member 1 is heated so as to melt deeper than the depth at which the skin layer on the outermost surface of the synthetic resin molding member 2 melts to form a melted portion, and then the melted portion is formed. by causing the cooling and solidification, to form a bonding welding site 4 and 41, the formation of the joint sealing spot 4 and 41, the joined body of the metallic member 1 and the synthetic resin molded member 2 is obtained. In this case, it is illustrated that the heat press tools HP1, HP2, HP3 and HP4 are provided with heaters so as to heat the synthetic resin molding member 2 via the metal member 1, but the principle of the present invention is patented. A part of the surface 1A of the metal member 1 is pressed in the direction of the injection-molded thermoplastic synthetic resin molded member 2 and the metal member 1 is pressed against the synthetic resin molded member 2 regardless of the frictional heat as in Documents 1 and 2. The melted portion formed by heating so that the skin layer on the outermost surface of the above surface melts deeper than the melting depth is cooled and solidified to form the joint welding sites 4 and 41. If the heat press tools HP1, HP2, HP3 and HP4 used do not have a built-in heater and use another heat source to heat the metal member, only the function of pressing the metal member 1 in the direction of the synthetic resin member 2 is provided. You just have to have it.

The present invention is useful for joining a part having a shape that cannot fit in a molding die, and is useful for joining a part of a member that is easily damaged by heat such as a semiconductor chip due to the joining work. It is useful for separate recycling of metal members and synthetic resin molded members by reheating at a temperature equal to or higher than the glass transition temperature of the synthetic resin. Further, since there is a difference in the linear expansion rate between the metal member and the synthetic resin molded member in the joint body between the metal member and the synthetic resin molded member, it is more partial than joining the metal member and the synthetic resin molded member on the entire surface. It is useful for joining a metal member of an automobile body and a synthetic resin molded member because it is easier to prevent deformation of the joined body due to linear expansion.

1 Metal member 2 Synthetic resin molding member 3, 31 Heat press part

Claims (2)

Bending the metal member made of easily made thin flat plate and a polymerization step of overlapping the thermoplastic synthetic resin molded member which is injection-molded, the surface of the metal member Ri by the heat press device provided with a heater The heater of the heat press tool is pushed in the direction of the synthetic resin molding member so that a part thereof becomes a protruding portion, and the heater of the heat press tool is melted deeper than the melting depth of the skin layer on the outermost surface of the synthetic resin molding member. A joint welding site is formed by a heat pressing step of controlling and heating the protruding portion to form a molten portion and a cooling step of cooling the molten portion, and the protruding portion of the metal member is joined to the synthetic resin molded member. A method for joining a metal member and a synthetic resin molded member. A fine uneven portion formed by laser irradiation is formed on the back surface of the metal member, and the protruding portion of the metal member is formed on the synthetic resin molded member by the polymerization step, the heat pressing step, and the cooling step. The method for joining a metal member and a synthetic resin molded member according to claim 1, wherein the metal member is joined via a portion.

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