JP2020040369A - Jig for thermal press bonding and method for manufacturing composite body - Google Patents

Abstract

To provide a jig for thermal press bonding for manufacturing a composite body having a high bond strength in which a metal material and a resin material are bonded to each other, with good work efficiency.SOLUTION: A jig 0 for thermal press bonding for thermal press bonding a coated metal contouring material 1 having an organic resin layer 3 and a resin material 4 on at least one surface in a metal contouring material 2 to manufacture a composite body 8 includes a body part 31 having a mounting surface 33 provided with an opening 32 and a support part 34 arranged so as to be adjacent to the opening 32, in which in the body part 31, the coated metal contouring material 1 is mounted on the mounting surface 33, the opening 32 has a height of an inner wall surrounding the opening equal to or higher than the resin material 4, and the support part 34 includes pressing means 35 for pressing the resin material 4 filling the inside of the opening 32.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a jig for thermocompression bonding and a method for manufacturing a composite using the jig for thermocompression bonding to manufacture a composite of a painted metal base material and a resin material.

  As a technique for integrating a metal material and a resin material, a method of bonding with an adhesive is generally known. In order to obtain the required bonding strength, an adhesive and bonding conditions suitable for the materials of the metal product and the resin product to be bonded are selected. However, the joining method using an adhesive requires a step of applying the adhesive to the object to be joined and a subsequent step of heating or drying, and thus requires a lot of work time.

  Therefore, instead of a bonding method using an adhesive, a bonding method for directly bonding a metal material and a resin material has been studied. For example, Patent Literature 1 proposes a method of manufacturing a composite in which a resin material is joined to the surface of an organic resin layer in a painted metal base material by injection molding or heat compression to join both members.

JP 2014-159126 A

  In the automotive field, materials are selected for the purpose of weight reduction, and the use ratio of resin materials is increasing. Therefore, the number of joints between the metal material and the resin material is increasing, and work efficiency in the process of joining the metal material and the resin material is improved, and a technique for manufacturing a composite having high joining strength has been established. It has been demanded.

  According to the example described in Patent Literature 1, in the manufactured composite, the organic resin layer and the resin material are in contact with each other in a region of 30 mm width × 30 mm length (paragraph 0079). The bonding strength of the composite according to the tensile test indicates a maximum of 2.5 kN (Table 3). When this bonding force is divided by the area of the contact area (30 mm × 30 mm), it is calculated to be about 2.8 MPa. That is, the composite of Patent Literature 1 does not have sufficiently high bonding strength when viewed in terms of shear bonding strength per unit area.

  Since the volume of the resin material shrinks during the cooling process after melting, Patent Document 1 discloses that when the resin material is joined by an injection molding method, a material having a molding shrinkage of 1.1% or less is required. (Paragraph 0038) is also described, and when a resin material having a large molding shrinkage is used, it is necessary to include a filler in the resin material (Paragraph 0040). As described above, the bonding method of Patent Document 1 has restrictions on the resin composition to which it is applied.

  Further, in the case of using the thermocompression bonding method disclosed in Patent Literature 1, when the coated metal plate and the resin molded body are overlaid and thermocompression bonded, the surface of the resin molded body is melted by heating and easily deformed by pressure. As the thermocompression bonding proceeds, the deformed portion of the resin spreads around the resin molded body and is cooled and solidified as it is. The deformed resin portion solidified around the resin molded body impairs the appearance of the composite after joining. Therefore, a processing step for removing the resin deformed portion after the joining is required. From the viewpoint of workability, it is desirable that the process of removing the resin deformed portion can be omitted.

  The present invention has been made in view of the above-described circumstances, and a heat-compression jig for manufacturing a composite having a high joining strength in which a metal material and a resin material are joined with good working efficiency. The purpose is to provide.

The present inventors have studied to achieve the above object, and as a result, using a coated metal material having an organic resin layer, heat generation is performed on a bonded body in which the coated metal material and the resin material are stacked. It has been found that by performing a heat treatment by means, a composite of a painted metal base material and a resin material can be easily produced, and a composite having high bonding strength can be obtained. Then, in the jig used for the heat-compression bonding work, it was found that the workability was further improved by providing the pressing means in the support structure of the resin material, and the present invention was completed. Specifically, the present invention provides the following.

(1) The present invention is a thermocompression bonding jig for producing a composite by thermocompression bonding a resin material and a coated metal material having an organic resin layer on at least one surface of the metal material. A main body having a mounting surface provided with an opening, and a supporting portion disposed adjacent to the opening, wherein the main body is provided on the mounting surface with the coated metal element. The height of an inner wall surrounding the opening is greater than or equal to the height of the resin material, and the support portion presses the resin material loaded inside the opening. It is a jig for thermocompression bonding provided with pressurizing means.

(2) The present invention is the jig for thermocompression bonding according to (1), wherein the pressing unit includes a supporting unit that is in contact with the resin material, and a pressing unit that moves the supporting unit.

(3) The present invention is the jig for thermocompression bonding according to (1) or (2), wherein the pressurizing means has a portion that enters the opening.

(4) In the present invention, the coated metal element and the resin material are heat-pressed with the jig for heat and pressure according to (1) or (2), so that the coated metal element is A method for producing a composite, comprising producing a composite with the resin material.

(5) In the present invention, the coated metal base material and the resin material are overlapped, and the first surface of the coated metal base material on which the organic resin layer is provided and the surface of the resin material face each other. Producing a joined body; thereafter, in the joined body, disposing a heating means on a second surface of the painted metal base material located on a side opposite to the first surface; Means is pressed against the second surface to bring the coated metal material into close contact with the resin material, and the heat-generating means performs a heat treatment on the article to be joined, (4) The method for producing a composite according to (4), further comprising: joining the resin material and the resin material to produce a composite of the painted metal base material and the resin material.

  ADVANTAGE OF THE INVENTION According to this invention, the composite which has high joining strength which the metal material and the resin material were joined can be provided. In addition, it is possible to provide a method for easily producing the composite and producing the composite with good working efficiency.

It is a schematic diagram for demonstrating the process in which a coating metal base material and a resin material are joined by thermocompression bonding, and shows the form before heating, and (b) shows the form at the time of heating. It is a figure which shows the aspect which heat-compression-bonds a coating metal base material and a resin material by a heating means. It is a figure showing the example of the history of a heating process. It is a figure which shows an example of the jig | tool for heat-compression-bonding a coating metal base material and a resin material. It is a figure for explaining the jig for thermocompression bonding concerning this embodiment, and shows a mode before thermocompression bonding is performed. It is a figure for explaining the jig for thermocompression bonding concerning this embodiment, and shows the mode in which thermocompression bonding is performed. It is a figure showing the whole appearance of the jig for thermocompression bonding concerning this embodiment. It is a figure which shows the jig | tool for thermocompression bonding concerning this embodiment divided into a main-body part and a support part. It is a figure which shows the position which combined the coating metal base material and the resin material in an Example. It is a figure which shows typically the test device which measures a shear joint strength. FIG. 6 is a view showing an appearance of a resin material after bonding in Test Example 2 of Examples.

  Hereinafter, embodiments according to the present invention will be described. The present invention is not limited to the following description.

  A method for manufacturing a composite of a painted metal base material and a resin material to which the jig for thermocompression bonding according to the present embodiment is applied will be described. As schematically shown in FIG. 1, a composite body 8 in which a coated metal base material 1 having an organic resin layer 3 on at least one surface of a metal base material 2 and a resin material 4 are joined to each other in the following steps It is manufactured according to. That is, the manufacturing method according to the present embodiment includes: (1) manufacturing the joined body 5 in which the painted metal base material 1 and the resin material 4 are combined; (2) the first surface 6 of the joined body 5 (3) Pressing the second surface 7 of the article 5 by the heat generating means 10 and applying heat treatment to the article 5 for joining. . According to this manufacturing method, the bonding portion 9 is formed at the interface between the painted metal base material 1 and the resin material 4, and the composite body 8 having high bonding strength (shear bonding strength) is obtained.

(1) Production of a body to be joined The production method according to the present embodiment comprises, as shown in FIGS. The joined body 5 in which the first surface 6 of the profile 1 on which the organic resin layer 3 is provided and the surface of the resin material 4 face each other is produced. As shown in FIG. 1B, the coated metal base material 1 and the resin material 4 are joined via the organic resin layer 3 by the heat treatment described later. Therefore, it is preferable that the object 5 to be subjected to the heat treatment has a form in which the first surface 6 of the painted metal base material 1 and the resin material 4 are overlapped so as to face each other.

(2) Arrangement of Heating Means Subsequently, as shown in FIG. 2, the heat generating means is provided on the second surface 7 of the coated metal base material 1 located on the side opposite to the first surface 6 in the article 5 to be joined. 10 is arranged. In the interface region where the coated metal base material and the resin material face each other, since the heat compression treatment by the pressing process and the heating process described below is performed, the pressurization and the heating efficiently act on the interface region. It is preferable to dispose the heat generating means at a position corresponding to the interface region.

  The form of the heat generating means 10 is not particularly limited as long as it has a function of pressing the surface of the joined body and a function of heating the joined body. For example, "Pulse Heat Unit" (model NA-154) manufactured by Nippon Avionics Co., Ltd. can be used. This heat generating means is a device for heating the object to be bonded through the front end portion by generating heat by resistance heating at the front end portion (heater chip).

(3) Heat Compression Treatment by Heating Means Next, as shown in FIG. 2, the heat generating means 10 is pressed against the second surface 7 of the painted metal base material. In the interface region where the coated metal base material 1 and the resin material 4 face each other due to this pressing, the organic resin layer 3 of the coated metal base material and the resin material 4 are in close contact with each other, and the two are in close contact with each other. By pressing and heating the object by the heat generating means, softening and melting occur in the interfacial region, thereby forming a joint between the painted metal base material and the resin material.

  The heat treatment according to the present embodiment is performed with the above-described pressing. FIG. 3 shows an example of a heating history at the time of performing the heat treatment. The heat treatment includes heating the object to be bonded from the normal temperature 21 to the set temperature 22 by the heat generating means, and then holding the heat generating means 10 at the set temperature 22. Further, the heat treatment includes, after stopping the heating of the heating means, cooling while maintaining the pressing. Thus, the heat treatment includes a step of raising the temperature, a step of holding, and a step of cooling. Appropriate heating time 23, holding time 24, and cooling time 25 can be selected according to the type of the coated metal base material or the resin material.

  If the heating time (s) to the set temperature is 0.1 s or more, a composite with high bonding strength can be obtained. Even if the temperature is raised for a long time, the increase in bonding strength is saturated, so that the temperature raising time is preferably 5 s or less. If the holding time (s) after reaching the set temperature is 0.1 s or more, a composite having high bonding strength can be obtained. Even if it is held for a long time, the increase in bonding strength is saturated, so that a holding time of 5 s or less is preferable.

(Painted metal material)
The coated metal material used in the present embodiment has an organic resin layer provided on one or both surfaces of the surface of the metal material. The type of metal constituting the metal base material is not particularly limited. For example, the type of the metal may be iron, a metal other than iron, or an alloy. Examples of the metal shaped material include cold-rolled steel sheets, galvanized steel sheets, Zn-Al alloy-plated steel sheets, Zn-Al-Mg alloy-plated steel sheets, aluminum-plated steel sheets, stainless steel sheets (austenitic, martensitic, ferrite, (Including ferrite and martensite two-phase systems), aluminum plates, aluminum alloy plates, metal plates such as copper plates, and pressed products, or cast and forged products such as aluminum die-casting and zinc die-casting, cutting, and powder metallurgy Various metal members formed by the above method are included. The metal preform may have been subjected to a known coating pretreatment such as degreasing or pickling, if necessary.

  The organic resin layer improves the adhesion between the metal base material and the molded article of the thermoplastic resin composition. Examples of the organic resin layer include olefin resins such as polypropylene, polyurethane, acrylic resins, acrylic / styrene resins, vinyl acetate, EVA (ethylene-vinyl acetate copolymer), and ester resins.

  The thickness of the organic resin layer is preferably 0.2 μm or more. When the thickness of the organic resin film is less than 0.2 μm, it may not be possible to uniformly cover the surface of the metal base material. As a result, in a composite having an organic resin layer having a thickness of less than 0.2 μm, a minute gap may be generated between the metal base material and the resin material. When the minute voids are formed, the sealing property of the composite may be reduced. On the other hand, the upper limit of the thickness of the organic resin film is not particularly limited, but is preferably 10 μm or less, more preferably 3 μm or less. Even if the thickness of the organic resin layer exceeds 10 μm, no remarkable improvement in performance is observed, and it is disadvantageous from the viewpoints of productivity and cost.

(Resin material)
The resin material used in the present embodiment is not particularly limited. The present invention can be applied to those containing polyethylene resin, polypropylene resin, polybutylene terephthalate resin, polyamide resin, polyphenylene sulfide resin, acrylonitrile-butadiene-styrene resin, polyvinyl chloride resin, polycarbonate resin, and the like.

(Complex)
By the manufacturing method according to the present embodiment, it is possible to obtain a composite in which the above-described coated metal base material and the above-described resin material are joined, and to provide a composite having a shear joining strength per unit area of 20 MPa or more. it can. In this specification, the shear joint strength (unit: Pa) is obtained by dividing the peak load (unit: N) obtained in the tensile test by the area (mm ² ) where the painted metal base material and the resin material come into contact with each other. Means the numerical value calculated as the shear bonding strength per unit area. In this specification, the shear bonding strength may be referred to as “bonding strength”. Since the composite according to the present invention has a shear bonding strength of 20 MPa or more, it is suitable for many uses requiring weight reduction.

  Further, in the manufacturing method according to the present embodiment, there is no particular limitation on the type of the resin material used. Before the joining, the resin material is put into a drying oven to evaporate the water in the resin, so that the influence of the water in the resin material can be avoided. Therefore, even if a highly water-absorbing resin material such as PA6 (6 nylon) is used, the painted metal base material and the resin metal body can be satisfactorily joined.

(Jig for heat compression)
The jig for fixing the resin material is used for the thermocompression bonding between the painted metal base material and the resin material. As an example, a positioning jig shown in FIG. 4 can be used. As shown in FIG. 4, the resin material 4 is accommodated in the concave portion 12 of the positioning jig 11. The positioning jig 11 has the same length and width as the painted metal base material 1, and has a recess 12 having a predetermined depth to accommodate the resin material 4. The concave portion 12 is provided at a position separated by a predetermined length in the longitudinal direction from one end of the positioning jig 11 and at a substantially central position in the width direction. The resin material 4 accommodated in the concave portion 12 is in a state where a predetermined length protrudes. Thereafter, the coated metal base material 1 is placed on the positioning jig 11 to obtain the joined body 5 in a state where the organic resin layer 3 of the coated metal base material 1 and the resin material 4 face each other.

  Next, the heating means 10 is arranged on the surface 7 of the coated metal base material 1 in the article 5 to be joined, and the article 5 is pressed and heated. By such a heat-compression bonding process, a composite body in which the painted metal base material 1 and the resin body 4 are joined is obtained.

  When the positioning jig shown in FIG. 4 is used, the resin material 4 protruding from the concave portion 12 of the positioning jig 11 is deformed by heat compression, and the joint between the painted metal base material 1 and the resin material 4 is deformed. In 9, the molten resin often spreads around the recess 12 like the resin deformed portion 17 and solidifies. For applications where a beautiful appearance is required at the joint of the composite, it is preferable to remove the resin deformed portion 17 described above.

  On the other hand, it is preferable in terms of working efficiency that the post-processing for removing the resin deformed portion 17 can be omitted. From such a viewpoint, the jig for thermocompression bonding according to the present embodiment is capable of thermocompression bonding without protruding the resin material in order to suppress resin deformation during thermocompression bonding. 5 and 6 show a specific device configuration. FIG. 5 shows an aspect before the thermocompression bonding, and FIG. 6 shows an aspect during the thermocompression bonding.

  The jig for thermocompression bonding according to the present embodiment includes a main body having a mounting surface provided with an opening, and a support portion arranged adjacent to the opening. As shown in FIG. 5, the painted metal base material 1 is placed on the placement surface 33 of the main body 31. The resin material 4 to be joined is loaded inside the opening 32 of the main body 31. The support portion 34 of the jig 30 has a pressurizing means 35, which has a function of pressing the resin material 4 loaded in the opening 32 of the main body 31. The support section 34 has a member for fixing the pressurizing unit 35.

  As shown in FIG. 5, the coated metal base material 1 and the resin material 4 are arranged such that the first surface 6 of the coated metal base material 1 on which the organic resin layer 3 is provided and the surface of the resin material 4 face each other. To be joined 5 is prepared. Then, the heat generating means 10 is arranged on the second surface 7 of the painted metal base material 1 located on the opposite side of the first surface 6 of the painted metal base material 1. At the stage before the thermocompression bonding, one end of the resin material 4 loaded in the opening 32 is pressed by the pressing means 35 of the support portion 34, and the other end is placed on the mounting surface 33 of the main body 31. It is in a state protruding from.

  Next, at the time of thermocompression bonding, as shown in FIG. 6, the heating means 10 is pressed against the second surface 7 of the painted metal base material 1 to bring the painted metal base material 1 and the resin material 4 into close contact with each other. At the same time, the object to be joined 5 is subjected to a heat treatment by the heat generating means 10 to join the coated metal base material 1 and the resin material 4. The pressing by the heat generating means 10 is performed with a pressing force exceeding the pressing force of the pressing means 35 in the jig 30 for heat and pressure bonding. As the painted metal base material 1 is pressed and moves, the resin material 4 in close contact with the painted metal base material 1 is pushed into the opening 32. The painted metal base material 1 comes into contact with the mounting surface 33 of the jig 30 for heating and crimping, and the movement of the coated metal base material 1 stops. As a result, the entirety of the resin material 4 is loaded into the opening 32 and does not protrude. Then, while maintaining a state in which a constant pressing force is applied to the interface region where the coated metal base material 1 and the resin material 4 are in contact with each other, a heat treatment is performed by the heating means 10 to heat the object 5. Crimp.

  The resin material 4 loaded in the opening is in a state of being restrained by the inner wall of the opening 32. At the time of thermocompression bonding, while being pressed from the coated metal base material side, it is also pressed from the support part by the pressing means. When the height of the inner wall of the opening is equal to or higher than the height of the resin material, the entire resin material is constrained by the inner wall of the opening, which is preferable in that the deformation of the resin material is suppressed.

  As shown in FIGS. 5 and 6, the pressing means 35 of the support part 34 can be constituted by a supporting means 36 in contact with the resin material 4 and a pressing means 37 for moving the supporting means 36. Since the support means 36 supports the resin material 4 in the opening 32, the support means 36 has a portion that enters the opening 32, and preferably has a shape and a size suitable for supporting the resin material 4. . The pressing means 36 may be any as long as it has a mechanism for generating a predetermined pressing force. For example, the spring pressing means is simple in mechanism and adjustment. Further, control means can be added to the pressing means by the cylinder mechanism. For example, one end of the support means may have a flat surface that enters the opening and contacts the end surface of the resin material. The other end of the supporting means can be a flat surface in accordance with the pressing surface of the pressing means.

  When the thermocompression bonding jig according to the present embodiment is used, deformation of the resin material during thermocompression bonding is suppressed, and the resin can be prevented from flowing out of the resin material body. Therefore, in the joint portion of the obtained composite, the resin deformed portion that has flowed out around the resin material hardly remains, so that a beautiful appearance can be obtained in the joint portion of the composite. In addition, the post-processing for removing the resin deformed portion can be omitted, or the operation can be performed with a simple operation, which is effective in improving workability.

  Also, when the resin flows out of the main body of the resin material like a resin deformed portion during the thermocompression bonding, it is considered that a part of the organic resin layer flows out together with the resin. With the outflow of the resin, the organic resin layer may be worn, which may cause a decrease in bonding strength. In this regard, in the thermocompression bonding jig according to the present embodiment, since the bonding by thermocompression bonding is performed while substantially maintaining the shape of the resin material, the organic resin layer does not wear due to deformation of the resin material. Therefore, a good bonding interface is formed between the organic resin layer and the resin material, and a composite having high bonding strength can be manufactured.

  Hereinafter, examples will be described. The present invention is not limited to the following examples.

  A specimen was prepared in which the surface of the painted metal base material provided with the organic resin layer and the surface of the resin material faced each other. Specifically, a hot-dip Zn-Al-Mg alloy-plated steel sheet using SPCC as a base material was used as the coated metal base material 1. The coated metal material 1 has a 2 μm-thick organic resin layer 3 made of urethane resin on both sides of a metal material 2 having a thickness of 0.6 mm, and has dimensions of 75 mm in length and 25 mm in width. And was subjected to the test.

  As the resin material 4, a plate-like product having a length of 10 mm, a width of 5 mm, and a thickness of 3 mm was prepared using two kinds of resins, polyamide 6 (PA6) and polypropylene (PP).

  FIG. 7 shows the entire appearance of the thermocompression bonding jig 30 according to the present embodiment. FIG. 8 is a diagram showing the jig 30 divided into a main body portion 31 and a support portion 34. . A bonding test by thermocompression was performed using the thermocompression bonding jig 30 shown in FIGS. The resin material 4 is loaded into the opening 32 of the thermocompression bonding jig 30. The main body 31 of the jig 30 has a mounting surface 33 on which the coated metal material 1 is mounted. The mounting surface 33 has the same length and width as the painted metal base material 1, and as shown in FIG. 9, the opening 32 for loading the resin material 4 is provided on the mounting surface 33. Is provided at a position about 15 mm apart from one end in the longitudinal direction and substantially at the center in the width direction. Further, a stopper 38 is provided adjacent to one end of the mounting surface. By bringing the coated metal base material 1 into contact with the stopper 38, the coated metal base material 1 can be accurately placed at the joint with the resin material 4.

  The thermocompression bonding jig 30 has a supporting portion 34 provided with a pressing means 35 adjacent to the opening 32 of the main body 31. The pressing unit 35 includes a supporting unit 36 for supporting the resin material 4 accommodated in the opening 32 and a spring member as a pressing unit 37 for moving the supporting unit 36. One end of the support means 36 has a shape corresponding to the internal shape of the opening 32, and the other end of the support means 36 has a flat surface so as to be pressed by the spring member of the pressing means 37. It is configured. When the resin material 4 is loaded into the opening 32, the resin material 4 is pressed by the pressing means 35 of the support portion 34 and is in a state of protruding from the mounting surface 33. Thereafter, the coated metal base material 1 is put on the resin material 4 and the jig 30 for thermocompression bonding, and the joined body 5 in a state where the organic resin layer 3 of the coated metal base material 1 and the resin material 4 face each other. To obtain a specimen consisting of

  Next, the heat generating means 10 is arranged on the second surface 7 of the coated metal preform 1 in the article 5 to be pressed and heated with respect to the article 5 to be coated. 1 and the resin body 4 are joined. As a heat generating means, a pulse heat unit (model NA-154) manufactured by Nippon Avionics Co., Ltd. was used. The heat generating means includes a head (not shown) for pressing the object to be bonded and applying a predetermined load, and a heater chip at the tip of the head. The heater chip is a member that generates resistance heat when energized by a pulse heat power supply (not shown).

  The pressing force (Pa) when the heating means pressed the test body was evaluated by a numerical value obtained by dividing the load (N) applied by the head by the cross-sectional area (10 mm × 5 mm) of the main body of the resin molded body.

  In the bonding test, a heat treatment was performed at a predetermined temperature and time after pressing by a heat generating means. As shown in FIG. 3, the temperature history of the test body is increased from a normal temperature 21 to a set temperature 22 so as to have a predetermined heating time 23. After the temperature reaches the set temperature 22, the temperature is held for a predetermined holding time 24. After the elapse of the holding time 24, the air is forcibly air-cooled, and after the temperature substantially reaches the normal temperature 21, the pressing is released. In the heat treatment of the test body, a thermocouple was installed near the joint 9 where the coated metal base material 1 and the resin material 4 were in contact with each other, and the temperature was measured. In the present example, the heating temperature of the specimen was determined based on the measured value. Thermocompression bonding was performed at a predetermined pressure, heating temperature, and heating time to produce a bonded composite, which was subjected to a shear tensile test. Since the resin material is entirely loaded in the opening and is in a state of being restrained by the main body of the heating and pressing jig, the joint between the painted metal base material and the resin material has a structure shown in FIG. The resin deformed portion where the resin flowed out as shown in FIG. Therefore, the joint area of the joint corresponds to the cross-sectional area (10 mm × 5 mm) of the resin material main body.

(Joint strength)
The sheared tensile test is performed on the joined specimens by a tensile tester shown in FIG. 10 in accordance with the international standard of International Standard ISO 19095-2 2015 (Evaluation of adhesion interface performance of plastic-metal assembly-). Was. The tensile speed was set at 5 mm / min, and the peak load at which the test piece broke was determined. The test piece was fixed on the side of the painted metal base material 1 with the upper jig 15 and on the side of the resin material 4 with the lower jig 16. The coated metal base material 1 was fixed so that one end protruded from the upper jig 9, and the protruded one end was gripped by the upper grip 13. The entire resin material 4 was fixed with a lower jig 16, and the lower jig 16 was gripped by a lower grip 14. Thereby, it is possible to prevent the resin material 4 from being crushed by the lower grip portion 8. When attaching the test piece to the tensile test apparatus, the test piece was gripped such that the joint interface of the test piece and the central axis of the lower grip 16 substantially coincided with each other. Since the area of the joint of the specimen corresponds to the contact area between the painted metal base material 1 and the resin material 4, the peak load (N) obtained by a tensile test is joined as an index of the shear joint strength of the specimen. Using the numerical value divided by the area (50 mm ² ), this was taken as the bonding strength (MPa) of the test specimen.

(Test Example 1)
The joining strength of the test pieces joined by the jig for thermocompression bonding according to the present embodiment was examined. Examples 1 and 2 of the present invention were joined by using a jig 31 for pressing and pressing under the conditions of a pressure applied to the test piece of 1 MPa, a temperature rising time of 5 s, a holding time of 5 s, and a heating temperature of 270 ° C. Further, as Reference Examples 1 and 2, test pieces joined under the same conditions using the jig 11 shown in FIG. 4 were produced. Then, the shear joint strength of each joined specimen was measured. Table 1 shows the test results. Two kinds of resins were used for the resin material of the test body. Inventive Example 1 and Reference Example 1 are cases where a polyamide resin (PA6) is used as the resin material, and Inventive Example 2 and Reference Example 2 are cases where polypropylene (PP) is used as the resin material.

  As shown in Table 1, the test pieces joined by the jigs for thermocompression bonding according to the present embodiment (Examples 1 and 2 of the present invention) were compared with the test pieces (Reference Examples 1 and 2) using the jig of the reference example. Thus, the shear bonding strength was higher.

(Test Example 2)
The appearance of the joint obtained by the thermocompression jig according to the present embodiment was examined. Using the test pieces of the present invention example 1 and the reference example 1 made of the resin material of PA6 of test example 1, the appearance of the joint was visually observed. FIG. 11 shows a photograph of the appearance taken.

  As shown in Reference Example 1 of FIG. 11, in the test body using the jig of the reference example, the resin material at the joint is deformed, and the resin flowing out of the resin material body spreads about 1 to 3 mm around and solidifies. Was. In consideration of the design property of the appearance after joining, it is necessary to remove the resin deformed portion that has spread around.

  On the other hand, in the test body using the thermocompression bonding jig according to the present embodiment, as shown in Example 1 of the present invention in FIG. Was held. By using the jig for thermocompression bonding according to the present embodiment, it is possible to ensure good design in the appearance of the joint portion, and to contribute to improvement in manufacturing efficiency in that the operation of removing an extra resin deformed portion can be omitted. I understood that.

(Test Example 3)
Next, using the test piece obtained in Test Example 1, the thickness of the organic resin layer at the bonding interface was measured. After cutting the specimen in the thickness direction near the joint, the cross section was observed with an SEM (scanning electron microscope), and the thickness of three points was arbitrarily measured in the cross section image, and the average value was obtained. . Table 1 shows the results.

  Examples 1 and 2 of the present invention in Table 1 use the jig for thermocompression bonding according to the present embodiment, and Reference Examples 1 and 2 use the jig shown in FIG. As shown in Table 1, the average thickness of the organic resin layer at the joint interface of each of the test materials of Reference Examples 1 and 2 was about more than the film thickness before joining (2 μm) for both PA6 and PP resin materials. It decreased by 35% and was thinner. On the other hand, the average thickness of the organic resin layer in Examples 1 and 2 of the present invention hardly decreased, and the film thickness before joining was almost maintained.

  When the above results are viewed together with the results regarding the appearance of Test Example 2, the joint of the jig of the reference example shows that the deformation of the resin material and the outflow of the resin caused the organic material of the painted metal base material to come into contact with the resin. It is assumed that the resin layer flowed out to the surroundings together with the resin, and that the film became thinner. On the other hand, when the jig of the present invention is used, the resin material is restrained at the time of joining and does not cause deformation of the resin material and outflow of the resin, so that the thickness of the organic resin layer is substantially maintained. It is presumed. And, in the present invention example, it is considered that a high bonding strength was obtained as shown in Test Example 1 because the thinning of the film did not occur after the bonding.

  From the foregoing, the jig for thermocompression bonding according to the present invention provides a composite having a high joining strength in which a metal material and a resin material are joined, and easily manufactures the composite with good working efficiency. A useful effect is obtained in that a method can be provided.

REFERENCE SIGNS LIST 1 painted metal base material 2 metal base material 3 organic resin layer 4 resin material 5 bonded body 6 first surface 7 second surface 8 composite 9 bonding portion 10 heating means 11 positioning jig 12 recess 13 upper side Grasping part 14 Lower gripping part 15 Upper jig 16 Lower jig 17 Resin deformation part 21 Room temperature 22 Set temperature 23 Heating time 24 Holding time 25 Cooling time 30 Heating / compression jig 31 Main part 32 Opening 33 Mounting surface 34 Supporting part 35 Pressing means 36 Supporting means 37 Pressing means 38 Stopper

Claims (5)

A hot-pressing jig for producing a composite by applying heat and pressure to a coated metal material and a resin material having an organic resin layer on at least one surface of the metal material,
A main body having a mounting surface provided with an opening, and a support portion disposed adjacent to the opening,
The main body, the painted metal base material is placed on the mounting surface described above,
The opening, the height of the inner wall surrounding it, is equal to or higher than the height of the resin material,
The thermocompression bonding jig, wherein the support portion includes a pressing unit that presses the resin material loaded in the opening.   The jig for thermocompression bonding according to claim 1, wherein the pressing unit includes a supporting unit that is in contact with the resin material, and a pressing unit that moves the supporting unit.   The jig for heat compression bonding according to claim 1, wherein the pressing unit has a portion that enters the opening.   The composite body of the painted metal base material and the resin material is manufactured by heating and pressing the painted metal base material and the resin material using the jig for thermocompression bonding according to claim 1 or 2. To produce a composite. Superimposing the painted metal preform and the resin material to produce a joined body in which the first surface of the painted metal preform provided with an organic resin layer and the surface of the resin material face each other;
After that, in the object to be joined, a heating means is arranged on a second surface of the painted metal base material located on a side opposite to the first surface;
Next, the heat generating means is pressed against the second surface to bring the coated metal base material and the resin material into close contact with each other, and the heat generating means performs a heat treatment on the object to be bonded, and Joining the metal material and the resin material,
The method for producing a composite according to claim 4, comprising producing a composite of the painted metal base material and the resin material, the composite comprising: