JP2015199248A - Metal-resin composite and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal-resin composite which is composed of a metal member and a resin member fastened integrally and improve further in fastening strength.SOLUTION: A metal-resin composite uses, as the metal member 12, a member formed by roughening the surface 14 of a metal material 20 provided with a plated layer 24 of zinc by heating to a temperature higher than the melting point of zinc to vaporize the zinc, and a resin member 16 is fastened integrally to the surface-roughened surface 14 by insert molding, leading to improvement of the fastening strength of the resin member 16 to the metal member 12. More specifically, owing to the roughness of the surface 14 formed by vaporization of the zinc of the plated layer 24, the irregularity of the surface 14 has a more complex and complicated shape, compared with cases in which the surface is roughened by alloying between zinc of a plated layer 24 and iron of a steel plate 22, and a resultant anchor effect allows the resin part 16 to be fastened with higher fastening strength.

Description

  The present invention relates to a metal-resin composite in which a resin member is integrally fixed to a metal member, and particularly relates to a technique for improving the fixing strength of both.

  A metal resin composite in which a resin member is integrally fixed to a metal member is known. The component described in Patent Document 1 is an example thereof, and the metal member is provided with a metal plating layer such as zinc on the surface of the base metal, and is heated under heating conditions that do not melt the plating layer. The metal of the plating layer is alloyed with the base metal to roughen the surface. Then, by integrally molding the resin member on the roughened metal member, the resin member is integrated with the metal member at the same time as molding due to the anchor effect that part of the resin member enters the irregularities on the surface of the metal member. It comes to be fixed.

JP 2012-116126 A

  However, such a roughening method by alloying causes unevenness on the surface due to the difference in diffusion rate during alloying, and therefore the unevenness of the unevenness is relatively simple and the bond strength that is always sufficient can be satisfied. However, there was still room for improvement.

  The present invention has been made in the background of the above circumstances, and its object is to further improve the fixing strength in a metal resin composite in which a resin member is integrally fixed to a metal member. is there.

  In order to achieve such an object, the first invention is such that the resin member is integrally fixed to the metal member in a state where a part of the resin member enters the irregularities on the surface of the roughened metal member. The metal member is a metal resin composite, wherein the metal member is heated to a temperature higher than a melting point of the metal of the plating layer, wherein a metal plating layer containing zinc is provided on the surface of the base metal. By evaporating the metal of the plating layer, the surface is roughened.

  According to a second aspect of the present invention, there is provided a method for producing a metal-resin composite in which a resin member is integrally fixed to the metal member in a state in which a part of the resin member enters the irregularities on the surface of the roughened metal member. (A) by heating a metal material provided with a metal plating layer containing zinc on the surface of the base metal to a temperature higher than the melting point of the metal of the plating layer, the metal of the plating layer A heat treatment step of evaporating the surface to roughen the surface, and (b) using the metal material subjected to the heat treatment as the metal member, the resin member is integrally fixed to the surface of the metal member. And a resin molding step of integrally molding the resin member.

According to a third invention, in the method for producing a metal resin composite according to the second invention, the heat treatment step (a) raises the temperature of the metal material at a temperature rise rate exceeding 10 ° C./min from 400 ° C. to 600 ° C. And a heating step for heating to 600 ° C. or higher, which is higher than the melting point of the metal of the plating layer, and (b) a high-temperature holding step for holding the metal material in a heated state of 600 ° C. or higher following the heating step, It is characterized by having.
The above temperature is the temperature of the surface of the metal material.

4th invention is the manufacturing method of the metal resin composite of 2nd invention or 3rd invention, (a) The said plating layer is adhered to the surface of the said base metal with the adhesion amount exceeding 20 g / m < ² >, (b) The heat treatment step is performed in a non-oxidizing atmosphere and under a reduced pressure of 20 kPa or less.

  5th invention is the manufacturing method of the metal resin composite material in any one of 2nd invention-4th invention, (a) The said resin member is a fiber reinforced resin which mixed the reinforced fiber in the thermoplastic resin, (b ) In the resin molding step, the metal member is placed in a mold and the fiber reinforced resin is injection-molded in the mold so that the resin member is molded and at the same time is integrally fixed to the surface of the metal member. It is characterized by making it.

  A sixth invention is a method for producing a metal resin composite according to any one of the second to fifth inventions, wherein the metal material is a hot-dip galvanized steel sheet, and is press-formed into a predetermined shape prior to the heat treatment step. It is characterized by that.

  In the metal resin composite of the first invention, the metal material provided with the metal plating layer containing zinc is heated to a temperature higher than the melting point of the metal to evaporate the metal and roughen the surface. Since the resin member is used as a metal member and the resin member is fixed to the roughened surface, the fixing strength of the resin member to the metal member is improved. That is, the surface is roughened by evaporating the metal containing zinc, so compared to the case of roughening due to the variation in diffusion rate when the metal of the plating layer is alloyed with the base metal. The surface irregularities are complicated and more complicated, and the resin member can be fixed with a higher fixing strength due to the anchor effect.

  2nd invention is related with the manufacturing method of the metal resin composite of 1st invention, After evaporating the metal of a plating layer in a heat treatment process and roughening the surface, it is the surface roughened by the resin molding process. Since the resin member is integrally formed so that the resin member is integrally fixed, substantially the same effect as the first invention can be obtained.

  In the third invention, the metal material is heated to a temperature of at least 400 ° C. to 600 ° C. at a rate of temperature exceeding 10 ° C./min and heated to 600 ° C. or higher, and kept in the heated state of 600 ° C. or higher. Since the metal is evaporated, the surface can be appropriately roughened by the evaporation. That is, when the rate of temperature increase is 10 ° C./min or less, the base metal and the metal of the plating layer are alloyed at a higher rate, and the metal evaporated from the plating layer is reduced to roughen the surface by evaporation. The effect of can not be obtained sufficiently. This is thought to be because if the rate of temperature rise is slow, the temperature of not only the surface of the metal material but also the temperature of the internal base metal becomes high, so that the base metal and the metal of the plating layer come to alloy. .

In the 4th invention, since the adhesion amount of a plating layer exceeds 20 g / m < ² >, the roughening by evaporation of the metal of the plating layer can be performed appropriately, and the fixing strength of a resin member is improved appropriately. be able to. This is presumably because the presence of the plating layer hinders the temperature rise of the base metal and suppresses alloying. In addition, since the heat treatment is performed in a non-oxidizing atmosphere and under a reduced pressure of 20 kPa or less, the oxidation of the metal in the plating layer is suppressed, and the surface can be appropriately roughened by the evaporation of the metal in the plating layer. . When the heat treatment is performed under reduced pressure, the melting point is lowered, so that the surface of the plating layer can be appropriately roughened by controlling the evaporation of the metal in the plating layer at a relatively low temperature.

  In the fifth invention, a fiber reinforced resin is used as the resin member, and is integrally formed with the metal member by injection molding and is integrally fixed at the same time as the molding. Therefore, a metal resin composite having a predetermined fixing strength can be easily obtained. And it can be manufactured at low cost.

  In the sixth aspect of the invention, the metal material is a hot dip galvanized steel sheet, and heat treatment is performed after press molding into a predetermined shape in advance, so that heat treatment can be performed without considering the press formability and surface change due to press molding, It is possible to produce a metal resin composite having a high adhesion strength by roughening the surface without unevenness at a low cost.

It is a cross-sectional schematic diagram of the adhering part of the metal resin composite which is one Example of this invention. It is a figure explaining the manufacturing process of the metal resin composite of FIG. 1, and is the figure which compared and showed the cross-sectional schematic diagram of each process. It is a cross-sectional photograph of the surface vicinity of the hot dip galvanized steel plate which is a raw material of the metal member which comprises the metal resin composite of FIG. It is a figure which shows an example of the temperature profile at the time of the heat processing which roughens the hot dip galvanized steel plate of FIG. 5 is a cross-sectional photograph of the vicinity of the surface of a metal member whose surface is roughened by the heat treatment of FIG. 4. It is a surface photograph of the metal member of FIG. It is the figure which compared and showed the cross-section photograph of the surface vicinity roughened by evaporation and alloying. It is a figure explaining seven types of test goods used by the adhesion strength test. It is a perspective view explaining the joining state of the test article of FIG. It is a figure explaining the test method of the adhesion strength test of FIG. It is the figure which showed the test result of the bond strength test of seven types of test products of FIG. FIG. 9 is a cross-sectional photograph of a boundary portion between a metal member and a resin member of test product No. 2 in FIG. 8. It is a cross-sectional photograph of the boundary part between the metal member and the resin member of the test article No1 in FIG.

The present invention is suitably applied to various electrical parts that are molded by embedding or laminating a metal in a synthetic resin material by, for example, injection molding or press molding, for example, a power supply device, an electrode, a connection terminal, etc. The present invention can also be applied to metal resin composites other than electric parts. As a metal material provided with a metal plating layer containing zinc, a hot dip galvanized steel plate or an alloyed hot dip galvanized steel plate is preferably used. In addition to pure zinc or Fe—Zn alloy, Sb, Mg, Si, A plating layer to which an element such as Ni or Al is added in a trace amount may be used. The adhesion amount of the plating layer is desirably over 20 g / m ^2, and more preferably 40 g / m ² or more for appropriately roughening by evaporation while suppressing alloying. Further, considering the processing time for roughening by evaporation and alloying, about 80 g / m ² or less is appropriate.

  As the resin material of the resin member, a thermoplastic resin such as PP (polypropylene), PA6 (polyamide), PPS (polyphenylene sulfide), or the like is suitable, but a thermosetting resin that is solidified from a liquid can also be used. It is also possible to use a fiber reinforced resin in which a reinforced fiber such as glass fiber or carbon fiber is mixed in these resins.

  In the heating process of the third invention, in order to evaporate the plating metal while suppressing alloying, the temperature is increased at a rate of temperature exceeding 10 ° C./min from 400 ° C. to 600 ° C., but 15 ° C./min or more. It is desirable to raise the temperature at a rate of temperature increase. The holding temperature in the high temperature holding step is suitably in the range of, for example, about 600 ° C. to 900 ° C., and the holding time depends on the amount of plating layer deposited so that substantially all of the metal in the plating layer can be evaporated, for example. As appropriate. The holding temperature may be a substantially constant temperature of 600 ° C. or higher, but may be continuously changed. Since the melting point changes depending on the atmospheric pressure during the heat treatment, the heating temperature for evaporation is appropriately determined in consideration of the pressure (atmospheric pressure) in the heat treatment furnace, and alloying is suppressed by heat treatment at 600 ° C. or lower. The plating metal can also be evaporated. After the heat treatment, it is cooled by, for example, natural cooling at room temperature.

  The heat treatment is preferably performed in a non-oxidizing atmosphere and under a reduced pressure of 20 kPa or less. However, the heat treatment may be performed in a reduced-pressure air atmosphere or an atmospheric non-oxidizing atmosphere. The non-oxidizing atmosphere may be a reducing atmosphere, such as a nitrogen gas atmosphere, an argon gas atmosphere, or a carbon monoxide gas atmosphere.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of a metal resin composite 10 according to one embodiment of the present invention, in which a resin member 16 is integrally fixed to a surface 14 of a metal member 12 by insert molding. FIG. 2 is a diagram for explaining the manufacturing process of the metal resin composite 10, and is a diagram showing comparison of cross-sectional schematic diagrams of each process. FIG. 2A is a diagram of the metal material 20 that is a material of the metal member 12. It is sectional drawing. The metal material 20 is a hot-dip galvanized steel sheet in which a pure zinc plating layer 24 is provided on a steel sheet 22 which is a base metal in this embodiment, and is a press-molded product that has been press-molded into a target shape in advance. FIG. 3 is a cross-sectional photograph of the vicinity of the surface of the metal material 20, and the amount of adhesion of the pure zinc plating layer 24 (the amount of adhesion on one side) is more than 20 g / m ² , for example, 40 g / m ^{2 to} 80 g / m ^2. In this embodiment, it is about 60 g / m ² , and the average thickness of the plating layer 24 is about 6 to 8.5 μm.

  The metal material 20 is subjected to the roughening heat treatment shown in FIG. 2 (b), and is heated to, for example, about 600 ° C. to 900 ° C., which is higher than the melting point of zinc, which is the plating metal. By evaporating, the metal member 12 having a roughened surface 14 is obtained. The step (b) is a heat treatment step for roughening the surface of the plating layer 24 by evaporating zinc, and is performed in a heat treatment furnace in a nitrogen gas atmosphere in a vacuum state of, for example, about 10 kPa. FIG. 4 is an example of a temperature profile of the surface temperature of the metal material 20 in this heat treatment step. In this embodiment, the surface is roughened by heating to about 700 ° C. In FIG. 4, the period up to time t3 is the heating process, the period from time t3 to t4 is the high temperature holding process, the period after time t4 is the cooling process, and in the heating process at heating time t1 to t2 where the temperature is raised from 400 ° C. to 600 ° C. Heating is performed so as to increase the temperature at a temperature increase rate exceeding ° C / min. In this embodiment, heating is performed up to 600 ° C. so that the temperature is raised at a temperature raising rate of about 20 ° C./min. Since the rate of temperature rise exceeds 10 ° C./min, alloying of iron of the steel plate 22 and zinc of the plating layer 24 is suppressed due to a delay in temperature rise of the internal steel plate 22, and evaporation of zinc in the plating layer 24 is suppressed. The reaction takes place preferentially. In the high temperature holding process from time t3 to t4, the zinc of the plating layer 24 is further evaporated by the high temperature, and the surface 14 is roughened. Even in this high temperature holding process, evaporation proceeds predominantly. The holding time (t3 to t4) in this high temperature holding step is appropriately determined according to the amount of adhesion of the plating layer 24 so that the zinc of the plating layer 24 is almost completely evaporated, and is about 2 minutes in this embodiment. . After that, it is taken out from the heat treatment furnace and naturally cooled at room temperature, for example.

  FIG. 5 is a cross-sectional photograph of the vicinity of the surface of the metal member 12 whose surface 14 has been roughened by the heat treatment, and FIG. 6 is a surface photograph viewed from a direction perpendicular to the surface 14. It can be seen that has a complicated and intricate uneven shape. FIG. 7 is a cross-sectional view of the vicinity of the surface of the product of the present invention roughened by evaporation and the conventional product roughened by alloying. The product of the present invention is more complicated in unevenness. It is complicated, and a higher anchor effect can be expected when the resin member 16 is integrally formed. On the other hand, when elemental analysis was performed in the vicinity of the surface of the product of the present invention in this case, almost no zinc was observed, and the main component including the complex uneven shape was iron. It is considered that the surface of 22 was altered.

  Returning to FIG. 2, the metal member 12 with the roughened surface 14 obtained by the roughening heat treatment is then subjected to resin molding by resin molding of the resin member 16 as shown in (c). It is integrated with the member 16. The resin member 16 is, for example, a thermoplastic resin such as PPS or PA6, and is a fiber reinforced resin mixed with glass fibers (GF). Then, the metal member 12 is set in the mold of the injection molding apparatus, and the fiber reinforced resin is injected into the mold to be molded, so that the resin member 16 is molded and at the same time integrated with the surface 14 of the metal member 12. Fixed. Since the surface 14 is roughened by the evaporation of zinc in the plating layer 24, the resin material 16 enters the complex uneven shape and solidifies, so that the resin member 16 is fixed integrally with a high fixing strength by the anchor effect. Is done. This insert molding (c) is a resin molding process.

  In such a metal resin composite 10 of this embodiment, the surface of the metal material 20 provided with the zinc plating layer 24 is heated by heating to a temperature higher than the melting point of the zinc, thereby evaporating the zinc. 14 is used as the metal member 12, and the resin member 16 is integrally fixed to the roughened surface 14 by insert molding, so that the resin member 16 is fixed to the metal member 12. Strength is improved. That is, since the surface 14 is roughened by evaporating the zinc of the plating layer 24, the surface of the plating layer 24 is roughened due to variations in diffusion rate when the zinc of the plating layer 24 and the iron of the steel plate 22 are alloyed. Compared to the case, the unevenness of the surface 14 becomes complicated and more complicated, and the resin member 16 can be fixed with a higher fixing strength by the anchor effect.

  Further, the metal material 20 is heated up to about 700 ° C. at a rate of temperature increase of about 20 ° C./min up to 600 ° C. and is heated to about 700 ° C., and kept in the heated state at about 700 ° C. to evaporate zinc in the plating layer 24. Therefore, the surface 14 of the metal member 12 can be appropriately roughened. That is, when the heating rate is 10 ° C./min or less, the ratio of alloying of the iron of the steel plate 22 and the zinc of the plating layer 24 increases, and the amount of zinc evaporated from the plating layer 24 decreases, resulting in evaporation. The effect of roughening cannot be obtained sufficiently. This is because if the rate of temperature rise is slow, not only the surface of the metal material 20 but also the temperature of the internal steel plate 22 becomes high, so that iron of the steel plate 22 and zinc of the plating layer 24 are alloyed. Conceivable.

Moreover, since the adhesion amount of the plating layer 24 is about 60 g / m ² , the surface of the plating layer 24 can be appropriately roughened by evaporation of zinc, and the fixing strength of the resin member 16 can be appropriately improved. Can do. This is presumably because the presence of the plating layer 24 hinders the temperature rise of the internal steel plate 22 and suppresses alloying.

  Further, since the roughening heat treatment is performed in a non-oxidizing nitrogen gas atmosphere and in a vacuum state of about 10 kPa, oxidation of zinc in the plating layer 24 is suppressed, and the surface 14 is formed by evaporation of zinc in the plating layer 24. It can be appropriately roughened. Since the melting point is lowered by performing the heat treatment in a vacuum state, the surface 14 can be appropriately roughened by controlling the evaporation of zinc in the plating layer 24 at a relatively low temperature.

  Further, a fiber reinforced resin is used as the resin member 16 and is integrally formed with the metal member 12 by injection molding and is integrally fixed to the metal member 12 at the same time as the molding, so that the metal resin composite having a predetermined fixing strength. 10 can be manufactured easily and inexpensively.

  In addition, since the metal material 20 is a hot-dip galvanized steel plate and is subjected to a surface roughening heat treatment after being previously press-formed into a predetermined shape, the heat treatment can be performed without considering press formability and surface changes due to press forming. The metal resin composite 10 having a high fixing strength can be produced at low cost by roughening the surface 14 without unevenness.

For example, seven types of test products No1 to No7 shown in FIG. 8 were prepared, and the adhesion strength (bonding strength) was examined by the test method shown in FIGS. 9 and 10, and the result shown in FIG. 11 was obtained. The metal material 20 of the metal member 12 in the test products No1 to No7 is a hot dip galvanized steel plate, an alloyed hot dip galvanized steel plate, or an electrogalvanized steel plate, as shown in the column “Plating type of steel plate”. “Amount” is 60 g / m ² for hot-dip galvanized steel sheets and galvannealed steel sheets and 20 g / m ² for electrogalvanized steel sheets. The atmosphere in the furnace when the metal material 20 is subjected to the roughening heat treatment is an air atmosphere or a nitrogen gas atmosphere, the atmospheric pressure is atmospheric pressure (100 kPa) or vacuum (10 kPa), and the heating rate up to 600 ° C. in the heating process is 20 ° C. / Min or 10 ° C./min, the holding temperature in the high temperature holding step is 900 ° C. or 700 ° C., and the holding time (t3 to t4) is 4 minutes or 2 minutes. On the other hand, the material of the resin member 16 is glass fiber reinforced PPS resin (PPS-GF), glass fiber reinforced PA6 resin (PA6-GF), or glass fiber reinforced PP resin (PP-GF). Both are 40% by weight.

Then, as shown in FIG. 9, each test article TP is formed by insert molding the resin member 16 so that the rectangular plate-like metal member 12 and the resin member 16 are partially overlapped and fixed integrally. Was made. The width dimension W of the fixing portion is 20 mm, the overlapping dimension L is 15 mm, and the fixing area is 20 × 15 = 300 mm ² . The plate thickness of the metal member 12 is 2 mm, and the plate thickness of the resin member 16 is 2.3 mm. FIG. 10 shows a tensile test apparatus 30 having a pair of clamps 32, 34 in which the metal member 12 is gripped by one clamp 32 and the resin member 16 is locked to a jig 36 gripped by the other clamp 34. Then, the clamps 32 and 34 were pulled away from each other, and the maximum tensile load (shear load) was measured as the fixing strength. The tensile speed is 5 mm / min, and the test atmosphere is a temperature of 23 ° C. and a humidity of 50%.

In the test results of FIG. 11, “◯” in the “determination” column is acceptable, and “x” is unacceptable, and the determination is based on whether or not it is 1000 N or more. As is apparent from the results of the test products No. 6 and No. 7 in FIG. 11, the metal material 20 is a hot dip galvanized steel sheet, the plating adhesion amount is 60 g / m ² , and the furnace atmosphere during the roughening heat treatment is a nitrogen gas atmosphere When the pressure is vacuum, the heating rate of the heating process is 20 ° C./min, the holding temperature of the high temperature holding process is 700 ° C., and the holding time (t3 to t4) is 2 minutes, the resin member 16 is reinforced with glass fiber Whether it is PA6 resin (PA6-GF) or glass fiber reinforced PP resin (PP-GF), it does not peel off at the fixing interface, and a high fixing strength of 3500 N or more at which the resin member 16 breaks is obtained. It was. In particular, when the resin member 16 is a test article No. 6 made of glass fiber reinforced PA6 resin, a very high fixing strength of 5000 N or more is obtained. The metal resin composite 10 of the above example is the same as the test product No 6, and the photographs in FIGS. 5 to 7 relate to the test product No 6.

  In the case of the test product No. 2 in which the atmospheric pressure during the roughening heat treatment is different from that of the test product No. 6 in the test product No. 2, although peeled at the fixing interface, a fixing strength of 2000 N or more was obtained. The cross-sectional photograph of FIG. 12 relates to this test product No. 2, and the surface 14 of the steel plate 22 (metal member 12), which is the base metal, has complex and intricate irregularities formed in the state of biting into the irregularities. The resin member 16 is integrally formed. As a result of elemental analysis, iron and oxygen are detected in the concavo-convex portion, which is considered to be iron oxide. On the uneven portion, an oxide layer of zinc and oxygen is partially formed with a slight gap therebetween, and the resin of the resin member 16 also fills the gap between the uneven portion and the oxide layer. It was.

  In the test product No. 3 in which the metal material 20 is an alloyed hot-dip galvanized steel sheet as compared with the test product No. 2 above, the plating layer 24 is an Fe—Zn alloy and the zinc evaporation is inhibited, but 1300 N A degree of fixing strength was obtained. It is considered that this is because the ratio of zinc increases near the surface of the plating layer 24 and roughens to some extent by evaporation.

  On the other hand, when the atmosphere in the furnace at the time of the roughening heat treatment is air and the test article No. 1 has an atmospheric pressure, an oxide film is formed on the surface of the plating layer 24, and the evaporation of zinc is hindered. It is alloyed with iron of the steel plate 22 which is a base metal, and sufficient fixing strength cannot be obtained. The cross-sectional photograph of FIG. 13 relates to this test sample No1, and according to elemental analysis, a layer of zinc oxide (ZnO) or iron oxide (FeO) is recognized at the boundary with the resin member 16, and Fe underneath is observed. An alloy layer of -Zn is formed.

When the metal material 20 is an electrogalvanized steel plate and the test specimen No. 4 has a coating amount of 20 g / m ² , the amount of zinc is small, so that roughening by evaporation is not performed sufficiently, and the metal member 12 and resin are not formed in insert molding. Adherence to the member 16 itself was impossible. Further, in the test product No. 5 in which the heating rate in the heating process is 10 ° C./min as compared with the test product No. 2, since the heating rate is slow, the zinc of the plating layer 24 is alloyed with the iron of the steel plate 22. Therefore, the amount of zinc is increased and the evaporation of zinc is reduced accordingly, roughening is hindered, and sufficient fixing strength cannot be obtained.

From this test result, the plating amount of the metal material 20 exceeds 20 g / m ² and is preferably 40 g / m ² or more, and the furnace atmosphere during the roughening heat treatment is preferably a non-oxidizing atmosphere such as nitrogen gas, The rate of temperature increase during the heating step exceeds 10 ° C./min and is preferably 15 ° C./min or more. Further, the metal material 20 may be a hot dip galvanized steel sheet or an alloyed hot dip galvanized steel sheet, but the plated layer 24 is preferably a hot dip galvanized steel sheet of pure zinc, and the atmospheric pressure during the roughening heat treatment is atmospheric pressure. However, vacuum may be used, but a reduced pressure state of 20 kPa or less is desirable.

  As mentioned above, although the Example of this invention was described in detail based on drawing, these are one Embodiment to the last, This invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

  10: Metal resin composite 12: Metal member 14: Surface 16: Resin member 20: Metal material 22: Steel plate (base metal) 24: Plating layer

Claims (6)

A metal resin composite in which the resin member is integrally fixed to the metal member in a state in which a part of the resin member enters the irregularities on the surface of the roughened metal member,
The metal member evaporates the metal of the plating layer by heating a metal material having a metal plating layer containing zinc on the surface of the base metal to a temperature higher than the melting point of the metal of the plating layer. A metal resin composite characterized in that the surface is roughened. A method for producing a metal-resin composite in which the resin member is integrally fixed to the metal member in a state in which a part of the resin member enters the irregularities on the surface of the roughened metal member,
By heating a metal material having a metal plating layer containing zinc on the surface of the base metal to a temperature higher than the melting point of the metal of the plating layer, the metal of the plating layer is evaporated to roughen the surface. Heat treatment process to surface,
A resin molding step of integrally molding the resin member using the metal material subjected to the heat treatment as the metal member, so that the resin member is integrally fixed to the surface of the metal member;
The manufacturing method of the metal resin composite characterized by having. The heat treatment step includes
A heating step of heating the metal material to a temperature of at least 400 ° C. to 600 ° C. at a rate of temperature exceeding 10 ° C./min and heating to 600 ° C. or higher, which is higher than the melting point of the metal of the plating layer;
Following the heating step, a high temperature holding step for holding the metal material in a heated state of 600 ° C. or higher;
The method for producing a metal resin composite according to claim 2, comprising: The plating layer is adhered to the surface of the base metal with an adhesion amount exceeding 20 g / m ² ;
The method for producing a metal resin composite according to claim 2 or 3, wherein the heat treatment step is performed in a non-oxidizing atmosphere and in a reduced pressure state of 20 kPa or less. The resin member is a fiber reinforced resin in which a reinforced fiber is mixed in a thermoplastic resin,
In the resin molding step, the metal member is placed in a mold and the fiber reinforced resin is injection-molded in the mold, so that the resin member is molded and simultaneously fixed to the surface of the metal member. The method for producing a metal resin composite according to any one of claims 2 to 4, wherein: The method for producing a metal-resin composite according to any one of claims 2 to 5, wherein the metal material is a hot-dip galvanized steel sheet and is press-formed into a predetermined shape in advance prior to the heat treatment step. .