TWI670161B - Composite member manufacturing method and composite member - Google Patents

Abstract

The production method of the present invention is a method of producing a composite member in which a base material and a resin member are joined. The manufacturing method includes a surface treatment step of forming micro-scale or nano-scale irregularities on the surface of the base material, and a bonding step of the resin on the surface of the base material having the unevenness formed by the surface treatment step The members are directly joined by injection molding. Further, the composite member includes a base material having micron-order or nano-scale irregularities on the surface thereof, and a resin member directly contacting the surface of the base material.

Description

Composite member manufacturing method and composite member

One aspect and embodiment of the present invention relates to a method of manufacturing a composite member and a composite member.

Patent Document 1 discloses a method of manufacturing a composite member. In this method, a resin member is directly joined to a metal member by insert molding, whereby a composite molded member in which a metal member and a resin member are composited is produced. The joint surface of the metal member is subjected to surface roughing treatment by physical treatment or chemical treatment. Patent Document 2 similarly discloses a method of manufacturing a composite member. The joint surface of the metal member is subjected to surface roughening treatment by laser processing. In Patent Documents 1 and 2, it is described that the joint strength between the metal member and the resin member is improved by performing surface roughening treatment on the joint surface of the metal member.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2015-016682

Patent Document 2: Japanese Patent Laid-Open Publication No. 2010-167475

However, Patent Documents 1 and 2 do not disclose the influence of the form of the joint surface of the metal member on the joint strength. In the technical field, a method of manufacturing a composite member having excellent joint strength and a composite member having excellent joint strength are desired.

A method for producing a composite member according to an aspect of the present invention is a method for producing a composite member in which a base material and a resin member are joined, comprising: a surface treatment step of forming a micron- or nano-scale bump on the surface of the base material And a bonding step of directly bonding the resin member by injection molding on the surface of the base material having the unevenness formed by the surface treatment step.

In the manufacturing method, irregularities of a micron order or a nanometer order are formed on the surface of the base material directly bonded to the resin member. Hardening by the resin member entering the micro- or nano-scale irregularities produces a stronger anchoring effect compared to the case of millimeter-scale irregularities. Therefore, this manufacturing method can produce a composite member having excellent joint strength.

The arithmetic mean slope of the surface of the base material on which the unevenness is formed in the surface treatment step can be set to 0.17 to 0.50. The arithmetic mean slope means that the measurement curve is divided at a fixed interval in the lateral direction, and the absolute value of the slope (angle) of the line segment connecting the end points of the measurement curves in each section is obtained, and the absolute values of the intervals are averaged. And the winner. Further, the root mean square slope of the surface of the base material on which the unevenness is formed in the surface treatment step can be set to 0.27 to 0.60. The root mean square slope is calculated from the root mean square of the slopes of all points in the defined region. The root mean square slope is obtained by dividing the measurement curve at a fixed interval in the lateral direction, and obtaining an average of the square values of the slopes (angles) of the line segments connecting the end points of the measurement curves in the respective intervals. The square root of the value. Thus, by controlling the parameter indicating how large the slope exists in the narrow space, it is possible to manufacture a composite member having excellent joint strength.

The surface treatment step may be a step of forming irregularities by sandblasting. In this case, the surface structure of the joint surface can be quantitatively controlled compared to other surface treatment methods for joining the members, and surface processing can be performed at low cost and in a short time.

The injection pressure in the sandblasting process can be set to 0.5 to 2.0 MPa. The particle size of the spray material in the sandblasting process can be set to 30 to 300 μm. By the conditions of such blasting, an optimum micron- or nano-scale unevenness can be formed on the surface of the base material.

Further, the material of the base material may be made of metal, glass, ceramic or resin. By base metal The surface is formed with micro-scale or nano-scale irregularities, and even if the material of the base material is any one of metal, glass, ceramic or resin, a composite member having excellent joint strength can be produced.

Another aspect of the composite member of the present invention comprises: a base material having micron-order or nano-scale irregularities on its surface; and a resin member directly contacting the surface of the base material.

Since the composite member directly contacts the micro-scale or nano-scale unevenness of the surface of the base material, the composite member has a stronger anchoring effect as compared with the case of the base material having the unevenness of the millimeter order. Therefore, the composite member has excellent joint strength.

The arithmetic mean slope of the surface of the base metal can be from 0.17 to 0.50. Further, the root mean square slope of the surface of the base material may be 0.27 to 0.60. The composite member has excellent joint strength because it has irregularities that can control the parameter indicating how much slope exists in a narrow space.

The material of the base material may be metal, glass, ceramic or resin. Since the micro-scale or nano-scale irregularities are formed on the surface of the base material, the composite member has excellent joint strength even if the material of the base material is any one of metal, glass, ceramic or resin.

As described above, according to an aspect and an embodiment of the present invention, it is possible to provide a method for producing a composite member having excellent joint strength and a composite member having excellent joint strength.

1‧‧‧Composite components

2‧‧‧Material

2a‧‧‧ Surface of base metal 2

2b‧‧‧ bump

2c‧‧‧ part of the surface 2a of the base material 2

3‧‧‧Resin components

4‧‧‧Contact surface of base metal 2

10‧‧‧Blasting equipment

11‧‧‧Processing room

12‧‧‧ spray nozzle

13‧‧‧ Storage tank

14‧‧‧Pressure room

15‧‧‧Compressed gas supply machine

16‧‧‧Quantitative Supply Department

17‧‧‧Connecting tube

18‧‧‧Processing table

19‧‧‧Control Department

20‧‧‧Mold

21‧‧‧Mold body

21a‧‧‧Upper mold

21b‧‧‧Mold

22‧‧‧ Space

23‧‧‧ Space

24‧‧‧Runner

25‧‧‧Rough

26‧‧‧ gate

27‧‧‧ Pressure Sensor

28‧‧‧Temperature Sensor

30‧‧‧Evaluation device

31‧‧‧Abutment

31a‧‧‧Fixed Department

32‧‧‧ Holding Department

32a‧‧‧Retained surface

32b‧‧‧ Pushing members

33‧‧‧Resin component retention

33a‧‧‧Retained surface

33b‧‧‧ Pushing members

33c‧‧‧ Wheels

34‧‧‧Motor

34a‧‧‧Ball screw

35‧‧‧ load weight

115‧‧‧Compressed gas flow

120‧‧‧Spray tube holder

121‧‧‧Convergence Acceleration Department

122‧‧‧Spray outlet

123‧‧‧Injection material inlet

124‧‧‧Steam tube

L‧‧‧ track

P‧‧‧Transfer spacing

Fig. 1 is a perspective view showing a composite member of an embodiment.

Figure 2 is a cross-sectional view of the composite member taken along line II-II of Figure 1.

Fig. 3 is a conceptual view of a blasting apparatus used in a method of manufacturing a composite member according to an embodiment.

Fig. 4 is a view for explaining a configuration of a blasting apparatus used in a method of manufacturing a composite member according to an embodiment.

Figure 5 is a cross-sectional view of the spray nozzle of Figure 4.

Figure 6 is a plan view of a mold for injection molding.

Figure 7 is a cross-sectional view of the mold taken along the line VII-VII of Figure 6.

Fig. 8 is a flow chart showing a method of manufacturing a composite member according to an embodiment.

Figure 9 is a conceptual diagram of sandblasting.

Fig. 10 is a view for explaining the scanning of the blasting process.

Fig. 11 is a schematic cross-sectional view showing an apparatus for evaluating shear stress.

Hereinafter, embodiments will be described with reference to the drawings. In the following description, the same or similar components are designated by the same reference numerals, and the description thereof will not be repeated. Further, the "joining strength" in the present embodiment will be described in the form of "shear strength".

[composite component]

Fig. 1 is a perspective view showing the composite member 1 of the embodiment. As shown in Fig. 1, the composite member 1 is a member in which a plurality of members are integrated by joining. For example, the composite member 1 is a member that joins a resin member to a dissimilar member with respect to the resin member. The dissimilar member with respect to the resin member means a member formed of a material having properties different from those of the resin member in terms of thermal expansion coefficient, heat transfer coefficient, strength, and the like.

The composite member 1 includes a base material 2 and a resin member 3. The base material 2 is an example of a plate-shaped member. The resin member 3 is in direct contact with the surface of the base material 2. In Fig. 1, the resin member 3 is in direct contact with a portion of the surface of the base material 2 (contact surface 4 of the base material 2) and has an overlapping joint configuration. The material of the base material 2 is metal, glass, ceramic or resin. The material of the resin member 3 is a resin such as polybutylene terephthalate, polyphenylene sulfide, polyamine, liquid crystal polymer, polypropylene, acrylonitrile butadiene styrene.

Figure 2 is a cross-sectional view of the composite member 1 taken along line II-II of Figure 1. As shown in Fig. 2, the base material 2 has a concavity and convexity 2b at a portion (contact surface 4) of its surface 2a. The unevenness 2b is a micron-scale or nano-scale unevenness. The micron-sized unevenness means an unevenness having a height difference of 1 μm or more and less than 1000 μm. The unevenness of the nano-scale means an unevenness having a height difference of 1 nm or more and less than 1000 nm. As a more specific example, one part of the surface 2a (contact surface) In 4), the arithmetic mean roughness Ra, the maximum height Ry, and the ten point average roughness Rz defined in JIS B0601 (1994) can be 0.2 to 5.0 μm, 1.0 to 30.0 μm, and 1.0 to 20.0 μm, respectively. When each of the arithmetic mean roughness Ra, the maximum height Ry, and the ten-point average roughness Rz is within the above range, the unevenness 2b sufficiently exhibits the anchoring effect on the resin member 3. Therefore, the bonding strength between the base material 2 and the resin member 3 becomes high.

Further, when it is found that the arithmetic mean slope RΔa defined in JIS B0601 (1994) is controlled, a higher joint strength can be obtained. As a specific example, the arithmetic mean slope RΔa can be set to 0.17 to 0.50. The smaller the arithmetic mean slope RΔa, the smaller the joint strength. When the arithmetic mean slope RΔa is less than 0.17, it is difficult to obtain a practical joint strength. Further, the larger the arithmetic mean slope RΔa, the higher the processing condition for forming the unevenness 2b. Therefore, when the arithmetic mean slope RΔa is larger than 0.50, there is a possibility that the productivity is lowered. In particular, when such irregularities 2b are formed by sandblasting described below, it is difficult to perform processing so as to have an arithmetic mean slope RΔa exceeding 0.50.

Further, it is found that when the root mean square slope RΔq is controlled in addition to the arithmetic mean slope RΔa, a higher joint strength can be obtained. As a specific example, the root mean square slope RΔq can be set to 0.27 to 0.60. The smaller the root mean square slope RΔq, the smaller the joint strength. When the root mean square slope RΔq is less than 0.27, it is difficult to obtain a practical joint strength. Further, the larger the root mean square slope RΔq, the higher the processing condition for forming the unevenness 2b. Therefore, when the root mean square slope RΔq is larger than 0.60, there is a drop in productivity. In particular, when such irregularities 2b are formed by the following sandblasting, it is difficult to perform processing so as to become a root mean square slope RΔq exceeding 0.60.

The resin member 3 is joined to the base material 2 in a state where a part thereof enters the unevenness 2b. Such a structure is formed by injection molding using the mold 20 described below.

As described above, in the composite member 1 of the present embodiment, since the resin member 3 directly contacts the micron-order or nano-scale unevenness of the surface 2a of the base material 2, it is stronger than the case of the base material having the unevenness of the millimeter order. Anchoring effect. Therefore, the composite member has excellent joints strength.

[Manufacturing method of composite member]

An outline of the apparatus used in the method of manufacturing the composite member 1 will be described. First, an apparatus for performing sandblasting on the surface of the base material 2 will be described. The blasting apparatus can be of any type such as a gravity type (suction type) air injection device, a direct pressure type (pressure type) air injection device, a centrifugal injection device, or the like. As an example, the manufacturing method of this embodiment uses a so-called direct pressure type (pressurized type) air injection device. 3 is a conceptual view of a sandblasting apparatus 10 used in a method of manufacturing the composite member 1. The blasting apparatus 10 includes a processing chamber 11, a spray nozzle 12, a storage tank 13, a pressurizing chamber 14, a compressed gas supply device 15, and a dust collector (not shown).

A spray nozzle 12 is housed inside the processing chamber 11, and a workpiece (here, the base material 2) is sandblasted in the processing chamber 11. The ejection material ejected from the ejection nozzle 12 is dropped together with the dust to the lower portion of the processing chamber 11. The dropped spray material is supplied to the storage tank 13, and the dust is supplied to the dust collector. The dust stored in the storage tank 13 is supplied to the pressurizing chamber 14, and the pressurizing chamber 14 is pressurized by the compressed gas supplier 15. The spray material stored in the pressurizing chamber 14 is supplied to the spray nozzle 12 together with the compressed gas. In this way, the spray material is circulated to face the workpiece for sandblasting.

Fig. 4 is a view for explaining the configuration of the blasting apparatus 10 used in the method of manufacturing the composite member 1 of the embodiment. The blasting apparatus 10 shown in Fig. 4 is a direct injection type ejector shown in Fig. 3. In FIG. 4, a part of the wall surface of the processing chamber 11 is omitted.

As shown in FIG. 4, the blasting apparatus 10 includes a storage tank 13 for injecting materials and a pressurizing chamber 14, which is connected to a compressed gas supply unit 15 and formed in a sealed structure, and a dosing unit 16 which is housed in the pressurizing chamber 14. The nozzle 12 is connected to the storage tank 13 and communicates with the metering unit 16 via a connecting pipe 17; the processing table 18 holds the workpiece below the nozzle 12 and is movable; and the control unit 19.

The control unit 19 controls the constituent elements of the blast processing apparatus 10. As an example, the control unit 19 includes a display unit and a processing unit. The processing department has a CPU (Central Processing Unit, The central processing unit) and the general computer such as the memory unit. The control unit 19 controls the supply amount of each of the compressed gas supply devices 15 that supply compressed gas to the storage tank 13 and the pressurizing chamber 14 based on the set injection pressure and injection speed. Further, the control unit 19 controls the injection position of the injection nozzle 12 based on the distance between the set workpiece and the nozzle, and the scanning conditions (speed, transfer pitch, number of scans, and the like) of the workpiece. As a specific example, the control unit 19 controls the position of the nozzle 12 by using the scanning speed (X direction) and the transfer pitch (Y direction) set before the blast processing. The control unit 19 controls the position of the spray nozzle 12 by moving the processing table 18 holding the workpiece.

Figure 5 is a cross-sectional view of the spray nozzle 12 of Figure 4. The spray nozzle 12 has a spray tube holder 120 as a body portion. The spray pipe holder 120 is a cylindrical member having a space through which the injection material and the compressed gas pass. One end of the spray pipe holder 120 is an injection material introduction port 123, and the other end is an injection material discharge port 122. Inside the injection tube holder 120, an inner wall surface which is tapered toward the tip end of the ejection material ejection opening 122 from the side of the ejection material introduction port 123 is formed, and a convergent acceleration portion 121 having a conical shape having an oblique angle is formed. A cylindrical injection tube 124 is connected to the injection material discharge port 122 side of the injection tube holder 120. The convergence accelerating portion 121 is tapered toward the front end of the injection tube 124 from the middle of the cylindrical portion of the injection tube holder 120. Thereby, a stream of compressed gas 115 is formed.

A connection pipe 17 of the blasting apparatus 10 is connected to the injection material introduction port 123 of the injection nozzle 12. Thereby, the supply material path of the storage tank 13, the quantitative supply part 16, the connection pipe 17, and the injection nozzle 12 in the pressurization chamber 14 is connected in order.

The blasting apparatus 10 configured as described above supplies the supply amount of compressed gas controlled by the control unit 19 from the compressed gas supply unit 15 to the storage tank 13 and the pressurizing chamber 14. Further, the injection material in the storage tank 13 is quantified by the quantitative supply portion 16 in the pressurizing chamber 14 by a fixed pressure, and is supplied to the injection nozzle 12 via the connection pipe 17, and is ejected from the injection pipe of the injection nozzle 12. To the processing surface of the workpiece. Thereby, the fixed spray material is always sprayed onto the machined surface of the workpiece. Further, the injection position of the injection nozzle 12 toward the processing surface of the workpiece is controlled by the control portion 19, The workpiece is sandblasted.

Further, the sprayed material and the cutting powder generated during the sandblasting are sucked by a dust collector (not shown). A classifier (not shown) is disposed in the path from the processing chamber 11 to the dust collector, and is separated into a reusable spray material and other fine powder (a spray material of a size that cannot be reused or a cutting powder produced in the sandblasting process) ). The reusable spray material is accommodated in the storage tank 13 and is again supplied to the spray nozzle 12. The fine powder is recovered by a dust collector.

Next, the injection molding will be described. Injection molding is performed here using insert molding. In the insert molding, an insert is mounted in a specific mold, and the resin is injected and hardened for a specific period of time. Thereafter, the residual stress of the resin is removed by heat treatment. Fig. 6 is a plan view of a mold used for injection molding. Figure 7 is a cross-sectional view of the mold taken along the line VII-VII of Figure 6. As shown in FIGS. 6 and 7, the mold 20 includes a mold body 21 (an upper mold 21a and a lower mold 21b). Between the upper mold 21a and the lower mold 21b, a space 22 for mounting an insert (here, the base material 2) and a space 23 for injecting resin are provided. A resin injection port is provided on the upper surface of the upper mold 21a. The resin injection port communicates with the space 23 via the runner 24, the launder 25, and the gate 26. In the space 23, a pressure sensor 27 and a temperature sensor 28 are provided to detect the pressure and temperature of the space 23. Based on the detection results of the pressure sensor 27 and the temperature sensor 28, the parameters of the molding machine (not shown) are adjusted to produce a molded article. The parameters include the mold temperature, the resin temperature at the time of filling, the filling pressure, the injection rate, the holding time, the pressure at the time of holding, the heat treatment temperature, the heat treatment time, and the like. The molded article formed by the mold 20 is a superposed joint structure in which bonding is performed in a specific area.

Next, a series of processes for manufacturing the composite member 1 will be described. Fig. 8 is a flow chart showing a method of manufacturing the composite member 1 of the embodiment. As shown in FIG. 8, first, a preparation step (S10) is performed to fill a specific blast material to the blast processing apparatus 10. The particle diameter of the ejection material is, for example, 30 to 300 μm. The smaller the particle size, the smaller the mass and thus the lower the inertial force. Therefore, it is difficult to form the unevenness 2b of a desired shape in the case where the particle diameter is less than 30 μm. The more the particle size Larger, the greater the mass, the higher the inertial force. Therefore, it is easy to pulverize the ejection material due to the collision with the base material 2. As a result, (1) the energy of the collision is dispersed to the formation of the unevenness 2b, and the processing efficiency is poor (2) the loss of the injection material is severe, and it is uneconomical. Such a problem becomes remarkable when the particle diameter exceeds 300 μm.

As a preparation step (S10), the control unit 19 of the blast processing apparatus 10 acquires blasting processing conditions. The control unit 19 acquires the blast processing conditions based on the operation of the operon or the information stored in the memory unit. The blasting processing conditions include the injection pressure, the ejection speed, the distance between the nozzles, and the scanning conditions (speed, transfer pitch, number of scans) of the workpiece. The injection pressure is, for example, 0.5 to 2.0 MPa. The smaller the injection pressure, the lower the inertial force. Therefore, it is difficult to form the unevenness 2b of a desired shape when the ejection pressure is less than 0.5 MPa. The greater the injection pressure, the higher the inertial force. Therefore, the ejection material is easily pulverized by the collision with the base material 2. As a result, (1) the energy of the collision is dispersed to the formation of the unevenness 2b, and the processing efficiency is poor (2) the loss of the injection material is severe, and it is uneconomical. Such a problem becomes remarkable when the injection pressure exceeds 2.0 MPa. The control unit 19 precisely controls the size, depth, density, and the like of the unevenness 2b of the surface 2a of the base material 2 in a micron order or a nanometer level by managing the blasting processing conditions. Further, the blasting processing conditions may also include conditions for a specific blasting target area. In this case, selective surface treatment can be performed.

Then, as a sandblasting processing step (S12: surface treatment step), the sandblasting apparatus 10 performs the following series of processes. First, the base material 2 to be subjected to sandblasting is placed on the processing table 18 in the processing chamber 11. Next, the control unit 19 operates a dust collector (not shown). The dust collector pressurizes the inside of the processing chamber 11 based on the control signal of the control unit 19 to be in a negative pressure state. Next, the injection nozzle 12 ejects the injection material in the form of a solid-gas two-phase flow of compressed air in the range of the injection pressure of 0.5 to 2.0 MPa based on the control signal of the control unit 19. Then, the control unit 19 operates the processing table 18 to move the base material 2 into the jet of the solid-gas two-phase flow (below the spray nozzle in Fig. 4). Figure 9 is a conceptual diagram of sandblasting. As shown in Fig. 9, the spray material is ejected from the spray nozzle 12 to a partial region 2c of the surface 2a of the base material 2 material. Here, the control unit 19 causes the processing table 18 to continue to operate to draw a trajectory in which the jet flow is set in advance with respect to the base material 2. Fig. 10 is a view for explaining the scanning of the blasting process. As shown in FIG. 10, the control unit 19 causes the processing table 18 to operate along the locus L that is scanned at the transfer pitch P. Thereby, the desired micro-scale or nano-scale unevenness 2b is formed on the surface of the base material 2.

By using a spray material having a particle diameter of 30 to 300 μm, sandblasting is performed at a spray pressure of 0.5 to 2.0 MPa, and a desired micron- or nano-scale unevenness 2b is formed on the surface 2a of the base material 2 (for example, arithmetic The average slope RΔa and the root mean square slope RΔq are controlled to be concave and convex 2b) of 0.17 to 0.50 and 0.27 to 0.60, respectively. After the operation of the blasting apparatus 10 is stopped, the base material 2 is taken out, thereby completing the blasting process.

Then, as a joining step (S14), a molding machine (not shown) is molded using the above-described mold 20. First, the mold 20 is opened, and the sandblasted base material 2 is attached to the space 22, and the mold 20 is closed. Then, the generator injects the dissolved resin having the set resin temperature into the inside of the mold 20 from the resin injection port. The injected resin is filled in the space 23 via the runner 24, the launder 25, and the gate 26. The generator controls the filling pressure or the injection rate of the resin based on the detection result of the pressure sensor 27. The generator is controlled based on the detection result of the temperature sensor 28 so that the mold temperature becomes a set value. Further, the generator is controlled based on the detection result of the pressure sensor 27 so that the pressure becomes a set value during the set holding time period. Thereafter, the generator performs heat treatment based on the set heat treatment temperature and heat treatment time. Thereafter, the generator molds the mold 20, and takes out the composite member 1 in which the base material 2 and the resin member 3 are integrated. If the joining step (S14) is completed, the flowchart shown in Fig. 8 ends.

As described above, in the manufacturing method of the present embodiment, the unevenness 2b of the micron order or the nanometer order is formed on the surface 2a of the base material 2 directly bonded to the resin member 3. The resin member 3 enters the micro- or nano-scale unevenness 2b and is hardened, whereby a strong anchoring effect is produced compared to the case of the millimeter-scale unevenness. Therefore, the manufacturing method of the present embodiment can be manufactured with Composite member 1 with excellent joint strength.

Further, by the sandblasting, the micro-scale or nano-scale unevenness 2b is formed on the surface 2a of the base material 2, whereby the surface structure of the joint surface can be quantitatively controlled compared to other surface treatment methods for joining the members. Moreover, surface processing can be performed at low cost and in a short time.

For example, as other surface treatment methods, a chemical etching type and a laser processing type are known. The chemical etching type is a method of forming a fine shape on the surface of a metal member by chemical etching, and performing insert molding to bond the metal member and the resin member. This method has a shorter processing time for one-time processing, but must be treated as a wet process. Moreover, this method is difficult to perform quantitative control of the fine shape. The laser processing type is a method in which a metal member is formed into a fine shape on a surface of a metal member by laser processing, and insert molding is performed to bond the metal member and the resin member. The method is a dry process and can perform quantitative control of the fine shape, but the cost of the laser light source is high, and the processing time becomes long. Compared with these methods, the surface treatment method by sandblasting can quantitatively control the surface structure of the joint surface, and can realize low cost and short time.

The present embodiment has been described above, but the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit and scope of the invention.

[Changes in base metal and resin components]

As the base material 2 and the resin member 3 of the above-described embodiment, the plate-shaped member is shown as an example. However, the shape is not limited to the shape, and all shapes that can be in contact with each other can be used. The resin member 3 of the above embodiment is in contact with one of the surfaces of the base material 2, but may be in contact with the entire surface of the base material 2.

[Example of change in injection molding]

The injection molding is not limited to the insert molding, and may be injection molding.

Example

[base metal 2]

The base material 2 used the following materials.

Base material A: Aluminum plate (JIS (Japanese Industrial Standards): A5052)

Base material B: Polyimine plate

[Blasting processing steps]

The surface of the base material 2 is subjected to sandblasting using the blast processing apparatus 10 described in the above embodiment. The spray material is used by mixing an injection material containing alumina and a spray material containing glass. The particle size of the sprayed material is 40 to 250 μm. The spray area density (Coverage) which is a ratio of the total area of the dents by the blasting processing to the total area of the processing area is 50% to 100%, and the particle diameter of the blast material is from 40 to 250 μm. The injection pressure is appropriately selected from the range of 0.5 to 2.0 MPa to perform sandblasting, and the unevenness 2b controlled by Ra, Ry, Rz, RΔa, and RΔq is formed on the surface of the base material 2.

[Joining step]

The resin member 3 is joined to the base material 2 by using the mold 20 described in the above embodiment. The material of the resin member 3 was a polybutylene terephthalate resin (PBT: manufactured by Toray Co., Ltd.: 1101G-X54). At the time of filling, the mold temperature was 140 ° C, the resin temperature was 270 ° C, the filling pressure was 60 MPa, and the injection rate was 64.2 cm ³ /s. At the time of holding, the holding pressure was set to 40 MPa, and the holding time was set to 8 s. At the time of heat treatment, the heat treatment temperature was set to 130 ° C, and the heat treatment time was set to 2 h.

[joint strength evaluation]

The shear strength (shear stress) of the composite member 1 produced under the above conditions was evaluated. The evaluation apparatus used an evaluation apparatus which has a configuration for suppressing the bending generated by the composite member 1 at the time of measurement in order to more accurately measure the shear strength according to ISO 4587 (1995).

Fig. 11 is a schematic cross-sectional view showing the shear strength evaluation device 30. As shown in Figure 11, evaluation The device 30 includes a base 31, a base material holding portion 32 that holds the base material 2, and a resin member holding portion 33 that holds the resin member 3. The base material holding portion 32 and the resin member holding portion 33 are opposed to each other on the base 31.

The base material holding portion 32 holds the base material 2 between the holding surface 32a and the pressing member 32b. Regarding the base material holding portion 32, the bottom portion thereof is fixed to the fixing portion 31a of the base 31. The resin member holding portion 33 holds the resin member 3 between the holding surface 33a and the pressing member 33b. The resin member holding portion 33 has a wheel 33c at its bottom and is movable in the far and near direction with respect to the base material holding portion 32. The resin member holding portion 33 is connected to the ball screw 34a of the motor 34 provided on the base 31, and controls the movement in the near and far directions with respect to the base material holding portion 32. By operating the motor 34, the tensile force acts between the base material 2 and the resin member 3. The tensile force is detected by the load cell 35 disposed between the base 31 and the base material holding portion 32.

The holding surface 33a of the resin member holding portion 33 is formed to be higher than the thickness of the base material 2 as compared with the holding surface 32a of the base material holding portion 32. Thereby, a shearing force can be applied to the joint surface in order to match the acting axis of the tensile force with the joint surface of the base material 2 and the resin member 3. Further, the size of the holding surface 32a of the base material holding portion 32 is larger than that of the base material 2. By supporting the entirety of the base material 2 by the holding surface 32a, the occurrence of bending is suppressed, and the state in which the working axis of the tensile force is aligned with the joint surface can be maintained. The measurement results are shown in Table 1.

In the first embodiment, the parent material A was used, and Ra, Ry, and Rz were controlled so as to be in the range of 0.2 to 5.0 μm, 1.0 to 30.0 μm, and 1.0 to 20.0 μm, respectively, and the shear stress was 6.4 MPa. Although there is a slight lower than the practical shear stress (inferred to be 7 MPa), a practical shear stress can be obtained by more precisely controlling the parameters of the unevenness 2b.

In the examples 2 to 23, the parent material A was used, and an example in which RΔa and RΔq were in the range of 0.17 to 0.50 and 0.20 to 0.60, respectively. It was confirmed that the shear stress was substantially exceeded and the resin was well bonded.

Example 24 is one of the cases where a material other than metal is used as a base material. For example, an example in which the base material B is used is controlled such that RΔa and RΔq are in the range of 0.17 to 0.50 and 0.20 to 0.60, respectively. It was confirmed that the shear stress was substantially exceeded, and even if the base material was a material other than the metal, the resin was well bonded.

[Industrial availability]

The present inventors have found that a composite member having excellent joint strength can be produced by forming micro-scale or nano-scale irregularities on the surface of the base material. This unevenness can be formed by sandblasting or the like. The bonding technology using sandblasting is the only three requirements (the quantitative control of the surface structure, the processing time and the processing cost, and the dry process) required for the direct bonding of the surface-treated different materials. Moreover, since the blasting process can easily form the unevenness, it is advantageous from the viewpoint of environment or economy. Therefore, it is eagerly expected to use the bonding technology of sandblasting to develop direct bonding technology and promote industrial progress.

Claims (9)

A method for producing a composite member, which is a method for producing a composite member obtained by joining a base material and a resin member, comprising: a surface treatment step of forming micro-scale or nano-scale irregularities on a surface of the base material; And a bonding step of directly bonding the resin member to the surface of the base material having the unevenness formed by the surface treatment step by injection molding; and forming the base material having the unevenness in the surface treatment step The arithmetic mean slope of the surface is 0.17~0.50. A method for producing a composite member, which is a method for producing a composite member obtained by joining a base material and a resin member, comprising: a surface treatment step of forming micro-scale or nano-scale irregularities on a surface of the base material; And a bonding step of directly bonding the resin member to the surface of the base material having the unevenness formed by the surface treatment step by injection molding; and forming the base material having the unevenness in the surface treatment step The rms slope of the surface is 0.27~0.60. The method of manufacturing a composite member according to claim 1 or 2, wherein the surface treatment step is a step of forming the unevenness by sandblasting. The method for producing a composite member according to claim 3, wherein the injection pressure in the above blasting process is 0.5 to 2.0 MPa. The method for producing a composite member according to claim 3, wherein the particle diameter of the spray material in the sandblasting process is 30 to 300 μm. The method of producing a composite member according to claim 1 or 2, wherein the material of the base material is metal, glass, ceramic or resin. A composite member comprising: a base material having micron-order or nano-scale irregularities on a surface thereof; and a resin member directly contacting a surface of the base material; and an arithmetic mean slope of a surface of the base material is 0.17 ~0.50. A composite member comprising: a base material having micron-order or nano-scale irregularities on a surface thereof; and a resin member directly contacting a surface of the base material; and a root mean square slope of a surface of the base material is 0.27~0.60. The composite member of claim 7 or 8, wherein the material of the base material is metal, glass, ceramic or resin.