KR101389989B1 - Metallic alloy-resin composite and method of producing the same - Google Patents

Abstract

The present invention relates to an integrated metal-resin composite structure of different materials and a method of manufacturing the same, wherein a structure of a metal alloy covered with a fine groove portion and a protrusion is inserted into a molding die, and the resin composition is injected into the molding die, The present invention provides an integrated metal-resin composite structure of different materials that can be strongly held. INDUSTRIAL APPLICABILITY The integrated composite structure of the present invention and its manufacturing method can improve the reliability by providing simplification of the manufacturing process, low management standard, generalized low cost chemicals, and further improved tensile force, It is possible to use an inexpensive resin material while improving the use restriction problem, thereby increasing the possibility of utilization in an industrial field.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal-resin composite structure used in cases of electronic equipment and household appliances, structural parts, machine parts, and the like, and more particularly to a metal alloy composite structure A heterogeneous material that can provide a lightweight composite structure for use in electronic devices, household appliances, medical devices, structural parts for vehicles, vehicles, building materials, airtight commercial parts, pressure vessels and other structural parts and exterior parts And a method of manufacturing the same.

The technique of integrating the metallic alloy material of different materials and the resin material with the adhesive is required from a wide range of industrial and technical fields such as automobiles, home electronic products, and industrial devices. Therefore, many adhesives, adhesive tapes, And plastic jointing mold technology have been developed.

In this case, among the developed adhesives, there is also one which exhibits excellent adhesion performance. Such adhesives are used for joining together a metal composite material and a resin material while exhibiting an adhesive function at room temperature or by heating. , TVs, mobile phones, and laptops.

Meanwhile, conventionally, methods of joining a metal alloy material and a resin material, which are different materials, without using an adhesive, have been studied. As one of them, a nano method is actively researched.

That is, the bonding technique of the different materials by the nano method is to make a nano-sized groove on the surface of the metal alloy material and insert the resin material.

However, while the above-mentioned insert technology has advantages of higher tensile strength than adhesive, it has a strict management standard for material selection, complicated treatment, high unit cost, and high waste chemicals, .

That is, the conventional nano-based insert technology has to insert a resin material into a nano-sized hole. In this case, in order to improve the penetration performance of the resin material, it is necessary to use only a specific resin material.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide a method of manufacturing a metal mold, in which a structure of a metal alloy covered with fine grooves and protrusions is injected into a molding die, It is an object of the present invention to provide an integrated metal-resin composite structure of different materials.

Another object of the present invention is to improve the reliability by providing a simplified manufacturing process, a lower management standard, a generalized low cost drug, and an improved tensile force, and improve the reliability of the resin material caused by the conventional nano- The present invention also provides an integrated composite structure of different materials and a method of manufacturing the same.

To accomplish the above object, the present invention provides a monolithic integrated metal-resin composite structure made of a heterogeneous material, characterized in that the metal is subjected to a process of nicking the metal with at least one aqueous solution selected from sodium hydroxide, potassium hydroxide and magnesium hydroxide compound, A metal alloy portion having a groove portion with a protrusion undercut of 1 to 30 占 퐉 and a resin material having the surface of the metal alloy portion fixed by injection molding.

The method for fabricating the metal composite structure may include cleaning the metal surface and dipping the oxide film on the metal surface by immersing the oxide film in an aqueous hydrochloric acid solution; Forming a metal alloy portion having a groove portion and a protruding portion undercut having an average length of a straight length of 1 to 30 占 퐉 by nicking the metal with at least one aqueous solution selected from sodium hydroxide, potassium hydroxide and magnesium hydroxide compound; And a step of injection-bonding the resin material to the surface of the metal alloy part after the metal alloy part subjected to the nicking process is injected into the injection-molding mold.

The metal alloy part is an aluminum alloy, and the resin material is resins sold and sold in the general industry such as PC, PPS, PPA, PBT, PA6, PA66, and PP which are distributed and sold on the market

It is preferable that the aluminum alloy is an alloy of non-heat treatment type which increases hardness and tensile strength only by hardening after machining, a heat-treated alloy which improves mechanical properties by heat treatment, and aluminum die casting which is a metal injection method.

As described above, according to the present invention, a structure of a metal alloy covered with a fine groove portion and a protruding portion is injected into an injection molding metal mold, and then a resin composition is injection-injected into the injection molding metal mold. Through this, a metal alloy material and a resin material, Thereby enabling to maintain a strong bonding state, to simplify the manufacturing process, to provide low management standards, generalized low cost chemicals, improved tensile strength, and improved reliability.

In addition, the present invention can be expected to have an advantage in that it can be used in various industrial fields by making it possible to use various resin materials at low cost while improving the restriction problem of the resin material occurring when using the bonding technique by the conventional nano method.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an embodiment of the present invention in which a metal alloy part, an aluminum alloy, and a resin are bonded. Fig.
FIG. 2 is an enlarged view of an embodiment of the present invention, which is coated with platinum so that the aluminum surface can be seen clearly, and then observed at an magnification of 3,000 through an electron microscope.
FIG. 3 is an enlarged view of an embodiment of the present invention, in which an aluminum surface is coated with platinum so as to be clearly visible, and then observed through an electron microscope at five hundred magnifications
FIG. 4 is an enlarged photograph of an embodiment of the present invention, in which an aluminum surface is coated with platinum so as to be clearly visible and then observed at an electron microscope at a magnification of 5 ×.

Hereinafter, preferred embodiments of the present invention will be described more specifically with reference to the accompanying drawings.

[Metal alloy part]

The metal alloy part used in the present invention is an aluminum alloy produced by machining. Such an aluminum alloy is a non-heat-treated alloy which increases hardness and tensile strength only by hardening after machining, and a heat-treatment alloy which improves mechanical properties by heat treatment , Or injection molding die casting.

The aluminum alloy belonging to the non-heat-treated alloy may be an Al-Mg alloy, an Al-Mn alloy, an Al-Mg-Mn alloy, Alloys, Al-Zn-Mg alloys, Al-Mg-Si alloys, and heat resistant aluminum alloys.

As described above, various kinds of aluminum alloys to be applied to the embodiment of the present invention are known, and they are standardized as A1000 to A7000 series of Korean Industrial Standards (KDS).

The aluminum alloy to be applied to the embodiment of the present invention is obtained from an intermediate aluminum material such as a plate shape, a rod shape, and a pipe-shaped extrusion material before machining, and it can be processed by cutting, cutting, drawing, machining such as milling, discharge machining, press machining, grinding machining, and grinding machining.

Therefore, the part structure is processed into parts having a shape and structure necessary for a specific product while being injected into an injection molding metal mold.

The aluminum alloy component processed as described above must not have a thick oxide film, an oxide film, or the like to be adhered to the surface, and the presence of rust on the surface due to long-term natural standing may be caused by polishing, It is necessary to perform processing such as machining to remove the surface. However, if it is not severe, it is not a problem since it is mostly removed when removing the film. The dirt other than rust, that is, the oil layer on the surface attached in the metal working process, the fingertip oil attached by transportation, etc., is removed by the degreasing process described below.

[Resin material]

As the resin material used in the present invention, PC, PPS, PPA, PBT, PA6, PA66 and PP which are generally used in the general industry can be used as it is, and most thermoplastic resins can be used regardless of the content of glass and the content of mineral

On the other hand, in order to adjust the difference in coefficient of linear expansion between the aluminum alloy part and the resin composition part and to improve the mechanical strength of the resin composition part, the composite structure according to the embodiment of the present invention is characterized in that, 1 to 200 parts by mass, and more preferably 10 to 150 parts by mass.

Examples of the filler include fillers such as fibrous filler, granular filler and plate filler. Examples of the fibrous filler include glass fiber, carbon fiber and aramid fiber. Specific examples of the glass fiber include an average And chopped strands having a fiber diameter of 6 to 14 占 퐉.

Examples of the platelet-like and granular filler include calcium carbonate, mica, glass flake, glass balloon, magnesium carbonate, silica, talc, clay, pulverized products of carbon fibers and aramid fibers .

Even when the filler is not included, a strong force is required to firmly adhere and to remove the resin molding adhered to the metal. However, when the molded composite structure is subjected to a temperature cycle test, the adhesive strength rapidly decreases by repeating cycles in a resin system not including a filler.

There are two reasons for this, one is that there is a large difference between the metal shape and the thermoplastic synthetic resin composition at the linear expansion rate. For example, the coefficient of linear expansion of aluminum alloys is large among metals, but is considerably smaller than that of thermoplastic synthetic resins. The presence of the filler is lower the coefficient of thermal expansion of the thermoplastic resin composition, and close to the coefficient of thermal expansion of the aluminum alloy, about ^-1 2.5 × 10 ^-5 ℃.

When the type of filler and its content are selected, the coefficient of linear thermal expansion of the resin can be set to a value close to that of an aluminum alloy or the like. For example, when 40 to 50% of glass fiber is included in nylon 66, the coefficient of thermal expansion is 2 to 3 × 10 ^{-5 -1} .

The other one is the relationship between cooling and shrinkage of the metallic object after the insert molding and the molding shrinkage of the thermoplastic synthetic resin composition. Mold shrinkage of nylon 66 without filler is 0.6 to 2.5%. On the other hand, when the cooling and shrinking of the aluminum alloy, for example, from about 100 deg. C to about room temperature from the time of injection, about 0.2% is much smaller than the molding shrinkage ratio of the resin. When the time elapses after the mold is released from the injection-molding mold and the resin shrinks, the internal twist occurs at the interface, the interface breaks due to a slight impact, and is peeled off. When 40 to 50% of glass fiber is mixed with nylon 66, the molding shrinkage is reduced to about 0.4 to 0.6%. Even this is considerably larger than the reduction of the aluminum alloy, and even if the aluminum alloy is bonded, a large internal twist remains on the joint surface.

Therefore, the filler content of such a large amount does not give sufficient satisfaction with respect to the molding shrinkage ratio. Therefore, it is firstly necessary to design the injection bonding of the aluminum alloy and the resin composition in such a form that a large internal twist is hardly left on the joint surface. However, there is a need for a method of specifically confirming whether the design result was acceptable for use as a product. The method is surprisingly simple. In other words, when the injection joint is performed and left to stand for a few days and then broken to show a strength that can be satisfactorily satisfied, it can be said that the bonding strength is in conformity with the force to cause the fracture due to the internal twist.

Such a heterogeneous composite structure is heated at 60 to 70 ° C for 1 to 2 hours within a few days after injection bonding (annealing) to soften the resin to solve the internal twist. When the uniaxial composite structure subjected to the annealing treatment is subjected to a destructive test, if the expected strength is obtained, the design is successful, and the strength continues as long as there is no expansion due to swelling.

[Pretreatment process]

Hereinafter, a pretreatment process for aluminum alloy, which is a metal alloy part, will be described.

Generally, the surface of the processed aluminum alloy is contaminated with foreign matter and oil, and such foreign matter and oil must be removed. In the pretreatment process, neutral detergents including acid or basic chemicals, ultrasonic degreasing, and electrolytic degreasing may be used.

As the neutral detergent, an exclusive cleaning agent for aluminum alloy may come out on the market, but a kitchen detergent used in ordinary households may be used. If the kitchen detergent is used, it is preferable to remove the kitchen detergent component because the surfactant component contained in the kitchen detergent may be disturbed in the reaction of the present treatment.

[Main Processing Step]

Hereinafter, the present treatment process for the aluminum alloy after the pretreatment is described.

The pretreated aluminum alloy is cleaned with caustic soda and hydrochloric acid. In this case, hydrochloric acid serves to uniformly react sodium hydroxide by removing a protective film such as an oxide film on the surface of the aluminum alloy, which is unlikely to occur uniformly when an oxide film or the like is formed on the surface of the aluminum alloy .

Therefore, it is possible to destroy the oxide film by immersing the aluminum alloy in an aqueous hydrochloric acid solution and maintaining the appropriate time and temperature at a temperature of 50 to 80 ° C in an aqueous hydrochloric acid solution of 20 to 30%. That is, the surface of the aluminum alloy immersed in the aqueous hydrochloric acid solution melts down and oxide film breakage occurs.

Thereafter, the mixture is treated with a 1 to 5% aqueous solution of hydroxide at a temperature of 50 to 80 ° C for 1 to 5 minutes, washed with tap water to remove sodium hydroxide, and the water is removed in a short period of time. (500 magnification, 1,000 magnification, and 3000 magnification) through an electron microscope as shown in FIG. 4, it was confirmed that the entire surface of the surface was covered with grooves having an average perpendicular angle of grooves of 10 to 30 μm, This is confirmed by eyes, and if the treatment is done properly, the uniform surface can be seen.

If the resin material is injected in a state in which the above-described treatment is not properly performed, the tensile force on the composite structure is lowered, and the tensile force is not significantly changed when the treatment is carried out. On the other hand, The amount of the reacted substance is increased and the aging of the treatment liquid is accelerated.

[Molding / injection molding]

The injection mold is prepared, and the upper mold (movable mold) is opened to put the processed aluminum alloy component structure into the lower mold (fixed mold), and the upper mold is closed.

Thereafter, when the resin is injected into the mold, a composite structure in which an aluminum alloy, which is a metallic material of a different material, and a resin are joined and integrated can be obtained. During the injection molding, the conditions of the thermoplastic synthetic resin composition were such that injection molding was performed as mold temperature, injection nozzle temperature, and temperature applied to ordinary resin injection temperature.

That is, the mold temperature and the injection nozzle temperature are high, and a sufficient bonding effect can be exhibited between 120 ° C and 150 ° C.

In order to increase the bonding force, it is effective to raise the mold temperature slightly rather than a usual mold temperature of the resin material. Accordingly, the mold temperature varies depending on the type of resin. The mold should be made assuming that it is used at such a high temperature.

Hereinafter, embodiments of the present invention will be described in detail.

[Example 1]

A commercially available A6062 aluminum alloy plate having a thickness of 2.0 mm was purchased and then cut into a plurality of rectangular pieces of 16 mm x 45 mm.

A hole having a diameter of 3 mm was drilled in the end of the cut aluminum alloy piece with a press machine and then a jig made of titanium wire was prepared and 10 pieces of the aluminum alloy piece cut were placed on a jig made of titanium wire .

Next, the aluminum alloy pieces cut in the first washing tank containing common cleaning liquid (for example, pom-pong) sold in the general city were dipped and washed, and the aluminum alloy pieces were immersed in the washing liquid of the primary washing tank for about one minute, And washed.

Next, a 20% hydrochloric acid aqueous solution was prepared in the secondary treatment tank, and the temperature of the solution was adjusted to 50 占 폚. The aluminum alloy piece subjected to the first washing was immersed for 30 seconds and then washed with water.

Next, an aqueous solution of 5% caustic soda was prepared in the tertiary treatment tank and the temperature of the solution was adjusted to 50 캜. The secondary washed aluminum alloy piece was dipped in water for 3 minutes and washed with water. The washed aluminum alloy piece was placed in a dryer I dried the water.

Next, the aluminum alloy piece was taken out of the jig, stored in a poly bag, and stored at a magnification of 1,000 times through an electron microscope on the next day. It was confirmed that the entire surface was covered with a groove having a diameter of 1 to 30 um.

The aluminum alloy piece was stored, and after two days, the aluminum alloy piece was taken out and inserted into the injection molding die. (2.0 mm x 45.0 mm x 16.0 mm) 1, a resin portion (4 mm x 46 mm x 10 mm) 2, a bonding surface (10 mm x 6 mm) (3 mm) through a movable mold and a stationary mold of an injection- ), And the area of the joint surface was 0.60 cm ^{2. The} mold was closed and the PPA resin composition was injected to obtain a composite structure in which the aluminum alloy and the PPA resin were integrated.

At this time, the injection resin temperature was 300 占 폚 and the mold temperature was 130 占 폚. After 2 days, all ten samples were subjected to tensile fracture test with a tensile tester. In this test, the shear breaking force can be measured. As a result, the average shear breaking force is 320 kgf / cm ² .

<Test 1>

The composite structure of Example 1 was recreated and subjected to a reliability test thermal shock. At 100 cycle test across by 30 minutes at -40 ℃ ~ + 80 ℃, 315 shear breaking force of kgf / cm ^2, the front end 200 of the breakout force in the cycle test 322 kgf / cm ^2, at the front end of the 300 cycles test 312kgf / cm ² Destructive force, and showed little change in tensile force even under harsh conditions.

<Test 2>

Surface anodizing (a coloration and oxidation layer on the surface of aluminum alloy) was applied to products that prevented the aluminum alloy from bending. The average shear breaking strength has been or is 340kgf / cm ^2, the maximum tensile strength is 363 yielded kgf / cm ^2, which is generally due to the erosion of the joint does and surface enhanced occur it happens see nawatdago good results the aluminum alloy further hardened.

[Comparative Example 1]

The same experiment as in Example 1 was conducted using polycarbonate containing 30% of glass fiber as the resin composition. The shear breaking force of aluminum alloy and polycarbonate monolith is averaged 220 kgf / cm ² I came out. It is considered that the strength of the polycarbonate resin itself is low and the resin is broken at low strength

[Comparative Example 2]

The same experiment as in Example 1 was conducted using polypropylene as the resin composition. The shear breaking force of the aluminum alloy and polypropylene integral was 126 kgf / cm ² I came out. It is considered that the strength of the polypropylene resin itself is low so that the resin is broken at low strength.

[Comparative Example 3]

The same experiment as in Example 1 was carried out using nylon 6 containing 40% of glass fiber as the resin composition. The shear breaking force of the aluminum alloy and the polycarbonate monolith is an average of 330 kgf / cm ² I came out. The strength of this nylon is reinforced with glass fiber, so it is considered that high strength is obtained because of its strength.

[Comparative Example 4]

As in the case of Example 1, polyphenylene sulfide (PPS) not containing glass fibers was used as the resin composition. The shear breaking force of the aluminum alloy and the PPS monolithic product averaged 322 kgf / cm ² I came out. The strength of PPS seems to be high due to high self-strength of PPS.

[Example 2]

After purchasing an A7075 aluminum alloy plate with a thickness of 2.0 mm, it was cut into a plurality of rectangular pieces of 16 mm x 45 mm.

A hole having a diameter of 3 mm was drilled in the end of the cut aluminum alloy piece with a press machine and then a jig made of titanium wire was prepared and 10 pieces of the aluminum alloy piece cut were placed on a jig made of titanium wire .

Next, the aluminum alloy pieces cut in the first washing tank containing common cleaning liquid (for example, pom-pong) sold in the general city were immersed and washed, and the aluminum alloy pieces were immersed in the washing liquid of the first washing tank for about 1 minute to obtain 1 Car wash.

Next, a 20% hydrochloric acid aqueous solution was prepared in the secondary treatment tank, and the temperature of the solution was adjusted to 50 占 폚. The aluminum alloy piece subjected to the first washing was immersed for 30 seconds and then washed with water.

Next, an aqueous solution of 5% caustic soda was prepared in the tertiary treatment tank and the temperature of the solution was adjusted to 50 캜. The secondary washed aluminum alloy piece was dipped in water for 3 minutes and washed with water. The washed aluminum alloy piece was placed in a dryer I dried the water.

Next, the aluminum alloy piece was taken out of the jig and stored in a poly bag. The aluminum alloy piece was observed at a magnification of 1000 at the next day through an electron microscope, and it was confirmed that the entire surface was covered with a groove having a diameter of 5 to 20 um.

The aluminum alloy piece was stored, and after two days, the aluminum alloy piece was taken out and inserted into the injection molding die. (2.0 mm x 45.0 mm x 16.0 mm) 1, a resin portion (4 mm x 46 mm x 10 mm) 2 and a bonded surface (10 mm) as shown in Fig. 4 through a movable mold and a stationary mold of an injection- × 6 mm) (3). The area of the bonding surface was 0.60 cm ^{2. The} mold was closed and the PPA resin composition was injected to obtain a composite structure in which the aluminum alloy and the PPA resin were integrated.

The injection resin temperature was 300 占 폚, and the mold temperature was 130 占 폚. After 2 days, all ten samples were subjected to tensile fracture test with a tensile tester. In this test, the shear breaking force can be measured. As a result, the average shear breaking force was 315 kgf / cm ² .

[Example 3]

A 2.0 mm thick aluminum die casting was made and then cut into a large piece of 16 mm × 45 mm.

A hole having a diameter of 3 mm was drilled in the end of the cut aluminum alloy piece with a press machine and then a jig made of titanium wire was prepared and 10 pieces of the aluminum alloy piece cut were placed on a jig made of titanium wire .

Next, the cut aluminum alloy piece was immersed in a first washing tank containing a general washing liquid (for example, pom-pong) sold in the general market, and the aluminum alloy piece was immersed in the washing solution of the first washing tank for about 1 minute to obtain 1 Car wash.

Next, a 20% hydrochloric acid aqueous solution was prepared in the secondary treatment tank, and the temperature of the solution was adjusted to 50 占 폚. The aluminum alloy piece subjected to the first washing was immersed for 30 seconds and then washed with water.

Next, an aqueous solution of 5% caustic soda was prepared in the tertiary treatment tank and the temperature of the solution was adjusted to 50 캜. The secondary washed aluminum alloy piece was dipped in water for 3 minutes and washed with water. The washed aluminum alloy piece was placed in a dryer I dried the water.

Next, the aluminum alloy piece was taken out of the jig, stored in a poly bag, and stored at a magnification of 1000 times through an electron microscope the next day. It was confirmed that the entire surface was covered with a groove having a diameter of 10 to 30 um.

The aluminum alloy piece was stored, and after two days, the aluminum alloy piece was taken out and inserted into the injection molding die. (2.0 mm x 45.0 mm x 16.0 mm) 1, a resin portion (4 mm x 46 mm x 10 mm) 2, a bonding surface (10 mm x 6 mm) (3 mm) through a movable mold and a stationary mold of an injection- ), And the area of the joint surface was 0.60 cm ^{2. The} mold was closed and the PPA resin composition was injected to obtain a composite structure in which the aluminum alloy and the PPA resin were integrated.

At this time, the injection resin temperature was 300 占 폚 and the mold temperature was 130 占 폚. After 2 days, all ten samples were subjected to tensile fracture test with a tensile tester. In this test, the shear breaking force can be measured. As a result, the average shear breaking force was 280 kgf / cm ² .

[Example 4]

A commercially available A6062 aluminum alloy plate having a thickness of 2.0 mm was purchased and then cut into a plurality of rectangular pieces of 16 mm x 45 mm.

A hole having a diameter of 3 mm was drilled in the end of the cut aluminum alloy piece with a press machine and then a jig made of titanium wire was prepared and 10 pieces of the aluminum alloy piece cut were placed on a jig made of titanium wire .

Next, the cut aluminum alloy piece was immersed in a first washing tank containing a general washing liquid (for example, pom-pong) sold in the general market, and the aluminum alloy piece was immersed in the washing solution of the first washing tank for about 1 minute to obtain 1 Car wash.

Next, a 20% hydrochloric acid aqueous solution was prepared in the secondary treatment tank, and the temperature of the solution was adjusted to 50 占 폚. The aluminum alloy piece subjected to the first washing was immersed for 30 seconds and then washed with water.

Next, a 5% aqueous solution of caustic soda was prepared in the tertiary treatment tank, and the temperature of the solution was adjusted to 50 캜. The secondary washed aluminum alloy piece was immersed for 4 minutes and washed with water. The washed aluminum alloy piece was placed in a dryer I dried the water.

Next, the aluminum alloy piece was taken out of the jig, stored in a poly bag, and stored at a magnification of 1000 times through an electron microscope the next day. It was confirmed that the entire surface was covered with a groove having a diameter of 10 to 30 um.

At this time, the aluminum alloy piece was stored, and after 2 days, the aluminum alloy piece was taken out and inserted into the injection molding die. (2.0 mm x 45.0 mm x 16.0 mm) 1, a resin portion (4 mm x 46 mm x 10 mm) 2, a bonding surface (10 mm x 6 mm) (3 mm) through a movable mold and a stationary mold of an injection- ), And the area of the joint surface was 0.60 cm ^{2. The} mold was closed and the PPA resin composition was injected to obtain a composite structure in which the aluminum alloy and the PPA resin were integrated.

At this time, the injection resin temperature was 300 占 폚 and the mold temperature was 130 占 폚. After 2 days, all ten samples were subjected to tensile fracture test with a tensile tester. In this test, the shear breaking force can be measured. The average shear breaking force was 335 kgf / cm ² .

[Example 5]

A commercially available A7075 aluminum alloy sheet having a thickness of 2.0 mm was purchased and then cut into a plurality of rectangular pieces of 16 mm x 45 mm.

A hole having a diameter of 3 mm was drilled in the end of the cut aluminum alloy piece with a press machine and then a jig made of titanium wire was prepared and 10 pieces of the aluminum alloy piece cut were placed on a jig made of titanium wire .

Next, the cut aluminum alloy piece was immersed in a first washing tank containing a general washing liquid (for example, pom-pong) sold in the general market, and the aluminum alloy piece was immersed in the washing solution of the first washing tank for about 1 minute to obtain 1 Car wash.

Next, a 20% hydrochloric acid aqueous solution was prepared in the secondary treatment tank, and the temperature of the solution was adjusted to 50 占 폚. The aluminum alloy piece subjected to the first washing was immersed for 30 seconds and then washed with water.

Next, a 5% aqueous solution of caustic soda was prepared in the tertiary treatment tank, and the temperature of the solution was adjusted to 50 캜. The secondary washed aluminum alloy piece was immersed for 4 minutes and washed with water. The washed aluminum alloy piece was placed in a dryer I dried the water.

Next, the aluminum alloy piece was taken out of the jig, stored in a poly bag, and stored at a magnification of 1000 times through an electron microscope the next day. It was confirmed that the entire surface was covered with a groove having a diameter of 10 to 30 um.

The aluminum alloy piece was stored, and after two days, the aluminum alloy piece was taken out and inserted into the injection molding die. (2.0 mm x 45.0 mm x 16.0 mm) 1, a resin portion (4 mm x 46 mm x 10 mm) 2, a bonding surface (10 mm x 6 mm) (3 mm) through a movable mold and a stationary mold of an injection- ), And the area of the joint surface was 0.60 cm ^{2. The} mold was closed and the PPA resin composition was injected to obtain a composite structure in which the aluminum alloy and the PPA resin were integrated.

The injection resin temperature was 300 占 폚, and the mold temperature was 130 占 폚. After 2 days, all ten samples were subjected to tensile fracture test with a tensile tester. In this test, the shear breaking force can be measured. The average shear breaking force was 331 kgf / cm ² .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.

One; Aluminum alloy piece
2; Resin part
3; Abutment surface

Claims (7)

The aluminum alloy is made of an alloy of a non-heat treatment type which increases hardness and tensile strength by hardening after machining, a heat treatment type alloy which improves the mechanical properties by heat treatment, or a surface of metal which is an injection type die casting The oxide film on the surface is removed by immersing it in an aqueous hydrochloric acid solution. The surface of the oxide film is removed by immersing the metal in an aqueous hydrochloric acid solution having a concentration of 20 to 30% and a temperature of 50 to 80 ° C, and sodium hydroxide, potassium hydroxide, magnesium hydroxide , Wherein the metal is immersed in an aqueous hydroxide solution having a temperature of 50 to 80 DEG C and a concentration of 1 to 5% for 1 to 5 minutes to perform an etching treatment, and the etched metal is washed with tap water After removing the sodium hydroxide, the water was removed to obtain a metal alloy having an average length of 20 to 30 탆 and a groove portion and a protruding portion undercut. Gold; And
The surface of the metal alloy part is made of a thermoplastic resin and an engineering plastic. The surface of the metal alloy part is made of aramid fiber or fibrous filler composed of aramid fiber or padded strand fiber having an average fiber diameter of 6 to 14 占 퐉, calcium carbonate, mica, , And a resin part injection-molded with a resin material mixed with 10 to 150 parts by mass of a particulate filler composed of at least one selected from the group consisting of glass balloons, magnesium carbonate, silica, talc, clay, and pulverized products of carbon fibers and aramid fibers As a result,
An integrated metal - resin composite structure of different materials. delete delete An alloy of non-heat treatment type which is made of an aluminum alloy and hardened by hardening after machining to increase hardness and tensile strength, a heat-treated alloy which improves mechanical properties by heat treatment, or a die- Removing the oxide film on the surface by immersing the oxide film in an aqueous hydrochloric acid solution having a concentration of 20 to 30% and a temperature of 50 to 80 ° C by immersing the oxide film in an aqueous hydrochloric acid solution;
The metal is alloyed with at least one aqueous solution selected from the group consisting of sodium hydroxide, potassium hydroxide and magnesium hydroxide to form a metal alloy portion having a groove portion having a length of 20 to 30 탆 and a protruding portion undercut at an average perpendicular angle of 50 to 80 캜 , The metal is immersed in an aqueous hydroxide solution having a concentration of 1 to 5% for 1 to 5 minutes to be etched, and the etched metal is washed with tap water to remove sodium hydroxide, and the water is removed to obtain an average right angle of 20 Forming a metal alloy part having an undercut having a groove part and a protruding part with a thickness of about 30 占 퐉; And
The metallic alloy portion subjected to the nicking process is placed in an injection molding mold and then thermoplastic resin and engineering plastic are mixed with 100 parts by mass of a total of 100 parts by mass of the aramid fiber or a fiber strand composed of stranded fiber having an average fiber diameter of 6 to 14 占 퐉 A resin material mixed with 10 to 150 parts by mass of a particulate filler consisting of a filler or any one or more selected from among calcium carbonate, mica, glass flake, glass balloon, magnesium carbonate, silica, talc, clay, Characterized in that it comprises an injection-bonding step on the surface of the metal alloy part.
A method for manufacturing a monolithic metallic resin composite structure of different materials.
delete delete delete

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