Coating process for injection molding of automobile plastic parts

Abstract

The invention provides a coating process for injection molding of automobile plastic parts, and relates to the field of spraying processes. The coating process for injection molding of the automobile plastic parts comprises the process steps that 1, the automobile plastic parts are detected, specifically, whether a jig has the problems of burrs, material shortage, deformation and the like or not is detected, and the jig needs to be replaced again if the jig is unqualified; 2, the injection molding accessories are loaded into a jig, the jig is put into an oven after being loaded, and high-temperature annealing is set; and 3, black primer is sprayed to the injection molding accessories, and then the injection molding accessories are taken out and placed on the pearl wool partition plate. According to the automobile injection molding part machining technology, in the injection molding part spraying process, the automobile injection molding part can be effectively protected through the four spraying processes of bottom face black paint spraying, primer spraying and aluminum plating and finally finish paint spraying, meanwhile, a jig of the machining technology can be repeatedly used, operation is convenient and fast, the injection molding coating cost is greatly reduced, and the production efficiency is improved. And the coating time is shortened, and the method is very suitable for popularization and use.

Description

Technical Field

[0001] The invention relates to the field of spraying technology, in particular to a coating technology for injection molding of automobile plastic parts. Background Art

[0002] With the vigorous development of the automobile industry, consumers have higher and higher requirements for the appearance and interior quality of automobiles. Early automobiles were mainly made of metal materials, but plastics have gradually increased in the proportion of automobile accessories due to their light weight, high design flexibility and many other advantages. Although plastics themselves have many advantages, they are deficient in corrosion resistance, wear resistance and weather resistance. If the plastic accessories after injection molding are not treated, they are prone to aging, fading, surface wear and other problems. Therefore, the present invention proposes a coating process for injection molding of automobile plastic accessories, which can optimize the coating process of automobile injection molding accessories and make the coating of injection molding accessories more durable. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a coating process for injection molding of automobile plastic accessories. By performing four spraying processes, namely, spraying bottom black paint, spraying primer and aluminum plating, and finally spraying topcoat during the spraying process of the injection molded accessories, the automobile injection molded accessories can be effectively protected. The painted surface of the injection molded accessories after painting and aluminum plating has good wear resistance, which can reduce the damage to the plastic accessories caused by these frictions, and can also avoid the problems of oxidation and brittleness of the injection molded accessories, and can greatly improve their corrosion resistance.

[0005] (II) Technical solution

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a coating process for injection molding of automobile plastic parts, the process steps of the coating process for injection molding of automobile plastic parts are:

[0007] Step 1: Inspection of automotive injection molding parts, check whether the fixture has burrs, material shortages, deformation and other problems. If unqualified, the fixture needs to be replaced;

[0008] Step 2: Install the injection molded parts into the fixture, put the fixture into the oven, and set the high temperature for annealing;

[0009] Step 3: Spray the injection molded parts with black primer, and then take out the injection molded parts and place them on the pearl cotton partition;

[0010] Step 4: Remove the jig and wipe off the paint. Remove the jig of the injection molding parts and wipe off the paint to make the injection molding surface smooth.

[0011] Step 5: Spray primer, clean the aluminum-plated injection molded parts and then spray primer for electroplating;

[0012] Step 6: PVD sputtering aluminum plating, hang the injection molded parts into the PVD equipment for aluminum plating process;

[0013] Step 7: Spray the topcoat on the aluminum-plated injection molded parts;

[0014] Step 8: Perform a comprehensive inspection on the injection molded parts that have been sprayed with topcoat, and place them in packaging boxes for packaging after confirming that they are qualified.

[0015] Preferably, in the pre-installed jig of step 2 of the coating process for injection molding of the injection molded part, the uncoated injection molded part needs to be loaded into the base jig, and then loaded into the front jig and the rear jig after being fixed, and it is confirmed whether the front jig and the rear jig are pressing the injection molded part tightly;

[0016] Through the above technical solution, the jig must not have defects such as burrs, missing materials, deformation, etc. During operation, the products must not be directly overlapped, and the jig must not scratch or bump the products.

[0017] Preferably, in the high temperature annealing process of step 2 of the coating process for injection molding of the injection molding accessories, the installed injection molding jig is placed in the rubber partition of the trolley, and then pushed into the oven, and the annealing temperature is set to 80 degrees Celsius / 2 hours. After the annealing is completed, the whole vehicle is placed in the black bottom area to be sprayed;

[0018] Through the above technical solution, the jig and the product must be installed in place. If the jig is found to be broken or damaged, it cannot be used. The products with the jig installed cannot be placed on paper partitions for annealing.

[0019] Preferably, in the process of spraying the black bottom in step 3 of the coating process for injection molding of the injection molding accessory, firstly, take the pre-installed product, align the jig sleeve with the sleeve rod jig on the line, and install it. It is necessary to wipe the product with a dust cloth dipped in white kerosene to make the spray surface clean and dust-free, and use an air gun to blow the jig comprehensively, spray the black primer after blowing, and take the jig out from the sleeve rod after spraying;

[0020] Through the above technical solution, if the fixture is found to be loose during material removal, it needs to be pressed tightly. When wiping the product, the sprayed surface needs to be wiped completely in place, and white spirit should be dipped appropriately. When blowing the product, it should be blown in a full circle. Pay attention to the technique when removing the fixture to avoid scratching the product.

[0021] Preferably, in the process of wiping the flying paint in step 4 of the painting process for injection molding of the injection molded accessory, it is necessary to remove the wrapped front fixture and the rear fixture, and then wipe the injection molded accessory with alcohol, and wait for the primer to be sprayed after wiping.

[0022] Preferably, in the primer spraying process of step 5 of the coating process for injection molding of the injection molded accessories, take the pre-installed product, align the fixture sleeve with the sleeve rod fixture on the line and install it, and use a dust cloth dipped in white kerosene to wipe the product to wipe the sprayed surface clean, and then use a machine to automatically spray the primer. After the primer is sprayed, the sleeve rod on the line is taken out and placed on the electroplating hanger.

[0023] Preferably, in the PVD sputtering aluminum plating process of step 6 of the coating process for injection molding of the injection molded parts, each hanger is aligned with the corresponding position of the plating furnace and installed, and the entire furnace is closed after installation, and the staff operates the PVD sputtering aluminum plating, and after plating, the door is opened, and each hanger product is taken out and placed on the trolley to be sprayed with topcoat;

[0024] According to the above technical solution, when loading into the aluminum plating furnace, each hanger needs to be aligned with the corresponding position of the plating furnace.

[0025] Preferably, in the spraying topcoat process of step 7 of the coating process for injection molding of the injection molded parts, the jig taken out from the aluminizing furnace is taken out again to place the pre-installed product, the jig sleeve is aligned with the sleeve rod jig on the line, and the product is wiped with a dust cloth dipped in white kerosene to wipe the sprayed surface clean, and then the machine is used to automatically spray the topcoat;

[0026] Through the above technical solution, the topcoat is unloaded, the product is taken out from the jig and placed in a foam box, and the jig is then taken out from the line and placed in a box.

[0027] (III) Beneficial effects

[0028] The present invention provides a coating process for injection molding of automobile plastic parts. It has the following beneficial effects:

[0029] The invention provides a coating process for injection molding of automobile plastic accessories. The automobile injection molding accessories can be effectively protected by spraying bottom black paint, spraying primer and aluminum plating, and finally spraying topcoat in the process of spraying the injection molding accessories. The coating surface of the injection molding accessories after painting and aluminum plating has good wear resistance, which can reduce the damage of these frictions to the plastic accessories, and can also avoid the problems of oxidation and brittleness of the injection molding accessories. The corrosion resistance can be greatly improved, and the damage and replacement frequency caused by corrosion can be reduced. At the same time, the jig of the processing technology can be repeatedly used and is easy to operate, which greatly reduces the cost of injection molding coating and shortens the coating time. It is very suitable for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The overall flow chart of the coating process for injection molding of automobile plastic parts of the present invention;

[0031] Figure 2A base fixture for the automobile plastic parts of the present invention;

[0032] Figure 3 A front jig for the automotive injection molding parts of the present invention;

[0033] Figure 4 A rear fixture for the automotive injection molding parts of the present invention;

[0034] Figure 5 It is an overall schematic diagram of the automobile injection molding accessory of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the description of this application, it should be noted that the terms used here are only for describing specific implementations, and are not intended to limit the exemplary implementations according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0036] Embodiment 1:

[0037] like Figure 1-5 As shown, an embodiment of the present invention provides a coating process for injection molding of automobile plastic parts, and the process steps of the coating process for injection molding of automobile plastic parts are:

[0038] Step 1: Inspection of automotive injection molding parts, check whether the fixture has burrs, material shortages, deformation and other problems. If unqualified, the fixture needs to be replaced;

[0039] Step 2: Install the injection molded parts into the fixture, put the fixture into the oven, and set the high temperature for annealing;

[0040] Step 3: Spray the injection molded parts with black primer, and then take out the injection molded parts and place them on the pearl cotton partition;

[0041] Step 4: Remove the jig and wipe off the paint. Remove the jig of the injection molding parts and wipe off the paint to make the injection molding surface smooth.

[0042] Step 5: Spray primer, clean the aluminum-plated injection molded parts and then spray primer for electroplating;

[0043] Step 6: PVD sputtering aluminum plating, hang the injection molded parts into the PVD equipment for aluminum plating process;

[0044] Step 7: Spray the topcoat on the aluminum-plated injection molded parts;

[0045] Step 8: Perform a comprehensive inspection on the injection molded parts that have been sprayed with topcoat, and place them in packaging boxes for packaging after confirming that they are qualified.

[0046] Embodiment 2:

[0047] like Figure 1-5 As shown, in the pre-installed jig in step 2, the unpainted injection molding parts need to be installed in the base jig, and then installed in the front jig and the rear jig after fixing, and confirm whether the front jig and the rear jig are pressed against the injection molding parts. Through the above technical scheme, the jig must not have burrs, missing materials, deformation and other defects. The products cannot be directly overlapped during operation, and the jig must not scratch or bump the products. In the high-temperature annealing process of step 2 of the coating process for injection molding of the injection molding parts, the installed injection molding jig is placed in the rubber partition of the trolley, and then pushed into the oven, and the annealing temperature is set to 80 degrees Celsius / 2 hours. After annealing, the entire vehicle is placed in the black bottom area to be sprayed. The jig and the product need to be installed in place. If a jig with a broken buckle or damaged is found, it cannot be used. The product with the jig installed cannot be placed on a paper partition for annealing.

[0048] In the process of spraying the black bottom in step 3, first take the product with the pre-installed jig, align the jig sleeve with the sleeve rod jig on the line, wipe the product with a dust cloth dipped in white kerosene to make the spray surface clean and dust-free, and use an air gun to blow the jig thoroughly. After blowing, spray the black primer. After spraying, take the jig out of the sleeve rod. If the jig is found to be loose during material processing, it needs to be pressed tightly. When wiping the product, the spray surface needs to be wiped in place, dip in white kerosene appropriately, and blow the product in a full circle. Pay attention to the technique when unloading and removing the jig to avoid scratching the product.

[0049] In the process of wiping the flying paint in step 4, it is necessary to remove the wrapped front fixture and the rear fixture, and then wipe the injection molded parts with alcohol. After wiping, wait for the primer to be sprayed.

[0050] In the primer spraying process of step 5, take the pre-installed product, align the fixture sleeve with the sleeve rod fixture on the line, and use a dust cloth dipped in white kerosene to wipe the product to wipe the sprayed surface clean. Then use the machine to automatically spray the primer. After the primer is sprayed, take out the sleeve rod on the line and put it on the electroplating hanger.

[0051] In the PVD sputtering aluminum plating process of step 6, each hanger is installed in the corresponding position of the plating furnace. After the whole furnace is installed, it is closed and the staff operates the PVD sputtering aluminum plating. After plating, the door is opened, each hanger product is taken out, and placed on the trolley for spraying the topcoat. Before loading into the aluminum plating furnace, each hanger needs to be installed in the corresponding position of the plating furnace.

[0052] In the spraying topcoat process of step 7, the jig taken out from the aluminizing furnace is taken out again to pick up the pre-installed product, the jig sleeve is aligned with the sleeve rod jig on the line, and the product is wiped with a dust cloth dipped in white kerosene to wipe the sprayed surface clean. Then the machine is used to automatically spray the topcoat, the topcoat is unloaded, the product is taken out from the jig, and placed in a foam box. The jig is then taken out from the line and placed in a box.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coating process for injection molding of automobile plastic parts, characterized in that: The process steps of the coating process for injection molding of automotive plastic parts are: Step 1: Inspection of automotive injection molding parts, check whether the fixture has burrs, material shortages, deformation and other problems. If unqualified, the fixture needs to be replaced; Step 2: Install the injection molded parts into the fixture, put the fixture into the oven, and set the high temperature for annealing; Step 3: Spray the injection molded parts with black primer, and then take out the injection molded parts and place them on the pearl cotton partition; Step 4: Remove the jig and wipe off the paint. Remove the jig of the injection molding parts and wipe off the paint to make the injection molding surface smooth. Step 5: Spray primer, clean the aluminum-plated injection molded parts and then spray primer for electroplating; Step 6: PVD sputtering aluminum plating, hang the injection molded parts into the PVD equipment for aluminum plating process; Step 7: Spray the topcoat on the aluminum-plated injection molded parts; Step 8: Perform a comprehensive inspection on the injection molded parts that have been sprayed with topcoat, and place them in packaging boxes for packaging after confirming that they are qualified.

2. The coating process for injection molding of automobile plastic parts according to claim 1, characterized in that: In the pre-installed jig of step 2 of the painting process for injection molding of the injection molded part, the unpainted injection molded part needs to be installed in the base jig, and then installed in the front jig and the rear jig after being fixed, and confirm whether the front jig and the rear jig are pressing the injection molded part tightly.

3. The coating process for injection molding of automobile plastic parts according to claim 1, characterized in that: In the high-temperature annealing process of step 2 of the painting process for injection molding of the injection molded parts, the installed injection molding fixture is placed in the rubber partition of the trolley, and then pushed into the oven, and the annealing temperature is set to 80 degrees Celsius / 2 hours. After the annealing is completed, the entire vehicle is placed in the black bottom area to be sprayed.

4. The coating process for injection molding of automobile plastic parts according to claim 1, characterized in that: In the process of spraying the black bottom in step 3 of the coating process for injection molding of the injection molded parts, first take the pre-installed product, align the fixture sleeve with the sleeve rod fixture on the line, wipe the product with a dust cloth dipped in white kerosene to make the spray surface clean and dust-free, and use an air gun to blow the fixture thoroughly, spray the black primer after blowing, and take the fixture out of the sleeve rod after spraying.

5. The coating process for injection molding of automobile plastic parts according to claim 1, characterized in that: In the process of wiping the flying paint in step 4 of the painting process for injection molding of the injection molded parts, it is necessary to remove the wrapped front fixture and the rear fixture, and then wipe the injection molded parts with alcohol, and wait for the primer to be sprayed after wiping.

6. The coating process for injection molding of automobile plastic parts according to claim 1, characterized in that: In the primer spraying process of step 5 of the coating process for injection molding of the injection molded parts, take the pre-installed product, align the fixture sleeve with the sleeve rod fixture on the line, and use a dust cloth dipped in white kerosene to wipe the product to wipe the sprayed surface clean, and then use the machine to automatically spray the primer. After the primer is sprayed, the sleeve rod on the line is taken out and placed on the electroplating hanger.

7. The coating process for injection molding of automobile plastic parts according to claim 1, characterized in that: In the PVD sputtering aluminum plating process of step 6 of the coating process for injection molding of the injection molded accessories, each hanger is aligned with the corresponding position of the plating furnace and installed. After the entire furnace is installed, it is closed and the staff operates the PVD sputtering aluminum plating. After plating, the door is opened, each hanger product is taken out, and placed on the trolley to be sprayed with the topcoat.

8. The coating process for injection molding of automobile plastic parts according to claim 1, characterized in that: In the spraying topcoat process of step 7 of the coating process for injection molding of the injection molded accessories, the jig taken out from the aluminizing furnace is taken out again to install the pre-treated product, the jig sleeve is aligned with the sleeve rod jig on the line, and the product is wiped with a dust cloth dipped in white kerosene to wipe the sprayed surface clean, and then the machine is used to automatically spray the topcoat.

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