Manufacturing method of decorative part for automobile and decorative part

Abstract

The invention provides a manufacturing method of a decorative part for an automobile, the decorative part has a preset color, the manufacturing method comprises the steps that first resin in a molten state is obtained, and the first resin has the preset color after being cured; first resin is injected into the first mold cavity, and a framework layer of the decorative part is obtained through curing forming; the framework layer is placed in the second mold cavity, and the framework layer and the bottom of the second mold cavity are spaced by a preset distance to form a closed cavity; molten second resin is obtained, and the second resin is in a transparent state after being cured; injecting second resin into the closed cavity, and curing and molding on the surface of the framework layer to obtain a transparent layer of the decorative part; and the framework layer covered with the transparent layer is demolded, and the decorative part is obtained. According to the manufacturing method of the decorative part, the color developing part of the part can be effectively prevented from being scratched, the part cost is reduced, and meanwhile environmental pollution caused by paint spraying is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of automobile decoration, and in particular to a method for manufacturing a decorative part for an automobile and the decorative part. Background Art

[0002] Decorative parts are one of the important styling elements of automobile interior and exterior decoration. Decorative parts can include high-gloss decorative parts such as high-gloss black decorative parts, high-gloss white decorative parts, and high-gloss color decorative parts. Taking high-gloss black decorative parts as an example, the current method for making high-gloss black decorative parts is usually to spray UV-cured high-gloss black paint on the injection molded skeleton. However, due to its process and appearance quality problems, the pass rate is not high, resulting in rising costs, high parts prices, and the painting process is not environmentally friendly. Summary of the invention

[0003] To at least partially solve the above-mentioned problems, according to one aspect of the present application, an embodiment of the present application provides a method for manufacturing a decorative part for an automobile, wherein the decorative part has a preset color, and the manufacturing method comprises: obtaining a first resin in a molten state, wherein the first resin has a preset color after solidification; injecting the first resin into a first mold cavity, and solidifying and molding the first resin to obtain a skeleton layer of the decorative part, wherein the cross-sectional shape of the first mold cavity is the same as the cross-sectional shape of the decorative part; placing the skeleton layer into a second mold cavity, and making the skeleton layer and the bottom of the second mold cavity spaced a preset distance apart to form a closed cavity, wherein the cross-sectional shape of the second mold cavity is the same as the cross-sectional shape of the decorative part; obtaining a second resin in a molten state, wherein the second resin is in a transparent state after solidification; injecting the second resin into the closed cavity, and solidifying and molding the surface of the skeleton layer to obtain a transparent layer of the decorative part, wherein the thickness of the transparent layer is the same as the preset distance; demolding the skeleton layer covered with the transparent layer to obtain the decorative part.

[0004] In some embodiments, the first resin is a polycarbonate / acrylonitrile-butadiene-styrene terpolymer blend or polycarbonate.

[0005] In some embodiments, the preset color of the first resin after being cured is high gloss black, high gloss white, or high gloss color.

[0006] In some embodiments, the second resin is thermoplastic polyurethane or two-component thermal curing polyurethane.

[0007] In some embodiments, the surface roughness of the first mold cavity and the second mold cavity Ra is less than 0.032 μm.

[0008] In some embodiments, a three-dimensional decorative texture is provided on the bottom of the first mold cavity.

[0009] In some embodiments, the thickness of the skeleton layer is 2 mm to 3.5 mm, and the thickness of the transparent layer is 0.3 mm to 3 mm.

[0010] In some embodiments, the thickness of the transparent layer is 1 mm to 3 mm.

[0011] In some embodiments, the decorative part is manufactured in an injection molding machine, the injection molding machine includes a first mold cavity and a second mold cavity, the first mold cavity and the second mold cavity are arranged at different circumferential positions on the same circumference, the depth of the second mold cavity is greater than the depth of the first mold cavity, the injection molding machine also includes a movable mold that can translate and rotate, the movable mold can be molded with the first mold cavity and the second mold cavity, the decorative part manufacturing method includes: controlling the movable mold to mold with the first mold cavity, and then injecting a first resin into the first mold cavity, and after pressure maintenance and cooling, the first resin is solidified and formed into a bone The movable mold is controlled to translate in a direction away from the first mold cavity, so that the movable mold brings the skeleton layer out of the first mold cavity; the movable mold is controlled to rotate, so that the movable mold drives the skeleton layer to align with the second mold cavity; the movable mold is controlled to translate in a direction close to the second mold cavity, so that the movable mold puts the skeleton layer into the second mold cavity, wherein, when the movable mold is molded with the second mold cavity, the skeleton layer on the movable mold is spaced a preset distance from the bottom of the second mold cavity to form a closed cavity; the second resin is injected into the closed cavity, and after pressure maintenance and cooling, the second resin is solidified on the surface of the skeleton layer to form a transparent layer.

[0012] According to another aspect of the present application, an embodiment of the present application further provides a decorative part for an automobile, and the decorative part is manufactured by the manufacturing method provided by any embodiment of the present application.

[0013] The embodiments of the present application provide a method for manufacturing decorative parts for automobiles, in which a skeleton layer obtained by injection molding is provided with color, and a transparent layer is injection-molded on the skeleton layer to protect the skeleton layer so that the color and gloss of the skeleton layer can be presented through the transparent layer. While ensuring the color and gloss of the parts, the colored parts of the parts can be effectively prevented from being scratched. The entire manufacturing process does not require a spray painting process, thereby reducing the appearance quality problems that are easily caused by the spray painting process, improving the product qualification rate, reducing the cost of parts, and avoiding environmental pollution caused by spray painting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1It is a schematic diagram of the structure of the decorative part provided in the embodiment of the present application;

[0016] Figure 2a is a schematic diagram of the movable mold and the first mold cavity when the mold is closed according to an embodiment of the present application;

[0017] Figure 2b It is a schematic diagram of the injection molding skeleton layer provided in an embodiment of the present application;

[0018] Figure 2c It is a schematic diagram of the movable mold after opening and rotating provided in the embodiment of the present application;

[0019] Figure 2d It is a schematic diagram of the movable mold provided in an embodiment of the present application when placing the skeleton layer into the second mold cavity;

[0020] Figure 2e is a schematic diagram of the injection molding of a transparent layer provided in an embodiment of the present application;

[0021] Figure 2f It is a schematic diagram of the decorative part after demoulding provided in the embodiment of the present application.

[0022] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0023] The technical scheme of the preferred embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection claimed in the present application.

[0024] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] like Figure 1 and Figure 2a~Figure 2fAs shown, according to one aspect of the present application, an embodiment of the present application provides a method for manufacturing a decorative part for an automobile, wherein the decorative part has a preset color. In the present application, the decorative part may be a decorative part with a high gloss color in the interior or exterior of an automobile, and the decorative part may be a high gloss black decorative part, a high gloss white decorative part, or a high gloss color (such as high gloss red, high gloss blue, high gloss green, high gloss brown, etc.) decorative part. Taking a high gloss black decorative part as an example, the decorative part may be a high gloss black sub-panel decorative panel, a high gloss black door guard handle cover, a high gloss black door guard decorative panel, a high gloss black instrument panel decorative panel, and the like.

[0026] The embodiment of the present application provides a method for manufacturing a decorative part, comprising: obtaining a molten first resin, which has a preset color after solidification; injecting the first resin into a first mold cavity A, solidifying and molding to obtain a skeleton layer 1 of the decorative part, the cross-sectional shape of the first mold cavity A being the same as the cross-sectional shape of the decorative part; placing the skeleton layer 1 into a second mold cavity B, and making the skeleton layer 1 and the bottom of the second mold cavity B spaced apart by a preset distance to form a closed cavity, the cross-sectional shape of the second mold cavity B being the same as the cross-sectional shape of the decorative part; obtaining a molten second resin, which is transparent after solidification; injecting the second resin into the closed cavity, solidifying and molding on the surface of the skeleton layer 1 to obtain a transparent layer 2 of the decorative part, the thickness of the transparent layer 2 being the same as the preset distance; demolding the skeleton layer 1 covered with the transparent layer 2 to obtain the decorative part. The second mold cavity B can have the same cross-sectional shape as the first mold cavity A, and the depth of the second mold cavity B can be slightly greater than the depth of the first mold cavity A, so that when the skeleton layer 1 is placed in the second mold cavity B, the skeleton layer 1 can be spaced apart from the bottom of the second mold cavity B. The specific sizes of the second mold cavity B and the first mold cavity A can be determined according to the size of the decorative part.

[0027] The embodiment of the present application provides a method for manufacturing decorative parts for automobiles, in which a skeleton layer 1 obtained by injection molding is provided with color, and a transparent layer 2 is injection-molded on the skeleton layer 1 to protect the skeleton layer 1, so that the color and gloss of the skeleton layer 1 can be presented through the transparent layer 2. While ensuring the color and gloss of the parts, the colored part of the parts can be effectively prevented from being scratched. The entire manufacturing process does not require a painting process, which reduces the appearance quality problems that are easily caused by the painting process, improves the product qualification rate, reduces the part cost (the product material cost is saved by more than 25% under actual application conditions), and avoids environmental pollution caused by painting.

[0028] In some embodiments, the first resin is a polycarbonate / acrylonitrile-butadiene-styrene terpolymer mixture (PC / ABS) or polycarbonate (PC). Preferably, the first resin is a high-gloss polycarbonate / acrylonitrile-butadiene-styrene terpolymer mixture (PC / ABS), for example, it can be CB2430HG material of Pulite, of course, it can also be high-gloss polycarbonate. In some embodiments, the preset color of the first resin after curing is high-gloss black, high-gloss white or high-gloss color, so as to respectively produce high-gloss black decorative parts, high-gloss white decorative parts, and high-gloss color decorative parts. For example, the high-gloss color can include high-gloss red, high-gloss blue, high-gloss green, high-gloss brown and other colors.

[0029] In some embodiments, the second resin is thermoplastic polyurethane. After curing, the thermoplastic polyurethane (TPU) material is transparent and can meet the performance requirements of automotive applications such as weather resistance, light resistance, chemical resistance, scratch resistance, emission performance, and odor. For example, the thermoplastic polyurethane can be Covestro's Desmopan ® Thermoplastic polyurethane, BASF's Elastollan ® Thermoplastic polyurethane. Of course, in other embodiments, the second resin can also be a two-component thermosetting polyurethane. The two-component thermosetting polyurethane also has the characteristics of transparency and high wear resistance.

[0030] In some embodiments, the surface roughness Ra of the first mold cavity A and the second mold cavity B is less than 0.032 μm. In this embodiment, by controlling the surface roughness of the first mold cavity A and the second mold cavity B, the surfaces of the first mold cavity A and the second mold cavity B can have a higher level of polishing, which can make the gloss of the decorative parts better.

[0031] In some embodiments, a three-dimensional decorative texture is provided at the bottom of the first mold cavity A. In this embodiment, this arrangement can make the finished decorative parts present different patterns, thereby facilitating the acquisition of more beautiful and diverse decorative parts. Exemplarily, the three-dimensional decorative texture can be obtained by laser engraving.

[0032] In some embodiments, the thickness of the skeleton layer 1 is 2 mm to 3.5 mm, and the thickness of the transparent layer 2 is 0.3 mm to 3 mm. The thickness of the skeleton layer 1 and the transparent layer 2 can meet the requirements of the structure, strength and shape of the decorative parts. Preferably, in some embodiments, the thickness of the transparent layer 2 is 1 mm to 3 mm. This arrangement increases the thickness of the transparent layer 2, can produce a depth of field effect, and enhance the three-dimensional decorative effect.

[0033] Combination Figure 2a~Figure 2fIn some embodiments, the decorative part is manufactured in an injection molding machine, which includes a first mold cavity A and a second mold cavity B. The first mold cavity A and the second mold cavity B are arranged at different circumferential positions of the same circle, for example, they can be arranged at two end positions of the same diameter of the circle. The depth of the second mold cavity B is greater than the depth of the first mold cavity A. The injection molding machine also includes a first injection tube C and a second injection tube D. The first injection tube C is connected to the first mold cavity A to inject material into the first mold cavity A through the first injection tube C, and the second injection tube D is connected to the second mold cavity B to inject material into the second mold cavity B through the second injection tube D. The injection molding machine also includes a movable mold that can translate and rotate, and the movable mold can be molded with the first mold cavity A and the second mold cavity B. The method for manufacturing a decorative part includes: controlling the movable mold to be molded with the first mold cavity A (see Figure 2a ), and then inject the first resin into the first mold cavity A, and after pressure maintenance and cooling, the first resin is solidified to form the skeleton layer 1 (see Figure 2b ); Control the movable mold to translate in a direction away from the first mold cavity A, so that the movable mold brings the skeleton layer 1 out of the first mold cavity A; Control the movable mold to rotate so that the movable mold drives the skeleton layer 1 to align with the second mold cavity B (refer to Figure 2c ), for example, the movable mold can be controlled to rotate 180°; the movable mold can be controlled to translate toward the direction close to the second mold cavity B, so that the movable mold puts the skeleton layer 1 into the second mold cavity B, wherein when the movable mold is molded with the second mold cavity B, the skeleton layer 1 on the movable mold is spaced a preset distance from the bottom of the second mold cavity B to form a closed cavity (see Figure 2d ); injecting the second resin into the closed cavity (refer to Figure 2e ), after pressure maintenance and cooling, the second resin is solidified on the surface of the skeleton layer 1 to form a transparent layer 2 (see Figure 2f ). During continuous production, the above steps are repeated in sequence.

[0034] According to another aspect of the present application, an embodiment of the present application further provides a decorative part for an automobile, and the decorative part is manufactured by the manufacturing method provided by any embodiment of the present application.

[0035] The decorative parts provided in the embodiments of the present application have a double-layer hierarchical structure consisting of a skeleton layer and a transparent layer. The color and texture functions of the decorative parts are provided by the skeleton layer and presented to the user through the transparent layer; the scratch resistance, wear resistance, chemical resistance, and weather resistance of the decorative parts are realized by the transparent layer.

[0036] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0037] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are only for illustration and not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for manufacturing a decorative part for an automobile, wherein the decorative part has a preset color, characterized in that: The production method comprises: Obtaining a first resin in a molten state, wherein the first resin has the preset color after being solidified; Injecting the first resin into a first mold cavity and curing and molding it to obtain a skeleton layer of the decorative part, wherein the cross-sectional shape of the first mold cavity is the same as the cross-sectional shape of the decorative part; Put the skeleton layer into a second mold cavity, and make the skeleton layer and the bottom of the second mold cavity separated by a preset distance to form a closed cavity, wherein the cross-sectional shape of the second mold cavity is the same as the cross-sectional shape of the decorative part; Obtaining a second resin in a molten state, wherein the second resin is in a transparent state after solidification; Injecting the second resin into the closed cavity, and curing and molding the resin on the surface of the skeleton layer to obtain a transparent layer of the decorative part, wherein the thickness of the transparent layer is the same as the preset distance; The skeleton layer covered with the transparent layer is demoulded to obtain the decorative part.

2. The method according to claim 1, characterized in that The first resin is a polycarbonate / acrylonitrile-butadiene-styrene terpolymer mixture or polycarbonate.

3. The method according to claim 2, characterized in that The preset color of the first resin after curing is high-gloss black, high-gloss white or high-gloss color.

4. The method according to claim 1, characterized in that: The second resin is thermoplastic polyurethane or two-component thermosetting polyurethane.

5. The method according to claim 1, characterized in that The surface roughness of the first mold cavity and the second mold cavity Ra is less than 0.032 μm.

6. The method according to claim 1, characterized in that A three-dimensional decorative texture is arranged at the bottom of the first mold cavity.

7. The method according to claim 1, characterized in that The thickness of the skeleton layer is 2 mm to 3.5 mm, and the thickness of the transparent layer is 0.3 mm to 3 mm.

8. The method according to claim 1, characterized in that The thickness of the transparent layer is 1 mm to 3 mm.

9. The method according to claim 1, characterized in that: The decorative part is manufactured in an injection molding machine, the injection molding machine includes the first mold cavity and the second mold cavity, the first mold cavity and the second mold cavity are arranged at different circumferential positions on the same circumference, the depth of the second mold cavity is greater than the depth of the first mold cavity, the injection molding machine also includes a movable mold that can be translated and rotated, the movable mold can be molded with the first mold cavity and the second mold cavity, and the decorative part manufacturing method includes: Controlling the movable mold to close the first mold cavity, then injecting the first resin into the first mold cavity, and after pressure holding and cooling, solidifying the first resin to form the skeleton layer; Controlling the movable mold to translate in a direction away from the first mold cavity, so that the movable mold brings the skeleton layer out of the first mold cavity; Controlling the movable mold to rotate so that the movable mold drives the skeleton layer to align with the second mold cavity; Controlling the movable mold to translate toward the direction close to the second mold cavity, so that the movable mold puts the skeleton layer into the second mold cavity, wherein when the movable mold is molded with the second mold cavity, the skeleton layer on the movable mold is spaced from the bottom of the second mold cavity by the preset distance to form the closed cavity; The second resin is injected into the closed cavity, and after pressure maintenance and cooling, the second resin is solidified on the surface of the skeleton layer to form the transparent layer.

10. A decorative part for an automobile, characterized in that: The decorative part is made by the manufacturing method described in any one of claims 1-9.

Images