In-mold painting method, apparatus and appearance based on a non-polar substrate

Abstract

The application discloses an in-mold painting method based on a non-polar base material, an in-mold painting device and an appearance part. The method comprises the following steps: injecting a thermoplastic material into a first mold cavity and injecting a reaction-molding polyurethane material into a second mold cavity at the same time, so as to obtain a non-polar base material part and a paint film respectively; sequentially matching a plurality of fixed cores with the first mold cavity, so that each fixed core has one non-polar base material part; and sequentially processing surfaces of the non-polar base material parts on each fixed core, so that each non-polar base material part after surface processing is combined with the paint film, and a whole appearance part is obtained. The method fills the market gap, the surfaces of the non-polar base material parts are processed, so that the non-polar base material parts can be combined with the reaction-molding polyurethane material, and the problem that the non-polar base material cannot be in-mold painted is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of painting on interior and exterior trim parts, and particularly relates to an in-mold painting method based on a non-polar substrate, an in-mold painting device and an appearance part. BACKGROUND

[0002] In the manufacture of automobile appearance parts, it is usually necessary to use a spraying process for production operation, but the spraying process is relatively cumbersome in operation, and not only pollutes seriously, consumes greatly and has high cost. With the development of technology, a process that can replace the spraying process has appeared in the market, i.e. the in-mold painting process. This process is similar to the two-color injection molding process, for example, the injection molding method for molding mechanical interlocking between molded parts disclosed in CN101479090A, which can be used to manufacture multi-component plastic molded parts and appearance parts. As disclosed in CN101394981B, an integrated system device for manufacturing a composite, typically, in a first process, a base part is manufactured from a first component in a first cavity; then a second component is injected onto the base part in a second cavity to obtain a paint film; and after cooling and ejection, an appearance part with a paint spraying effect is obtained. Various components can be composed of different thermoplastic plastics and can also have different colors if necessary. Similarly, some components can be added with fillers. PUR components can also be used instead of thermoplastic plastics, and it is also known that multi-component plastic molded parts are manufactured from thermoplastic components and PUR components, such as the method and device for manufacturing multi-component plastic molded parts disclosed in CN101400498B, which uses a rotary table technology to place two sets of identical core devices on the rotary table. During production, one parting surface always manufactures a base part, and the other parting surface manufactures a paint film, maintaining continuous production. However, the first mold may need to be removed or opened for a long time to clean the processing agent such as release agent. In order to realize the automatic cleaning process on the device and reduce the operation process of removing the parts, CN101400498B solves the automatic cleaning process by adding a mechanical arm. On the other hand, this patent uses a sliding support table (the upper part of the support table is a rotary table) to realize the in-mold painting process with a single injection molding machine, but the sliding process increases the production time and destroys the production continuity, and cannot realize the process of opening each set of molds separately.

[0003] In addition, all the above production processes only provide solutions to the production and equipment of the multi-component in-mold painting of the polar substrate (only PC and PC / ABS, etc. PC materials are actually produced in the market). For the processing process, only the process of removing ash, cleaning or painting (CN101400498B) is used, and no solution to the production method and equipment of in-mold painting of non-polar substrate is proposed. The main reason is that there is no in-mold painting method and equipment based on non-polar substrate in the market, which cannot be used for the production of automobile appearance parts. Secondly, in the existing technology, the non-polar substrate is removed and then subjected to a separate complex treatment process, which cannot be used for continuous and automatic surface treatment of multiple non-polar substrates. Finally, the polyurethane paint for in-mold painting cannot be combined with the non-polar substrate, resulting in that the in-mold painting process of the non-polar substrate cannot be applied to the production process of the appearance part. SUMMARY

[0004] The purpose of the present application is to provide a non-polar substrate-based in-mold painting method, equipment and appearance part, which on the one hand solves the technical defects of the prior art that there is no solution to the production method and equipment of non-polar substrate in-mold appearance part painting; on the other hand, solves the technical defects that the polyurethane paint for in-mold painting cannot be combined with the non-polar substrate, resulting in that the in-mold painting process of the non-polar substrate cannot be used for the production of the appearance part.

[0005] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0006] In a first aspect, a non-polar substrate-based in-mold painting method is provided, comprising:

[0007] Simultaneously injecting a thermoplastic material into the first cavity and injecting a reaction molding polyurethane material into the second cavity to obtain a non-polar substrate part and a paint film, respectively;

[0008] The plurality of fixed cores are sequentially matched with the first cavity, so that each fixed core has a non-polar substrate part thereon;

[0009] The surface of each non-polar substrate part on the fixed core is sequentially treated, and each non-polar substrate part after surface treatment is combined with the paint film to obtain an overall appearance part.

[0010] Further, the surface of each non-polar substrate part on the fixed core is sequentially treated, and the surface of each non-polar substrate part after surface treatment is combined with the paint film to obtain an overall appearance part.

[0011] The surface of the non-polar substrate is treated to make the surface of the non-polar substrate contain a polar group, or to increase the surface tension of the non-polar substrate.

[0012] Further, the surface of the non-polar substrate is treated by flame treatment, spraying treatment agent, corona or plasma.

[0013] Further, the non-polar substrate is a non-polar material with low or no polarity on the surface.

[0014] Further, the non-polar material is polystyrene, polypropylene or polyethylene material.

[0015] In the second aspect, an in-mold painting device based on a non-polar substrate is provided, which comprises a double injection molding machine device, an intermediate rotating device, a surface treatment device and a taking device, the intermediate rotating device is arranged in the middle of the double injection molding machine device, and the surface treatment device and the taking device are arranged on both sides of the double injection molding machine device; wherein the surface treatment device is used for treating the surface of the non-polar substrate part on each fixed core, so that the non-polar substrate part after treatment is combined with a paint film to obtain an overall appearance part; and the taking device is used for grabbing the appearance part.

[0016] Further, the intermediate rotating device comprises a bottom plate, a rotating disc is rotatably connected to the bottom plate, a core support is mounted on the top of the rotating disc, and the rotating disc is used for rotating the core support around the bottom plate by 360 degrees in the axial direction.

[0017] The core support is of a rectangular structure, and a fixed core is detachably connected around the core support.

[0018] Further, the double injection molding machine device comprises an injection assembly and a painting assembly, and the injection assembly and the painting assembly are arranged at both ends of the intermediate rotating device.

[0019] Further, the injection assembly comprises a first movable cavity fixing plate and a first injection unit, and the first movable cavity fixing plate is movably connected with the first injection unit.

[0020] The painting assembly comprises a second movable cavity fixing plate and a second injection unit, and the second movable cavity fixing plate cooperates with the second injection unit.

[0021] In the third aspect, an appearance part is provided, which comprises an interior part and an exterior part, and the interior part and the exterior part are painted by the method as described above.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1. The application provides a method for in-mold painting based on non-polar substrates, which solves the technical defects of the prior art and fills the market gap. Secondly, when using the method for in-mold painting, first, the non-polar substrate and the paint film are obtained, and then the surface of the non-polar substrate is treated, so that the non-polar substrate can be combined with the reaction-formed polyurethane material (paint film), solving the problem of in-mold painting of non-polar substrates.

[0024] 2. Non-polar substrates have poor adhesion due to the weak dispersion force on their surface, lack of orientation force and induction force. By treating the surface of the non-polar substrate by flame, corona, treating agent or plasma, the surface of the non-polar substrate is oxidized, so that polar groups are formed on the surface of the substrate, which can significantly improve the adhesion or tension of the substrate, thereby realizing the combination of non-polar substrates and reaction-formed polyurethane paint, solving the technical defects that traditional production processes must take non-polar substrates to a separate workshop for flame or adhesive or treating agent treatment, and cannot be combined with injection molding machine for one-step process production. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0026] Figure 1 The method flow chart for in-mold painting based on non-polar substrates provided by the application;

[0027] Figures 2-8 The preparation stage flow chart for in-mold painting based on non-polar substrates provided by the application;

[0028] Figure 9 The initial state diagram of the in-mold painting equipment based on non-polar substrates provided by the application;

[0029] Figure 10 The in-mold painting equipment based on non-polar substrates provided by the application is shown in the process of injection molding, treatment, painting and taking;

[0030] Figure 11 The in-mold painting equipment based on non-polar substrates provided by the application is shown in the process of injection molding, treatment, painting and taking;

[0031] Figure 12 The in-mold painting equipment based on non-polar substrates provided by the application is shown in the process of injection molding, treatment, painting and taking;

[0032] Figure 13 The intermediate rotating device in the non-polar substrate based in-mold painting equipment provided by the present application returns to the initial state schematic diagram;

[0033] Figure 14 The intermediate rotating device in the non-polar substrate based in-mold painting equipment provided by the present application returns to the initial state schematic diagram;

[0034] Figure 15 The intermediate rotating device in the non-polar substrate based in-mold painting equipment provided by the present application returns to the initial state schematic diagram;

[0035] 1, the first movable cavity fixed plate; 2, the first injection unit; 3, movable cavity A1; 4, the second movable cavity fixed plate; 5, the second injection unit; 6, the PUR metering device; 7, movable cavity A2; 8, the base plate; 9, the turntable; 10, the core support; 11, the fixed core B1; 12, the fixed core B2; 13, the fixed core B3; 14, the fixed core B4; 15, the first robot; 16, the processing unit; 17, the second robot; 18, the grabbing unit. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0038] It should be noted that: similar numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0039] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product of the present application when it is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0040] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0041] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the manufacture of automotive appearance parts, it is often necessary to use a spraying process for production operations, but the spraying process is more cumbersome in the process of application, not only serious pollution, great energy consumption, and high cost. With the development of technology, a process that can replace the spraying process has appeared in the market - the in-mold painting process, which is similar to the two-color injection molding process, such as the injection molding method for molding mechanical interlocking between molded parts disclosed in CN101479090A, which can be used to manufacture multi-component plastic parts as well as appearance parts. As disclosed in CN101394981B, an integrated system device for manufacturing a composite, typically in a first process, a base material part is manufactured from a first component in a first cavity; then a second component is injected onto the base material in a second cavity to obtain a paint film; after cooling and ejection, an appearance part with a spray paint effect is obtained. Various components can be composed of different thermoplastic plastics and can also have different colors if necessary. Similarly, some components can be added with fillers. PUR components can also be used instead of thermoplastic plastics, and it is also known to manufacture multi-component plastic parts from thermoplastic components and PUR components, such as CN101400498B, a method and apparatus for manufacturing multi-component plastic parts, by means of a rotary table technology, two sets of identical core devices are placed on the rotary table, and during production, one parting surface always manufactures a base material part, and the other parting surface manufactures a paint film, maintaining continuous production. However, the first mold may need to be removed or opened for a long time to clean the processing agent such as release agent, in order to realize the automatic cleaning process on the equipment, thereby reducing the operation process of removing parts, CN101400498B solves the automatic cleaning process by adding a mechanical arm. On the other hand, this patent uses a sliding support table (the support table above is a rotating rotary table) to realize the in-mold painting process with a single injection molding machine, but the sliding process increases the production time and destroys the production continuity, and cannot realize the process of opening each set of molds separately, and the sliding process cannot stop, so cleaning and other processing work cannot be carried out.

[0043] Furthermore, all the above production processes only provide the production and equipment of solving the in-mold painting multi-component parts of the polar substrate (only the actual production process of PC and PC / ABS, etc. PC materials). For the treatment process, only the process of removing ash, cleaning or painting (CN101400498B) is used, and there is no solution to the production method and equipment of in-mold painting of non-polar substrate. The fundamental reason is that there is no in-mold painting method and equipment based on non-polar substrate on the market, which cannot be used for the production of automobile appearance parts. Secondly, in the treatment of the surface of the non-polar substrate, the non-polar substrate needs to be removed, and then a separate complex treatment process is carried out, which cannot be used for continuous and automatic surface treatment of multiple non-polar substrates. Finally, the polyurethane paint of in-mold painting cannot be combined with the non-polar substrate, which leads to the fact that the in-mold painting process of non-polar substrate cannot be applied to the production link of appearance parts.

[0044] In order to solve the above technical defects, the inventors provide an in-mold painting method, equipment and appearance part based on non-polar substrate.

[0045] The application will be described in further detail below with reference to the drawings:

[0046] In a first aspect, the embodiments of the application provide an in-mold painting method based on non-polar substrate, as shown in Figure 1

[0047] S101, while injecting a thermoplastic material into the first cavity, injecting a reaction molding polyurethane material into the second cavity, respectively obtaining a non-polar substrate part and a paint film. Exemplarily, first, as shown in Figures 2-8 the entire painting process includes a preparation stage and a production stage; in the preparation stage, the movable cavity A1 3 corresponds to the fixed core B3 13, and the movable cavity A2 7 corresponds to the fixed core B1 11, as shown in Figure 2 secondly, under the driving of the first movable cavity fixing plate 1, the movable cavity A1 3 and the fixed core B3 13 are combined, and the first injection unit 2 injects a non-polar thermoplastic material (such as PP material), as shown in Figure 3 then, the mold is opened, and the non-polar substrate is left on the fixed core B3 13, as shown in Figure 4 then, the turntable 9 drives the core support 10 to rotate counterclockwise by ninety degrees, as shown in Figure 5 so that the fixed core B2 12 on the core support 10 is rotated to the position axially coinciding with the movable cavity A1 3, as shown in Figure 6 then, the movable cavity A1 3 and the fixed core B2 12 are combined, as shown in Figure 7 ​As shown, the fixed core B3 13 rotates to a position below the processing unit 16. At this time, there is no non-polar substrate on the fixed cavity B4 14. When the fixed core B4 14 rotates to axially coincide with the movable cavity A2 7, the mold does not close. Subsequently, a non-polar substrate is obtained on the fixed core B2 12. The non-polar substrate of the fixed core B3 13 undergoes surface treatment through the processing unit 16. The fixed core B1 11 rotates to a position axially coincident with the fixed core B3 13 and is located below the gripping unit 18. Figure 7 As shown; since there is no non-polar substrate on the fixed core B111, the gripping unit 18 does not start working; subsequently, the movable cavity A13 and the fixed core B212 open the mold, as shown. Figure 8 As shown; turntable 9 rotates 90°, then, as... Figure 9 As shown, the fixed core B1 11 rotates to a position axially aligned with the movable cavity A1 3, the fixed core B2 12 is located below the processing unit 16, the fixed core B3 13 is axially aligned with the movable cavity A2 7, and the fixed core B4 14 is located below the gripping unit 18.

[0048] In the initial stage, such as Figure 9 and Figure 10 As shown, at this time, the first movable cavity fixing plate 1 and the second movable cavity fixing plate 4 respectively drive the movable cavity A1 3 and the movable cavity B3 13 to move closer to the core support 10, so that the movable cavity A1 3 and the fixed core B1 11 close the mold to form the first cavity A1+B1; the movable cavity B3 13 and the movable cavity A2 7 close the mold to form the second cavity A2+B3. Then, while the first injection unit 2 injects thermoplastic material into the first cavity A1+B1, the second injection unit 5 injects reaction molding polyurethane material (A material + B material) into the second cavity A2+B3 and waits for curing. The fixed core B1 11 becomes a non-polar substrate, and the fixed core B3 13 becomes a paint film.

[0049] S102. Multiple fixed cores are sequentially fitted into the first cavity, such that each fixed core has one of the non-polar substrate components. For example, while fixed core B1 11 obtains a non-polar substrate and fixed core B3 13 obtains a paint film, processing unit 16 processes the surface of the non-polar substrate on fixed core B2 12. Since there is no non-polar substrate on fixed core B4 14, the gripping unit 18 located on fixed core B4 14 is not activated. Figure 11 , Figure 12 and Figure 13As shown, the fixed core B4 14 is rotated to be axially coincident with the movable cavity A1 3, the fixed core B2 12 is axially coincident with the movable cavity A2 7, the first movable cavity fixed plate 1 and the second movable cavity fixed plate 4 drive the movable cavity A1 3 and the movable cavity A2 7 to move towards the core support 10, the first injection unit 2 injects the thermoplastic material into the fixed core B4 14, and after solidification, the fixed core B4 14 obtains a non-polar substrate; the second injection unit 5 injects the reaction-formed polyurethane material (A material + B material) into the fixed core B2 12, and the non-polar substrate on the fixed core B2 12 obtains a paint film; at this time, as shown, Figure 14 As shown, the fixed core B4 14 has a non-polar substrate being injected, the fixed core B1 11 has a non-polar substrate being surface treated, the non-polar substrate on the fixed core B2 12 is combined with the reaction-formed polyurethane material (A material + B material) to be painted, and the fixed core B3 13 has a completely cooled in-mold painted overall appearance piece. When the appearance piece on the fixed core B3 13 is rotated to be below the grabbing unit 18, the appearance piece on the fixed core B3 13 is grabbed by the grabbing unit 18, and then the fixed core B3 13 returns to the state without the piece.

[0050] S103, the surface of each non-polar substrate on the fixed core is treated in turn, and each non-polar substrate after surface treatment is combined with the paint film to obtain an overall appearance piece. Exemplarily, with continuous circulation in the opening and closing processes, the surface of the non-polar substrate on each fixed core can be treated in turn. During the treatment, the surface of the non-polar substrate contains polar groups, or the surface tension of the non-polar substrate is increased, so that the treated non-polar substrate can be combined with the reaction-formed polyurethane material, that is, with the paint film, thereby obtaining the appearance piece. During the surface treatment of the non-polar substrate, flame treatment, spraying of treatment agent, corona or plasma can be used. Since the non-polar substrate is a non-polar material, specifically polystyrene, polypropylene or polyethylene material, the surface of the non-polar substrate can contain polar groups or tension by flame treatment, spraying of treatment agent, corona or plasma. The specific treatment method can be selected according to the specific operation condition, which is not limited herein. When the flame treatment is used, the flame width is 200 mm, the scanning speed is 650 mm / s, and the surface can be scanned twice quickly.

[0051] When the method is used for in-mold painting of non-polar substrates, the first cavity A1+B1 and the second cavity A2+B3 are not necessarily opened at the same time, and the mold is opened according to the injection cooling of the substrate in the first cavity A1+B1 and the injection and curing of the paint film in the second cavity A2+B3, respectively. After both the first cavity A1+B1 and the second cavity A2+B3 are opened, the intermediate rotating device is rotated. Compared with the rotating table technology mentioned in the background art, the bottom plate in the intermediate rotating device is fixed and will not slide, and the opening of one type of cavity will not affect the opening of another type of cavity, and the distribution can be realized. At the same time of closing the mold, the corresponding processing and grabbing process has already started, and since the processing and grabbing time is short, all processes are completed before the first cavity A1+B1 and the second cavity A2+B3 are opened, and the overall final display time is the processing time of the slowest first cavity A1+B1 and the second cavity A2+B3. The overall process of injection, processing, painting and grabbing is completed in the same time, which not only solves the technical defects of the prior art and fills the market gap, but also greatly improves the production efficiency. For example, the time required for closing and opening the first cavity A1+B1 is 100s, the time required for closing and opening the second cavity A2+B3 is 120s, the processing time is 10s, and the grabbing time is 10s. The overall processing time is 120s, which is half or even more than the original processing time (100+120+10+10=240s), and the single-piece cycle processing time has obvious advantages. In addition, when the method is used for in-mold painting, the surfaces of multiple non-polar substrates can be continuously and automatically processed, improving the processing efficiency. Finally, the method processes the surface of the non-polar substrate, so that the non-polar substrate can be combined with the reaction-formed polyurethane material (A material+B material), solving the problem of in-mold painting of non-polar substrates. In the method, the overall area of the movable cavity A1 3 is larger than the area of the movable cavity A2 7, and the non-polar substrate is a non-polar material with low polarity or no polarity.

[0052] In a second aspect, an in-mold painting device based on non-polar substrates is provided, as shown in Figures 9-15 The device includes a double injection molding machine device, an intermediate rotating device, a surface treatment device, a taking device, and a control device. The intermediate rotating device is arranged in the middle of the double injection molding machine device, the surface treatment device and the taking device are arranged on both sides of the double injection molding machine device, and the control device is electrically connected with the double injection molding machine device, the intermediate rotating device, the surface treatment device, and the taking device. The surface treatment device is used to treat the surface of the non-polar substrate on each fixed core, so that the treated non-polar substrate is combined with the paint film to obtain an overall appearance part. The taking device is used to grab the appearance part. In the embodiment, as shown in Figure 15As shown, the intermediate rotating device comprises a bottom plate 8, a rotating disc 9 is rotatably connected to the bottom plate 8, a core support 10 is installed on the top of the rotating disc 9, and the rotating disc 9 is used to rotate the core support 10 axially by 360 degrees around the bottom plate 8; the core support 10 adopts a rectangular structure, and a fixed core is detachably connected to the four sides of the core support 10. Since there are four fixed cores rotating on the core support 10, the surface of the core can be designed in multiple ways, and appearance parts with the same surface and different back structures can be obtained, thereby meeting different operation requirements or design conditions of unified appearance parts but different installation structures, and reducing equipment or mold development and cost. For example, the above-mentioned conditions can complete the design of appearance part structures with four different backs, only one set of equipment and six sets of mold halves are needed, and four sets of equipment and eight sets of mold halves are needed in the traditional way. The painting equipment meets the modular design requirements of automobile part painting.

[0053] The double-injection-molding-machine device comprises an injection molding assembly and a painting assembly, the injection molding assembly and the painting assembly are arranged at two ends of the intermediate rotating device, the injection molding assembly comprises a first movable cavity fixing plate 1 and a first injection unit 2, and the first movable cavity fixing plate 1 is movably connected with the first injection unit 2; the painting assembly comprises a second movable cavity fixing plate 4 and a second injection unit 5, the second movable cavity fixing plate 4 is matched with the second injection unit 5, and the second injection unit 5 is provided with a PUR metering device 6. It is worth noting that the movable cavity A1 is connected with a normal injection system of an injection molding machine, and the movable cavity A2 is connected with a reaction molding RIM system, and a glue inlet is arranged on the RIM system, and the gate is preferably arranged vertically.

[0054] In this embodiment, unlike the injection molding machine mentioned in the background art, the injection molding assembly and the painting assembly of the device can simultaneously perform operations or can perform operations individually.

[0055] In this embodiment, the first robot 15 and the second robot 17 are both six-axis robots, and the grabbing unit 18 mainly grabs the gate or overflow groove part of the appearance part, so that the part taking process without damaging the surface state of the appearance part can be realized without the need for a stripper, and the complex structure design of the core can be reduced.

[0056] In addition, in the implementation process, a plurality of first robots 15 can be arranged beside the first robot 15, and different types of processing units 16 can be assembled on each first robot 15, so that the problem of frequent disassembly and replacement of the processing unit 16 when performing different non-polar substrate surface treatments can be avoided, and the operation time can be saved.

[0057] Compared with general in-mold painting products, the device has no requirement for the polarity of the substrate, and both polar and non-polar materials can be processed by using the device and method, thereby greatly expanding the use range of the substrate.

[0058] In a third aspect, there is provided an appearance part, which includes an interior trim part and an exterior trim part, such as a decorative strip, a door panel, a cowling, a tail fin, and the like, both of which are painted by using the method and the apparatus as described above.

[0059] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit the scope of protection, and although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the skilled person in the art can make various changes, modifications or equivalent replacements to the specific embodiments of the present application after reading the present application, but these changes, modifications or equivalent replacements are all within the scope of protection of the claims to be filed.

Claims

1. A non-polar substrate based in-mold painting method, characterized by, The application relates to a double-injection-molding device and a method for manufacturing an overall appearance piece. The method comprises the following steps: simultaneously injecting a thermoplastic material into a first cavity and a reaction-molding polyurethane material into a second cavity to obtain a non-polar base material piece and a paint film respectively; a plurality of fixed cores are sequentially matched with the first cavity, and each fixed core has one non-polar base material piece; the surfaces of the non-polar base material pieces on each fixed core are sequentially treated, and the treated non-polar base material pieces are combined with the paint film to obtain an overall appearance piece. The double-injection-molding device comprises a double-injection-molding device, an intermediate rotating device, a surface treatment device and a piece taking device. The intermediate rotating device is arranged in the middle of the double-injection-molding device, and the surface treatment device and the piece taking device are arranged on the two sides of the double-injection-molding device. The surface treatment device is used for treating the surfaces of the non-polar base material pieces on each fixed core to combine the treated non-polar base material pieces with the paint film to obtain an overall appearance piece. The piece taking device is used for grabbing the appearance piece.

2. The method of claim 1, wherein, The intermediate rotating device comprises a bottom plate (8), a rotating disc (9) rotatably connected to the bottom plate (8), and a core support (10) arranged on the top of the rotating disc (9). The core support (10) is a rectangular structure, and a fixed core is detachably connected to the periphery of the core support (10).

3. The method of claim 2, wherein, The surfaces of the non-polar base material pieces on each fixed core are sequentially treated.

4. The method according to any one of claims 1 to 3, characterized in that, The surfaces of the non-polar base material pieces are treated to contain polar groups or to improve the surface tension of the non-polar base material pieces.

5. The method of claim 4, wherein, The surfaces of the non-polar base material pieces are treated by means of flame treatment, spraying of a treatment agent, corona or plasma.

6. The method of claim 1, wherein, The non-polar base material piece is a non-polar material.

7. The method of claim 6, wherein, The non-polar material is a polystyrene, polypropylene or polyethylene material. The double-injection-molding device comprises an injection assembly and a paint application assembly. The injection assembly comprises a first movable cavity fixing plate (1) and a first injection unit (2). The paint application assembly comprises a second movable cavity fixing plate (4) and a second injection unit (5).

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