Plastic product processing technology and auxiliary tool

Abstract

The invention discloses a plastic product processing technology and an auxiliary tool, and relates to the technical field of plastic products, the plastic product processing technology comprises the following steps: an injection mold is provided, and a cavity of the injection mold is provided with a smooth surface area and a rough surface area; a first workpiece is formed in the injection mold, a highlight area is formed in the position, corresponding to the smooth area of the cavity, of the outer surface of the first workpiece, and a matte area is formed in the position, corresponding to the rough surface of the cavity, of the outer surface of the first workpiece; an auxiliary tool is arranged outside the first workpiece in a covering mode so as to shield a matte area of the first workpiece; and the first workpiece provided with the auxiliary tool is sprayed, so that the highlight area of the first workpiece is covered with a coating, and a finished workpiece is obtained. According to the processing technology, the matte area does not make contact with the finish paint all the time, so that the original color and state can be kept, the highlight area can still be protected, the problem of matte pattern distortion in an existing processing technology is solved, and the quality of a finished product is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic products, and in particular to a plastic product processing technology and auxiliary tooling. Background Art

[0002] Some plastic products require a coexistence of high gloss and matte patterns after processing. The existing processing technology is to spray paint on the plastic parts and then perform laser engraving on the painted surface. However, since the paint itself has a certain degree of light transmittance, the color of the matte pattern surface will change after laser engraving, causing distortion. Summary of the invention

[0003] The main purpose of the present invention is to propose a plastic product processing technology and auxiliary tooling, aiming to adjust the processing technology of plastic parts to avoid the erosion of the matte pattern surface by paint, thereby ensuring that the matte pattern surface can be clearly presented on the product surface.

[0004] To achieve the above object, the plastic product processing technology proposed by the present invention comprises the following steps:

[0005] Providing an injection mold, wherein the cavity of the injection mold has a smooth surface area and a rough surface area;

[0006] Molding a first workpiece in the injection mold, wherein the outer surface of the first workpiece forms a highlight area corresponding to the glossy area of ​​the cavity, and forms a matte area corresponding to the rough surface of the cavity;

[0007] Setting an auxiliary tooling cover outside the first workpiece to shield the matte area of ​​the first workpiece;

[0008] The first workpiece installed with the auxiliary tooling is sprayed so that the highlight area of ​​the first workpiece is covered with a coating, thereby obtaining a finished workpiece.

[0009] In one embodiment, in the step of providing an injection mold, the cavity of the injection mold is processed by a texturing process to obtain a rough surface area.

[0010] In one embodiment, in the step of molding the first workpiece in the injection mold, wherein the outer surface of the first workpiece forms a highlight area corresponding to the glossy area of ​​the cavity, and forms a matte area corresponding to the rough surface of the cavity, one end of the first workpiece forms the matte area, the other end forms the highlight area, and the middle of the first workpiece forms a connection area;

[0011] The step of arranging the auxiliary tooling cover outside the first workpiece to shield the matte area of ​​the first workpiece includes:

[0012] The auxiliary tooling is sleeved on the outside of the first workpiece to simultaneously shield the matte area at one end of the first workpiece and the connecting area in the middle of the first workpiece, so that the highlight area at the other end of the first workpiece is exposed to the outside.

[0013] In one embodiment, the step of spraying the first workpiece with the auxiliary tooling installed thereon so that the highlight area of ​​the first workpiece is covered with a coating to obtain a finished workpiece includes:

[0014] Transferring the first workpiece equipped with the auxiliary tooling to a spraying station;

[0015] Spraying light-curing paint on the top surface and the surrounding side surface of the first workpiece on which the auxiliary tooling is installed by a spraying jig, so as to form a coating on the exposed highlight area of ​​the first workpiece;

[0016] The auxiliary tooling is removed to obtain a finished workpiece.

[0017] The present invention also proposes an auxiliary tooling for use as an auxiliary tooling in the above-mentioned plastic product processing technology, characterized in that the auxiliary tooling includes a shell, one side of the shell is open, and the shell is used to be sleeved on the outside of the workpiece to cover the matte area of ​​the workpiece.

[0018] In one embodiment, at least a portion of the inner wall surface of the housing is arranged in a curved surface; and / or,

[0019] The shell is flexibly configured.

[0020] In one embodiment, the auxiliary tool further includes a gripping portion, and the gripping portion is disposed outside the shell and located on a side of the shell that is away from the open side thereof.

[0021] In one embodiment, the shell and the grip portion are integrally formed.

[0022] In one embodiment, the wall surface of the inner cavity of the shell close to the open side of the shell is arranged in a stepped manner to form a step surface facing away from the open side, and the step surface is used to press against the concave surface of the workpiece.

[0023] In one embodiment, a portion of the outer wall of the shell close to the open side of the shell is recessed to form an annular avoidance groove, and the annular avoidance groove is arranged to penetrate the side wall of the open side of the shell.

[0024] In the technical solution of the present invention, the product is first prefabricated by an injection mold. Due to the cavity design of the injection mold, the outer surface of the first workpiece obtained by processing has formed a highlight area and a matte area, that is, the appearance requirement of the simultaneous existence of highlight and matte patterns on the surface of the product has been met. On this basis, the matte area of ​​the first workpiece is shielded by auxiliary tooling, so that during spraying, the topcoat can only fall on the exposed external surface of the first workpiece, thereby forming a coating on its highlight area. In this processing technology, the matte area is always not in contact with the topcoat, so that the original color and state can be maintained, and the highlight area can still be protected, thereby solving the problem of matte pattern distortion in the existing processing technology and improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a process flow of an embodiment of a plastic product processing process provided by the present invention;

[0027] Figure 2 A schematic diagram of the structure of the plastic part provided by the present invention;

[0028] Figure 3 A schematic structural diagram of an auxiliary tooling embodiment provided by the present invention;

[0029] Figure 4 for Figure 3 A schematic diagram of the structure of the auxiliary tooling and the plastic parts;

[0030] Figure 5 for Figure 4 A partial schematic diagram of the auxiliary tooling cooperating with the plastic parts.

[0031] Description of Figure Numbers:

[0032] 1. Auxiliary tooling; 11. Shell; 111. Step surface; 112. Annular avoidance groove; 12. Grip; 2. Workpiece; 21. High light area; 22. Matt area; 23. Connection area.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0035] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0036] The main solution of this application is: by adjusting the processing technology of plastic parts and matching auxiliary tooling, the surface of the finished plastic parts can have both high gloss and matte patterns, and the matte pattern is clearly visible.

[0037] The existing plastic parts processing technology first obtains plastic parts through injection molding, then sprays primer on the surface of the plastic parts, and then performs laser engraving on the paint surface of the primer, using a dedicated laser engraving machine and a special wavelength, with a specific frequency and pulse for precise laser engraving. After laser engraving, the topcoat is sprayed. The topcoat is to protect the high-gloss surface, but the topcoat is light-transmissive, which will cause the laser engraved pattern to change color. At the same time, it will cause corrosion to the matte pattern, resulting in the defect of the pattern surface being flowery, and the matte effect being deteriorated, resulting in the distortion of the pattern surface laser engraving, which cannot meet the processing requirements of the product.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Please refer to the figure, the auxiliary tooling 1 includes a shell 11, one side of which is open, and the shell 11 is used to be sleeved on the outside of the workpiece to cover the matte area of ​​the workpiece. The auxiliary tooling 1 has the effect of covering the matte area of ​​the workpiece, so that when the topcoat is sprayed, the topcoat can be prevented from contacting the matte area of ​​the product, thereby protecting the matte pattern of the product and preventing the matte area from being corroded by the topcoat and causing distortion.

[0041] Furthermore, the shell is flexibly configured, so that the shell 11 made of a flexible material can be deformed when matched with the workpiece and has a certain elastic adaptation amount. The present invention does not limit the material of the shell 11, and the shell 11 can be made of soft rubber or silicone.

[0042] Specifically, the shape of the housing 11 can be adapted according to the shape of the workpiece, and at least part of the inner wall of the housing 11 can be set as a curved surface. The housing 11 can also be set to be square or hemispherical, or other irregular shapes to adapt to a part of the workpiece.

[0043] It should be noted that the auxiliary tooling 1 is mainly used to partially shield the workpiece during the spraying process to achieve the effect of spraying protection. Therefore, its application scenario is not limited to plastic product processing. According to usage requirements, the auxiliary tooling 1 can also be used as a shielding jig in other usage scenarios, and the present invention does not limit this.

[0044] The auxiliary tooling 1 needs to be sleeved on the surface of the workpiece before the workpiece is sprayed to cover the matte area of ​​the workpiece. After the spraying is completed, the auxiliary tooling 1 needs to be removed so that the finished workpiece is exposed to the outside for easy picking. In view of this, the auxiliary tooling 1 also includes a gripping portion 12, which is arranged on the outside of the shell 11 and is located on the side of the shell 11 facing away from its open side. For example, the lower end of the shell 11 is open and cooperates with the workpiece along the up and down directions when in use. Accordingly, the gripping portion 12 is located at the upper end of the shell 11. The present invention does not limit the specific structural form of the gripping portion 12, which can be a sheet structure with a certain length for easy grasping by the operator, or a recessed area can be provided on the surface of the shell 11 to form a buckle groove for the operator's fingers to reach in and grasp. In other embodiments, a handle or rope can also be connected to the upper end of the shell 11 for the operator to hold.

[0045] Furthermore, the shell 11 and the holding portion 12 can be integrally formed to ensure that the two have good connection strength. In other embodiments, the holding portion 12 can also be assembled with the shell 11, that is, the auxiliary tooling 1 is a combination. At this time, it is necessary to ensure the tightness of the holding portion 12 and the shell 11 to avoid gaps in the connection that allow the topcoat to enter.

[0046] The present invention does not limit the shape of the workpiece. In this embodiment, the workpiece as a whole extends in the up-down direction, with a matte area formed in the upper part, a highlight area formed in the lower part, and a transition part in the middle part, which is smaller in diameter than the upper and lower parts, thereby forming a ring-shaped recessed area. In order to ensure that the shell 11 and the workpiece fit tightly, the inner cavity of the shell 11 is stepped near the wall surface of the open side of the shell 11 to form a step surface 111 facing away from the open side, and the step surface 111 is used to press against the recessed surface of the workpiece. Figure 3 For example, the open side of the shell 11 is arranged downward, and the step surface 111 is arranged upward, so that the lower end portion of the shell 11 is embedded in the annular groove of the workpiece, and the step surface 111 abuts against the recessed surface of the annular groove, thereby achieving a limiting fit effect and preventing the shell 11 from falling off.

[0047] In addition, when masking the matte area, it is also necessary to ensure that the highlight area is completely exposed to the outside. In some implementations, the outer wall of the shell 11 near the open side of the shell 11 is recessed to form an annular avoidance groove 112, and the annular avoidance groove 112 is set through the side wall of the open side of the shell 11. Thus, an avoidance space is formed, and the highlight area is completely exposed, so that the shell 11 will not cause obstruction during spraying, and the coating coverage of the highlight area is guaranteed.

[0048] It should be understood that the shape of the shell 11 and the design of the step can be reasonably adjusted according to the shape of the product to ensure that the auxiliary tooling 1 has good shielding properties and is easy to disassemble and assemble.

[0049] The housing 11 can be an integrally formed whole or two parts spliced ​​together. This is because different sizes of workpieces are different. Therefore, more workpiece specifications can be adapted through splicing. When multiple splicing parts of the main body are matched, the overlap gap cannot reveal the workpiece surface.

[0050] Based on the above auxiliary tooling 1, please refer to Figure 5 The present invention provides a plastic product processing technology, which specifically includes the following steps:

[0051] S10: providing an injection mold, wherein the cavity of the injection mold has a smooth surface area and a rough surface area;

[0052] It should be noted that in the existing laser engraving process, the outer surface of the workpiece obtained by injection mold processing is a highlight area, and the matte area is processed by laser engraving. The injection mold of the present invention designs the mold cavity so that the mold cavity itself has processed the glossy area and the rough area.

[0053] The present invention does not limit the processing method of the injection mold. In this embodiment, the cavity of the injection mold is processed by a texturing process to obtain a rough surface area. The texturing process refers to the action of etching the mother mold surface of the mold core with the required pattern by chemical etching technology. The texturing process is a process performed on the mold, while the laser engraving process is a process performed on the surface of the workpiece.

[0054] S20: forming a first workpiece in the injection mold, wherein an outer surface of the first workpiece forms a highlight area corresponding to the glossy area of ​​the cavity, and forms a matte area corresponding to the rough area of ​​the cavity;

[0055] Based on the structure of the injection mold, the product prototype obtained by injection molding directly has a highlight area and a matte area, that is, the first workpiece has met the appearance requirements of the coexistence of highlight and matte patterns.

[0056] S30: placing an auxiliary tooling 1 cover outside the first workpiece to shield the matte area of ​​the first workpiece;

[0057] The auxiliary tooling 1 is provided with a shell 11 made of a flexible material and is sleeved on the outside of the first workpiece. The material of the shell 11 can be deformed when cooperating with the workpiece and has a certain elastic adaptation amount, so that it can fit tightly with the product, cover the matte area of ​​the workpiece, and protect the matte pattern of the product.

[0058] S40: spraying the first workpiece on which the auxiliary tooling 1 is installed, so that the highlight area of ​​the first workpiece is covered with a coating, thereby obtaining a finished workpiece.

[0059] During the spraying process, the auxiliary tooling 1 can prevent the topcoat from contacting the matte area of ​​the product, thereby preventing the matte area from being corroded by the topcoat and causing distortion.

[0060] In the technical solution of the present invention, the product is first prefabricated by an injection mold. Due to the cavity design of the injection mold, the outer surface of the first workpiece obtained by processing has formed a highlight area and a matte area, that is, the appearance requirement of the simultaneous existence of highlight and matte patterns on the surface of the product has been met. On this basis, the matte area of ​​the first workpiece is shielded by an auxiliary tooling 1, so that during spraying, the topcoat can only fall on the exposed external surface of the first workpiece, thereby forming a coating on its highlight area. In this processing technology, the matte area is always not in contact with the topcoat, so that the original color and state can be maintained, and the highlight area can still be protected, thereby solving the problem of matte pattern distortion in the existing processing technology and improving the quality of the finished product.

[0061] Furthermore, when the matte area is formed at one end of the first workpiece and the highlight area is formed at the other end, a connecting area is formed in the middle of the first workpiece, and the connecting area has no obvious transition marks, that is, there is no transition area between the matte area and the highlight area formed by this scheme, and the auxiliary tooling 1 can only cover the matte area, and the highlight area is exposed to the outside.

[0062] In this embodiment, in step S30, the auxiliary tooling 1 is mounted on the outside of the first workpiece to simultaneously shield the matte area at one end of the first workpiece and the connecting area in the middle of the first workpiece, so that the highlight area at the other end of the first workpiece is exposed to the outside.

[0063] It should be noted that, during spraying, a coating is formed only on the highlight area of ​​the first workpiece, while no coating is formed on the matte area and the connecting area.

[0064] Furthermore, the present invention does not limit the processing path of the workpiece. For example, a plurality of workstations can be divided in the site for processing different process steps. In one embodiment, an injection molding station and a spraying station are set, the injection mold is at the injection molding station, and the spraying equipment is at the spraying station.

[0065] Based on the above embodiment, in steps S10-S20, raw materials are added to the injection mold at the injection molding station, and after a certain processing time, the injection mold is opened to reveal the first workpiece;

[0066] Step S40 includes:

[0067] S41: moving the first workpiece equipped with the auxiliary tooling 1 to a spraying station;

[0068] The first workpiece removed from the injection mold is transferred from the injection molding station to the spraying station by manual handling, robot handling, or conveyor belt transportation, so that it can correspond to the spraying equipment.

[0069] By arranging the injection mold and the spraying separately, the relative cleanliness of the injection space can be ensured, and the dust from the spraying can be prevented from being scattered on the surface of the first workpiece.

[0070] S42: spraying ultraviolet curing paint (UV paint) onto the top surface and the surrounding side surface of the auxiliary tooling 1 by a spraying jig to form a coating on the exposed high light area of ​​the first workpiece;

[0071] Specifically, the spraying jig can be handheld or can be a nozzle automatic spraying, and the spraying range can be from the top of the workpiece downward, so as to cover the top surface and the surrounding side of the workpiece, or the spraying jig can spray along the surrounding side of the workpiece, at which time the workpiece itself can rotate, or the spraying jig can rotate. In the above-mentioned spraying method, since the spraying is in the form of mist, it can be scattered on the top surface and the surrounding side of the auxiliary tooling 1, so that it is blocked by the auxiliary tooling 1 and will not contact the matte area of ​​the first workpiece.

[0072] S43: removing the auxiliary tooling 1 to obtain a finished workpiece.

[0073] It should be understood that this step can be completed at the spraying station or after the workpiece is moved to a designated area.

[0074] It should be noted that step S30 can be performed when the first workpiece is moved to the spraying station, or after the workpiece reaches the spraying area. It is only necessary to install the auxiliary tooling 1 before the workpiece is sprayed.

[0075] It should be noted that, during the entire process, only one auxiliary tooling 1 may be provided, that is, each product is processed separately, and after the previous product is sprayed, the auxiliary tooling 1 is removed and installed on the next product. Multiple auxiliary tooling 1 may also be provided and used alternately or simultaneously on the production line to improve the processing effect.

[0076] It should be understood that products of different specifications are processed separately through different injection molds, but can be matched with the same auxiliary tooling 1 for masking spraying. That is, during the injection molding process, due to the need to match the design of the product, the same injection mold can only process one type of product. For the auxiliary tooling 1, a universal tooling can be set to adapt to a variety of product specifications.

[0077] Furthermore, before step S30, the method further includes:

[0078] The first workpiece is removed from the injection mold and left for a preset time.

[0079] This is because the first workpiece has a certain temperature right after being removed from processing, and the auxiliary tooling 1 is easily affected by temperature and deformed due to its flexible material. In order to prevent the high-temperature first workpiece from contacting the auxiliary tooling 1 and causing the auxiliary tooling 1 to deform or melt and stick to the first workpiece, the first workpiece needs to be steeled for a period of time to restore it to room temperature before subsequent processing.

[0080] It should be noted that it can be placed directly on a turnover box or a conveyor belt, or it can be cooled by a fan during the conveying process. It should be understood that different cooling measures correspond to different preset times, and a reasonable design can be made according to the actual production environment.

[0081] The process of the present invention is as follows: first, a workpiece prototype with glossy and matte patterns, i.e., a first workpiece, is manufactured by an injection mold, and then a shielding fixture, i.e., an auxiliary tooling 1, is used to shield the matte pattern of the workpiece, and then the glossy surface is sprayed to form a protective coating on the glossy surface, thereby obtaining a product with both glossy and matte effects. This process can solve the problem of distortion of the matte effect of the product obtained by the existing process of spraying UV paint and then laser engraving patterns to form a matte effect, so that the matte part of the processed product is clearer, thereby improving the quality of the product.

[0082] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A plastic product processing technology, characterized in that: The following steps are involved: Providing an injection mold, wherein the cavity of the injection mold has a smooth surface area and a rough surface area; Molding a first workpiece in the injection mold, wherein the outer surface of the first workpiece forms a highlight area corresponding to the glossy area of ​​the cavity, and forms a matte area corresponding to the rough surface of the cavity; Setting an auxiliary tooling cover outside the first workpiece to shield the matte area of ​​the first workpiece; The first workpiece installed with the auxiliary tooling is sprayed so that the highlight area of ​​the first workpiece is covered with a coating, thereby obtaining a finished workpiece.

2. The plastic product processing process according to claim 1, characterized in that: In the step of providing an injection mold, the cavity of the injection mold is processed by a texturing process to obtain a rough surface area.

3. The plastic product processing process according to claim 1, characterized in that: In the step of molding a first workpiece in the injection mold, wherein the outer surface of the first workpiece forms a highlight area corresponding to the glossy area of ​​the cavity, and forms a matte area corresponding to the rough surface of the cavity, one end of the first workpiece forms the matte area, the other end forms the highlight area, and the middle of the first workpiece forms a connection area; The step of arranging the auxiliary tooling cover outside the first workpiece to shield the matte area of ​​the first workpiece includes: The auxiliary tooling is sleeved on the outside of the first workpiece to simultaneously shield the matte area at one end of the first workpiece and the connecting area in the middle of the first workpiece, so that the highlight area at the other end of the first workpiece is exposed to the outside.

4. The plastic product processing process according to claim 1 or 3, characterized in that: The step of spraying the first workpiece on which the auxiliary tooling is installed so that the highlight area of ​​the first workpiece is covered with a coating to obtain a finished workpiece includes: Transferring the first workpiece equipped with the auxiliary tooling to a spraying station; Spraying light-curing paint on the top surface and the surrounding side surface of the first workpiece on which the auxiliary tooling is installed by a spraying jig, so as to form a coating on the exposed highlight area of ​​the first workpiece; The auxiliary tooling is removed to obtain a finished workpiece.

5. An auxiliary tooling used as an auxiliary tooling in the plastic product processing technology according to any one of claims 1 to 4, characterized in that: The auxiliary tooling comprises a shell, one side of which is open, and the shell is used to be sleeved on the outside of the workpiece to cover the matte area of ​​the workpiece.

6. The auxiliary tooling as claimed in claim 5, characterized in that: At least part of the inner wall surface of the housing is arranged in a curved surface; and / or, The shell is flexibly configured.

7. The auxiliary tooling as claimed in claim 5, characterized in that: The auxiliary tooling also includes a gripping portion, which is arranged outside the shell and located on the side of the shell facing away from the open side thereof.

8. The auxiliary tooling according to claim 7, characterized in that: The shell and the gripping portion are integrally formed.

9. The auxiliary tooling as claimed in claim 5, characterized in that: The wall surface of the inner cavity of the shell body close to the open side of the shell body is arranged in a stepped manner to form a step surface facing away from the open side, and the step surface is used to press against the concave surface of the workpiece.

10. The auxiliary tooling according to claim 5, characterized in that: The outer wall of the shell body is partially recessed near the open side of the shell body to form an annular avoidance groove, and the annular avoidance groove is arranged to penetrate the side wall of the open side of the shell body.

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