A method for manufacturing a two-color injection molded product, the two-color product, and the mold.

Abstract

This invention discloses a manufacturing method, a two-color injection molded product, and a mold. The manufacturing method includes the following steps: designing and manufacturing a first injection mold, a molding block, and a slide block based on a closed graphic design; performing a first injection molding to obtain a first die; the first die forms a through-hole through the molding block, the through-hole matching the inner contour of the closed graphic; the first die forms a glue channel through the slide block, the glue channel communicating with the through-hole; designing and manufacturing a second injection mold based on the first die design, and placing the first die in the second injection mold; performing a second injection molding to obtain a second die; the glue of the second die enters through the glue channel and fills the through-hole; the second die and the first die cooperate to form the product; and controlling the second injection mold to eject the product. This method can improve the structural tightness of the product while enhancing the aesthetic appearance of the two-color injection molded product.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a method for manufacturing two-color injection molded products, two-color products, and molds. Background Technology

[0002] Existing two-color injection molded products typically involve injecting a second ingot onto the surface of the first ingot after it has been completed. When the first ingot contains closed characters, the glue in the second ingot is difficult to flow and fill the internal hollow areas of the closed characters. The closed characters in the first ingot will directly retain the hollow structure in the center, resulting in a product with an incomplete structure and poor visual appearance. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the first aspect of the present invention proposes a method for manufacturing a two-color injection molded product, which enables the second injection of adhesive to flow and fill the interior of the closed character, effectively improving the structural tightness and aesthetic appearance of the two-color injection molded product.

[0004] A second aspect of the present invention also provides a two-color product manufactured using the above-described method for manufacturing two-color injection molded products.

[0005] A third aspect of the present invention also provides a mold for the manufacturing method of the above-mentioned two-color injection molded products.

[0006] A method for manufacturing a two-color injection molded product according to a first aspect of the present invention includes the following steps: designing and manufacturing a first injection mold, a molding block, and a slide block according to a closed graphic design, wherein the slide block and the molding block abut against each other; performing a first injection molding to obtain a first die, wherein the first die forms a through hole through the molding block, the through hole matching the inner contour of the closed graphic, and the first die forms a glue channel through the slide block, wherein the glue channel and the through hole are connected; designing and manufacturing a second injection mold according to the first die, and placing the first die in the second injection mold; performing a second injection molding to obtain a second die, wherein the glue of the second die enters through the glue channel and fills the through hole, and the second die and the first die cooperate to form a product; and controlling the second injection mold to eject the product.

[0007] According to an embodiment of the present invention, a method for manufacturing a two-color injection molded product has at least the following beneficial effects: Before injection molding the product, based on the closed shape of the product, molding blocks and slides can be designed in the mold, thereby forming a general closed shape on the first die obtained from the first injection molding. The inner contour of the closed shape is a through hole, which is connected to the outside through a glue channel. Then, a second injection molding is performed, and the glue liquid of the second injection molding enters through the glue channel and fills the through hole, so that the second die of the second injection molding partially fills the inner contour of the closed shape of the first die. This improves the bonding between the first and second dies and enhances the tightness of the product structure, while also making the inner and outer parts of the closed shape different colors, making the closed shape clearer and more aesthetically pleasing, and effectively improving the appearance of the two-color injection molded product.

[0008] According to some embodiments of the present invention, the steps of designing and manufacturing a first injection mold, a molding block, and a slide according to a closed graphic include: preparing a fixed mold and a first moving mold; setting a first groove on the first moving mold according to the outer contour of the closed graphic; setting the molding block in the first groove according to the inner contour of the closed graphic; and designing and manufacturing a slide according to the molding block.

[0009] According to some embodiments of the present invention, the step of designing and manufacturing a slide according to the molding block includes: installing a slanted ejector on the first moving mold, the slanted ejector and the first moving mold being slidably fitted; installing the slide on the slanted ejector, the slide extending toward the first groove and located below the molding block, wherein when the first moving mold and the fixed mold are closed, the end of the slide abuts against the molding block, and when the first moving mold and the fixed mold are opened, the slanted ejector drives the slide to disengage from the glue channel.

[0010] According to some embodiments of the present invention, the step of designing and manufacturing a second injection mold based on the first die includes: preparing a second moving mold; setting a second groove on the second moving mold according to the outer contour of the first die; setting a graphic block in the second groove according to the top surface contour of the first die; forming a second cavity between the graphic block, the first die, and the groove wall of the second groove; the second cavity is used to form the second die; the second die forms a graphic hole through the graphic block; the graphic hole matches the shape of the closed graphic and is located above the first die.

[0011] According to some embodiments of the present invention, the ends of the row positions are provided with rounded corners.

[0012] According to a second aspect of the present invention, a two-color product includes a first and a second ingot manufactured by the manufacturing method of the two-color injection molded product described in the above embodiments.

[0013] According to some embodiments of the present invention, the first die has a glue channel, the first die has a graphic protrusion, the graphic protrusion has a through hole, the through hole is located above the glue channel and communicates with the glue channel, the second die has a filling part, the glue channel and the filling part are engaged, the filling part has a central part, the central part and the through hole are engaged.

[0014] According to some embodiments of the present invention, the second die has a flange portion that protrudes around the pattern.

[0015] According to some embodiments of the present invention, the first die is provided with a first injection port, the second die is provided with a second injection port, and the first injection port and the second injection port are coplanar.

[0016] According to a third aspect of the present invention, a mold is used in a method for manufacturing a two-color injection molded product as described in the above embodiments.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a flowchart of a method for manufacturing a two-color injection molded product according to the present invention;

[0020] Figure 2 yes Figure 1 A flowchart illustrating the steps involved in designing and manufacturing the first injection mold, molding block, and slide based on a closed graphic.

[0021] Figure 3 yes Figure 1 A flowchart of the steps for designing and manufacturing the row position based on the molding block;

[0022] Figure 4 yes Figure 1 A flowchart illustrating the steps involved in designing and manufacturing the second injection mold based on the first injection mold.

[0023] Figure 5 This is a schematic diagram of the structure of a first injection mold according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the first moving mold according to an embodiment of the present invention;

[0025] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0026] Figure 8This is a structural schematic diagram of a two-color product according to an embodiment of the present invention;

[0027] Figure 9 This is a cross-sectional view of a two-color product according to an embodiment of the present invention;

[0028] Figure 10 This is a rear view of a two-color product according to an embodiment of the present invention.

[0029] Reference numerals: First injection mold 100; First groove 101; Fixed mold 110; First moving mold 120; Molding block 121; Angled ejector 122; Slide 200; First injection mold 300; Through hole 301; Glue channel 302; Graphic protrusion 310; First injection port 320; Second injection mold 400; Graphic hole 401; Filling part 410; Center part 411; Flanged part 420; Second injection port 430. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0034] Reference Figure 1 and Figure 5 As shown, a method for manufacturing a two-color injection molded product according to a first aspect embodiment of the present invention includes the following steps:

[0035] S100: Based on the closed graphic design, the first injection mold, molding block and slide are manufactured, and the slide and molding block abut against each other;

[0036] S200: Perform the first injection molding and obtain the first die. The first die forms a through hole through the molding block. The through hole matches the inner contour of the closed graphic. The first die forms a through groove through the slide. The through groove and the through hole are connected.

[0037] S300: Design and manufacture a second injection mold based on the first injection mold, and place the first injection mold into the second injection mold;

[0038] S400: Perform a second injection molding to obtain the second injection. The adhesive of the second injection enters through the glue channel and fills the through hole. The second injection and the first injection are combined to form the product.

[0039] S500: Controls the ejection of the product from the second injection mold.

[0040] Understandably, before injection molding a product, the first injection mold 100 needs to be designed based on the graphics on the product. For example, the product graphics in this embodiment include non-closed graphics such as the character "H", the character "L", and double-headed arrows, and closed graphics such as the character "O", the character "D", and a car. For non-closed graphics, it is only necessary to design grooves in the first injection mold 100 according to conventional design and matching of graphic shape, which will not be elaborated here. However, for closed graphics, it is also necessary to set the molding block 121 and the slide 200. The slide 200 is located below the molding block 121 and abuts against the molding block 121 to prevent the glue from clogging the through hole 301 and the glue channel 302. By setting the molding block 121 and the slide 200, Position 200 allows for the formation of a roughly closed shape on the first injection molded die 300. The inner contour of the closed shape is a through hole 301, which connects to the outside via a glue channel 302. A second injection mold is then designed and manufactured for a second injection molding process. The glue from the second injection enters through the glue channel 302 and fills the through hole 301, resulting in the second injection mold 400 partially filling the inner contour of the closed shape of the first injection molded die 300. This improves the bonding between the first and second injection molds 300 and enhances the structural tightness of the product. Simultaneously, it allows the inner and outer parts of the closed shape to display different colors, making the closed shape clearer and more aesthetically pleasing, effectively improving the appearance of the two-color injection molded product.

[0041] Reference Figure 2 , Figure 6 and Figure 7 In some embodiments, step S100 includes, but is not limited to, the following steps:

[0042] S110: Prepare the fixed mold and the first moving mold, set the first groove on the first moving mold according to the outer contour of the closed shape, and set the molding block in the first groove according to the inner contour of the closed shape;

[0043] S120: Create the slide according to the molding block.

[0044] It is understandable that a closed graphic, such as the character "O," is mainly composed of two closed lines of different sizes. The larger closed line on the outside forms the outer contour of the closed graphic, and the smaller closed line on the inside forms the inner contour. The first groove 101, designed according to the outer contour of the closed graphic, allows the adhesive to be injected during the first injection molding process to form a protruding graphic 310 without an inner contour. The molding block 121, designed according to the inner contour of the closed graphic, is located within the first groove 101. When the adhesive flows through the first groove 101, it flows around the molding block 121, thus forming a hollow area on the protruding graphic 310. Since the inner contour of the closed cross-section of the molding block 121 matches the shape of the inner contour, the hollow area for molding the adhesive is the through hole 301 that matches the shape of the inner contour of the closed cross-section. Subsequently, to avoid blockage below the through hole 301, a slide 200 that abuts against the molding block 121 needs to be made. At this time, a first cavity (not shown in the figure) for molding the first die 300 is formed between the slide 200, the molding block 121, the fixed mold 110, and the groove wall of the first groove 101. When the adhesive flows in the first cavity, it flows not only around the molding block 121 but also around the slide 200, thereby forming an undercut structure that communicates with the outside below the through hole 301. This undercut structure is the through groove 302. The molding block 121 and the slide 200 have simple structures and are easy to manufacture, facilitating large-scale production and processing of the mold, making them suitable for widespread use.

[0045] It should be added that the molding block 121 can be integrally formed with the first moving mold 120. That is, during the process of opening the first groove 101, the area of ​​the molding block 121 can be avoided, and the molding block 121 can be naturally obtained, thereby improving the integrity of the first moving mold 120 and the sealing of the cavity. The molding block 121 can also be connected to the first moving mold 120 in the form of an insert, which facilitates user maintenance and replacement, expands the application range of the mold, and extends the service life of the mold. Here, there is no specific limitation on the connection method between the molding block 121 and the first moving mold 120, as long as it can ensure that the internal through hole 301 of the graphic protrusion 310 can be formed.

[0046] Reference Figure 3 , Figure 6 and Figure 7 In some embodiments, step S120 includes, but is not limited to, the following steps:

[0047] S121: An inclined ejector is installed on the first moving mold, and the inclined ejector and the first moving mold slide together;

[0048] S122: A slide is installed on the inclined top. The slide extends toward the first groove and is located below the molding block. When the first moving mold and the fixed mold are closed, the end of the slide abuts against the molding block. When the first moving mold and the fixed mold are opened, the inclined top drives the slide to disengage from the glue channel.

[0049] It is understandable that the through groove 302 can be approximated as an undercut located on the side wall of the first injection mold 300. Therefore, when the first injection mold 100 opens, the slide 200 cannot automatically disengage from the through groove 302. Thus, a slanted ejector 122 (driven by conventional drive components such as cylinders) is needed to move the slide 200, allowing it to automatically disengage from the through groove 302 along with the first moving mold 120 during mold opening. Furthermore, when there is more than one closed shape, i.e., multiple molding blocks 121, multiple slides 200 are also required. Depending on the position of the closed shape, multiple slides 200 can be connected to the same slanted ejector 122, or they can be connected to multiple slanted ejectors 122 respectively, for example... Figure 7 The two closed shapes “O” and “D” shown are located on the same side of the product and are close to each other. The two corresponding slides 200 of the two closed shapes can be connected to the same inclined ejector 122. By setting the inclined ejector 122, the slides 200 can move synchronously with the first moving mold 120, saving the time and labor costs required for users to manually load and unload the slides 200, effectively improving the smoothness of mold injection and improving the production efficiency of the product.

[0050] Furthermore, the slide 200 has rounded corners at its ends and a tapered shape. By rounding the ends of the slide 200, after the adhesive forms the flow groove 302 around the slide 200, the portion of the flow groove 302 below the through hole 301 will form an arc surface. This avoids or reduces the impact and backflow problem of the adhesive at the connection between the flow groove 302 and the through hole 301, ensuring the injection quality of the second die 400. Setting the slide 200 to a tapered shape, combined with the rounded corners at its ends, reduces the friction between the slide 200 and the first die 300, facilitating the slide 200's rapid disengagement from the flow groove 302 and further improving the mold's injection efficiency.

[0051] Reference Figure 4 In some embodiments, step S400 includes, but is not limited to, the following steps:

[0052] S410: Prepare a second moving mold (not shown in the figure), and set a second groove on the second moving mold according to the outer contour of the first mold;

[0053] S420: A graphic block is set in the second groove according to the top surface outline of the first die. A second cavity is formed between the graphic block, the first die, and the groove wall of the second groove. The second cavity is used to form the second die. The second die forms a graphic hole through the graphic block. The graphic hole and the closed graphic shape match and are located above the first die.

[0054] It should be noted that in two-color injection molding technology, the fixed mold 110 containing the first die 300 usually remains unchanged. Two-color injection molding is achieved by changing the moving mold. Therefore, the first injection mold 100 is a combination of the first moving mold 120 and the fixed mold 110, and the second injection mold is a combination of the second moving mold and the fixed mold 110. The structure of the second moving mold (including the second groove, graphic blocks, etc. set in the second moving mold) is similar to that of the first moving mold 120. See attached diagram for details. Figure 6 The description of the first moving mold 120 mentioned above is sufficient and will not be repeated here.

[0055] Understandably, the second groove is designed according to the outer contour of the first die 300. During the second injection molding, the adhesive of the second die 400 can cover the surface of the first die 300, hiding the structure of the first die 300 on the front and sides of the product, effectively improving the neatness of the product's appearance. The graphic block in the second groove corresponds to the graphic protrusion 310 on the first die 300 in position and matches in shape, ensuring that the second die 400 can clearly and distinctly reveal the pattern on the first die 300 of different colors, giving the product a three-dimensional appearance and further improving the product's aesthetic appeal.

[0056] Reference Figure 8 The two-color product of the second aspect of the present invention includes a first die 300 and a second die 400 made by the manufacturing method of the two-color injection molded product of the embodiment of the manufacturing method of the two-color injection molded product.

[0057] Since the two-color product adopts all the technical solutions of the manufacturing method of the two-color injection molded product in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here.

[0058] Reference Figure 8 It is understandable that the first die 300 has a glue channel 302 and a graphic protrusion 310, which has a through hole 301 located above and communicating with the glue channel 302. The second die 400 has a filling part 410, which engages with the glue channel 302. The filling part 410 has a center part 411, which engages with the through hole 301. Since the glue channel 302 is formed by the slide 200, after the slide 200 leaves the glue channel 302, a gap will be left on the side of the first die 300 to avoid the slide 200. When injection molding the second die 400, it is necessary to design the filling part 410 to fill the gap and the glue channel 302, and then fill the filling part 410 through the center part 411. This design further improves the bonding between the first die 300 and the second die 400, while also improving the integrity of the product's shape.

[0059] Reference Figure 8 and Figure 9It is understandable that the second die 400 is provided with a flange 420, which surrounds the graphic protrusion 310. When the size of the graphic block of the second moving die is slightly smaller than the size of the graphic protrusion 310 on the first die 300, the graphic hole 401 on the second die 400 that exposes the graphic protrusion 310 is slightly smaller than the graphic protrusion 310. The reduced part of the graphic hole 401 is the flange 420. By providing the flange 420, on the one hand, the flange 420 can cover the outer contour of the graphic protrusion 310, preventing the graphic protrusion 310 of the first die 300 from overflowing with color; on the other hand, the flange 420 on the center part 411 is slightly larger than the through hole 301, making the inner contour of the closed graphic clearer. The combination of the two can further improve the clarity of the graphic protrusion 310 and improve the user's visual experience.

[0060] Reference Figure 10 It is understandable that the first die 300 has a first injection port 320, and the second die 400 has a second injection port 430, with the first injection port 320 and the second injection port 430 being coplanar. With this arrangement, the injection ports of the mold can both be located on the fixed mold 110, and the two injection ports can be designed to be close in position and similar in structure, thereby simplifying the mold structure and facilitating product demolding.

[0061] The mold of the third aspect of the present invention is used in the manufacturing method of the two-color injection molded product as described in the above embodiments.

[0062] Since the mold can apply all the technical solutions of the manufacturing method of the two-color injection molded product described in the above embodiments, the products produced by it have at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0063] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for manufacturing a two-color injection molded product, characterized in that, include: The first injection mold, molding block, and slide are manufactured according to the closed graphic design, wherein the slide and molding block abut against each other; The steps of designing and manufacturing the first injection mold, molding block, and slide according to the closed graphic include: Prepare a fixed mold and a first moving mold. Set a first groove on the first moving mold according to the outer contour of the closed shape, and set the molding block in the first groove according to the inner contour of the closed shape. The row position is designed and manufactured according to the molding block; The step of designing and manufacturing the sliding position according to the molding block includes: An inclined ejector is installed on the first moving mold, and the inclined ejector and the first moving mold are in sliding engagement. The slide is installed on the inclined top, the slide extends toward the first groove and is located below the molding block. When the first moving mold and the fixed mold are closed, the end of the slide abuts against the molding block. When the first moving mold and the fixed mold are opened, the inclined top drives the slide to disengage from the glue channel. The first injection molding is performed to obtain the first die. The first die forms a through hole through the molding block. The through hole matches the inner contour of the closed shape. The first die forms a glue channel through the slide. The glue channel is connected to the through hole. A second injection mold is designed and manufactured according to the first injection mold, and the first injection mold is placed in the second injection mold; A second injection molding process is performed to obtain a second die. The adhesive of the second die enters through the glue channel and fills the through hole. The second die and the first die are fitted together to form a product, such that the second die has a flanged part. The flanged part is set to protrude around the pattern formed by the first injection molding on the first die. Control the ejection of the product from the second injection mold.

2. The method for manufacturing a two-color injection molded product according to claim 1, characterized in that, The step of designing and manufacturing the second injection mold according to the first injection mold includes: Prepare a second moving mold, and set a second groove on the second moving mold according to the outer contour of the first mold; A graphic block is set in the second groove according to the top surface contour of the first die. A second cavity is formed between the graphic block, the first die and the groove wall of the second groove. The second cavity is used to form the second die. The second die forms a graphic hole through the graphic block. The graphic hole matches the shape of the closed graphic and is located above the first die.

3. The method for manufacturing a two-color injection molded product according to claim 1, characterized in that, The ends of the row positions are rounded.

4. A two-color product, characterized in that, This includes a first and a second ingot made using the manufacturing method of a two-color injection molded product as described in any one of claims 1 to 3.

5. A two-color product according to claim 4, characterized in that, The first die has a glue channel and a graphic protrusion. The graphic protrusion has a through hole located above the glue channel and communicating with the glue channel. The second die has a filling part. The glue channel and the filling part are engaged. The filling part has a central part, which is engaged with the through hole.

6. A two-color product according to claim 4, characterized in that, The second die has a flanged portion, which protrudes around the graphic.

7. A two-color product according to claim 4, characterized in that, The first die has a first injection port, and the second die has a second injection port, with the first injection port and the second injection port being coplanar.

8. A mold, characterized in that, A method for manufacturing a two-color injection molded product as described in any one of claims 1 to 3.

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