A two-color injection mold

Abstract

This invention relates to the field of mold technology and discloses a two-color injection mold. The two-color injection mold includes a moving mold, a first-shot stationary mold, a second-shot stationary mold, and a floating ejector structure disposed on the moving mold. The floating ejector structure includes an ejector rod, an ejector head, an ejector component, and a limiting component. The ejector rod includes a first rod portion forming a first angle with the demolding direction and a second rod portion forming a second angle with the demolding direction. The ejector head can float along the top end of the first rod portion. The ejector component is connected to the ejector head and is used to cause the ejector head to abut against the first rod portion towards the first-shot stationary mold during the first-shot injection process. The limiting component is connected to the ejector head and is used to limit... The maximum ejection distance of the angled ejector along the first rod is defined. When the moving mold and the first-shot stationary mold are closed, the angled ejector, the first-shot stationary mold, and the moving mold together form a first-shot cavity for molding a part with an undercut structure. When the moving mold and the second-shot stationary mold are closed, the parting surface height of the second-shot stationary mold in contact with the angled ejector is higher than that of the first-shot stationary mold in contact with the angled ejector. This drives the angled ejector to move along the first rod towards the moving mold, forming a reverse-wrapping injection space at the undercut position of the first-shot molded part to accommodate the second-shot material. The aforementioned two-color injection mold, by adding a floating angled ejector structure, with the floating angled ejector head and dual-angle angled ejector rod, effectively solves the technical problems of undercutting and demolding in two-color injection molded products. Simultaneously, it features a simple structure, accurate positioning, low manufacturing cost, and high production efficiency.

Description

Technical Field

[0001] This invention relates to the field of home appliance manufacturing technology, and in particular to a two-color injection mold. Background Technology

[0002] Currently, products requiring a soft-touch or leather-like surface are typically achieved through a post-processing overlay. However, due to rising material and post-processing costs, an increasing number of leather-effect products utilize two-color injection molding. For example, the first injection is a hard plastic, commonly made of PC, ABS, PP, etc., while the second injection is a soft plastic, such as TPE, TPU, TPEE, etc. Because the second injection is soft plastic, and the mold surface is textured with a leather-like pattern, the two-color injection molded product achieves the soft-touch feel and leather-like effect of an overlaid product. However, this traditional process has a drawback: it's difficult to easily mold a product with the soft plastic overlay from the second injection. Since the first injection needs to remain on the moving mold side for rotation, it's challenging to achieve the soft plastic overlay at the undercut position. Typically, achieving this effect requires a slider structure on the parting line. However, this is not feasible for products with an undercut structure requiring a slanted ejector. Furthermore, the slider structure in two-color injection molding has a significant drawback: poor positioning and slippage can occur during rotation on the moving mold side.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0004] In response to the problems mentioned in the background art, this application provides a two-color injection mold. By adding a floating angled ejector structure, the floating angled ejector head, together with the angled ejector rod with a double angle, can achieve the effect of two-color product two-shot soft rubber reverse wrapping and the function of product demolding and ejection at the undercut position. This solves the problem that traditional designs cannot achieve this reverse wrapping effect and demolding undercut function.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, a two-color injection mold is provided, comprising: Moving mold, first-shot stationary mold, and second-shot stationary mold; It also includes a floating inclined top structure disposed on the moving mold; The floating inclined top structure includes: The angled ejector pin includes a first rod portion forming a first angle with the demolding direction and a second rod portion forming a second angle with the demolding direction; The angled jack can float along the top of the first rod. An ejector, connected to the angled ejector head, is used to cause the angled ejector head to abut against the first rod portion in the direction of the injection mold during a single injection molding process; A limiting component, connected to the inclined ejector head, is used to limit the maximum ejection distance of the inclined ejector head along the first rod portion; in, When the moving mold and the stationary mold are closed, the angled ejector, the stationary mold and the moving mold together form a mold cavity for molding a part with an undercut structure. When the moving mold and the second injection stationary mold are closed, the parting surface height of the second injection stationary mold in contact with the inclined ejector is higher than that of the first injection stationary mold in contact with the inclined ejector. This drives the inclined ejector to move along the first rod towards the moving mold, forming a reverse-wrapping injection space at the undercut position of the first injection molded part to accommodate the second injection material.

[0006] By adding a floating angled ejector structure, the floating angled ejector head, together with the double-angled ejector rod, can achieve the effect of two-color products being wrapped in soft rubber after two-shot injection, and can also achieve the function of demolding and ejecting the product from the undercut position.

[0007] In some embodiments of this application, the ejector is an elastic member, which is used to elastically abut the angled ejector head along the first rod portion toward the stationary mold during a single injection molding process. This elastic abutment method can better accommodate errors in mold processing and assembly, improving the robustness of the mold.

[0008] In some embodiments of this application, the limiting member includes a head and a threaded rod; the inclined head has a through hole, and the inner wall of the through hole has a limiting portion; the first rod is at least partially located within the through hole; the limiting member is disposed within the through hole, and the rod of the limiting member is threadedly connected to the top end of the first rod; the head of the limiting member abuts against the limiting portion. The limiting member achieves a connection and fixing function through a threaded connection. In addition, the limiting distance can be precisely controlled by adjusting the screw-in depth of the thread, thereby precisely controlling the wall thickness of the double-shot reverse wrapping.

[0009] In some embodiments of this application, the limiting member is a height-equalizing screw. The height-equalizing screw has precise dimensions and stable performance, which can better ensure the accuracy of the limiting distance, accurately control the backfill wall thickness, and improve the dimensional accuracy and quality stability of the product.

[0010] In some embodiments of this application, the elastic element is a spring, which is sleeved on the rod portion of the limiting member, with one end abutting against the end face of the first rod portion and the other end abutting against the limiting portion. The spring can stably provide the resisting force and facilitates assembly and maintenance.

[0011] In some embodiments of this application, the ejector is a cylinder.

[0012] In some embodiments of this application, the injection mold includes a first boss structure for restricting the horizontal movement of the angled ejector during injection molding.

[0013] In some embodiments of this application, the two-shot stationary mold includes a second boss structure, which is used to restrict the horizontal movement of the angled ejector during the two-shot injection molding process. Through the limiting effect of the first and second boss structures, the positioning accuracy of the angled ejector during both the first and second shot molding processes is improved, thereby enhancing the dimensional accuracy and quality of the product.

[0014] In some embodiments of this application, the angled ejector head, in cooperation with the moving mold to form the undercut structure, has a forming portion on its side. The forming angle between the side of the angled ejector head forming the undercut structure and the demolding direction is equal to the first angle, and the forming angle between the forming portion and the demolding direction is equal to the first angle. This ensures the correct forming of the undercut structure and guarantees that the angled ejector head can retract along the first angle of the first rod after injection molding.

[0015] In some embodiments of this application, the angle between the side of the angled ejector head away from the undercut structure of the injection molded part and the demolding direction is 3-5° larger than the second angle. By increasing the tilt angle by 3-5°, it can be ensured that the angled ejector head can be smoothly ejected and retracted.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: In the above embodiments, the two-color injection mold, by adding a floating angled ejector structure, with the floating angled ejector head and the double-angled ejector rod, precisely controls the formation of the reverse wrapping space during two-shot injection, and realizes the effective wrapping of the undercut structure by the soft rubber.

[0017] Meanwhile, the floating inclined top structure, through the cooperation of the limiting component and the ejector component, achieves precise positioning of the inclined top head in the first and second injection processes, ensuring the dimensional accuracy of the inverted structure and the uniformity of the reverse wrapping wall thickness, thereby improving the overall quality and consistency of the product, avoiding problems such as inaccurate positioning and slippage that may occur during the rotation of the traditional slider mechanism, and improving the product qualification rate.

[0018] Furthermore, compared to traditional slider mechanisms or other complex parting surface designs, the floating inclined top structure of this invention is simpler and more compact, reducing the number of mold parts and lowering the manufacturing and maintenance costs of the mold.

[0019] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the mold assembly structure of a stationary mold and a moving mold in a two-color injection mold according to some embodiments is shown; Figure 2 A perspective view of a floating sloping ejector structure in a two-color injection mold according to some embodiments is shown; Figure 3 A cross-sectional view of a floating sloping top structure in a two-color injection mold according to some embodiments is shown; Figure 4 A schematic diagram of a floating sloping ejector structure in a two-color injection mold according to some embodiments is shown; Figure 5 A schematic diagram of the mold closing structure of a two-color injection mold with a stationary mold and a moving mold according to some embodiments is shown; Figure 6 A schematic diagram of the retraction of the angled ejector head in a two-color injection mold according to some embodiments is shown; Figure 7 A schematic diagram of the formation of a soft rubber inverted structure after two-shot injection molding is shown in a two-color injection mold according to some embodiments; Figure 8 A schematic diagram of the structure of a single-shot molded part in a two-color injection mold according to some embodiments is shown; Figure 9 A schematic diagram of mold opening and demolding of a two-color injection mold according to some embodiments is shown; Figure 10 A schematic diagram showing the side angle of the angled ejector head away from the undercut structure in a two-color injection mold according to some embodiments is shown; Explanation of reference numerals in the attached figures: 100-Moving mold; 200 - First injection stationary mold; 210 - First boss structure; 300 - Second-shot stationary mold; 310 - Second boss structure; 400 - Floating sloping roof structure; 410 - Angled top member; 411 - First member section; 412 - Second member section; 420 - Angled ejector; 421 - Through hole; 422 - Limiting part; 423 - Forming part; 430 - Top-out component; 440 - Limiting component; 441 - Head; 442 - Rod section; 500 - Injection molded parts; 600 - Two-shot molded part; 610 - Reverse wrapping part. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 limitations on this application.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0028] like Figures 1-10 As shown, some embodiments of this application provide a two-color injection mold for molding two-color injection molded products with a soft rubber inverted structure. The two-color injection molded product is made of two materials: a first injection material is injection molded to form a first injection molded part 500 (typically a rigid plastic), and a second injection material is injection molded to form a second injection molded part 600 (typically a soft elastomer).

[0029] This two-color injection mold is a rotary two-color injection mold. Its core function lies in the rotation of the moving mold 100, which sequentially engages with the first-shot stationary mold 200 and the second-shot stationary mold 300 to complete the injection molding of two materials. The mold mainly includes the following components: Moving mold 100: The moving mold 100 is the movable part of the mold, usually mounted on the moving mold plate of the injection molding machine. In this invention, the moving mold 100 is not only responsible for the opening and closing of the mold, but also undertakes the function of rotation, transferring the first-shot molded part 500 from the first-shot station to the second-shot station. The moving mold 100 is equipped with a slanted ejector structure, which is key to achieving the inverted wrapping structure.

[0030] Stationary mold 200: The stationary mold 200 is the fixed part of the mold, usually installed on the fixed template of the injection molding machine. It cooperates with the moving mold 100 to form the mold cavity for injection molding of the part 500.

[0031] Second-shot stationary mold 300: The second-shot stationary mold 300 is also a fixed part of the mold, and it is also installed on the fixed template of the injection molding machine. It cooperates with the rotating mold 100 in its rotated position to form a mold cavity for injection molding the second-shot part 600.

[0032] The moving mold 100 is equipped with a floating inclined ejector structure 400. The floating inclined ejector structure 400 is used to solve the problems of reverse wrapping and demolding of the undercut structure.

[0033] Specifically, such as Figures 2-4 As shown, the floating inclined top structure 400 includes an inclined top rod 410, an inclined top head 420, an ejector 430, and a limiting member 440.

[0034] Inclined push rod 410: The inclined push rod 410 is not a single inclination angle, but has two different inclination angles. The inclined push rod 410 includes a first rod part 411 and a second rod part 412 connected to each other.

[0035] The first rod 411 forms a first angle α1 with the demolding direction (product ejection direction, which is the vertical direction in this application), and is used to drive the inclined ejector head 420 to retract during two-shot injection molding to form a reverse injection space.

[0036] The second rod 412 forms a second angle α2 with the demolding direction, which is used to eject the product when the mold opens, achieving inverted demolding. The two angles of the angled ejector rod 410 ensure smooth back-wrapping and demolding.

[0037] Angled jack 420: The angled jack 420 is slidably disposed at the top of the first rod 411, that is, the angled jack 420 is floatable.

[0038] The main function of the angled ejector 420 is to participate in the formation of the undercut structure 510 during injection molding, such as... Figure 8 It also retreats during the second injection molding process to form a reverse injection space, and ejects the product when the mold opens.

[0039] Ejector 430: Connected to the angled ejector head 420, used to push the angled ejector head 420 against the first rod portion 411 toward the first injection stationary mold 200 during the injection molding process, preventing the angled ejector head 420 from descending.

[0040] The ejector 430 ensures that the angled ejector head 420 can be accurately positioned during injection molding and cooperates with the injection stationary mold 200 to form a complete mold cavity.

[0041] Limiting element 440: connected to the angled ejector 420, used to limit the maximum ejection distance of the angled ejector 420 in a single injection molding process.

[0042] The limiting component 440 controls the position of the angled ejector 420 during the first injection molding process and limits the distance between the angled ejector 420 in the first and second injections.

[0043] Among them, such as Figure 6 As shown, the retraction distance L of the limiting member 440 and the wall thickness H of the reverse wrapping part 610 of the two-shot molded part 600 are given by H=L*cosα1.

[0044] The workflow for this two-color injection mold is as follows: 1. One-shot injection molding like Figure 1 As shown, the moving mold 100 and the stationary mold 200 are closed together, and the inclined ejector head 420, the stationary mold 200 and the moving mold 100 together form a mold cavity for molding a molded part 500 with an undercut structure 510.

[0045] Material is injected into the mold cavity to form a one-shot molded part 500. At this time, the angled ejector head 420 cooperates with the one-shot stationary mold 200 to jointly form the cavity of the undercut structure. The ejector 430 pushes the angled ejector head 420 to make it fit tightly against the one-shot stationary mold 200. The limiting member 440 controls the protruding length of the angled ejector head 420 to ensure the dimensional accuracy of the undercut structure.

[0046] 2. Rotation of the moving mold The mold opens, but the product (one-shot molded part 500) remains on the moving mold 100.

[0047] The moving mold 100 rotates 180° (or other angles, depending on the specific design) to transfer the first-shot part 500 to the second-shot station.

[0048] 3. Two-shot injection molding like Figure 5 As shown, the moving mold 100 rotates to close with the second-shot stationary mold 300. Since the parting surface A1 of the second-shot stationary mold 300, which contacts the inclined ejector head 420, is higher than the parting surface A2 of the first-shot stationary mold 200, which contacts the inclined ejector head 420, the inclined ejector head 420 is pushed to move along the first rod portion 411 toward the moving mold 100, forming a reverse-encapsulation injection space at the undercut position of the first-shot molded part 500 to accommodate the second-shot material. This reverse-encapsulation injection space forms part of the second-shot mold cavity.

[0049] The two-shot material is injected into the two-shot mold cavity and combined with the first-shot molded part 500 to form the final two-color injection molded product, wherein the reverse-wrapping part 610 of the two-shot molded part 600 is formed at the reverse-wrapping injection space.

[0050] 4. Mold opening and demolding like Figure 9 As shown, when the mold opens and ejects the product, the inclined ejector head 420 ejects the product along the second rod 412, achieving inverted demolding.

[0051] This application adds a floating angled ejector structure. The floating angled ejector head 420, together with the double-angled ejector rod 410, precisely controls the formation of the reverse wrapping space during two-shot injection molding, and achieves effective wrapping of the inverted structure by the soft rubber.

[0052] Meanwhile, the floating inclined top structure, through the cooperation of the limiting component 440 and the ejector component 430, achieves precise positioning of the inclined top head 420 in the first and second injection processes, ensuring the dimensional accuracy of the inverted structure and the uniformity of the reverse wrapping wall thickness, thereby improving the overall quality and consistency of the product, avoiding problems such as inaccurate positioning and slippage that may occur during the rotation of the traditional slider mechanism, and improving the product qualification rate.

[0053] Furthermore, compared to traditional slider mechanisms or other complex parting surface designs, the floating inclined top structure of this invention is simpler and more compact, reducing the number of mold parts and lowering the manufacturing and maintenance costs of the mold.

[0054] In some embodiments of this application, the ejector 430 is an elastic element.

[0055] The elastic element is used to elastically push the angled ejector head 420 along the first rod portion 411 toward the injection stationary mold 200 during the injection molding process.

[0056] The elastic element can provide a stable resisting force, ensuring a good fit between the angled ejector head 420 and the first injection stationary mold 200, and allowing the angled ejector head 420 to retract smoothly during the second injection.

[0057] Specifically, during the injection molding process, the elastic force generated by the elastic component pushes the inclined ejector head 420 so that it fits tightly against the parting surface of the injection stationary mold 200, together forming a complete mold cavity, ensuring the precise molding of the injection molded part 500.

[0058] When the moving mold 100 rotates to close with the stationary mold 300, the parting surface of the stationary mold 300 pushes the inclined ejector head 420 to overcome the elastic force of the elastic component and retract, thus forming a reverse-enclosure space. This elastic support method not only ensures the accuracy of the first-shot molding but also facilitates the second-shot molding process, simplifies the mold structure, and improves production efficiency.

[0059] By using an elastic element as the ejector 430, the mold structure is simplified, manufacturing costs are reduced, and the reliability and service life of the mold are improved. The elastic ejection method can better adapt to errors in mold processing and assembly, thus improving the robustness of the mold.

[0060] In some embodiments of this application, such as Figure 3 As shown, the limiting member 440 includes a head 441 and a threaded rod portion 442.

[0061] The inclined top 420 is provided with a through hole 421, and the inner wall of the through hole 421 is provided with a limiting part 422 (e.g., an annular step).

[0062] The first rod portion 411 is at least partially located within the through hole 421.

[0063] The rod portion 442 of the limiting member 440 passes through the through hole 421 and is fixedly connected to the top end of the first rod portion 411 by threads.

[0064] The first rod portion 411 and the rod portion 442 of the limiting member 440 are coaxially arranged to ensure that the inclined head 420 can float along the first angle of the first rod portion 411.

[0065] The head 441 of the limiting member 440 abuts against the limiting part 422 on the inner wall of the through hole 421, thereby limiting the maximum ejection distance of the inclined ejector head 420 in a single injection molding process.

[0066] The limiting component 440 achieves the connection and fixing function through a threaded connection. In addition, the limiting distance can be precisely controlled by adjusting the screw depth of the thread, thereby precisely controlling the wall thickness of the double-shot reverse wrap.

[0067] In some embodiments of this application, the limiting member 440 is a height-equalizing screw. The height-equalizing screw has precise dimensions and stable performance, which can better ensure the accuracy of the limiting distance, accurately control the backfill wall thickness, and improve the dimensional accuracy and quality stability of the product.

[0068] In some embodiments of this application, the limiting member 440 may be an integral structure with the inclined push rod 410.

[0069] In some embodiments of this application, the elastic element is a spring.

[0070] The spring is sleeved on the rod portion 442 of the limiting member 440, with one end abutting against the end face of the first rod portion 411 and the other end abutting against the limiting portion 422 on the inner wall of the through hole 421. This installation method allows the spring to stably provide the resisting force and facilitates assembly and maintenance.

[0071] In some other embodiments of this application, a cylinder can be used as the ejector 430. Using a cylinder as the ejector can better ensure the tight fit between the angled ejector head and the stationary mold during the injection molding process, especially when the undercut structure is complex or the mold size is large, effectively preventing defects in the injection molded parts. At the same time, the rapid response characteristics of the cylinder also help to improve production efficiency.

[0072] In some other embodiments of this application, the drive mechanism, such as an electric push rod, is an ejector 430.

[0073] In some other embodiments of this application, a nitrogen spring may be used as the ejector 430.

[0074] In some embodiments of this application, the injection mold 200 includes a first boss structure 210, which is used to restrict the movement of the inclined ejector head 420 in the horizontal direction during the injection molding process, so as to ensure the positioning accuracy of the inclined ejector head 420 during injection molding.

[0075] The limiting effect of the first boss structure 210 improves the positioning accuracy of the angled head 420 during injection molding, thereby improving the dimensional accuracy and quality of the product.

[0076] In some embodiments of this application, the two-shot stationary mold 300 includes a second boss structure 310, which is used to restrict the movement of the inclined ejector head 420 in the horizontal direction during the two-shot injection molding process, so as to ensure the positioning accuracy of the inclined ejector head 420 during the two-shot molding.

[0077] The limiting effect of the second boss structure 310 improves the positioning accuracy of the angled head 420 during two-shot molding, thereby improving the dimensional accuracy and quality of the product.

[0078] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the inclined ejector 420, in conjunction with the moving mold 100, forms an undercut structure with a molding portion 423 on its side. The angle θ1 formed between the side of the inclined ejector 420 forming the undercut structure and the demolding direction is equal to the first angle α1, and the angle θ2 formed between the molding portion 423 and the demolding direction is equal to the first angle α1. This ensures the correct molding of the undercut structure and ensures that the inclined ejector 420 can retract along the first angle of the first rod portion 411 after injection molding.

[0079] Specifically, the angled ejector 420 is not a simple columnar or block structure. Its side, which cooperates with the moving mold 100 to form an undercut structure, has a specific geometric shape, namely the forming part 423. The inclination angle of the forming part 423 must be consistent with the inclination angle (first angle α1) of the first rod part 411 of the angled ejector 410.

[0080] In some embodiments of this application, such as Figure 10 As shown, the angle β between the side of the inclined ejector head 420 away from the undercut structure of the injection molded part 500 and the demolding direction is 3~5° larger than the second angle α2.

[0081] This side, which is the side that the angled ejector head 420 faces when it retracts after demolding, has an inclination angle that is slightly greater than the inclination angle (second angle α2) of the second rod portion 412 of the angled ejector rod 410.

[0082] If these two angles are equal, the angled ejector head 420 may get stuck during ejection and retraction. By increasing the tilt angle by 3-5°, the angled ejector head 420 can be ensured to eject and retract smoothly. This is similar to the draft angle in mold design, but the effect is on the angled ejector head 420 itself.

[0083] The second angle α2 of the inclined push rod 410 needs to be calculated and designed based on the product's undercut distance.

[0084] In some embodiments of this application, the first-shot material is a hard adhesive, including but not limited to PCABS, ABS, PP and other materials, and the second-shot material is a soft adhesive, including but not limited to TPE, TPU, TPEE and other materials.

[0085] Because the second injection is made of soft rubber, and the surface of the mold is made with a leather texture, the two-color injection molded product can have the soft rubber feel and leather effect of the encased product.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0087] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A two-color injection mold, comprising: Moving mold, first-shot stationary mold, and second-shot stationary mold; Its features are, It also includes a floating inclined top structure disposed on the moving mold; The floating inclined top structure includes: The angled ejector pin includes a first rod portion forming a first angle with the demolding direction and a second rod portion forming a second angle with the demolding direction; The angled jack can float along the top of the first rod. An ejector, connected to the angled ejector head, is used to cause the angled ejector head to abut against the first rod portion in the direction of the injection mold during a single injection molding process; A limiting component, connected to the inclined ejector head, is used to limit the maximum ejection distance of the inclined ejector head along the first rod portion; in, When the moving mold and the stationary mold are closed, the angled ejector, the stationary mold and the moving mold together form a mold cavity for molding a part with an undercut structure. When the moving mold and the second injection stationary mold are closed, the parting surface height of the second injection stationary mold in contact with the inclined ejector is higher than that of the first injection stationary mold in contact with the inclined ejector. This drives the inclined ejector to move along the first rod towards the moving mold, forming a reverse-wrapping injection space at the undercut position of the first injection molded part to accommodate the second injection material.

2. The two-color injection mold according to claim 1, characterized in that, The ejector is an elastic element, which is used to elastically push the angled ejector head against the first rod in the direction of the injection mold during the injection process.

3. The two-color injection mold according to claim 2, characterized in that, The limiting member includes a head and a threaded rod portion; The inclined top is provided with a through hole, and the inner wall of the through hole is provided with a limiting part; the first rod portion is at least partially located inside the through hole; The limiting member is disposed in the through hole, and the rod portion of the limiting member is threadedly connected to the top end of the first rod portion; the head of the limiting member abuts against the limiting portion.

4. The two-color injection mold according to claim 3, characterized in that, The limiting component is a height-equalizing screw.

5. The two-color injection mold according to claim 4, characterized in that, The elastic element is a spring, which is sleeved on the rod of the limiting member. One end of the spring abuts against the end face of the first rod, and the other end abuts against the limiting part.

6. The two-color injection mold according to claim 1, characterized in that, The ejector component is a cylinder.

7. The two-color injection mold according to claim 1, characterized in that, The injection mold includes a first boss structure, which is used to restrict the horizontal movement of the angled ejector during the injection molding process.

8. The two-color injection mold according to claim 1, characterized in that, The two-shot stationary mold includes a second boss structure, which is used to restrict the horizontal movement of the angled ejector during the two-shot injection molding process.

9. The two-color injection mold according to claim 1, characterized in that, The inclined ejector head cooperates with the moving mold to form the side of the undercut structure having a forming part. The angle formed between the side of the undercut structure formed by the inclined ejector head and the demolding direction is equal to the first angle. The angle formed between the forming part and the demolding direction is equal to the first angle.

10. The two-color injection mold according to claim 1, characterized in that, The angle between the side of the inclined ejector head away from the undercut structure of the injection molded part and the demolding direction is 3-5° larger than the second angle.

Images