A double-color encapsulation mold for in-mold assembly of a super-thick plastic part with a cavity structure
Patent Information
- Application Number
- CN202522137812.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-10-10
AI Technical Summary
[0004]为了克服现有技术的不足，本实用新型提供一种超厚塑件空腔结构模内组装的双色包胶模具，以解决对超厚壁注塑制品直接包胶注塑时存在产品变形、收缩、外观质量、性能、生产成本和生产效率的问题
本实用新型通过设置第一注塑模具和第二注塑模具，注塑机将熔融的PP材料挤出并注射到第一注塑模具注塑成型一体状的第一注塑件和第二注塑件，形成一射产品，通过调节机械手抓取嵌件将其固定于一射产品的第二注塑件上形成半成品，此时半成品具有空腔，通过注塑机将熔融的PP材料挤出并注射到第二注塑模具在组装件的外表面注塑成型第三注塑件，形成成品，从而使钩部为空心状，可以减轻该双色包胶产品整体的重量，同时减少注塑材料的使用，从而节约生产成本，而且通过中空的设计降低了产品注塑成型后的冷却时间，提高了生产效率，同时大大减少了材料在固化过程中会发生过度收缩，导致表面凹陷、内部空洞等缩水现象，降低了注塑压力和注射量，从而降低注塑机的负荷，提高注塑效率，同时相对于注塑多个组件再对其进行组装的方式，避免了组装过程中的对产品的质量、性能的影响、生产成本高以及生产效率低等不良问题，提高了整体生产品质和效率。
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Figure CN224714302U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold technology, and in particular to a two-color overmolding mold for assembling ultra-thick plastic parts with a cavity structure. Background Technology
[0002] Injection molding is a method of shaping industrial products. Products are usually made using rubber injection molding and plastic injection molding. The wall thickness of injection molded products is generally 1-4mm. Injection molded products with a wall thickness exceeding 6mm are called thick-walled injection molded products, and those exceeding 10mm are called ultra-thick-walled injection molded products. Injection molding is the process of making various shapes of plastic products from thermoplastic or thermosetting materials using plastic molding molds. Injection molding is fast, efficient, and can be automated. It offers a wide variety of colors and shapes, from simple to complex, and sizes from large to small. Moreover, it produces precise product dimensions, facilitates product updates and replacements, and can create complex-shaped parts. Injection molding is suitable for mass production and molding processing of complex-shaped products.
[0003] Our company currently manufactures a type of hook product, such as... Figure 4 As shown, the first injection molded part 1 and the hook part are included. The diameter (thickness) of the hook part exceeds 10mm. When the injection mold is used to directly encapsulate the material, the hook part is a solid structure, which is prone to the following problems: (1) Deformation problem: The ultra-thick plastic PP material is large in size and has a large contact area with the mold. The thermal stress and shrinkage stress it is subjected to during the injection process are uneven, which can easily lead to deformation. On the other hand, the high injection temperature will soften the PP material, especially for the thick wall part. The heat transfer is uneven and the cooling rate is inconsistent, which will cause deformation. (2) Shrinkage problem: After the ultra-thick plastic PP material is encapsulated and injected, due to the long cooling time of the thick wall part, the material shrinks during the curing process. Excessive shrinkage will occur during the process, resulting in shrinkage phenomena such as surface depressions and internal voids. In addition, the difference in shrinkage rate between the overmolding material and the PP material may also exacerbate the shrinkage problem, causing defects such as deformation and cracking in the product; (3) Appearance quality problems: During the overmolding injection process of ultra-thick plastic PP material, appearance quality problems such as surface bubbles, flow marks, missing glue, and flash may occur; (4) Efficiency problems: Ultra-thick plastic PP material has a large volume and heavy weight, requiring a large injection pressure and injection volume during the injection process, which will increase the load on the injection molding machine and reduce the injection efficiency. In addition, due to the long cooling time of the thick-walled part, the molding cycle will also be extended accordingly, affecting production efficiency. Utility Model Content
[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with cavity structure, so as to solve the problems of product deformation, shrinkage, appearance quality, performance, production cost and production efficiency when directly overmolding ultra-thick wall injection molded products.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with a cavity structure, used to produce two-color overmolding products. The two-color overmolding product includes a first injection molded part, at least one second injection molded part is provided on the outer surface of the first injection molded part, an insert is fixed on the second injection molded part, the insert and the second injection molded part together form a cavity, and a third injection molded part is provided on the outer surface of the second injection molded part and the insert. The two-color overmolding mold includes: The first injection mold includes a first moving template and a first fixed template. The first fixed template includes two first Haval sliders, and the two first Haval sliders are respectively provided with a second protrusion and a second groove on one side facing each other. The second injection mold includes a second moving template and a second fixed template. The second fixed template includes two second Haval sliders, and each of the two second Haval sliders has a third groove on one side facing each other. The first protrusion is provided on both the first moving template and the second moving template, and the first protrusion is of the same size. The first fixed template and the second fixed template are both provided with a first groove, and the first groove and the second groove or the third groove are connected; When the first moving template and the first fixed template are closed, the gap between the first protrusion and the first groove is adapted to the size of the first injection molded part, the gap between the second protrusion and the second groove is adapted to the size of the second injection molded part, and the size of the two third grooves together is adapted to the size of the third injection molded part.
[0006] Preferably, the first moving template and the second moving template are both fixed to the top surface of a base plate, and the first fixed template and the second fixed template are both fixed to the bottom surface of a top plate. The first moving template and the second moving template have the same shape and size, and the base plate can be rotated so that the first moving template and the second moving template are located directly below the first fixed template and the second fixed template in sequence.
[0007] Preferably, the insert has the same outer contour size as the second injection molded part.
[0008] Preferably, the first fixed template includes a first fixed plate. The first fixed plate has a first trapezoidal bottom groove on the side facing the first moving template to accommodate two first Haval sliders. The first trapezoidal bottom groove includes two first inclined sides and two first vertical sides. The two first Haval sliders are the same size and the first vertical sides facing the first trapezoidal bottom groove are right-angled trapezoids. Each of the two first inclined sides of the first trapezoidal bottom groove is provided with a first limiting slider. The first inclined side of the first Haval slider is provided with a first sliding groove adapted to the first limiting slider. When the first Haval slider moves away from the first trapezoidal bottom groove along the first limiting slider, the two first Haval sliders move away from each other.
[0009] Preferably, the second fixed template includes a second fixed plate. The side of the second fixed plate facing the second fixed template has a second trapezoidal bottom groove for accommodating two second Haval sliders. The second trapezoidal bottom groove includes two second inclined sides and two second vertical sides. The two second Haval sliders are the same size, and the second vertical sides facing the second trapezoidal bottom groove are right-angled trapezoids. Each of the two second inclined sides of the second trapezoidal bottom groove is provided with a second limiting slider. The second inclined side of the second Haval slider is provided with a second sliding groove adapted to the second limiting slider. When the second Haval slider moves away from the second trapezoidal bottom groove along the second limiting slider, the two second Haval sliders move away from each other.
[0010] Preferably, the first groove includes two half-grooves of the same size, and at least one half-groove is opened on each side of the two first Haval sliders and the two second Haval sliders facing each other, and the two second Haval sliders are the same size.
[0011] Compared with the prior art, the beneficial effects that this utility model can achieve are: This invention utilizes a first and second injection mold. An injection molding machine extrudes molten PP material into the first mold to form an integral first and second injection molded part, creating a single-shot product. A robotic arm then grips and fixes an insert onto the second injection molded part of the single-shot product, forming a semi-finished product with a cavity. Molten PP material is then extruded into the second mold to form a third injection molded part on the outer surface of the assembly, creating the finished product. This design results in a hollow hook, reducing the overall weight of the two-color overmolded product and minimizing... The use of injection molding materials saves production costs, and the hollow design reduces the cooling time after injection molding, improving production efficiency. It also greatly reduces excessive shrinkage during the curing process, which can lead to surface depressions, internal voids, and other shrinkage phenomena. This reduces injection pressure and injection volume, thereby reducing the load on the injection molding machine and improving injection efficiency. Furthermore, compared to injection molding multiple components and then assembling them, it avoids the negative impacts on product quality and performance, high production costs, and low production efficiency that can occur during assembly, thus improving overall production quality and efficiency. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of a single-shot product of this utility model; Figure 2 This is a schematic diagram of the insert structure of this utility model; Figure 3 This is a schematic diagram of the third injection molded part of this utility model; Figure 4 This is a schematic diagram of the finished product structure of the two-color coated product of this utility model; Figure 5This is a schematic diagram of the structure of the first injection mold and the second injection mold of this utility model; Figure 6 This is a schematic diagram of the first or second moving template and the first protrusion structure of this utility model; Figure 7 This is a schematic diagram of the first fixed template structure of this utility model; Figure 8 This is a schematic diagram of the first Haval slider, the first limiting slider, the half-groove, and the second groove structure of this utility model; Figure 9 This is a schematic diagram of the structure of the first Haval slider, the first limiting slider, the half-groove, and the second protrusion of this utility model; Figure 10 This is a schematic diagram of the structure of the second injection mold of this utility model; Figure 11 This is a schematic diagram of the second Haval slider, the second limiting slider, the half-groove, and the third groove structure of this utility model; Wherein: 1. First injection molded part; 2. Second injection molded part; 3. Insert; 4. Third injection molded part; 5. First injection mold; 51. First moving template; 511. First protrusion; 52. First fixed template; 520. First fixing plate; 521. First groove; 5211. Half groove; 522. First Haval slider; 5221. Second groove; 5222. Second protrusion; 523. First limiting slider; 6. Second injection mold; 61. Second moving template; 62. Second fixed template; 620. Second fixing plate; 621. Second Haval slider; 6211. Third groove; 622. Second limiting slider. Detailed Implementation
[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model.
[0014] This utility model provides a two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with a cavity structure, used for producing two-color overmolded products, such as... Figures 1-4 As shown, the two-color overmolded product includes a first injection molded part 1, at least one second injection molded part 2 on the outer surface of the first injection molded part 1, an insert 3 fixed on the second injection molded part 2, the insert 3 and the second injection molded part 2 together forming a cavity, and a third injection molded part 4 on the outer surface of the second injection molded part 2 and the insert 3, as shown. Figure 5 As shown, the two-color overmolding mold includes a first injection mold 5 and a second injection mold 6; like Figures 6-9As shown, the first injection mold 5 includes a first moving template 51 and a first fixed template 52. The first fixed template 52 includes two first Haval sliders 522. The two first Haval sliders 522 are respectively provided with a second protrusion 5222 and a second groove 5221 on one side facing each other. like Figure 10 and Figure 11 As shown, the second injection mold 6 includes a second moving template 61 and a second fixed template 62. The second fixed template 62 includes two second Haval sliders 621. Each of the two second Haval sliders 621 has a third groove 6211 on one side facing each other. like Figure 6 As shown, both the first moving template 51 and the second moving template 61 are provided with first protrusions 511 of the same size; like Figure 8 , Figure 9 and Figure 11 As shown, a first groove 521 is provided on both the first fixed template 52 and the second fixed template 62, and the first groove 521 is connected to the second groove 5221 or the third groove 6211. When the first moving template 51 and the first fixed template 52 are closed, the gap between the first protrusion 511 and the first groove 521 is adapted to the size of the first injection molded part 1, the gap between the second protrusion 5222 and the second groove 5221 is adapted to the size of the second injection molded part 2, and the size of the two third grooves 6211 enclosed is adapted to the size of the third injection molded part 4. By setting up a first injection mold 5 and a second injection mold 6, the injection molding machine extrudes molten PP material and injects it into the first injection mold 5 to form an integral first injection molded part 1 and a second injection molded part 2, forming a single injection product. By adjusting the robot arm to grab the insert 3 and fix it onto the second injection molded part 2 of the single injection product to form a semi-finished product. At this time, the semi-finished product has a cavity. The injection molding machine extrudes molten PP material and injects it into the second injection mold 6 to injection mold a third injection molded part 4 on the outer surface of the assembly, forming a finished product, thus making the hook hollow. By setting the insert 3 and the second injection molded part 2 to form an assembly with a cavity, the overall weight of the two-color overmolded product can be reduced, and the amount of injection molding material used can be reduced, thereby saving production costs. Moreover, the hollow design reduces the cooling time after injection molding, improving production efficiency. It also greatly reduces the excessive shrinkage of the material during the curing process, which can lead to surface depressions, internal voids, and other shrinkage phenomena. This reduces the injection pressure and injection volume, thereby reducing the load on the injection molding machine and improving injection efficiency. Furthermore, compared to the method of injection molding multiple components and then assembling them, it avoids the adverse effects of assembly on product quality and performance, high production costs, and low production efficiency, thus improving overall production quality and efficiency.
[0015] The first moving template 51 and the second moving template 61 are both fixed to the top surface of a base plate (not shown in the figure), and the first fixed template 52 and the second fixed template 62 are both fixed to the bottom surface of a top plate (not shown in the figure). The first moving template 51 and the second moving template 61 are the same in shape and size. The base plate can be rotated so that the first moving template 51 and the second moving template 61 are located directly below the first fixed template 52 and the second fixed template 62 in sequence (this can be achieved by setting a motor to drive the base plate to rotate). The base plate and the top plate can move closer to or further away from each other. Specifically, this can be achieved by using a cylinder to drive the top plate to move closer to or further away from the base plate, thereby realizing the mold closing and mold opening actions (this is relative to the existing technology and will not be elaborated here). The mold closing and mold opening here includes the first moving template 51 or the second moving template 61 closing and opening with the first fixed template 52 or the second fixed template 62. By setting up a first moving template 51 and a second moving template 61 with the same shape, after the first injection molding of the product, the top plate can be adjusted to move away from the bottom plate, and then the bottom plate can be adjusted to rotate so that the first moving template 51 moves directly below the second fixed template 62. This allows for a quick second injection molding process. At the same time, the second moving template 61 moves directly below the first fixed template 52, and the first injection molding of the product can be performed simultaneously through the second moving template 61 and the first fixed template 52. This avoids the hassle of demolding the product after injection molding and then placing it in another injection mold, greatly improving processing efficiency.
[0016] like Figure 1 , Figure 2 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the insert 3 and the second injection molded part 2 have the same outer contour size. By setting the two to be the same size, and setting the first groove 521 to include two half-grooves 5211 of the same size, the two first Haval sliders 522 and the two second Haval sliders 621 are respectively opened with at least one half-groove 5211 on one side, so as to facilitate the production of two second Haval sliders 621 of the same size. The third groove 6211 is also the same size, which can also facilitate the production of two first Haval sliders 522 of the same size. Then, a second protrusion 5222 can be set in the second groove 5221 of one of the first Haval sliders 522.
[0017] like Figures 7-9As shown, the first fixed template 52 includes a first fixed plate 520. The first fixed plate 520 has a first trapezoidal bottom groove on the side facing the first moving template 51 to accommodate two first Haval sliders 522. The opening of the first trapezoidal bottom groove is the largest. The first trapezoidal bottom groove includes two first inclined sides and two first vertical sides. The two first Haval sliders 522 are the same size and the first vertical sides facing the first trapezoidal bottom groove are right-angled trapezoids. Each of the two first inclined sides of the first trapezoidal bottom groove is provided with a first limiting slider 523. The first inclined side of the first Haval slider 522 is provided with a first sliding groove adapted to the first limiting slider 523. When the first Haval slider 522 moves away from the first trapezoidal bottom groove along the first limiting slider 523, the two first Haval sliders 522 move away from each other (but the first Haval slider 522 will never leave the first trapezoidal bottom groove. Specifically, this can be achieved by setting the first limiting slider 523 to slide within the first sliding groove. This is relative to the prior art and will not be described in detail here). With this configuration, when the top plate is driven away from the bottom plate by adjusting the cylinder to achieve the mold opening action, the two first Haval sliders 522 will gradually move away from the first trapezoidal bottom groove due to their own weight, so that the two first Haval sliders 522 will move away from each other, thereby achieving a fast demolding action. In addition, to facilitate faster and more effective separation of the two first Haval sliders 522 after mold opening, an elastic element (not shown in the figure) can be set between the first Haval slider 522 and the first trapezoidal bottom groove. When the mold is closed, the elastic element is in a compressed state. When the mold is opened, the elastic element rebounds, thereby driving the two first Haval sliders 522 away from the first trapezoidal bottom groove. The two first Haval sliders 522 will move away from each other.
[0018] like Figure 10 and Figure 11 As shown, the second fixed template 62 includes a second fixed plate 620. The side of the second fixed plate 620 facing the second fixed template 62 has a second trapezoidal bottom groove to accommodate two second Haval sliders 621. The opening of the second trapezoidal bottom groove is the largest. The second trapezoidal bottom groove includes two second inclined sides and two second vertical sides. The two second Haval sliders 621 are the same size and the second vertical sides facing the second trapezoidal bottom groove are right-angled trapezoids. A second limiting slider 622 is provided on each of the two second inclined sides of the second trapezoidal bottom groove. A second sliding groove adapted to the second limiting slider 622 is provided on the second inclined side of the second Haval slider 621. When the second Haval slider 621 moves away from the second trapezoidal bottom groove along the second limiting slider 622, the two second Haval sliders 621 move away from each other (but the second Haval slider 621 will never leave the second trapezoidal bottom groove. Specifically, this can be achieved by setting the second limiting slider 622 to slide within the second sliding groove. This is relative to the prior art and will not be described in detail here). Similarly, when the top plate is driven away from the bottom plate by adjusting the cylinder to achieve the mold opening action, the two second Haval sliders 621 will gradually move away from the second trapezoidal bottom groove due to their own weight, so that the two second Haval sliders 621 will move away from each other, thereby achieving the rapid demolding action. In addition, to facilitate faster and more effective separation of the two second Haval sliders 621 after mold opening, an elastic element (not shown in the figure) can be set between the second Haval slider 621 and the second trapezoidal bottom groove. When the mold is closed, the elastic element is in a compressed state. When the mold is opened, the elastic element rebounds, thereby driving the two second Haval sliders 621 away from the second trapezoidal bottom groove. The two second Haval sliders 621 will move away from each other.
[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with hollow structures, characterized in that, For producing two-color overmolded products, the two-color overmolded products include a first injection molded part (1), the outer surface of the first injection molded part (1) is provided with at least one second injection molded part (2), an insert (3) is fixed on the second injection molded part (2), the insert (3) and the second injection molded part (2) together form a cavity, the outer surface of the second injection molded part (2) and the insert (3) is provided with a third injection molded part (4), the two-color overmolded mold includes: The first injection mold (5) includes a first moving template (51) and a first fixed template (52). The first fixed template (52) includes two first Haval sliders (522). The two first Haval sliders (522) are respectively provided with a second protrusion (5222) and a second groove (5221) on one side facing each other. The second injection mold (6) includes a second moving template (61) and a second fixed template (62). The second fixed template (62) includes two second Haval sliders (621). Each of the two second Haval sliders (621) has a third groove (6211) on one side facing each other. The first protrusion (511) is provided on both the first moving template (51) and the second moving template (61). The first fixed template (52) and the second fixed template (62) are each provided with a first groove (521), and the first groove (521) and the second groove (5221) or the third groove (6211) are connected; When the first moving template (51) and the first fixed template (52) are molded together, the gap between the first protrusion (511) and the first groove (521) is adapted to the size of the first injection molded part (1), the gap between the second protrusion (5222) and the second groove (5221) is adapted to the size of the second injection molded part (2), and the size of the two third grooves (6211) is adapted to the size of the third injection molded part (4).
2. The two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with cavity structure according to claim 1, characterized in that: The first movable template (51) and the second movable template (61) are both fixed to the top surface of a base plate, and the first fixed template (52) and the second fixed template (62) are both fixed to the bottom surface of a top plate. The first movable template (51) and the second movable template (61) have the same shape and size. The base plate can be rotated so that the first movable template (51) and the second movable template (61) are located directly below the first fixed template (52) and the second fixed template (62) in sequence.
3. The two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with cavity structure according to claim 2, characterized in that: The insert (3) has the same outer contour size as the second injection molded part (2).
4. The two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with cavity structure according to claim 2, characterized in that: The first fixed template (52) includes a first fixed plate (520). The first fixed plate (520) has a first trapezoidal bottom groove on the side facing the first moving template (51) to accommodate two first Haval sliders (522). The first trapezoidal bottom groove includes two first inclined sides and two first vertical sides. The two first Haval sliders (522) are the same size and the first vertical side facing the first trapezoidal bottom groove is a right trapezoid. The two first inclined sides of the first trapezoidal bottom groove are provided with first limiting sliders (523). The first inclined side of the first Haval slider (522) is provided with a first sliding groove that matches the first limiting slider (523). When the first Haval slider (522) moves away from the first trapezoidal bottom groove along the first limiting slider (523), the two first Haval sliders (522) move away from each other.
5. The two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with cavity structure according to claim 2, characterized in that: The second fixed template (62) includes a second fixed plate (620). The second fixed plate (620) has a second trapezoidal bottom groove on the side facing the second fixed template (62) to accommodate two second Haval sliders (621). The second trapezoidal bottom groove includes two second inclined sides and two second vertical sides. The two second Haval sliders (621) are the same size and the second vertical sides facing the second trapezoidal bottom groove are right-angled trapezoids. The two second inclined sides of the second trapezoidal bottom groove are provided with second limiting sliders (622). The second inclined sides of the second Haval sliders (621) are provided with second sliding grooves that are adapted to the second limiting sliders (622). When the second Haval sliders (621) move away from the second trapezoidal bottom groove along the second limiting sliders (622), the two second Haval sliders (621) move away from each other.
6. The two-color overmolding mold for in-mold assembly of ultra-thick plastic parts with cavity structure according to claim 2, characterized in that: The first groove (521) includes two half-grooves (5211) of the same size. The two first Haval sliders (522) and the two second Haval sliders (621) have at least one half-groove (5211) on one side facing each other. The two second Haval sliders (621) are the same size.