Injection mold with double-layer product glue feeding

Abstract

The utility model discloses a kind of injection mould of double-layer product glue feeding, it is related to injection mould technical field, including mould kernel structure, the mould kernel structure includes middle layer mould kernel, and upper layer mould kernel is butted with middle layer mould kernel upper end face and cooperates, and lower layer mould kernel is butted with middle layer mould kernel lower end face and cooperates, the upper layer mould kernel and middle layer mould kernel are butted with cooperation and form first mould cavity, the lower layer mould kernel and middle layer mould kernel are butted with cooperation and form second mould cavity;The mould kernel structure is provided with injection runner, and the injection runner includes main runner being set in upper layer mould kernel, first shunt being set in upper layer mould kernel and middle layer mould kernel, and second shunt being set in lower layer mould kernel and middle layer mould kernel, the first shunt is butted with first mould cavity, the second shunt is butted with second mould cavity, wherein the first shunt is also mutually communicated with second shunt, and the first shunt is communicated with main runner;Product defect caused by filling time difference or pressure difference can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold for double-layer product injection. Background Technology

[0002] In modern manufacturing, injection molding technology is widely used in various fields such as automobiles, electronics, home appliances, and medical devices due to its advantages of high efficiency, low cost, and the ability to mass-produce complex structural products. As the market continues to demand more integrated product functions, lightweight structures, and refined appearances, injection molded products with double-layer structures are increasingly expanding their application scenarios due to their ability to achieve functional layering and complementary performance. For example, the demand for products such as double-layer seals, composite material shells, and layered functional components continues to grow.

[0003] The molding of double-layer injection molded products relies on special injection molds. The core technical challenge lies in how to achieve precise control of the injection into the two mold cavities to ensure the consistency of molding quality, structural integrity, and interlayer fit of the two layers. Traditional two-layer product injection molds typically employ two injection schemes: one uses independent dual main runners to supply material to the upper and lower cavities respectively. While this scheme allows for individual control of injection parameters for each cavity, it results in a complex mold structure, large space requirements for runner design, high mold manufacturing costs, increased mold opening and closing resistance, and significant challenges in synchronizing the dual main runners, leading to inconsistent molding cycles and dimensional deviations between the two layers. The other scheme uses a single main runner combined with a single-sided branch runner. This involves first supplying material to the upper cavity via the main runner, and then switching the runner to supply material to the lower cavity after the upper product is formed, or using a series runner to supply material to both cavities sequentially. While this simplifies the mold structure, it suffers from severe uneven material distribution. The cavity filled first is prone to over-pressurization and flash defects, while the cavity filled later may experience material shortages and shrinkage marks due to decreased melt temperature and pressure loss. Furthermore, the long melt residence time in the series runner system makes it susceptible to degradation, affecting product performance, and its low molding efficiency makes it difficult to meet the needs of mass production.

[0004] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] A double-layer injection mold for product injection includes a mold core structure, the mold core structure including a middle mold core, an upper mold core that is mated to the upper end face of the middle mold core, and a lower mold core that is mated to the lower end face of the middle mold core. The upper mold core and the middle mold core are mated to form a first mold cavity, and the lower mold core and the middle mold core are mated to form a second mold cavity. The mold core structure is provided with injection molding channels, which include a main channel in the upper mold core, a first branch channel in the upper and middle mold cores, and a second branch channel in the lower and middle mold cores. The first branch channel is connected to the first mold cavity, and the second branch channel is connected to the second mold cavity. The first branch channel is also connected to the second branch channel, and the first branch channel is connected to the main channel.

[0007] As a further embodiment of this utility model: a hot nozzle is installed on the upper mold core along its upper end face, and the lower end of the hot nozzle passes through the upper mold core and connects with the middle mold core; The main flow channel is formed inside the center of the hot nozzle, and a first flow channel is provided on the outer periphery and lower end of the hot nozzle. A second flow channel is provided on the lower end face of the upper mold core and / or the upper end face of the middle mold core. The first flow channel and the second flow channel are connected and cooperated in sequence to form the first branch flow channel. The second flow channel is connected to the first mold cavity.

[0008] As a further embodiment of this utility model: a mating part is installed along the lower end face of the lower mold core, and the upper end of the mating part passes through the lower mold core and connects with the middle mold cavity; The outer periphery and upper end of the mating part are provided with a third flow channel, and the upper end face of the lower mold core and / or the lower end face of the middle mold core are provided with a fourth flow channel. The third flow channel and the fourth flow channel are connected and mated in sequence to form the second sub-flow channel. The fourth flow channel is connected to the second mold cavity.

[0009] As a further embodiment of this utility model: the lower end of the hot nozzle is coaxially connected to the upper end of the mating part, and the first flow channel at the lower end of the hot nozzle is connected to the third flow channel at the upper end of the mating part at the docking point, so that the first flow channel and the second flow channel are connected through the docking point.

[0010] As a further embodiment of this utility model: the first flow channel and the third flow channel are symmetrically distributed vertically; The second and fourth flow channels are symmetrically distributed vertically.

[0011] As a further embodiment of this utility model: the first flow channel includes a first flow section horizontally disposed at the lower end of the hot nozzle, a second flow section inclinedly disposed on the outer peripheral wall of the hot nozzle, and a third flow section arcuately disposed on the outer peripheral wall of the hot nozzle; The two ends of the second flow segment are connected to the first flow segment and the third flow segment, respectively. The first flow segment is connected to the main flow channel, and the third flow segment is connected to the second flow channel.

[0012] As a further embodiment of this utility model: the third flow channel includes a fourth flow section horizontally disposed on the upper end of the mating part, a fifth flow section inclinedly disposed on the outer peripheral wall of the mating part, and a sixth flow section arcuately disposed on the outer peripheral wall of the mating part; The fifth flow segment is connected to the fourth flow segment and the sixth flow segment at both ends, respectively. The fourth flow segment is connected to the first connecting segment, and the sixth flow segment is connected to the fourth flow channel.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention, through the symmetrical distribution and structural design of the flow channels, ensures that the flow path length and resistance characteristics of the molten material remain consistent in the first and second flow channels. This ensures that the molten material enters the first and second mold cavities simultaneously with similar pressure and temperature, reducing product defects caused by differences in filling time or pressure. At the same time, the coaxial connection between the hot nozzle and the mating parts, and the segmented design of the flow channels (horizontal, inclined, and arc-shaped sections), reduce the flow resistance of the molten material in the flow channels, avoid eddies or stagnation, and ensure the fluidity and stability of the molten material.

[0014] Additional aspects and advantages of this 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

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the hot nozzle and the mating parts in this utility model; Figure 4 This is a schematic diagram of the structure of the heating nozzle in this utility model; Figure 5 This is a structural schematic diagram of the mating parts in this utility model.

[0017] The reference numerals and names in the figure are as follows: 1. Middle mold core; 2. Upper mold core; 3. Lower mold core; 4. First mold cavity; 5. Second mold cavity; 6. Main runner; 7. First branch runner; 8. Second branch runner; 9. Hot runner; 10. First runner; 11. Second runner; 12. Mating part; 13. Third runner; 14. Fourth runner; 15. First flow section; 16. Second flow section; 17. Third flow section; 18. Fourth flow section; 19. Fifth flow section; 20. Sixth flow section. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-5 In this embodiment of the utility model, a double-layer product injection mold is provided with a mold core structure and an injection runner. Through the layered cooperation of the mold core structure and the interconnection design of the injection runner, the synchronous injection molding of the double-layer product is realized.

[0020] The mold core structure includes a middle mold core 1, an upper mold core 2, and a lower mold core 3. The upper mold core 2 is mated to the upper end face of the middle mold core 1, and the mating surface of the two forms a first mold cavity 4 for molding the upper product. The lower mold core 3 is mated to the lower end face of the middle mold core 1, and the mating surface of the two forms a second mold cavity 5 for molding the lower product. The middle mold core 1 serves as the connecting carrier between the upper and lower mold cores 3, and its upper and lower end faces are respectively fitted with the corresponding end faces of the upper mold core 2 and the lower mold core 3 to ensure the sealing and structural stability of the first mold cavity 4 and the second mold cavity 5.

[0021] The injection molding runner system includes a main runner 6, a first branch runner 7, and a second branch runner 8, used to transport molten material from the injection molding equipment to the first mold cavity 4 and the second mold cavity 5. The main runner 6 is located in the upper mold core 2, with its upper end corresponding to the outlet of the injection molding equipment and its lower end connected to the first branch runner 7. The first branch runner 7 is jointly formed by the upper mold core 2 and the middle mold core 1. Specifically, a hot runner 9 is installed along the upper surface of the upper mold core 2, and the lower end of the hot runner 9 passes through the upper mold core 2 and connects with the upper surface of the middle mold core 1. A first runner 10 is provided on the outer periphery and lower end of the hot runner 9. A second runner 11 is provided on the lower surface of the upper mold core 2 and / or the upper surface of the middle mold core 1. The first runner 10 and the second runner 11 are connected sequentially to form the first branch runner 7, and the end of the second runner 11 connects with the first mold cavity 4, allowing the molten material to enter the first mold cavity 4 through the first branch runner 7.

[0022] The first runner 7 and the second runner 8 are interconnected. The second runner 8 is used to transport the molten material to the second mold cavity 5, and it is composed of the lower mold core 3 and the middle mold core 1. A mating part 12 is installed on the lower mold core 3 along its lower end face. The upper end of the mating part 12 passes through the lower mold core 3 and is in contact with the lower end face of the middle mold core 1. A third runner 13 is provided on the outer periphery and the upper end of the mating part 12. A fourth runner 14 is provided on the upper end face of the lower mold core 3 and / or the lower end face of the middle mold core 1. The third runner 13 and the fourth runner 14 are connected in sequence to form the second runner 8, and the end of the fourth runner 14 is in contact with the second mold cavity 5, so that the molten material can enter the second mold cavity 5 through the second runner 8.

[0023] To achieve the connection between the first branch channel 7 and the second branch channel 8, the lower end of the hot nozzle 9 is coaxially mated with the upper end of the mating part 12, forming a connecting node at their mating point. The first flow channel 10 at the lower end of the hot nozzle 9 is connected to the third flow channel 13 at the upper end of the mating part 12 at this mating point, thereby allowing the first branch channel 7 and the second branch channel 8 to converge and connect through this node. After the molten material enters from the main channel 6, it first flows into the initial section of the first branch channel 7, and then is simultaneously branched to the second branch channel 8 through the aforementioned connecting node, and is then conveyed to the first mold cavity 4 and the second mold cavity 5 respectively.

[0024] From the perspective of the flow channel structure, the first flow channel 10 and the third flow channel 13 are symmetrically distributed vertically, as are the second flow channel 11 and the fourth flow channel 14. This symmetrical design ensures that the flow path length and cross-sectional shape of the molten material remain consistent in the two flow channels, ensuring that the flow resistance of the molten material is the same, thereby achieving synchronous filling of the two mold cavities and ensuring the molding consistency of the double-layer product.

[0025] Specifically, the first flow channel 10 includes a first flow section 15 horizontally disposed at the lower end of the hot nozzle 9, a second flow section 16 inclinedly disposed on the outer peripheral wall of the hot nozzle 9, and a third flow section 17 arc-shapedly disposed on the outer peripheral wall of the hot nozzle 9. The first flow section 15 is horizontally designed, which allows the molten material to quickly turn after flowing vertically out of the main flow channel 6 and smoothly enter the subsequent flow sections, avoiding pressure loss due to sudden changes in direction. The second flow section 16 is inclined, which can adapt to the installation space layout of the hot nozzle 9 and the mold core, and at the same time guides the molten material to diffuse outward along the outer peripheral wall of the hot nozzle 9, realizing uniform distribution of the molten material. The third flow section 17 is arc-shaped, which can reduce eddies and stagnation of the molten material at the flow channel turning point, reduce flow resistance, and ensure the fluidity and temperature stability of the molten material. The two ends of the second flow section 16 are connected to the first flow section 15 and the third flow section 17, respectively. The first flow section 15 is connected to the lower end of the main flow channel 6, and the third flow section 17 is connected to the starting end of the second flow channel 11, forming a continuous flow channel path.

[0026] The third flow channel 13 includes a fourth flow section 18 horizontally positioned at the upper end of the mating component 12, a fifth flow section 19 inclinedly positioned on the outer peripheral wall of the mating component 12, and a sixth flow section 20 arc-shapedly positioned on the outer peripheral wall of the mating component 12. The fourth flow section 18 is symmetrical to the first flow section 15 and is horizontally positioned to ensure a stable flow direction of the molten material at the connecting node and avoid flow deviation. The fifth flow section 19 is symmetrical to the second flow section 16 and is inclinedly positioned to match the symmetrical layout of the second flow channel 11 and the fourth flow channel 14, ensuring the structural consistency of the upper and lower flow channels. The sixth flow section 20 is symmetrical to the third flow section 17 and is arc-shaped, which is also used to reduce the flow resistance of the molten material and avoid the generation of eddies. The two ends of the fifth flow section 19 are connected to the fourth flow section 18 and the sixth flow section 20 respectively. The fourth flow section 18 is connected to the first flow section 15 at the joint of the hot nozzle 9 and the mating part 12. The sixth flow section 20 is connected to the starting end of the fourth flow channel 14, forming a complete flow channel passage symmetrical to the first branch channel 7.

[0027] This invention, through the symmetrical distribution and structural design of the flow channels, ensures that the flow path length and resistance characteristics of the molten material remain consistent within the first and second flow channels 7 and 8. This ensures that the molten material enters the first mold cavity 4 and the second mold cavity 5 simultaneously with similar pressure and temperature, reducing product defects caused by differences in filling time or pressure. At the same time, the coaxial connection between the hot nozzle 9 and the mating part 12, and the segmented design of the flow channels (horizontal section, inclined section, and arc section), reduce the flow resistance of the molten material within the flow channels, avoid eddies or stagnation, and ensure the fluidity and stability of the molten material.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A double-layer injection mold for product injection, characterized in that, The mold core structure includes a middle mold core, an upper mold core that is mated to the upper end face of the middle mold core, and a lower mold core that is mated to the lower end face of the middle mold core. The upper mold core and the middle mold core are mated to form a first mold cavity, and the lower mold core and the middle mold core are mated to form a second mold cavity. The mold core structure is provided with injection molding channels, which include a main channel in the upper mold core, a first branch channel in the upper and middle mold cores, and a second branch channel in the lower and middle mold cores. The first branch channel is connected to the first mold cavity, and the second branch channel is connected to the second mold cavity. The first branch channel is also connected to the second branch channel, and the first branch channel is connected to the main channel.

2. The injection mold for double-layer product injection according to claim 1, characterized in that, A hot nozzle is installed on the upper mold core along its upper end face, and the lower end of the hot nozzle passes through the upper mold core and connects with the middle mold core. The main flow channel is formed inside the center of the hot nozzle, and a first flow channel is provided on the outer periphery and lower end of the hot nozzle. A second flow channel is provided on the lower end face of the upper mold core and / or the upper end face of the middle mold core. The first flow channel and the second flow channel are connected and cooperated in sequence to form the first branch flow channel. The second flow channel is connected to the first mold cavity.

3. The injection mold for double-layer product injection according to claim 2, characterized in that, The lower mold core is fitted with a mating part along its lower end face, and the upper end of the mating part passes through the lower mold core and connects with the middle mold cavity. The outer periphery and upper end of the mating part are provided with a third flow channel, and the upper end face of the lower mold core and / or the lower end face of the middle mold core are provided with a fourth flow channel. The third flow channel and the fourth flow channel are connected and mated in sequence to form the second sub-flow channel. The fourth flow channel is connected to the second mold cavity.

4. The injection mold for double-layer product injection according to claim 3, characterized in that, The lower end of the hot nozzle is coaxially mated with the upper end of the mating part. The first flow channel at the lower end of the hot nozzle is connected to the third flow channel at the upper end of the mating part at the mating point, so that the first and second flow channels are connected through the mating point.

5. The injection mold for double-layer product injection according to claim 3 or 4, characterized in that, The first flow channel and the third flow channel are symmetrically distributed vertically. The second and fourth flow channels are symmetrically distributed vertically.

6. The injection mold for double-layer product injection according to claim 3, characterized in that, The first flow channel includes a first flow section horizontally disposed at the lower end of the hot nozzle, a second flow section inclinedly disposed on the outer peripheral wall of the hot nozzle, and a third flow section arcuately disposed on the outer peripheral wall of the hot nozzle; The two ends of the second flow segment are connected to the first flow segment and the third flow segment, respectively. The first flow segment is connected to the main flow channel, and the third flow segment is connected to the second flow channel.

7. The injection mold for double-layer product injection according to claim 6, characterized in that, The third flow channel includes a fourth flow section horizontally disposed on the upper end of the mating part, a fifth flow section inclinedly disposed on the outer peripheral wall of the mating part, and a sixth flow section arcuately disposed on the outer peripheral wall of the mating part; The fifth flow segment is connected to the fourth flow segment and the sixth flow segment at both ends, respectively. The fourth flow segment is connected to the first connecting segment, and the sixth flow segment is connected to the fourth flow channel.

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