An injection-molding-based built-in structural member type molding mold and molding method

Abstract

The application relates to the technical field of injection molding, and discloses an injection-molding-based built-in structural part type forming die and a forming method. The injection-molding-based built-in structural part type forming die comprises a lower die and an upper die, a cavity, a first runner and a plurality of fan-shaped communication openings are formed between the lower die and the upper die, and the first runner is arranged on the outer side of the cavity. Through the arrangement of the first runner and the fan-shaped communication openings, liquid silicone can be uniformly flowed into the cavity, the silicone can be uniformly coated around the structural part, and the problems of insufficient local filling or excessive thickness can be avoided. The step-by-step preforming and low-pressure filling process is adopted, the upper half shell and the lower half shell are preformed as rigid barriers, the damage risk of high-pressure silicone solidification to the precise structural part is completely eliminated, the product performance and the yield are improved, the size precision and the functional integrity of the structural part are guaranteed, the yield and the reliability are remarkably improved, and the method can be applied to high-precision and high-value structural parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding, in particular to an injection molding-based built-in structure piece type forming mold and forming method. BACKGROUND

[0002] Injection molding technology is a highly efficient plastic processing method, which is to inject molten plastic raw materials into a closed mold cavity through the screw or plunger of an injection machine at high pressure, and then take out the product consistent with the shape of the mold cavity after cooling and solidification. This technology has the characteristics of high production efficiency, one-time forming of complex shapes, and high dimensional accuracy of products, and is widely used in many fields such as automobiles, electronics, medical devices, daily necessities, etc. It is one of the most commonly used molding processes in modern plastic industry.

[0003] The common method for preparing a structure piece wrapped with silicone through injection molding technology usually has two kinds: one is to place the structure piece on the mold and fix it (the structure piece is provided with a positioning point), and then inject liquid silicone to form a whole encapsulation structure to realize the encapsulation of the structure piece. The other is to first form a silicone half, place the structure piece on it, and then inject liquid silicone to form the other half and combine with the structure piece and the first half at the same time.

[0004] However, the existing process has the following defects: the liquid silicone is injected by the injection molding machine, which generates high-pressure injection force, and the silicone solidification generates internal volume shrinkage pressure and thermal expansion force; this pressure directly acts on the wrapped structure piece, causing the structure piece to deform or displace, resulting in damage or failure of the internal precision components (such as sensors, optical elements, microelectronic devices) of the structure piece. The residual stress at the interface between the silicone and the structure piece affects the long-term reliability and sealing. The deformation and displacement caused by the pressure reduce the product yield and dimensional accuracy.

[0005] Therefore, it is necessary to provide an injection molding-based built-in structure piece type forming mold and forming method to solve the above technical problems. SUMMARY

[0006] The purpose of the present application is to provide an injection molding-based built-in structure piece type forming mold and forming method, which is to eliminate or significantly reduce the pressure exerted by liquid silicone on the internal structure piece during the forming and solidification process, thereby protecting the integrity of the structure piece, improving the product accuracy and yield, and expanding the application of the silicone encapsulation process on precision and sensitive structure pieces.

[0007] The technical purposes are achieved by the following technical solutions: an injection molding based built-in structure piece type molding mold, comprising a lower mold and an upper mold, a cavity, a first runner and a plurality of fan-shaped communication openings are formed between the lower mold and the upper mold, the first runner is arranged outside the cavity, the first runner is communicated with the cavity through the plurality of fan-shaped communication openings, the first runner is a closed loop structure, a gate one is arranged on the upper mold, a main runner one is arranged between the upper mold and the lower mold, and the gate one is communicated with the main runner one.

[0008] Further, the structure piece is arranged in the cavity during injection molding, an upper half shell is arranged above the structure piece, a lower half shell is arranged below the structure piece, and the structure piece is covered inside the upper half shell and the lower half shell.

[0009] Further, a silica gel inner sleeve is arranged on the surface of the structure piece, a gap is arranged between the upper half shell and the lower half shell, the gap is a closed loop structure, and the gap is communicated with the fan-shaped communication opening.

[0010] Further, a material overflow well is arranged on the lower mold, and an inner wall of the first runner is provided with a slope.

[0011] Further, an inner mold is arranged between the upper mold and the lower mold, the inner mold can be removed from between the upper mold and the lower mold, the shape of the inner mold is the same as that of the structure piece, a blocking part is fixedly arranged on the edge of the inner mold, the structure of the blocking part is the same as that of the gap between the upper half shell and the lower half shell, when the upper mold and the lower mold are closed, the inner mold and the blocking part divide the cavity into two upper and lower molding cavities, and the structures of the two molding cavities are the same as those of the upper half shell and the lower half shell respectively.

[0012] Further, a support plate is fixedly arranged on the side wall of the inner mold, a through groove is arranged between the upper mold and the lower mold for the support plate to extend into, and the through groove is blocked by a blocking assembly when the inner mold is removed from between the upper mold and the lower mold.

[0013] Further, the blocking assembly comprises a spring and a blocking block, a sliding groove and a mounting cavity are arranged on the upper mold, the bottom of the sliding groove is provided with an opening, the mounting cavity is arranged above the sliding groove and is communicated with the sliding groove, the blocking block is slidably arranged in the sliding groove, the spring is arranged in the mounting cavity, the bottom end of the spring is fixedly connected with the blocking block, and the top end of the spring is fixedly connected with the top inner wall of the mounting cavity, when the inner mold is removed from between the upper mold and the lower mold, the blocking block moves downward into the through groove under the elastic action of the spring, so that the through groove is closed.

[0014] Further, the support plate is internally provided with a main runner two, and the end of the support plate away from the inner mold of the mold is provided with a gate two in communication with the main runner two; a plurality of branch runners two are formed on the inner mold of the mold; and a branch cavity is arranged in the middle of the inner mold of the mold, the main runner two is in communication with the branch cavity, and the plurality of branch runners two are in communication with the branch cavity.

[0015] Further, the end of the branch runner two away from the inner mold of the mold is provided with a tapered mouth, and the tapered mouth is sleeved with an electric heating ring.

[0016] A low-pressure silicone overmolding method for a structure part, using the structure part type forming mold based on injection molding in any of the above, comprising the following steps:

[0017] S1. Forming two complete and shape-matched upper and lower half shells of silicone material in separate mold cavities;

[0018] S2. Placing the structure part to be overmolded at a predetermined position of the lower half shell or the upper half shell, and then aligning and closing the upper half shell and the lower half shell together with the structure part between the upper mold and the lower mold of the mold, at this time, the structure part is completely wrapped in the middle of the pre-formed upper half shell and the lower half shell, forming a sandwich structure containing the structure part and a gap;

[0019] S3. After the mold upper mold and the mold lower mold are closed, liquid silicone with the same or compatible material as the upper half shell and the lower half shell is injected into the gap between the upper half shell and the lower half shell, so that the upper half shell, the lower half shell and the injected silicone can be more closely bonded or filled, and then low-pressure, low-temperature or room temperature curing is performed;

[0020] S4. After curing is completed, the mold upper mold and the mold lower mold are separated for demolding.

[0021] In summary, the present application has the following beneficial effects:

[0022] 1. The present application realizes uniform flow of liquid silicone into the mold cavity through the arrangement of the branch runner one and the fan-shaped communication port, ensures uniform overmolding of silicone around the structure part, and avoids local underfilling or overfilling; the silicone inner sleeve prevents liquid silicone from penetrating into the structure part, protecting the precision components; the step-by-step preforming and low-pressure filling process uses the preformed upper half shell and lower half shell as a rigid barrier to completely eliminate the risk of damage to the precision structure part caused by high pressure of silicone curing, improves product performance and yield, guarantees the dimensional accuracy and functional integrity of the structure part, significantly improves the yield and reliability, and can be applied to high-precision and high-value structure parts.

[0023] 2、the second embodiment of the present application, by the setting of the mold inner mold, the work which originally needs three sets of mold to complete is integrated into a set of mold, effectively reduces the mold cost, the mold inner mold can be removed, when producing the upper shell and the lower shell, the forming cavity formed by it is used to complete the forming, and the original mold cavity can be used when the subsequent structure is coated; the blocking assembly ensures that the through slot is closed after the mold inner mold is removed, prevents the leakage of liquid silicone, and ensures the continuity and stability of production; in addition, the design of the support plate inner main runner two, the runner two and the related gate, the shunt cavity realizes the effective transportation and filling of the liquid silicone; the setting of the tapered port, the electric heating ring, the electric heating pipe one and the electric heating pipe two facilitates demolding, prevents the flow channel from being blocked, further optimizes the production process, and improves the production efficiency and product quality. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic diagram of the first embodiment of the present application;

[0025] Figure 2 It is a structure schematic diagram of the lower mold of the first embodiment of the present application;

[0026] Figure 3 It is a structure schematic diagram of the first embodiment of the present application when the mold is closed;

[0027] Figure 4 It is a cross-sectional structure schematic diagram of the upper shell, the lower shell and the structure of the present application;

[0028] Figure 5 It is a structure schematic diagram of the upper shell, the lower shell and the gap of the present application;

[0029] Figure 6 It is a split structure schematic diagram of the upper shell, the lower shell and the structure of the present application;

[0030] Figure 7 It is a cross-sectional structure schematic diagram of the second embodiment of the present application;

[0031] Figure 8 It is an enlarged structure schematic diagram of A of the present application; Figure 7

[0032] Figure 9 It is a cross-sectional structure schematic diagram of the mold inner mold and the support plate of the second embodiment of the present application;

[0033] Figure 10 It is an enlarged structure schematic diagram of B of the present application. Figure 9

[0034] ​​In the figure: 1, lower mold; 101, first runner; 102, main runner; 103, overflow well; 104, slope; 105, fan-shaped communication port; 2, upper mold; 201, first gate; 202, chute; 203, mounting cavity; 3, upper half shell; 4, lower half shell; 5, structural part; 6, gap; 7, silica gel inner sleeve; 8, inner mold; 801, second runner; 802, tapered port; 803, distribution cavity; 9, support plate; 901, second gate; 902, main runner; 903, connecting part; 10, blocking part; 11, blocking block; 12, spring; 13, first electric heating tube; 14, second electric heating tube; 15, electric heating ring. DETAILED DESCRIPTION

[0035] The present application will be further described below with reference to the accompanying drawings of the embodiments of the present application.

[0036] Please refer to Figures 1-6 In the embodiments of the present application, a built-in structural part type forming mold based on injection molding comprises a lower mold 1 and an upper mold 2, a mold cavity, a first runner 101 and a plurality of fan-shaped communication ports 105 are formed between the lower mold 1 and the upper mold 2, the first runner 101 is arranged around the outside of the mold cavity, the first runner 101 is connected with the mold cavity through the plurality of fan-shaped communication ports 105, the first runner 101 is a closed loop structure, the upper mold 2 is provided with a first gate 201, a main runner 102 is arranged between the upper mold 2 and the lower mold 1, and the first gate 201 is connected with the main runner 102; through the cooperation of the closed loop structure of the first runner 101 and the plurality of fan-shaped communication ports 105, the injected liquid silica gel can flow more uniformly into the mold cavity, ensuring that the silica gel uniformly covers around the structural part 5, avoiding the occurrence of local underfilling or overfilling, and thus improving the consistency and stability of product forming.

[0037] In the embodiments, preferably, the lower mold 1 is provided with an overflow well 103, which is used for storing cold material and overflow material, mainly for intercepting cold material generated during injection molding to prevent it from entering the mold cavity and causing defects in the product, accommodating excess overflow material to protect the mold, and assisting in discharging gas in the mold cavity to ensure product forming quality and improve production efficiency; specifically, during injection molding, if the cold material generated due to temperature changes and other factors enters the mold cavity, it will cause defects such as cold spots and depressions on the surface of the product, and if the excess overflow material is not accommodated in time, it will cause excessive pressure on the mold, affecting the service life of the mold, and the existence of the overflow well 103 effectively solves these problems, by storing cold material and overflow material, maintaining stable pressure in the mold cavity, and in terms of gas discharge, the air in the mold cavity can be discharged through the overflow well 103 along the flow direction of the liquid silica gel, avoiding the generation of bubbles, cavities and other adverse phenomena due to gas residues, thereby significantly improving the yield of the product.

[0038] In this embodiment, preferably, the inner side wall of the flow distribution channel 101 is provided with a slope 104. The slope 104 is designed by using the principle of physical mechanics. When the workpiece is cooled and formed, and the demolding force is applied in the direction of the slope 104 during the demolding process, the slope 104 can decompose the demolding resistance perpendicular to the surface of the mold into a component force in the direction of the slope 104, thereby reducing the friction between the workpiece and the mold, and reducing the difficulty of demolding. Compared with the mold without the slope 104, the flow distribution channel 101 with the slope 104 can greatly reduce the demolding time and the risk of damage to the workpiece during the demolding process, and improve the production efficiency and product quality.

[0039] In this embodiment, preferably, during injection molding, the structural part 5 is arranged in the mold cavity, the upper half shell 3 is arranged above the structural part 5, the lower half shell 4 is arranged below the structural part 5, the structural part 5 is covered inside the upper half shell 3 and the lower half shell 4, the surface of the structural part 5 is sleeved with a silica gel inner sleeve 7, the gap 6 is arranged between the upper half shell 3 and the lower half shell 4, the gap 6 is a closed loop structure, and the gap 6 is connected with the fan-shaped communication port 105; The inside of the structural part 5 is provided with a battery assembly, a PCB assembly, and precision devices, etc. The silica gel inner sleeve 7 plays a barrier role. Since the battery assembly, the PCB assembly, and the precision devices inside the structural part 5 have very high environmental requirements, if the molten silica gel penetrates, it will cause short circuit, component damage and other serious consequences. The sealing property of the silica gel inner sleeve 7 ensures that during the injection molding process, the liquid silica gel can only flow in the preset gap 6 and the molding area, and will not damage the precision components inside the structural part 5, effectively protecting the functional integrity and reliability of the structural part 5.

[0040] In specific use, two-step independent preforming is adopted: firstly, two complete and shape-matched upper half shells 3 and lower half shells 4 made of silica gel material are respectively formed in independent mold cavities, and the upper half shells 3 and the lower half shells 4 are not provided with internal structural parts 5 during forming, so that the forming pressure and the solidification shrinkage will not affect the structural parts 5 in the final product; then, the structural parts 5 to be covered are placed at the predetermined positions of the lower half shells 4 or the upper half shells 3, and the upper half shells 3 and the lower half shells 4 are aligned and folded together with the structural parts 5 in the forming mold, at this time, the structural parts 5 are completely wrapped in the middle by the preformed semi-rigid silica gel upper half shells 3 and lower half shells 4, forming a sandwich structure containing the structural parts 5 and a small gap 6; so that the upper half shells 3 and the lower half shells 4 become a rigid barrier to protect the structural parts 5, so that the upper half shells 3 and the lower half shells 4 can protect the internal structural parts 5 during injection molding, completely eliminating the risk of damage to the precise and vulnerable structural parts 5 caused by high pressure of silica gel solidification, improving product performance and yield, protecting the size accuracy and functional integrity of the structural parts 5, significantly improving product yield and reliability, allowing the silica gel covering process to be used for high-precision and high-value structural parts 5 (such as MEMS sensors, precision optical elements, microelectronic components, etc.) that cannot withstand pressure in the past, the low-pressure filling step may allow the use of normal or low-temperature curing silica gel, reducing energy consumption and shortening part of the cycle time; during injection molding, liquid silica gel with the same or compatible material as the upper half shells 3 and the lower half shells 4 is injected into the small gap 6 between the upper half shells 3 and the lower half shells 4, and the necessary gap 6 between the half shells and the structural parts 5, so that the upper half shells 3, the lower half shells 4 and the injected silica gel can be more tightly bonded or filled, and then low-pressure, low-temperature or normal-temperature curing is performed;

[0041] This two-step preforming and low-pressure filling process revolutionizes the traditional silica gel covering method. In the traditional process, the structural parts 5 are directly placed in the mold for silica gel injection molding, which may cause irreversible damage to the precise structural parts 5 due to the high pressure generated during silica gel solidification, limiting the application of the silica gel covering process in the high-precision field. The present application provides a buffer and protection for the structural parts 5 by preforming the upper half shells 3 and the lower half shells 4, and even if pressure is generated during silica gel solidification during the low-pressure filling process, it will be dispersed and absorbed by the half shells, and will not be transmitted to the structural parts 5. In addition, the low-pressure, low-temperature or normal-temperature curing method not only reduces energy consumption and operating costs during production, but also avoids the influence of high temperature on the material properties of the structural parts 5, while shortening the curing time, accelerating the production cycle and improving the market competitiveness of the enterprise.

[0042] The application also discloses a low-pressure silica gel covering forming method for wrapping structural parts, which comprises the following steps:

[0043] S1. Two complete and shape-matched upper half shells 3 and lower half shells 4 made of silica gel material are respectively formed in independent mold cavities;

[0044] S2. Put the structure 5 to be coated in the predetermined position of the lower half shell 4 or the upper half shell 3, and then align and close the upper half shell 3 and the lower half shell 4 together with the structure 5 between the upper mold 2 and the lower mold 1, at this time, the structure 5 is completely wrapped in the middle of the pre-formed upper half shell 3 and the lower half shell 4, forming a sandwich structure containing the structure 5 and the gap 6;

[0045] S3. After the upper mold 2 and the lower mold 1 are closed, inject liquid silicone with the same or compatible material as the upper half shell 3 and the lower half shell 4 into the gap 6 between the upper half shell 3 and the lower half shell 4, so that the upper half shell 3, the lower half shell 4 and the injected silicone can be more closely bonded or filled, and then low pressure, low temperature or room temperature curing is carried out;

[0046] S4. After curing is completed, separate the upper mold 2 and the lower mold 1 for demolding.

[0047] Because the upper half shell 3 and the lower half shell 4 need to be produced independently, the mold for preparing the upper half shell 3 and the lower half shell 4 also needs to be equipped, so three sets of molds are needed to complete the production process, which increases the cost of the mold, therefore, this embodiment is set.

[0048] Please refer to Figures 7-10The mold inner mold 8 is arranged between the mold upper mold 2 and the mold lower mold 1, can be removed from between the mold upper mold 2 and the mold lower mold 1, has the same shape and structure as the structural part 5, and is fixedly provided with a blocking part 10 at an edge portion; the blocking part 10 has the same structure as the gap 6 between the upper half shell 3 and the lower half shell 4; when the mold upper mold 2 and the mold lower mold 1 are closed, the mold inner mold 8 and the blocking part 10 divide the mold cavity into two forming cavities, and the structures of the two forming cavities are respectively the same as those of the upper half shell 3 and the lower half shell 4; a support plate 9 is fixedly installed on a side wall of the mold inner mold 8, a through groove is arranged between the mold upper mold 2 and the mold lower mold 1 for the support plate 9 to extend into, and a blocking assembly for blocking the through groove is arranged in the mold upper mold 2; when the mold inner mold 8 is removed from between the mold upper mold 2 and the mold lower mold 1, the blocking assembly blocks the through groove; the blocking assembly comprises a spring 12 and a blocking block 11; a sliding groove 202 and a mounting cavity 203 are arranged on the mold upper mold 2; the bottom of the sliding groove 202 is open; the mounting cavity 203 is arranged above the sliding groove 202 and communicates with the sliding groove 202; the blocking block 11 is slidably installed in the sliding groove 202; the spring 12 is arranged in the mounting cavity 203; the bottom end of the spring 12 is fixedly connected with the blocking block 11; the top end of the spring 12 is fixedly connected with the top inner wall of the mounting cavity 203; when the mold inner mold 8 is removed from between the mold upper mold 2 and the mold lower mold 1, under the elastic action of the spring 12, the blocking block 11 moves downward into the through groove, thereby closing the through groove; through the arrangement of the mold inner mold 8, the work originally completed by three sets of molds is integrated into one set of mold, the mold cost is effectively reduced, the removable characteristic of the mold inner mold 8 enables the forming cavities formed by the mold inner mold 8 and the blocking part 10 to complete the forming work when the upper half shell 3 and the lower half shell 4 are produced, and when the structural part 5 is subsequently coated with silica gel, the mold inner mold 8 is only removed, and the original mold cavity can be used for operation; the design of the blocking assembly ensures that the through groove can be effectively closed after the mold inner mold 8 is removed, prevents liquid silica gel from leaking, and ensures the continuity and stability of the entire production process.

[0049] In the embodiment, preferably, the inner part of the support plate 9 is provided with a main runner two 902, and the end of the support plate 9 away from the mold inner mold 8 is provided with a gate two 901 in communication with the main runner two 902, and the gate two 901 is in communication with the molten plastic output end of the injection molding machine. When the upper half shell 3 and the lower half shell 4 are prepared by using the embodiment, the gate one 201 is closed and not used. A plurality of branch runners two 801 are arranged on the mold inner mold 8, and a branch cavity 803 is arranged in the middle of the mold inner mold 8. The main runner two 902 is in communication with the branch cavity 803, and the plurality of branch runners two 801 are in communication with the branch cavity 803. The ends of the plurality of branch runners two 801 away from the branch cavity 803 are in communication with two forming cavities. The forming cavity refers to the cavity formed between the mold inner mold 8, the mold upper mold 2 and the mold lower mold 1. When the upper half shell 3 and the lower half shell 4 are prepared, the liquid silicone is input through the gate two 901. The liquid silicone enters the branch cavity 803 through the main runner two 902, and then enters the two forming cavities through the plurality of branch runners two 801, so that the two forming cavities are filled with liquid silicone. After cooling and forming, the upper half shell 3 and the lower half shell 4 can be taken out of the mold.

[0050] In the embodiment, preferably, the end of the support plate 9 away from the mold inner mold 8 is provided with a connecting part 903, and the connecting part 903 is connected with a driving mechanism to drive the mold inner mold 8 to move, so that the mold inside can be automatically moved out of or into the mold.

[0051] In the embodiment, preferably, the end of the support plate 9 away from the mold inner mold 8 is provided with a connecting part 903, and the connecting part 903 is connected with a driving mechanism to drive the mold inner mold 8 to move, so that the mold inside can be automatically moved out of or into the mold.

[0052] In the embodiment, preferably, the inner part of the support plate 9 is provided with an electric heating tube one 13, and the electric heating tube one 13 is a spiral structure. The main runner two 902 is arranged on the inner side of the electric heating tube one 13. The inner part of the mold inner mold 8 is provided with a plurality of electric heating tubes two 14, and the electric heating tubes two 14 are spiral structures. The branch runner two 801 is arranged on the inner side of the electric heating tube. Through the arrangement of the electric heating tube one 13 and the electric heating tube two 14, the silicone in the main runner two 902 and the branch runner two 801 can be heated to prevent the silicone from solidifying and causing the runner to be blocked.

[0053] The above only describes the preferred embodiments of the present application, and any equivalent changes or modifications made according to the structure, features and principles described in the patent application range of the present application are included in the patent application range of the present application.

Claims

1. An injection-molding-based built-in structural part forming mold comprising a lower mold (1) and an upper mold (2), a mold cavity, a first runner (101), and a plurality of fan-shaped communication ports (105) being formed between the lower mold (1) and the upper mold (2), characterized in that: The first flow channel (101) is arranged outside the mold cavity, and the first flow channel (101) is connected with the mold cavity through a plurality of fan-shaped communication openings (105). The first flow channel (101) is a closed loop structure. The upper mold (2) is provided with a first gate (201). The main flow channel (102) is arranged between the upper mold (2) and the lower mold (1). The first gate (201) is connected with the main flow channel (102). When injection molding, the structural part (5) is arranged in the mold cavity. The upper half shell (3) is arranged above the structural part (5). The lower half shell (4) is arranged below the structural part (5). The structural part (5) is covered inside the upper half shell (3) and the lower half shell (4). The surface of the structural part (5) is sleeved with a silica gel inner sleeve (7). The gap (6) is arranged between the upper half shell (3) and the lower half shell (4). The gap (6) is a closed loop structure. The gap (6) is connected with the fan-shaped communication opening (105). The inner mold (8) is arranged between the upper mold (2) and the lower mold (1). The inner mold (8) can be removed from between the upper mold (2) and the lower mold (1). The shape of the inner mold (8) is the same as that of the structural part (5). The edge of one end of the inner mold (8) is fixedly provided with a sealing part (10). The structure of the sealing part (10) is the same as that of the gap (6) between the upper half shell (3) and the lower half shell (4). When the upper mold (2) and the lower mold (1) are closed, the inner mold (8) and the sealing part (10) divide the mold cavity into two upper and lower forming cavities. The structures of the two forming cavities are the same as those of the upper half shell (3) and the lower half shell (4) respectively. The side wall of the other end of the inner mold (8) is fixedly provided with a support plate (9). The support plate (9) is arranged to extend into a through groove arranged between the upper mold (2) and the lower mold (1). The inner part of the upper mold (2) is provided with a sealing assembly for sealing the through groove. When the inner mold (8) is removed from between the upper mold (2) and the lower mold (1), the sealing assembly seals the through groove. The sealing assembly comprises a spring (12) and a sealing block (11). The upper mold (2) is provided with a sliding groove (202) and a mounting cavity (203). The bottom of the sliding groove (202) is provided with an opening. The mounting cavity (203) is arranged above the sliding groove (202) and is connected with the sliding groove (202). The sealing block (11) is slidably arranged in the sliding groove (202). The spring (12) is arranged in the mounting cavity (203). The bottom end of the spring (12) is fixedly connected with the sealing block (11). The top end of the spring (12) is fixedly connected with the inner wall of the top of the mounting cavity (203). When the inner mold (8) is removed from between the upper mold (2) and the lower mold (1), the sealing block (11) moves downward into the through groove under the elastic action of the spring (12), so as to seal the through groove.

2. An injection-molding-based built-in structural member type molding mold according to claim 1, characterized by: The lower mold (1) is provided with a overflow well (103). The inner side wall of the first flow channel (101) is provided with a slope (104).

3. The injection-molding-based built-in structural part type molding mold according to claim 1, characterized by: The inside of the support plate (9) is provided with a main runner two (902), and the end of the support plate (9) away from the mold inner mold (8) is provided with a gate two (901) in communication with the main runner two (902), a plurality of branch runners two (801) are arranged on the mold inner mold (8), and a branch cavity (803) is arranged in the middle of the mold inner mold (8), the main runner two (902) is in communication with the branch cavity (803), and the plurality of branch runners two (801) are in communication with the branch cavity (803).

4. An injection-molding-based built-in structural part type molding mold according to claim 3, characterized by: The end of the branch runner two (801) away from the mold inner mold (8) is provided with a tapered port (802), and the tapered port (802) is sleeved with an electric heating ring (15).

5. An injection-molding-based built-in structural member molding method using the injection-molding-based built-in structural member molding mold according to any one of claims 1 to 4, characterized by, The method comprises the following steps: S1. Form two complete and shape-matched upper half shells (3) and lower half shells (4) made of silica gel in separate mold cavities; S2. Place the structure (5) to be covered at a predetermined position of the lower half shell (4) or the upper half shell (3), and then align and close the upper half shell (3) and the lower half shell (4) together with the structure (5) between the mold upper die (2) and the mold lower die (1), at this time, the structure (5) is completely wrapped in the middle of the preformed upper half shell (3) and the lower half shell (4), forming a sandwich structure containing the structure (5) and the gap (6); S3. After the mold upper die (2) and the mold lower die (1) are closed, inject liquid silica gel with the same or compatible material as the upper half shell (3) and the lower half shell (4) into the gap (6) between the upper half shell (3) and the lower half shell (4), so that the upper half shell (3), the lower half shell (4) and the injected silica gel can be more closely bonded or filled, and then low-pressure, low-temperature or room-temperature curing is carried out; S4. After curing is completed, separate the mold upper die (2) and the mold lower die (1) to perform demolding.

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