A bi-injection overmolding mold with in-mold shaping mechanism

Abstract

The utility model provides a kind of double injection encapsulation mould with in-mould shaping mechanism, including movable die assembly and fixed die assembly.When clamping, movable die assembly and fixed die assembly abut, and define a injection cavity and two injection cavities.Movable die assembly is equipped with in-mould opening shaping mechanism, and fixed die assembly is equipped with the elastic holding mechanism for holding one end of one injection product when encapsulating one injection product.In-mould opening shaping mechanism includes shaping block movably arranged beside two injection cavities, and driving assembly for driving shaping block.When clamping, movable die assembly drives driving assembly to act, to drive shaping block to extend into two injection cavities and shape the opening of one injection product in two injection cavities.Through the combination of above-mentioned in-mould synchronous shaping and encapsulation process, it avoids the problems of low production efficiency and cost increase caused by traditional post-shaping process, and significantly improves the dimensional accuracy and production stability of product.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a double-shot overmolding mold with an in-mold shaping mechanism. Background Technology

[0002] In the field of plastic product manufacturing, shell-type products with openings are prone to inward deformation during the cooling and shrinkage process after injection molding due to their multiple openings. This results in the opening size of the product being smaller than the design tolerance, which seriously affects the assembly accuracy and performance of the product.

[0003] Currently, the industry mainly employs pre-deformation and post-forming methods to address the aforementioned product opening deformation issues. The pre-deformation method involves, during the mold design phase, estimating the shrinkage and deformation trend of the product after cooling based on experience, and pre-designing a reverse compensation deformation amount at the corresponding part of the mold. However, determining the pre-deformation amount heavily relies on engineers' experience and repeated trial molding corrections, making precise quantitative control difficult. This results in long mold development cycles, high costs, and poor process stability, failing to meet the increasingly stringent production demands for dimensional accuracy.

[0004] The post-molding shaping method involves using specially designed shaping fixtures to reshape the openings of deformed products after demolding. This method requires additional shaping fixtures, increasing production costs. Furthermore, shaping as a separate process reduces overall production efficiency, increases production costs, and adds complexity to production management.

[0005] Therefore, the above problems urgently need to be solved. Utility Model Content

[0006] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a double-shot overmolding mold with an in-mold shaping mechanism. During the double-shot overmolding process, the opening of the first-shot product is simultaneously shaped with high precision, which solves the problem of product opening deformation, ensures the dimensional accuracy and quality stability of the final product, and shortens the production cycle and reduces production costs.

[0007] Technical Solution: To achieve the above objectives, this utility model provides a double-shot overmolding mold with an in-mold shaping mechanism, comprising a moving mold assembly and a fixed mold assembly. During mold closing, the moving mold assembly and the fixed mold assembly abut against each other, defining a first-shot mold cavity and a second-shot mold cavity. The moving mold assembly is provided with an in-mold opening shaping mechanism, and the fixed mold assembly is provided with an elastic holding mechanism for holding one end of the first-shot product during overmolding.

[0008] The in-mold opening shaping mechanism includes a shaping block movably disposed next to the two-shot mold cavity, and a drive assembly for driving the shaping block. During mold closing, the moving mold assembly drives the drive assembly to move, thereby driving the shaping block to extend into the two-shot mold cavity to shape the opening of one of the shot products.

[0009] This invention first involves closing the moving mold assembly and the fixed mold assembly, injecting molten material into the first injection cavity, and allowing it to cool and solidify to form the first-shot product. Then, the moving mold assembly and the fixed mold assembly separate, and the first-shot product is moved to the second injection cavity, where the molds are closed again. During the mold closing process, the elastic holding mechanism of the fixed mold assembly first contacts the first-shot product. The pre-tightening force of the elastic component ensures that the holding block tightly holds one end of the first-shot product, preventing displacement or shaking during shaping and subsequent overmolding. Simultaneously, the pad in the moving mold assembly moves towards the fixed mold assembly with the mold closing action. The pad, through a connecting rod, pushes the support block to slide along the sliding groove of the moving mold plate. The support block then drives the shaping block to move into the second injection cavity until the shaping block inserts into the opening of the first-shot product. The opening of the first-shot product, deformed due to cooling and shrinkage, is precisely shaped to the designed size, ensuring the product opening meets design requirements. Then, molten overmolding material is injected into the second-shot mold cavity. At this time, the shaping block still maintains the shaping state of the opening of the first-shot product. The first-shot product is affected by the residual heat of the molten material in the second-shot mold cavity, and its internal stress is released, so the opening size after shaping is maintained stably. After the second-shot overmolding material cools and solidifies, the moving mold assembly and the fixed mold assembly begin to separate. During this process, the backing plate moves backward with the moving mold assembly as a whole, and drives the support block and the shaping block to exit from the second-shot mold cavity through the connecting rod, releasing the shaping constraint on the product opening, and finally completing the entire double-shot overmolding and in-mold shaping process. By combining the above-mentioned in-mold synchronous shaping and overmolding process, the problems of low production efficiency and increased costs caused by traditional post-shaping processes are avoided, and the dimensional accuracy and production stability of the product are significantly improved.

[0010] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold shaping mechanism, the moving mold assembly includes a moving template, a backing plate, and an ejector mechanism. A pull block is connected to one side of the moving template, and a pull plate is connected to the backing plate. The pull block is movably connected to a groove provided in the pull plate. During mold closing, a gap is maintained between the pull block and the upper sidewall of the groove. The driving assembly includes a support block and a connecting rod. The support block is slidably disposed in a sliding groove provided in the moving template, and the shaping block is fixedly connected to the support block. Both ends of the connecting rod are fixedly connected to the backing plate and the support block, respectively. During mold closing, the backing plate pushes the support block towards the fixed mold assembly via the connecting rod, and the support block drives the shaping block to extend into the second-shot mold cavity. During mold parting, the backing plate and ejector mechanism first retract, thereby driving the connecting rod and support block to move away from the fixed mold assembly, causing the shaping block to be extracted from the second-shot mold cavity. Simultaneously, the pull block moves along the groove provided on the pull plate. When the pad plate retracts to the upper side wall of the groove on the pull plate and contacts the pull block, the pull plate drives the moving template to retract via the pull block, achieving overall mold separation of the moving mold assembly. The length design of the groove ensures that in the initial stage of mold separation, the shaping block separates from the fixed mold assembly before the moving template. During mold closing, the moving template contacts the fixed mold assembly first and completes initial positioning. Subsequently, the pad plate pushes the support block and the shaping block into the shaping position via the connecting rod, achieving precise shaping of the opening of the product in one shot. This step-by-step action design ensures the coordination of the movement of various mold components during mold closing and ensures the accuracy of the shaping operation.

[0011] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold shaping mechanism, the shaping block has opposing guide ramps and a shaping surface located behind the guide ramps. The guide ramps converge towards the first-shot product and are used to guide the shaping block into the opening of the first-shot product. The distance between the two shaping surfaces is equal to the design width of the product opening, and the shaping surface is used to shape the opening of the first-shot product. During the process of the shaping block entering the second-shot mold cavity, the guide ramp at its front end first contacts the edge of the opening of the first-shot product. Because the guide ramps converge towards the first-shot product, they can smoothly guide the shaping block into the opening of the first-shot product, avoiding damage to the product.

[0012] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold forming mechanism, the fixed mold assembly includes a fixed mold plate, a runner plate, and a heat insulation plate. The elastic holding mechanism includes an elastic component and a holding block. The elastic component and the holding block are connected, and the holding block is slidably connected within a groove provided in the fixed mold plate. Both ends of the elastic component abut against the runner plate and the holding block, respectively. During mold parting, the elastic component positions the bottom end of the holding block within the second-shot mold cavity. During mold closing, the first-shot product pushes the holding block, compressing the elastic component, and the holding block holds one end of the first-shot product. During mold closing, the top end of the first-shot product will first contact the bottom of the holding block. As mold closing continues, the first-shot product will push the holding block upwards, causing it to slide upwards within the groove of the fixed mold plate, compressing the elastic component. The compressed elastic component generates a counterforce, applied to the top end of the first-shot product, pressing it against the core surface of the moving mold, preventing product displacement and ensuring high-precision molding and forming.

[0013] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold shaping mechanism, the elastic components include a guide rod and a compression spring. One end of the guide rod is connected to a countersunk hole in the pressure block, and the compression spring is sleeved on the outside of the guide rod, with both ends of the compression spring abutting against the runner plate and the bottom of the countersunk hole, respectively. The heat insulation plate is provided with clearance holes, which are used to allow the guide rod to pass during mold closing. The guide rod plays a guiding and stabilizing role during the spring compression and rebound process, preventing the spring from bending, deflecting, or even jamming, and ensuring the smooth movement of the pressure block.

[0014] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold forming mechanism, wings are provided on both sides of the holding block, with the wings located at the end of the holding block near the runner plate. The fixed mold plate has a groove on the side near the runner plate that mates with the wings. During mold parting, the bottom surfaces of the wing and the groove on the runner plate abut against each other. During mold closing, a gap is maintained between the wing and the bottom surface of the groove on the runner plate.

[0015] In the parting state, the compression spring pushes the holding block downwards until the wings on both sides of the holding block abut against the bottom surface of the groove in the fixed mold plate, preventing the holding block from falling out of the groove in the fixed mold plate. In the mold closing state, the holding block is pushed upwards by the product. At this time, the wings will disengage from the bottom surface of the groove and maintain a certain gap, providing the necessary working stroke for effectively holding the product.

[0016] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold forming mechanism, the contact end between the holding block and the first-shot product is provided with a contoured surface, which is adapted to the outer surface of the first-shot product. The contoured surface has a relief groove, which is located along the centerline of the second-shot mold cavity, and the relief groove provides clearance for flash. The design of the contoured surface increases the contact area between the holding block and the product, improving the stability and uniformity of the holding process. The relief groove runs parallel to the centerline of the second-shot mold cavity, accommodating and avoiding some flash generated by the first-shot product, ensuring the stability of the holding process.

[0017] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold forming mechanism, the moving mold assembly is equipped with a positioning component. This positioning component is movably positioned beside the second-shot mold cavity. The positioning component includes a positioning core mechanism and a positioning drive mechanism slidably connected to the positioning core mechanism. The positioning core mechanism is slidably connected to the moving mold assembly, and the driving direction of the positioning drive mechanism is set along the sliding direction of the positioning core mechanism. After mold closing, the positioning drive mechanism drives the positioning core mechanism to extend into the handle hole (or handle hole) provided in the first-shot product. After mold closing, the positioning drive mechanism drives the core rod of the positioning core mechanism to extend into the handle hole provided in the first-shot product, achieving precise positioning of the handle portion of the first-shot product to be overmolded, effectively preventing product misalignment during the overmolding process, thereby ensuring the quality of the double-shot overmolding product.

[0018] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold forming mechanism, the moving mold assembly includes a slide plate assembly, the extension direction of which is parallel to the axis of the handle hole provided in the first-shot product. A positioning core mechanism is arranged along the extension direction of the slide plate assembly. The positioning core mechanism includes a slider and a mandrel connected to each other. The slider and the slide plate assembly are slidably connected, and a positioning drive mechanism drives the slider to slide along the slide plate assembly. The outer periphery of the mandrel is correspondingly positioned to the inner wall of the handle hole provided in the first-shot product.

[0019] Furthermore, in the aforementioned double-shot overmolding mold with an in-mold forming mechanism, the slide plate assembly is configured as parallel, spaced plates, and the slider has a sliding part adapted to the slide plate assembly, with the sliding part having an I-shaped cross-section. The positioning drive mechanism is configured as a hydraulic cylinder. The I-shaped cross-section of the sliding part allows it to form an embedded fit with the slide plate assembly, preventing the slider from lifting or shifting during movement, ensuring sliding accuracy, and ensuring that the positioning core mechanism reliably completes the core insertion and core removal actions.

[0020] As can be seen from the above technical solution, this utility model has the following beneficial effects: The double-injection overmolding mold with an in-mold shaping mechanism provided by this utility model integrates the shaping process into the injection molding cycle by integrating the in-mold opening shaping mechanism, eliminating the need for a separate subsequent shaping step, improving production efficiency, reducing labor and equipment costs, and solving the problem of defects caused by product deformation. Utilizing the mold closing action as a power source, no additional drive mechanism is required, resulting in a simple and reliable mechanism that ensures the consistency and high precision of the product opening size. Through an elastic holding mechanism that holds the product from the outside and a structural positioning component that positions it from the inside, a combined internal and external clamping and positioning system is formed, which can prevent product displacement during injection molding and shaping, ensuring the positional accuracy of overmolding and shaping. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the double-shot overmolding mold with an in-mold forming mechanism according to the present invention. Figure 2This is a front view of the double-shot overmolding mold with an in-mold forming mechanism according to the present invention. Figure 3 for Figure 1 The image shows a partially enlarged view of the in-mold opening and shaping mechanism. Figure 4 This is an internal schematic diagram of the double-shot overmolding mold with an in-mold shaping mechanism according to this utility model; Figure 5 This is a schematic diagram of the structure of the shaping block; Figure 6 for Figure 1 The image shows a partially enlarged view of the elastic pressing mechanism. Figure 7 This is a schematic diagram of the elastic pressing mechanism; Figure 8 for Figure 1 A partial enlarged view of the positioning component is provided; Figure 9 This is a schematic diagram of the positioning component; Figure 10 A schematic diagram of the structure of a single-shot product; Figure 11 This is a schematic diagram of the structure of a two-shot product.

[0022] In the diagram: 1. Moving mold assembly, 11. Moving template, 111. Pull block, 121. Pull plate, 1211. Pull groove, 12. Pad plate, 13. Ejector mechanism, 2. Fixed mold assembly, 21. Fixed template, 22. Runner plate, 23. Heat insulation plate, 231. Clearance hole, 31. Shaping block, 311. Guide slope, 312. Shaping surface, 32. Support block, 33. Connecting rod, 41. Holding block, 411. Wing, 412. Contouring surface, 413. Clearance groove, 42. Guide rod, 43. Compression spring, 51. Positioning core mechanism, 511. Slider, 512. Mandrel, 513. Sliding part, 52. Positioning drive mechanism, 53. Slide plate assembly, 100. First injection cavity, 200. Second injection cavity. Detailed Implementation Example

[0023] like Figure 1 The illustrated double-shot overmolding mold with an in-mold shaping mechanism includes a moving mold assembly 1 and a fixed mold assembly 2. During mold closing, the moving mold assembly 1 and the fixed mold assembly 2 abut against each other, defining a first-shot mold cavity 100 and a second-shot mold cavity 200. The moving mold assembly 1 is provided with an in-mold opening shaping mechanism, and the fixed mold assembly 2 is provided with a mechanism for shaping the first-shot product (e.g., ...). Figure 10 An elastic holding mechanism that holds one end of the rubber during the overmolding process.

[0024] The in-mold opening shaping mechanism includes a shaping block 31 movably disposed beside the two-shot mold cavity 200, and a drive assembly for driving the shaping block 31. During mold closing, the moving mold assembly 1 drives the drive assembly to move, thereby driving the shaping block 31 to extend into the two-shot mold cavity 200 to shape the opening of one of the shot products.

[0025] like Figure 1-4 The double-shot overmolding mold with an in-mold shaping mechanism shown includes a moving mold assembly 1 comprising a moving mold plate 11, a backing plate 12, and an ejector pin mechanism 13. A pull block 111 is connected to one side of the moving mold plate 11, and a pull plate 121 is connected to the backing plate 12. The pull block 111 is movably connected to a groove 1211 provided in the pull plate 121. During mold closing, a gap is maintained between the pull block 111 and the upper sidewall of the groove 1211. The driving assembly includes a support block 32 and a connecting rod 33. The support block 32 is slidably disposed in a sliding groove provided in the moving mold plate 11, and a shaping block 31 is fixedly connected to the support block 32. Both ends of the connecting rod 33 are fixedly connected to the backing plate 12 and the support block 32, respectively. During mold closing, the backing plate 12 pushes the support block 32 towards the fixed mold assembly 2 via the connecting rod 33, and the support block 32 drives the shaping block 31 to extend into the double-shot cavity 200.

[0026] like Figure 5 The double-shot overmolding mold with an in-mold shaping mechanism shown has a shaping block 31 with a guide ramp 311 and a shaping surface 312 located behind the guide ramp 311. The guide ramp 311 is convergent towards the first-shot product direction to guide the shaping block 31 into the opening of the first-shot product. The distance between the two shaping surfaces 312 is equal to the design width of the product opening, and the shaping surface 312 is used to shape the opening of the first-shot product. During the process of the shaping block 31 entering the second-shot mold cavity 200, the guide ramp 311 at its front end first contacts the edge of the opening of the first-shot product. Because the guide ramp 311 is convergent towards the first-shot product direction, it can smoothly guide the shaping block 31 into the opening of the first-shot product, avoiding damage to the product.

[0027] like Figure 1 , 6 The double-shot overmolding mold with an in-mold shaping mechanism shown includes a fixed mold assembly 2 comprising a fixed mold plate 21, a runner plate 22, and a heat insulation plate 23. The elastic holding mechanism includes an elastic component and a holding block 41. The elastic component and the holding block 41 are connected, and the holding block 41 is slidably connected within a groove provided in the fixed mold plate 21. Both ends of the elastic component abut against the runner plate 22 and the holding block 41, respectively. During mold parting, the elastic component ensures that the bottom end of the holding block 41 is within the double-shot cavity 200.

[0028] In this embodiment, the elastic component includes a guide rod 42 and a compression spring 43. One end of the guide rod 42 is connected to a countersunk hole in the pressure block 41, and the compression spring 43 is sleeved on the outside of the guide rod 42, with both ends of the compression spring 43 abutting against the flow channel plate 22 and the bottom of the countersunk hole, respectively. The heat insulation plate 23 is provided with a clearance hole 231, which is used to avoid the guide rod 42 during the mold closing process.

[0029] like Figure 7 The double-shot overmolding mold with an in-mold shaping mechanism shown has wings 411 on both sides of the holding block 41, with the wings 411 located at the end of the holding block 41 near the runner plate 22. The fixed mold plate 21 has a groove on the side near the runner plate 22 that mates with the wings 411. During mold parting, the bottom surfaces of the wing 411 and the grooves on the runner plate 22 abut against each other. During mold closing, a gap is maintained between the wing 411 and the bottom surfaces of the grooves on the runner plate 22.

[0030] In this embodiment, the pressing block 41 and the contact end of the first shot product are provided with a contoured surface 412, which is adapted to the outer surface of the first shot product. The contoured surface 412 is provided with a relief groove 413, which is provided along the center line of the second shot mold cavity 200, and the relief groove 413 provides relief for the flash.

[0031] like Figure 8-9 The double-shot overmolding mold with an in-mold forming mechanism shown has a positioning component in the moving mold assembly 1. This positioning component is movably positioned beside the second-shot mold cavity 200. The positioning component includes a positioning core mechanism 51 and a positioning drive mechanism 52 slidably connected to the positioning core mechanism 51. The positioning core mechanism 51 is slidably connected to the moving mold assembly 1, and the driving direction of the positioning drive mechanism 52 is set along the sliding direction of the positioning core mechanism 51. After mold closing, the positioning drive mechanism 52 drives the positioning core mechanism 51 to extend into the handle hole provided in the first-shot product. After mold closing, the positioning drive mechanism 52 drives the mandrel 512 of the positioning core mechanism 51 to extend into the handle hole provided in the first-shot product, achieving precise positioning of the handle part to be overmolded in the first-shot product. This effectively prevents product misalignment during the overmolding process, thereby ensuring the quality of the double-shot overmolding product.

[0032] In this embodiment, the moving mold assembly 1 is provided with a sliding plate assembly 53, the extension direction of which is parallel to the axis of the handle hole provided in the first injection product. A positioning core mechanism 51 is arranged along the extension direction of the sliding plate assembly 53. The positioning core mechanism 51 includes a slider 511 and a mandrel 512 connected to each other. The slider 511 and the sliding plate assembly 53 are slidably connected, and the positioning drive mechanism 52 drives the slider 511 to slide along the sliding plate assembly 53. The outer periphery of the mandrel 512 is correspondingly arranged with respect to the inner wall of the handle hole provided in the first injection product.

[0033] In this embodiment, the slide plate assembly 53 is configured as parallel spaced plates, and the slider 511 is provided with a sliding part 513 adapted to the slide plate assembly 53, the sliding part 513 having an I-shaped cross-section. The positioning drive mechanism 52 is configured as a hydraulic cylinder.

[0034] The ejection mechanism, gate, runner, slider, etc. in this utility model are conventional settings and will not be described in detail here. For their specific structure and working principle, please refer to the existing technology.

[0035] The working process of this utility model is as follows: The injection molding machine starts to close the mold, and the moving mold assembly 1 moves as a whole towards the fixed mold assembly 2 until they come into contact and the mold is closed. Molten material is injected into the injection cavity 100 through the first gate, and after cooling and solidification, an injection product is formed (e.g., Figure 10 (As shown). Subsequently, the injection molding machine controls the moving mold assembly 1 to separate from the fixed mold assembly 2, entering the mold parting state. In the initial stage of mold parting, the backing plate 12 and the ejector pin mechanism 13 first retract, driving the support block 32 and the shaping block 31 to move away from the fixed mold assembly 2 via the connecting rod 33, so that the shaping block 31 exits from the two-shot cavity 200. At the same time, the pull block 111 on the moving mold plate 11 moves relative to the pull groove 1211 of the pull plate 121. At this time, the pull block 111 has not yet contacted the upper side wall of the pull groove 1211, and the moving mold plate 11 temporarily maintains its relative position with the fixed mold assembly 2. When the backing plate 12 retracts to a certain distance, after the upper side wall of the pull groove 1211 of the pull plate 121 contacts the pull block 111, the pull plate 121 drives the moving mold plate 11 to begin to retract, realizing the overall mold parting of the moving mold assembly 1. After the mold is separated, the first product in the first injection mold cavity 100 is taken out by a robot or transfer mechanism and placed in the corresponding moving mold core position in the second injection mold cavity 200.

[0036] Next, the injection molding machine drives the moving mold assembly 1 to move towards the fixed mold assembly 2 for a second mold closing. During the mold closing process, the holding block 41 in the elastic holding mechanism of the fixed mold assembly 2 first contacts the top of the first injection product. The top of the first injection product pushes the holding block 41, causing it to slide upward within the groove of the fixed mold plate 21. The holding block 41 drives the guide rod 42 to move upward, and the compression spring 43 sleeved on the outside of the guide rod 42 is compressed, generating an elastic force. This elastic force is applied to the top of the first injection product through the contoured surface 412 of the holding block 41, tightly pressing the first injection product against the core surface of the moving mold, thus fixing one end of the first injection product.

[0037] After the holding block 41 completes holding the first shot of the product, the mold closing action continues, and the backing plate 12 begins to move forward relative to the moving mold plate 11. The backing plate 12 pushes the support block 32 to slide along the sliding groove of the moving mold plate 11 towards the fixed mold assembly 2 via the connecting rod 33. The support block 32 drives the shaping block 31 to move into the second shot mold cavity 200. The guide slope 311 at the front end of the shaping block 31 first contacts the edge of the opening of the first shot. The converging design of the guide slope 311 guides the shaping block 31 to smoothly insert into the opening of the first shot until the shaping surface 312 of the shaping block 31 is completely in contact with the inner wall of the opening of the first shot. Since the distance between the two shaping surfaces 312 is equal to the design width of the product opening, the opening of the first shot that is deformed due to cooling and shrinkage is precisely shaped into the design size.

[0038] After the mold is closed, the positioning drive mechanism 52 is activated, driving the slider 511 of the positioning core mechanism 51 to slide along the extension direction of the slide plate assembly 53. The I-shaped sliding part 513 at the bottom of the slider 511 forms a stable embedded sliding fit with the plate of the slide plate assembly 53. The slider 511 drives the mandrel 512 to move synchronously. The mandrel 512 extends into the handle hole provided in the first-shot product. The outer periphery of the mandrel 512 fits tightly against the inner wall of the handle hole, achieving precise positioning of the handle part of the first-shot product to be coated. At this time, the first-shot product forms a stable clamping and positioning system through the external pressing of the elastic pressing mechanism and the internal positioning of the positioning core mechanism 51, effectively preventing displacement or shaking during the subsequent coating process.

[0039] Subsequently, the injection molding machine injects molten overmolded material (such as...) into the second injection cavity 200 through the second gate. Figure 11 The image shows a two-shot product. During the overmolding process, the shaping block 31 maintains the shaping state of the opening of the first-shot product. Under the residual heat of the molten material in the second-shot mold cavity 200, the internal stress of the first-shot product is released to a certain extent, so that the opening size after shaping can be maintained stably.

[0040] After the second-shot overmolding material cools and solidifies, the injection molding machine controls the moving mold assembly 1 and the fixed mold assembly 2 to separate the mold again. Initially, the backing plate 12 and ejector mechanism 13 retract, driving the support block 32 and shaping block 31 out of the second-shot mold cavity 200 via the connecting rod 33, releasing the shaping constraint on the product opening. The positioning drive mechanism 52 drives the slider 511 to pull the mandrel 512 out of the hole of the first-shot product, releasing the positioning. As the backing plate 12 continues to retract, the upper side wall of the pull groove 1211 of the pull plate 121 contacts the pull block 111, driving the moving mold plate 11 to retract, achieving overall mold separation of the moving mold assembly 1. After mold separation, the ejector mechanism 13 actuates, ejecting the molded double-shot overmolding product from the moving mold core, where it is removed by a robotic arm, completing the entire production cycle.

[0041] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A double-shot overmolding mold with an in-mold shaping mechanism, characterized in that: It includes a moving mold assembly (1) and a fixed mold assembly (2); when the mold is closed, the moving mold assembly (1) and the fixed mold assembly (2) abut against each other and define a first injection cavity (100) and a second injection cavity (200); the moving mold assembly (1) is provided with an in-mold opening shaping mechanism, and the fixed mold assembly (2) is provided with an elastic pressing mechanism for pressing one end of the product when it is being overmolded; The in-mold opening shaping mechanism includes a shaping block (31) movably disposed next to the two-shot mold cavity (200), and a driving component for driving the shaping block (31); when the mold is closed, the moving mold component (1) drives the driving component to move, so as to drive the shaping block (31) to extend into the two-shot mold cavity (200) to shape the opening of one of the shot products.

2. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 1, characterized in that: The moving mold assembly (1) includes a moving mold plate (11), a pad plate (12), and an ejector pin mechanism (13); a pull block (111) is connected to one side of the moving mold plate (11), and a pull plate (121) is connected to the pad plate (12). The pull block (111) is movably connected to a groove (1211) provided in the pull plate (121); when the mold is closed, the pull block (111) and the upper sidewall of the groove (1211) maintain a gap; the driving assembly includes a support block (32) and a connecting rod (3). 3); The support block (32) is slidably disposed in the sliding groove provided in the moving template (11), and the shaping block (31) is fixedly connected to the support block (32); the two ends of the connecting rod (33) are fixedly connected to the pad (12) and the support block (32) respectively; when the mold is closed, the pad (12) pushes the support block (32) to move towards the fixed mold assembly (2) through the connecting rod (33), and the support block (32) drives the shaping block (31) to extend into the two-shot mold cavity (200).

3. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 1, characterized in that: The shaping block (31) is provided with a guide slope (311) and a shaping surface (312) located behind the guide slope (311); the guide slope (311) is converged towards the direction of the product injection and is used to guide the shaping block (31) into the opening of the product injection; the distance between the two shaping surfaces (312) is equal to the design width of the product opening, and the shaping surface (312) is used to shape the opening of the product injection.

4. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 1, characterized in that: The fixed mold assembly (2) includes a fixed mold plate (21), a runner plate (22), and a heat insulation plate (23); the elastic pressing mechanism includes an elastic component and a pressing block (41); the elastic component and the pressing block (41) are connected, and the pressing block (41) is slidably connected in a groove provided in the fixed mold plate (21); the two ends of the elastic component abut against the runner plate (22) and the pressing block (41) respectively; when the mold is separated, the elastic component makes the bottom end of the pressing block (41) place in the second injection cavity (200); when the mold is closed, the first injection product pushes the pressing block (41) to compress the elastic component, and the pressing block (41) presses one end of the first injection product.

5. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 4, characterized in that: The elastic component includes a guide rod (42) and a compression spring (43); one end of the guide rod (42) is connected to a countersunk hole provided in the pressure block (41), and the compression spring (43) is sleeved on the outside of the guide rod (42). The two ends of the compression spring (43) abut against the flow channel plate (22) and the bottom of the countersunk hole, respectively; the heat insulation plate (23) is provided with a clearance hole (231), which is used to avoid the guide rod (42) during the mold closing process.

6. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 4, characterized in that: The pressing block (41) is provided with wings (411) on both sides, and the wings (411) are located at the end of the pressing block (41) near the flow channel plate (22); the fixed template (21) is provided with a groove that cooperates with the wings (411) on the side near the flow channel plate (22); when the mold is separated, the bottom surface of the groove provided by the wings (411) and the flow channel plate (22) abuts; when the mold is closed, the bottom surface of the groove provided by the wings (411) and the flow channel plate (22) maintains a gap.

7. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 4, characterized in that: The pressing block (41) and the contact end of the first shot product are provided with a contoured surface (412), which is adapted to the outer surface of the first shot product; the contoured surface (412) is provided with a relief groove (413), which is arranged along the center line of the second shot mold cavity (200), and the relief groove (413) provides relief to the flash.

8. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 1, characterized in that: The moving mold assembly (1) is provided with a positioning component, which is movably disposed next to the two-shot mold cavity (200). The positioning component includes a positioning core mechanism (51) and a positioning drive mechanism (52) that is drivenly connected to the positioning core mechanism (51). The positioning core mechanism (51) is slidably connected to the moving mold assembly (1), and the driving direction of the positioning drive mechanism (52) is set along the sliding direction of the positioning core mechanism (51). After the mold is closed, the positioning drive mechanism (52) drives the positioning core mechanism (51) to extend into the hole provided in the first shot product.

9. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 8, characterized in that: The moving mold assembly (1) is provided with a sliding plate assembly (53), the extension direction of which is parallel to the axis of the handle hole provided in the first shot product; the positioning core mechanism (51) is provided along the extension direction of the sliding plate assembly (53); the positioning core mechanism (51) includes a slider (511) and a mandrel (512) connected to each other; the slider (511) and the sliding plate assembly (53) are slidably connected, and the positioning drive mechanism (52) drives the slider (511) to slide along the sliding plate assembly (53); the outer periphery of the mandrel (512) is correspondingly provided with the inner wall of the handle hole provided in the first shot product.

10. The double-shot overmolding mold with an in-mold shaping mechanism according to claim 9, characterized in that: The skateboard assembly (53) is a plate with parallel spacing. The slider (511) is provided with a sliding part (513) that is adapted to the skateboard assembly (53). The cross-section of the sliding part (513) is I-shaped. The positioning drive mechanism (52) is a hydraulic cylinder.

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