Headlamp back plate support mold with tunnel core-pulling mechanism

Abstract

The headlamp backboard support mold with the tunnel core-pulling mechanism comprises an upper mold body and a lower mold body, and a first forming face is arranged at the lower end of the upper mold body; a second forming surface is arranged at the upper end of the lower die and is matched with the first forming surface; an injection molding hole is formed in the upper mold in a penetrating manner and is communicated with the first molding surface; the front side core-pulling module is arranged on the lower die and is positioned on the front side of the second forming surface; the tunnel core-pulling mechanisms are symmetrically arranged in the two sides of the lower die; the core-pulling end of the tunnel core-pulling mechanism is matched with the surface of the second forming surface; the rear side linkage core-pulling module is arranged between the rear ends of the lower mold and the upper mold and is positioned on the rear side of the second forming surface; and the ejection mechanism is arranged in the lower die. Through cooperation of multidirectional core pulling, a product can be smoothly and completely taken out, and the problem of back-off is avoided.

Description

Technical Field

[0001] The invention relates to a headlamp back panel bracket mould with a tunnel core pulling mechanism, belonging to the technical field of moulds. Background Art

[0002] In the motorcycle manufacturing industry, as consumers increasingly demand refined design, integrated functionality, and riding comfort, backplane structures integrating headlights and instrument panels are becoming a key industry development direction due to their unique advantages. This integrated structure effectively optimizes the front space layout of the motorcycle, reduces component assembly gaps, and creates a smoother, more coordinated appearance. It also meets consumers' diverse demands for personalized styling, earning it widespread market favor.

[0003] However, since the integrated back panel of the headlight and instrument bracket needs to integrate multiple functions, its structure is often complex, often containing irregular curved surfaces, concave and convex patterns, and special cavities designed to achieve functions. This poses challenges to mold design and manufacturing, especially in the demolding process after injection molding, where some structures on the back panel are prone to undercuts. If a targeted solution is not set up in the mold, the plastic part will be stuck in the mold during demolding, which will not only prevent the product from being removed smoothly, but may also cause deformation and damage to the plastic part, and even affect the service life of the mold. Therefore, in order to ensure the smooth production of such complex structure back panels, designing and setting up an adaptive core-pulling mechanism in the mold to solve the undercut problem has become a research topic in the industry. Summary of the Invention

[0004] The purpose of the present invention is to provide a headlamp back panel bracket mold with a tunnel core pulling mechanism. The present invention uses the coordinated cooperation of multi-directional core pulling to enable the product to be removed smoothly and completely, avoiding the problem of undercutting.

[0005] The technical solution of the present invention is as follows: a headlamp back panel bracket mold with a tunnel core pulling mechanism includes an upper mold and a lower mold, wherein the lower end of the upper mold is provided with a first molding surface; the upper end of the lower mold is provided with a second molding surface, the second molding surface cooperating with the first molding surface; the upper mold is provided with an injection hole extending through the upper mold, the injection hole being connected to the first molding surface; the mold further includes: A front core pulling module is provided on the lower mold and is located in front of the second molding surface; the front core pulling module is used to support the front end of the second molding surface before the product is molded and to perform forward core pulling after the product is molded; The tunnel core-pulling mechanism is symmetrically arranged inside both sides of the lower mold; the core-pulling end of the tunnel core-pulling mechanism is in line with the surface of the second forming surface; the tunnel core-pulling mechanism is used to form the side forming structure of the product and perform side core pulling; The rear side linkage core pulling module is arranged between the rear ends of the lower mold and the upper mold; the rear side linkage core pulling module is driven by the upper mold to realize support when the mold is closed and automatic core pulling when the mold is opened; The ejection mechanism is arranged in the lower mold; the ejection mechanism is used to eject the product from the second molding surface during the demoulding stage.

[0006] The above-mentioned headlamp back panel bracket mold with a tunnel core-pulling mechanism, the front core-pulling module includes a first movable groove arranged at the front end of the lower mold, the first movable groove is inclined and arranged from low to high from outside to inside; the front end of the first movable groove is provided with a mounting plate, and the front end of the mounting plate is provided with a first cylinder; first limit blocks are fixedly connected on both sides of the first movable groove, and a first slide groove is formed between the first limit block and the bottom surface of the first movable groove, and a first interference block is slidably connected in the first slide groove; a first guide block is symmetrically provided at the bottom of the first movable groove; a second slide groove is symmetrically provided at the bottom of the first interference block, and the second slide groove cooperates with the first guide block.

[0007] The aforementioned headlamp back panel bracket mold with a tunnel core pulling mechanism, the outer side surface of the first interference block is provided with a first inclined surface, and the first inclined surface is from low to high from the outside to the inside; the lower end front side of the upper mold is provided with a second limit block, and the inner side surface of the second limit block is provided with a second inclined surface, and the second inclined surface is matched with the first inclined surface.

[0008] The aforementioned headlamp back panel bracket mold with a tunnel core-pulling mechanism, the tunnel core-pulling mechanism includes a transverse groove arranged in the lower mold, the outer end of the transverse groove is fixedly connected to the second cylinder, the output end of the second cylinder is inwardly connected to the first moving block, the upper end of the first moving block is provided with a third inclined surface, and the third inclined surface is from high to low from outside to inside; the first moving block is provided with a third slide groove, and the third slide groove is parallel to the third inclined surface; the lower mold is provided with a vertical groove, and the vertical groove is connected to the transverse groove; the vertical groove is slidably connected with a second interference block, and the lower end of the second interference block is provided with a second guide block, and the second guide block cooperates with the third slide groove.

[0009] The aforementioned headlamp back panel bracket mold with a tunnel core-pulling mechanism has a limiting bolt fixedly connected in the vertical groove; a countersunk hole is provided on the second abutment block; and the limiting bolt is slidably engaged with the countersunk hole.

[0010] The aforementioned headlamp back panel bracket mold with a tunnel core-pulling mechanism, the rear-side linkage core-pulling module includes a second movable groove arranged at the rear end of the lower mold and an inclined guide rod arranged below the rear end of the upper mold; the second movable groove is arranged at an angle and from low to high from the outside to the inside; the inclined guide rod is parallel to the second movable groove; third limit blocks are fixedly connected on both sides of the second movable groove, and a fourth slide groove is formed between the third limit block and the bottom surface of the second movable groove, and a third interference block is slidably connected in the fourth slide groove; the third interference block is provided with an inclined guide hole, which cooperates with the inclined guide rod.

[0011] The aforementioned headlamp back panel bracket mold with a tunnel core-pulling mechanism, the outer side surface of the third interference block is provided with a fourth inclined surface, and the fourth inclined surface is from low to high from the outside to the inside; the rear side of the lower end of the upper mold is provided with a fourth limit block, and the inner side surface of the fourth limit block is provided with a fifth inclined surface, and the fifth inclined surface fits with the fourth inclined surface; the fourth limit block is provided with a mounting hole, and the oblique guide rod is arranged in the mounting hole.

[0012] The aforementioned headlamp back panel bracket mold with a tunnel core-pulling mechanism, the ejection mechanism includes a movable cavity arranged at the lower end of the lower mold, a bottom plate and a plurality of vertical guide rods are provided in the movable cavity, the bottom plate and the vertical guide rods are slidably connected; a plurality of ejection rods are provided on the bottom plate; a plurality of ejection grooves are provided through the lower mold, and the ejection grooves cooperate with the ejection rods.

[0013] The aforementioned headlamp back panel bracket mold with a tunnel core pulling mechanism has a placement groove on the second molding surface, which is connected to the ejection groove; an ejection block is provided in the placement groove, and the lower end of the ejection block is fixedly connected to multiple ejection rods.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, the molds are first closed, and the upper mold and the lower mold are precisely docked so that the first molding surface of the upper mold and the second molding surface of the lower mold fit closely together to form a complete cavity for molding the product; then, molten glue is injected into the cavity through the injection hole set through the upper mold, and the molten glue fills the cavity and gradually cools and forms. After the product is cooled and formed, it enters the demolding stage: the upper mold first moves upward, and during this process, it drives the rear-side linkage core pulling module to move, so that it is separated from the rear end of the product, completing the first core pulling; then, the front-side core pulling module is started and separated from the front end of the product, achieving the second core pulling; after that, the tunnel core pulling mechanism symmetrically arranged on both sides of the lower mold is operated, and its core pulling end is separated from the product, completing the third core pulling. After the above-mentioned multiple core pullings, the contact area and bite force between the product and the second molding surface can be effectively reduced, avoiding the problem of product jamming caused by the undercut structure, and creating favorable conditions for subsequent demolding. Finally, the ejection mechanism on the lower mold starts to work, pushing the product upward, so that it is completely separated from the second molding surface. At this time, the product can be easily removed manually. During the entire process, the front core pulling module, tunnel core pulling mechanism, rear linkage core pulling module and ejection mechanism work together to ensure that the product can be demoulded smoothly and completely even with a complex structure, thus guaranteeing product quality and production efficiency.

[0015] 2. Before closing the mold, the front core-pulling module of the present invention extends the first cylinder to drive the first interference block to move along the setting direction of the first movable groove at the front end of the lower mold until the first interference block contacts the front end of the second molding surface, providing complete molding surface support for the molding of the front end of the product. During the movement, the second slide groove symmetrically set at the bottom of the first interference block slides with the first guide block symmetrically set at the bottom of the first movable groove, and the limiting effect of the guide structure ensures that its movement trajectory is stable and smooth; at the same time, the first limit blocks fixedly connected on both sides of the first movable groove form a first slide groove with the bottom surface of the first movable groove, and the first interference block slides in the first slide groove, effectively limiting the up and down displacement of the first interference block, preventing it from separating or offsetting from the first movable groove during the movement, and further ensuring the stability of the movement process. When the mold is closed, the upper mold moves downward, and the second limit block provided on the front side of its lower end moves downward synchronously, so that the second inclined surface of the inner side of the second limit block fits with the first inclined surface of the outer side of the first interference block, forming a rigid lock for the first interference block, which can effectively prevent the first interference block from loosening or displacement due to the pressure generated during the molten glue filling during the injection molding process, ensure the dimensional accuracy and integrity of the front end molding structure of the product, and avoid product defects caused by the displacement of the first interference block.

[0016] 3. When the tunnel core-pulling mechanism of the present invention performs the core-pulling operation, the second cylinder is started, and the output end of the second cylinder drives the first movable block in the transverse groove to move outward. Since the vertical groove on the lower mold is connected to the transverse groove, and the second interference block is slidably connected in the vertical groove, the vertical groove forms a vertical limit for the second interference block, so that it can only move vertically along the vertical groove. When the first movable block moves outward, the second guide block slides from the high point to the low point of the third chute under the guidance of the third chute, driving the second interference block to descend vertically along the vertical groove, and finally separating it from the surface of the second forming surface, completing the core-pulling action. During this process, the limit bolt fixedly connected in the vertical groove slides with the countersunk hole on the second interference block, limiting the moving trajectory of the second interference block, ensuring that it descends smoothly during core pulling, avoiding poor core pulling or damage to the product due to offset, and ensuring the accuracy and reliability of the core-pulling process.

[0017] 4. In the rear-side linkage core-pulling module of the present invention, when the upper mold descends during the mold closing stage, the inclined guide rod descends synchronously with the upper mold. Due to the cooperation between the inclined guide rod and the inclined guide hole, its descending action will be converted into a driving force for the third interference block, prompting the third interference block to gradually move inward along the inclined direction of the second movable groove. During this process, the third limit blocks fixedly connected on both sides of the second movable groove form a fourth chute with the bottom surface of the groove. The third interference block slides in the fourth chute to ensure that the moving trajectory is stable until the third interference block is in close contact with the rear end of the second molding surface, providing complete support for the rear-end molding of the product. At the same time, the fourth limit block on the rear side of the lower end of the upper mold descends together with the upper mold, and the fifth inclined surface provided on its inner side is fitted with the fourth inclined surface provided on the outer side of the third interference block. Through the close fit of the two inclined surfaces, the outward movement tendency of the third interference block due to the melt pressure during the injection molding process can be effectively limited, and its position can be further locked to ensure the dimensional accuracy and structural stability of the rear-end molding of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural diagram of the upper die; Figure 3 This is a schematic diagram of the structure of the product completed by injection molding on the lower mold; Figure 4 It is a structural diagram of the lower die; Figure 5 yes Figure 4 A magnified view of point A; Figure 6 It is a structural diagram of the front core pulling module; Figure 7 This is a structural diagram of the rear-side linkage core pulling module; Figure 8 It is a schematic diagram of the structure of the internal parts of the lower mold; Figure 9 This is a schematic diagram of the structure of the other side of the internal parts of the lower mold; Figure 10 It is a structural diagram of the tunnel core pulling mechanism.

[0019] The marks in the accompanying drawings are: 1-upper mold, 2-lower mold, 3-front core pulling module, 4-tunnel core pulling mechanism, 5-rear linkage core pulling module, 6-ejection mechanism, 7-product, 11-first molding surface, 12-injection hole, 20-second molding surface, 60-movable cavity, 61-bottom plate, 62-vertical guide rod, 63-ejector rod, 64-ejector groove, 65-placement groove, 66-ejector block, 300-first moving groove, 301-mounting plate, 302-first cylinder, 303-first limit block, 304-first slide groove, 305-first resistance block, 306-first guide block, 307-second slide groove , 308-first inclined plane, 309-second limiting block, 310-second inclined plane, 400-horizontal groove, 401-second cylinder, 402-first moving block, 403-third inclined plane, 404-third slide groove, 405-vertical groove, 406-second interference block, 407-second guide block, 408-limiting bolt, 409-countersunk hole, 500-second moving groove, 501-oblique guide rod, 502-third limiting block, 503-fourth slide groove, 504-third interference block, 505-oblique guide hole, 506-fourth inclined plane, 507-fourth limiting block, 508-fifth inclined plane, 509-mounting hole. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0021] Embodiment: A headlamp back panel bracket mold with a tunnel core pulling mechanism 4 is constructed as follows Figure 1-10 As shown, it includes an upper mold 1 and a lower mold 2. Both the upper mold 1 and the lower mold 2 are made of high-strength alloy tool steel Cr12MoV. This material has excellent wear resistance, hardenability and dimensional stability. It can withstand the high-frequency opening and closing impact and the long-term action of high-temperature molten glue during the injection process, ensuring the service life of the mold; Figure 2 As shown, the lower end of the upper mold 1 is provided with a first molding surface 11; the upper end of the lower mold 2 is provided with a second molding surface 20, and the second molding surface 20 cooperates with the first molding surface 11; the upper mold 1 is provided with an injection hole 12, and the injection hole 12 is connected to the first molding surface 11; the mold also includes: The front core pulling module 3 is provided on the lower mold 2 and is located in front of the second molding surface 20; the front core pulling module 3 is used to support the front end of the second molding surface 20 before the product 7 is molded, and to perform forward core pulling after the product 7 is molded; The tunnel core-pulling mechanism 4 is symmetrically arranged inside both sides of the lower mold 2; the core-pulling end of the tunnel core-pulling mechanism 4 is in line with the surface of the second molding surface 20; the tunnel core-pulling mechanism 4 is used to form the side molding structure of the product and perform lateral core pulling; The rear-side linkage core-pulling module 5 is arranged between the rear ends of the lower mold 2 and the upper mold 1 and is located on the rear side of the second molding surface 20; the rear-side linkage core-pulling module 5 is driven by the upper mold 1 to realize support when the mold is closed and automatic core pulling when the mold is opened; The ejection mechanism 6 is provided in the lower mold 2 ; the ejection mechanism 6 is used to eject the product from the second molding surface 20 during the demoulding stage.

[0022] During use, the molds are first closed, and the upper mold 1 and the lower mold 2 are precisely docked, so that the first molding surface 11 of the upper mold 1 and the second molding surface 20 of the lower mold 2 fit tightly together to form a complete cavity for molding the product 7; then, molten glue is injected into the cavity through the injection hole 12 set through the upper mold 1, and the molten glue fills the cavity and gradually cools and forms. After the product 7 is cooled and formed, it enters the demolding stage: the upper mold 1 first moves upward, and during this process, it drives the rear-side linkage core pulling module 5 to move, so that it separates from the rear end of the product 7, completing the first core pulling; then, the front-side core pulling module 3 starts and separates from the front end of the product 7, realizing the second core pulling; after that, the tunnel core pulling mechanism 4 symmetrically arranged on both sides of the lower mold 2 operates, and its core pulling end separates from the product 7, completing the third core pulling. After the above-mentioned multiple core pulling, the contact area and bite force between the product 7 and the second molding surface 20 can be effectively reduced, and the problem of product 7 being stuck due to the undercut structure can be avoided, creating favorable conditions for subsequent demolding. Finally, the ejection mechanism 6 on the lower mold 2 begins to work, lifting the product 7 upward and completely separating it from the second molding surface 20. At this point, the product 7 can be easily removed manually. Throughout this process, the front core pulling module 3, the tunnel core pulling mechanism 4, the rear linkage core pulling module 5, and the ejection mechanism 6 work together to ensure that the product 7 can be smoothly and completely demolded despite its complex structure, thereby ensuring the quality of the product 7 and production efficiency.

[0023] Preferably, if Figures 3 to 6As shown, the front core pulling module 3 includes a first movable groove 300 arranged at the front end of the lower mold 2, and the first movable groove 300 is inclined and arranged from outside to inside and from low to high; the front end of the first movable groove 300 is provided with a mounting plate 301, and the front end of the mounting plate 301 is provided with a first cylinder 302; first limit blocks 303 are fixedly connected to both sides of the first movable groove 300, and a first slide groove 304 is formed between the first limit block 303 and the bottom surface of the first movable groove 300, and a first interference block 305 is slidably connected in the first slide groove 304; the first limit block 303 prevents the first interference block 305 from deviating from the track during movement by limiting the up and down displacement of the first interference block 305; the bottom of the first movable groove 300 is symmetrically provided with a first guide block 306; the bottom of the first interference block 305 is symmetrically provided with a second slide groove 307, and the second slide groove 307 cooperates with the first guide block 306 to ensure that the first interference block 305 moves smoothly along the preset trajectory and reduces friction resistance. The outer side surface of the first contact block 305 is provided with a first inclined surface 308, and the first inclined surface 308 is from low to high from the outside to the inside; Figure 2 As shown, a second stopper 309 is provided at the front side of the lower end of the upper mold 1. The inner side of the second stopper 309 is provided with a second inclined surface 310, which mates with the first inclined surface 308. Before the mold is closed, the front core pulling module 3 extends the first cylinder 302 to drive the first abutment block 305 to move along the setting direction of the first movable groove 300 at the front end of the lower mold 2 until the first abutment block 305 abuts against the front end of the second molding surface 20, providing complete molding surface support for the molding of the front end of the product 7. During the movement, the second sliding groove 307 symmetrically arranged at the bottom of the first contact block 305 slides with the first guide block 306 symmetrically arranged at the bottom of the first moving groove 300, and the limiting effect of the guide structure ensures that its moving trajectory is stable and smooth; at the same time, the first sliding groove 304 is formed between the first limiting blocks 303 fixedly connected on both sides of the first moving groove 300 and the bottom surface of the first moving groove 300, and the first contact block 305 slides in the first sliding groove 304, which effectively limits the up and down displacement of the first contact block 305, preventing it from separating or offsetting from the first moving groove 300 during the movement, and further ensuring the stability of the moving process. When the mold is closed, the upper mold 1 moves downward, and the second limit block 309 provided on the front side of its lower end moves downward synchronously, so that the second inclined surface 310 on the inner side of the second limit block 309 fits with the first inclined surface 308 on the outer side of the first interference block 305, forming a rigid lock for the first interference block 305, which can effectively prevent the first interference block 305 from loosening or displacement due to the pressure generated during the molten glue filling during the injection molding process, ensure the dimensional accuracy and integrity of the front end molding structure of the product 7, and avoid defects of the product 7 caused by the displacement of the first interference block 305.

[0024] Preferably, if Figure 4 、 Figure 8 、 Figure 9 and Figure 10 As shown, the tunnel core-pulling mechanism 4 includes a transverse groove 400 arranged in the lower mold 2, the outer end of the transverse groove 400 is fixedly connected to the second cylinder 401, and the output end of the second cylinder 401 is inwardly connected to the first moving block 402, and the upper end of the first moving block 402 is provided with a third inclined surface 403, and the third inclined surface 403 is from high to low from outside to inside; a third slide groove 404 is provided in the first moving block 402, and the third slide groove 404 is parallel to the third inclined surface 403; a vertical groove 405 is provided on the lower mold 2, and the vertical groove 405 is connected to the transverse groove 400; a second interference block 406 is slidably connected in the vertical groove 405, and a second guide block 407 is provided at the lower end of the second interference block 406, and the second guide block 407 cooperates with the third slide groove 404. When the first moving block 402 moves horizontally, the second guide block 407 slides along the third slide groove 404, driving the second contact block 406 to move vertically along the vertical groove 405, thereby achieving the lifting and lowering of the core pulling end. A limiting bolt 408 is fixedly connected in the vertical groove 405; a countersunk hole 409 is provided on the second contact block 406; the limiting bolt 408 slides in cooperation with the countersunk hole 409, and the limiting effect of the bolt rod on the countersunk hole 409 further constrains the movement trajectory of the second contact block 406, preventing it from deflecting during the lifting and lowering process, thereby ensuring the accuracy of the core pulling action. When the tunnel core pulling mechanism 4 performs the core pulling operation, the second cylinder 401 is activated, and the output end of the second cylinder 401 drives the first moving block 402 in the horizontal groove 400 to move outward. Since the vertical groove 405 on the lower mold 2 is connected to the horizontal groove 400, and the second interference block 406 is slidably connected to the vertical groove 405, the vertical groove 405 forms a vertical limit for the second interference block 406, so that it can only move vertically along the vertical groove 405. When the first moving block 402 moves outward, the second guide block 407, guided by the third slide groove 404, slides from the high point to the low point of the third slide groove 404, driving the second interference block 406 to vertically descend along the vertical groove 405, and finally separates it from the surface of the second molding surface 20, completing the core pulling action.

[0025] Preferably, if Figure 4 and Figure 7As shown, the rear-side linkage core-pulling module 5 includes a second movable groove 500 arranged at the rear end of the lower mold 2 and an inclined guide rod 501 arranged below the rear end of the upper mold 1; the second movable groove 500 is inclined and arranged from outside to inside and from low to high; the inclined guide rod 501 is parallel to the second movable groove 500; third limit blocks 502 are fixedly connected on both sides of the second movable groove 500, and a fourth slide groove 503 is formed between the third limit block 502 and the bottom surface of the second movable groove 500, and a third interference block 504 is slidably connected in the fourth slide groove 503; the third interference block 504 is provided with an inclined guide hole 505, and the inclined guide hole 505 cooperates with the inclined guide rod 501. When the mold is closed, the upper mold 1 drives the inclined guide rod 501 to descend, and the inclined guide rod 501 applies an oblique thrust to the third interference block 504 through the oblique guide hole 505, so that it moves inward along the second movable groove 500. The outer side surface of the third interference block 504 is provided with a fourth inclined surface 506, which is arranged from low to high from the outside to the inside. The lower rear side of the upper mold 1 is provided with a fourth limiting block 507, and the inner side surface of the fourth limiting block 507 is provided with a fifth inclined surface 508, which is aligned with the fourth inclined surface 506. The fourth limiting block 507 is provided with a mounting hole 509, and the inclined guide rod 501 is disposed in the mounting hole 509. In the rear-side linkage core-pulling module 5, when the upper mold 1 descends during the mold closing phase, the inclined guide rod 501 descends synchronously with the upper mold 1. Due to the cooperation between the inclined guide rod 501 and the inclined guide hole 505, its descending action is converted into a driving force for the third interference block 504, prompting the third interference block 504 to gradually move inward along the inclined direction of the second movable groove 500. During this process, the third limiting blocks 502 fixedly connected on both sides of the second movable groove 500 form a fourth sliding groove 503 with the bottom surface of the groove, and the third contact block 504 slides in the fourth sliding groove 503 to ensure a stable movement trajectory until the third contact block 504 tightly contacts the rear end of the second molding surface 20, providing complete support for the rear end molding of the product 7. At the same time, the fourth limiting block 507 on the rear side of the lower end of the upper mold 1 descends together with the upper mold 1, and the fifth inclined surface 508 provided on its inner side fits with the fourth inclined surface 506 provided on the outer side of the third contact block 504. The close fit of the two inclined surfaces can effectively limit the outward movement tendency of the third contact block 504 caused by the pressure of the molten plastic during the injection molding process, further locking its position, and ensuring the dimensional accuracy and structural stability of the rear end molding of the product 7.

[0026] Preferably, if Figure 3 、 Figure 4 、 Figure 8 and Figure 9As shown, the ejection mechanism 6 includes a movable cavity 60 disposed at the lower end of the lower mold 2. A base plate 61 and a plurality of vertical guide rods 62 are disposed within the movable cavity 60. The base plate 61 is slidably connected to the vertical guide rods 62. The vertical guide rods 62 cooperate with guide holes on the base plate 61 to form a linear guide mechanism, ensuring that the base plate 61 can move in the vertical direction and prevent deviation. The base plate 61 is provided with a plurality of ejection rods 63. The lower mold 2 is provided with a plurality of ejection slots 64, which cooperate with the ejection rods 63. The second molding surface 20 is provided with a placement slot 65, which is connected to the ejection slot 64. An ejection block 66 is disposed within the placement slot 65. The lower end of the ejection block 66 is fixedly connected to the plurality of ejection rods 63. The ejection block 66 is synchronously driven by the plurality of ejection rods 63 to ensure uniform distribution of ejection force. During operation, an external hydraulic cylinder drives the base plate 61 upward, causing the ejector rod 63 on the base plate 61 to extend from the ejector slot 64. The ejector block 66 then rises and contacts the formed product 7. The upward thrust overcomes the adsorption and friction between the product 7 and the second forming surface 20, causing it to move upward and separate from the second forming surface 20. The ejector block 66 is located in a specific area below the product 7. By increasing the contact area with the product 7, it reduces the force per unit area, prevents local deformation or damage to the product 7 caused by small-area force, and ensures the molding quality of the product 7.

[0027] Working principle: Preparation stage before mold closing: In the front core pulling module 3, the first cylinder 302 drives the first contact block 305 to move along the inclined first moving groove 300 until it contacts the front end of the second forming surface 20, and the first guide block 306 cooperates with the second slide groove 307 to ensure smooth movement, and the first slide groove 304 formed by the first limit block 303 prevents it from escaping; in the tunnel core pulling mechanism 4, the second cylinder 401 drives the first moving block 402 to move inward, and through the cooperation of the third slide groove 404 and the second guide block 407, the second contact block 406 rises along the vertical groove 405, and its core pulling end fits with the second forming surface 20, and the limiting bolt 408 cooperates with the countersunk hole 409 to constrain the moving trajectory.

[0028] Mold closing and injection molding stage: The upper mold 1 moves downward and docks with the lower mold 2, and the first molding surface 11 and the second molding surface 20 form a closed cavity; in the rear linkage core pulling module 5, the upper mold 1 drives the inclined guide rod 501 downward, driving the third contact block 504 to move along the second movable groove 500 to contact the rear end of the second molding surface 20, and the fifth inclined surface 508 of the fourth limit block 507 is fitted and locked with the fourth inclined surface 506 of the third contact block 504; in the front core pulling module 3, the second limit block 309 of the upper mold 1 moves downward, and the second inclined surface 310 is fitted and locked with the first inclined surface 308 of the first contact block 305; the molten glue is injected into the cavity through the injection hole 12, and cooled and solidified to form.

[0029] Mold opening and core pulling stage: The upper mold 1 rises, driving the inclined guide rod 501 upward, causing the third contact block 504 to move outward along the second movable groove 500 and separate from the rear end of the product 7, completing the first core pulling; the first cylinder 302 contracts, pulling the first contact block 305 to move outward along the first movable groove 300 and separate from the front end of the product 7, realizing the second core pulling; the second cylinder 401 contracts, driving the first movable block 402 to move outward, causing the second contact block 406 to descend along the vertical groove 405 and separate from the side of the product 7, completing the third core pulling.

[0030] Demolding stage: After multiple core pulling, the ejection mechanism 6 is started, and the external equipment drives the bottom plate 61 to rise along the vertical guide rod 62. The ejection rod 63 pushes the ejection block 66 to rise through the ejection groove 64, lifting the product 7 and separating it from the second molding surface 20, and manually taking out the product 7.

Claims

1. A headlamp back panel bracket mold with a tunnel core pulling mechanism, comprising an upper mold (1) and a lower mold (2), wherein the lower end of the upper mold (1) is provided with a first molding surface (11); the upper end of the lower mold (2) is provided with a second molding surface (20), and the second molding surface (20) cooperates with the first molding surface (11); an injection hole (12) is provided through the upper mold (1), and the injection hole (12) is connected to the first molding surface (11); and the characteristics are: The mold also includes: A front core pulling module (3) is provided on the lower mold (2) and is located in front of the second molding surface (20); the front core pulling module (3) is used to support the front end of the second molding surface (20) before the product is molded and to perform forward core pulling after the product is molded; The tunnel core-pulling mechanism (4) is symmetrically arranged inside both sides of the lower mold (2); the core-pulling end of the tunnel core-pulling mechanism (4) is matched with the surface of the second molding surface (20); the tunnel core-pulling mechanism (4) is used to form a side molding structure of the product and perform side core pulling; A rear-side linkage core-pulling module (5) is arranged between the rear ends of the lower mold (2) and the upper mold (1); the rear-side linkage core-pulling module (5) is driven by the upper mold (1) to achieve support during mold closing and automatic core pulling during mold opening; An ejection mechanism (6) is arranged in the lower mold (2); the ejection mechanism (6) is used to eject the product from the second molding surface (20) during the demoulding stage.

2. The headlamp back panel bracket mold with a tunnel core pulling mechanism according to claim 1, characterized in that: The front core pulling module (3) comprises a first movable groove (300) arranged at the front end of the lower mold (2), the first movable groove (300) being inclined and arranged from low to high from outside to inside; a mounting plate (301) being provided at the front end of the first movable groove (300), and a first cylinder (302) being provided at the front end of the mounting plate (301); first limiting blocks (303) being fixedly connected to both sides of the first movable groove (300), a first sliding groove (304) being formed between the first limiting block (303) and the bottom surface of the first movable groove (300), and a first contact block (305) being slidably connected in the first sliding groove (304); a first guide block (306) being symmetrically provided at the bottom of the first movable groove (300); a second sliding groove (307) being symmetrically provided at the bottom of the first contact block (305), and the second sliding groove (307) being matched with the first guide block (306).

3. The headlamp back panel bracket mold with a tunnel core pulling mechanism according to claim 2, characterized in that: The outer side surface of the first resistance block (305) is provided with a first inclined surface (308), and the first inclined surface (308) is from low to high from the outside to the inside; the front side of the lower end of the upper mold (1) is provided with a second limit block (309), and the inner side surface of the second limit block (309) is provided with a second inclined surface (310), and the second inclined surface (310) is matched with the first inclined surface (308).

4. The headlamp back panel bracket mold with a tunnel core pulling mechanism according to claim 1, characterized in that: The tunnel core pulling mechanism (4) includes a transverse groove (400) arranged in the lower mold (2), the outer end of the transverse groove (400) is fixedly connected to the second cylinder (401), the output end of the second cylinder (401) is inwardly connected to the first moving block (402), the upper end of the first moving block (402) is provided with a third inclined surface (403), and the third inclined surface (403) is from high to low from outside to inside; the first moving block (402) is provided with a third slide groove (404), and the third slide groove (404) is parallel to the third inclined surface (403); the lower mold (2) is provided with a vertical groove (405), and the vertical groove (405) is connected to the transverse groove (400); the vertical groove (405) is slidably connected to the second contact block (406), and the lower end of the second contact block (406) is provided with a second guide block (407), and the second guide block (407) cooperates with the third slide groove (404).

5. The headlamp back panel bracket mold with a tunnel core-pulling mechanism according to claim 4, characterized in that: A limiting bolt (408) is fixedly connected in the vertical slot (405); a countersunk hole (409) is provided on the second abutting block (406); and the limiting bolt (408) is slidably engaged with the countersunk hole (409).

6. The headlamp back panel bracket mold with a tunnel core pulling mechanism according to claim 1, characterized in that: The rear-side linked core-pulling module (5) comprises a second movable groove (500) arranged at the rear end of the lower mold (2) and an inclined guide rod (501) arranged below the rear end of the upper mold (1); the second movable groove (500) is inclined and arranged from low to high from outside to inside; the inclined guide rod (501) is parallel to the second movable groove (500); third limit blocks (502) are fixedly connected to both sides of the second movable groove (500), a fourth sliding groove (503) is formed between the third limit block (502) and the bottom surface of the second movable groove (500), and a third contact block (504) is slidably connected in the fourth sliding groove (503); the third contact block (504) is provided with an inclined guide hole (505), and the inclined guide hole (505) cooperates with the inclined guide rod (501).

7. The headlamp back panel bracket mold with a tunnel core pulling mechanism according to claim 6, characterized in that: The outer side surface of the third resistance block (504) is provided with a fourth inclined surface (506), and the fourth inclined surface (506) is from low to high from the outside to the inside; the rear side of the lower end of the upper mold (1) is provided with a fourth limit block (507), and the inner side surface of the fourth limit block (507) is provided with a fifth inclined surface (508), and the fifth inclined surface (508) is matched with the fourth inclined surface (506); the fourth limit block (507) is provided with a mounting hole (509), and the inclined guide rod (501) is arranged in the mounting hole (509).

8. The headlamp back panel bracket mold with a tunnel core pulling mechanism according to claim 1, characterized in that: The ejection mechanism (6) comprises a movable cavity (60) arranged at the lower end of the lower die (2), wherein a bottom plate (61) and a plurality of vertical guide rods (62) are provided in the movable cavity (60), wherein the bottom plate (61) and the vertical guide rods (62) are slidably connected; a plurality of ejection rods (63) are provided on the bottom plate (61); and a plurality of ejection grooves (64) are provided through the lower die (2), wherein the ejection grooves (64) cooperate with the ejection rods (63).

9. The headlamp back panel bracket mold with a tunnel core pulling mechanism according to claim 8, characterized in that: A placement groove (65) is provided on the second molding surface (20), and the placement groove (65) is connected to the ejection groove (64); an ejection block (66) is provided in the placement groove (65), and the lower end of the ejection block (66) is fixedly connected to a plurality of ejection rods (63).

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