A camera housing die casting system

Abstract

The application relates to a camera shell die-casting system and belongs to the technical field of die casting. The camera shell die-casting system comprises a die and a plurality of sliders, the die is provided with a plurality of guide sliding grooves; the sliders are slidably arranged in the guide sliding grooves and jointly form a forming cavity with the inner wall of the die; the die is further provided with a cross runner and an overflow groove, the cross runner and the overflow groove are both in communication with the forming cavity; the communication port of the cross runner with the forming cavity and the communication port of the overflow groove with the forming cavity are respectively arranged at the parting position of the forming surface of the two opposite sliders and the inner wall of the forming cavity; the slider adjacent to the overflow groove is an exhaust block, the exhaust block is provided with a flow channel in communication with the overflow groove at both ends, the flow channel comprises a contraction section with a smaller inner diameter than other regions; the exhaust block is further provided with an exhaust channel, one end of the exhaust channel extends to the forming surface of the exhaust block and only allows gas to pass through, and the other end of the exhaust channel is in communication with the contraction section. The camera shell die-casting system provided by the application can improve the appearance quality of products.

Description

Technical Field

[0001] This application relates to the field of die casting technology, and more specifically, to a camera housing die casting system. Background Technology

[0002] Camera housings, especially the front housing of split-type cameras, typically have specific decorative patterns on their surfaces and require extremely high appearance quality. In die-casting production, to obtain a housing with a smooth surface and clear patterns, it is essential to effectively expel the gas from the molding cavity.

[0003] In existing die-casting mold designs, a sprue is typically included to introduce molten metal, and an overflow trough is provided to collect cooled molten metal and gas. A common layout places the sprue's connection point (i.e., the inlet) to the molding cavity and the overflow trough's connection point to the molding cavity at opposite top and bottom ends of the cavity, respectively. While this design achieves basic filling and overflow functions, it has significant drawbacks in practical applications.

[0004] Specifically, since the inlet and overflow outlet are located at opposite ends of the product, molten metal entering from one end needs to flow through the entire cavity to reach the overflow channel at the other end. During this process, gas deep within the cavity (especially gas at the molding surface far from the inlet) is often pushed and accumulated by the molten metal. Due to the flow characteristics of the gas itself and the length of the filling path, this gas cannot be completely and timely discharged through the overflow channel before the molten metal solidifies. This ultimately leads to defects such as bubbles and undercasting on the surface of the molded product, affecting the clarity of the pattern on the camera housing surface and the overall appearance quality, failing to meet the product standards with high appearance requirements. Summary of the Invention

[0005] The purpose of this application is to provide a camera housing die-casting system that can improve the appearance quality of the product and thus alleviate the aforementioned problems.

[0006] This application is achieved through the following technical solution: This application provides a camera housing die-casting system, which includes a mold and multiple sliders. The mold has multiple guide grooves. The multiple sliders are slidably disposed in the guide grooves and together with the inner wall of the mold, form a molding cavity. The mold also has a sprue and an overflow groove, both of which are connected to the molding cavity. The connection ports between the sprue and the molding cavity and the overflow groove and the molding cavity are respectively located at the parting point between the molding surface of two opposing sliders and the inner wall of the molding cavity. The slider adjacent to the overflow groove is a venting block. The venting block has a flow channel with both ends connected to the overflow groove. The flow channel includes a shrinkage section with an inner diameter smaller than other areas. The venting block also has an venting channel inside. One end of the venting channel extends to the molding surface of the venting block and only allows gas to pass through. The other end of the venting channel is connected to the shrinkage section.

[0007] In the technical solution of this application embodiment, the die-casting system can actively draw in gas from the forming surface, rather than passively waiting for the gas to be pushed into the overflow tank. Because the negative pressure generated in the venting channel actively attracts air bubbles trapped on the forming surface, the gas can be discharged in a timely manner along the shortest path, preventing air bubbles from accumulating on the forming surface and eventually being drawn into the molten metal. This active venting mechanism reduces the probability of defects such as air bubbles and undercasting on the product surface, especially for the deep forming surface far from the runner, where the venting effect is more pronounced. The final formed camera housing has a smooth surface and clear decorative patterns, fully meeting the requirements for high appearance quality.

[0008] In some embodiments, the inner diameter of the exhaust passage is smaller than the inner diameter of the contraction section.

[0009] In the technical solution of this application embodiment, a one-way gas drainage channel is constructed by setting the inner diameter of the exhaust channel to be smaller than the inner diameter of the contraction section. The exhaust channel ensures that gas can only be drawn into the flow channel from the molding cavity, avoiding the possibility of gas entering the molding cavity in reverse within the flow channel. This one-way drainage mechanism solves the problem of gas stagnation and difficulty in discharge deep within the cavity, ensuring sufficient venting even in the molding surface area far from the horizontal runner. The resulting camera housing exhibits significantly reduced defects such as bubbles and undercasting, higher clarity of decorative patterns, and reliable surface finish, meeting the stringent appearance quality requirements of high-end camera housings.

[0010] In some embodiments, the overflow channel is formed by a groove structure formed on the inner wall of the guide groove and the parting surface of the slider; both ends of the flow channel extend to the parting surface of the exhaust block for communication with the overflow channel.

[0011] In the technical solution of this application embodiment, the overflow groove is formed by the inner wall groove of the guide slide and the parting surface of the slider, which simplifies the overflow groove structure and improves the ease of cleaning. First, the overflow groove no longer needs to be deeply chiseled on the mold, but is formed by combining the existing guide slide and parting surface, reducing the difficulty of mold processing. Second, the overflow groove automatically separates after the mold is opened, and the residue is exposed to the outside, making cleaning convenient and avoiding the problem of traditional overflow grooves being deeply hidden inside the mold and difficult to clean.

[0012] In some embodiments, a buffer chamber is also provided on the exhaust duct.

[0013] In the technical solution of this application embodiment, a buffer chamber is set in the exhaust channel to achieve a smooth transition during the exhaust start-up phase and stable airflow throughout the process. During die casting startup, the buffer chamber temporarily stores the initial gas, preventing it from rushing into the still-unstable main airflow and causing directional turbulence, thus ensuring the correct establishment of the exhaust direction. In subsequent exhaust processes, the buffer chamber absorbs instantaneous fluctuations in gas flow, keeping the airflow entering the contraction section stable and avoiding impact and interference with the main airflow. This stable exhaust process allows gas deep within the molding surface to be continuously and reliably discharged, further reducing the probability of defects such as bubbles and under-casting on the product surface. The final molded camera housing has a higher surface finish and clearer decorative patterns, meeting the stringent requirements for product appearance quality.

[0014] In some embodiments, the connection port between the buffer cavity and the exhaust channel on the side near the forming surface of the exhaust block is lower than the connection port between the buffer cavity and the exhaust channel on the side near the contraction section.

[0015] In the technical solution of this application embodiment, the exhaust process is further optimized by setting the two connecting ports of the buffer chamber to a low-inlet, high-outlet relative position. First, utilizing the principle of gravity settling, trace amounts of molten metal droplets and impurities that may be entrained in the gas are separated, purifying the gas entering the flow channel and preventing contamination or blockage of the contraction section and flow channel by impurities. Second, utilizing the gravity barrier formed by the height difference enhances the buffer chamber's ability to prevent gas backflow, making the unidirectional exhaust direction more reliable. Finally, the low-inlet, high-outlet layout makes the buffer chamber's temporary storage function more stable; gas only flows out after accumulating to a certain level, avoiding premature release that interferes with the main airflow in the flow channel. This design, integrating temporary storage, purification, and backflow prevention, allows gas deep within the molding surface to be discharged more cleanly and reliably. In some embodiments, a temperature control chamber is further provided inside the exhaust block; the temperature control chamber is used to introduce a heat exchange medium to control the internal temperature of the flow channel.

[0016] In the technical solution of this application embodiment, by setting a temperature control cavity inside the venting block, active control of the internal temperature of the flow channel is achieved, solving the adverse effects of temperature fluctuations on venting efficiency. First, temperature control prevents premature condensation and accumulation of metal vapor on the inner wall of the flow channel, avoiding flow channel blockage and reduced venting cross-section, and ensuring long-term unobstructed flow of the venting channel. Second, a stable flow channel temperature keeps the gas flow state consistent, avoiding gas volume fluctuations and changes in flow resistance caused by temperature changes, making the venting process more stable and reliable. Finally, temperature control also helps to delay the thermal fatigue of the venting block material and extend the mold's service life. This temperature-controllable venting system allows gas deep within the molding cavity to be continuously and stably vented. In some embodiments, the shrinkage section is closer to the forming cavity than the temperature control cavity.

[0017] In the technical solution of this application embodiment, by placing the shrinkage section closer to the molding cavity than the temperature control cavity, the functions of the exhaust system are optimized and coordinated. The shrinkage section, being adjacent to the molding cavity, can immediately generate negative pressure to attract gas at the molding surface, resulting in rapid exhaust initiation and timely response, preventing gas from stagnating at the molding surface. The temperature control cavity, located further back, focuses on maintaining stable temperature in the latter part of the flow channel, preventing metal vapor condensation and blockage, and ensuring long-term unobstructed exhaust channels. This layout allows the entire exhaust process to have both rapid start-up response and stable continuous assurance, efficiently and reliably expelling gas deep within the molding cavity, further reducing defects such as bubbles and under-casting on the product surface.

[0018] In some embodiments, the exhaust passage extends in a tortuous manner from the shaped surface of the exhaust block to the contraction section.

[0019] In the technical solution of this application embodiment, by setting the exhaust duct as a tortuous path to increase the flow resistance of the exhaust duct, the gas flow rate through the exhaust duct is smaller under the same pressure difference. Especially in the initial stage when the gas volume is large, the exhaust duct cannot meet the main exhaust demand, and the gas will inevitably choose a wider overflow groove, so that the gas in the overflow groove can enter the flow channel before the gas in the exhaust duct enters the flow channel to form a stable flow.

[0020] In some embodiments, the exhaust block is further provided with a removable insert, and the flow channel and part of the exhaust channel are both provided in the insert.

[0021] In the technical solution of this application embodiment, the insert is designed to be detachable, allowing for individual maintenance and replacement. This avoids the entire venting block being scrapped due to damage to the flow channel or venting channel, reduces wear and tear on mold components, extends the overall service life of the venting block and the mold, and lowers equipment replacement costs. In some embodiments, the insert includes a pair of assembled bodies, wherein the flow channel and a portion of the exhaust channel are formed by the assembly of groove structures disposed on the assembled bodies.

[0022] In the technical solution of this application embodiment, the insert is split into a pair of assembled bodies, and grooves are processed on each assembled body. Then, they are assembled to form a complete flow channel and a partial exhaust channel. The processing difficulty is reduced, and each assembled body can be precisely processed and individually inspected to ensure that the groove size is accurate. The flow channel and exhaust channel (especially the shrinkage section) formed after splicing are more accurate, avoiding the exhaust effect due to overall processing errors.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the external structure of a mold for a camera housing die-casting system provided in some embodiments of this application; Figure 2 This is a partial structural schematic diagram of a mold for a camera housing die-casting system provided in some embodiments of this application; Figure 3 A cross-sectional view of a camera housing die-casting system provided in some embodiments of this application; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 Cross-sectional views of exhaust blocks provided in some embodiments of this application; Figure 6 Exploded views of exhaust blocks provided in some embodiments of this application; Figure 7 A cross-sectional view of an exhaust block provided for other embodiments of this application.

[0026] Icons: 1-Mold; 10-Guide groove; 11-Molding cavity; 12-Gateway; 13-Overflow groove; 2-Slider; 20-Ventilation block; 21-Runner; 210-Shrinkage section; 22-Ventilation channel; 220-Buffer cavity; 23-Temperature control cavity; 24-Insert; 240-Assembled body. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0029] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0032] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0033] According to some embodiments of this application, optionally, such as Figures 1-4As shown, this application provides a camera housing die-casting system, which includes a mold 1 and multiple sliders 2. The mold 1 is provided with multiple guide grooves 10. The multiple sliders 2 are slidably disposed in the guide grooves 10 and together with the inner wall of the mold 1 form a molding cavity 11. The mold 1 is also provided with a horizontal runner 12 and an overflow groove 13, both of which are connected to the molding cavity 11. The connection between the horizontal runner 12 and the molding cavity 11 and the connection between the overflow groove 13 and the molding cavity 11 are shown. The openings are respectively set at the parting point between the forming surface of the two opposing sliders 2 and the inner wall of the forming cavity 11; wherein, the slider 2 adjacent to the overflow groove 13 is a vent block 20, and the vent block 20 is provided with a flow channel 21 that is connected to the overflow groove 13 at both ends. The flow channel 21 includes a shrinkage section 210 with an inner diameter smaller than other areas; the vent block 20 is also provided with a vent duct 22, one end of which extends to the forming surface of the vent block 20 and only allows gas to pass through, and the other end of the vent duct 22 is connected to the shrinkage section 210.

[0034] Die casting is a process that uses high pressure to inject molding fluid into the forming cavity of a mold 1 to quickly form complex metal parts. The specific process is divided into four steps: mold closing, injection, pressure holding and solidification, and mold opening and part removal.

[0035] The molding cavity 11 is the core space in the die-casting mold 1 that directly shapes the final part. The molding liquid fills this space under high pressure and solidifies, ultimately forming a part that is completely identical to the molding cavity 11.

[0036] Multi-directional core pulling is a core demolding technology used in die casting, injection molding and other mold forming processes for parts with complex lateral concave and convex structures, holes and undercut structures. Its core purpose is to use multiple independently movable sliders 2 to first pull away the mold 1 components with lateral structures of the molded casting during the demolding stage, eliminate the interference between the casting and the mold 1, and then eject the casting.

[0037] The product mentioned in this application (i.e., camera housing) uses a four-sided core-pulling structure to precisely avoid the main parting lines in the four corner rounded transition areas, thereby ensuring the integrity of the product's cylindrical appearance.

[0038] In die casting, molten metal is injected into the forming cavity 11 from the gating 12 under high pressure. The molten metal first fills the area near the inlet of the gating 12, and then gradually moves towards the other end of the forming cavity 11. As the molten metal fills, the original gas in the forming cavity 11 is compressed and moves away from the inlet. In the early stage of die casting, before the molten metal reaches the overflow tank 13, the pushed gas enters the overflow tank 13 first. At this time, only gas enters the flow channel 21, without molten metal. When the gas passes through the contraction section 210 in the flow channel 21, the airflow velocity increases sharply due to the sudden decrease in cross-sectional area. According to the principles of fluid dynamics, the pressure decreases in the area where the flow velocity increases, thereby generating a negative pressure in the exhaust channel 22. This negative pressure continuously attracts bubbles that are trapped near the forming surface of the exhaust block 20, making it easier for tiny bubbles that might have been attached to the forming surface to detach and enter the exhaust channel 22.

[0039] The die-casting system provided in this application can actively extract gas from the forming surface, rather than passively waiting for the gas to be pushed into the overflow tank 13. Because the negative pressure generated in the venting channel 22 actively attracts air bubbles trapped on the forming surface, the gas can be discharged in a timely manner along the shortest path, preventing air bubbles from accumulating on the forming surface and eventually being drawn into the molten metal. This active venting mechanism reduces the probability of defects such as air bubbles and undercasting on the product surface, especially for the deep forming surface far from the horizontal runner 12, where the venting effect is more prominent. The final formed camera housing has a smooth surface and clear decorative patterns, fully meeting the requirements for high appearance quality.

[0040] The exhaust duct 22 can be designed to allow only gas to pass through by embedding permeable steel or creating tiny gaps. The permeable steel has micron-sized pores, allowing gas molecules to pass through while blocking liquid metal.

[0041] The contraction section 210 transitions smoothly with the other areas of the flow channel 21 to guide the gas smoothly into the contraction section 210.

[0042] In the specific implementation process, the exhaust channel 22 can be set as multiple branches inside the exhaust block 20 to increase the exhaust area, but all branches eventually converge near the contraction section 210 to ensure that the gas is smoothly discharged.

[0043] According to some embodiments of this application, optionally, such as Figures 3-4 As shown, the inner diameter of the exhaust passage 22 is smaller than the inner diameter of the contraction section 210.

[0044] In practical applications, molten metal is injected into the forming cavity 11 from the horizontal gating 12 and gradually pushed towards the other end. The original gas in the forming cavity 11 is compressed and moves away from the inlet. In the early stage of die casting, before the molten metal reaches the overflow tank 13, the pushed gas enters the overflow tank 13 first. At this time, only gas enters the flow channel 21. The gas first passes through the contraction section 210. Due to the smaller cross-sectional area, the airflow speed increases and the pressure decreases. The inner diameter of the exhaust channel 22 is smaller than that of the contraction section 210. This structural feature makes it a one-way air intake: on the one hand, the low-pressure area of ​​the contraction section 210 transmits negative pressure to the forming surface through the exhaust channel 22, actively attracting the gas trapped on the forming surface of the exhaust block 20; on the other hand, because the inner diameter of the exhaust channel 22 is smaller, if the gas in the flow channel 21 wants to enter the forming cavity 11 in the opposite direction through the exhaust channel 22, it needs to overcome greater flow resistance, and its flow direction is contrary to the main airflow direction of the contraction section 210, which is physically difficult to achieve. As the molten metal gradually advances to the vicinity of the overflow tank 13, gas and some of the cold, contaminated metal at the front end are pushed into the overflow tank 13. At this time, the exhaust duct 22 continues to perform its one-way suction function: it continuously draws the tiny air bubbles remaining deep in the forming surface into the flow channel 21, merges them into the main airflow, and then discharges them to the outside. Meanwhile, the molten metal in the overflow tank 13 is blocked from entering the exhaust duct 22 because the inner diameter of the exhaust duct 22 is small and only allows gas to pass through. This prevents the molten metal from entering the exhaust duct 22 and causing blockage.

[0045] In this embodiment, a one-way gas flow channel is constructed by setting the inner diameter of the exhaust channel 22 to be smaller than the inner diameter of the contraction section 210. The exhaust channel 22 ensures that gas can only be drawn into the flow channel 21 from the molding cavity 11, avoiding the possibility of gas in the flow channel 21 reversing into the molding cavity 11. This one-way flow mechanism solves the problem of gas stagnation and difficulty in discharge deep in the cavity, ensuring sufficient venting even in the molding surface area far from the horizontal runner 12. The final molded camera housing surface defects such as bubbles and undercasting are significantly reduced, the decorative patterns are clearer, and the surface finish is reliably guaranteed, meeting the stringent requirements for appearance quality of high-end camera housings.

[0046] In practical implementation, a one-way valve structure, such as an elastic diaphragm or ball valve, can be installed in the exhaust duct 22 to further enhance the unidirectionality of gas flow. When the pressure in the forming chamber 11 is higher than that in the flow channel 21, the valve opens to draw in gas; when the pressure in the flow channel 21 rises abnormally, the valve automatically closes to block the reverse airflow. Alternatively, directional microstructures, such as fish scale or serrated patterns, can be machined on the inner wall of the exhaust duct 22 to reduce resistance when the gas flows in the direction of intake and increase resistance when it flows in the opposite direction, achieving unidirectional flow at the physical level. Furthermore, the exhaust duct 22 can be designed as a gradient structure with gradually changing inner diameters, with the inner diameter being smallest at the end closest to the forming surface and gradually increasing at the end furthest from the forming surface. This gradient design enhances the unidirectional resistance at the inlet and reduces the flow resistance after the gas is drawn in, achieving a balance between unidirectionality and exhaust efficiency.

[0047] According to some embodiments of this application, optionally, such as Figures 3-4 As shown, the overflow groove 13 is formed by the groove structure opened on the inner wall of the guide groove 10 and the parting surface of the slider 2; both ends of the flow channel 21 extend to the parting surface of the exhaust block 20 for communication with the overflow groove 13.

[0048] This embodiment simplifies the structure of the overflow groove 13 and improves its cleaning convenience by setting the overflow groove 13 to be formed by the inner wall groove of the guide groove 10 and the parting surface of the slider 2. First, the overflow groove 13 no longer needs to be deeply chiseled on the mold 1, but is formed by combining the existing guide groove 10 and parting surface, reducing the processing difficulty of the mold 1. Second, the overflow groove 13 automatically separates after the mold is opened, and the residue is exposed to the outside, making cleaning convenient and avoiding the problem of the traditional overflow groove 13 being deeply hidden inside the mold 1 and difficult to clean.

[0049] By extending both ends of the flow channel 21 to the parting surface of the vent block 20, a precise connection between the flow channel 21 and the overflow groove 13 is achieved. This connection method with an open parting surface provides good sealing, ensuring that gas and molten metal can smoothly enter the flow channel 21 from the overflow groove 13 without leakage or blockage at the connection. At the same time, the flow channel 21 is completely integrated into the vent block 20 and moves with the slider 2, further simplifying the structure of the mold 1.

[0050] According to some embodiments of this application, optionally, such as Figures 3-4 As shown, a buffer chamber 220 is also provided on the exhaust duct 22.

[0051] In practical applications, when the molten metal just begins to push the gas towards the overflow tank 13, the airflow in the flow channel 21 is in a highly unstable state. At this time, gas has just begun to pass through the contraction section 210, and the airflow direction has not yet been fully established, so there may still be brief turbulence or fluctuations. At this critical moment, the pushed gas may first enter the exhaust block 20 from the forming cavity 11 through the exhaust channel 22. Without the buffer chamber 220, this initial gas would directly rush into the contraction section 210. Since the main airflow direction in the flow channel 21 is not yet stable, this sudden influx of airflow may impact and interfere with the main airflow that is being established, causing airflow turbulence and even potentially creating local eddies, affecting the smoothness of subsequent exhaust. In this embodiment, when the initial gas enters through the exhaust channel 22, it first enters the buffer chamber 220. The buffer chamber 220 acts as a temporary gas reservoir, temporarily accommodating this gas so that it does not immediately rush into the contraction section 210 and interfere with the establishment of the main airflow. At this time, the main airflow in the flow channel 21 is gradually accelerating and its direction is gradually stabilizing. Once the main airflow in channel 21 establishes a stable flow direction, a stable low-pressure zone and directional airflow are formed in the contraction section 210. At this time, the buffer chamber 220 begins to smoothly release the temporarily stored gas, allowing it to smoothly enter the contraction section 210 and merge into the main airflow before being discharged to the outside. Since the main airflow has stabilized, this released gas can be smoothly received and carried away without causing disturbance. As the molten metal gradually advances to the vicinity of the overflow tank 13, more gas and a small amount of cold-stained metal enter the overflow tank 13. At this time, the exhaust channel 22 continues to draw in gas from the forming surface, and the buffer chamber 220 continues to play its buffering role: when there are instantaneous fluctuations in gas flow, the buffer chamber 220 can absorb the peaks and fill the troughs, keeping the airflow entering the contraction section 210 stable and avoiding impact on the stable main airflow.

[0052] This embodiment achieves a smooth transition during the exhaust initiation phase and stable airflow throughout the entire process by setting a buffer chamber 220 on the exhaust channel 22. During die casting initiation, the buffer chamber 220 temporarily stores the initial gas, preventing it from rushing into the still-unstable main airflow in the flow channel 21 and causing directional turbulence, thus ensuring the correct establishment of the exhaust direction. In subsequent exhaust processes, the buffer chamber 220 absorbs instantaneous fluctuations in gas flow, keeping the airflow entering the contraction section 210 stable and avoiding impact and interference with the main airflow. This stable exhaust process allows gas deep within the molding surface to be continuously and reliably discharged, further reducing the probability of defects such as bubbles and under-casting on the product surface. The final molded camera housing has a higher surface finish and clearer decorative patterns, meeting the stringent requirements for product appearance quality.

[0053] In the specific implementation process, the buffer chamber 220 should be set at one end of the exhaust channel 22 near the forming surface so that the gas can be temporarily stored as soon as it enters the exhaust channel 22.

[0054] According to some embodiments of this application, optionally, such as Figure 7 As shown, the connection between the buffer cavity 220 and the exhaust channel 22 on the side near the forming surface of the exhaust block 20 is lower than the connection between the buffer cavity 220 and the exhaust channel 22 on the side near the contraction section 210.

[0055] In practical applications, when gas enters the buffer chamber 220 through the exhaust channel 22 near the connecting port (low position port) of the forming surface, the gas naturally diffuses upwards into the buffer chamber 220 after entering due to the low position of the air inlet.

[0056] During this process, if the gas contains trace amounts of molten metal droplets or impurities (such as tiny particles formed by high-temperature evaporation or splashing), these denser substances will naturally sink under gravity after entering the buffer chamber 220, accumulating at the bottom of the chamber. The gas, on the other hand, continues to flow upwards, preparing to be discharged from the outlet. This achieves the separation of the gas from the trace impurities, preventing these impurities from continuing to move forward with the gas.

[0057] When the main airflow in flow channel 21 is not yet fully stable, the buffer chamber 220 temporarily stores the gas entering from the forming surface. Because the outlet is positioned high, the gas temporarily stored in the buffer chamber 220 needs to accumulate to a certain amount and generate sufficient pressure before it can be pushed upwards and flow out from the high-position outlet. This design makes the temporary storage function of the buffer chamber 220 more reliable, preventing gas from easily flowing out and causing interference before the main airflow in flow channel 21 is stable.

[0058] As the die-casting process continues, the exhaust channel 22 continuously draws the gas from the molding surface into the buffer chamber 220. Trace impurities in the gas continuously settle and accumulate at the bottom of the buffer chamber 220, while the purified gas flows out smoothly from the high-level port, achieving continuous exhaust and purification.

[0059] This embodiment further optimizes the exhaust process by setting the two connecting ports of the buffer chamber 220 to a low-inlet, high-outlet relative position. First, utilizing the principle of gravity settling, trace amounts of molten metal droplets and impurities that may be entrained in the gas are separated, purifying the gas entering the flow channel 21 and preventing contamination or blockage of the contraction section 210 and the flow channel 21 by impurities. Second, the gravity barrier formed by the height difference enhances the buffer chamber 220's ability to prevent gas backflow, making the unidirectional exhaust direction more reliable. Finally, the low-inlet, high-outlet layout makes the temporary storage function of the buffer chamber 220 more stable; gas only flows out after accumulating to a certain level, avoiding premature release that interferes with the main airflow in the flow channel 21. This integrated design of temporary storage, purification, and backflow prevention allows gas deep within the molding surface to be discharged more cleanly and reliably.

[0060] According to some embodiments of this application, optionally, such as Figures 3-4 As shown, a temperature control chamber 23 is also provided inside the exhaust block 20; the temperature control chamber 23 is used to introduce heat exchange medium to control the internal temperature of the flow channel 21.

[0061] The selection of the heat exchange medium mentioned in this application depends on the required temperature range and heating / cooling rate. Commonly used media include water (suitable for cooling), thermal oil (suitable for medium-temperature heating), and air (suitable for mild temperature control). For scenarios requiring rapid response, media with large heat capacity and good thermal conductivity can be selected; for scenarios requiring high precision, media with good temperature stability can be selected.

[0062] During the die-casting process, the temperature inside the runner 21 has a significant impact on the exhaust efficiency. If the temperature of the runner 21 is too low, the metal vapor in the gas entering the runner 21 may condense prematurely, adhering to the inner wall of the runner 21 and gradually accumulating, causing the runner 21 to narrow or even become blocked. If the temperature of the runner 21 is too high, the gas volume expands excessively, which may increase exhaust resistance. At the same time, high temperature will also accelerate the thermal fatigue of the exhaust block 20 material. In this embodiment, the internal temperature of the runner 21 is actively controlled by the temperature control chamber 23 to keep it within an ideal range conducive to exhaust.

[0063] Before die casting begins, the target temperature of the flow channel 21 is set according to process requirements. A heat exchange medium is introduced around the flow channel 21 through the temperature control chamber 23 to preheat the flow channel 21 to the set temperature. For example, in continuous die casting production, if the temperature of the flow channel 21 is too low after the previous production run, a heating medium can be introduced for preheating to ensure that the flow channel 21 is at the optimal operating temperature when gas enters.

[0064] During the die-casting process, high-temperature molten metal continuously flows through the forming cavity 11 and overflow groove 13, and its heat is conducted to the exhaust block 20 and the flow channel 21. The temperature control cavity 23 continuously circulates a heat exchange medium to remove excess heat or supplement insufficient heat, keeping the temperature of the flow channel 21 stable. When the temperature of the flow channel 21 tends to rise, a cooling medium is introduced to lower the temperature; when the temperature of the flow channel 21 tends to decrease, a heating medium is introduced to raise the temperature.

[0065] Gas enters the flow channel 21 from the forming cavity 11 through the exhaust channel 22, flows through the contraction section 210, and is then discharged to the outside. Throughout the process, because the temperature of the flow channel 21 is precisely controlled, the metal vapor in the gas will not condense and adhere prematurely due to excessive cooling, nor will it expand excessively due to excessive heating, affecting the flow. The inner wall of the flow channel 21 remains clean and smooth at all times, ensuring smooth and unobstructed gas flow.

[0066] After die casting is completed, if it is necessary to stop the machine or replace mold 1, the flow channel 21 can be quickly cooled through the temperature control chamber 23 to facilitate subsequent operations.

[0067] This embodiment achieves active temperature control of the flow channel 21 by setting a temperature control cavity 23 within the exhaust block 20, thus solving the adverse effects of temperature fluctuations on exhaust efficiency. Firstly, temperature control prevents premature condensation and accumulation of metal vapor on the inner wall of the flow channel 21, avoiding blockage and reduced exhaust cross-section, and ensuring long-term unobstructed exhaust flow. Secondly, a stable flow channel 21 temperature maintains consistent gas flow, preventing gas volume fluctuations and changes in flow resistance caused by temperature variations, making the exhaust process more stable and reliable. Finally, temperature control also helps delay thermal fatigue of the exhaust block 20 material, extending the service life of the mold 1. This temperature-controllable exhaust system allows for the continuous and stable discharge of gas deep within the molding cavity 11.

[0068] According to some embodiments of this application, optionally, such as Figures 3-4 As shown, the shrinkage section 210 is closer to the forming cavity 11 than the temperature control cavity 23.

[0069] In practical applications, when gas enters the flow channel 21 from the forming cavity 11 via the exhaust channel 22, it first reaches the contraction section 210. Because the contraction section 210 is closer to the forming cavity 11, the gas immediately faces a sudden decrease in cross-sectional area upon entering the flow channel 21, resulting in a rapid increase in flow velocity and a rapid decrease in pressure. This low-pressure area adjacent to the forming cavity 11 transmits negative pressure to the forming surface through the exhaust channel 22, immediately attracting the gas trapped on the forming surface and achieving rapid exhaust. After accelerating through the contraction section 210, the gas continues to flow deeper into the flow channel 21, entering the area where the temperature is regulated by the temperature control chamber 23. The temperature control chamber 23 maintains a stable temperature on the inner wall of the flow channel 21 in this area through a heat exchange medium. When the gas flows through this area, due to the suitable temperature, any trace amounts of metal vapor that may be entrained in the gas will not condense and adhere to the inner wall of the flow channel 21 due to excessive cooling, nor will it expand excessively due to overheating, affecting the flow. The flow channel 21 remains unobstructed, and the gas continues to flow smoothly to the outlet and is discharged to the outside.

[0070] This embodiment optimizes the division of labor and coordination of the exhaust system functions by placing the contraction section 210 closer to the forming cavity 11 than the temperature control cavity 23. The contraction section 210, being adjacent to the forming cavity 11, can immediately generate negative pressure to attract gas at the forming surface, resulting in rapid exhaust initiation and timely response, preventing gas from stagnating at the forming surface. The temperature control cavity 23, located further back, focuses on maintaining a stable temperature in the rear section of the flow channel 21, preventing metal vapor condensation and blockage, and ensuring long-term unobstructed exhaust channels. This layout provides both rapid initiation response and stable continuous protection throughout the exhaust process, efficiently and reliably expelling gas deep within the forming cavity 11, further reducing defects such as bubbles and under-casting on the product surface.

[0071] The temperature control chamber 23 is located behind the contraction section 210 because metal vapor condensation blockage mainly occurs deep within the flow channel 21, where the gas flow rate is relatively slow and the temperature is relatively low, rather than in the contraction section 210 where the flow rate is fast and the temperature is high. By concentrating temperature control resources in the area most prone to blockage, precise temperature control and efficient blockage prevention are achieved.

[0072] According to some embodiments of this application, optionally, such as Figure 5 As shown, the exhaust channel 22 extends in a tortuous manner from the shaped surface of the exhaust block 20 to the contraction section 210.

[0073] The exhaust channel 22 extends in a tortuous manner from the forming surface of the exhaust block 20 to the shrinkage section 210, so that the exhaust channel 22 changes direction multiple times during the process from the forming surface to the shrinkage section 210, forming a serpentine, wavy, spiral or other tortuous path.

[0074] In this embodiment, by setting the exhaust duct 22 as a tortuous path to increase the flow resistance of the exhaust duct 22, the gas flow rate through the exhaust duct 22 is smaller under the same pressure difference. Especially in the initial stage when the gas volume is large, the exhaust duct 22 cannot meet the main exhaust demand, and the gas will inevitably choose the wider overflow groove 13, so that the gas in the overflow groove 13 can enter the flow channel 21 before the gas in the exhaust duct 22 enters the flow channel 21 to form a stable airflow.

[0075] According to some embodiments of this application, optionally, such as Figures 3-7 As shown, the exhaust block 20 is also provided with a removable insert 24, and the flow channel 21 and part of the exhaust channel 22 are both provided in the insert 24.

[0076] Insert 24 is designed to be detachable, allowing for individual maintenance and replacement. This prevents the entire exhaust block 20 from being scrapped due to damage to the flow channel 21 and exhaust channel 22, reduces wear and tear on mold 1 components, extends the overall service life of the exhaust block 20 and mold 1, and lowers equipment replacement costs.

[0077] According to some embodiments of this application, optionally, such as Figures 5-6 As shown, the insert 24 includes a pair of assembled bodies 240, and the flow channel 21 and a portion of the exhaust channel 22 are assembled by a groove structure provided on the assembled body 240.

[0078] The structure of the flow channel 21 and part of the exhaust channel 22 is relatively complex. If it is directly processed on the integral insert 24, it is difficult to control the precision. However, this application splits the insert 24 into a pair of assemblies 240, processes grooves on each assembly 240, and then assembles them to form a complete flow channel 21 and part of the exhaust channel 22. The processing difficulty is reduced, and each assembly 240 can be precisely processed and inspected individually to ensure the accuracy of the groove dimensions. The flow channel 21 and exhaust channel 22 (especially the contraction section 210) formed after splicing have higher precision, avoiding the impact of overall processing errors on the exhaust effect. The design of the assembly 240 can be disassembled for maintenance and individual replacement. When the flow channel 21 and exhaust channel 22 are blocked or worn, it is not necessary to disassemble the entire insert 24 for overall repair. The assembly 240 can be disassembled for cleaning and repair. When a single assembly 240 is damaged, it is not necessary to replace the entire insert 24. Only the damaged assembly 240 needs to be replaced, which reduces maintenance costs and consumable consumption and reduces equipment downtime.

[0079] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A camera housing die-casting system, characterized in that, include: The mold is equipped with multiple guide grooves; Multiple sliders are slidably disposed in the guide groove and together with the inner wall of the mold to form a molding cavity; The mold is also provided with a horizontal runner and an overflow groove, both of which are connected to the molding cavity; The connection between the horizontal runner and the molding cavity and the connection between the overflow groove and the molding cavity are respectively located at the parting point between the molding surface of the two opposite sliders and the inner wall of the molding cavity. The slider adjacent to the overflow channel is an exhaust block, and the exhaust block has a flow channel that is connected to the overflow channel at both ends. The flow channel includes a constriction section with an inner diameter smaller than other areas. The exhaust block is also provided with an exhaust channel inside. One end of the exhaust channel extends to the forming surface of the exhaust block and only allows gas to pass through. The other end of the exhaust channel is connected to the shrinkage section.

2. The camera housing die-casting system according to claim 1, characterized in that, The inner diameter of the exhaust passage is smaller than the inner diameter of the contraction section.

3. The camera housing die-casting system according to claim 1, characterized in that, The overflow groove is formed by a groove structure formed on the inner wall of the guide groove and the parting surface of the slider; Both ends of the flow channel extend to the parting surface of the exhaust block for communication with the overflow groove.

4. The camera housing die-casting system according to claim 1, characterized in that, The exhaust duct is also equipped with a buffer chamber.

5. A camera housing die-casting system according to claim 4, characterized in that, The connection between the buffer cavity and the exhaust channel on the side near the forming surface of the exhaust block is lower than the connection between the buffer cavity and the exhaust channel on the side near the contraction section.

6. A camera housing die-casting system according to claim 1, characterized in that, The exhaust block is also equipped with a temperature control chamber; The temperature control cavity is used to introduce a heat exchange medium to control the internal temperature of the flow channel.

7. A camera housing die-casting system according to claim 6, characterized in that, The shrinkage section is closer to the forming cavity than the temperature control cavity.

8. A camera housing die-casting system according to claim 1, characterized in that, The exhaust channel extends in a tortuous manner from the shaped surface of the exhaust block to the contraction section.

9. A camera housing die-casting system according to claim 1, characterized in that, The exhaust block is also provided with a detachable insert, and the flow channel and part of the exhaust channel are both disposed within the insert.

10. A camera housing die-casting system according to claim 9, characterized in that, The insert includes a pair of assembled bodies, wherein the flow channel and a portion of the exhaust channel are formed by the assembly of groove structures disposed in the assembled bodies.

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