Street lamp die casting and intelligent die casting production method thereof

Abstract

The application discloses a street lamp die casting and an intelligent die casting production method thereof, and relates to the technical field of street lamp production.The street lamp die casting comprises a lamp shell body, the lamp shell body is in a structure with a closed top surface and an open bottom end, the lamp shell body is internally provided with a first mounting cavity for mounting a lamp and a second mounting cavity for mounting electrical elements, a mounting portion for being connected with a lamp pole is arranged on the side wall of the lamp shell body, a plurality of outward protruding heat dissipation fins are arranged on the top surface of the lamp shell body, and the lamp shell body, the first mounting cavity, the second mounting cavity, the mounting portion and the heat dissipation fins are integrally die casted.The application designs special cooling channels and sliding plug control structures in view of the problem that the heat dissipation fins are prone to excessive cooling, and combines a temperature sensing adjusting assembly, so that the cooling strategy can be flexibly adjusted according to the actual cooling requirements of the heat dissipation fin area in different die casting stages, the problem of excessive cooling of the heat dissipation fins caused by overall cooling is effectively improved, and the casting quality is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of street light manufacturing technology, specifically to a street light die casting part and its intelligent die casting production method. Background Technology

[0002] Streetlights play a crucial role in modern urban lighting systems. The lamp housing, as a key component protecting the internal light source, electrical components, and ensuring effective heat dissipation, directly impacts the overall lifespan and lighting performance of the streetlight. Die-casting technology, with its advantages of high efficiency, high precision, and the ability to manufacture complex shapes, is widely used in streetlight housing production.

[0003] Currently, most common lamp housing die-casting molds employ integral cooling. While this cooling strategy can achieve solidification of the casting to some extent, it has significant limitations. Take the heat dissipation fins commonly found on streetlight housings as an example. These fins are typically integrally molded onto the lamp housing, and their structure is relatively thinner and lighter than other parts of the housing. During integral cooling, due to the large surface area to volume ratio of the heat dissipation fins, heat dissipation occurs much faster than in the main body of the lamp housing, easily leading to over-cooling of the heat dissipation fins.

[0004] Excessive cooling has numerous negative effects on lamp housing quality. Firstly, within the casting, excessive cooling causes the molten metal at the heat sink fins to solidify rapidly, resulting in poor fusion with the subsequently filled molten metal and leading to cold shut defects. Cold shuts not only severely affect the appearance of the lamp housing but also create stress concentration points, reducing the structural strength of the housing. During street light use, when subjected to external forces such as wind and vibration, cracks are highly likely to propagate at the cold shut points, ultimately causing the lamp housing to break, seriously affecting the safety and lifespan of the street light. Secondly, excessive cooling causes abnormal changes in the metal microstructure in the heat sink fin area, resulting in uneven grain refinement and segregation. This not only reduces the material's mechanical properties but also significantly decreases the corrosion resistance of this area. In complex outdoor environments, the heat sink fins are more susceptible to corrosion from rainwater and salt, shortening the overall lifespan of the lamp housing.

[0005] In view of the above, this application is hereby submitted. Summary of the Invention

[0006] The purpose of this invention is to provide a street lamp die casting part and its intelligent die casting production method to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides a street lamp die-casting part, including a lamp housing body. The lamp housing body has a closed top surface and an open bottom structure. The lamp housing body has a first mounting cavity for installing lamps and a second mounting cavity for installing electrical components. A mounting part for connecting with a lamp pole is provided on the side wall of the lamp housing body. Multiple outwardly protruding heat dissipation fins are provided on the top surface of the lamp housing body. The lamp housing body, the first mounting cavity, the second mounting cavity, the mounting part, and the heat dissipation fins are integrally die-cast.

[0008] Furthermore, the main body of the lamp housing is made of aluminum alloy, which contains 90% aluminum, 4% magnesium, and 6% silicon to enhance the strength and heat dissipation performance of the material.

[0009] The height of the heat dissipation fins is equal to the height of the side wall of the lamp housing. Furthermore, the spacing between adjacent heat dissipation fins is 5mm-10mm;

[0010] The depth of the first mounting cavity is 3mm-5mm, and the depth of the second mounting cavity is 5mm-8mm.

[0011] A smart die-casting production method includes the following steps:

[0012] S1. Mold preparation steps: Install the designed die-casting mold onto the die-casting machine and preheat the mold to 180-220℃;

[0013] S2. Raw material preparation steps: Heat the aluminum alloy raw material to 680-720℃ to completely melt it, and then degas and refine it to remove impurities and bubbles.

[0014] S3. Die casting step: The molten aluminum alloy raw material is injected into the pressure chamber of the die casting machine through the feeding equipment. The die casting machine is started and the aluminum alloy liquid is pressed into the mold cavity at high speed with a pressure of 50-80MPa. The holding time is 3-5s.

[0015] S4. Intelligent monitoring and adjustment steps: During the die casting process, temperature and pressure data are collected in real time by temperature sensors and pressure sensors installed in the mold cavity, pressure chamber and key parts of the die casting machine, and transmitted to the control system. When the temperature or pressure data deviates from the preset range, the control system automatically adjusts the heating power, injection speed and pressure of the die casting machine to ensure the stability of the die casting process.

[0016] S5. Demolding step: After die casting is completed, coolant is injected into the mold cooling channel by a liquid pump to cool the mold to 80-120℃. The demolding device is activated and the molded street lamp die casting is ejected from the mold by ejector pins.

[0017] S6. Post-processing steps: Deburring and grinding are performed on the demolded street light die castings, and airtightness and appearance quality are tested. Qualified products are packaged and put into storage.

[0018] Furthermore, the temperature sensor is a type K thermocouple, which is installed on the top, bottom, and side walls of the mold cavity, as well as the inlet and outlet of the pressure chamber;

[0019] The pressure sensor is a strain gauge type pressure sensor, which is installed on the injection cylinder and the pressure holding cylinder of the die casting machine;

[0020] When the temperature data deviates from the preset range of ±5℃, adjust the heating power by 5-10kW; when the pressure data deviates from the preset range of ±3MPa, adjust the injection speed by 0.1-0.3m / s and the pressure by 2-5MPa.

[0021] In step S6, deburring is performed by vibration grinding for 10-15 minutes, and the grinding medium is alumina particles.

[0022] In step S6, the airtightness test is performed using a helium leak detector at a pressure of 0.5-0.8 MPa and a holding time of 2-3 minutes, with a leakage rate not exceeding 5 × 10⁻⁶. -6 Pa·m / s is considered acceptable.

[0023] Further, in step S1, the die-casting mold includes an upper mold and a lower mold that cooperate with each other. The upper mold is provided with a protruding structure that matches the shape of the bottom opening of the lamp housing body. The lower mold is provided with a groove structure that corresponds to the shape of the top of the lamp housing body and the heat dissipation fins. The upper mold is provided with a filling port for injecting aluminum alloy liquid into the groove structure. The interior of both the upper mold and the lower mold is provided with a main cooling channel arranged around the protruding structure and the groove structure. The upper mold and the lower mold are both provided with a liquid injection port and a first liquid outlet that connect to the main cooling channel.

[0024] Furthermore, a main liquid outlet pipe is connected to the first liquid outlet on the lower mold. The lower mold has an auxiliary cooling channel surrounding the heat dissipation fins in the groove structure. The lower mold also has a second liquid outlet, one end of which is connected to the auxiliary cooling channel and the other end of which is connected to the auxiliary liquid outlet pipe. A first diversion pipe and a second diversion pipe are connected to the side wall of the main liquid outlet pipe. The end of the first diversion pipe away from the main liquid outlet pipe is connected to the auxiliary cooling channel, and the end of the second diversion pipe away from the main liquid outlet pipe is connected to the auxiliary liquid outlet pipe. A sliding plug is slidably installed inside the main liquid outlet pipe. A flow channel is opened on the sliding plug. When the sliding plug is in its initial position, the flow channel is connected to the first diversion pipe. When the sliding plug slides down to the second position, the outer wall of the sliding plug blocks the first diversion pipe, and the flow channel is connected to the second diversion pipe. A temperature sensing adjustment component is provided on the outer wall of the lower mold for adjusting the vertical sliding of the sliding plug to block / open the first diversion pipe and the second diversion pipe.

[0025] Furthermore, the temperature sensing adjustment component includes a rotating wheel rotatably mounted on the side wall of the lower mold, a connecting rod rotatably mounted on the outer end face of the rotating wheel, a sliding rod slidably mounted on the bottom wall of the main liquid outlet pipe, and the end of the connecting rod away from the rotating wheel is hinged to the sliding rod.

[0026] Furthermore, the temperature sensing adjustment component also includes a first gear coaxially mounted with the rotating wheel and a long rack slidably disposed on the front end face of the lower mold. The long rack meshes with the first gear. An installation shell is installed on the outer wall of the auxiliary liquid outlet pipe. A second gear meshing with the long rack is rotatably mounted inside the installation shell. A third gear is coaxially mounted on the second gear. An extension tube extending radially is provided on the side wall of the auxiliary liquid outlet pipe. A shape memory metal sheet is installed inside the extension tube. A short rack is connected to the shape memory metal sheet. The short rack meshes with the third gear.

[0027] Furthermore, a sliding opening is provided on the side wall of the mounting housing, and the long rack is slidably connected inside the sliding opening.

[0028] Furthermore, the first diversion pipe is located on the upper side wall of the main outlet pipe, the second diversion pipe is located on the lower side wall of the main outlet pipe, and the first diversion pipe is located above the second diversion pipe.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. In view of the problem that heat dissipation fins are prone to overcooling, this invention innovatively designs a heat dissipation method that uses the main cooling channel to return the coolant. The coolant in the main cooling channel, after heat exchange, has a certain temperature and is transported to the secondary cooling channel set around the heat dissipation fins. This differential temperature cooling strategy offers multiple advantages. In the initial stage of die casting, the heat dissipation fins are in contact with the high-temperature molten metal, resulting in a high demand for heat dissipation. At this time, the relatively low-temperature main cooling channel recirculates coolant into the secondary cooling channel, rapidly removing a large amount of heat and effectively suppressing the heating rate of the heat dissipation fins. As the die casting process progresses, the overall temperature of the mold decreases, and the temperature of the heat dissipation fins gradually decreases as well. At this point, coolant with a certain temperature continues to flow in, preventing quality defects caused by over-cooling of the heat dissipation fins. Compared to traditional single-temperature cooling media, this staged, adaptive cooling method can more accurately match the heat dissipation needs of the heat dissipation fins at different stages of die casting, optimizing the heat dissipation effect and significantly improving the quality of the casting. Combined with a specialized sliding plug control structure and temperature sensing adjustment components, the coolant flow rate and direction can be flexibly adjusted according to the actual temperature conditions, further ensuring the adaptability of the cooling system and optimizing the cooling effect on the heat dissipation fin area.

[0031] 2. This invention addresses the problem of overcooling of heat sink fins by designing a dedicated cooling channel and a sliding plug control structure. Combined with a temperature sensing adjustment component, it can flexibly adjust the cooling strategy according to the actual cooling needs of the heat sink fin area at different stages of die casting. This effectively improves the overcooling problem caused by overall cooling of the heat sink fins, significantly improving the quality of the casting. The simple and reliable temperature sensing adjustment component, along with the reasonable layout of the distribution pipes, further ensures the adaptability of the cooling system and optimizes the cooling effect on the heat sink fin area. Attached Figure Description

[0032] Figure 1 This is a top view of the die-cast street light component in this invention.

[0033] Figure 2 This is a bottom view of the die-cast street light component in this invention.

[0034] Figure 3 This is a schematic diagram of the die-casting mold in this invention;

[0035] Figure 4 This is a schematic cross-sectional view of the die-casting mold in this invention;

[0036] Figure 5 This is a front view structural diagram of the die-casting mold in this invention;

[0037] Figure 6 For along Figure 5 A schematic diagram of the cross-sectional structure along the center section AA;

[0038] Figure 7This is a front view schematic diagram of the temperature sensing and adjustment component in a die-casting mold;

[0039] Figure 8 This is a rear view schematic diagram of the temperature sensing and adjustment component in a die-casting mold;

[0040] Figure 9 This is a schematic cross-sectional view of the main outlet pipe in this invention.

[0041] In the diagram: 1. Lamp housing body; 2. First mounting cavity; 3. Second mounting cavity; 4. Mounting part; 5. Heat dissipation fins; 6. Upper mold; 7. Lower mold; 8. Injection port; 9. Protruding structure; 10. Groove structure; 11. Main cooling channel; 12. Secondary cooling channel; 13. Second liquid outlet; 14. Injection port; 15. First liquid outlet; 16. Main liquid outlet pipe; 17. First branch pipe; 18. Second branch pipe; 19. Secondary liquid outlet pipe; 20. Rotating wheel; 21. Connecting rod; 22. Slide rod; 23. First gear; 24. Long rack; 25. Mounting shell; 26. Sliding plug; 27. Second gear; 28. Third gear; 29. ​​Extension pipe; 30. Shape memory metal sheet; 31. Short rack; 32. Flow channel. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figures 1-9 The present invention provides a technical solution: a street lamp die casting part, including a lamp housing body 1, the lamp housing body 1 having a closed top surface and an open bottom surface structure, the lamp housing body 1 having a first mounting cavity 2 for mounting lamps and a second mounting cavity 3 for mounting electrical components inside, a mounting part 4 for connecting with a lamp pole is provided on the side wall of the lamp housing body 1, and a plurality of outwardly protruding heat dissipation fins 5 are provided on the top surface of the lamp housing body 1, the lamp housing body 1, the first mounting cavity 2, the second mounting cavity 3, the mounting part 4 and the heat dissipation fins 5 are integrally die-cast.

[0044] Specifically, the specific aluminum alloy material ensures that the lamp housing has good strength to resist external forces, excellent heat dissipation performance extends the service life of internal components, reasonable heat dissipation fin size optimizes heat dissipation effect, and precise mounting cavity depth facilitates the installation of lamps and electrical components, improving assembly accuracy.

[0045] The main body of the lamp housing 1 is made of aluminum alloy, which contains 90% aluminum, 4% magnesium and 6% silicon to enhance the strength and heat dissipation performance of the material.

[0046] The height of heat dissipation fin 5 is equal to the height of the side wall of the lamp housing body 1. Furthermore, the spacing between adjacent heat dissipation fins 5 is 5mm-10mm;

[0047] The depth of the first mounting cavity 2 is 3mm-5mm, and the depth of the second mounting cavity 3 is 5mm-8mm.

[0048] Specifically,.

[0049] A smart die-casting production method includes the following steps:

[0050] S1. Mold preparation steps: Install the designed die-casting mold onto the die-casting machine and preheat the mold to 180-220℃;

[0051] S2. Raw material preparation steps: Heat the aluminum alloy raw material to 680-720℃ to completely melt it, and then degas and refine it to remove impurities and bubbles.

[0052] S3. Die casting step: The molten aluminum alloy raw material is injected into the pressure chamber of the die casting machine through the feeding equipment. The die casting machine is started and the aluminum alloy liquid is pressed into the mold cavity at high speed with a pressure of 50-80MPa. The holding time is 3-5s.

[0053] S4. Intelligent monitoring and adjustment steps: During the die casting process, temperature and pressure data are collected in real time by temperature sensors and pressure sensors installed in the mold cavity, pressure chamber and key parts of the die casting machine, and transmitted to the control system. When the temperature or pressure data deviates from the preset range, the control system automatically adjusts the heating power, injection speed and pressure of the die casting machine to ensure the stability of the die casting process.

[0054] S5. Demolding step: After die casting is completed, coolant is injected into the mold cooling channel by a liquid pump to cool the mold to 80-120℃. The demolding device is activated and the molded street lamp die casting is ejected from the mold by ejector pins.

[0055] S6. Post-processing steps: Deburring and grinding are performed on the demolded street light die castings, and airtightness and appearance quality are tested. Qualified products are packaged and put into storage.

[0056] Specifically, the entire intelligent die-casting production method involves close coordination of each step, from precise control of molds and raw materials to the die-casting process, and then to intelligent monitoring and adjustment, demolding and post-processing, which ensures high-quality production of street light die-cast parts, reduces scrap rate, improves production efficiency, and ensures stable and reliable product quality.

[0057] The temperature sensors are K-type thermocouples, which are installed on the top, bottom and side walls of the mold cavity, as well as the inlet and outlet of the pressure chamber.

[0058] The pressure sensor is a strain gauge type pressure sensor, which is installed on the injection cylinder and pressure holding cylinder of the die casting machine;

[0059] When the temperature data deviates from the preset range of ±5℃, adjust the heating power by 5-10kW; when the pressure data deviates from the preset range of ±3MPa, adjust the injection speed by 0.1-0.3m / s and the pressure by 2-5MPa.

[0060] In step S6, deburring is performed by vibration grinding for 10-15 minutes, and the grinding medium is alumina particles.

[0061] In step S6, the airtightness test is performed using a helium leak detector at a pressure of 0.5-0.8 MPa and a holding time of 2-3 minutes, with a leakage rate not exceeding 5 × 10⁻⁶. -6 Pa·m / s is considered acceptable.

[0062] Specifically, precise sensor selection and installation location ensure comprehensive and accurate acquisition of temperature and pressure data, providing a reliable basis for the control system and enabling precise adjustments to the die-casting process. Appropriate deburring and inspection methods guarantee the surface quality and airtightness of the castings, thereby improving the overall product quality.

[0063] Reference Figures 3-9 In step S1, the die-casting mold includes an upper mold 6 and a lower mold 7 that cooperate with each other. The upper mold 6 is provided with a protruding structure 9 that matches the shape of the bottom opening of the lamp housing body 1. The lower mold 7 is provided with a groove structure 10 that corresponds to the shape of the top of the lamp housing body 1 and the heat dissipation fins 5. The upper mold 6 is provided with an injection port 8 for injecting aluminum alloy liquid into the groove structure 10. The interior of both the upper mold 6 and the lower mold 7 is provided with a main cooling channel 11 surrounding the protruding structure 9 and the groove structure 10. The upper mold 6 and the lower mold 7 are provided with an injection port 14 and a first liquid outlet 15 that connect to the main cooling channel 11.

[0064] Specifically, the injection port 8 of the upper mold 6 is used to inject molten aluminum alloy. The upper mold 6 and the lower mold 7 are equipped with a main cooling channel 11 with a raised and grooved structure inside. The coolant is circulated through the injection port 14 and the first outlet port 15 to initially cool the mold as a whole. This mold structure design is highly compatible with the shape of the lamp housing die casting, ensuring the accuracy of die casting. The main cooling channel 11 can initially cool the mold, allowing the casting to solidify and form in a suitable temperature environment, thus improving the quality of the casting.

[0065] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 9A main outlet pipe 16 is connected to the first liquid outlet 15 located on the lower mold 7. A secondary cooling channel 12 is provided inside the lower mold 7, surrounding the heat dissipation fins 5 in the groove structure 10. A second liquid outlet 13 is also provided on the lower mold 7. One end of the second liquid outlet 13 is connected to the secondary cooling channel 12, and the other end is connected to the secondary outlet pipe 19. A first branch pipe 17 and a second branch pipe 18 are connected to the side wall of the main outlet pipe 16. The end of the first branch pipe 17 away from the main outlet pipe 16 is connected to the secondary cooling channel 12, and the second branch pipe... One end of the main outlet pipe 18 away from the main outlet pipe 16 is connected to the auxiliary outlet pipe 19. A sliding plug 26 is slidably installed inside the main outlet pipe 16. A flow channel 32 is opened on the sliding plug 26. When the sliding plug 26 is in the initial position, the flow channel 32 is connected to the first branch pipe 17. When the sliding plug 26 slides down to the second position, the outer wall of the sliding plug 26 blocks the first branch pipe 17, and the flow channel 32 is connected to the second branch pipe 18. A temperature sensing adjustment component is provided on the outer wall of the lower mold 7 for adjusting the vertical sliding of the sliding plug 26 to block / open the first branch pipe 17 and the second branch pipe 18.

[0066] Specifically, the slide plug 26 inside the main outlet pipe 16 is slidable. Initially, the flow channel 32 on the slide plug 26 is connected to the first branch pipe 17, and the coolant preferentially flows into the secondary cooling channel 12 to focus on cooling the area of ​​the heat dissipation fins 5. When the slide plug 26 slides down to the second position, the flow channel 32 is connected to the second branch pipe 18, and the coolant flows to the secondary outlet pipe 19. At this time, the cooling focus can be adjusted according to the cooling situation of the casting. The temperature sensing adjustment component on the outer wall of the lower mold 7 can adjust the sliding of the slide plug 26 according to the temperature change.

[0067] The design of this cooling channel and slide plug 26 enables targeted cooling of the heat dissipation fin 5 area. In the early stage of die casting, the heat dissipation fin 5 is cooled in a focused manner to prevent it from overcooling due to excessive heat dissipation. As the die casting process progresses, the cooling strategy can be flexibly adjusted according to the actual temperature conditions, effectively improving the problem of overcooling of the heat dissipation fin 5 caused by overall cooling and improving the quality of the casting.

[0068] Reference Figure 3 , Figure 5 , Figure 7 and Figure 8 The temperature sensing and regulating component includes a rotating wheel 20 rotatably mounted on the side wall of the lower mold 7, a connecting rod 21 rotatably mounted on the outer end face of the rotating wheel 20, and a sliding rod 22 slidably mounted on the bottom wall of the main liquid outlet pipe 16. The end of the connecting rod 21 away from the rotating wheel 20 is hinged to the sliding rod 22.

[0069] Specifically, when the rotating wheel 20 rotates, it drives the sliding rod 22 to slide through the connecting rod 21, which in turn pushes the sliding plug 26 to slide inside the main outlet pipe 16, thereby controlling the blocking or opening of the first branch pipe 17 and the second branch pipe 18. This mechanically connected temperature sensing adjustment component has a simple structure and reliable operation. It can flexibly control the position of the sliding plug 26 according to temperature changes, thereby effectively adjusting the cooling mode of the heat dissipation fin 5 area and improving the adaptability of the cooling system.

[0070] Reference Figure 3 , Figure 5 , Figure 7 and Figure 8 The temperature sensing and regulating component also includes a first gear 23 coaxially mounted with the rotating wheel 20 and a long rack 24 slidably disposed on the front end face of the lower mold 7. The long rack 24 is meshed with the first gear 23. An installation shell 25 is installed on the outer wall of the auxiliary liquid outlet pipe 19. A second gear 27 meshing with the long rack 24 is rotatably mounted inside the installation shell 25. A third gear 28 is coaxially mounted on the second gear 27. An extension tube 29 extending radially is provided on the side wall of the auxiliary liquid outlet pipe 19. A shape memory metal sheet 30 is installed inside the extension tube 29. A short rack 31 is connected to the shape memory metal sheet 30. The short rack 31 is meshed with the third gear 28.

[0071] Specifically, the shape memory metal sheet 30 inside the extension tube 29 on the side wall of the auxiliary liquid outlet pipe 19 deforms with temperature changes, driving the connected short rack 31 to move. The short rack 31 meshes with the third gear 28. When the temperature changes, the shape memory metal sheet 30 deforms, and through the transmission of the short rack 31, the third gear 28, the second gear 27, the long rack 24 and the first gear 23, it drives the rotating wheel 20 to rotate, ultimately achieving the adjustment of the position of the slide plug 26. By utilizing the temperature-sensitive characteristic of the shape memory metal sheet 30, an automatic cooling regulation system that responds to temperature changes is constructed. Without the need for an additional complex control system, the cooling strategy can be automatically adjusted according to the temperature of the heat dissipation fin 5 area during the die casting process, improving the intelligence and reliability of the cooling system.

[0072] Reference Figure 8 A sliding opening is provided on the side wall of the mounting shell 25, and the long toothed rack 24 is slidably connected inside the sliding opening.

[0073] Specifically, during the meshing and transmission process with the first gear 23 and the second gear 27, the long rack 24 is guided by the sliding port to ensure that the long rack 24 moves smoothly, thereby ensuring the stability of the transmission of the entire temperature sensing and regulating component.

[0074] The sliding port design provides a stable sliding track for the long rack 24, ensuring the accuracy and reliability of the transmission between the various components of the temperature sensing adjustment assembly, and avoiding the impact of problems such as the shaking of the long rack 24 on the adjustment accuracy of the position of the slide plug 26.

[0075] Reference Figure 9 The first diversion pipe 17 is located on the upper side wall of the main outlet pipe 16, and the second diversion pipe 18 is located on the lower side wall of the main outlet pipe 16. The first diversion pipe 17 is located above the second diversion pipe 18.

[0076] Specifically, in the initial stage of die casting, the mold temperature is high, and the heat dissipation demand of the heat dissipation fin 5 area is large. The coolant flows from the main outlet pipe 16 through the first branch pipe 17 into the secondary cooling channel 12 to focus on cooling the heat dissipation fin 5. As die casting progresses, the overall temperature of the mold decreases, and the temperature of the heat dissipation fin 5 area becomes relatively stable. The slide plug 26 slides down, and the coolant flows into the secondary outlet pipe 19 through the second branch pipe 18, which can be used to fine-tune the cooling of other parts or the overall process.

[0077] This design of the distribution pipe position layout, combined with the sliding control of the slide plug 26, can reasonably allocate the coolant flow direction according to the actual cooling needs of the heat dissipation fin 5 area at different stages of die casting, further optimize the cooling effect on the heat dissipation fin 5 area, and improve the quality of the casting.

[0078] Working principle: The lamp housing body 1 is constructed with a closed top and an open bottom structure. The interior is precisely divided into a first mounting cavity 2 and a second mounting cavity 3, which are used for the installation of the lamp and electrical components, respectively, ensuring that the installation positions of each component are clear and do not interfere with each other. A mounting part 4 is set on the side wall of the lamp housing body 1 for a stable connection with the lamp pole, ensuring the overall installation stability of the street light. An outwardly protruding heat dissipation fin 5 is added to the top surface of the lamp housing body 1, which increases the heat dissipation area by utilizing its large surface area and promotes heat dissipation. Furthermore, through an integrated die-casting process, the lamp housing body 1, the first mounting cavity 2, the second mounting cavity 3, the mounting part 4, and the heat dissipation fin 5 become a tightly connected whole, ensuring the connection strength and sealing between the parts, while optimizing the heat conduction path and improving heat dissipation efficiency.

[0079] Before die casting, the die casting mold, namely the upper mold 6 and the lower mold 7 that cooperate with each other, is accurately installed on the die casting machine. The upper mold 6 and the lower mold 7 are preheated to a temperature of 180-220℃. This preheating operation can reduce the temperature difference between the subsequently injected aluminum alloy liquid and the mold, reduce the flow resistance of the aluminum alloy liquid during the filling of the mold cavity, ensure that the aluminum alloy liquid can smoothly fill all parts of the mold, and improve the forming quality of the casting. At the same time, the aluminum alloy raw material is heated to 680-720℃ to completely melt it, and then degassing and refining treatment is carried out. Through these treatment steps, impurities and bubbles in the aluminum alloy liquid are removed, and the purity of the aluminum alloy liquid is improved, thus providing a high-quality raw material basis for the production of high-quality die castings.

[0080] Molten and treated aluminum alloy raw materials are precisely injected into the pressure chamber of the die-casting machine via a feeding device. After starting the die-casting machine, the molten aluminum alloy is forced into the mold cavity at high speed with a pressure of 50-80 MPa. After filling, a holding pressure time of 3-5 seconds is maintained. During this process, the high pressure ensures that the molten aluminum alloy tightly fills every detail of the mold cavity, ensuring the dimensional accuracy and surface quality of the casting. At the same time, the holding pressure operation helps to compact the molten aluminum alloy, reducing defects such as shrinkage cavities and porosity inside the casting, and improving the density and overall strength of the casting. Throughout the die-casting process, the material installed at the top, bottom, and side walls of the mold cavity, as well as the inlet and outlet of the pressure chamber, is used for pressure control. K-type thermocouple temperature sensors collect temperature data in real time; strain gauge pressure sensors installed on the injection cylinder and holding cylinder of the die-casting machine collect pressure data in real time. These sensors transmit the collected data to the control system in real time. When the temperature or pressure data deviates from the preset range, the control system automatically adjusts the heating power, injection speed, and pressure of the die-casting machine. For example, when the temperature data is lower than the preset range, the control system increases the heating power; when the pressure data is higher than the preset range, the control system reduces the injection speed and pressure. Through this intelligent monitoring and adjustment mechanism, the die-casting process is kept in a stable state, ensuring the consistency and stability of the casting quality.

[0081] After die casting is completed, to ensure smooth demolding and maintain the quality of the casting, coolant is injected into the main cooling channel 11, which surrounds the raised structure 9 and the grooved structure 10, and the secondary cooling channel 12, which surrounds the heat dissipation fins 5 in the lower mold 7, via a liquid pump. The coolant circulates in these channels, absorbing heat from the mold and thus lowering its temperature. When the mold cools to 80-120℃, the casting has basically solidified. The demolding device is then activated, and ejector pins push the formed street lamp die casting out of the mold. During the cooling process, the coolant in the main cooling channel 11 first exchanges heat with the entire mold, absorbing a large amount of heat and raising its temperature. Subsequently, the coolant in the main cooling channel 11, which has reached a certain temperature after heat exchange, is transported to the secondary cooling channel 12 to dissipate heat from the heat dissipation fins 5. In the initial stage of die casting, the cooling... When the heat sink 5 comes into contact with the high-temperature molten aluminum alloy, its temperature rises rapidly. At this time, the relatively low-temperature main cooling channel 11 returns the coolant to the secondary cooling channel 12, which can quickly remove a large amount of heat and effectively suppress the heating rate of the heat sink 5, avoiding quality problems caused by excessive temperature. As the die-casting process progresses, the overall temperature of the mold gradually decreases, and the temperature of the heat sink 5 also decreases accordingly. At this time, the coolant with a certain temperature continues to flow into the secondary cooling channel, providing a mild cooling environment for the heat sink 5 and avoiding quality defects such as cold shuts and cracks caused by over-cooling. This method of using coolant of different temperatures to cool the heat sink 5 in stages according to different stages of die-casting can better meet the heat dissipation needs of the heat sink 5 throughout the entire die-casting process, optimize the heat dissipation effect, and improve the quality of the casting.

[0082] To further optimize the cooling effect on the heat dissipation fins 5, a sliding plug 26 is provided inside the main liquid outlet pipe 16 of the lower mold 7. A flow channel 32 is provided on the plug 26. In the initial position, the flow channel 32 is connected to the first branch pipe 17. The coolant returning from the main cooling channel flows into the secondary cooling channel 12 through the first branch pipe 17 to focus on cooling the heat dissipation fins 5. As the mold temperature changes during the die casting process, the temperature sensing and adjustment component installed on the outer wall of the lower mold 7 starts to work. The temperature sensing and adjustment component includes a rotating wheel 20 rotatably installed on the side wall of the lower mold 7. A connecting rod 21 rotatably installed on the outer end face of the rotating wheel 20 is hinged to a sliding rod 22 slidably installed on the bottom wall of the main liquid outlet pipe 16. When the mold temperature changes, the shape memory metal sheet 30 installed inside the mounting shell 25 on the outer wall of the auxiliary liquid outlet pipe 19 deforms due to the temperature change. The short rack 31 connected to the shape memory metal sheet 30 meshes with the third gear 28 rotatably mounted inside the mounting shell 25. The third gear 28 rotates together with the second gear 27 coaxially mounted. The second gear 27 meshes with the long rack 24 slidably mounted on the front end face of the lower mold 7. The long rack 24 meshes with the first gear 23 coaxially mounted with the rotating wheel 20. Through this series of transmissions, when the temperature changes, the deformation of the shape memory metal sheet 30 drives the rotating wheel 20 to rotate. Wheel 20 pushes slide rod 22 through connecting rod 21, which in turn drives slide plug 26 to slide in main outlet pipe 16. When slide plug 26 slides down to the second position, the outer wall of slide plug 26 blocks the first branch pipe 17, and the flow channel 32 is connected to the second branch pipe 18. At this time, the flow direction of coolant changes, and the cooling focus can be adjusted according to the actual cooling situation of the casting. Through the coordinated work of this temperature sensing adjustment component and slide plug 26, the flow rate and direction of coolant can be flexibly adjusted according to the real-time changes in mold temperature during die casting, further ensuring the adaptability of the cooling system and optimizing the cooling effect of the heat dissipation fin 5 area, and improving the quality of casting.

[0083] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A smart die-casting production method for street lamp die-casting parts, comprising the following steps: S1. Mold preparation: Install the designed die-casting mold onto the die-casting machine and preheat the mold to 180-220℃; The die-casting mold includes an upper mold (6) and a lower mold (7) that cooperate with each other. The upper mold is provided with a protruding structure (9) that matches the shape of the bottom opening of the lamp housing body (1). The lower mold is provided with a groove structure (10) that corresponds to the shape of the top of the lamp housing body and the heat dissipation fins (5). The upper and lower molds are provided with main cooling channels (11) around the protruding and groove structures. Both the upper mold and the lower mold are provided with a liquid injection port (14) and a first liquid outlet (15) that are connected to the main cooling channel. The first liquid outlet of the lower mold is connected to the main liquid outlet pipe (16), and the lower mold is provided with a secondary cooling channel (12) around the heat dissipation fins in the groove structure. The lower mold is also provided with a second liquid outlet (13) with one end connected to the auxiliary cooling channel and the other end connected to the auxiliary liquid outlet pipe (19). The main outlet pipe is connected to a first branch pipe (17) and a second branch pipe (18) on its side wall. The end of the first branch pipe away from the main outlet pipe is connected to the auxiliary cooling channel, and the end of the second branch pipe away from the main outlet pipe is connected to the auxiliary outlet pipe. A sliding plug (26) is slidably installed inside the main outlet pipe. A flow channel (32) is opened on the sliding plug. When the sliding plug is in its initial position, the flow channel is connected to the first branch pipe. When the sliding plug slides down to the second position, the outer wall of the sliding plug blocks the first branch pipe, and the flow channel is connected to the second branch pipe. S2. Raw material preparation: Heat the aluminum alloy raw material to 680-720℃ to completely melt it, and then degas and refine it to remove impurities and bubbles. S3. Die casting: The molten aluminum alloy raw material is injected into the pressure chamber of the die casting machine through the feeding equipment. The die casting machine is started and the aluminum alloy liquid is pressed into the mold cavity at high speed with a pressure of 50-80MPa. The holding time is 3-5s. S4. Intelligent monitoring and adjustment: During the die casting process, temperature and pressure data are collected in real time by temperature sensors and pressure sensors installed in the mold cavity, pressure chamber and key parts of the die casting machine, and transmitted to the control system. When the temperature or pressure data deviates from the preset range, the control system automatically adjusts the heating power, injection speed and pressure of the die casting machine to ensure the stability of the die casting process. S5. Demolding: After die casting is completed, coolant is injected into the mold cooling channel through a liquid pump to cool the mold to 80-120℃. The demolding device is then activated, and the formed street lamp die casting is ejected from the mold through ejector pins. S6. Post-processing: After demolding, the street light die-cast parts are deburred and polished, and airtightness and appearance quality are tested. Qualified products are packaged and put into storage.

2. The intelligent die-casting production method as described in claim 1, characterized in that: The temperature sensors are K-type thermocouples, which are installed on the top, bottom and side walls of the mold cavity, as well as the inlet and outlet of the pressure chamber. The pressure sensor is a strain gauge type pressure sensor, which is installed on the injection cylinder and the pressure holding cylinder of the die casting machine; When the temperature data deviates from the preset range of ±5℃, adjust the heating power by 5-10kW; when the pressure data deviates from the preset range of ±3MPa, adjust the injection speed by 0.1-0.3m / s and the pressure by 2-5MPa. In step S6, deburring is performed by vibration grinding for 10-15 minutes, and the grinding medium is alumina particles. In step S6, the airtightness test is performed using a helium leak detector, with a test pressure of 0.5-0.8 MPa and a pressure holding time of 2-3 minutes.

3. The intelligent die-casting production method as described in claim 1, characterized in that: In step S1, the upper mold (6) is provided with a filling port (8) for injecting aluminum alloy liquid into the groove structure (10).

4. The intelligent die-casting production method as described in claim 1, characterized in that: The outer wall of the lower mold (7) is provided with a temperature-sensitive adjustment component for adjusting the vertical sliding of the slide plug (26) to block / open the first diversion pipe (17) and the second diversion pipe (18).

5. The intelligent die-casting production method as described in claim 4, characterized in that: The temperature sensing adjustment component includes a rotating wheel (20) rotatably mounted on the side wall of the lower mold (7), a connecting rod (21) rotatably mounted on the outer end face of the rotating wheel (20), and a sliding rod (22) slidably mounted on the bottom wall of the main liquid outlet pipe (16). The end of the connecting rod (21) away from the rotating wheel (20) is hinged to the sliding rod (22).

6. The intelligent die-casting production method as described in claim 5, characterized in that: The temperature sensing adjustment component also includes a first gear (23) coaxially mounted with the rotating wheel (20) and a long rack (24) slidably disposed on the front end face of the lower mold (7). The long rack (24) meshes with the first gear (23). An installation shell (25) is installed on the outer wall of the auxiliary liquid outlet pipe (19). A second gear (27) meshing with the long rack (24) is rotatably mounted inside the installation shell (25). A third gear (28) is coaxially mounted on the second gear (27). An extension tube (29) extending radially is provided on the side wall of the auxiliary liquid outlet pipe (19). A shape memory metal sheet (30) is installed inside the extension tube (29). A short rack (31) is connected to the shape memory metal sheet (30). The short rack (31) meshes with the third gear (28).

7. The intelligent die-casting production method as described in claim 6, characterized in that: The mounting housing (25) has a sliding opening on its side wall, and the long rack (24) is slidably connected inside the sliding opening.

8. The intelligent die-casting production method as described in claim 1, characterized in that: The first diversion pipe (17) is located on the upper side wall of the main outlet pipe (16), the second diversion pipe (18) is located on the lower side wall of the main outlet pipe (16), and the first diversion pipe (17) is located above the second diversion pipe (18).

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