Street lamp die casting and intelligent die casting production method thereof

Abstract

The invention 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 main body, the lamp shell main body is of a structure with a closed top surface and an open bottom end, and the lamp shell main body is internally provided with a first mounting cavity for mounting a lamp and a second mounting cavity for mounting an electric appliance element; a mounting portion used for being connected with a lamp pole is arranged on the side wall of the lamp shell body, a plurality of radiating fins protruding outwards are arranged on the top face of the lamp shell body, and the lamp shell body, the first mounting cavity, the second mounting cavity, the mounting portion and the radiating fins are integrally formed in a die-casting mode. In order to solve the problem that the heat dissipation fins are prone to being overcooled, the special cooling channel and the sliding plug control structure are designed, the temperature sensing adjusting assembly is combined, the cooling strategy can be flexibly adjusted according to the actual cooling requirements of heat dissipation fin areas in different die casting stages, the overcooling problem caused by overall cooling of the heat dissipation fins is effectively solved, and the service life of the heat dissipation fins is prolonged. The casting quality is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of street lamp production, and in particular to a street lamp die-casting part and an intelligent die-casting production method thereof. Background Art

[0002] Street lamps play a vital role in modern urban lighting systems. As a key component to protect the internal light source, electrical components and achieve good heat dissipation, the quality and performance of street lamp housings directly affect the overall service life and lighting effect of street lamps. Die casting technology is widely used in the production of street lamp housings due to its advantages of high efficiency, high precision and the ability to manufacture parts with complex shapes.

[0003] At present, common lamp housing die-casting molds generally adopt the overall cooling method. Although this cooling strategy can achieve solidification of castings to a certain extent, it has obvious limitations. Taking the common heat sink fins on street lamp housings as an example, the heat sink fins are usually integrally formed on the lamp housing, and their structure is thinner and lighter than other parts of the lamp housing. During the overall cooling process, due to the large surface area to volume ratio of the heat sink fins, the heat dissipation rate is much faster than the main part of the lamp housing, which can easily lead to overcooling of the heat sink fins.

[0004] Excessive cooling brings many negative effects to the quality of the lamp housing. On the one hand, inside the casting, excessive cooling causes the molten metal at the heat sink fins to solidify quickly, which does not blend well with the subsequent molten metal, and then produces cold shut defects. The cold shut not only seriously affects the appearance quality of the lamp housing, but also forms stress concentration points at the cold shut locations, reducing the structural strength of the lamp housing. During the use of street lamps, when subjected to external forces such as wind and vibration, the cold shut locations are very likely to cause crack expansion, eventually causing the lamp housing to rupture, seriously affecting the safety and service life of the street lamps. On the other hand, excessive cooling causes abnormal changes in the metal structure of the heat sink fin area, uneven grain refinement, and segregation, which not only reduces the mechanical properties of the material, but also significantly reduces the corrosion resistance of the area. In complex outdoor environments, the heat sink fins are more susceptible to erosion by rain, salt, etc., shortening the overall service life of the lamp housing.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The object of the present invention is to provide a street lamp die-casting and an intelligent die-casting production method thereof to solve the problems raised in the above background technology.

[0007] To solve the above technical problems, a street lamp die-casting part provided by the present invention includes a lamp housing main body. The lamp housing main body has a structure with a closed top surface and an open bottom end. Inside the lamp housing main body, there is a first installation cavity for installing lamps and a second installation cavity for installing electrical components. An installation part for connecting with a lamp post is provided on the side wall of the lamp housing main body. A plurality of outwardly protruding heat dissipation fins are provided on the top surface of the lamp housing main body. The lamp housing main body, the first installation cavity, the second installation cavity, the installation part, and the heat dissipation fins are integrally die-cast.

[0008] Further, the lamp housing main body is made of aluminum alloy material. The aluminum element content in the aluminum alloy is 90%, and it contains 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 and the distance between adjacent heat dissipation fins is 5 mm - 10 mm.

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

[0011] An intelligent die-casting production method includes the following steps:

[0012] S1. Mold preparation step: Install the designed die-casting mold on the die-casting machine and preheat the mold to 180 - 220 °C.

[0013] S2. Raw material preparation step: Heat the aluminum alloy raw material to 680 - 720 °C to completely melt it, and perform degassing and refining treatment to remove impurities and bubbles.

[0014] S3. Die-casting step: Inject the melted aluminum alloy raw material into the pressure chamber of the die-casting machine through a feeding device, start the die-casting machine, and press the aluminum alloy liquid into the mold cavity at a high speed with a pressure of 50 - 80 MPa, and the holding pressure time is 3 - 5 s.

[0015] S4. Intelligent monitoring and adjustment step: During the die-casting process, collect temperature and pressure data in real time through temperature sensors and pressure sensors installed at key parts of the mold cavity, pressure chamber, and die-casting machine, and transmit them 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, inject coolant into the mold cooling channels through a liquid pump to cool the mold to 80 - 120 °C, start the demolding device, and eject the formed street lamp die-casting part from the mold through ejector pins.

[0017] S6. Post - processing steps: Deburr and polish the die - cast parts of the street lamp after demolding, and conduct airtightness detection and appearance quality inspection. Qualified products are packaged and stored in the warehouse.

[0018] Further, the temperature sensors are K - type thermocouples, which are respectively installed at the top, bottom and side walls of the mold cavity, as well as the inlet and outlet of the pressure chamber.

[0019] The pressure sensors are strain - gauge pressure sensors, which are installed on the injection cylinder and the holding - pressure cylinder of the die - casting machine.

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

[0021] In step S6, deburring is carried out by vibration grinding. The grinding time is 10 - 15 min, and the grinding medium is alumina particles.

[0022] In step S6, airtightness detection is carried out using a helium leak detector. The detection pressure is 0.5 - 0.8 MPa, the holding - pressure time is 2 - 3 min, and a leakage rate not exceeding 5×10 - 6 Pa·m3 / s is considered qualified.

[0023] Further, in step S1, the die - casting mold includes a upper mold and a lower mold that cooperate with each other. The upper mold is provided with a convex structure adapted to the shape of the bottom opening of the lamp housing body, and the lower mold is provided with a groove structure corresponding to the shape of the top of the lamp housing body and the heat - dissipation fins. The upper mold is provided with a pouring port for injecting aluminum alloy liquid into the groove structure. Main cooling channels are arranged inside both the upper mold and the lower mold around the convex structure and the groove structure, and liquid injection ports and first liquid outlet ports communicating with the main cooling channels are arranged on both the upper mold and the lower mold.

[0024] Further, a main liquid outlet pipe is connected to the first liquid outlet on the lower mold. A secondary cooling channel is provided inside the lower mold around the position of the heat dissipation fins in the groove structure. A second liquid outlet is also provided on the lower mold. One end of the second liquid outlet is communicated with the secondary cooling channel, and the other end is connected to a secondary liquid outlet pipe. A first shunt pipe and a second shunt pipe are connected to the side wall of the main liquid outlet pipe. The end of the first shunt pipe far from the main liquid outlet pipe is communicated with the secondary cooling channel, and the end of the second shunt pipe far from the main liquid outlet pipe is communicated with the secondary 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 the initial position, the flow channel is communicated with the first shunt pipe. When the sliding plug slides down to the second position, the outer wall of the sliding plug blocks the first shunt pipe, and the flow channel is communicated with the second shunt pipe. A temperature-sensitive 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 shunt pipe and the second shunt pipe.

[0025] Further, the temperature-sensitive adjustment component includes a rotating wheel rotatably installed on the side wall of the lower mold. A connecting rod is rotatably installed on the outer end surface of the rotating wheel. A sliding rod is slidably installed on the bottom wall of the main liquid outlet pipe. One end of the connecting rod far from the rotating wheel is hinged to the sliding rod.

[0026] Further, the temperature-sensitive adjustment component further includes a first gear coaxially installed with the rotating wheel and a long rack slidably arranged on the front end surface of the lower mold. The long rack is meshed with the first gear. An installation shell is installed on the outer wall of the secondary liquid outlet pipe. A second gear meshed with the long rack is rotatably installed inside the installation shell. A third gear is coaxially installed on the second gear. An extension pipe extending along the radial direction of the secondary liquid outlet pipe is provided on the side wall of the secondary liquid outlet pipe. A shape memory metal sheet is installed inside the extension pipe. A short rack is connected to the shape memory metal sheet. The short rack is meshed with the third gear.

[0027] Further, a sliding opening is opened on the side wall of the installation shell. The long rack is slidably connected inside the sliding opening.

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

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

[0030] 1. In order to solve the problem that the heat sink fins are prone to overcooling, the present invention innovatively designs a heat dissipation method that utilizes the reflow of coolant in the main cooling channel. The coolant with a certain temperature after heat exchange in the main cooling channel is transported to the auxiliary cooling channel arranged around the heat sink fins. This cooling strategy with different temperature differences has multiple advantages. In the early stage of die-casting, the heat sink fins are in contact with high-temperature molten metal and have a large heat dissipation demand. At this time, the relatively low-temperature main cooling channel refluxes coolant into the secondary cooling channel, which can quickly take away a large amount of heat and effectively suppress the heating rate of the heat sink fins. As the die-casting process progresses, the overall temperature of the mold drops, and the temperature of the heat sink fins also gradually decreases. At this time, coolant with a certain temperature continues to flow in, avoiding quality defects of the heat sink fins due to excessive cooling. Compared with traditional single-temperature cooling media, this staged and adaptive cooling method can more accurately match the heat dissipation requirements of the heat sink fins at different die-casting stages, optimize the heat dissipation effect, and significantly improve the quality of castings. Combined with a special sliding plug control structure and temperature sensing adjustment components, the coolant flow and direction can be flexibly adjusted according to the actual temperature conditions, further ensuring the adaptability of the cooling system and the optimization of the cooling effect in the heat sink fin area.

[0031] 2. In view of the problem that the heat sink fins are prone to overcooling, the present invention designs a special cooling channel and sliding plug control structure. Combined with the 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, effectively improve the overcooling problem of the heat sink fins caused by overall cooling, and significantly improve the quality of castings. The temperature sensing adjustment component with simple structure and reliable operation, as well as the reasonable position layout of the shunt pipe, further ensure the adaptability of the cooling system and the optimization of the cooling effect of the heat sink fin area. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the top view of the die-casting of the street lamp in the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the die-casting of the street lamp in the present invention when viewed from above;

[0034] Figure 3 It is a structural schematic diagram of the die-casting mold in the present invention;

[0035] Figure 4 It is a schematic diagram of the cross-sectional structure of the die-casting mold in the present invention;

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

[0037] Figure 6 For along Figure 5 Schematic diagram of the cross-section structure along the middle section line AA;

[0038] Figure 7It is a front view structural schematic diagram of the temperature-sensitive adjustment component in the die-casting mold;

[0039] Figure 8 It is a rear view structural schematic diagram of the temperature-sensitive adjustment component in the die-casting mold;

[0040] Figure 9 It is a cross-sectional structural schematic diagram of the main liquid outlet pipe in the present invention.

[0041] In the figure: 1. Lamp housing main body; 2. First installation cavity; 3. Second installation cavity; 4. Installation 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. Sub-cooling channel; 13. Second liquid outlet; 14. Liquid injection port; 15. First liquid outlet; 16. Main liquid outlet pipe; 17. First shunt pipe; 18. Second shunt pipe; 19. Sub-liquid outlet pipe; 20. Rotating wheel; 21. Connecting rod; 22. Slide bar; 23. First gear; 24. Long rack; 25. Installation shell; 26. Slide plug; 27. Second gear; 28. Third gear; 29. Extension pipe; 30. Shape memory metal sheet; 31. Short rack; 32. Flow channel. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0043] Please refer to Figures 1-9 , the present invention provides a technical solution: A street lamp die-casting part includes a lamp housing main body 1. The lamp housing main body 1 has a structure with a closed top surface and an open bottom end. Inside the lamp housing main body 1, there is a first installation cavity 2 for installing lamps and a second installation cavity 3 for installing electrical components. On the side wall of the lamp housing main body 1, there is an installation part 4 for connecting with the lamp post. On the top surface of the lamp housing main body 1, there are a plurality of outwardly protruding heat dissipation fins 5. The lamp housing main body 1, the first installation cavity 2, the second installation cavity 3, the installation 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. The excellent heat dissipation performance extends the service life of internal components. The reasonable size of the heat dissipation fins 5 optimizes the heat dissipation effect. The precise depth of the installation cavity facilitates the installation of lamps and electrical components, improving the assembly accuracy.

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

[0046] The height of the heat dissipation fin 5 is that of the side wall of the lamp housing main body 1, and the distance between adjacent heat dissipation fins 5 is 5 mm - 10 mm;

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

[0048] Specifically,

[0049] An intelligent die-casting production method includes the following steps:

[0050] S1. Mold preparation step: Install the designed die-casting mold on the die-casting machine and preheat the mold to 180 - 220 °C;

[0051] S2. Raw material preparation step: Heat the aluminum alloy raw material to 680 - 720 °C to completely melt it, and perform degassing and refining treatment to remove impurities and bubbles;

[0052] S3. Die-casting step: Inject the melted aluminum alloy raw material into the pressure chamber of the die-casting machine through the feeding device, start the die-casting machine, and press the aluminum alloy liquid into the mold cavity at a high speed with a pressure of 50 - 80 MPa, and the holding pressure time is 3 - 5 s;

[0053] S4. Intelligent monitoring and adjustment step: During the die-casting process, collect temperature and pressure data in real time through temperature sensors and pressure sensors installed at key parts of the mold cavity, pressure chamber and die-casting machine, and transmit them 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. Demoulding step: After die-casting is completed, inject the coolant into the mold cooling channel through the liquid pump to cool the mold to 80 - 120 °C, start the demoulding device, and eject the formed street lamp die-casting from the mold through the ejector pin;

[0055] S6. Post-treatment step: Deburr and polish the street lamp die-casting after demoulding, and perform airtightness detection and appearance quality detection. Qualified products are packaged and stored in the warehouse.

[0056] Specifically, all steps of the entire intelligent die-casting production method are closely coordinated. From the precise control of the mold, raw materials to the die-casting process, to intelligent monitoring and adjustment, demoulding and post-treatment, it ensures the high-quality production of street lamp die-castings, reduces the scrap rate, improves the production efficiency, and the product quality is stable and reliable.

[0057] The temperature sensor is a K-type thermocouple, which is respectively installed at the top, bottom and side wall of the mold cavity, and at the inlet and outlet of the pressure chamber;

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

[0059] When the temperature data deviates from the preset range of ±5°C, the amplitude of adjusting the heating power is 5 - 10 kW; when the pressure data deviates from the preset range of ±3 MPa, the amplitude of adjusting the injection speed is 0.1 - 0.3 m / s, and the amplitude of adjusting the pressure is 2 - 5 MPa;

[0060] In step S6, deburring is carried out by vibration grinding. The grinding time is 10 - 15 min, and the grinding medium is alumina particles;

[0061] In step S6, the airtightness detection is carried out by a helium leak detector. The detection pressure is 0.5 - 0.8 MPa, the pressure holding time is 2 - 3 min, and the leakage rate not exceeding 5×10 -6 Pa·m 3 / s is regarded as qualified.

[0062] Specifically, the precise sensor selection and installation position ensure that temperature and pressure data can be comprehensively and accurately collected, providing a reliable basis for the control system to achieve precise adjustment of the die-casting process. Appropriate deburring and detection methods ensure the surface quality and airtightness of the castings, improving the overall quality of the products.

[0063] Refer to Figures 3-9 , in step S1, the die-casting mold includes a mutually cooperating upper mold 6 and a lower mold 7. The upper mold 6 is provided with a convex structure 9 adapted to the shape of the bottom opening of the lamp housing main body 1. The lower mold 7 is provided with a groove structure 10 corresponding to the shape of the top of the lamp housing main body 1 and the heat dissipation fins 5. The upper mold 6 is provided with a pouring port 8 for injecting aluminum alloy liquid into the inside of the groove structure 10. Main cooling channels 11 are provided inside both the upper mold 6 and the lower mold 7 around the convex structure 9 and the groove structure 10. Liquid injection ports 14 and first liquid discharge ports 15 communicating with the main cooling channels 11 are provided on both the upper mold 6 and the lower mold 7.

[0064] Specifically, the pouring port 8 of the upper mold 6 is used to inject aluminum alloy liquid. Main cooling channels 11 are provided inside the upper mold 6 and the lower mold 7 around the convex and groove structures. The coolant circulation is realized through the liquid injection ports 14 and the first liquid discharge ports 15 to initially cool the whole mold. This mold structure design is highly adapted to the shape of the lamp housing die-casting part, ensuring the accuracy of die-casting forming. The setting of the main cooling channels 11 can initially cool the mold, enabling the casting to solidify and form in a suitable temperature environment and improving the quality of the casting.

[0065] Refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 9, a main liquid outlet pipe 16 is connected to the first liquid outlet 15 on the lower die 7. A secondary cooling channel 12 is provided inside the lower die 7 around the position of the heat dissipation fins 5 in the groove structure 10. A second liquid outlet 13 is also provided on the lower die 7. One end of the second liquid outlet 13 is communicated with the secondary cooling channel 12, and the other end is connected to a secondary liquid outlet pipe 19. A first shunt pipe 17 and a second shunt pipe 18 are connected to the side wall of the main liquid outlet pipe 16. One end of the first shunt pipe 17 away from the main liquid outlet pipe 16 is communicated with the secondary cooling channel 12, and one end of the second shunt pipe 18 away from the main liquid outlet pipe 16 is communicated with the secondary liquid outlet pipe 19. A sliding plug 26 is slidably installed inside the main liquid outlet pipe 16. A flow channel 32 is provided on the sliding plug 26. When the sliding plug 26 is in the initial position, the flow channel 32 is communicated with the first shunt pipe 17. When the sliding plug 26 slides down to the second position, the outer wall of the sliding plug 26 blocks the first shunt pipe 17, and the flow channel 32 is communicated with the second shunt pipe 18. A temperature-sensitive adjustment assembly for adjusting the vertical sliding of the sliding plug 26 to block / open the first shunt pipe 17 and the second shunt pipe 18 is provided on the outer wall of the lower die 7.

[0066] Specifically, the sliding plug 26 inside the main liquid outlet pipe 16 is slidable. Initially, the flow channel 32 on the sliding plug 26 is communicated with the first shunt pipe 17, and the coolant preferentially flows into the secondary cooling channel 12 to cool the heat dissipation fins 5 area intensively; when the sliding plug 26 slides down to the second position, the flow channel 32 is communicated with the second shunt pipe 18, and the coolant flows to the secondary liquid outlet pipe 19. At this time, the cooling focus can be adjusted according to the cooling situation of the casting. The temperature-sensitive adjustment assembly on the outer wall of the lower die 7 can adjust the sliding of the sliding plug 26 according to the temperature change;

[0067] Through the design of this cooling channel and the sliding plug 26, targeted cooling of the heat dissipation fins 5 area is realized. In the initial stage of die casting, the heat dissipation fins 5 are cooled intensively to avoid overcooling due to excessive heat dissipation; as the die casting process progresses, the cooling strategy can be flexibly adjusted according to the actual temperature situation, effectively improving the problem of overcooling of the heat dissipation fins 5 caused by overall cooling and improving the quality of the casting.

[0068] Refer to Figure 3 、 Figure 5 、 Figure 7 and Figure 8 , the temperature-sensitive adjustment assembly includes a rotating wheel 20 rotatably installed on the side wall of the lower die 7. A connecting rod 21 is rotatably installed on the outer end face of the rotating wheel 20. A sliding rod 22 is slidably installed on the bottom wall of the main liquid outlet pipe 16. One 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, the connecting rod 21 drives the sliding rod 22 to slide, thereby pushing the sliding plug 26 to slide within the main liquid outlet pipe 16, achieving the control of blocking or opening the first shunt pipe 17 and the second shunt pipe 18; this temperature-sensitive adjustment component with mechanical connection has a simple structure and reliable operation, can flexibly control the position of the sliding plug 26 according to temperature changes, effectively adjust the cooling method in the area of the heat dissipation fins 5, and improve the adaptability of the cooling system.

[0070] Referring to Figure 3 , Figure 5 , Figure 7 and Figure 8 , the temperature-sensitive adjustment component further includes a first gear 23 coaxially installed with the rotating wheel 20 and a long rack 24 slidably arranged 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 meshed with the long rack 24 is rotatably installed inside the installation shell 25. A third gear 28 is coaxially installed on the second gear 27. An extension pipe 29 extending radially along the side wall of the auxiliary liquid outlet pipe 19 is provided on the side wall of the auxiliary liquid outlet pipe 19. A shape memory metal sheet 30 is installed inside the extension pipe 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 pipe 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 is meshed with the third gear 28. When the temperature changes, the shape memory metal sheet 30 deforms. 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, the rotating wheel 20 is driven to rotate, ultimately realizing the adjustment of the position of the sliding plug 26; by utilizing the temperature-sensitive characteristic of the shape memory metal sheet 30, a cooling adjustment system that automatically responds to temperature changes is constructed. Without an additional complex control system, the cooling strategy can be automatically adjusted according to the temperature in the area of the heat dissipation fins 5 during the die-casting process, improving the intelligence and reliability of the cooling system.

[0072] Referring to Figure 8 , a sliding port is opened on the side wall of the installation shell 25. The long rack 24 is slidably connected inside the sliding port.

[0073] Specifically, during the meshing transmission process of the long rack 24 with the first gear 23 and the second gear 27, it is guided through the sliding port to ensure the smooth movement of the long rack 24, thereby ensuring the stability of the transmission of the entire temperature-sensitive adjustment component;

[0074] The design of the sliding port provides a stable sliding track for the long rack 24, ensuring the accuracy and reliability of the transmission between the components of the temperature-sensitive adjustment component, and avoiding affecting the adjustment accuracy of the position of the sliding plug 26 due to problems such as the shaking of the long rack 24.

[0075] Refer to Figure 9 Figure 9 , the first shunt pipe 17 is located on the side wall of the upper part of the main liquid outlet pipe 16, the second shunt pipe 18 is located on the side wall of the lower part of the main liquid outlet pipe 16, and the first shunt pipe 17 is above the second shunt pipe 18.

[0076] Specifically, in the initial stage of die-casting, the mold temperature is relatively high, and the heat dissipation demand in the area of the heat dissipation fins 5 is large. The coolant preferentially flows from the main liquid outlet pipe 16 through the first shunt pipe 17 into the auxiliary cooling channel 12 to cool the heat dissipation fins 5 key points. As the die-casting progresses, the overall temperature of the mold decreases, and the temperature in the area of the heat dissipation fins 5 is relatively stable. The sliding plug 26 slides down, and the coolant flows into the auxiliary liquid outlet pipe 19 through the second shunt pipe 18, which can cool other parts or make fine adjustments to the overall cooling.

[0077] This layout design of the shunt pipe position, combined with the sliding control of the sliding plug 26, can reasonably distribute the flow direction of the coolant according to the actual cooling demand of the heat dissipation fins 5 area in different stages of die-casting, further optimize the cooling effect on the heat dissipation fins 5 area, and improve the quality of the casting.

[0078] Working principle: The lamp housing main body 1 is constructed into a structure with a closed top surface and an open bottom end. The first installation cavity 2 and the second installation cavity 3 are accurately divided inside for the installation of lamps and electrical components respectively, ensuring that the installation positions of each component are clear and do not interfere with each other. The installation part 4 is provided on the side wall of the lamp housing main body 1 for stable connection with the lamp post, ensuring the installation stability of the entire street lamp. The heat dissipation fins 5 protruding outward are added on the top surface of the lamp housing main body 1, and their large surface area is used to increase the heat dissipation area and promote heat dissipation. Moreover, through the integral die-casting forming process, the lamp housing main body 1, the first installation cavity 2, the second installation cavity 3, the installation part 4, and the heat dissipation fins 5 become a closely connected whole, ensuring the connection strength and sealing performance between each part, optimizing the heat conduction path at the same time, and improving the heat dissipation efficiency.

[0079] Before die-casting, the die-casting mold, that is, the upper mold 6 and the lower mold 7 that cooperate with each other, is accurately installed on the die-casting machine, and the upper mold 6 and the lower mold 7 are preheated to make their temperature reach 180 - 220 °C. 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 process of filling the mold cavity, ensure that the aluminum alloy liquid can smoothly fill each part 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 °C to make it completely melted, and then degassing and refining treatments are 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] Through the feeding equipment, the melted and processed aluminum alloy raw materials are accurately injected into the shot chamber of the die-casting machine. After starting the die-casting machine, the die-casting machine injects the aluminum alloy liquid into the mold cavity at a high pressure of 50 - 80 MPa at a high speed. After the filling is completed, the holding pressure time is maintained for 3 - 5 s. During this process, the high pressure can make the aluminum alloy liquid tightly fill 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 aluminum alloy liquid, reduce defects such as shrinkage cavities and porosity inside the casting, and improve the density and overall strength of the casting. During the entire die-casting process, K-type thermocouple temperature sensors installed at the top, bottom, and side walls of the mold cavity, as well as the inlet and outlet of the shot chamber, collect temperature data in real time; strain gauge pressure sensors installed on the injection cylinder and holding pressure 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, ensure that the die-casting process is always in a stable state, and ensure the consistency and stability of the casting quality;

[0081] After die casting is completed, to enable the casting to be smoothly demolded and ensure its quality, a coolant is injected into the main cooling channels 11 provided inside the mold around the convex structure 9 and the groove structure 10, and the secondary cooling channels 12 around the heat dissipation fins 5 of the lower mold 7 through a liquid pump. The coolant circulates in these channels, absorbing the heat of the mold, thereby reducing the mold temperature. When the mold cools to 80 - 120 °C, at this time the casting has basically solidified and formed. The demolding device is started, and the formed street lamp die casting is ejected from the mold using ejector pins. During the cooling process, the coolant in the main cooling channels 11 first exchanges heat with the entire mold, absorbing a large amount of heat and increasing in temperature. Subsequently, the coolant with a certain temperature after heat exchange in the main cooling channels 11 is transported to the secondary cooling channels 12 for cooling the heat dissipation fins 5. In the initial stage of die casting, the heat dissipation fins 5 come into contact with the high-temperature aluminum alloy liquid, and the temperature rises rapidly. At this time, the relatively low-temperature coolant flowing back from the main cooling channels 11 enters the secondary cooling channels 12, which can quickly carry away a large amount of heat, effectively suppressing the heating rate of the heat dissipation fins 5 and 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 dissipation fins 5 also decreases accordingly. At this time, the coolant with a certain temperature continues to flow into the secondary cooling channels, providing a mild cooling environment for the heat dissipation fins 5 and avoiding quality defects such as cold shuts and cracks caused by excessive cooling of the heat dissipation fins 5. This method of using coolants with different temperatures to conduct staged and adaptive cooling of the heat dissipation fins 5 according to different stages of die casting can better meet the heat dissipation requirements of the heat dissipation fins 5 during the entire die casting process, optimize the heat dissipation effect, and improve the quality of the casting;

[0082] In order to further optimize the cooling effect on the heat dissipation fins 5, a slidable plug 26 is arranged inside the main liquid outlet pipe 16 of the lower die 7. A flow channel 32 is provided on the plug 26. In the initial position, the flow channel 32 is communicated with the first shunt pipe 17. The coolant flowing back through the main cooling channel preferentially flows into the secondary cooling channel 12 through the first shunt pipe 17 to conduct key cooling on the heat dissipation fins 5. As the temperature of the die changes during the die-casting process, the temperature-sensitive adjustment component installed on the outer wall of the lower die 7 starts to work. The temperature-sensitive adjustment component includes a rotating wheel 20 rotatably installed on the side wall of the lower die 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 die temperature changes, a shape memory metal sheet 30 installed in the mounting shell 25 on the outer wall of the secondary liquid outlet pipe 19 will deform due to the temperature change. A short rack 31 connected to the shape memory metal sheet 30 meshes with a third gear 28 rotatably installed in the mounting shell 25. The third gear 28 and a coaxial second gear 27 rotate together. The second gear 27 meshes with a long rack 24 slidably arranged on the front end face of the lower die 7. The long rack 24 also meshes with a first gear 23 coaxially installed 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. The rotating wheel 20 pushes the sliding rod 22 to slide through the connecting rod 21, thereby driving the plug 26 to slide in the main liquid outlet pipe 16. When the plug 26 slides down to the second position, the outer wall of the plug 26 blocks the first shunt pipe 17, and the flow channel 32 is communicated with the second shunt pipe 18. At this time, the flow direction of the coolant changes, and the cooling focus can be adjusted according to the actual cooling situation of the casting. Through the collaborative work of this temperature-sensitive adjustment component and the plug 26, the flow rate and flow direction of the coolant can be flexibly adjusted according to the real-time change of the die temperature during the die-casting process, further ensuring the adaptability of the cooling system and optimizing the cooling effect on the area of the heat dissipation fins 5, and improving the quality of the casting.

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

Claims

1. A street lamp die-cast part, comprising a lamp housing main body (1), the lamp housing main body (1) having a structure with a closed top surface and an open bottom end, characterized in that: The interior of the lamp housing main body (1) has a first installation cavity (2) for installing lamps and a second installation cavity (3) for installing electrical components. An installation part (4) for connecting with a lamp post is arranged on the side wall of the lamp housing main body (1). A plurality of outwardly protruding heat dissipation fins (5) are arranged on the top surface of the lamp housing main body (1). The lamp housing main body (1), the first installation cavity (2), the second installation cavity (3), the installation part (4) and the heat dissipation fins (5) are integrally die-cast.

2. The die-casting part of a street lamp according to claim 1, wherein: The lamp housing main body (1) is made of aluminum alloy material. The aluminum element content in the aluminum alloy is 90%, and it contains 4% magnesium and 6% silicon to enhance the strength and heat dissipation performance of the material. The height of the heat dissipation fin (5) is and the distance between adjacent heat dissipation fins is 5 mm - 10 mm; The depth of the first installation cavity (2) is 3 mm - 5 mm, and the depth of the second installation cavity (3) is 5 mm - 8 mm.

3. An intelligent die-casting production method for the street lamp die-casting part according to any one of claims 1-2, characterized in that, It includes the following steps: S1. Mold preparation step: Install the designed die-casting mold on the die-casting machine and preheat the mold to 180 - 220 °C. S2. Raw material preparation step: Heat the aluminum alloy raw material to 680 - 720 °C to make it completely melt, and perform degassing and refining treatment to remove impurities and bubbles. S3. Die-casting step: Inject the melted aluminum alloy raw material into the shot chamber of the die-casting machine through the feeding device, start the die-casting machine, and press the aluminum alloy liquid into the mold cavity at a high speed with a pressure of 50 - 80 MPa. The holding pressure time is 3 - 5 s. S4. Intelligent monitoring and adjustment step: During the die-casting process, temperature and pressure data are collected in real time through temperature sensors and pressure sensors installed at key parts of the mold cavity, shot chamber and 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 step: After die-casting is completed, inject the coolant into the mold cooling channels through the liquid pump to cool the mold to 80 - 120 °C, start the demolding device, and eject the formed street lamp die-casting from the mold through the ejector pins. S6. Post-treatment step: Deburr and polish the demolded street lamp die-castings, and perform airtightness detection and appearance quality detection. The qualified products are packaged and stored in the warehouse.

4. The intelligent die-casting production method according to claim 3, characterized in that: The temperature sensor is a K-type thermocouple, which is respectively installed at the top, bottom and side wall of the mold cavity, and at the inlet and outlet of the shot chamber. The pressure sensor adopts a strain gauge type pressure sensor and is installed on the injection cylinder and holding pressure cylinder of the die-casting machine. When the temperature data deviates from the preset range by ±5 °C, the adjustment range of the heating power is 5 - 10 kW; when the pressure data deviates from the preset range by ±3 MPa, the adjustment range of the injection speed is 0.1 - 0.3 m / s, and the adjustment range of the pressure is 2 - 5 MPa. In step S6, deburring is carried out by vibration grinding. The grinding time is 10 - 15 min, and the grinding medium is alumina particles. In step S6, airtightness detection is carried out by a helium leak detector. The detection pressure is 0.5 - 0.8 MPa, the holding pressure time is 2 - 3 min, and the leakage rate not exceeding 5×10-6 Pa·m3 / s is regarded as qualified.

5. The intelligent die-casting production method according to claim 3, wherein: In step S1, the die-casting mold includes a matching upper mold (6) and a lower mold (7). The upper mold (6) is provided with a convex structure (9) adapted to the shape of the bottom opening of the lamp housing body (1). The lower mold (7) is provided with a groove structure (10) corresponding to the shape of the top of the lamp housing body (1) and the heat dissipation fins (5). A feeding port (8) for injecting aluminum alloy liquid into the groove structure (10) is arranged on the upper mold (6). Main cooling channels (11) surrounding the convex structure (9) and the groove structure (10) are arranged inside both the upper mold (6) and the lower mold (7). Liquid injection ports (14) and first liquid discharge ports (15) communicating with the main cooling channels (11) are arranged on both the upper mold (6) and the lower mold (7).

6. The intelligent die-casting production method according to claim 5, characterized in that: A main liquid discharge pipe (16) is connected to the first liquid discharge port (15) on the lower mold (7). A secondary cooling channel (12) surrounding the position of the heat dissipation fins (5) in the groove structure (10) is arranged inside the lower mold (7). A second liquid discharge port (13) is further arranged on the lower mold (7). One end of the second liquid discharge port (13) communicates with the secondary cooling channel (12), and the other end is connected to a secondary liquid discharge pipe (19). A first shunt pipe (17) and a second shunt pipe (18) are connected to the side wall of the main liquid discharge pipe (16). One end of the first shunt pipe (17) away from the main liquid discharge pipe (16) communicates with the secondary cooling channel (12), and one end of the second shunt pipe (18) away from the main liquid discharge pipe (16) communicates with the secondary liquid discharge pipe (19). A sliding plug (26) is slidably installed inside the main liquid discharge 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) communicates with the first shunt pipe (17). When the sliding plug (26) slides down to the second position, the outer wall of the sliding plug (26) blocks the first shunt pipe (17), and the flow channel (32) communicates with the second shunt pipe (18). A temperature-sensitive adjustment assembly for adjusting the vertical sliding of the sliding plug (26) to block / open the first shunt pipe (17) and the second shunt pipe (18) is arranged on the outer wall of the lower mold (7).

7. The intelligent die-casting production method according to claim 6, characterized in that: The temperature-sensitive adjustment assembly includes a rotating wheel (20) rotatably installed on the side wall of the lower mold (7). A connecting rod (21) is rotatably installed on the outer end face of the rotating wheel (20). A sliding rod (22) is slidably installed on the bottom wall of the main liquid discharge pipe (16). One end of the connecting rod (21) away from the rotating wheel (20) is hinged to the sliding rod (22).

8. The intelligent die-casting production method according to claim 7, characterized in that: The temperature sensing and adjusting assembly further includes a first gear (23) coaxially installed with the rotating wheel (20) and a long rack (24) slidably arranged on the front end face of the lower die (7). The long rack (24) is meshed and connected 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) meshed with the long rack (24) is rotatably installed inside the installation shell (25). A third gear (28) is coaxially installed on the second gear (27). An extension pipe (29) extending along the radial direction of the auxiliary liquid outlet pipe (19) is arranged on the side wall of the auxiliary liquid outlet pipe (19). A shape memory metal sheet (30) is installed inside the extension pipe (29). A short rack (31) is connected to the shape memory metal sheet (30). The short rack (31) is meshed and connected with the third gear (28).

9. The intelligent die-casting production method according to claim 8, characterized in that: A sliding opening is formed in the side wall of the installation shell (25). The long rack (24) is slidably connected inside the sliding opening.

10. The intelligent die-casting production method according to claim 7, characterized in that: The first shunt pipe (17) is located on the side wall of the upper part of the main liquid outlet pipe (16). The second shunt pipe (18) is located on the side wall of the lower part of the main liquid outlet pipe (16). The first shunt pipe (17) is above the second shunt pipe (18).

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