Injection mold for automobile radiator shroud

Abstract

The present application relates to injection mold technical field, specifically to a kind of automobile heat dissipation wind cover injection mold of gas-assisted injection molding.A kind of automobile heat dissipation wind cover injection mold, including movable die plate, fixed die plate, movable die seat plate, feed inlet and gas nozzle, the movable die plate is fixedly connected with movable die seat plate, the center of movable die seat plate is provided with feed inlet, movable die plate and fixed die plate form mold cavity between, feed inlet is communicated with mold cavity;The gas nozzle can blow gas into mold cavity, form an air inlet and two air outlets in mold cavity when blowing, first waste groove and second waste groove are set on movable die plate corresponding two air outlet positions;The gas nozzle includes gas nozzle body and gas valve, and the gas valve includes connecting column and plug cover.The mold is formed by optimizing gas auxiliary channel and gas nozzle structure, realizes the efficient forming of heat dissipation wind cover, reduces product shrinkage deformation, improves hollow structure forming quality and product appearance precision.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and specifically to an injection mold for an automotive radiator shroud formed by gas-assisted injection molding. Background Technology

[0002] Automotive water-cooling systems require a fan and a radiator shroud to achieve air cooling. These radiator shrouds are typically injection-molded plastic products. Traditional injection molding of radiator shrouds has the following drawbacks: Gas-assisted injection molding has a simple runner design with only a single runner. The gas flow path is unreasonable, the hollow structure molding effect is poor, and it is easy to cause product shrinkage and deformation. The nozzle structure has no plug, and the gas is sprayed directly upwards. This can easily create dead zones in the airflow on both sides of the nozzle, resulting in uneven gas output and a small diffusion range, which affects the uniformity of the hollow structure wall thickness. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an injection mold for an automotive radiator shroud. This mold optimizes the air-assisted flow channel and air nozzle structure to achieve efficient molding of the radiator shroud, reduce product shrinkage and deformation, and improve the molding quality of the hollow structure and the precision of the product appearance.

[0004] The technical solution adopted by this invention to solve its technical problem is: An injection mold for an automotive radiator cover includes a moving template, a fixed template, a moving mold base plate, a feed port, and an air nozzle. The moving template is fixedly connected to the moving mold base plate, and the feed port is located at the center of the moving mold base plate. A mold cavity is formed between the moving template and the fixed template, and the feed port is connected to the mold cavity. The air nozzle can blow air into the mold cavity, forming an air inlet and two air outlets in the mold cavity during air blowing. A first waste groove and a second waste groove are provided on the moving platen corresponding to the two air outlets. The air nozzle includes an air nozzle body and an air valve. The air valve includes a connecting column and a plug. A first air gap is formed between the connecting column and the air nozzle body, and a second annular air gap is formed between the plug and the air nozzle body.

[0005] The connecting post is flat and screwed onto the air nozzle body, with the plug located above the connecting post.

[0006] The moving template is equipped with an air pipe, a mold air passage, and two air nozzles. The air nozzles are connected to the air pipe through the mold air passage, and the air pipe is connected to an external air auxiliary device. High-pressure gas enters the mold cavity through the air pipe, the mold air passage, and the air nozzles, forming a hollow structure inside the product.

[0007] The hollow structure has a wall thickness of 3-4 mm and is formed by gas-assisted injection molding.

[0008] The air nozzle body is provided with a nut, the connecting post is provided with threads, the connecting post is engaged with the nut through the threads, and the plug is provided with a hexagonal groove.

[0009] The gas passes through the first and second air gaps on the nozzle, resulting in uniform gas output and increased diffusion range, thus avoiding the formation of dead airflow corners on both sides of the nozzle.

[0010] The injection mold is used to form an automotive radiator shroud, which includes an annular outer ring, mounting lugs, an annular inner ring, a first support beam, a connecting seat, a second support beam, and a third support beam. The outer ring has six mounting lugs, two of which extend into first support beams. Each first support beam extends into a second and a third support beam. The two second and third support beams extend into the other four mounting lugs. The outer ring has an inner ring, which is connected between the two first support beams via a connecting seat.

[0011] The air intake is formed inside the first support beam, and the air outlet is formed inside the second and third support beams.

[0012] The heat dissipation shroud also includes reinforcing ribs and inner ring teeth. Multiple reinforcing ribs are evenly distributed on the outer periphery of the annular outer ring, and multiple inner ring teeth are evenly distributed on the inner periphery of the annular outer ring.

[0013] By adjusting the holding time, blowing time, blowing speed, and blowing pressure, the deformation of the heat sink surface can be reduced.

[0014] The air nozzle can be replaced with a second air nozzle, which includes a second air nozzle body, an internal threaded ring, a connecting block, a vent hole, a round cap, a spray hole, a threaded rod, and a limiting ring. The upper part of the second air nozzle body is coaxially provided with an internal threaded ring, and multiple connecting blocks are provided on the outer periphery of the internal threaded ring. The multiple connecting blocks are connected to the inner periphery of the second air nozzle body, and multiple vent holes are formed between the multiple connecting blocks. The round cap covers the upper part of the second air nozzle body, and multiple spray holes are evenly distributed on the second air nozzle body. A threaded rod is fixed to the lower center of the round cap, and the threaded rod is threadedly connected to the internal threaded ring. A limiting ring is fixed on the threaded rod, and the limiting ring presses on the upper part of the internal threaded ring.

[0015] The beneficial effects of the injection mold for an automotive radiator shroud of the present invention are: The air-assisted flow channel design with one air inlet and two air outlets, combined with a double waste tank structure, makes the gas flow smoother and the hollow structure molding more stable, solving the defects of traditional single flow channel molding. The air nozzle is equipped with a valve structure with a plug, which ensures uniform air output and a wide diffusion range, eliminates dead airflow on both sides of the air nozzle, and ensures uniform wall thickness of the hollow structure. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0017] Figure 1 A schematic diagram of the structure of an injection mold for an automotive radiator shroud. Figure 1 ; Figure 2 A top view of an injection mold for an automotive radiator shroud; Figure 3 A bottom view of an injection mold for an automotive radiator shroud; Figure 4 A side view of an injection mold for an automotive radiator shroud; Figure 5 A schematic diagram of the structure of an injection mold for an automotive radiator shroud. Figure 2 ; Figure 6 Schematic diagram of the heat dissipation shroud Figure 1 ; Figure 7 Schematic diagram of the heat dissipation shroud Figure 2 ; Figure 8 for Figure 7 A magnified view of a portion of region A in the middle; Figure 9 This is a schematic diagram of the air nozzle structure; Figure 10 This is a schematic diagram of the structure of the first air gap and the second air gap; Figure 11 This is a schematic diagram of the internal structure of the air nozzle body; Figure 12 This is a schematic diagram of the second air nozzle. Figure 13 This is a schematic diagram of the second air nozzle. Figure 14 This is a schematic diagram of the structure of the second air nozzle body; Figure 15 This is a structural schematic diagram of the round-headed cap 1005; In the picture: 1. Heat dissipation shroud; 2. Moving mold plate; 3. Moving mold base plate; 4. Feed port; 5. First waste trough; 6. Second waste trough; 7. Air pipe; 8. Mold air passage; 9. Air nozzle; 10. Second air nozzle; Outer ring 101; mounting lug 102; inner ring 103; reinforcing rib 104; first support beam 105; connecting seat 106; second support beam 107; third support beam 108; inner ring teeth 109; Air nozzle body 901; connecting post 902; plug 903; hexagonal groove 904; first air gap 905; second air gap 906; nut 907; Second air nozzle body 1001; internal threaded ring 1002; connecting block 1003; vent hole 1004; round cap 1005; spray hole 1006; threaded rod 1007; limit ring 1008. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 –15 This invention will be described in further detail.

[0019] Example 1: An injection mold for an automotive radiator shroud, such as Figure 1 As shown in Figures 5 and 9-11, the system includes a moving mold plate 2, a fixed mold plate, a moving mold base plate 3, a feed inlet 4, and an air nozzle 9. The moving mold plate 2 and the moving mold base plate 3 are fastened together with high-strength bolts to ensure no relative displacement during mold closing and injection molding. The feed inlet 4 is machined into the center of the moving mold base plate 3, vertically penetrating the moving mold base plate 3 and communicating with the mold cavity. Molten plastic is injected into the mold cavity through the injection molding machine nozzle and feed inlet 4. After the moving mold plate 2 and the fixed mold plate are closed, a sealed cavity is formed, conforming to the shape of the automotive radiator shroud 1. The cavity surface is polished to ensure a smooth product surface.

[0020] An air pipe 7, a mold air passage 8, and two air nozzles 9 are installed on the moving template 2. One end of the air pipe 7 is sealed and connected to an external high-pressure air auxiliary device, and the other end is connected to the mold air passage 8. The mold air passage 8 is sealed and connected to the air nozzles 9. High-pressure gas enters the mold cavity in sequence through the air pipe 7, the mold air passage 8, and the air nozzles 9.

[0021] The air nozzle 9 includes an air nozzle body 901 and an air valve, which consists of a connecting post 902 and a plug 903. The connecting post 902 is a flat column with external threads machined on its outer wall. A nut 907 is fixed on the air nozzle body 901, and the connecting post 902 and the nut 907 are threaded together, allowing the air outlet gap to be adjusted by rotation. The plug 903 is integrally formed on the top of the connecting post 902, and a hexagonal groove 904 is formed on the top of the plug 903 to facilitate assembly and adjustment using an Allen wrench.

[0022] A first air gap 905 is formed between the connecting column 902 and the inner wall of the nozzle body 901, serving as the central main air outlet channel; a second annular air gap 906 is formed between the bottom surface of the plug 903 and the top surface of the nozzle body 901, serving as the circumferential auxiliary air outlet channel. High-pressure gas is simultaneously and evenly ejected from both the first air gap 905 and the second air gap 906, achieving synchronous diffusion in the center and circumference, increasing the gas coverage area, avoiding airflow dead zones on both sides of the nozzle 9, and ensuring uniform wall thickness of the hollow structure.

[0023] The gas forms one air inlet and two air outlets within the mold cavity. The air inlet corresponds to the interior of the first support beam 105 of the heat dissipation shroud 1, and the air outlets correspond to the interiors of the second support beam 107 and the third support beam 108, respectively. A first waste trough 5 and a second waste trough 6 are respectively provided on the moving mold plate 2 at the positions corresponding to the two air outlets. During the gas-assisted injection molding process, the gas pushes the plastic waste into the waste troughs, simultaneously forming a hollow structure with a wall thickness of 3–4 mm inside the product. This hollow structure is formed in one step by the gas-assisted injection molding process.

[0024] Example 2: The automotive radiator shroud 1 formed by this mold, such as... Figure 6 As shown in Figure 8, the structure includes an outer annular ring 101, mounting lugs 102, an inner annular ring 103, reinforcing ribs 104, a first support beam 105, a connecting seat 106, a second support beam 107, a third support beam 108, and inner ring teeth 109. The outer annular ring 101 has six mounting lugs 102 for fixing to the automotive radiator bolts; two of the mounting lugs 102 extend into the first support beams 105, and each first support beam 105 extends into a second support beam 107 and a third support beam 108. The two second support beams 107 and the third support beam 108 are respectively connected to the remaining four mounting lugs 102, forming a stable support structure. An inner annular ring 103 is provided inside the outer annular ring 101, and the inner annular ring 103 is fixedly connected between the two first support beams 105 via the connecting seat 106 for mounting the cooling fan. Multiple reinforcing ribs 104 are evenly distributed around the outer circumference of the annular outer ring 101 to enhance the structural strength of the product; multiple inner ring teeth 109 are evenly distributed around the inner circumference of the annular outer ring 101. The gas-assisted forming hollow structure is distributed inside the first support beam 105, the second support beam 107, and the third support beam 108, which effectively reduces the weight of the product while ensuring structural rigidity.

[0025] Working principle: Molten plastic is injected into the mold cavity through the inlet 4. Then, the external gas-assisted device is activated, and high-pressure nitrogen enters the nozzle 9 through the air pipe 7 and mold air passage 8, and is evenly sprayed into the cavity through the first air gap 905 and the second air gap 906. The gas flows along the internal channels of the first support beam 105, the second support beam 107, and the third support beam 108, pushing the molten plastic to adhere tightly to the cavity wall, while simultaneously blowing excess plastic waste into the first waste trough 5 and the second waste trough 6, forming a hollow structure with uniform wall thickness inside the support beams. By adjusting the holding time, blowing time, blowing speed, and blowing pressure, product shrinkage, warping, and surface deformation are reduced. After the product has fully cooled and solidified, the pressure is released, the mold is opened, and the injection molding machine's ejection mechanism ejects the automotive radiator shroud 1 from the moving platen 2, completing the entire molding cycle.

[0026] Example 3: like Figure 12-15As shown, the air nozzle 9 can be replaced by a second air nozzle 10. The second air nozzle 10 includes a second air nozzle body 1001, an internal threaded ring 1002, a connecting block 1003, a vent hole 1004, a round cap 1005, a spray hole 1006, a threaded rod 1007, and a limiting ring 1008. The upper part of the second air nozzle body 1001 is coaxially provided with the internal threaded ring 1002, and multiple connecting blocks 1003 are provided on the outer periphery of the internal threaded ring 1002. The multiple connecting blocks 1003 are connected to the second air nozzle body. Multiple air vents 1004 are formed between multiple connecting blocks 1003 on the inner circumference of 1001. A round cap 1005 covers the upper part of the second air nozzle body 1001. Multiple spray holes 1006 are evenly distributed on the second air nozzle body 1001. A threaded rod 1007 is fixed at the lower center of the round cap 1005. The threaded rod 1007 is threadedly connected to the inner threaded ring 1002. A limiting ring 1008 is fixed on the threaded rod 1007. The limiting ring 1008 presses on the inner threaded ring 1002.

[0027] After high-pressure gas enters the second nozzle body 1001, it enters the round cap 1005 through multiple vent holes 1004, and is then evenly sprayed out through the evenly distributed nozzles 1006. The round cap 1005 is easily disassembled by the engagement of the threaded rod 1007 and the internal threaded ring 1002. The limiting ring 1008 can limit the relative position of the internal threaded ring 1002 and the threaded rod 1007. When the limiting ring 1008 contacts the internal threaded ring 1002, the threaded rod 1007 and the round cap 1005 can no longer move relative to the second nozzle body 1001, thus stopping the round cap 1005 from moving after it is installed in place. The gas is sprayed out from all directions through the multiple nozzles 1006 on the round cap 1005, making the second nozzle 10 emit gas evenly and with a wide diffusion range. This also avoids dead air zones and ensures the quality of the hollow structure molding.

[0028] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An injection mold for an automotive radiator shroud, comprising a moving mold plate, a fixed mold plate, a moving mold base plate, a feed inlet, and an air nozzle, characterized in that: The moving template is fixedly connected to the moving mold base plate. The center of the moving mold base plate is provided with a feed port. A mold cavity is formed between the moving template and the fixed template. The feed port is connected to the mold cavity. The air nozzle can blow air into the mold cavity. When blowing air, an air inlet and two air outlets are formed in the mold cavity. A first waste trough and a second waste trough are provided on the moving platen corresponding to the two air outlet positions. The air nozzle includes an air nozzle body and an air valve. The air valve includes a connecting column and a plug. A first air gap is formed between the connecting column and the inner wall of the nozzle body, serving as the central main air outlet channel; a second annular air gap is formed between the bottom surface of the plug and the top surface of the nozzle body, serving as the circumferential auxiliary air outlet channel; high-pressure gas is simultaneously and evenly ejected from the first and second air gaps, achieving synchronous diffusion in the center and circumferential directions, increasing the gas coverage area, avoiding airflow dead zones on both sides of the nozzle, and ensuring uniform wall thickness of the hollow structure. The connecting post is flat and screwed onto the air nozzle body, with the plug located above the connecting post; The moving template is equipped with an air pipe, a mold air passage and two air nozzles. The air nozzles are connected to the air pipe through the mold air passage, and the air pipe is connected to an external air auxiliary device. High-pressure gas enters the mold cavity through the air pipe, mold air passage and air nozzle, forming a hollow structure inside the product. The injection mold is used to form an automotive radiator shroud, which includes an annular outer ring, mounting lugs, an annular inner ring, a first support beam, a connecting seat, a second support beam, and a third support beam. The outer ring is provided with six mounting lugs, two of which extend from a first support beam. Each first support beam extends from the end of a second support beam and a third support beam. The two second support beams and the third support beam extend to the other four mounting lugs. An inner ring is provided inside the outer ring, and the inner ring is connected between the two first support beams by a connecting seat. The air nozzle body is provided with a nut, the connecting post is provided with a thread, the connecting post is engaged with the nut through the thread, and the plug is provided with a hexagonal groove. The air intake is formed inside the first support beam, and the air outlet is formed inside the second and third support beams.

2. The injection mold for the automotive radiator shroud according to claim 1, characterized in that: The heat dissipation shroud also includes reinforcing ribs and inner ring teeth. Multiple reinforcing ribs are evenly distributed on the outer periphery of the annular outer ring, and multiple inner ring teeth are evenly distributed on the inner periphery of the annular outer ring.

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