Die-casting mould for shielding plates

Abstract

The utility model provides a kind of die casting die of shielding plate belongs to die casting die technical field, and includes: upper die, lower die and ejection mechanism, upper die is provided with feed inlet, feed runner and accommodating cavity, lower die is provided with mould core, upper die and lower die form cavity after moulding, ejection mechanism includes upper push plate and lower push plate, upper push plate is accommodated in accommodating cavity liftable, lower push plate is liftablely set in the bottom of lower die, this stage, collaborative work's ejection mechanism, by the "pre -ejection" of upper push plate and the "main ejection" of lower push plate combination, not only improve the stability and reliability of ejection, also optimize the ejection stress distribution, avoid the stress concentration or casting deformation problem possibly caused by single ejection mode, to ensure the dimensional accuracy and surface quality of casting, improve the degree of automation of mould and production efficiency simultaneously.

Description

Technical Field

[0001] This utility model belongs to the field of die-casting mold technology, and relates to a die-casting mold for a shielding plate. Background Technology

[0002] As electronic products develop towards thinner, lighter, and higher-performance designs, higher requirements are placed on the dimensional accuracy, surface quality, and structural integrity of internal shielding plates. Shielding plates are typically thin-walled, multi-cavity, and complex-profile metal parts. Traditional die-casting molds often use a single ejection mechanism for demolding, with the ejection force concentrated at the bottom of the casting. For shielding plates with complex structures or uneven wall thicknesses, uneven force can easily lead to ejection deformation, puncture, or excessive residual stress.

[0003] In summary, although some existing technical solutions have solved the problems of defects such as air bubbles in the die casting process of shielding plates, there is still considerable room for improvement due to the deformation caused by the thin walls of the castings during demolding. Summary of the Invention

[0004] The purpose of this utility model is to address the aforementioned problems existing in the prior art by proposing a die-casting mold for a shielding plate, comprising:

[0005] The upper mold is equipped with a feed inlet, a feed channel, and a receiving cavity;

[0006] The lower mold is provided with a mold core. After the upper mold and the lower mold are closed, a cavity is formed. The feed port is connected to the cavity through the feed channel.

[0007] The ejection mechanism includes an upper push plate and a lower push plate, the upper push plate being vertically and movably accommodated in the receiving cavity, and the lower push plate being vertically and movably disposed at the bottom of the lower mold.

[0008] In the die-casting mold of the shielding plate described above, both the upper push plate and the lower push plate are provided with push rods. When the upper mold and the lower mold are opened, the push rod of the upper push plate passes through the upper mold and extends into the cavity to eject the upper part of the casting, and the push rod of the lower push plate passes through the lower mold to eject the lower part of the casting.

[0009] The die-casting mold for the shielding plate described above also includes elastic elements, with at least two elastic elements. The elastic elements are housed in the receiving cavity, with one end of the elastic element contacting the top of the upper push plate and the other end of the elastic element contacting the upper bottom surface of the receiving cavity.

[0010] In the die-casting mold of the shielding plate described above, the upper bottom surface of the receiving cavity and the upper push plate are both provided with mounting holes, and the two ends of the elastic element are respectively accommodated in the receiving cavity and the mounting holes of the upper push plate.

[0011] In the die-casting mold of the shielding plate described above, the upper mold is further provided with a guide part, the upper push plate is provided with a guide groove, and the guide part is accommodated in the guide groove.

[0012] In the die-casting mold of the aforementioned shielding plate, the lower push plate is provided with a guide hole, the lower mold is provided with a guide post, and the lower push plate is accommodated in the guide hole through the guide post and moves up and down relative to the lower mold.

[0013] In the die-casting mold of the shielding plate described above, the mold core is provided with an exhaust channel, the lower mold is provided with an exhaust groove, one end of the exhaust channel is connected to the cavity, and the other end of the exhaust channel is connected to the exhaust groove.

[0014] In the die-casting mold of the shielding plate described above, the mold core is further provided with a slag-filling groove, the venting channel is connected to the cavity through the slag-filling groove, and one end of the push rod of the lower push plate passes through the lower mold and is disposed in the venting channel, the venting groove and the slag-filling groove.

[0015] The die-casting mold for the aforementioned shielding plate also includes a water-cooling channel, which is disposed in the lower mold.

[0016] In the die-casting mold of the aforementioned shielding plate, the upper mold is further provided with a casting sleeve, which is connected to the feed port.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This phased, collaborative ejection mechanism, by combining the "pre-demolding" of the upper ejector plate with the "main ejection" of the lower ejector plate, not only improves the smoothness and reliability of demolding, but also optimizes the ejection force distribution, avoiding the stress concentration or casting deformation problems that may be caused by a single ejection method. This ensures the dimensional accuracy and surface quality of the casting, while also improving the automation level and production efficiency of the mold.

[0019] 2. This structural design, which utilizes elastic elements to drive the upper push plate to achieve automatic pre-demolding, has advantages such as rapid response, simple structure, no need for external power source, and low maintenance cost.

[0020] 3. This double-ended embedded mounting structure effectively prevents the elastic element from shifting, tilting, twisting or slipping during compression and rebound, ensuring that it is always deformed along the axial direction and maintains good mechanical properties and motion stability. At the same time, the presence of the mounting hole restricts the lateral displacement of the elastic element, preventing it from bending or fatigue fracture due to instability during high-frequency repeated compression. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a half-sectional view of the present invention.

[0023] Figure 3 This is a top view of the interior of the mold of this utility model.

[0024] Figure 4 This is a schematic diagram of the push plate of this utility model.

[0025] Figure 5 This is a schematic diagram of the upper mold of this utility model.

[0026] Figure 6 This is a schematic diagram of the shielding plate.

[0027] In the picture:

[0028] 1. Upper mold; 11. Inlet; 12. Inlet channel; 13. Receiving cavity; 14. Guide section; 15. Casting sleeve; 2. Lower mold; 21. Mold core; 211. Venting channel; 212. Slag bag groove; 22. Guide post; 23. Venting groove; 24. Water cooling channel; 3. Cavity; 4. Ejection mechanism; 41. Upper push plate; 411. Mounting hole; 412. Guide groove; 42. Lower push plate; 421. Guide hole; 43. Ejector rod. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] The specific embodiments described herein are merely illustrative examples of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or adopt similar methods to replace them, but without departing from the patent of this utility model or exceeding the scope defined by the appended claims.

[0035] like Figures 1-6 As shown, a die-casting mold for a shielding plate includes: an upper mold 1, a lower mold 2, and an ejection mechanism 4.

[0036] The upper mold 1 is provided with a feed inlet 11, a feed channel 12, and a receiving cavity 13.

[0037] The lower mold 2 is provided with a mold core 21. After the upper mold 1 and the lower mold 2 are closed, a cavity 3 is formed. The feed port 11 is connected to the cavity 3 through the feed channel 12.

[0038] The ejection mechanism 4 includes an upper push plate 41 and a lower push plate 42. The upper push plate 41 is vertically and movably accommodated in the receiving cavity 13, and the lower push plate 42 is vertically and movably disposed at the bottom of the lower mold 2.

[0039] Specifically, after the die casting of the casting is completed and the mold is opened, the upper push plate 41, which is contained in the receiving cavity 13, descends. Its lower end first contacts the casting and pushes the casting, assisting the casting to initially separate from the upper mold 1. After the casting is separated from the upper mold 1, the upper end of the lower push plate 42 pushes the entire casting out.

[0040] In this embodiment, the phased and collaborative ejection mechanism, through the combination of the "pre-demolding" of the upper push plate 41 and the "main ejection" of the lower push plate 42, not only improves the smoothness and reliability of demolding, but also optimizes the ejection force distribution, avoiding the stress concentration or casting deformation problems that may be caused by a single ejection method, thereby ensuring the dimensional accuracy and surface quality of the casting, while improving the automation level and production efficiency of the mold.

[0041] like Figures 1-6 As shown, based on the above embodiment, both the upper push plate 41 and the lower push plate 42 are provided with push rods 43. When the upper mold 1 and the lower mold 2 are opened, the push rod 43 of the upper push plate 41 passes through the upper mold 1 and extends into the cavity 3 to eject the upper part of the casting, and the push rod 43 of the lower push plate 42 passes through the lower mold 2 to eject the lower part of the casting.

[0042] Specifically, both the upper push plate 41 and the lower push plate 42 are equipped with push rods 43. The push rods 43, as the key actuators of the ejection mechanism 4, are made of high-strength, wear-resistant alloy steel and are cylindrical. When the upper mold 1 and the lower mold 2 complete the die casting and begin the mold opening action, the upper push plate 41 descends, and the push rods 43 on the upper push plate 41 pass through the upper mold 1 and contact the casting to achieve pre-demolding. The lower push plate 42 rises, and the push rods 43 on the lower push plate 42 pass through the lower mold 2 and the mold core 21 to contact the casting and achieve demolding of the entire casting.

[0043] In this embodiment, the coordinated action of the upper push plate 41 and the push rod 43 pushing the upper part of the casting downwards, and the lower push plate 42 and the push rod 43 pushing the lower part of the casting upwards, forms a bidirectional ejection mechanism that can significantly improve the stability and safety of demolding.

[0044] like Figures 1-6 As shown, based on the above embodiment, it also includes an elastic element (not shown in the figure). The number of elastic elements is at least two. The elastic element is accommodated in the receiving cavity 13. One end of the elastic element contacts the top of the upper push plate 41, and the other end of the elastic element contacts the upper bottom surface of the receiving cavity 13.

[0045] Specifically, when the upper mold 1 and the lower mold 2 are closed, the mold is closed, the cavity 3 is formed, and the die casting is ready. During this process, the upper push plate 41 is subjected to an upward reaction force under the action of the internal structure of the mold, and is forced to move upward, thereby compressing the elastic element in the receiving cavity 13. When the die casting is completed and the mold enters the mold opening stage, the upper mold 1 begins to move upward and separates from the lower mold 2. The elastic potential energy stored in the elastic element is rapidly released, and the elastic element begins to recover its original deformation state, generating a downward thrust that directly acts on the upper push plate 41, pushing it to move downward along the receiving cavity 13, thus realizing the "pre-demolding" operation on the upper part of the casting.

[0046] In this embodiment, the structure design that uses an elastic element to drive the upper push plate 41 to achieve automatic pre-demolding has the advantages of rapid response, simple structure, no need for external power source, and low maintenance cost.

[0047] like Figures 1-6 As shown, based on the above embodiment, the upper bottom surface of the receiving cavity 13 and the upper push plate 41 are both provided with mounting holes 411, and the two ends of the elastic member are respectively accommodated in the mounting holes 411 of the receiving cavity 13 and the upper push plate 41.

[0048] Specifically, the mounting hole 411 on the top surface of the receiving cavity 13 is opened at the top of the receiving cavity 13 to fix the upper end of the elastic element, while the mounting hole 411 on the upper push plate 41 is located on its top surface and is axially aligned with the mounting hole 411 on the top surface of the receiving cavity 13 in the mold closing state. When the upper push plate 41 is placed in the receiving cavity 13, the lower end of the elastic element is inserted into the mounting hole 411 of the upper push plate 41, and the upper end is embedded in the mounting hole 411 on the top surface of the receiving cavity 13, thereby realizing the double limiting and fixing of both ends of the elastic element.

[0049] In this embodiment, the double-ended embedded mounting structure effectively prevents the elastic element from shifting, tilting, twisting or slipping during compression and rebound, ensuring that it is always deformed along the axial direction and maintaining good mechanical properties and motion stability. At the same time, the presence of the mounting hole 411 restricts the lateral displacement of the elastic element, preventing it from bending or fatigue fracture due to instability during high-frequency repeated compression.

[0050] like Figures 1-6 As shown, based on the above embodiment, the upper mold 1 is further provided with a guide portion 14, and the upper push plate 41 is provided with a guide groove 412, and the guide portion 14 is accommodated in the guide groove 412.

[0051] Specifically, the guide part 14 extends directly from the body of the upper mold 1, and its axis is arranged along the mold opening and closing direction (i.e., the vertical direction). The upper push plate 41 is provided with a matching guide groove 412, which penetrates along the thickness direction of the upper push plate 41. When the upper push plate 41 is installed in the receiving cavity 13 of the upper mold 1, the guide part 14 is inserted into the guide groove 412 of the upper push plate 41.

[0052] In this embodiment, the cooperation between the guide part 14 and the guide groove 412 effectively restricts the degree of freedom of the upper push plate 41 during the lifting process, preventing it from rotating, tilting or shifting laterally during movement, and ensuring that the upper push plate 41 always moves smoothly along a predetermined straight trajectory. Especially when multiple push rods 43 are arranged, the guide structure can avoid problems such as the push rods 43 getting stuck, asynchronous ejection or accelerated wear of the guide part 14 due to uneven force.

[0053] like Figures 1-6 As shown, based on the above embodiment, the lower push plate 42 is provided with a guide hole 421, the lower mold 2 is provided with a guide post 22, and the lower push plate 42 is accommodated in the guide hole 421 through the guide post 22 to move up and down relative to the lower mold 2.

[0054] In this embodiment, by providing guide holes 421 on the lower push plate 42 and configuring matching guide pillars 22 on the lower mold 2, a stable and reliable linear guide system is formed, enabling the lower push plate 42 to achieve precise, smooth and durable lifting and lowering movements relative to the lower mold 2. This not only ensures the smooth demolding of the casting, but also significantly improves the running accuracy of the mold.

[0055] like Figures 1-6 As shown, based on the above embodiment, the mold core 21 is provided with an exhaust channel 211, the lower mold 2 is provided with an exhaust groove 23, one end of the exhaust channel 211 is connected to the cavity 3, and the other end of the exhaust channel 211 is connected to the exhaust groove 23.

[0056] In this embodiment, the optimized exhaust channel 211 and exhaust groove 23 effectively solve various casting defects caused by obstructed exhaust, such as porosity, air bubbles, cold shuts and insufficient filling. By constructing an efficient exhaust system, it is ensured that the molten metal can smoothly and completely fill every corner and detail area of ​​the mold cavity 3, thereby significantly improving the internal density and surface forming quality of the casting.

[0057] like Figures 1-6 As shown, based on the above embodiment, the mold core 21 is also provided with a slag-filling groove 212, the venting channel 211 is connected to the cavity 3 through the slag-filling groove 212, and one end of the push rod 43 of the lower push plate 42 passes through the lower mold 2 and is provided in the venting channel 211, the venting groove 23 and the slag-filling groove 212.

[0058] Specifically, during the process of filling the cavity 3 with molten metal, the metal flow with a lower front temperature and more inclusions, along with the gas entrained along with it, is usually guided to the end area due to the flow trend and effectively captured and isolated by the specially designed slag trap 212.

[0059] In this embodiment, the design achieves directional control of impurities and gases, preventing them from flowing back or diffusing to the main cavity 3 and key functional parts of the casting, thereby significantly improving the metal purity of the main body of the casting and ensuring its dense structure and structural reliability.

[0060] like Figures 1-6 As shown, based on the above embodiment, a water-cooling channel 24 is also included, which is disposed in the lower mold 2.

[0061] Specifically, during the die casting process, the high-temperature molten alloy will rapidly release a large amount of heat after entering the mold cavity 3. If it cannot be discharged in time, it will not only prolong the solidification time, but may also lead to defects such as local overheating, casting deformation, shrinkage cavities, and porosity.

[0062] In this embodiment, by introducing circulating cooling water, the water cooling channel 24 can efficiently absorb and remove the heat accumulated in the mold during the filling and solidification stages, significantly accelerating the cooling and solidification speed of the casting. This not only greatly shortens the cooling time in each die casting cycle and improves cycle efficiency, but also helps to improve the uniformity and density of the internal structure of the casting.

[0063] like Figures 1-6 As shown, based on the above embodiment, the upper mold 1 is also provided with a casting sleeve, which is connected to the feed port 11.

[0064] In this embodiment, the casting sleeve 15 is installed inside the feed port 11 of the upper mold 1. When the die casting cycle starts, the molten die casting alloy is injected into the casting sleeve 15 by the die casting machine, and then smoothly introduced into the mold through the feed port 11, and finally fills the cavity 3. This structure can effectively protect the upper mold 1 body and prevent the high temperature molten metal from directly impacting the mold base, thereby significantly extending the overall service life of the mold.

Claims

1. A die-casting mold for a shielding plate, characterized in that, include: The upper mold is equipped with a feed inlet, a feed channel, and a receiving cavity; The lower mold is provided with a mold core. After the upper mold and the lower mold are closed, a cavity is formed. The feed port is connected to the cavity through the feed channel. The ejection mechanism includes an upper push plate and a lower push plate, the upper push plate being vertically and movably accommodated in the receiving cavity, and the lower push plate being vertically and movably disposed at the bottom of the lower mold.

2. The die-casting mold for a shielding plate as described in claim 1, characterized in that: Both the upper push plate and the lower push plate are provided with push rods. When the upper mold and the lower mold are opened, the push rod of the upper push plate passes through the upper mold and extends into the cavity to eject the upper part of the casting, and the push rod of the lower push plate passes through the lower mold to eject the lower part of the casting.

3. The die-casting mold for a shielding plate as described in claim 2, characterized in that: It also includes elastic elements, the number of which is at least two, the elastic elements are housed in the receiving cavity, one end of the elastic element contacts the top of the upper push plate, and the other end of the elastic element contacts the upper bottom surface of the receiving cavity.

4. The die-casting mold for a shielding plate as described in claim 3, characterized in that: The upper bottom surface of the receiving cavity and the upper push plate are both provided with mounting holes, and the two ends of the elastic element are respectively accommodated in the mounting holes of the receiving cavity and the upper push plate.

5. The die-casting mold for a shielding plate as described in claim 4, characterized in that: The upper mold is also provided with a guide part, and the upper push plate is provided with a guide groove, and the guide part is accommodated in the guide groove.

6. The die-casting mold for a shielding plate as described in claim 2, characterized in that: The push plate is provided with a guide hole, and the lower mold is provided with a guide post. The push plate is accommodated in the guide hole through the guide post and moves up and down relative to the lower mold.

7. The die-casting mold for a shielding plate as described in claim 2, characterized in that: The mold core is provided with an exhaust channel, and the lower mold is provided with an exhaust groove. One end of the exhaust channel is connected to the cavity, and the other end of the exhaust channel is connected to the exhaust groove.

8. The die-casting mold for a shielding plate as described in claim 7, characterized in that: The mold core is also provided with a slag pocket groove, and the venting channel is connected to the cavity through the slag pocket groove. One end of the push rod of the lower push plate passes through the lower mold and is disposed in the venting channel, the venting groove and the slag pocket groove.

9. The die-casting mold for a shielding plate as described in claim 1, characterized in that: It also includes a water-cooling channel, which is disposed in the lower mold.

10. The die-casting mold for a shielding plate as described in claim 1, characterized in that: The upper mold is also provided with a casting sleeve, which is connected to the feed port.

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