A die-casting die for a magnesium alloy support of a double screen of an automobile instrument

Abstract

The application relates to the technical field of die-casting molds, and discloses a magnesium alloy bracket die-casting mold for double screens of automobile instruments, which comprises a base and a top plate, the base is fixed with a lower mold, the top plate is fixed with an upper mold matched with the lower mold, the surface of the lower mold and the surface of the upper mold are jointly provided with a model groove for forming a magnesium alloy bracket, the inside of the lower mold is slidably provided with a plurality of groups of first ejecting pins and second ejecting pins for ejecting the magnesium alloy bracket, the second ejecting pins are used for ejecting the magnesium alloy bracket from the inside of the model groove after the first ejecting pins eject the magnesium alloy bracket from the inside of the model groove, and the magnesium alloy bracket is subjected to secondary ejection treatment. According to the technical scheme, the magnesium alloy bracket is subjected to step-by-step ejection, the ejection force can be dispersed, local stress concentration can be avoided, the risk that the magnesium alloy bracket is deformed or cracked during demolding can be effectively reduced, and the demolding effect is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of die-casting mold technology, specifically to a die-casting mold for a magnesium alloy bracket for a dual-screen automotive instrument panel. Background Technology

[0002] As automotive center console designs increasingly adopt and evolve towards a "dual-screen" layout, the integrated design of the instrument panel and central control display has become a mainstream trend in the industry. Under this trend, the magnesium alloy bracket, as the core structural component supporting and carrying the entire dual-screen system, is particularly crucial in its manufacturing process. Currently, this component is typically produced using advanced high-pressure die-casting molding technology. Specifically, this process involves precisely pouring molten magnesium alloy material at high temperatures into a pre-prepared, specialized die-casting mold cavity for shaping.

[0003] After the magnesium alloy bracket is formed, it needs to be ejected from the mold groove using an ejector pin device. In existing production processes, a one-time direct ejection method is typically used, where the ejector pin applies force in one go to completely eject the magnesium alloy bracket from the mold groove. However, this direct ejection method has some obvious problems in actual operation. For example, the magnesium alloy bracket experiences concentrated force at the moment of ejection, which can easily lead to localized stress concentration, resulting in defects such as deformation and cracks. Furthermore, the friction between the mold and the bracket is relatively high during the one-time ejection process, which can easily cause the bracket to tear or make demolding difficult, resulting in poor demolding performance. Summary of the Invention

[0004] This invention provides a die-casting mold for a magnesium alloy bracket of a dual-screen automotive instrument panel. By ejecting the magnesium alloy bracket in stages, the ejection force can be dispersed, avoiding local stress concentration, and solving the problem of poor demolding effect mentioned in the background art.

[0005] This invention provides the following technical solution: a die-casting mold for a magnesium alloy bracket of a dual-screen automotive instrument panel, comprising a base and a top plate. A lower mold is fixed on the base, and an upper mold that cooperates with the lower mold is fixed on the top plate. The surfaces of the lower mold and the upper mold are jointly provided with a mold groove for forming the magnesium alloy bracket. Several sets of first ejector pins and second ejector pins are slidably arranged inside the lower mold for ejecting the magnesium alloy bracket. After the first ejector pins are ejected from the mold groove, the second ejector pins are ejected from the mold groove again, thus performing a secondary ejection process on the magnesium alloy bracket.

[0006] As an optional solution of the magnesium alloy bracket die-casting mold for the dual-screen automotive instrument panel of the present invention, the lower mold has an internal receiving groove, and a first ejector plate is slidably arranged inside the receiving groove. The bottom of the first ejector pin is fixed on the first ejector plate, and a first servo electric cylinder for driving the first ejector plate to rise and fall is fixed on the lower surface of the lower mold.

[0007] As an optional solution of the magnesium alloy bracket die-casting mold for the dual-screen automotive instrument panel of the present invention, a second ejector plate is slidably arranged inside the receiving groove, the bottom of the second ejector pin is fixed on the second ejector plate, and a second servo electric cylinder that drives the second ejector plate to rise and fall is fixed on the lower surface of the lower mold.

[0008] As an optional solution for the die-casting mold of the magnesium alloy bracket for the dual-screen automotive instrument panel of the present invention, the lower mold is provided with a vent hole communicating with the receiving groove, and the first ejector pin is provided with a vent groove communicating with the receiving groove. When the first ejector pin is ejected, the vent groove connects the bottom of the mold groove with the vent hole to balance the air pressure.

[0009] As an optional solution of the magnesium alloy bracket die-casting mold for the dual-screen automotive instrument panel of the present invention, a crossbar is fixed on the outer surface of the first ejector plate, a sliding groove for the crossbar to slide is opened inside the lower mold, a sealing block for sealing the air guide hole is fixed on the surface of the crossbar, and a through hole for communicating with the air guide hole is opened on the sealing block.

[0010] As an optional solution for the die-casting mold of the dual-screen magnesium alloy bracket for automobile instrument panel of the present invention, both the upper mold and the lower mold are provided with cooling water pipes for cooling the model groove, and the top plate is provided with a pouring port communicating with the model groove.

[0011] As an optional solution for the die-casting mold of the magnesium alloy bracket for the dual-screen automotive instrument panel of the present invention, the upper mold has a fixed post at each of the four corners, and the lower mold has a socket at each of the four corners for inserting the post.

[0012] As an optional solution for the die-casting mold of the dual-screen magnesium alloy bracket for automotive instrument panels described in this invention, a stop block is fixed on the top wall of the receiving groove.

[0013] The present invention has the following beneficial effects:

[0014] 1. The die-casting mold for the magnesium alloy bracket of the dual-screen automotive instrument panel uses a first ejector pin to push the formed magnesium alloy bracket upwards, effectively releasing most of the clamping force of the mold groove on the magnesium alloy bracket. On this basis, the second ejector pin continues to push the magnesium alloy bracket completely out of the mold groove. This step-by-step ejection method can significantly disperse the ejection force, avoid local stress concentration, thereby reducing the risk of deformation or cracking of the magnesium alloy bracket during demolding and effectively improving the demolding effect.

[0015] 2. The die-casting mold for the dual-screen automotive instrument panel magnesium alloy bracket utilizes a design where the first ejector pin moves upward, causing the venting groove to move upward simultaneously. This connects the top of the venting groove with the bottom of the mold groove, allowing the sealed space between the magnesium alloy bracket and the mold groove to connect to the outside environment sequentially through the venting groove, the receiving groove, and the air guide hole. This effectively balances the air pressure at the bottom of the mold groove. This design avoids the problem of increased demolding resistance due to negative pressure during the second ejection, significantly improving demolding smoothness and ensuring better demolding results.

[0016] 3. The die-casting mold for the magnesium alloy bracket of the dual-screen automotive instrument panel, through the setting of the sealing plate and through hole, ensures that the air guide hole only opens when the magnesium alloy bracket is demolded. Without affecting the air pressure balance, it effectively shortens the opening time of the air guide hole, thereby significantly reducing the possibility of foreign objects entering the air guide hole, improving the reliability of mold use and product quality, and has a simple structure and better performance. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure during mold opening for the present invention.

[0019] Figure 3 This is a cross-sectional view of the internal structure of the lower mold in this invention.

[0020] Figure 4 This is a three-dimensional structural diagram of the first ejector plate and the second ejector plate in this invention.

[0021] Figure 5 This is a schematic diagram of the structure of the first ejector pin in this invention.

[0022] Figure 6 For the present invention Figure 3 Enlarged view of point A in the middle.

[0023] Figure 7 For the present invention Figure 3 Enlarged view of section B in the middle.

[0024] In the diagram: 1. Base; 2. Top plate; 3. Lower mold; 4. Upper mold; 5. Mold groove; 6. First ejector pin; 7. Second ejector pin; 8. Receiving groove; 9. First ejector plate; 10. First servo electric cylinder; 11. Second ejector plate; 12. Second servo electric cylinder; 13. Air guide hole; 14. Vent groove; 15. Crossbar; 16. Slide groove; 17. Sealing block; 18. Through hole; 19. Cooling water pipe; 20. Pouring port; 21. Insertion column; 22. Insertion hole; 23. Stop block. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1, please refer to Figures 1-7 A die-casting mold for a magnesium alloy bracket of a dual-screen automotive instrument panel includes a base 1 and a top plate 2. A lower mold 3 is fixed on the base 1, and an upper mold 4 that cooperates with the lower mold 3 is fixed on the top plate 2. The surfaces of the lower mold 3 and the upper mold 4 are jointly provided with a mold groove 5 for forming the magnesium alloy bracket. Several sets of first ejector pins 6 and second ejector pins 7 are slidably arranged inside the lower mold 3 for ejecting the magnesium alloy bracket. After the first ejector pin 6 is ejected from the mold groove 5, the second ejector pin 7 is ejected from the mold groove 5 again, thus performing a secondary ejection process on the magnesium alloy bracket.

[0027] The lower mold 3 has an internal receiving groove 8, and a first ejector plate 9 is slidably disposed inside the receiving groove 8. The bottom of the first ejector pin 6 is fixed on the first ejector plate 9, and a first servo electric cylinder 10 for driving the first ejector plate 9 to rise and fall is fixed on the lower surface of the lower mold 3.

[0028] The inner cavity of the receiving groove 8 is provided with a second ejector plate 11, the bottom of the second ejector pin 7 is fixed on the second ejector plate 11, and the lower surface of the lower mold 3 is fixed with a second servo electric cylinder 12 that drives the second ejector plate 11 to rise and fall.

[0029] Both the upper mold 4 and the lower mold 3 are equipped with cooling water pipes 19 for cooling the model groove 5, and the top plate 2 is equipped with a pouring port 20 that communicates with the model groove 5.

[0030] In this technical solution, when die-casting the magnesium alloy bracket for a dual-screen automotive instrument panel, the upper mold 4 and the lower mold 3 are first closed. Magnesium alloy liquid is poured through the pouring port 20, and then cooling water is supplied through the cooling water pipe 19. The mold tank 5 is provided with a flow channel connected to the cooling water pipe. The cooling water can cool the inside of the mold tank 5 through the flow channel, so that the magnesium alloy liquid is cooled and formed into a magnesium alloy bracket. Then, the mold is opened and the formed magnesium alloy bracket is taken out from the mold tank 5. The structure of the lower mold 3 and the upper mold 4 and the process of die-casting the magnesium alloy bracket are all existing technologies and are not the innovation of this application. No further details are provided.

[0031] When it is necessary to remove the molded magnesium alloy bracket from the mold groove 5, the first servo cylinder 10 pushes the first ejector plate 9 to slide upward inside the receiving groove 8. The first ejector plate 9 drives the first ejector pin 6 to move upward, so that the first ejector pin 6 pushes the molded magnesium alloy bracket upward by 4-6mm. The first servo cylinder 10 stops. Then, the second servo cylinder 12 pushes the second ejector plate 11 to move upward. The second ejector plate 11 drives the second ejector pin 7 to move upward, so that the second ejector pin 7 continues to push the molded magnesium alloy bracket completely out of the mold groove 5. In the above process, the first ejector pin 6 pushes the molded magnesium alloy bracket upward a certain distance first, which can release most of the clamping force of the mold groove 5 on the magnesium alloy bracket. Then, the second ejector pin 7 pushes the magnesium alloy bracket out, which can disperse the ejection force, avoid local stress concentration, thereby reducing deformation or cracking, and thus increasing the demolding effect.

[0032] In this technical solution, each of the four corners of the upper mold 4 is fixed with a pin 21, and each of the four corners of the lower mold 3 is provided with a hole 22 for the pin 21 to be inserted. When the mold is closed, the pin 21 is inserted into the hole 22, which can increase the stability of the mold closing and make the lower mold 3 and the upper mold 4 fit together more accurately, avoiding mold closing deviation.

[0033] In Example 2, after the first ejection, a sealed space is formed between the bottom of the mold groove 5 and the magnesium alloy support. To continue ejecting the magnesium alloy support, it is necessary to overcome the negative pressure. The presence of negative pressure increases the resistance during demolding of the magnesium alloy support, thus affecting the smoothness of the second ejection. This example addresses this problem by improving upon Example 1. For details, please refer to [link to example]. Figures 1-7 The lower mold 3 has an air guide hole 13 that communicates with the receiving groove 8, and the first ejector pin 6 has an air vent 14 that communicates with the receiving groove 8. When the first ejector pin 6 is ejected, the air vent 14 connects the bottom of the mold groove 5 with the air guide hole 13 to balance the air pressure.

[0034] In this technical solution, such as Figure 3 , Figure 5and Figure 6 As shown, during the process of the first ejector pin 6 moving upward and pushing the magnesium alloy bracket out of the mold groove 5 by 4-6mm, the first ejector pin 6 drives the venting groove 14 to move upward, so that the top of the venting groove 14 is connected to the bottom of the mold groove 5. At this time, the sealed space formed between the magnesium alloy bracket and the mold groove 5 is connected to the outside through the venting groove 14, the receiving groove 8, and the air guide hole 13, thereby balancing the air pressure at the bottom of the mold groove 5. This prevents the resistance of the magnesium alloy bracket from increasing during demolding due to the negative pressure during the second ejection, thus making demolding smoother and the demolding effect better.

[0035] In this technical solution, a stop block 23 is fixed on the top wall of the receiving groove 8. By setting the stop block 23, the upward movement of the first ejector plate 9 can be restricted. When the first ejector plate 9 contacts the stop block 23, the first servo electric cylinder 10 stops. At this time, the top of the ventilation groove 14 is located in the model groove 5, and the bottom of the ventilation groove 14 is located in the receiving groove 8, so as not to affect the ventilation effect.

[0036] In Example 3, when balancing the air pressure between the air guide hole 13 and the air vent 14, if the air guide hole 13 remains open, the possibility of foreign objects entering the air guide hole 13 increases, easily causing it to become blocked, thus affecting the negative pressure balancing effect. To address this issue, this example is an improvement based on Example 2. For details, please refer to... Figures 1-7 A crossbar 15 is fixed on the outer surface of the first ejector plate 9. A sliding groove 16 is provided inside the lower mold 3 for the crossbar 15 to slide. A sealing block 17 for sealing the air guide hole 13 is fixed on the surface of the crossbar 15. A through hole 18 for communicating with the air guide hole 13 is provided on the sealing block 17.

[0037] In this technical solution, such as Figure 3 , Figure 4 and Figure 7 As shown, when the first ejector plate 9 moves the first ejector pin 6 upward, that is, during the first ejection of the magnesium alloy bracket, the first ejector plate 9 moves the crossbar 15 upward synchronously. The crossbar 15 slides upward in the slide groove 16, and the crossbar 15 moves the sealing block 17 upward. The sealing block 17 moves the through hole 18 upward. When the top of the venting groove 14 is connected to the inside of the mold groove 5, the through hole 18 is connected to the air guide hole 13, so that air pressure balance can be achieved. When the first ejector plate 9 moves the first ejector pin 6 to reset, the sealing plate moves downward, causing the through hole 18 to be misaligned with the air guide hole 13, and the air guide hole 13 is sealed again. Through the above process, the air guide hole 13 will only open when the magnesium alloy bracket is demolded, thereby reducing the opening time of the air guide hole 13 and reducing the possibility of foreign objects entering the air guide hole 13.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A die-casting mold for a magnesium alloy bracket of a dual-screen automotive instrument panel, comprising a base (1) and a top plate (2), characterized in that: A lower mold (3) is fixed on the base (1), and an upper mold (4) that cooperates with the lower mold (3) is fixed on the top plate (2). The surfaces of the lower mold (3) and the upper mold (4) are jointly provided with a mold groove (5) for forming a magnesium alloy bracket. Several sets of first ejector pins (6) and second ejector pins (7) for ejecting the magnesium alloy bracket are slidably arranged inside the lower mold (3). The second ejector pin (7) is ejected from the mold groove (5) after the first ejector pin (6) is ejected from the mold groove (5), thus performing a secondary ejection process on the magnesium alloy bracket.

2. The die-casting mold for the dual-screen automotive instrument panel magnesium alloy bracket according to claim 1, characterized in that: The lower mold (3) has an internal receiving groove (8), and a first ejector plate (9) is slidably disposed inside the receiving groove (8). The bottom of the first ejector pin (6) is fixed on the first ejector plate (9), and a first servo electric cylinder (10) for driving the first ejector plate (9) to rise and fall is fixed on the lower surface of the lower mold (3).

3. The die-casting mold for the dual-screen automotive instrument panel magnesium alloy bracket according to claim 2, characterized in that: The second ejector plate (11) is slidably disposed inside the receiving groove (8), the bottom of the second ejector pin (7) is fixed on the second ejector plate (11), and the lower surface of the lower mold (3) is fixed with a second servo electric cylinder (12) that drives the second ejector plate (11) to rise and fall.

4. The die-casting mold for the dual-screen automotive instrument panel magnesium alloy bracket according to claim 3, characterized in that: The lower mold (3) is provided with an air guide hole (13) that communicates with the receiving groove (8), and the first ejector pin (6) is provided with a ventilation groove (14) that communicates with the receiving groove (8). When the first ejector pin (6) is ejected, the ventilation groove (14) connects the bottom of the mold groove (5) with the air guide hole (13) to balance the air pressure.

5. The die-casting mold for the dual-screen automotive instrument panel magnesium alloy bracket according to claim 4, characterized in that: A crossbar (15) is fixed on the outer surface of the first ejector plate (9). A groove (16) for sliding the crossbar (15) is provided inside the lower mold (3). A blocking block (17) for sealing the air guide hole (13) is fixed on the surface of the crossbar (15). A through hole (18) for communicating with the air guide hole (13) is provided on the blocking block (17).

6. The die-casting mold for the dual-screen automotive instrument panel magnesium alloy bracket according to claim 5, characterized in that: The upper mold (4) and the lower mold (3) are both provided with cooling water pipes (19) for cooling the model groove (5), and the top plate (2) is provided with a pouring port (20) that communicates with the model groove (5).

7. The die-casting mold for the dual-screen automotive instrument panel magnesium alloy bracket according to claim 6, characterized in that: The upper mold (4) has four corners with fixed inserts (21), and the lower mold (3) has four corners with insertion holes (22) for inserting the inserts (21).

8. The die-casting mold for the dual-screen automotive instrument panel magnesium alloy bracket according to claim 7, characterized in that: A stop (23) is fixed on the top wall of the receiving groove (8).

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