Automobile part mold ejector structure

Abstract

This utility model belongs to the field of stamping and calendering die technology, and discloses an ejector structure for an automotive parts die, including a die cavity. A punch cavity is provided on one side of the die cavity, and a die cavity is provided inside the punch cavity. A pressure plate is provided on the side of the die cavity adjacent to the punch cavity. A punch clearance hole is provided in the center of the pressure plate, and a punch is inserted into the punch clearance hole. A die protrusion corresponding to the die cavity is machined on the side of the punch adjacent to the die cavity. A die foot block is provided on the side of the punch away from the die cavity. Multiple sets of ejector pins are provided on the pressure plate. A first air port is provided at the end of the ejector pin, and a second air port is provided at the other end of the ejector pin away from the pressure plate. A gas channel is provided inside the ejector pin. The structure of this utility model is compact and reasonable, and can calender materials into a convex structure with a single-sided opening. It is suitable for producing automotive parts, and has high processing accuracy, high surface flatness, and good product quality.

Description

Technical Field

[0001] This utility model relates to the field of calendering die technology, specifically to an ejector structure for automotive parts dies. Background Technology

[0002] In the automotive parts manufacturing industry, calendering plays a crucial role. Calendering is a processing method that uses a die to apply pressure to sheet metal, causing it to plastically deform and thus obtaining parts of a specific shape. With the continuous development of the automotive industry, higher demands are being placed on the precision, quality, and production efficiency of parts.

[0003] However, existing stamping and calendering processes have revealed some thorny and urgent problems in practical applications. After the workpiece has undergone successful drawing and forming by the punch, a common phenomenon is that the workpiece becomes tightly fitted onto the punch. A deeper analysis reveals that during the critical stage of calendering, the punch applies strong and continuous pressure to the sheet material. Under this high pressure, the material gradually yields and undergoes plastic deformation, gradually conforming to the shape of the punch until it is perfectly molded into the desired workpiece. During this process, the material and the punch are tightly fitted, with almost no visible gaps between them. When the entire processing is completed and the pressure is released, a relatively closed, narrow space is formed between the material and the punch due to their previous tight fit. At this time, outside air cannot quickly enter this closed space, causing the finished workpiece to be firmly adhered to the punch under the strong negative pressure.

[0004] For thinner workpieces, the negative impact of this negative pressure adsorption is more pronounced and severe. During the critical demolding process, thin workpieces, due to their relatively weaker structural strength, are highly susceptible to uncontrollable deformation caused by negative pressure adsorption. Once deformed, the originally stringent dimensional accuracy requirements will deviate, and surface flatness will be difficult to maintain. Take automotive body panels as an example; these components have extremely high requirements for surface finish and dimensional accuracy. Even minute deformation can lead to inaccurate matching between the body panel and other parts during assembly, resulting in excessive gaps and uneven surfaces. This not only severely affects the overall aesthetics of the car but may also reduce its waterproof and dustproof performance, and even negatively impact its aerodynamic performance. Ultimately, a large number of products failing due to deformation are deemed scrap, significantly increasing production costs and severely reducing the company's production efficiency and market competitiveness. Therefore, how to effectively solve the demolding problem caused by the workpiece being adsorbed on the punch due to negative pressure in the stamping and calendering process has become a key technical bottleneck that the automotive parts manufacturing industry urgently needs to overcome. Researchers and technical experts in the industry need to explore innovative and practical solutions. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an ejector structure for automotive parts molds, which solves the problems of product deformation caused by negative pressure adsorption mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a mold ejector structure for automotive parts, including a concave mold, a convex mold cavity is provided on one side of the concave mold, a convex mold cavity is provided inside the convex mold cavity, a pressure plate is provided on the side of the concave mold adjacent to the convex mold cavity, a convex mold clearance hole is provided in the center of the pressure plate, and a convex mold is inserted into the convex mold clearance hole.

[0009] Preferably, the punch has a protrusion corresponding to the die cavity on the side adjacent to the die cavity, and a die foot block is provided on the side of the punch away from the die cavity.

[0010] Preferably, the pressure plate is provided with multiple sets of ejector pins, the pressure plate is provided with clearance holes corresponding to the ejector pins, the mold base block is provided with mating holes corresponding to the ejector pins, the ejector pins are inserted into the clearance holes and the mating holes, and the ends of the ejector pins are flush with the pressure plate.

[0011] Preferably, a first air port is provided at one end of the ejector pin, and a second air port is provided at the other end of the ejector pin away from the pressure plate. A gas channel is provided inside the ejector pin, which connects the first air port and the second air port. A gas channel bending area is provided in the middle of the gas channel corresponding to the mating hole.

[0012] Preferably, a cut-off baffle perpendicular to the demolding ejector pin is provided inside the mating hole, and a baffle groove is provided on the demolding ejector pin at the bend area of ​​the gas channel, and the cut-off baffle is slidably engaged in the baffle groove.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides an ejector structure for automotive parts molds, which has the following beneficial effects:

[0015] 1. The ejector structure of this automotive parts mold is equipped with a concave die, a pressure block, a punch, and a ejector pin, which can roll the material into a convex structure with a single-sided opening. It is suitable for the production of automotive parts and has high processing accuracy, high surface flatness, and good product quality.

[0016] 2. It is equipped with a punch cavity and the edge of the die cavity has a margin to facilitate better cooperation with the pressure plate for pressing and demolding. It provides a product ejection part for the ejector pin, and the ejection is not near the forming surface, which effectively avoids the slight deformation of the product caused by ejection, thereby ensuring that the processed product has high precision and excellent quality.

[0017] 3. It is equipped with a unique ejector pin with a gas channel inside, which allows gas to flow and balance the air pressure. This prevents the product from deforming and becoming uneven on the flange surface due to negative pressure adsorption after molding when it is fitted onto the punch. This greatly improves the flatness of the product and results in good product quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the pressure plate, punch, and ejector pin structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the gas channel inside the ejector pin of this utility model;

[0021] Figure 4 This is a schematic diagram of the cutting-off baffle of this utility model.

[0022] In the diagram: 1. Die cavity; 2. Punch cavity; 3. Cavity; 4. Pressure plate; 5. Punch clearance hole; 6. Punch; 7. Punch; 8. Die foot block; 9. Ejector pin; 10. Clearance hole; 11. Mating hole; 12. First air port; 13. Second air port; 14. Gas channel; 15. Gas channel bend area; 16. Cut-off baffle; 17. Baffle groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution:

[0025] A mold ejector structure for automotive parts includes a die cavity 1, a punch cavity 2 on one side of the die cavity 1, a die cavity 3 inside the punch cavity 2, and a pressure plate 4 on the side of the die cavity 1 adjacent to the punch cavity 2. A punch clearance hole 5 is formed in the center of the pressure plate 4, and a punch 6 is inserted into the punch clearance hole 5. During product forming, the raw material is first placed above the die cavity 1 by a feeding mechanism. The hydraulic rod of the press drives the pressure plate 4 to press against the die cavity 1, firmly fixing the edge of the material. The hydraulic rod connected to the punch 6 drives the punch 6 to move towards the punch cavity 2, drawing and forming the material within the punch cavity 2. The pressure plate 4 pressing against the edge of the material prevents irregular material movement, resulting in uniform and high-quality formed products.

[0026] Furthermore, a punch 7 corresponding to the die 3 is machined on the side of the punch 6 adjacent to the die 1, and a die foot block 8 is provided on the side of the punch 6 away from the die 1. The die 3 and the punch 7 are designed according to the workpiece structure to be processed as needed. After the device is fully pressed together, the product is formed in the gap between the die 3 and the punch 7.

[0027] Furthermore, the pressure plate 4 is equipped with multiple sets of ejector pins 9. The pressure plate 4 has clearance holes 10 corresponding to the ejector pins 9, and the mold base block 8 has mating holes 11 corresponding to the ejector pins 9. The ejector pins 9 are inserted into the clearance holes 10 and the mating holes 11, with the ends of the ejector pins 9 flush with the pressure plate 4. During demolding, the hydraulic rod drives the pressure plate 4 and the punch 6 to move away from the die 1. Due to negative pressure, the workpiece adheres to the protruding punch 7. The ejector pins 9 first move with the pressure plate 4 towards the direction away from the die 1, then stop moving midway, thus holding the product in place and separating it from the protruding punch 7, completing the demolding operation.

[0028] Furthermore, a first air port 12 is provided at one end of the ejector pin 9, and a second air port 13 is provided at the other end of the ejector pin 9 away from the pressure plate 4. A gas channel 14 is provided inside the ejector pin 9, connecting the first air port 12 and the second air port 13. A gas channel bend 15 is provided in the middle of the gas channel 14 corresponding to the mating hole 11. The gas channel 14 is used for air circulation to balance the air pressure inside and outside the product, which can prevent the negative pressure adsorption during demolding from causing the flange surface of the product to be adsorbed and deformed inward, resulting in a flatter and higher quality product.

[0029] Furthermore, a cutting-off plate 16 perpendicular to the ejector pin 9 is provided inside the mating hole 11. A cutting-off plate groove 17 is provided on the ejector pin 9 at the gas channel bending area 15, and the cutting-off plate 16 is slidably engaged in the cutting-off plate groove 17. The cutting-off plate 16 is used to control the opening and closing of the gas channel bending area 15. During the calendering operation, the die foot block 8 moves towards the die 1 along with the punch 6. The cutting-off plate 16 slides down in the cutting-off plate groove 17 to block the gas channel bending area 15. During the demolding operation, the relative movement direction of the punch 6 and the ejector pin 9 is opposite to that before. The cutting-off plate 16 moves upward in the cutting-off plate groove 17 to open the blocked gas channel bending area 15, and the gas can flow in the gas channel 14, thereby avoiding workpiece deformation caused by negative pressure adsorption.

[0030] Structural Description:

[0031] Die 1: The basic structure of the mold, with a punch cavity 2 on one side to provide support and partial shape constraint for product forming, and cooperates with the pressure plate 4 to fix the raw material;

[0032] Punch cavity 2: A cavity structure opened on one side of the die 1, which is the space for material drawing and forming. It has a shaped cavity 3 inside, which cooperates with the punch 6 to achieve product forming.

[0033] Concave 3: Located inside the cavity 2 of the punch, it corresponds to the protrusion 7 on the punch 6. The gap between the two determines the product molding shape and is a key structure for product molding.

[0034] Pressure plate 4: It is set on the side of the die cavity 1 near the punch cavity 2, and has a punch clearance hole 5 in the center. It is used to press down the edge of the raw material during molding to prevent the material from flowing irregularly.

[0035] Punch clearance hole 5: A hole-like structure opened in the center of the pressure plate 4, used to insert the punch 6, so that the punch 6 is not obstructed during the movement, ensuring the smooth progress of the forming operation;

[0036] Punch 6: Inserted into punch clearance hole 5, with a shaped punch 7 on the side adjacent to die 1 and a die foot block 8 on the side away from die 1. Driven by hydraulic rod, it moves in punch cavity 2 to draw and shape the material.

[0037] Punch 7: Machined on the side of punch 6 near die 1, and cooperates with die 3 to shape the material into the required shape during the material drawing process, thus determining the shape of one side of the product;

[0038] Die foot block 8: It is set on the side of the punch 6 away from the die 1 to provide support for the punch 6. At the same time, it has a mating hole 11 to cooperate with the ejector pin 9 to assist in the demolding operation.

[0039] Ejector pin 9: Set on pressure plate 4, there are multiple sets, installed through clearance hole 10 and mating hole 11, with a first air port 12 at the end, used to hold the product during demolding and separate it from the punch 6;

[0040] 10 clearance hole: It is formed on the pressure plate 4 and corresponds to the ejector pin 9. It provides space for the installation and movement of the ejector pin 9 and ensures that the ejector pin 9 works normally.

[0041] Mating hole 11: It is formed on the mold base block 8 and corresponds to the ejector pin 9, so that the ejector pin 9 passes through the mold base block 8 and cooperates with the pressure plate 4 to realize the ejection and demolding of the product;

[0042] First air inlet 12: Located at the end of the ejector pin 9, it is connected to the gas channel 14. During demolding, air enters to balance the internal and external air pressure of the product and prevent the product from deforming due to negative pressure adsorption.

[0043] The second air port 13 is located at the other end of the ejector pin 9 away from the pressure plate 4 and is connected to the gas channel 14. It is the outlet of the gas channel 14 and works with the first air port 12 to balance the air pressure.

[0044] Gas channel 14: It is set inside the demolding ejector pin 9, connecting the first air port 12 and the second air port 13. There is a gas channel bend area 15 in the middle for air circulation and to balance the air pressure inside and outside the product.

[0045] Gas channel bend zone 15: Located in the middle of the gas channel 14 at the corresponding mating hole 11, the gas channel 14 is controlled by the cut-off baffle 16 to control the gas channel 14 at different stages of calendering and demolding.

[0046] Cut-off baffle 16: It is set inside the mating hole 11, perpendicular to the demolding ejector pin 9, and is slidably engaged in the baffle groove 17. It is used to control the opening and closing of the gas channel bending area 15 to ensure the normal progress of the molding and demolding process.

[0047] Baffle groove 17: It is formed on the ejector pin 9 at the bend area 15 of the gas channel, and is used to install the cut-off baffle 16 so that the cut-off baffle 16 can slide in it to control the bend area 15 of the gas channel.

[0048] Working Principle: At the start of production, the feeding mechanism precisely places the raw material above the die cavity 1. Then, the hydraulic rod of the press quickly drives the pressure plate 4 downwards until it is tightly pressed against the die cavity 1. During this process, the pressure plate 4 firmly presses down on the edge of the raw material, securing it firmly to the die cavity 1. This operation is crucial because only by firmly fixing the raw material can irregular material movement be effectively prevented during subsequent processing, laying the foundation for high-quality product forming. Once the raw material is properly fixed, the hydraulic rod connected to the punch 6 begins to function, driving the punch 6 towards the punch cavity 2. At this time, the protruding punch 7 machined on the punch 6 cooperates with the protruding cavity 3 inside the die cavity 1. Since the protruding cavity 3 and protruding punch 7 are specifically designed according to the structure of the workpiece to be processed, as the punch 6 gradually penetrates deeper into the punch cavity 2, the material is stretched and formed in the gap between the protruding cavity 3 and protruding punch 7. Throughout the forming process, the pressure plate 4 always presses down on the edge of the material, continuously ensuring the stability of the material's position, thereby ensuring the uniform quality and high precision of the formed product. After the product is formed, it enters the demolding stage. The hydraulic rod actuates again, driving the pressure plate 4 and the punch 6 to move together toward the side away from the die 1. Since the product will adhere to the molded punch 7 due to negative pressure after molding, the ejector pin 9 begins to function at this time. The ejector pin 9 is pre-set on the pressure plate 4 and passes through the clearance hole 10 on the pressure plate 4 and the mating hole 11 on the mold base block 8. In the initial stage of demolding, the ejector pin 9 moves upward along with the pressure plate 4. When it reaches a certain position, the ejector pin 9 stops moving midway. At this point, the end of the ejector pin 9 will hold the product, allowing it to separate smoothly from the molded punch 7, thus completing the demolding operation. To further ensure product quality and avoid product deformation due to negative pressure adhesion during demolding, the ejector structure of this mold has been cleverly designed in the ejector pin 9. A first air port 12 is opened at one end of the ejector pin 9, and a second air port 13 is opened at the other end. An internal gas channel 14 is also provided, connecting the first air port 12 and the second air port 13. During demolding, gas can flow through gas channel 14, quickly balancing the air pressure inside and outside the product. This design effectively prevents negative pressure adsorption during demolding, which can cause the flange surface of the product to be adsorbed and deformed, thus ensuring a smoother finished product. Furthermore, the cut-off baffle 16 inside the hole 11 and the corresponding baffle groove 17 on the demolding ejector 9 further optimize the control of air pressure balance. During calendering, the die foot block 8 moves towards the die cavity 1 along with the punch 6. The cut-off baffle 16 slides down within the baffle groove 17, blocking the gas channel bend area 15 and preventing gas from interfering with the calendering process. When demolding begins, the relative movement direction of the punch 6 and the demolding ejector 9 changes, and the cut-off baffle 16 moves upward within the baffle groove 17, opening the blocked gas channel bend area 15, allowing gas to flow smoothly within the gas channel 14. This effectively prevents negative pressure adsorption from causing workpiece deformation, comprehensively ensuring high-quality product output.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ejector structure for an automotive parts mold, comprising a die (1), characterized in that: The die cavity (1) has a punch cavity (2) on one side, and a die cavity (3) is provided inside the punch cavity (2). A pressure plate (4) is provided on the side of the die cavity (1) adjacent to the punch cavity (2). A punch clearance hole (5) is provided in the center of the pressure plate (4), and a punch (6) is inserted into the punch clearance hole (5).

2. The ejector structure for an automotive parts mold according to claim 1, characterized in that: The punch (6) has a punch (7) corresponding to the die (3) on the side adjacent to the die (1), and a die foot block (8) is provided on the side of the punch (6) away from the die (1).

3. The ejector structure for an automotive parts mold according to claim 2, characterized in that: The pressure plate (4) is provided with multiple sets of demolding ejector pins (9). The pressure plate (4) is provided with clearance holes (10) corresponding to the demolding ejector pins (9). The mold foot block (8) is provided with mating holes (11) corresponding to the demolding ejector pins (9). The demolding ejector pins (9) are inserted into the clearance holes (10) and the mating holes (11), and the end of the demolding ejector pins (9) is flush with the pressure plate (4).

4. The ejector structure for an automotive parts mold according to claim 3, characterized in that: The demolding ejector (9) has a first air port (12) at one end and a second air port (13) at the other end away from the pressure plate (4). A gas channel (14) is provided inside the demolding ejector (9). The gas channel (14) connects the first air port (12) and the second air port (13). A gas channel bend area (15) is provided in the middle of the gas channel (14) corresponding to the mating hole (11).

5. The ejector structure for an automotive parts mold according to claim 4, characterized in that: The inner side of the mating hole (11) is provided with a cut-off baffle (16) perpendicular to the demolding ejector (9). A baffle groove (17) is provided on the demolding ejector (9) at the bend area (15) of the gas channel. The cut-off baffle (16) is slidably engaged in the baffle groove (17).

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