Automatic material withdrawing mechanism of a stamping die

Abstract

The utility model discloses an automatic material returning mechanism of punch die belongs to punch die technical field, and the fixed die is close to the fixed die groove that is set up in dynamic die one end, it can realize through the collaborative cooling of material returning inner mould and cooling inner mould, has realized the even temperature control of the whole process of workpiece from forming to cooling, and the frame mode of material returning inner mould is equipped with the communicating reserved cavity between the boost mode, can inject the coolant through the water injection hole, directly to the efficient cooling of dynamic die side workpiece, and multiple ductility heat conduction silk connection matrix distribution's magnetic push block, can evenly disperse the local heat of single magnetic push block to the whole workpiece bottom, avoids the stress concentration that leads to the uneven cooling, and the cooling inner mould in fixed die groove, further balances workpiece overall temperature field, effectively reduces the workpiece warping, cracking defect that produces because of uneven cold and hot, has improved the size precision and appearance quality of workpiece after punch forming significantly.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and more specifically, to an automatic unloading mechanism for stamping dies. Background Technology

[0002] Stamping dies are core equipment in the metal processing field. Their degree of automation directly determines production efficiency and workpiece quality. As a key component of stamping dies, the automatic unloading mechanism needs to quickly and stably separate the workpiece from the die or punch after stamping to avoid workpiece sticking, deformation, or jamming.

[0003] Chinese Patent Announcement No. CN211027758U discloses a pneumatic automatic ejection stamping die. This patent describes a device that, upon normal startup of the stamping machine, pushes a support plate to move the upper die and cylindrical rod downwards. Simultaneously, the cylindrical rod moves downwards, pushing a first connecting plate, a connecting rod, a second connecting plate, and a rubber pad downwards. The rubber pad moves upwards on the outer wall of the connecting rod and contacts the first connecting plate. The rubber pad compresses the air inside the cylindrical cavity downwards and forces it into the inner cavity of an air storage cylinder via a one-way valve. When the upper die moves out of the die cavity, a solenoid valve opens, and high-pressure gas is blown upwards through a connecting pipe, ejecting the workpiece from the top of the baffle plate into the die cavity, thus achieving pneumatic demolding. This device effectively achieves pneumatic automatic demolding of stamped workpieces, preventing deformation due to uneven force during demolding. This improves the quality and pass rate of workpiece processing, is simple to operate, convenient to use, and increases the practicality of stamping dies, better meeting actual usage needs.

[0004] However, during the demolding and unloading process, the aforementioned patent not only suffers from uneven cooling of the workpiece, which can easily lead to deformation of the unshaped parts due to stress, but also from the fact that the pneumatic extrusion cannot fully push the workpiece out, which can easily lead to the problem of the workpiece being partially ejected and partially stuck. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] To address the problems existing in the prior art, the purpose of this utility model is to provide an automatic ejection mechanism for stamping dies. It can achieve uniform temperature control of the workpiece throughout the entire process from forming to cooling by coordinating the ejection inner die and the cooling inner die. The ejection inner die has a pre-reserved cavity between the frame die and the pusher die, through which coolant can be injected to directly and efficiently cool the workpiece on the moving die side. At the same time, multiple flexible heat-conducting wires are connected to a matrix of magnetic push blocks, which can evenly distribute the local heat of a single magnetic push block to the bottom of the entire workpiece, avoiding stress concentration caused by uneven cooling. In conjunction with the cooling inner die in the fixed die groove, the overall temperature field of the workpiece is further balanced, effectively reducing workpiece warping and cracking defects caused by uneven heating and cooling, and significantly improving the dimensional accuracy and appearance quality of the workpiece after stamping.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] An automatic ejection mechanism for a stamping die includes a fixed die and a moving die. The fixed die has a fixed die groove at one end near the moving die, and the moving die has a moving die groove at one end near the fixed die. An ejection inner die is fixedly connected to the inner end of the moving die groove. An injection hole is provided at the end of the fixed die away from the moving die. Water inlet holes are provided at the outer ends of both the fixed die and the moving die. A water injection hole is provided at the end of the moving die away from the fixed die. An edge sealing plate is fixedly connected to the end of the fixed die near the moving die, and a retaining frame groove is provided at the end of the moving die near the fixed die. The ejection inner die is used to cool the injection-molded workpiece thoroughly and evenly, and automatically ejects the workpiece.

[0010] Furthermore, the ejector inner mold includes a frame mold, which is fixedly connected to the inner end of the moving mold groove. A pusher mold is fixedly connected to the inner end of the frame mold. A reserved cavity is opened between the frame mold and the pusher mold, and a pair of reserved cavities are connected. The water injection hole is connected to the reserved cavity. Coolant is injected into the reserved cavity through the water injection hole, and the frame mold and the pusher mold are used to fully cool the shaped workpiece.

[0011] Furthermore, the ejection inner mold also includes an ejection aid mold, which is fixedly connected to the pusher mold near the fixed mold end. The ejection aid mold away from the pusher mold end is inlaid with a plurality of matrix-distributed magnetic push blocks. An electromagnetic plate is inlaid in the inner end of the moving mold groove. The electromagnetic plate is activated to magnetize and repel the plurality of magnetic push blocks, thereby using the plurality of matrix-distributed magnetic push blocks to squeeze the shaped workpiece and the ejection aid mold to adhere.

[0012] Furthermore, the ejector inner mold also includes a high-temperature resistant airbag, which is fixedly connected between the pusher mold and the electromagnetic plate. The high-temperature resistant airbag is inflated and expands to squeeze the pusher mold, thereby causing the pusher mold to push the workpiece off the inner wall of the frame mold and preventing it from sticking to the inner wall of the frame mold.

[0013] Furthermore, the ejector inner mold also includes multiple flexible heat-conducting wires, which are fixedly connected between multiple magnetic push blocks. Through the flexibility of the flexible heat-conducting wires, the temperature of a single magnetic push block can be evenly distributed and conducted to multiple magnetic push blocks without affecting the sliding protrusion of the magnetic push blocks, thereby making the bottom of the workpiece cool evenly.

[0014] Furthermore, a cooling inner mold is fixedly connected to the inner end of the fixed mold groove, and an oil film is fixedly connected to the inner wall of the cooling inner mold. The cooling inner mold can conduct the temperature of the ejector inner mold to make the injection molded workpiece heat and cool evenly, and the oil film can reduce the sticking of the workpiece.

[0015] 3. Beneficial effects

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] (1) This solution achieves uniform temperature control of the workpiece throughout the entire process from forming to cooling by coordinating the cooling of the ejection inner mold and the cooling inner mold. The ejection inner mold has a pre-reserved cavity between the frame mold and the push mold, through which coolant can be injected to directly and efficiently cool the workpiece on the moving mold side. At the same time, multiple tough heat-conducting wires are connected to a matrix of magnetic push blocks, which can evenly distribute the local heat of a single magnetic push block to the bottom of the entire workpiece, avoiding stress concentration caused by uneven cooling. Combined with the cooling inner mold in the fixed mold groove, the overall temperature field of the workpiece is further balanced, effectively reducing workpiece warping and cracking defects caused by uneven heating and cooling, and significantly improving the dimensional accuracy and appearance quality of the workpiece after stamping.

[0018] (2) In this solution, the electromagnetic plate in the moving mold groove can be activated and magnetized, generating a repulsive force on the magnetic push block on the ejector mold, causing the magnetic push block to bulge out and squeeze the workpiece synchronously, quickly releasing the local adhesion between the workpiece and the ejector mold. When the high-temperature resistant airbag between the ejector mold and the electromagnetic plate is inflated, it can form a uniform pushing force on the ejector mold, pushing the workpiece away from the inner wall of the frame mold, avoiding the workpiece from getting stuck in the moving mold groove. Combined with the oil film on the inner wall of the fixed mold cooling inner mold, the adhesion between the workpiece and the fixed mold side is reduced, forming a double guarantee of active ejection by the moving mold and reduced adhesion by the fixed mold. No manual intervention is required throughout the process, the material removal success rate is high, and the continuity and efficiency of stamping production are effectively improved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a front sectional view of the present invention;

[0021] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a top view of the magnetic pusher block distribution of this utility model.

[0023] Explanation of the labels in the diagram:

[0024] 1. Fixed mold; 2. Moving mold; 3. Unloading inner mold; 31. Frame mold; 32. Pushing mold; 33. Unloading mold; 34. Magnetic push block; 35. Electromagnetic plate; 36. High temperature resistant airbag; 37. Tough heat-conducting wire; 4. Injection hole; 5. Water inlet hole; 6. Cooling inner mold; 7. Oil film sheet; 8. Edge sealing plate. Detailed Implementation

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

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Example 1:

[0029] Please see Figures 1-4An automatic ejection mechanism for a stamping die includes a fixed die 1 and a moving die 2. The fixed die 1 has a fixed die groove near the end of the moving die 2, and the moving die 2 has a moving die groove near the end of the fixed die 1. An ejection inner die 3 is fixedly connected to the inner end of the moving die groove. An injection hole 4 is provided at the end of the fixed die 1 away from the moving die 2. Water inlets 5 are provided at the outer ends of both the fixed die 1 and the moving die 2. A water injection hole is provided at the end of the moving die 2 away from the fixed die 1. A sealing plate 8 is fixedly connected to the end of the fixed die 1 near the moving die 2. A retaining frame groove is provided at the end of the moving die 2 near the fixed die 1. The fixed die groove of the fixed die 1 and the moving die groove of the moving die 2 cooperate to provide a stable cavity for workpiece forming. An ejection inner die 3 is fixedly connected within the moving die groove. The inner mold 3 enables automatic material ejection, avoiding the drawbacks of traditional ejection structures that require external power. The injection hole 4 of the fixed mold 1 ensures accurate injection of molding material into the cavity, guaranteeing feeding stability. The water inlet holes 5 at the outer ends of the fixed mold 1 and the moving mold 2 provide channels for overall mold cooling, preventing overheating during stamping. The water injection hole of the moving mold 2 creates conditions for localized cooling of the inner mold 3 during subsequent material ejection. The sealing plate 8 of the fixed mold 1 and the retaining groove of the moving mold 2 are compatible, effectively sealing the cavity when the mold is closed, preventing molding material overflow or coolant leakage. The overall structure provides basic support for the entire process of molding, cooling, and material ejection, improving the stability and reliability of mold operation.

[0030] The ejection inner mold 3 includes a frame mold 31, which is fixedly connected to the inner end of the moving mold groove. A pusher mold 32 is fixedly connected to the inner end of the frame mold 31. A reserved cavity is opened between the frame mold 31 and the pusher mold 32, and the two reserved cavities are connected. The water injection hole is connected to the reserved cavity. The frame mold 31 in the ejection inner mold 3 is fixed in the moving mold groove, which not only provides a reference for the edge forming of the workpiece, but also restricts the offset of the workpiece during the ejection process. The pusher mold 32 at the inner end of the frame mold 31 can serve as the execution carrier for the ejection action, laying the foundation for the subsequent pushing of the workpiece away. The reserved cavity connected between the frame mold 31 and the pusher mold 32, together with the water injection hole of the moving mold 2, can accurately introduce coolant into the periphery of the cavity, directly and efficiently cooling the formed workpiece locally. Compared with the traditional mold overall cooling method, it can avoid warping and cracking defects caused by uneven cooling of the workpiece. At the same time, the coolant circulates in the reserved cavity, which can continuously remove heat, ensure the mold temperature is stable during the stamping process, and extend the mold service life.

[0031] The ejection inner mold 3 also includes an auxiliary ejection mold 33, which is fixedly connected to the end of the pusher mold 32 near the fixed mold 1. Multiple matrix-distributed magnetic push blocks 34 are embedded in the end of the auxiliary ejection mold 33 away from the pusher mold 32. An electromagnetic plate 35 is embedded in the inner end of the moving mold groove. The auxiliary ejection mold 33, added to the ejection inner mold 3, is fixed to the end of the pusher mold 32 near the fixed mold 1 and can fit tightly against the bottom of the workpiece, providing a uniform force surface for ejection. The matrix-distributed magnetic push blocks 34 on the auxiliary ejection mold 33, in conjunction with the electromagnetic plate 35 in the moving mold groove, when the electromagnetic plate is activated... When plate 35 is activated and magnetized, it can generate a uniform repulsive force on magnetic push block 34, causing magnetic push block 34 to bulge out and squeeze the workpiece synchronously, quickly releasing the local adhesion between the workpiece and the ejection die 33. Compared with traditional mechanical ejector pin ejection, it can avoid workpiece deformation caused by single-point force. The matrix distribution setting ensures uniform force on the bottom of the workpiece, which is especially suitable for thin-walled or irregularly shaped workpieces. The flatness deviation of the workpiece after ejection can be controlled within 0.02mm. At the same time, the electromagnetic drive has a fast response speed and can be precisely synchronized with the stamping stroke, improving ejection efficiency.

[0032] The ejection inner mold 3 also includes a high-temperature resistant airbag 36, which is fixedly connected between the pusher mold 32 and the electromagnetic plate 35. Through the high-temperature resistant airbag 36 fixed between the pusher mold 32 and the electromagnetic plate 35 in the ejection inner mold 3, it can generate a flexible and uniform thrust by inflating, pushing the pusher mold 32 towards the fixed mold 1, thereby causing the workpiece to detach from the inner wall of the frame mold 31. This effectively solves the problem of the workpiece easily getting stuck on the inner wall of the frame mold 31 in the traditional ejection structure. The flexible thrust of the high-temperature resistant airbag 36 can avoid scratching the workpiece surface caused by rigid push, which is especially suitable for workpieces with high surface precision requirements. At the same time, its high-temperature resistance can withstand the stamping temperature of 200-300℃, which can adapt to the working environment of the mold and avoid the failure of the airbag due to high temperature. Combined with the local de-adhesion effect of the magnetic push block 34, it forms a dual ejection guarantee of overall push and local de-adhesion, improving the ejection success rate.

[0033] The ejection mold 3 also includes multiple flexible heat-conducting wires 37, which are fixedly connected between multiple magnetic push blocks 34. Through the flexible heat-conducting wires 37 connecting the multiple magnetic push blocks 34 in the ejection mold 3, the wires 37, due to their own flexibility, will not break due to deformation when the magnetic push blocks 34 slide and bulge under electromagnetic repulsion, thus not affecting the smoothness of the ejection action. At the same time, the local heat absorbed by a single magnetic push block 34 can be evenly conducted to other magnetic push blocks 34, so that the bottom of the workpiece is heated evenly, avoiding the workpiece cooling too fast or too slow due to temperature differences between the magnetic push blocks 34, thereby reducing internal stress concentration and improving the dimensional accuracy of the workpiece. In addition, the flexible heat-conducting wires 37 can also play a positioning and constraint role for the magnetic push blocks 34, preventing them from shifting during long-term stamping and ensuring the consistency of the ejection action.

[0034] A cooling inner mold 6 is fixedly connected to the inner end of the fixed mold groove. An oil film sheet 7 is fixedly connected to the inner wall of the cooling inner mold 6. The cooling inner mold 6 fixed in the fixed mold groove can form a bidirectional cooling system with the ejection inner mold 3, which conducts the heat of the ejection inner mold 3 to the fixed mold side, balances the overall temperature field of the workpiece, and avoids deformation of the workpiece due to excessive temperature difference between the fixed mold side and the moving mold side. It is especially suitable for thick-walled workpieces and improves the uniformity of workpiece cooling. The oil film sheet 7 fixed to the inner wall of the cooling inner mold 6 has low surface energy characteristics, which can significantly reduce the adhesion between the workpiece and the cooling inner mold 6, reduce the risk of workpiece sticking on the fixed mold side, and achieve the synergistic effect of fixed mold anti-sticking and moving mold ejection, further improving the smoothness of demolding. At the same time, the oil film sheet 7 can also reduce the friction between the workpiece and the cooling inner mold 6, avoid scratches on the workpiece surface, and ensure the appearance quality of the workpiece.

[0035] It should be noted that the specific installation method, circuit connection method, and control method of the electromagnetic plate 35 in this utility model are all conventional settings, and will not be described in detail in this utility model.

[0036] Working principle:

[0037] During the mold closing stage, the fixed mold 1 and the moving mold 2 approach and close together. The sealing plate 8 of the fixed mold 1 is precisely engaged in the retaining groove of the moving mold 2, achieving a cavity seal formed by the fixed mold groove and the moving mold groove. Subsequently, the molding material is precisely injected into the sealed cavity through the injection hole 4 at the end of the fixed mold 1 away from the moving mold 2, providing a stable space for workpiece molding. During the cooling stage, coolant is introduced through the water inlet holes 5 at the outer ends of the fixed mold 1 and the moving mold 2 to cool the entire mold, preventing the mold from overheating during the stamping process and affecting the workpiece forming quality. Then, the coolant is introduced through the water inlet holes 5 at the outer ends of the fixed mold 1 and the moving mold 2. The water injection hole at one end injects coolant into the pre-reserved cavity connecting the outer frame mold 31 and the pusher mold 32 in the ejector inner mold 3, providing localized and efficient cooling for the workpiece around the cavity. Simultaneously, the flexible heat-conducting wire 37 connecting multiple magnetic push blocks 34 in the ejector inner mold 3 evenly conducts the localized heat absorbed by a single magnetic push block 34 to all magnetic push blocks 34, ensuring uniform cooling of the workpiece bottom. The cooling inner mold 6 in the fixed mold groove, in conjunction with the ejector inner mold 3, forms a bidirectional cooling system, further balancing the overall temperature field of the workpiece. The oil film 7 on the wall, with its low surface energy, reduces the risk of adhesion between the workpiece and the fixed mold side in advance. During the mold opening and unloading stage, the moving mold 2 begins to move away from the fixed mold 1, first activating the electromagnetic plate 35 embedded in the moving mold groove. After the electromagnetic plate 35 is magnetized, it generates a uniform repulsive force on the magnetic push blocks 34 distributed in a matrix on the unloading mold 33, causing the magnetic push blocks 34 to bulge out and squeeze the workpiece synchronously, quickly releasing the local adhesion between the workpiece and the unloading mold 33. Then, the high-temperature resistant airbag 36 fixed between the push mold 32 and the electromagnetic plate 35... Inflating and expanding generates a flexible and uniform thrust that pushes the pusher mold 32 toward the fixed mold 1. The pusher mold 32, along with the fixed ejector mold 33 and magnetic pusher block 34, works together to smoothly push the workpiece out from the inner wall of the side mold 31. During this process, the oil film 7 on the inner wall of the cooling inner mold 6 further reduces the adhesion between the workpiece and the fixed mold side, preventing the workpiece from sticking to the fixed mold 1. Finally, the workpiece completely detaches from the mold, completing a complete work cycle of mold closing and sealing, feeding and forming, bidirectional cooling, electromagnetic debonding, and airbag-assisted ejection.

[0038] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. An automatic ejection mechanism for a stamping die, comprising a fixed die (1) and a moving die (2), characterized in that: The fixed mold (1) has a fixed mold groove at one end near the moving mold (2), and the moving mold (2) has a moving mold groove at one end near the fixed mold (1). The inner end of the moving mold groove is fixedly connected to the ejector inner mold (3). The fixed mold (1) has an injection hole (4) at one end away from the moving mold (2). The outer ends of both the fixed mold (1) and the moving mold (2) have water inlet holes (5). The moving mold (2) has a water injection hole at one end away from the fixed mold (1). The fixed mold (1) has an edge sealing plate (8) fixedly connected to one end near the moving mold (2). The moving mold (2) has a frame groove at one end near the fixed mold (1).

2. The automatic unloading mechanism for a stamping die according to claim 1, characterized in that: The ejection inner mold (3) includes a side frame mold (31), which is fixedly connected to the inner end of the moving mold groove. A pusher mold (32) is fixedly connected to the inner end of the side frame mold (31). A reserved cavity is opened between the side frame mold (31) and the pusher mold (32), and a pair of reserved cavities are connected. The water injection hole is connected to the reserved cavity.

3. The automatic unloading mechanism for a stamping die according to claim 2, characterized in that: The ejection inner mold (3) also includes an ejection aid mold (33), which is fixedly connected to the pusher mold (32) at the end near the fixed mold (1). The ejection aid mold (33) at the end away from the pusher mold (32) is inlaid with a plurality of matrix-distributed magnetic push blocks (34), and an electromagnetic plate (35) is inlaid in the inner end of the moving mold groove.

4. The automatic unloading mechanism for a stamping die according to claim 3, characterized in that: The ejector inner mold (3) also includes a high-temperature resistant airbag (36), which is fixedly connected between the push mold (32) and the electromagnetic plate (35).

5. The automatic unloading mechanism for a stamping die according to claim 2, characterized in that: The ejector inner mold (3) also includes multiple flexible heat-conducting wires (37), and the multiple flexible heat-conducting wires (37) are respectively fixedly connected between multiple magnetic push blocks (34).

6. The automatic unloading mechanism for a stamping die according to claim 1, characterized in that: A cooling inner mold (6) is fixedly connected to the inner end of the fixed mold groove, and an oil film sheet (7) is fixedly connected to the inner wall of the cooling inner mold (6).

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