A fixed die ejection structure of a die casting die

Abstract

The utility model relates to the technical field of die-casting molds, and discloses a fixed mold ejection structure of a die-casting mold, with multiple groups of elastic ejection components on the fixed mold frame, each group of elastic ejection components including guide pins, springs and sleeves, and the guide shaft of the guide pins is sleeved with springs and sleeves; the sleeve includes a cylindrical body, a transmission ring arranged at the tail of the cylindrical body in an outward convex manner, and a closed loop portion arranged at the head end of the cylindrical body, the sleeve is outside the spring, so that one end of the spring acts on the limit block, and the other end acts on the closed loop portion, the pressing plate is provided with a through hole that cooperates with the cylindrical body of the sleeve, and the transmission ring fits tightly with the back of the pressing plate. Not only the guide pins and sleeves are cleverly used to encapsulate the spring, but also the through hole space on the pressing plate is cleverly used to install the spring, so as to meet the spring selection requirements, so that the selected spring can have greater elasticity, provide stronger ejection force, and effectively solve the problem of casting ejection not being smooth or difficult to eject effectively.

Description

Technical Field

[0001] The utility model relates to the technical field of die casting moulds, in particular to a fixed mould ejection structure of a die casting mould. Background Art

[0002] Die-casting molds are often used in the production of automotive parts. Since the clamping force of the casting on the fixed mold is very large, the casting is difficult to demold. Therefore, an ejector structure is usually set on the fixed mold to assist in demolding the casting. In the existing ejector structure, the spring is generally exposed between the fixed plate and the pressure plate. The pressure plate is provided with an ejector pin. Under the action of the spring, the ejector pin on the pressure plate is pushed to move toward the fixed mold cavity, thereby ejecting the casting. When the die-casting mold is closed, the pressure plate is driven away from the fixed mold cavity, and the spring is in a compressed state. At this time, due to the width limitation of the die-casting mold, the movable range of the pressure plate relative to the fixed plate is small. Therefore, a spring with a thick structure cannot be used, resulting in limited force of the spring, which causes the casting to be ejected unsmoothly or difficult to be ejected effectively.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a fixed die ejection structure to ensure that there is sufficient installation space for the spring, so that a spring with good elastic effect can be selected.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A fixed die ejection structure of a die-casting mold comprises a fixed die frame, a fixed die core fixed on the fixed die frame, a pressure plate located behind the fixed die core and movable close to or away from the fixed die core, a plurality of ejectors arranged on the pressure plate, and a return rod fixed on the pressure plate, wherein the fixed die frame has a plurality of groups of elastic ejection components, each group of elastic ejection components comprises a guide column, a spring and a sleeve, the head of the guide column is fixed on the fixed die frame, the guide column comprises a guide shaft extending laterally and a limit block arranged at the tail of the guide shaft, a spring and a sleeve are sleeved on the guide shaft of the guide column; the sleeve comprises a cylindrical body, a transmission ring arranged at the tail of the cylindrical body in an outwardly convex manner, and a closed loop portion arranged at the head end of the cylindrical body, the sleeve is outside the spring, so that one end of the spring acts on the limit block, and the other end acts on the closed loop portion, so that the ejector can pass through the fixed die core and extend into the fixed die cavity of the fixed die core, the pressure plate is provided with a through hole matched with the cylindrical body of the sleeve, and the transmission ring is tightly fitted with the back of the pressure plate.

[0007] As a further improvement of the above technical solution, the limit block is in the shape of a round block and a groove is formed at the end connected to the guide shaft, and the tail end of the cylindrical body of the sleeve can be embedded in the groove.

[0008] As a further improvement of the above technical solution, the guide column is provided with an axially extending central through hole, and the locking screw passes through the central through hole and is threadedly connected to the fixed mold frame.

[0009] As a further improvement of the above technical solution, the spring is a disc spring.

[0010] Beneficial effects of the utility model: Compared with the prior art, the fixed mold ejection structure provided by the utility model not only cleverly utilizes the guide pin and the sleeve to encapsulate the spring, but also cleverly utilizes the through-hole space on the pressure plate to install the spring, meeting the spring selection requirements, so that the selected spring can have greater elasticity, provide stronger ejection force, effectively solve the problem of casting ejection not being smooth or difficult to eject effectively, and significantly improve the demoulding efficiency. Since the spring in the ejection structure is protected by the sleeve, direct contact and friction between the spring and the pressure plate and other components is avoided, the wear of the spring is reduced, and the risk of the spring being contaminated by impurities due to exposure is also reduced, thereby extending the service life of the spring and the entire ejection structure, which is conducive to reducing the mold maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the cooperation between the pressure plate and the elastic ejector assembly in the fixed mold ejection structure Figure 1 .

[0012] Figure 2 Schematic diagram of the cooperation between the pressure plate and the elastic ejector assembly in the fixed mold ejection structure Figure 2 .

[0013] Figure 3 This is a schematic diagram of the fixed mold ejection structure being set on the fixed mold.

[0014] Figure 4 This is an exploded view of the elastic ejector component.

[0015] Explanation of the main component symbols: 11-fixed mold frame, 12-fixed mold core, 3-elastic ejector assembly, 31-guide column, 311-guide shaft, 312-limit block, 313-groove, 314-center through hole, 32-spring, 33-sleeve, 331-cylinder, 332-transmission ring, 333-closed loop part, 4-pressure plate, 5-ejector pin, 6-return rod, 7-locking screw. DETAILED DESCRIPTION

[0016] The utility model provides a fixed die ejection structure of a die casting mold. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the protection scope of the utility model.

[0017] See also Figure 1-Figure 4The utility model provides a fixed die ejection structure of a die casting mold, comprising a fixed die frame 11, a fixed die core 12 fixed on the fixed die frame 11, a pressing plate 4 located behind the fixed die core 12 and movable close to or away from the fixed die core 12, and a plurality of ejector pins 5 arranged on the pressing plate 4, and a return rod 6 fixed on the pressing plate 4, wherein the fixed die frame 11 has a plurality of groups of elastic ejection components 3, each group of elastic ejection components 3 includes a guide column 31, a spring 32 and a sleeve 33, the head of the guide column 31 is fixed on the fixed die frame 11, and the guide column 31 is provided on the fixed die frame 11. The column 31 includes a laterally extending guide shaft 311 and a limit block 312 arranged at the tail of the guide shaft 311. A spring 32 and a sleeve 33 are sleeved on the guide shaft 311 of the guide column 31. The sleeve 33 is outside the spring 32, so that one end of the spring 32 acts on the limit block 312, and the other end acts on the sleeve 33. The sleeve 33 forms a transmission connection with the pressure plate 4, so that the ejector pin 5 can pass through the fixed mold core 12 and extend into the fixed mold cavity of the fixed mold core 12. The transmission ring 332 fits tightly against the back of the pressure plate 4.

[0018] In this embodiment, the sleeve 33 is integrally formed, and the closed loop portion 333 serves as the pressing surface of the spring 32, ensuring that the pressure of the spring 32 is evenly transmitted to the pressure plate 4, avoiding local premature fatigue damage caused by stress concentration. The pressure plate 4 is tightly matched with the transmission ring 332 of the sleeve 33. This matching method enhances the connection strength between the sleeve 33 and the pressure plate 4, ensuring that during the ejection process, the thrust transmitted by the spring 32 through the closed loop portion 333 can accurately and stably act on the pressure plate 4, preventing relative sliding between the two, and ensuring efficient and consistent ejection.

[0019] When the die-casting mold is closed, the return rod 6, under the action of the movable mold, moves the pressing plate 4 away from the fixed mold core 12. At this time, the guide shaft 311 of the guide pillar 31 serves as a supporting axis, allowing the pressing plate 4 to move smoothly along the guide shaft 311. At the same time, the sleeve 33 moves with the pressing plate 4, and the spring 32 is compressed due to the retreat of the pressing plate 4, with one end of the spring abutting against the limit block 312 and the other end acting on the sleeve 33 to store elastic potential energy.

[0020] When the die casting is completed and the mold needs to be opened, the fixed mold and the movable mold of the die casting mold begin to separate, and the pressing plate 4 moves forward under the drive of the elastic ejection assembly 3. Specifically, the compressed spring 32 releases the stored elastic potential energy and transmits the thrust to the pressing plate 4 through the sleeve 33. Under the action of the spring 32, the pressing plate 4 quickly approaches the fixed mold core 12 along the guide shaft 311 of the guide column 31, and then drives the ejector 5 fixed thereon to move forward synchronously. The ejector 5 passes through the fixed mold core 12 and accurately extends into the fixed mold cavity of the fixed mold core 12, exerting an ejection force on the casting, so that the casting can be smoothly ejected from the cavity.

[0021] Compared with the prior art, the fixed mold ejection structure provided by the utility model not only cleverly utilizes the guide column 31 and the sleeve 33 to encapsulate the spring 32, but also cleverly utilizes the through-hole space on the pressure plate 4 to install the spring 32, so as to meet the selection requirements of the spring 32, so that the selected spring 32 can have a greater elastic force, provide a stronger ejection force, effectively solve the problem of the casting being ejected unsmoothly or difficult to eject effectively, and significantly improve the demoulding efficiency. Since the spring 32 in the ejection structure is protected by the sleeve 33, direct contact and friction between the spring 32 and the pressure plate 4 and other components is avoided, the wear of the spring 32 is reduced, and the risk of the spring 32 being contaminated by impurities due to exposure is also reduced, thereby extending the service life of the spring 32 and the entire ejection structure, which is conducive to reducing the mold maintenance cost.

[0022] Furthermore, the stop block 312 is in the shape of a round block and the end connected to the guide shaft 311 forms a groove 313, and the tail end of the cylindrical body 331 of the sleeve 33 can be embedded in the groove 313. The design of the groove 313 not only strengthens the connection between the sleeve 33 and the stop block 312, but also provides a reliable positioning point for the tail end of the sleeve 33. When the spring 32 is compressed, the tail end of the sleeve 33 is embedded in the groove 313, avoiding the deviation and deformation of the spring 32 due to uneven force or lateral force, ensuring that the spring 32 is always uniformly compressed along the axial direction, maintaining its ideal elastic characteristics, and improving the ejection effect.

[0023] Furthermore, the guide column 31 is provided with an axially extending central through hole 314, and the locking screw 7 passes through the central through hole 314 and is threadedly connected to the fixed mold frame 11. The tightening action of the locking screw 7 can press the guide column 31 tightly with the fixed mold frame 11, ensuring that during the ejection process, the guide column 31 will not loosen or move due to force, thereby enhancing the overall stability of the ejection structure and ensuring the precise execution of the ejection action. The assembly and disassembly of the guide column 31 and the fixed mold frame 11 become extremely convenient. When it is necessary to replace the guide column 31, adjust the ejection force or perform mold maintenance, the guide column 31 can be easily removed by loosening the locking screw 7. Conversely, when installing, it is only necessary to align the position and tighten the locking screw 7. This assembly method greatly improves the efficiency of mold maintenance and adjustment and reduces the difficulty of operation.

[0024] Preferably, the spring 32 is a disc spring 32. Due to its unique disc-type structure, the disc spring 32 has the characteristics of low height and thin thickness. Compared with the traditional coil spring 32, under the same elastic force condition, it occupies less space. During the loading process of the disc spring 32, the layers of discs gradually contact and evenly share the load, which can provide an approximately linear elastic force output, so that the force applied to the casting during the ejection process is relatively constant, which helps to smoothly and evenly push the casting out of the cavity, reduce the deformation or damage of the casting caused by the sudden change of the ejection force, and improve the quality and yield rate of the casting.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A fixed die ejection structure of a die casting mold, comprising a fixed die frame, a fixed die core fixed on the fixed die frame, a pressing plate located behind the fixed die core and movable toward or away from the fixed die core, a plurality of ejector pins arranged on the pressing plate, and a return rod fixed on the pressing plate, characterized in that: There are multiple groups of elastic ejection components on the fixed mold frame, each group of elastic ejection components includes a guide column, a spring and a sleeve, the head of the guide column is fixed on the fixed mold frame, the guide column includes a transversely extending guide shaft and a limit block arranged at the tail of the guide shaft, and the guide shaft of the guide column is sleeved with a spring and a sleeve; the sleeve includes a cylindrical body, a transmission ring arranged at the tail of the cylindrical body in an outward convex manner, and a closed loop portion arranged at the head end of the cylindrical body, the sleeve is outside the spring, so that one end of the spring acts on the limit block, and the other end acts on the closed loop portion, so that the ejector pin can pass through the fixed mold core and extend into the fixed mold cavity of the fixed mold core, the pressure plate is provided with a through hole that cooperates with the cylindrical body of the sleeve, and the transmission ring is tightly fitted with the back of the pressure plate.

2. The fixed die ejection structure of the die-casting mold according to claim 1, characterized in that: The limiting block is in the shape of a round block and a groove is formed at the end connected to the guide shaft, and the tail end of the cylindrical body of the sleeve can be embedded in the groove.

3. The fixed die ejection structure of the die-casting mold according to claim 2, characterized in that: The guide column is provided with an axially extending central through hole, and a locking screw passes through the central through hole and is threadedly connected with the fixed die frame.

4. The fixed die ejection structure of the die-casting mold according to any one of claims 1 to 3, characterized in that: The spring is a disc spring.

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