Vacuumizing die-casting die

Abstract

The invention relates to the field of automobile part manufacturing, and discloses a vacuumizing die-casting die, at least one vacuumizing structure used for vacuumizing a die cavity is arranged on a fixed die core, at least one circle of sealing groove is formed in the outer side face of an insert in a surrounding mode, and the sealing groove is filled with sealant or a sealing ring. The inner side wall of the concave cavity and the insert are sealed, and the fit clearance between the insert and the movable mold core is sealed through the sealant / sealing ring, so that the air tightness of the mold cavity is ensured, the mold cavity is vacuumized, air and gas in the mold cavity are exhausted, and the mold cavity can be smoothly filled with molten metal in the filling process; and the defects of air holes, inclusions and the like are avoided, so that the quality and compactness of the front wall cross beam are improved.

Description

[0001] This application is a divisional application of the patent application with patent application number "202310943865.0", application date "July 28, 2023", and name "Die-casting mold for integrated front crossbeam". Technical Field

[0002] The invention relates to the field of automobile parts manufacturing, in particular to a die-casting mold for an integrated front wall cross beam. Background Art

[0003] Due to the complex structure of the front cross beam, it is usually processed and formed by die casting. During the casting process, bubbles will be generated when the molten metal fills the mold cavity. For thin-walled structural parts, bubbles are more likely to be trapped inside the metal during the casting process, resulting in defects such as pores and inclusions, which in turn affect the subsequent heat treatment of the product. Therefore, it is necessary to evacuate the mold cavity before injecting molten aluminum. The purpose of evacuation is to remove the air and gas in the mold cavity before injecting the molten metal, so as to ensure that the molten metal can smoothly fill the mold cavity during the filling process, and avoid defects such as pores and inclusions, so as to improve the quality and density of the casting.

[0004] However, due to the complex structure of the product, local parts are often damaged or worn. Accordingly, replaceable inserts are set on the movable core of some die-casting molds. Due to the manufacturing tolerances between the inserts and the movable core, there will inevitably be a gap between the inserts and the movable core, affecting the air tightness, thereby causing air leakage in the core cavity when vacuuming.

[0005] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a die-casting mold for an integrated front wall cross beam, aiming to solve the technical problem of air leakage occurring at the embedding point between the insert and the movable mold core.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The die-casting mold for an integrated front panel cross beam comprises a movable mold frame, a fixed mold frame, a movable mold core arranged on the movable mold frame, a fixed mold core arranged on the fixed mold frame, a left core-pulling mechanism and a right core-pulling mechanism for core-pulling the side portion of the front panel cross beam, and two top core-pulling mechanisms for core-pulling the top portion of the rear frame; the fixed mold core, the movable mold core, the left core-pulling block of the left core-pulling mechanism, the right core-pulling block of the right core-pulling mechanism and the top core-pulling block of the top core-pulling mechanism are combined to form a mold cavity, and a casting port is arranged on the fixed mold core; the fixed mold core is provided with at least one vacuuming structure for vacuuming the mold cavity, the movable mold core is provided with a concave cavity and an insert is embedded in the concave cavity, the outer side surface of the insert is surrounded by at least one circle of sealing grooves, and the sealing grooves are filled with sealant or a sealing ring so that the inner side wall of the concave cavity is sealed with the insert.

[0009] As a further improvement of the above technical solution, the movable mold core includes a first sub-mold core and a second sub-mold core which are spliced ​​together on the left and right, the concave cavity includes a left chamber arranged in the first sub-mold core and a right chamber arranged in the second sub-mold core, and the insert connects the first sub-mold core and the second sub-mold core.

[0010] As a further improvement of the above technical solution, the vacuum extraction structure includes a positioning insert fixed on the fixed mold core, an exhaust head cooperating with the positioning insert, and a locking plate connecting the positioning insert and the exhaust head. The positioning insert, the exhaust head and the fixed mold core are provided with a vacuum extraction air path connected to the mold cavity.

[0011] As a further improvement of the above technical solution, the top core pulling mechanism includes a slider slidably connected to the movable mold frame, a top core pulling block fixedly connected to one side of the slider, a top plate fixedly connected to the other side of the slider, and a core pulling drive cylinder arranged on the top plate and drivingly connected to the top surface of the movable mold frame.

[0012] As a further improvement of the above technical solution, a plurality of mounting holes extending in the front-to-back direction are provided on the movable mold core, and the mounting holes are arranged at intervals in the left-to-right direction. An atomizing nozzle is installed in each mounting hole, and the spray end of the atomizing nozzle faces the top core pulling block and is used to spray the release agent on the back of the top core pulling block. The input end of each of the atomizing nozzles is connected to a conduit extending in the front-to-back direction, and a joint is provided at one end of the conduit, and each conduit is connected to the joint through a corner two-way.

[0013] As a further improvement of the above technical solution, at least one fixed mold ejection mechanism is arranged on the fixed mold frame, and the fixed mold ejection mechanism includes a fixed plate, a one-way cylinder arranged on the fixed plate, a pressure plate drivingly connected to the piston rod end of the one-way cylinder, a plurality of ejectors arranged on the pressure plate, a spring assembly arranged on the fixed plate and used to push the pressure plate to move toward the mold cavity, and a return rod fixed on the pressure plate, and the one-way cylinder is used to drive the pressure plate and the ejector to move so that the ejector can pass through the fixed mold and extend into the mold cavity.

[0014] As a further improvement of the above technical solution, the fixed plate includes a mounting plate and a cover plate arranged behind the mounting plate, the cover plate is fixed on the fixed mold frame, the mounting plate is provided with a plurality of tightening screw holes, the cover plate is provided with through holes which are the same in number and correspond one to one with the tightening screw holes, the cover plate and the mounting plate are connected by tightening screws passing through the through holes and cooperating with the tightening screw holes; the one-way oil cylinder is arranged on the pressure plate.

[0015] As a further improvement of the above technical solution, a limiting column for limiting the distance between the mounting plate and the cover plate is provided on the back side of the mounting plate.

[0016] As a further improvement of the above technical solution, two one-way oil cylinders are provided, and the two one-way oil cylinders are arranged up and down on the mounting plate.

[0017] Beneficial effects of the present invention: Compared with the prior art, the die-casting mold of the integrated front dash cross beam provided by the present invention arranges sealant or a sealing ring around the outer side surface of the insert, and seals the fitting gap between the insert and the movable mold core by the sealant / sealing ring, thereby ensuring the airtightness of the mold cavity, and then ensuring that the mold cavity is vacuumed, and the air and gas in the mold cavity are removed to ensure that the molten metal can smoothly fill the mold cavity during the filling process, and avoid the generation of defects such as pores and inclusions, so as to improve the quality and density of the front dash cross beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional view of the die-casting mold for the integrated front cross member.

[0019] Figure 2 This is a schematic diagram of the structure in which the atomizing nozzle is arranged on the moving mold core.

[0020] Figure 3 for Figure 2 A partial enlarged view of the middle L area.

[0021] Figure 4 This is a schematic diagram of the top core block and the front crossbeam after demoulding.

[0022] Figure 5 It is a three-dimensional diagram of the movable mold core.

[0023] Figure 6 A three-dimensional diagram of the insert.

[0024] Figure 7 This is a schematic diagram of the structure in which the vacuum pumping structure is arranged on the fixed mold core.

[0025] Figure 8 It is a structural schematic diagram of the vacuum structure.

[0026] Fig. 9Schematic diagram of the structure of the top core block and the front crossbeam Figure 1 .

[0027] Fig.10 Schematic diagram of the structure of the top core block and the front crossbeam Figure 2 .

[0028] Fig.11 This is a schematic diagram of the structure behind the hidden cover of the fixed mold ejection mechanism.

[0029] Fig.12 This is a schematic diagram of the structure of the fixed mold ejection mechanism after the fixed plate is hidden.

[0030] Fig.13 This is a schematic diagram of the structure of the ejector pin ejecting the front wall crossbeam.

[0031] Description of the main component symbols: 11-movable mold frame, 12-fixed mold frame, 13-movable mold core, 131-first sub-mold core, 132-second sub-mold core, 14-fixed mold core, 21-left core pulling mechanism, 22-right core pulling mechanism, 3-top core pulling mechanism, 31-slider, 32-top plate, 33-top core pulling block, 34-core pulling drive cylinder, 4-vacuum structure, 41-positioning insert, 42-vacuum head, 43-locking piece, 50-concave cavity, 501-left chamber, 502-right chamber, 5-insert, 51-sealing groove, 60-mounting hole, 61-nozzle, 62-conduit, 63-connector, 64-corner two-way, 7-fixed mold ejection mechanism, 71-fixed plate, 711-mounting plate, 712-cover plate, 713-through hole, 714-tightening screw hole, 72-one-way cylinder, 73-pressure plate, 731-sliding hole, 74-throw pin, 75-spring assembly, 751-positioning column, 752-butterfly spring, 76-return rod, 77-limit column, 8-front wall cross beam. DETAILED DESCRIPTION

[0032] The present invention provides a die-casting mold for an integrated front wall cross beam. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0033] See also Figure 1-Figure 13The present invention provides a die-casting mold for an integrated front wall cross beam, comprising a movable die frame 11, a fixed die frame 12, a movable die core 13 arranged on the movable die frame 11, a fixed die core 14 arranged on the fixed die frame 12, a left core-pulling mechanism 21 and a right core-pulling mechanism 22 for core-pulling molding the side portion of the front wall cross beam 8, and two top core-pulling mechanisms 3 for core-pulling molding the top portion of the rear frame; the fixed die core 14, the movable die core 13, the left core-pulling block of the left core-pulling mechanism 21, the right core-pulling block of the right core-pulling mechanism 22 The block and the top core pulling block 33 of the top core pulling mechanism 3 are combined to form a mold cavity, and the casting port is arranged on the fixed mold core 14; the fixed mold core 14 is provided with at least one vacuuming structure 4 for evacuating the mold cavity, the movable mold core 13 is provided with a concave cavity 50 and an insert 5 is embedded in the concave cavity 50, and the outer side surface of the insert 5 is surrounded by at least one circle of sealing grooves 51, and the sealing grooves 51 are filled with sealant or sealing rings, so that the inner wall of the concave cavity 50 and the insert 5 form a seal.

[0034] Compared with the prior art, the die-casting mold of the front panel cross beam 8 provided by the present invention is provided with a sealant or a sealing ring around the outer side surface of the insert 5, and the fitting gap between the insert 5 and the movable mold core 13 is sealed by the sealant / sealing ring, thereby ensuring the airtightness of the mold cavity, and then ensuring that the mold cavity is evacuated, and the air and gas in the mold cavity are removed to ensure that the molten metal can smoothly fill the mold cavity during the filling process, and avoid the generation of defects such as pores and inclusions, so as to improve the quality and density of the front panel cross beam.

[0035] When the shape of the front cross beam 8 is special, if deep ribs need to be formed with the help of the deep rib grooves on the side of the insert 5, it is easy to cause adhesion between the movable mold core 13 and the front cross beam 8 due to reasons such as poor flow of aluminum liquid, making it difficult to separate the movable mold core 13 from the front cross beam 8 and unable to demold smoothly: In order to facilitate the subsequent removal of the front cross beam 8 and avoid damage to the movable mold core 13 and the insert 5, the movable mold core 13 is set to a split structure, the movable mold core 13 includes a first sub-mold core 131 and a second sub-mold core 132 that are spliced ​​together on the left and right, the concave cavity 50 includes a left chamber 501 set in the first sub-mold core 131 and a right chamber 502 set in the second sub-mold core 132, that is, the concave cavity 50 is set in the middle position of the movable mold core 13, and the insert 5 connects the first sub-mold core 131 and the second sub-mold core 132. When the front cross beam 8 cannot be demolded, the first sub-mold core 131 and the second sub-mold core 132 are separated. On the one hand, this can solve the adhesion between the front cross beam 8 and the first sub-mold core 131 and the second sub-mold core 132. On the other hand, the side of the insert 5 can be exposed, which makes it easier to separate the front cross beam 8 from the insert 5.

[0036] For further information, see Figure 7 and Figure 8The vacuum pumping structure 4 includes a positioning insert 41 fixed on the fixed mold core 14, an exhaust head 42 matched with the positioning insert 41, and a locking piece 43 connecting the positioning insert 41 and the exhaust head 42. The positioning insert 41, the exhaust head 42 and the fixed mold core 14 are provided with a vacuum pumping air path connected to the mold cavity. Specifically, the positioning insert 41 is connected with an exhaust pipe, and one end of the exhaust pipe is connected to a vacuum pump. When the vacuum pump is working, the mold cavity can be vacuumed. The number of vacuum pumping structures 4 is specifically determined according to the set vacuum pumping time. The more vacuum pumping structures 4 are, the shorter the vacuum pumping time is.

[0037] Preferably, see Figure 1 and Figure 4 The top core pulling mechanism 3 includes a slider 31 slidably connected to the movable mold frame 11, a top core pulling block 33 fixedly connected to one side of the slider 31, a top plate 32 fixedly connected to the other side of the slider 31, and a core pulling driving cylinder 34 disposed on the top plate 32 and drivingly connected to the top surface of the movable mold frame 11. When the piston rod of the core pulling driving cylinder 34 is extended or retracted, the core pulling driving cylinder 34, the top plate 32, the slider 31, and the top core pulling block 33 will move together as a whole.

[0038] See also Fig. 9 and Fig.10 Due to the special shape of the front enclosure cross beam 8, the front half of its top is a low and flat structure, while the rear half is a tall and multi-ribbed structure. Accordingly, the front half of the top core pulling block 33 needs to be set as a wide and thick structure, while the rear half of the top core pulling block 33 needs to be set as a hollow structure. Therefore, when the spraying mechanism located in front of the mold cavity sprays the release agent, it is difficult to spray the release agent on the back and bottom surface of the top core pulling block 33 due to the obstruction of the front half of the top core pulling block 33, which not only affects the demolding of the front enclosure cross beam 8, but also affects the surface quality of the rear half of the top of the front enclosure cross beam 8.

[0039] Therefore, please refer to Figure 2 and Figure 3 The movable mold core 13 is provided with a plurality of mounting holes 60 extending in the front-to-back direction, and an atomizing nozzle 61 is installed in each mounting hole 60. The spray end of the atomizing nozzle 61 faces the top core pulling block 33 and is used to spray a release agent on the back of the top core pulling block 33. The input end of each atomizing nozzle 61 is connected to a conduit 62 extending in the front-to-back direction, and one end of the conduit 62 is provided with a joint 63, and each conduit 62 is connected to the joint 63 through a corner two-way 64.

[0040] In fact, a spray pump is used to pump the release agent, and the output end of the spray pump is connected to the main pipe. The branch pipes on the main pipe are respectively connected to the corresponding joints 63. When the core-pulling spray release agent structure sprays the release agent, the top core-pulling block 33 is in a non-molding state, and the release agent enters the conduit 62 and is sprayed from the atomizing nozzle 61, and the release agent is atomized and attached to the back and bottom of the top core-pulling block 33, thereby ensuring that the back and bottom of the top core-pulling block 33 are lubricated by the release agent, and then the demolding is smooth and the front panel cross beam 8 is of excellent quality.

[0041] Since the front wall cross beam 8 extends transversely, the mounting holes 60 are arranged at intervals in the left-right direction. In this embodiment, the nozzles 61 are provided with 5, which can better ensure that the back and bottom of the core pulling block are evenly and fully lubricated by the release agent, reducing the spraying dead angle.

[0042] It is understood that the atomizing nozzle 61 is a nozzle 61 with an adjustable spray angle. By rotating or adjusting the control component on the atomizing nozzle 61, the direction in which the atomized release agent is sprayed by the atomizing nozzle 61 can be changed, so that the atomized spray can be directed to a specific core pull surface area as needed to ensure that the back of the core pull is evenly sprayed with the release agent.

[0043] Since the clamping force between the front panel cross beam 8 and the fixed mold core 14 is very large, there is a large pulling force on the fixed mold core 14 when the mold is opened. In this way, the front panel cross beam 8 will be pulled outward during the opening process of the die-casting mold, thereby affecting the final size change of the front panel cross beam 8, and even tearing the front panel cross beam 8, thereby affecting the mold life and product qualification rate, and increasing the cost of mold maintenance.

[0044] Therefore, please refer to Figure 1 , Figure 11-13 At least one fixed mold ejection mechanism 7 is arranged on the fixed mold frame 12, and the fixed mold ejection mechanism 7 includes a fixed plate 71, a one-way cylinder 72 arranged on the fixed plate 71, a pressure plate 73 drivingly connected to the piston rod end of the one-way cylinder 72, a plurality of ejector pins 74 arranged on the pressure plate 73, a spring assembly 75 arranged on the fixed plate 71 and used to push the pressure plate 73 to move toward the mold cavity, and a return rod 76 fixed on the pressure plate 73. The one-way cylinder 72 is used to drive the pressure plate 73 and the ejector pin 74 to move, so that the ejector pin 74 can pass through the fixed mold core 14 and extend into the mold cavity.

[0045] When the fixed mold core 14 and the movable mold core 13 are molded together, under the action of the movable mold core 13, the return rod 76 is retracted into the fixed mold core 14, and at the same time overcomes the thrust of the spring assembly 75, so that the pressure plate 73 moves away from the mold cavity to the position closest to the fixed plate 71, and the ejector pin 74 is also retracted into the fixed mold core 14. When the mold is opened, after the fixed mold core 14 moves away from the movable mold core 13, on the one hand, under the action of the spring assembly 75, the pressure plate 73 is driven to move toward the mold cavity, and on the other hand, the piston rod of the one-way oil cylinder 72 is extended, and the pressure plate 73 is driven to move toward the mold cavity. Under the joint action of the spring assembly 75 and the one-way oil cylinder 72, the ejector pin 74 has a good ejection force to eject the front wall beam 8 in the mold cavity, so that the front wall beam 8 is smoothly demolded. The fixed mold ejection structure can control the deformation of the fixed mold drawing die of the mold, reasonably control the final size change of the front wall beam 8, and improve the production qualification rate of the front wall beam 8.

[0046] It should be noted that there are multiple ejector pins 74 and they are densely arranged, so that they can act on various parts of the front wall cross beam 8 in a more balanced manner, making it easier to eject the front wall cross beam 8. There are four return rods 76 on each fixed mold ejection mechanism 7, which are arranged at the corners of the pressure plate 73 respectively, so as to drive the pressure plate 73 to reset in a more balanced manner.

[0047] In this embodiment, the one-way oil cylinder 72 can be specifically an ultra-thin split hydraulic jack, which has the advantages of flexibility of use, load-bearing capacity and precise control in a compact space. Preferably, two one-way oil cylinders 72 are provided, and the two one-way oil cylinders 72 are arranged up and down on the mounting plate 711 to provide sufficient auxiliary ejection force for the pressure plate 73.

[0048] Specifically, the fixed plate 71 includes a mounting plate 711 and a cover plate 712 arranged behind the mounting plate 711. The cover plate 712 is fixed to the fixed mold frame 12 by screws. The one-way cylinder 72 is arranged on the pressure plate 73. The mounting plate 711 is provided with a plurality of tightening screw holes 714. The cover plate 712 is provided with through holes 713 which are the same in number and correspond one to one with the tightening screw holes 714. The cover plate 712 and the mounting plate 711 are connected by tightening screws passing through the through holes 713 and cooperating with the tightening screw holes 714. When the tightening screws are tightened, the cover plate 712 and the mounting plate 711 are combined to form a whole. Although the cover plate 712 and the mounting plate 711 are split structures, they are convenient for manufacturing and maintenance to replace damaged parts.

[0049] Furthermore, in order to make the position of the mounting plate 711 adjustable, a limiting column 77 for limiting the distance between the mounting plate 711 and the cover plate 712 is provided on the back of the mounting plate 711. When the screws are tightened and locked, the mounting plate 711 and the cover plate 712 will clamp the limiting column 77 together to determine the position of the mounting plate 711. The limiting column 77 is fixed to the mounting plate 711 by screws. When the distance between the mounting plate 711 and the cover plate 712 needs to be adjusted, the limiting column 77 of different lengths can be replaced.

[0050] Preferably, the spring assembly 75 includes a positioning column 751 fixed on the mounting plate 711, a butterfly spring 752 sleeved on the positioning column 751, and the butterfly spring 752 is located between the mounting plate 711 and the pressure plate 73. The butterfly spring 752 is composed of a plurality of wave-shaped structures, and this design enables it to provide greater elastic deformation capacity when bearing weight. It can be adaptively deformed according to the size and direction of the force received, thereby maintaining a stable spring pressure.

[0051] In this embodiment, four groups of spring assemblies 75 are provided, which are respectively arranged on the corners of the pressing plate 73. The four groups of spring assemblies 75 can provide uniform and sufficient ejection force for the pressing plate 73.

[0052] Preferably, the fixed mold frame 12 is provided with a plurality of guide posts, and the pressing plate 73 is provided with a sliding hole 731 slidably connected to the guide posts. The cooperation between the guide posts and the sliding hole 731 can guide the movement of the pressing plate 73 to prevent the ejector pin 74 from being stuck due to the displacement of the pressing plate 73.

[0053] 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, rather than indicating or implying 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 limiting the present invention.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 invention can be understood according to specific circumstances.

[0055] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A vacuum die-casting mold, comprising a movable mold core and a fixed mold core; characterized in that: The fixed mold core is provided with at least one vacuum pumping structure for evacuating the mold cavity, the movable mold core is provided with a concave cavity and an insert is embedded in the concave cavity, the outer side surface of the insert is surrounded by at least one circle of sealing grooves, the sealing groove is filled with sealant or a sealing ring, so that the inner wall of the concave cavity and the insert are sealed; the movable mold core comprises a first sub-mold core and a second sub-mold core which are spliced ​​together on the left and right, the concave cavity comprises a left chamber arranged in the first sub-mold core and a right chamber arranged in the second sub-mold core, and the insert connects the first sub-mold core and the second sub-mold core; the vacuum pumping structure comprises a positioning insert fixed on the fixed mold core, an exhaust head cooperating with the positioning insert, and a locking piece connecting the positioning insert and the exhaust head, and the positioning insert, the exhaust head and the fixed mold core are provided with a vacuum pumping air path connected to the mold cavity.

2. The vacuum die-casting mold according to claim 1, characterized in that: The movable mold core is provided with a plurality of mounting holes extending in the front-to-back direction, and the mounting holes are arranged at intervals in the left-to-right direction. An atomizing nozzle is installed in each mounting hole, and the spray end of the atomizing nozzle faces the top core-pulling block and is used for spraying a release agent on the back of the top core-pulling block. The input end of each atomizing nozzle is connected to a conduit extending in the front-to-back direction, and a joint is provided at one end of the conduit, and each conduit is connected to the joint through a corner two-way.

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