Lightweight aluminum shell die-casting mold

Abstract

The present application relates to a kind of light-weight aluminum shell die casting die, it is related to die casting die technical field.The fixed mould body and the movable mould body are all set with mould cavity in the opposite face of fixed mould body and movable mould body, and the injection cylinder is set in the right side of movable mould body, and the top of injection cylinder is provided with feed hopper.The device utilizes one-time stripper bar, secondary stripper bar to realize step ejection to disperse demoulding load, and the rotation and axial reciprocating motion of movable ring are completed by the driving of guide rod, helical guide slot, guide rod, wave groove ring and reset spring one, and the casting package resistance is weakened;Demoulding agent is sprayed from the end of stripper bar to realize accurate lubrication through feed pipe, annular pipe and connecting hose, and the knocking structure of driving frame, wedge, knock block and reset spring two driven by push rod is vibrated to assist demoulding, so as to reduce the probability of casting deformation, improve demoulding reliability and casting yield.

Description

Technical Field

[0001] This invention relates to the field of die-casting mold technology, specifically to a lightweight aluminum shell die-casting mold. Background Technology

[0002] The high-end equipment sectors, including aerospace, new energy vehicles, and high-speed rail, are rapidly upgrading towards lightweight, high-strength, integrated, and high-reliability technologies, extensively employing non-ferrous metal casting processes to manufacture structural load-bearing shells and functional substrate components. Among these, high-strength, lightweight die-cast aluminum alloys, with their advantages of low density, high specific strength, good thermal conductivity, and one-piece molding capability, have gradually replaced traditional steel and ordinary cast aluminum components, becoming a core material for lightweight manufacturing of high-end equipment. They are widely used in aircraft airborne shells, automotive electronic control shells, and cavity components of high-speed rail equipment. These lightweight aluminum shells generally feature thin walls, large annular contours, densely packed reinforcing ribs, and high structural integration, placing extremely high demands on the forming accuracy, demolding stability, forming yield, and mold lifespan of die-casting molds. However, existing die-casting molds have the following defects in practical use:

[0003] On the one hand, the cavities of traditional molds are mostly fixed structures. After the high-strength and tough aluminum alloy shell is cooled and formed, the casting will shrink and fit tightly against the inner wall of the cavity, which will generate a large clamping force and a certain degree of interface adsorption. If only ordinary straight ejection is used for demolding, thin-walled shell workpieces are more prone to quality problems such as tearing, warping, or end face dents. On the other hand, many demolding mechanisms directly adopt the form of rigid ejection, lacking relevant designs for pre-loosening and stress release. When processing ring-shaped shell parts, the circumferential clamping force is difficult to be effectively released, and the workpiece is not subjected to uniform force during demolding. The casting may have micro-cracks, elliptical deformation, etc.

[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a lightweight aluminum housing die-casting mold to solve the problems mentioned in the background. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a lightweight aluminum shell die-casting mold, comprising a fixed mold body and a moving mold body, wherein mold cavities are provided on the opposite surfaces of the fixed mold body and the moving mold body, and an injection cylinder is fixedly provided on the right side of the moving mold body, wherein a feed hopper is provided on the top of the injection cylinder, and positioning rods are fixedly installed at equal angles on the four sides of the left side of the moving mold body, and positioning grooves are provided at equal angles on the four sides of the right side of the fixed mold body;

[0007] It also includes two brackets, which are fixedly installed on the upper and lower left sides of the fixed mold body by bolts, and a push rod is slidably connected between the two brackets. A force-releasing mold assembly is provided inside the fixed mold body. Demolding assemblies are provided on the left, outer and inner sides of the fixed mold body. The demolding assembly includes a primary demolding rod, which is fixedly installed on the right side of the push rod by bolts. A push ring is fixed on the right side of the push rod at the position of the primary demolding rod. A secondary demolding rod is equally angledly connected through the right side inside the fixed mold body.

[0008] The end of the primary demolding rod away from the push rod extends into the interior of the fixed mold body, and the primary demolding rod and the multiple secondary demolding rods are all limited sliding connections with the fixed mold body. The positions of the multiple secondary demolding rods correspond to those of the push ring.

[0009] Preferably, the primary demolding rod and the plurality of secondary demolding rods are hollow inside, and holes are opened at equal angles on the outer side of the right end of the primary demolding rod and the plurality of secondary demolding rods.

[0010] Preferably, an annular tube is fixedly connected to the left side of the fixed mold body outside the multiple secondary demolding rods, and the annular tube is connected to the multiple secondary demolding rods through multiple connecting hoses. The primary demolding rods and the annular tube are connected to the external demolding machine supply device through the feed pipe.

[0011] Preferably, a drive frame is provided on the outer side of the fixed mold body, and wedge blocks are fixedly connected to the inner side of the drive frame at equal angles. Support frames are fixed to the outer surface of the fixed mold body at equal intervals by bolts. A striking block is slidably connected through the inside of the support frame, and a second return spring is provided on the outer side of the striking block. The two ends of the second return spring are fixedly connected to the outer side of the striking block and the inner wall of the support frame, respectively.

[0012] Preferably, the drive frame is slidably connected to the outside of the fixed mold body, and the left side of the drive frame is fixedly connected to the horizontal end of the push rod by bolts, and the inclined surface of the wedge block is in contact with the end of the striking block.

[0013] Preferably, the force-relieving mold assembly includes a movable ring, which is rotatably connected to the mold cavity inside the fixed mold body, and a spiral guide groove is provided on the outer side of the movable ring. A guide rod is provided inside the fixed mold body above the movable ring.

[0014] Preferably, one end of the guide rod is fixed to the outside of the secondary demolding rod by bolts, and the other end of the guide rod is embedded in the spiral guide groove.

[0015] Preferably, a limiting ring is sleeved on the outer side of the left end of the movable ring, and multiple balls are assembled between the limiting ring and the movable ring. A guide rod is connected to the left end of the movable ring by an equal-angle bolt. A wave groove ring is fixedly connected to the left end of the movable ring inside the fixed mold body. A return spring is installed between the left end of the limiting ring and the inner wall of the fixed mold body.

[0016] Preferably, the limiting ring is slidably connected inside the fixed mold body, the movable ring forms a rolling engagement with the limiting ring through multiple balls, and the ends of the multiple guide rods are in contact with the wave groove of the wave groove ring.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This invention, through a step-by-step ejection structure with a primary ejection rod and a secondary ejection rod in coordination, allows the middle part and the surrounding parts of the workpiece to bear the ejection force successively during the demolding process. This can disperse the load during the demolding stage to a certain extent, avoid stress concentration, improve the stress conditions during demolding of high-strength, tough, and lightweight aluminum shells, reduce the occurrence of tearing and warping deformation in castings, and help improve the forming quality of shell castings.

[0019] 2. In this invention, the release agent can be delivered to the interior of the primary and secondary release rods via the feed pipe, annular pipe, and connecting hose, and then directly sprayed onto the corresponding mating position of the workpiece through the orifice opened at the end of the rod. Compared with the traditional external spraying method of mold, this supply method allows the lubricating medium to act more accurately on the demolding contact area of ​​the casting, and the lubrication effect can be better exerted. It can also alleviate the problems of mold sticking and carbon accumulation in continuous production to a certain extent.

[0020] 3. In this invention, the movement of the push rod drives the drive frame and the wedge block to move, and together with the striking block and the return spring, a mechanical reciprocating striking structure is formed. The vibration generated by the striking can further assist the casting in releasing stress by loosening the mold. It works in conjunction with the mold loosening and ejection actions to improve the reliability of demolding of the annular shell workpiece and help improve the yield rate of casting production.

[0021] 4. In this invention, through the coordinated operation of the guide rod, spiral guide groove, guide rod, wave groove ring and return spring, the movable ring can simultaneously achieve a small axial reciprocating motion on the basis of circumferential rotation. This can moderately disturb the interface between the casting and the inner wall of the cavity, weaken the clamping effect formed by the cooling and shrinkage of the casting, and alleviate the adsorption effect inside the cavity. This reduces the demolding resistance in the subsequent ejection process and reduces the possibility of microcracks in the casting during demolding. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the mold parting structure of the fixed mold body and the moving mold body of the present invention;

[0024] Figure 3 This is a schematic diagram of the main cross-sectional structure of the mold body of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection structure between the movable ring and the fixed mold body of the present invention;

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the drive frame of the present invention;

[0027] Figure 6 This is a schematic diagram of the connection structure between the demolding rod and the push rod of the present invention;

[0028] Figure 7 This is a schematic diagram of the main cross-sectional structure of the limiting ring of the present invention;

[0029] Figure 8 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0030] In the diagram: 1. Fixed mold body; 2. Moving mold body; 3. Injection barrel; 4. Feed hopper; 5. Positioning rod; 6. Positioning groove; 7. Bracket; 8. Push rod; 901. Movable ring; 902. Guide rod; 903. Spiral guide groove; 904. Limiting ring; 905. Return spring one; 906. Wave groove ring; 907. Guide rod; 908. Ball bearing; 1001. Primary demolding rod; 1002. Secondary demolding rod; 1003. Push ring; 1004. Annular tube; 1005. Connecting hose; 1006. Feed tube; 1007. Drive frame; 1008. Wedge block; 1009. Support frame; 1010. Impact block; 1011. Return spring two. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0032] Please see Figures 1-8 The present invention provides a technical solution: a lightweight aluminum shell die casting mold, including a fixed mold body 1 and a moving mold body 2. Mold cavities are opened on the opposite surfaces of the fixed mold body 1 and the moving mold body 2. An injection cylinder 3 is fixedly opened on the right side of the moving mold body 2. A feed hopper 4 is provided on the top of the injection cylinder 3. Positioning rods 5 are fixedly installed at equal angles on the four sides of the left side of the moving mold body 2. Positioning grooves 6 are opened at equal angles on the four sides of the right side of the fixed mold body 1.

[0033] The system also includes two brackets 7, which are bolted to the upper and lower left sides of the fixed mold body 1. A push rod 8 is slidably connected between the two brackets 7. Demolding components are provided on the left, outer, and inner sides of the fixed mold body 1. Each demolding component includes a primary demolding rod 1001, which is bolted to the right side of the push rod 8. A push ring 1003 is fixed to the right side of the push rod 8 at the position of the primary demolding rod 1001. Secondary demolding rods 1002 are equidistantly connected to the right side of the interior of the fixed mold body 1. The end of the primary demolding rod 1001 away from the push rod 8 extends into the interior of the fixed mold body 1. Both the primary demolding rod 1001 and the multiple secondary demolding rods 1002 are slidably connected to the fixed mold body 1. The positions of the multiple secondary demolding rods 1002 correspond to the positions of the push ring 1003.

[0034] In one embodiment of the present invention, the fixed mold body 1 and the moving mold body 2 are installed on a die-casting machine to complete the mold closing. Then, molten metal is fed into the injection cylinder 3 through the feed hopper 4 and filled into the mold cavity formed by the fixed mold body 1 and the moving mold body 2 under high pressure. After the molten metal cools and solidifies, the fixed mold body 1 and the moving mold body 2 perform the mold separation action. After the mold separation, the push rod 8 moves horizontally, driving the primary demolding rod 1001 to extend forward and initially push the middle position of the workpiece. The push rod 8 continues to drive the push ring 1003 to move. The push ring 1003 contacts multiple secondary demolding rods 1002 in sequence and drives the secondary demolding rods 1002 to move synchronously, ejecting from the periphery of the workpiece. This step-by-step ejection method can disperse the demolding load within a certain range and reduce the probability of the shell being scratched or deformed.

[0035] The primary demolding rod 1001 and the multiple secondary demolding rods 1002 are hollow inside, and holes are opened at equal angles on the outer side of the right end of the primary demolding rod 1001 and the multiple secondary demolding rods 1002. An annular tube 1004 is fixedly connected to the left side of the fixed mold body 1 outside the multiple secondary demolding rods 1002, and the annular tube 1004 is connected to the multiple secondary demolding rods 1002 through multiple connecting hoses 1005. The primary demolding rod 1001 and the annular tube 1004 are connected to the external demolding machine supply device through the feed pipe 1006.

[0036] A drive frame 1007 is provided on the outer side of the fixed mold body 1, and a wedge block 1008 is fixedly connected to the inner side of the drive frame 1007 at equal angles. A support frame 1009 is fixed to the outer surface of the fixed mold body 1 at equal intervals by bolts. A striking block 1010 is slidably connected through the inside of the support frame 1009, and a second return spring 1011 is provided on the outer side of the striking block 1010. The two ends of the second return spring 1011 are fixedly connected to the outer side of the striking block 1010 and the inner wall of the support frame 1009, respectively. The drive frame 1007 is slidably connected to the outer side of the fixed mold body 1, and the left side of the drive frame 1007 is fixedly connected to the horizontal end of the push rod 8 by bolts. The inclined surface of the wedge block 1008 is in contact with the end of the striking block 1010.

[0037] In one embodiment of the present invention, during the stage of ejecting the workpiece by the primary demolding rod 1001 and the secondary demolding rod 1002, the demolding agent output by the external equipment is transported to the interior of each demolding rod through the feed pipe 1006, the annular pipe 1004, and the connecting hose 1005, and then sprayed onto the surface of the workpiece through the rod end orifice to achieve demolding lubrication. At the same time as the push rod 8 moves horizontally, it drives the drive frame 1007 to move synchronously. The multiple wedge blocks 1008 set on the inner side of the drive frame 1007 are displaced accordingly, intermittently squeezing the end of the striking block 1010, so that the striking block 1010 strikes the outside of the fixed mold body 1. With the cooperation of the return spring 1011, the striking block 1010 achieves reciprocating striking, and the workpiece is ejected from the cavity by means of vibration, which is beneficial to improving the overall stability of the casting demolding process.

[0038] The fixed mold body 1 is provided with a force-relieving mold assembly. The force-relieving mold assembly includes a movable ring 901, which is rotatably connected to the mold cavity inside the fixed mold body 1. A spiral guide groove 903 is provided on the outer side of the movable ring 901. A guide rod 902 is provided inside the fixed mold body 1 above the movable ring 901. One end of the guide rod 902 is fixed to the outer side of the secondary demolding rod 1002 by bolts, and the other end of the guide rod 902 is embedded and slidably connected inside the spiral guide groove 903.

[0039] A limiting ring 904 is fitted on the outer side of the left end of the movable ring 901, and multiple balls 908 are assembled between the limiting ring 904 and the movable ring 901. A guide rod 907 is bolted to the left end of the movable ring 901 at an equal angle. A wave groove ring 906 is fixedly connected to the left end of the movable ring 901 inside the fixed mold body 1. A return spring 905 is installed between the left end of the limiting ring 904 and the inner wall of the fixed mold body 1. The limiting ring 904 is slidably connected to the inside of the fixed mold body 1. The movable ring 901 forms a rolling fit with the limiting ring 904 through multiple balls 908. The ends of multiple guide rods 907 are in contact with the wave groove of the wave groove ring 906.

[0040] In one embodiment of the present invention, during the movement of the secondary demolding rod 1002, the guide rod 902 is simultaneously displaced. The guide rod 902 slides along the groove wall of the spiral guide groove 903, driving the movable ring 901 to rotate. When the movable ring 901 rotates, it drives multiple guide rods 907 to move circumferentially along the wave groove of the wave groove ring 906. With the cooperation of the return spring 905, the movable ring 901 generates a small axial reciprocating motion while rotating, thereby assisting in loosening the workpiece, weakening the bonding effect between the casting and the inner wall of the cavity, and alleviating the demolding resistance caused by the clamping force.

[0041] Working principle: First, the fixed mold body 1 and the moving mold body 2 are installed on the die casting machine to complete the mold closing; molten metal is fed into the injection cylinder 3 through the feed hopper 4 and filled into the mold cavity formed by the fixed mold body 1 and the moving mold body 2 under high pressure; after the molten metal cools and solidifies, the fixed mold body 1 and the moving mold body 2 complete the mold separation.

[0042] After the mold is separated, the push rod 8 moves horizontally, driving the primary demolding rod 1001 forward to initially push the middle position of the workpiece. As the push rod 8 continues to drive the push ring 1003 to move, the push ring 1003 gradually contacts multiple secondary demolding rods 1002, thereby driving the secondary demolding rods 1002 to move synchronously and perform the ejection action from the four sides of the workpiece. By adopting a step-by-step ejection method, the middle and four sides of the workpiece are subjected to force successively, which can distribute the demolding force to a certain extent and reduce the possibility of the shell being scratched or deformed.

[0043] During the movement of the secondary demolding rod 1002, it will drive the guide rod 902 to move together. The guide rod 902 slides along the groove wall of the spiral guide groove 903, driving the movable ring 901 to rotate. While the movable ring 901 rotates, it will drive multiple guide rods 907 to move circumferentially along the wave groove of the wave groove ring 906. With the cooperation of the return spring 905, the movable ring 901 can also generate a certain amplitude of axial reciprocating motion while rotating, which helps to loosen the workpiece. This can moderately damage the joint surface between the casting and the inner wall of the cavity, and reduce the demolding resistance caused by the tightness.

[0044] During the process of the primary demolding rod 1001 and the secondary demolding rod 1002 pushing the workpiece, the externally supplied demolding agent is delivered to the interior of each demolding rod through the feed pipe 1006, the annular pipe 1004 and the connecting hose 1005, and then sprayed onto the surface of the workpiece from the orifice at the end of the rod to play the role of demolding lubrication.

[0045] At the same time, when the push rod 8 moves, it will drive the drive frame 1007 to move horizontally in sync. Several wedge blocks 1008 on the inner side of the drive frame 1007 follow the displacement and intermittently squeeze the end of the striking block 1010, so that the striking block 1010 produces a knocking action on the outside of the fixed mold body 1. Under the synergistic action of the reset spring 1011, the striking block 1010 can realize reciprocating knocking, assisting the workpiece to get out of the cavity and helping to improve the stability of the casting demolding.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A lightweight aluminum shell die casting mold, comprising a fixed mold body (1) and a moving mold body (2), wherein mold cavities are provided on the opposite surfaces of the fixed mold body (1) and the moving mold body (2), and an injection cylinder (3) is fixedly provided on the right side of the moving mold body (2), and a feed hopper (4) is provided on the top of the injection cylinder (3), and positioning rods (5) are fixedly installed at equal angles on the left side of the moving mold body (2), and positioning grooves (6) are provided at equal angles on the right side of the fixed mold body (1). Its features are: It also includes two brackets (7), which are fixedly installed on the upper and lower left sides of the fixed mold body (1) by bolts, and a push rod (8) is slidably connected between the two brackets (7). A force-releasing mold assembly is provided inside the fixed mold body (1). A demolding assembly is provided on the left, outer and inner sides of the fixed mold body (1). The demolding assembly includes a primary demolding rod (1001). The primary demolding rod (1001) is fixedly installed on the right side of the push rod (8) by bolts, and a push ring (1003) is fixed on the right side of the push rod (8) at the position of the primary demolding rod (1001). A secondary demolding rod (1002) is equidistantly connected to the right side of the inside of the fixed mold body (1).

2. The lightweight aluminum shell die-casting mold according to claim 1, characterized in that: The end of the primary demolding rod (1001) away from the push rod (8) extends into the interior of the fixed mold body (1), and the primary demolding rod (1001) and the multiple secondary demolding rods (1002) are all limited sliding connections with the fixed mold body (1), and the positions of the multiple secondary demolding rods (1002) correspond to those of the push ring (1003).

3. The lightweight aluminum shell die-casting mold according to claim 1, characterized in that: The primary demolding rod (1001) and the multiple secondary demolding rods (1002) are hollow inside, and holes are opened at equal angles on the outer side of the right end of the primary demolding rod (1001) and the multiple secondary demolding rods (1002).

4. The lightweight aluminum shell die-casting mold according to claim 1, characterized in that: The fixed mold body (1) is fixedly connected to an annular tube (1004) on the left side outside of multiple secondary demolding rods (1002), and the annular tube (1004) and the multiple secondary demolding rods (1002) are connected by multiple connecting hoses (1005). The primary demolding rod (1001) and the annular tube (1004) are connected to the external demolding machine supply device through the feed pipe (1006).

5. A lightweight aluminum shell die-casting mold according to claim 1, characterized in that: A drive frame (1007) is provided on the outer side of the fixed mold body (1), and a wedge block (1008) is fixedly connected at equal angles on the inner side of the drive frame (1007). A support frame (1009) is fixed at equal intervals on the outer surface of the fixed mold body (1) by bolts. A striking block (1010) is slidably connected through the inside of the support frame (1009), and a second reset spring (1011) is provided on the outer side of the striking block (1010). The two ends of the second reset spring (1011) are fixedly connected to the outer side of the striking block (1010) and the inner wall of the support frame (1009), respectively.

6. A lightweight aluminum shell die-casting mold according to claim 5, characterized in that: The drive frame (1007) is slidably connected to the outside of the fixed mold body (1), and the left side of the drive frame (1007) is fixedly connected to the horizontal end of the push rod (8) by bolts. The inclined surface of the wedge block (1008) is in contact with the end of the striking block (1010).

7. A lightweight aluminum shell die-casting mold according to claim 1, characterized in that: The stress-relieving mold assembly includes a movable ring (901), which is rotatably connected to the mold cavity inside the fixed mold body (1). A spiral guide groove (903) is provided on the outer side of the movable ring (901), and a guide rod (902) is provided inside the fixed mold body (1) above the movable ring (901).

8. A lightweight aluminum shell die-casting mold according to claim 7, characterized in that: One end of the guide rod (902) is fixed to the outside of the secondary demolding rod (1002) by bolts, and the other end of the guide rod (902) is embedded in the spiral guide groove (903) for sliding connection.

9. A lightweight aluminum shell die-casting mold according to claim 7, characterized in that: A limiting ring (904) is sleeved on the outer side of the left end of the movable ring (901), and multiple balls (908) are assembled between the limiting ring (904) and the movable ring (901). A guide rod (907) is bolted to the left end of the movable ring (901) at an equal angle. A wave groove ring (906) is fixedly connected to the left end of the movable ring (901) inside the fixed mold body (1). A return spring (905) is installed between the left end of the limiting ring (904) and the inner wall of the fixed mold body (1).

10. A lightweight aluminum shell die-casting mold according to claim 9, characterized in that: The limiting ring (904) is slidably connected inside the fixed mold body (1). The movable ring (901) forms a rolling fit with the limiting ring (904) through multiple balls (908). The ends of the multiple guide rods (907) are in contact with the wave groove of the wave groove ring (906).

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