Diverging cone assembly for aluminum alloy differential pressure casting mold

Abstract

The utility model discloses a kind of flow splitting cone subassemblies of aluminum alloy differential pressure casting mould, belong to casting technical field.The component includes: flow splitting cone;The point cold hole of axial extension in flow splitting cone;At least one threaded hole, at least one threaded hole is located in the rear end of flow splitting cone, for with the fastening bolt connection of bolt mounting hole passing through upper mould core, to realize the axial fastening between flow splitting cone and upper mould core;Flow splitting cone anti-rotation structure is set to the outer periphery of flow splitting cone, flow splitting cone anti-rotation structure is used to cooperate with the flow splitting cone stop rotation platform on upper mould core, to limit the circumferential rotation of flow splitting cone relative to upper mould core.The component is directly fastened by the threaded hole of flow splitting cone itself and fastening bolt, so that the huge hug force when ejection casting is shared by bolt, avoid the stress concentration of threaded portion, effectively prevent the fracture of thread, improve the reliability of flow splitting cone, to improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to a flow divider cone assembly for an aluminum alloy differential pressure casting mold. Background Technology

[0002] With the trend towards lightweighting in the automotive industry, aluminum alloy differential pressure casting technology is widely used in the production of chassis load-bearing structural components such as steering knuckles. In this process, the flow divider cone is a key component in the mold system, and its main function is to rationally distribute the molten metal flow to the mold cavity.

[0003] In related technologies, the flow divider cone of a differential pressure casting mold passes through the upper mold core via a screw extending from its rear end and is locked from the back of the mold by a fastening nut. Additionally, to prevent the casting from remaining in the upper mold during mold opening, an undercut structure is typically designed on the flow divider cone.

[0004] However, due to the presence of the inverted structure, the clamping force of the casting on the flow divider cone is significantly increased. During ejection, the enormous demolding force acts entirely on the fastening threaded part at the rear end of the flow divider cone, which can easily lead to stress concentration and breakage of the thread. This necessitates the replacement of the flow divider cone, resulting in reduced production efficiency. Therefore, a new flow divider cone structure is urgently needed to improve the stability and efficiency of differential pressure casting production. Summary of the Invention

[0005] This utility model provides a flow divider cone assembly for an aluminum alloy differential pressure casting mold to solve the above-mentioned problems. The technical solution is as follows: On one hand, a flow divider cone assembly for an aluminum alloy differential pressure casting mold is provided, the flow divider cone assembly comprising: a flow divider cone; The axially extending point cooling holes within the flow divider cone; At least one threaded hole, located at the rear end of the flow divider cone, is used to connect with a fastening bolt passing through a bolt mounting hole on the upper mold core to achieve axial fastening between the flow divider cone and the upper mold core; A flow divider cone anti-rotation structure is provided on the outer periphery of the flow divider cone. The flow divider cone anti-rotation structure is used to cooperate with the flow divider cone anti-rotation platform on the upper mold core to limit the circumferential rotation of the flow divider cone relative to the upper mold core.

[0006] In one possible implementation, the number of threaded holes is three or more, and they are evenly distributed along the circumference of the flow divider cone.

[0007] In one possible implementation, the flow divider cone assembly further includes: a spot cooling component; the inlet end of the spot cooling hole is provided with a spot cooling mounting thread for sealing connection with the spot cooling component; the spot cooling component passes through a spot cooling through hole on the upper mold core and is connected to the spot cooling hole via the spot cooling mounting thread.

[0008] In one possible implementation, the structure of the first side of the flow divider cone matches the flow divider cone mounting hole on the upper mold core, wherein the first side is the side of the flow divider cone closer to the upper mold core.

[0009] The technical solution provided by this utility model brings at least the following beneficial effects: The technical solution provided by this utility model achieves direct axial fastening through the threaded hole of the flow divider cone and the fastening bolt, so that the huge clamping force during ejection of the casting is distributed by the bolt, greatly avoiding stress concentration at the threaded part and effectively preventing thread breakage. Simultaneously, the anti-rotation structure integrated on the outer periphery of the flow divider cone cooperates with the upper mold core to prevent circumferential rotation during operation. The point cooling holes integrated inside the flow divider cone achieve precise cooling, further reducing thermal stress. This improves the reliability of the flow divider cone and the continuous operation time of the mold, thereby increasing production efficiency. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a cross-sectional view of a flow divider cone assembly for an aluminum alloy differential pressure casting mold provided by this utility model; Figure 2 This is a schematic diagram of the connection between the flow divider cone assembly and the upper mold core of an aluminum alloy differential pressure casting mold provided by this utility model; Figure 3 This is a schematic diagram of the connection between the flow divider cone assembly and the upper mold core of another aluminum alloy differential pressure casting mold provided by this utility model.

[0012] Reference numerals: 1. Diverter cone; 2. Upper mold core; 3. Fastening bolt; 4. Cooling assembly; 101. Diverter cone mounting hole; 102. Diverter cone anti-rotation platform; 103. Cooling through hole; 104. Bolt mounting hole; 105. Threaded hole; 106. Cooling hole; 107. Cooling mounting thread; 108. Diverter cone anti-rotation structure. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings.

[0014] It should be noted that the terms "first," "second," etc. (if applicable) in the specification of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of utility models consistent with some aspects of this application.

[0015] Driven by the trend of lightweighting in the automotive industry, aluminum alloy differential pressure casting technology is widely used in the production of key chassis load-bearing components such as steering knuckles and control arms due to its ability to produce complex structural parts with high density and excellent mechanical properties. In this process, the flow divider cone is an important component of the mold gating system, and its core function is to guide and distribute the molten metal flow so that it smoothly fills the mold cavity.

[0016] In related technologies, the rear end of the flow divider cone is machined with an externally threaded rod. This rod passes through a corresponding through hole on the upper mold core and is locked in place on the back of the mold with a large fastening nut. To ensure smooth demolding of the casting as it moves with the moving mold plate during mold opening, an undercut structure is usually designed on the surface of the flow divider cone. However, in this approach, while the undercut structure successfully prevents the casting from being retained in the mold, it also greatly increases the clamping force of the casting on the flow divider cone. When ejecting the casting, the demolding force acts entirely in the opposite direction at the fixed point of the flow divider cone. Since the fastening method relies on the radial locking of a single nut, all stress is highly concentrated in the meshing area between the nut and the threaded rod, which can easily lead to shear fracture of the thread due to stress concentration at this point.

[0017] If the aforementioned fracture occurs, the machine must be stopped immediately to disassemble the mold and replace or repair the flow divider cone. This not only leads to production interruption, severely affecting production cycle and efficiency, but also results in huge economic losses due to frequent unplanned downtime.

[0018] This invention provides a flow divider cone assembly for an aluminum alloy differential pressure casting mold, which solves the above-mentioned problems. See also... Figure 1 , Figure 1 This is a cross-sectional view of a flow divider cone assembly for an aluminum alloy differential pressure casting mold provided by this utility model. (Combined with...) Figure 2 and Figure 3 The diagram shows that, Figure 2 This is a schematic diagram of the connection between the flow divider cone assembly and the upper mold core of an aluminum alloy differential pressure casting mold provided by this utility model. It can also be used to... Figure 2 Considered Figure 1 A bottom view taken from below; Figure 3 This is a schematic diagram showing the connection between the flow divider cone assembly and the upper mold core of another aluminum alloy differential pressure casting mold provided by this utility model. It can also be used to... Figure 3Considered Figure 1 A top-down view.

[0019] The component includes: a flow divider cone; an axially extending spot cooling hole within the flow divider cone; at least one threaded hole located at the rear end of the flow divider cone for connection with a fastening bolt passing through a bolt mounting hole on the upper mold core to achieve axial fastening between the flow divider cone and the upper mold core; and a flow divider cone anti-rotation structure disposed on the outer periphery of the flow divider cone for cooperating with a flow divider cone anti-rotation platform on the upper mold core to limit the circumferential rotation of the flow divider cone relative to the upper mold core.

[0020] As a core component, the flow divider cone 1 has an axially machined point cooling hole 106 inside. This point cooling hole 106 serves as the flow path for the cooling medium. Its diameter and length are calculated to ensure sufficient cooling flow and pressure, achieving efficient thermal management of the flow divider cone 1's working area and significantly reducing the risk of fatigue damage caused by cyclic thermal stress. At the rear end of the flow divider cone 1 facing the upper mold core 2, at least one threaded hole 105 is machined. The axis of the threaded hole 105 is parallel to the axis of the flow divider cone 1, and its dimensions and thread profile ensure reliable thread engagement with the standard fastening bolt 3. This allows the fastening bolt 3 to pass through the bolt mounting hole 104 from the back of the upper mold core 2 and directly screw into the body of the flow divider cone 1, establishing a direct fastening connection. This transforms traditional radial locking into axial tension, resulting in a more rational force distribution and fundamentally improving the stress state.

[0021] A specific anti-rotation structure 108 is formed on the outer circumferential surface of the flow divider cone 1. The anti-rotation structure 108 is designed as a non-cylindrical shoulder or an irregular structure containing at least one plane. The geometry and dimensions of the anti-rotation structure 108 achieve a high-precision transition fit or clearance fit with the corresponding anti-rotation platform 102 machined at the inlet of the flow divider cone mounting hole 101 in the upper mold core 2. When the flow divider cone 1 is installed into the upper mold core 2, the engagement between the anti-rotation structure 108 and the anti-rotation platform 102 immediately and effectively restricts any circumferential rotational freedom of the flow divider cone 1 around its axis. The anti-rotation mechanism eliminates the additional torsional load caused by the accidental rotation of the flow divider cone 1, effectively avoiding stress concentration in structurally weak areas such as the transition area between the thin rod and the head, thereby significantly improving the overall reliability of the structure.

[0022] In one possible implementation, the number of threaded holes is three or more, and they are evenly distributed along the circumference of the flow divider cone.

[0023] Three or more threaded holes 105 are evenly distributed along the circumferential direction of the rear end of the flow divider cone 1. The specific choice of number and layout is based on optimizing the connection stiffness and force uniformity between the flow divider cone 1 and the upper mold core 2. When three distributed threaded holes 105 are used, or when more and more evenly distributed threaded holes 105 are used, a stable and symmetrical axial fastening force field can be formed on the rear end face of the flow divider cone 1 with the corresponding fastening bolts 3. The symmetrical force distribution can ensure that the axis of the flow divider cone 1 is precisely aligned with the axis of the flow divider cone mounting hole 101 of the upper mold core 2, effectively preventing additional bending moments caused by the misalignment of the fastening force.

[0024] During the casting process, when the ejector mechanism pushes the casting away from the mold, the enormous clamping force generated by the casting on the flow divider cone 1 is transmitted almost uniformly to each fastening bolt 3 through the rear end face of the flow divider cone 1. The fastening bolts 3 then distribute the load to the entire upper mold core 2 structure. The force transmission path significantly reduces the peak stress per unit area of ​​each threaded hole 105, avoiding excessive stress concentration in local areas. This fundamentally eliminates the risk of thread pull-out or tearing of the material around the threaded hole 105, which is common in single-point fastening methods. At the same time, the multiple evenly distributed fastening points together form a strong anti-loosening structure that can effectively resist the vibration and impact generated during the casting process, ensuring that the connection pair maintains a reliable fastening state under long-term repeated thermal cycling and mechanical loads, and maintaining the stability of the working position of the flow divider cone 1.

[0025] In one possible implementation, the flow divider cone assembly further includes: a spot cooling component; the inlet end of the spot cooling hole is provided with a spot cooling mounting thread for sealing connection with the spot cooling component; the spot cooling component passes through a spot cooling through hole on the upper mold core and is connected to the spot cooling hole via the spot cooling mounting thread.

[0026] The flow divider cone assembly also includes a spot cooling component 4, thus forming a complete and controllable cooling circulation system. The inlet end of the spot cooling hole 106 is machined with a precision spot cooling mounting thread 107. This thread parameter matches the connector thread at the end of the spot cooling component 4, and its core function is to achieve a rigid connection and seal between the spot cooling component 4 and the spot cooling hole 106. During actual assembly, the spot cooling component 4 first passes through the spot cooling through hole 103 pre-machined on the upper mold core 2, and then its threaded connecting end is screwed and tightened with the spot cooling mounting thread 107 at the inlet end of the spot cooling hole 106.

[0027] Optionally, to ensure that the cooling medium does not leak under high pressure, a sealing gasket is usually added to the threaded connection or a tapered pipe thread seal is used, thus forming a reliable sealing interface while maintaining the mechanical connection. After assembly, the internal flow channel of the cooling component 4 is precisely aligned and connected with the cooling hole 106 of the flow divider cone 1, forming a closed cooling path from the external cooling source directly to the high-temperature working area inside the flow divider cone 1. This path allows the cooling medium to efficiently remove the large amount of heat accumulated in the flow divider cone 1 during continuous casting, achieving precise control of the working temperature of the flow divider cone 1. This significantly reduces the thermal stress and thermal fatigue damage caused by overheating in the flow divider cone 1, directly improving its fracture resistance and service life. At the same time, by stabilizing the thermal balance of the mold, it also ensures the solidification quality and microstructure of the casting in the area surrounding the flow divider cone 1.

[0028] In one possible implementation, the structure of the first side of the flow divider cone matches the flow divider cone mounting hole on the upper mold core, and the first side is the side of the flow divider cone closer to the upper mold core.

[0029] The geometry of the first side of the flow divider cone 1, which is near the upper mold core 2, forms a precise match with the shape of the flow divider cone mounting hole 101 machined on the upper mold core 2. The outer contour surface of the first side of the flow divider cone 1 and the inner wall surface of the flow divider cone mounting hole 101 maintain precise fit tolerances in both the axial and radial directions. When the flow divider cone 1 is inserted into the flow divider cone mounting hole 101, a large area of ​​contact and support is formed between them. The primary function of this structural matching is to achieve precise positioning and guidance of the flow divider cone 1 relative to the upper mold core 2, ensuring that the axis of the flow divider cone 1 coincides with the axis of the flow divider cone mounting hole 101, thus establishing an accurate initial reference for the subsequent engagement of the flow divider cone anti-rotation structure 108 and the tightening of the fastening bolts 3. Secondly, the large-area contact allows various loads generated during the casting process, including the impact force of the molten metal and the clamping force of the casting, to be effectively dispersed and transferred to the upper mold core 2, which has higher structural strength, preventing stress concentration in small local areas of the flow divider cone 1.

[0030] In addition, the tight interface enhances the heat transfer from the high-temperature flow divider cone 1 to the relatively low-temperature upper mold core 2, forming an auxiliary heat dissipation path. This plays an important supplementary role to the active cooling system formed by the integrated cold hole 106, and together they optimize the thermal management of the flow divider cone 1.

[0031] In summary, the technical solution provided by this utility model, by setting threaded holes on the body of the flow divider cone and achieving axial fastening through fastening bolts, allows the enormous clamping force generated during the ejection of the casting to be evenly distributed to the upper mold core through multiple bolts, greatly avoiding stress concentration and effectively preventing the thread breakage accident most common in traditional structures. Simultaneously, the integrated flow divider cone anti-rotation structure, in conjunction with the flow divider cone anti-rotation platform of the upper mold core, eliminates the risk of circumferential rotation of the flow divider cone during operation, avoiding breakage at the junction of the thin rod and the head due to torsional loads.

[0032] By sealing the point-cooling assembly to the point-cooling hole of the flow divider cone with a point-cooling mounting thread, a closed cooling path directly reaching the heat source is constructed. This actively and efficiently removes the heat accumulated in the flow divider cone, controlling its operating temperature. This not only directly reduces the risk of thermal fatigue and overheating softening of the flow divider cone, enhancing its mechanical strength, but also helps stabilize the thermal balance of the mold and improve the solidification quality of the casting in critical areas. From a thermodynamic perspective, this provides dual protection for solving fracture problems and ensuring product quality.

[0033] The precise geometric matching ensures the initial positioning accuracy of the flow divider cone installation, laying the foundation for effective engagement of the anti-rotation structure and uniform bolt tightening. Together, these factors guarantee the structural integrity and functional stability of the assembly under long-term, repeated thermo-mechanical loads.

[0034] For example, regarding the flow divider cone assembly of the aluminum alloy differential pressure casting mold proposed in this embodiment of the invention, the installation between the flow divider cone assembly and the upper mold core of the aluminum alloy differential pressure casting mold can be performed according to the following steps: Positioning and assembly: Insert the flow divider cone into the flow divider cone mounting hole of the upper mold core from the front end, while ensuring that the flow divider cone anti-rotation platform of the flow divider cone and the flow divider cone anti-rotation platform of the upper mold core are precisely engaged to complete the anti-rotation positioning.

[0035] Fastening connection: Insert the fastening bolts through the bolt mounting holes from the back of the upper mold core and thread them into the threaded holes on the flow divider cone. By tightening the bolts evenly, the flow divider cone and the upper mold core are reliably fixed. Cooling path construction: The point cooling component is passed through the point cooling through hole of the upper mold core and sealed and tightened with the point cooling mounting thread of the flow divider cone. Finally, the point cooling component is connected with the point cooling hole of the flow divider cone to form a leak-free and stable flow cooling path to meet the cooling requirements of the mold during operation.

[0036] Those skilled in the art will understand that Figures 1-3 The structure shown does not constitute a limitation on the structure of this utility model. It may include more or fewer components than shown, or combine certain components, or use different component arrangements.

[0037] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0038] The above are merely exemplary embodiments of the present utility model and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A flow divider cone assembly for an aluminum alloy differential pressure casting mold, characterized in that, The flow divider cone assembly includes: a flow divider cone; The axially extending point cooling holes within the flow divider cone; At least one threaded hole, located at the rear end of the flow divider cone, is used to connect with a fastening bolt passing through a bolt mounting hole on the upper mold core to achieve axial fastening between the flow divider cone and the upper mold core; A flow divider cone anti-rotation structure is provided on the outer periphery of the flow divider cone. The flow divider cone anti-rotation structure is used to cooperate with the flow divider cone anti-rotation platform on the upper mold core to limit the circumferential rotation of the flow divider cone relative to the upper mold core.

2. The flow divider cone assembly of the aluminum alloy differential pressure casting mold according to claim 1, characterized in that, The number of threaded holes is three or more, and they are evenly distributed along the circumference of the flow divider cone.

3. The flow divider cone assembly of the aluminum alloy differential pressure casting mold according to claim 1, characterized in that, The flow splitter cone assembly further includes: a point cooling assembly; The inlet end of the point cooling hole is provided with a point cooling mounting thread for sealing connection with the point cooling assembly; The spot cooling component passes through the spot cooling through hole on the upper mold core and is connected to the spot cooling hole via the spot cooling mounting thread.

4. The flow divider cone assembly of the aluminum alloy differential pressure casting mold according to claim 1, characterized in that, The structure of the first side of the flow divider cone matches the flow divider cone mounting hole on the upper mold core, and the first side is the side of the flow divider cone closer to the upper mold core.

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