Aluminum alloy hub gravity casting mold

Abstract

The invention relates to an aluminum alloy hub gravity casting mold, and belongs to the technical field of aluminum alloy casting, the aluminum alloy hub gravity casting mold comprises an upper mold, a lower mold and a side mold, the upper mold, the lower mold and the side mold are closed to form a hub cavity, and a plurality of feeding cavities are distributed in the inner side of the side mold in the circumferential direction of the hub cavity; each feeding cavity is communicated with a rim area on the top of the hub cavity, and lateral cooling assemblies are further arranged on the side die and distributed on the outer sides of the feeding cavities. A traditional whole-circle type side cap is replaced with the independent feeding cavities distributed in the circumferential direction of the hub cavity, the lateral cooling assembly is combined, the problems that the metal utilization rate is low and the feeding path is long due to the traditional whole-circle type side cap are solved, and the feeding efficiency is improved; and meanwhile, the independent flash is formed after the split type feeding cavity is solidified, the cutting and polishing procedures are simplified, and the post-treatment cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of aluminum alloy casting, and in particular to a gravity casting mold for an aluminum alloy wheel hub. Background Art

[0002] The wheel hub is the core component of vehicle load-bearing and steering, and its performance directly affects driving safety and energy efficiency. Aluminum alloy wheels have become the mainstream choice of modern cars due to their advantages of light weight and high specific strength. Gravity casting is the main forming process of aluminum alloy wheels. The metal liquid fills the mold cavity with its own weight and forms a blank through natural solidification. The key to this process lies in the mold design, especially the shrinkage structure in the rim area - the side cap.

[0003] The side cap is a liquid storage cavity set on the side mold of the hub mold. Its core function is to compensate for the molten metal required for the solidification shrinkage of the rim, while collecting oxide inclusions and gases. The traditional solution adopts a full-circle side cap structure, that is, a continuous annular cavity surrounding the rim. Although this structure can cover the entire shrinkage feeding area, it has inherent defects: the full-circle side cap consumes a large amount of aluminum liquid to maintain the shrinkage feeding capacity, and the actual effective utilization rate is low, resulting in a waste of raw materials; the continuity of the annular structure makes it difficult to dissipate the heat accumulation, and the cooling time of the rim is significantly extended, affecting production efficiency; the lengthy shrinkage feeding path leads to an increase in the flow resistance of the molten metal, and the shrinkage feeding flow in the terminal area is significantly attenuated, which is easy to form shrinkage defects in the spoke transition zone.

[0004] In addition, the annular flash formed after the solidification of the whole ring of edge risers needs to be cut and polished, and the post-processing process is cumbersome and costly. Although the industry has tried to optimize the size of the risers or add cooling water channels, it is always difficult to balance the shrinkage feeding efficiency and resource consumption due to the space constraints of the annular structure. How to achieve the coordination of precise shrinkage feeding and efficient cooling has become a key problem in the upgrade of the gravity casting process of aluminum alloy wheels. Summary of the invention

[0005] In order to improve the problems of low metal utilization and lengthy shrinkage feeding path caused by traditional full-circle edge burrs, the present application provides an aluminum alloy wheel gravity casting mold.

[0006] The present application provides an aluminum alloy wheel hub gravity casting mold, which adopts the following technical solution: A gravity casting mold for an aluminum alloy wheel hub comprises an upper mold, a lower mold and a side mold. The upper mold, the lower mold and the side mold are combined to form a hub cavity. A plurality of feeding chambers are distributed along the circumference of the hub cavity on the inner side of the side mold. Each of the feeding chambers is respectively connected to the top rim area of ​​the hub cavity. A lateral cooling assembly is also provided on the side mold, and the lateral cooling assembly is distributed on the outer side of the feeding chamber.

[0007] By adopting the above technical solution, the traditional full-circle side buoy is replaced by multiple independent shrinkage feeding chambers distributed along the circumference of the hub cavity, and combined with the lateral cooling component, the inherent defects of the traditional annular side buoy are directly improved. On the one hand, the discrete shrinkage feeding chamber greatly reduces the occupancy of molten aluminum and reduces the waste of raw materials; the split design shortens the shrinkage feeding path, ensures that the flow resistance of molten aluminum in the terminal area such as the spoke transition zone is reduced, and avoids shrinkage defects caused by the attenuation of shrinkage flow; on the other hand, the lateral cooling component breaks the heat accumulation of the whole circle side buoy through directional heat dissipation, which is conducive to accelerating the sequential solidification of the rim area and shortening the cooling cycle; in addition, the split shrinkage feeding chamber forms an independent flash after solidification, simplifies the cutting and grinding process, and reduces the post-processing cost, thereby achieving synergy among improving shrinkage efficiency, reducing resource consumption, and optimizing production efficiency.

[0008] Optionally, the cross-sectional area of ​​the feeding chamber is gradually reduced from top to bottom.

[0009] By adopting the above technical solution, the cross-sectional area of ​​the feeding chamber gradually decreases from top to bottom, and the feeding pressure is gradually increased by utilizing the tapered structure when the aluminum liquid solidifies and shrinks, thereby compensating for the loss of feeding force caused by the reduction in volume of the split chamber, ensuring the equivalent feeding strength to the traditional full-circle side buoy. At the same time, the tapered design guides the aluminum liquid to fill the rim contraction area first, reducing the residual invalid aluminum liquid and further improving the material utilization rate.

[0010] Optionally, a plurality of mounting grooves are provided on the side mold, and the cooling assembly includes a plurality of rim cooling tubes arranged in the corresponding mounting grooves, and the plurality of rim cooling tubes are arranged around the outer side of the shrinkage feeding chamber, and the water inlet and outlet of the rim cooling tubes pass through the outer wall of the side mold.

[0011] By adopting the above technical solution, a rim cooling pipe surrounding the shrinkage feeding chamber is arranged in the side mold mounting groove, and the heat dissipation rate on the outer side of the split shrinkage feeding chamber is accurately controlled by cooling water circulation, thereby avoiding local uneven heat dissipation caused by the continuous structure of the traditional annular cooling water channel, thereby inhibiting grain coarsening and improving the mechanical properties of the rim area. At the same time, the discrete layout of the cooling pipe and the shrinkage feeding chamber adapts to the split thermal field distribution, thereby enhancing the cooling efficiency and shrinkage feeding capacity.

[0012] Optionally, it also includes a pressurizing mechanism disposed above the side mold, and the pressurizing mechanism is used to extrude the aluminum liquid in the shrinkage feeding chamber.

[0013] By adopting the above technical solution, a pressurizing mechanism is added above the side mold, and continuous pressure is applied to the aluminum liquid in the shrinkage feeding chamber, forcing the aluminum liquid to flow to the rim area in the later stage of solidification, thereby compensating for the insufficient dynamic shrinkage feeding pressure that may exist in the split chamber, significantly improving the shrinkage feeding effect, reducing the internal porosity, and avoiding the passivity of the traditional solution that relies on natural shrinkage feeding.

[0014] Optionally, the pressurizing mechanism includes a sealing cover plate and a thermal expansion sliding assembly arranged on the sealing cover plate, the sealing cover plate is used to close the upper end opening of the shrinkage compensation chamber, the thermal expansion sliding assembly includes an outer sleeve, a microporous plate and a thermal expansion body, the bottom of the outer sleeve is closed and the top is open, the microporous plate is movably arranged in the outer sleeve, and there is a certain friction force between the microporous plate and the inner side wall of the outer sleeve, a variable space is provided between the inner bottom wall of the outer sleeve and the microporous plate, the thermal expansion body is filled in the variable space, an extrusion port for the outer sleeve to pass through is provided on the sealing cover plate, a fixing part is provided on the sealing cover plate, and the microporous plate is connected to the fixing part.

[0015] By adopting the above technical solution and utilizing the thermal expansion characteristics of the thermal expansion sliding assembly, the thermal expansion of the thermal expansion body pushes the outer sleeve downward during the solidification process of the molten aluminum, automatically adjusting the molten aluminum pressure in the shrinkage feeding chamber to achieve dynamic shrinkage matching the solidification process. No external power control is required, and compared with the traditional mechanical pressurizing mechanism, the structure is simplified and the response stability is improved. At the same time, the friction design between the microporous plate and the outer sleeve buffers sudden pressure changes to prevent rim deformation caused by excessive shrinkage feeding.

[0016] Optionally, the thermal expansion body is expanded ceramic particles or expanded graphite particles.

[0017] By adopting the above technical solution, expanded ceramic particles or expanded graphite particles are selected as thermal expansion bodies, and their high temperature resistance and stable thermal expansion coefficient are utilized to ensure that the pressurizing mechanism can work stably for a long time in a high-temperature casting environment, avoiding the performance degradation of traditional metal thermal expansion materials due to oxidation or creep, thereby maintaining the controllability of the shrinkage feeding pressure.

[0018] Optionally, a high temperature resistant sealing ring is provided on the inner side wall of the extrusion port, and the outer cylinder wall of the outer sleeve is tightly fitted with the inner ring of the high temperature resistant sealing ring.

[0019] By adopting the above technical solution, a high-temperature resistant sealing ring is arranged on the inner side of the extrusion port and is tightly matched with the outer sleeve to prevent leakage of molten aluminum or gas infiltration, thereby ensuring the sealing of the pressurization process. At the same time, the sealing ring is designed to withstand high temperature environments, avoiding frequent maintenance problems caused by thermal fatigue of traditional sealing structures.

[0020] Optionally, a plurality of accommodating grooves are provided on the top of the lower mold, and a chimeric block is provided in the sliding seal of the accommodating groove, and the chimeric block is connected to a jacking device.

[0021] By adopting the above technical solution, a slidable interlocking block and a lifting device are set on the top of the lower mold. During demolding, the lifting rod is used to evenly push the interlocking block upward, eliminating the rigid pulling of mold separation that is relied on in traditional demolding, thus avoiding deformation of the wheel hub or surface damage. At the same time, the sliding seal design of the interlocking block reduces the infiltration of aluminum liquid into the mold gap, thereby extending the service life of the mold.

[0022] Optionally, the lifting device includes a lifting drive module and a lifting plate arranged at the output end of the lifting drive module, the lifting plate is arranged at the lower side of the lower mold, and a plurality of lifting rods are arranged on the lifting plate in one-to-one correspondence with the interlocking blocks. The lower end of the lower mold is provided with an avoidance hole for the corresponding lifting rod to pass through, and the avoidance hole is connected with the corresponding accommodating groove. The top end of the lifting rod passes through the avoidance hole and is connected with the corresponding interlocking block. The lifting rod is a hollow rod and a bottom cooling part is provided inside the lifting rod.

[0023] By adopting the above technical solution, a bottom cooling part is arranged inside the jacking rod, and the hollow rod structure is used to synchronously cool the bottom of the hub during the jacking process, thereby accelerating the solidification of this area and reducing the temperature difference with the rim area, thereby reducing the dimensional deviation caused by residual stress. At the same time, the bottom cooling and lateral cooling components form a synergistic heat dissipation network to optimize the overall cooling uniformity.

[0024] Optionally, it also includes a pouring system, which includes a gate and a runner arranged on the side mold, the gate is funnel-shaped, the upper end of the runner is connected to the lower end of the gate, and the lower end of the runner is connected to the hub cavity, and the cross-sectional area of ​​the runner is arranged to decrease in a step-like or nonlinear manner with the flow direction of the aluminum liquid.

[0025] By adopting the above technical scheme, the cross-sectional area of ​​the flow channel of the casting system is designed to be stepped or nonlinearly decreasing, and the filling speed of the aluminum liquid is controlled by the flow resistance gradient, thereby reducing the turbulence and oxidation inclusions caused by uneven flow velocity in the traditional single flow channel. At the same time, it adapts to the discrete liquid supply requirements of the split shrinkage feeding chamber, ensures that each shrinkage feeding chamber is filled synchronously, and improves the uniformity of the internal structure of the hub.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application replaces the traditional full-circle side buoy with multiple independent feeding chambers distributed along the circumference of the hub cavity through the provision of multiple independent feeding chambers, and combines with lateral cooling components to directly improve the inherent defects of the traditional annular side buoy. On the one hand, the discrete feeding chamber greatly reduces the occupancy of molten aluminum (only covers the key shrinkage area), reducing the waste of raw materials; the split design shortens the feeding path, ensures that the flow resistance of molten aluminum in the terminal area such as the spoke transition area is reduced, and avoids shrinkage defects caused by the attenuation of the feeding flow; on the other hand, the lateral cooling component breaks the heat accumulation of the whole circle side buoy through directional heat dissipation, which is conducive to accelerating the sequential solidification of the rim area and shortening the cooling cycle; in addition, the split feeding chamber forms an independent flash after solidification, simplifies the cutting and grinding process, and reduces the post-processing cost, thereby achieving synergy between improving feeding efficiency, reducing resource consumption, and optimizing production efficiency.

[0027] 2. By arranging a rim cooling pipe surrounding the feeding chamber in the side mold mounting groove, the heat dissipation rate on the outside of the split feeding chamber is accurately controlled through cooling water circulation, avoiding the local uneven heat dissipation caused by the continuous structure of the traditional annular cooling water channel, thereby inhibiting grain coarsening and improving the mechanical properties of the rim area. At the same time, the discrete layout of the cooling pipe and the feeding chamber adapts to the split thermal field distribution, enhancing the cooling efficiency and feeding capacity.

[0028] 3. By setting up a pressure mechanism, an additional pressure mechanism is added above the side mold. By applying continuous pressure to the aluminum liquid in the shrinkage feeding chamber, the aluminum liquid is forced to flow to the rim area in the later stage of solidification, compensating for the insufficient dynamic shrinkage feeding pressure that may exist in the split chamber, significantly improving the shrinkage feeding effect, reducing the internal porosity, and avoiding the passivity of the traditional solution that relies on natural shrinkage feeding.

[0029] 4. By designing the cross-sectional area of ​​the pouring system flow channel to be stepped or nonlinearly decreasing, the filling speed of the aluminum liquid is controlled by the flow resistance gradient, reducing the turbulence and oxidation inclusions caused by uneven flow velocity in the traditional single flow channel. At the same time, it adapts to the discrete liquid supply requirements of the split-type shrinkage feeding chamber, ensuring that each shrinkage feeding chamber is filled synchronously, and improving the uniformity of the internal structure of the hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0031] Figure 2 It is a top view of the side mold in Example 1 of the present application.

[0032] Figure 3 It is a structural schematic diagram that reflects the specific structure of the feeding chamber in the first embodiment of the present application.

[0033] Figure 4 It is a schematic diagram of the structure of the pressurizing mechanism in the second embodiment of the present application.

[0034] Figure 5 yes Figure 4 A local enlarged schematic diagram of point A in the middle.

[0035] Figure 6 It is a schematic diagram of the structure of the lifting device in the third embodiment of the present application.

[0036] Explanation of the reference numerals: 1. upper mold; 2. lower mold; 21. accommodating groove; 22. fitting block; 23. avoidance hole; 3. side mold; 31. shrinkage feeding chamber; 32. lateral cooling assembly; 321. rim cooling pipe; 33. mounting groove; 4. pouring system; 41. gate; 42. runner; 5. hub cavity; 6. pressurizing mechanism; 61. sealing cover plate; 611. extrusion port; 6111. high temperature resistant sealing ring; 612. fixing part; 6121. connecting rod; 62. thermal expansion sliding assembly; 621. outer sleeve; 622. microporous plate; 623. thermal expansion body; 624. variable space; 7. lifting device; 71. lifting drive module; 72. lifting plate; 73. lifting rod; 731. bottom cooling part. DETAILED DESCRIPTION

[0037] The following combination Figure 1-Figure 6 , further details of this application are given.

[0038] Embodiment 1:

[0039] The first embodiment of the present application discloses a gravity casting mold for an aluminum alloy wheel hub. Figure 1-Figure 2 A gravity casting mold for an aluminum alloy wheel hub includes an upper mold 1, a lower mold 2, a side mold 3 and a pouring system 4. The upper mold 1, the lower mold 2 and the side mold 3 are combined to form a hub cavity 5. The inner side of the side mold 3 is provided with a plurality of feeding chambers 31 distributed along the circumference of the hub cavity 5. Each feeding chamber 31 is connected to the top rim area of ​​the hub cavity 5. The side mold 3 is also provided with a lateral cooling assembly 32, which is distributed on the outer side of the feeding chamber 31. In the first embodiment, four feeding chambers 31 are provided.

[0040] The traditional full-circle side burr of the casting mold is replaced by multiple independent shrinkage-feeding chambers 31 distributed circumferentially along the hub cavity 5 to form a "multi-chamber side burr", and combined with the lateral cooling component 32, it directly improves the inherent defects of the traditional annular side burr. On the one hand, the discrete shrinkage-feeding chamber 31 greatly reduces the occupancy of molten aluminum (only covers the key shrinkage area), reducing the waste of raw materials; the split design shortens the shrinkage-feeding path, ensures that the flow resistance of molten aluminum in the terminal area such as the spoke transition area is reduced, and avoids shrinkage defects caused by shrinkage flow attenuation; on the other hand, the lateral cooling component 32 breaks the heat accumulation of the whole circle side burr through directional heat dissipation, which is conducive to accelerating the sequential solidification of the rim area and shortening the cooling cycle; in addition, the split shrinkage-feeding chamber 31 forms an independent flash after solidification, simplifies the cutting and polishing process, and reduces the post-processing cost, thereby achieving synergy between improving shrinkage-feeding efficiency, reducing resource consumption, and optimizing production efficiency.

[0041] Reference Figure 1 and Figure 3, the cross-sectional area of ​​each feeding chamber 31 is gradually reduced from top to bottom. In the first embodiment, the feeding chamber 31 is in an inverted trapezoid. In this way, the feeding pressure is gradually increased when the aluminum liquid solidifies and shrinks, making up for the loss of the feeding force due to the reduction in the volume of the split chamber, ensuring the equivalent feeding strength to the traditional full-circle side buoy. At the same time, the gradual reduction design guides the aluminum liquid to fill the rim shrinkage area first, reducing the residual ineffective aluminum liquid and further improving the material utilization rate.

[0042] Reference Figure 2-Figure 3 , a plurality of mounting grooves 33 are provided on the side mold 3, and the cooling assembly includes a plurality of rim cooling pipes 321 provided in the corresponding mounting grooves 33, and the plurality of rim cooling pipes 321 are provided around the outside of the feeding chamber 31, and the water inlet and the water outlet of the rim cooling pipe 321 penetrate the outer wall of the side mold 3. In the first embodiment, four rim cooling pipes 321 are provided. In this way, a rim cooling pipe 321 surrounding the feeding chamber 31 is provided in the mounting groove 33, and the heat dissipation rate outside the split feeding chamber 31 is precisely controlled by circulating cooling water, which is conducive to avoiding the local uneven heat dissipation caused by the continuous structure of the traditional annular cooling water channel, thereby suppressing grain coarsening and improving the mechanical properties of the rim area. At the same time, the discrete layout of the cooling pipe and the feeding chamber 31 adapts to the split thermal field distribution, thereby enhancing the cooling efficiency and feeding capacity.

[0043] Reference Figure 1 and Figure 3 The pouring system 4 includes a gate 41 and a runner 42 opened on the side mold 3. The gate 41 is funnel-shaped. The upper end of the runner 42 is connected to the lower end of the gate 41, and the lower end of the runner 42 is connected to the hub cavity 5. The cross-sectional area of ​​the runner 42 is set to decrease in a step-like or nonlinear manner along the flow direction of the aluminum liquid. In this way, when the aluminum liquid enters the runner 42 from the gate 41, the aluminum liquid filling speed is controlled by the flow resistance gradient, which is conducive to reducing the turbulence and oxidation inclusions caused by uneven flow rate of the traditional single runner 42, and at the same time adapting to the discrete liquid supply requirements of the split-type shrinkage feeding chamber 31, thereby ensuring that each shrinkage feeding chamber 31 is filled synchronously, and further improving the uniformity of the internal structure of the hub.

[0044] Embodiment 2:

[0045] The second embodiment of the present application discloses a gravity casting mold for an aluminum alloy wheel hub. Figure 4 The difference between the second embodiment and the first embodiment is that the gravity casting mold further includes a pressurizing mechanism 6 disposed above the side mold 3, and the pressurizing mechanism 6 is used to squeeze the aluminum liquid in the feeding chamber 31. The second embodiment applies continuous pressure to the aluminum liquid in the feeding chamber 31, forcing the aluminum liquid to flow to the rim area in the late solidification stage, compensating for the insufficient dynamic feeding pressure that may exist in the split chamber, significantly improving the feeding effect, reducing the internal porosity, and avoiding the passivity of the traditional solution that relies on natural shrinkage feeding.

[0046] Reference Figure 4 and Figure 5 The pressurizing mechanism 6 includes a sealing cover plate 61 and a thermal expansion sliding assembly 62 arranged on the sealing cover plate 61. The sealing cover plate 61 is used to close the upper end opening of the shrinkage compensation chamber 31. The thermal expansion sliding assembly 62 includes an outer sleeve 621, a microporous plate 622 and a thermal expansion body 623. The bottom of the outer sleeve 621 is closed and the top is open. The microporous plate 622 is movably arranged in the outer sleeve 621, and there is a certain friction between the microporous plate 622 and the inner side wall of the outer sleeve 621. A variable space 624 is provided between the inner bottom wall of the outer sleeve 621 and the microporous plate 622. The thermal expansion body 623 is filled in the variable space 624. An extrusion port 611 is provided on the sealing cover plate 61 for the outer sleeve 621 to pass through. A fixing part 612 is fixed on the sealing cover plate 61, and the microporous plate 622 is connected to the fixing part 612. In the second embodiment, the fixing member 612 is a fixing frame, and the microporous plate 622 is fixedly connected to the fixing frame by a connecting rod 6121. The connecting rod 6121 is a spring rod, which can buffer the sudden change of thermal expansion pressure, prevent excessive shrinkage compensation, and avoid the microporous plate 622 from being stuck or sealing failure caused by the rigid connection; in addition, the elastic restoring force of the spring rod balances the friction between the microporous plate 622 and the inner wall of the outer sleeve 621, ensuring that the microporous plate 622 can be stably reset after the thermal expansion body 623 cools and shrinks, maintaining the reliability of the cyclic use of the pressurizing mechanism 6, thereby achieving dynamic balance and structural self-recovery of the shrinkage compensation pressure without the need for external control.

[0047] After aluminum liquid is injected into the feeding chamber 31 for feeding, the sealing cover plate 61 is pressed onto the side mold 3 and the upper mold 1, so as to close the upper end opening of the feeding chamber 31. After the thermal expansion sliding component 62 contacts the aluminum liquid in the feeding chamber 31, heat transfer occurs. By utilizing the thermal expansion characteristics of the thermal expansion sliding component 62, during the solidification process of the aluminum liquid, the thermal expansion body 623 is thermally expanded to push the outer sleeve 621 downward, and the aluminum liquid pressure in the feeding chamber 31 is automatically adjusted to achieve dynamic feeding that matches the solidification process. No external power control is required, and compared with the traditional mechanical pressurizing mechanism 6, the structure is simplified and the response stability is improved. At the same time, the friction design of the microporous plate 622 and the outer sleeve 621 buffers pressure mutations to prevent rim deformation caused by excessive feeding.

[0048] Reference Figure 5 The thermal expansion body 623 is an expanded ceramic particle or an expanded graphite particle, and the particle size of the thermal expansion body 623 is larger than the micropore size on the microporous plate 622. In the second embodiment, the thermal expansion body 623 adopts high temperature resistant ceramic porous particles, and utilizes its high temperature resistance and stable thermal expansion coefficient to ensure that the pressure mechanism 6 can work stably for a long time in a high temperature casting environment, avoid the performance degradation of traditional metal thermal expansion materials due to oxidation or creep, and thus maintain the controllability of the shrinkage feeding pressure.

[0049] Reference Figure 5A high temperature resistant sealing ring 6111 is arranged on the inner wall of the extrusion port 611, and the outer wall of the outer sleeve 621 is tightly matched with the inner ring of the high temperature resistant sealing ring 6111. By arranging the high temperature resistant sealing ring 6111 on the inner side of the extrusion port 611 and tightly matching with the outer sleeve 621, aluminum liquid leakage or gas infiltration is prevented, and the sealing during the pressurization process is ensured. At the same time, the sealing ring is designed to withstand high temperature environments, avoiding the frequent maintenance problems caused by thermal fatigue of traditional sealing structures.

[0050] Embodiment three:

[0051] Embodiment 3 of the present application discloses a gravity casting mold for an aluminum alloy wheel hub. Figure 1 and Figure 6 , the difference between the third embodiment and the first embodiment is that: a plurality of receiving grooves 21 are provided on the top of the lower mold 2, and a chimeric block 22 is provided in the sliding seal in the receiving groove 21, and the chimeric block 22 is connected to the lifting device 7. In the third embodiment, there are four receiving grooves 21, and the four receiving grooves 21 are arranged in a circumferential array along the circumference of the hub cavity 5. The balanced lifting force is applied synchronously through the evenly distributed lifting points, which is conducive to avoiding the deformation of the hub or the problem of local mold sticking caused by one-sided demoulding. At the same time, the annular structural characteristics of the hub are adapted, so that the lifting rod 73 acts accurately on the high-rigidity area at the root of the spoke, reducing the risk of indentation in the thin-walled area; in addition, the circumferential array design significantly reduces the risk of jamming caused by local stress concentration and thermal expansion deformation of the mold by evenly dispersing the demoulding reaction force, improves the demoulding stability and mold life, and relies on the uniform layout to achieve rapid linkage of the lifting device 7, shorten the demoulding cycle, and thus optimize production efficiency and product quality.

[0052] Reference Figure 6 The lifting device 7 includes a lifting drive module 71 and a lifting plate 72 fixed to the output end of the lifting drive module 71. The lifting plate 72 is arranged at the lower side of the lower mold 2. A plurality of lifting rods 73 corresponding to the interlocking blocks 22 are fixed on the top of the lifting plate 72. A avoidance hole 23 for the corresponding lifting rod 73 to pass through is opened at the lower end of the lower mold 2. The avoidance hole 23 is connected with the corresponding accommodating groove 21. The top of the lifting rod 73 passes through the avoidance hole 23 and is connected with the corresponding interlocking block 22. The lifting rod 73 is a hollow rod and a bottom cooling member 731 is arranged inside the lifting rod 73. In the third embodiment, the bottom cooling member 731 is a cooling water pipe. The water inlet end of each bottom cooling member 731 is synchronously fed with water, and the water outlet end is synchronously discharged to ensure a synchronous and uniform cooling effect.

[0053] When the hub cavity 5 is cooled and solidified, a slidable interlocking block 22 and a lifting device 7 are arranged on the top of the lower mold 2. During demolding, the interlocking block 22 is pushed upward by the lifting rod 73 to evenly apply force, eliminating the rigid pulling of mold separation in traditional demolding. In addition, a bottom cooling member 731 is arranged inside the lifting rod 73, and the hollow rod structure is used to synchronously cool the bottom of the hub during the lifting process, accelerate the solidification of this area and reduce the temperature difference with the rim area, reduce the dimensional deviation caused by residual stress, and at the same time, the bottom cooling member 731 and the lateral cooling assembly 32 form a synergistic heat dissipation network, thereby optimizing the overall cooling uniformity.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gravity casting mold for an aluminum alloy wheel hub, comprising an upper mold (1), a lower mold (2) and a side mold (3), wherein the upper mold (1), the lower mold (2) and the side mold (3) are combined to form a wheel hub cavity (5), characterized in that: The inner side of the side mold (3) is provided with a plurality of shrinkage-feeding chambers (31) distributed along the circumference of the hub cavity (5), and each of the shrinkage-feeding chambers (31) is respectively connected to the top rim area of ​​the hub cavity (5). The side mold (3) is also provided with a lateral cooling component (32), and the lateral cooling component (32) is distributed on the outer side of the shrinkage-feeding chamber (31).

2. The aluminum alloy wheel hub gravity casting mold according to claim 1, characterized in that: The cross-sectional area of ​​the feeding chamber (31) is gradually reduced from top to bottom.

3. The aluminum alloy wheel gravity casting mold according to claim 1, characterized in that: The side mold (3) is provided with a plurality of mounting grooves (33), and the cooling assembly comprises a plurality of rim cooling pipes (321) arranged in corresponding mounting grooves (33). The plurality of rim cooling pipes (321) are arranged around the outer side of the shrinkage feeding chamber (31), and the water inlet and the water outlet of the rim cooling pipe (321) penetrate the outer wall of the side mold (3).

4. The aluminum alloy wheel gravity casting mold according to claim 1, characterized in that: It also includes a pressurizing mechanism (6) disposed above the side mold (3), and the pressurizing mechanism (6) is used to extrude the aluminum liquid in the shrinkage feeding chamber (31).

5. The aluminum alloy wheel gravity casting mold according to claim 4, characterized in that: The pressurizing mechanism (6) comprises a sealing cover plate (61) and a thermal expansion sliding assembly (62) arranged on the sealing cover plate (61), wherein the sealing cover plate (61) is used to seal the upper end opening of the feeding chamber (31), and the thermal expansion sliding assembly (62) comprises an outer sleeve (621), a microporous plate (622) and a thermal expansion body (623), wherein the outer sleeve (621) has a closed bottom and an open top, and the microporous plate (622) is movably arranged in the outer sleeve (621), and the microporous plate (622) is arranged in a manner such that the microporous plate (622) is movable ... There is a certain friction force between the plate (622) and the inner wall of the outer sleeve (621); a variable space (624) is provided between the inner bottom wall of the outer sleeve (621) and the microporous plate (622); the thermal expansion body (623) is filled in the variable space (624); the sealing cover plate (61) is provided with an extrusion opening (611) for the outer sleeve (621) to pass through; the sealing cover plate (61) is provided with a fixing piece (612); and the microporous plate (622) is connected to the fixing piece (612).

6. The aluminum alloy wheel gravity casting mold according to claim 5, characterized in that: The thermal expansion body (623) is expanded ceramic particles or expanded graphite particles.

7. The aluminum alloy wheel gravity casting mold according to claim 5, characterized in that: A high temperature resistant sealing ring (6111) is provided on the inner side wall of the extrusion port (611), and the outer cylinder wall of the outer sleeve (621) is tightly matched with the inner ring of the high temperature resistant sealing ring (6111).

8. The aluminum alloy wheel gravity casting mold according to claim 1, characterized in that: The top of the lower mold (2) is provided with a plurality of accommodating grooves (21), the accommodating grooves (21) are provided with sliding seals with engaging blocks (22), and the engaging blocks (22) are connected with a jacking device (7).

9. The aluminum alloy wheel gravity casting mold according to claim 8, characterized in that: The lifting device (7) comprises a lifting drive module (71) and a lifting plate (72) arranged at the output end of the lifting drive module (71); the lifting plate (72) is arranged at the lower side of the lower mold (2); a plurality of lifting rods (73) arranged one-to-one corresponding to the interlocking blocks (22) are arranged on the lifting plate (72); a avoidance hole (23) for the corresponding lifting rod (73) to pass through is provided at the lower end of the lower mold (2); the avoidance hole (23) is communicated with the corresponding accommodating groove (21); the top end of the lifting rod (73) passes through the avoidance hole (23) and is connected to the corresponding interlocking block (22); the lifting rod (73) is a hollow rod and a bottom cooling member (731) is provided inside the lifting rod (73).

10. The aluminum alloy wheel gravity casting mold according to claim 1, characterized in that: The invention also comprises a pouring system (4), wherein the pouring system (4) comprises a gate (41) and a runner (42) arranged on the side mold (3), wherein the gate (41) is funnel-shaped, the upper end of the runner (42) is connected to the lower end of the gate (41), and the lower end of the runner (42) is connected to the hub cavity (5), and the cross-sectional area of ​​the runner (42) is arranged to decrease in a step-like manner or nonlinearly decrease along the flow direction of the aluminum liquid.

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