Low-pressure casting mold for aluminum alloy wheel disc

Abstract

The utility model discloses a low-pressure casting mold for an aluminum alloy wheel disc. The low-pressure casting mold comprises an upper mold body provided with a spoke forming part and a lower mold body provided with a wheel disc window part. An upper die cooling device and a lower die cooling device are arranged above the spoke forming part and below the wheel disc window part respectively, the outlet end of the upper die cooling device and the outlet end of the lower die cooling device are each provided with a 45-degree opening, and a cooling medium can be guided to evenly cover the surface of a die. Through the arrangement of the upper die cooling device and the lower die cooling device, independent regulation and control can be achieved according to different areas, it is ensured that the cooling speed is high and uniform, the cooling efficiency is improved, through the design that the outlet end is provided with the 45-degree opening, turbulent flow and local supercooling are reduced, shrinkage porosity, segregation and other defects are reduced, and under the condition of sequential solidification, the production efficiency is improved. Uniform cooling of all parts is guaranteed, grains are refined, the mechanical performance of the spoke is improved, and the product percent of pass is guaranteed; and through the arrangement of the lubricating ball and the sliding closing device, oil does not need to be smeared and brushed manually, and the effect of saving manpower and operation time is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminum alloy wheel hub casting mould technical field especially relates to a kind of low-pressure casting mould of aluminum alloy wheel disc. BACKGROUND

[0002] In production process, molten aluminum enters injection system under pressure driving via riser tube, and fills mold cavity according to installation disc→spoke→front rim→rim→rear rim process path sequence.But spoke area is in high temperature state for a long time, and defects are easily generated, resulting in mechanical property decline.

[0003] For example, the application number CN108555267A discloses a mold for reducing defects in low-pressure casting of aluminum alloy wheels, which reduces the hot spot shrinkage defects of the wheel castings by 40%, reduces the rim porosity problem by 30%, greatly improves the yield, reduces the production cost, and ensures high-quality production of the wheels, but such structure still has the following significant defects:

[0004] 1.In the aluminum alloy wheel hub low-pressure casting production process, due to the long flow distance of molten aluminum from the pouring gate to the end, when flowing to the end, cold shut, undercast and other surface defects are easily formed due to the increase of melt temperature gradient.The spoke area, as the area closest to the injection port, has a late solidification sequence, which leads to the formation of a high-temperature hot spot of 600-650℃ in this area.Especially when the spoke is complexly shaped, the heat will be concentrated in the multi-spoke intersection or narrow area, causing difficulty in feeding, resulting in shrinkage, segregation and other defects, poor mechanical properties, and affecting product qualification rate.

[0005] 2.The mold frame reciprocally vertically moves under the action of other equipment when in use to realize the effect of mold opening and closing.In this process, the guide sleeve will rub against the guide column, causing certain wear after long-term use, so the guide column needs to be lubricated regularly, but the staff needs to tediously apply oil in the guide column and guide sleeve during lubrication, which is laborious and time-consuming. SUMMARY

[0006] The utility model aims at solving one of the technical problems existing in prior art.

[0007] The application provides a low-pressure casting mold for aluminum alloy wheel disc, which comprises an upper mold provided with a spoke forming part and a lower mold provided with a wheel disc window part; the upper part of the spoke forming part and the lower part of the wheel disc window part are respectively provided with an upper mold cooling device and a lower mold cooling device; the outlet ends of the upper mold cooling device and the lower mold cooling device are both 45-degree openings, which can guide the cooling medium to uniformly cover the surface of the mold.

[0008] Further, the upper die and the lower die are combined to form a wheel disc casting cavity, a center position of a wheel disc window part is provided with a pouring gate for pouring aluminum liquid, and a spoke forming part center position is provided with a flow dividing cone for guiding the aluminum liquid to flow smoothly and uniformly from the pouring gate to each area of the wheel disc casting cavity to form a wheel disc casting blank, which includes a center hole, a bolt hole, a mounting disc, a slope, spokes and a rim.

[0009] Further, the upper die cooling device includes PCD upper die first cooling rings, PCD upper die second cooling rings and upper die spoke cooling rings with diameters increasing in sequence, which are concentrically nested in the upper die, and the bottom ends of the PCD upper die first cooling rings, the PCD upper die second cooling rings and the upper die spoke cooling rings are provided with a plurality of outlet ends for cooling the bolt hole position, the mounting disc thicker area and the spoke respectively.

[0010] Further, the lower die cooling device includes a lower die pouring gate cooling ring, a PCD lower die cooling ring, a lower die slope cooling ring and a lower die spoke root cooling ring with diameters increasing in sequence, which are concentrically nested in the lower die, and the top ends of the lower die pouring gate cooling ring, the PCD lower die cooling ring, the lower die slope cooling ring and the lower die spoke root cooling ring are provided with a plurality of outlet ends for cooling the center hole, the mounting disc, the slope and the intersection of the spoke and the rim respectively.

[0011] Further, the mold frame is fixedly connected with the lower die, guide columns are fixedly installed on the upper die, guide sleeves are fixedly installed on the mold frame, and the guide columns and the guide sleeves are in sliding fit.

[0012] Further, the cooling medium is compressed air or water mist cooling gas.

[0013] Further, a plurality of ball grooves are arranged on the inner circumferential wall of the guide sleeve, lubricating ball bearings are rotatably installed in the ball grooves, an oil storage cavity for storing lubricating oil is arranged on the mold frame, an oil channel is arranged in communication with the ball grooves, the oil storage cavity and the oil channel are in communication through an oil outlet hole, a sliding closure device is arranged on the mold frame, and the sliding closure device can push the lubricating oil to the lubricating ball bearings.

[0014] The mold frame is provided with an oil injection hole in communication with the oil storage cavity, and an oil injection plug is detachably installed on the oil injection hole.

[0015] Further, the sliding closure device includes a cylinder, a piston block, a connecting rod and a plugging block, the piston block is slidably installed in the oil storage cavity, the plugging block is slidably installed in the oil channel, the plugging block is provided with oil holes penetrating through left and right sides, and the plugging block abuts at the connection between the oil channel and the oil outlet hole to block the oil holes.

[0016] The connecting rod is located in the oil outlet hole and is fixedly connected with the piston block and the plugging block at both ends, the cylinder is fixedly installed in the oil storage cavity, and the output shaft of the cylinder is fixedly connected with the piston block away from the oil outlet hole.

[0017] Further, the diameter of the connecting rod is less than the inner diameter of the oil outlet hole.

[0018] The beneficial effects of the present application are as follows:

[0019] 1. By setting the upper die cooling device and the lower die cooling device, different areas can be independently controlled, ensuring fast and uniform cooling speed, improving cooling efficiency, and reducing defects such as shrinkage and segregation by designing the outlet end to be 45 degrees open, ensuring uniform cooling of each part under the condition of sequential solidification, refining the grain, improving the mechanical properties of the spoke, and ensuring product yield.

[0020] 2. By setting the lubricating ball and the sliding closure device, lubricating oil can be automatically added during the relative up-and-down sliding of the guide sleeve and the guide column, eliminating the need for manual application of oil, saving labor and operation time. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a sectional view of a low-pressure casting mold for an aluminum alloy wheel disc in the embodiments of the present application;

[0022] Figure 2 is a structural schematic diagram of the upper die in the embodiments of the present application;

[0023] Figure 3 is a structural schematic diagram of the lower die in the embodiments of the present application;

[0024] Figure 4 is a structural schematic diagram of the flow divider cone in the embodiments of the present application;

[0025] Figure 5 is a structural schematic diagram of the wheel disc in the embodiments of the present application;

[0026] Figure 6 is a connection principle diagram of the guide column, guide sleeve, lubricating ball, and sliding closure device in the embodiments of the present application;

[0027] Figure 7 is Figure 6 an enlarged structural schematic diagram of position A in the embodiments of the present application.

[0028] REFERENCE NUMERALS

[0029] 1-Spoke forming section, 2-Disc window section, 3-Diverter cone, 4-Mold frame, 5-Sprue, 6-Disc casting cavity, 7-Upper mold cooling device, 71-PCD upper mold first cooling ring, 72-PCD upper mold second cooling ring, 73-Upper mold spoke cooling ring, 8-Lower mold cooling device, 81-Lower mold sprue cooling ring, 82-PCD lower mold cooling ring, 83-Lower mold ramp cooling ring, 84-Lower mold spoke root cooling ring, 91-Middle 92-Bolt hole, 93-Mounting plate, 94-Slope, 95-Spoke, 96-Wheel flange, 10-Guide sleeve, 101-Ball groove, 102-Lubricating ball, 103-Oil reservoir, 104-Oil passage, 105-Oil outlet, 11-Guide post, 12-Sliding closing device, 121-Cylinder, 122-Piston block, 123-Connecting rod, 124-Sealing block, 125-Oil hole, 13-Oil injection hole, 14-Oil injection plug. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0031] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0032] The following description, in conjunction with the accompanying drawings, details a low-pressure casting mold for an aluminum alloy wheel provided in this application through specific embodiments and application scenarios.

[0033] Example 1:

[0034] like Figures 1 to 5 As shown, this application provides a low-pressure casting mold for an aluminum alloy wheel, including an upper mold with a spoke forming part 1 and a lower mold with a wheel window part 2; an upper mold cooling device 7 and a lower mold cooling device 8 are respectively provided above the spoke forming part 1 and below the wheel window part 2, and the outlet ends of the upper mold cooling device 7 and the lower mold cooling device 8 are both open at 45 degrees, which can guide the cooling medium to evenly cover the surface of the mold.

[0035] Further, the upper die and the lower die form a wheel disc cavity 6 after closing, the center of the wheel disc window part 2 is provided with a pouring gate 5 for injecting aluminum liquid, the center of the spoke forming part 1 is provided with a flow divider 3, which can guide the aluminum liquid to flow stably and uniformly to each area of the wheel disc cavity 6 from the pouring gate 5, so as to form a wheel disc casting blank, which includes a center hole 91, a bolt hole 92, a mounting disc 93, a slope 94, a spoke 95 and a rim 96.

[0036] Further, the upper die cooling device 7 includes PCD upper die first cooling ring 71, PCD upper die second cooling ring 72 and upper die spoke cooling ring 73 with increasing diameters, which are concentrically nested in the upper die, and the bottom end of the PCD upper die first cooling ring 71, the PCD upper die second cooling ring 72 and the upper die spoke cooling ring 73 are provided with a plurality of outlet ends, which can respectively cool the bolt hole 92 position, the thicker area of the mounting disc 93 and the spoke 95.

[0037] Further, the lower die cooling device 8 includes lower die pouring gate cooling ring 81, PCD lower die cooling ring 82, lower die slope cooling ring 83 and lower die spoke root cooling ring 84 with increasing diameters, which are concentrically nested in the lower die, and the top end of the lower die pouring gate cooling ring 81, the PCD lower die cooling ring 82, the lower die slope cooling ring 83 and the lower die spoke root cooling ring 84 are provided with a plurality of outlet ends, which can respectively cool the center hole 91, the mounting disc 93, the slope 94 and the intersection of the spoke 95 and the rim 96.

[0038] Further, it also includes a mold frame 4, which is fixedly connected with the lower die, and a guide column 11 is fixedly installed on the upper die, and a guide sleeve 10 is fixedly installed on the mold frame 4, and the guide column 11 and the guide sleeve 10 are in sliding fit.

[0039] Further, the cooling medium is compressed air or water mist cooling gas.

[0040] In this embodiment of the present application, due to the adoption of the above structure, the aluminum liquid is injected into the wheel disc cavity 6 through the pouring gate 5 arranged at the center of the wheel disc window part 2, and the aluminum liquid is stably and uniformly distributed to each area of the wheel disc cavity 6 under the guidance of the flow divider 3;

[0041] The lower die pouring gate cooling ring 81 is located beside the lower die pouring gate 5, because the pouring gate 5 is the highest temperature point and the last solidification area, and when the temperature is too high, it is easy to produce defects such as shrinkage and shrinkage hole, but if the cooling is too fast, it will cause the aluminum liquid to flow due to the low temperature, resulting in incomplete filling, cold separation, porosity and other problems, so the cooling ring is moderately cooled to ensure the flowability of the aluminum liquid;

[0042] The PCD lower die cooling ring 82 is located below the mounting disc 93, the PCD upper die first cooling ring 71 and the PCD2 cooling ring are located above the mounting disc 93, and the three cooling rings work together to ensure uniform cooling at the mounting disc 93;

[0043] The lower die slope cooling ring 83 is located below the slope 94 at the junction of the mounting disc 93 and the spoke 95, which can ensure uniform cooling at the slope 94;

[0044] The upper die spoke cooling ring 73 is located above the spoke 95, which can ensure uniform cooling at the spoke 95;

[0045] The lower die spoke root cooling ring 84 is located below the junction of the spoke 95 and the rim 96, which can cool this area to avoid defects such as shrinkage and porosity due to the thickness of this area;

[0046] The PCD upper die first cooling ring 71, the PCD upper die second cooling ring 72, and the bottom end of the upper die spoke cooling ring 73 are each provided with a plurality of outlet ends corresponding to their respective cooling positions. The cooling device is in communication with the PCD upper die first cooling ring 71, the PCD upper die second cooling ring 72, and the upper die spoke cooling ring 73, and can push the cooling medium through pressure to form a columnar jet at the outlet end, covering the mold surface;

[0047] The top end of the lower die casting gate cooling ring 81, the PCD lower die cooling ring 82, the lower die slope cooling ring 83, and the lower die spoke root cooling ring 84 are each provided with a plurality of outlet ends corresponding to their respective cooling positions. The cooling device is in communication with the lower die casting gate cooling ring 81, the PCD lower die cooling ring 82, the lower die slope cooling ring 83, and the lower die spoke root cooling ring 84, and can push the cooling medium through pressure to form a columnar jet at the outlet end, covering the mold surface;

[0048] The outlet ends are each a 45-degree opening. The 45-degree opening can increase the outlet cross-sectional area, disperse the pressure impacting the mold surface, and not easily form turbulence. It can also guide the cooling medium to one side of the opening direction under the action of pressure, enhancing the cooling strength on that side, which is beneficial to the sequential solidification of the disc and improves the quality of the disc;

[0049] The mold frame 4 is fixedly connected with the lower die, the guide column 11 is fixedly installed on the upper die, the guide sleeve 10 is fixedly installed on the mold frame 4, the guide column 11 and the guide sleeve 10 are in sliding fit, the upper die seat of the mold frame 4 drives the upper die to move up and down along the guide column 11 and the guide sleeve 10, ensuring precise closing and opening of the upper die and the lower die, and completing precise opening and closing movements.

[0050] Example 2:

[0051] As Figure 6 With Figure 7As shown, in this embodiment, in addition to the structural features of the preceding embodiments, a plurality of ball grooves 101 are arranged on the inner circumferential wall of the guide sleeve 10, and a lubricating ball 102 is rotatably arranged in each ball groove 101. The mold frame 4 is provided with an oil storage cavity 103 for storing lubricating oil, an oil channel 104 connected to the ball grooves 101, and the oil storage cavity 103 and the oil channel 104 are connected through an oil outlet hole 105. The mold frame 4 is provided with a sliding closure device 12, which can push the lubricating oil to the lubricating ball 102. The mold frame 4 is provided with an oil injection hole 13 connected to the oil storage cavity 103, and an oil injection plug 14 is detachably arranged on the oil injection hole 13.

[0052] Further, the sliding closure device 12 includes a cylinder 121, a piston block 122, a connecting rod 123, and a plugging block 124. The piston block 122 is slidably arranged in the oil storage cavity 103, and the plugging block 124 is slidably arranged in the oil channel 104. The plugging block 124 is provided with a left-right penetrating oil hole 125, and the plugging block 124 abuts at the connection between the oil channel 104 and the oil outlet hole 105 to block the oil hole 125. The connecting rod 123 is located in the oil outlet hole 105 and is fixedly connected to the piston block 122 and the plugging block 124 at both ends. The cylinder 121 is fixedly arranged in the oil storage cavity 103, and the output shaft of the cylinder 121 is fixedly connected to the piston block 122 away from the oil outlet hole 105.

[0053] Further, the diameter of the connecting rod 123 is smaller than the inner diameter of the oil outlet hole 105.

[0054] In this embodiment of the present application, due to the adoption of the above structure, the guide column 11 and the guide sleeve 10 are slidably connected through a plurality of lubricating balls 102. When it is necessary to lubricate the guide column 11, the piston block 122 is pushed by the cylinder 121 to slide in the direction of the oil outlet hole 105, the piston block 122 drives the connecting rod 123 and the plugging block 124 to slide synchronously, and then the plugging block 124 is separated from the connection between the oil channel 104 and the oil outlet hole 105, at this time the oil hole 125 is in an open state, and then the piston block 122 slides to push the lubricating oil in the oil storage cavity 103 to pass through the oil outlet hole 105, the oil hole 125, and the oil channel 104 in sequence, and then enter the ball grooves 101. The lubricating oil in the ball grooves 101 adheres to the lubricating balls 102. When the guide column 11 and the guide sleeve 10 slide up and down relative to each other, the lubricating balls 102 roll and smear the lubricating oil on the guide column 11. When the guide column 11 is lubricated, the piston block 122 is driven by the cylinder 121 to slide in the direction of the cylinder 121, the piston block 122 drives the connecting rod 123 and the plugging block 124 to slide synchronously, and then the plugging block 124 abuts at the connection between the oil channel 104 and the oil outlet hole 105 to block the oil hole 125.

[0055] Before controlling the upper mold to slide up and down, the external program will first start the cylinder 121 to lubricate the guide column 11;

[0056] The cylinder 121 is a self-locking cylinder, which can stably keep the sealing block 124 abutting against the connection of the oil passage 104 and the oil outlet hole 105;

[0057] The mold frame 4 is provided with an oil injection hole 13 communicated with the oil storage cavity 103, and an oil injection plug 14 is threadedly installed on the oil injection hole 13, which can be removed and the lubricating oil can be added into the oil storage cavity 103 through the oil injection hole 13;

[0058] The piston block 122 is provided with a ring groove, and a sealing ring is installed in the ring groove, which can avoid the lubricating oil flowing to the cylinder 121.

[0059] It should be noted that in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that includes the recited element. Additionally, it should be noted that the scope of the methods and apparatus of the present embodiments are not limited by the order of the steps or the sequence for performing the steps, and can include performing the steps in different order, or concurrently, or in reverse order, or omitting one or more steps, or adding one or more steps, as appropriate, to the process, method, article, or apparatus being described. In addition, features described in relation to certain examples can be combined in other examples.

[0060] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are only illustrative, rather than limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims, which are all within the protection of the present application.

Claims

1. A low pressure casting mold for an aluminum alloy wheel disk comprising an upper mold provided with a spoke forming portion and a lower mold provided with a disk window portion, characterized in that, The upper and lower sides of the spoke forming part and the wheel disc window part are respectively provided with an upper mold cooling device and a lower mold cooling device, and the outlet ends of the upper mold cooling device and the lower mold cooling device are respectively opened at an angle of 45 degrees, so as to guide the cooling medium to uniformly cover the surface of the mold.

2. A low pressure casting mold for an aluminum alloy wheel disk according to claim 1, characterized by, The upper and lower molds are combined to form a wheel disc casting cavity, the center of the wheel disc window part is provided with a pouring opening for pouring aluminum liquid, and the center of the spoke forming part is provided with a flow dividing cone for guiding the aluminum liquid to be smoothly and uniformly divided from the pouring opening to each area of the wheel disc casting cavity, so as to form a wheel disc casting blank, and the wheel disc casting blank comprises a center hole, a bolt hole, a mounting disc, a slope, spokes and a rim.

3. A low pressure casting mold for an aluminum alloy wheel disc according to claim 2, wherein The upper mold cooling device comprises a PCD upper mold first cooling ring, a PCD upper mold second cooling ring and an upper mold spoke cooling ring with increasing diameters, which are concentrically nested in the upper mold, and the bottom ends of the PCD upper mold first cooling ring, the PCD upper mold second cooling ring and the upper mold spoke cooling ring are respectively provided with a plurality of outlet ends for cooling the bolt hole position, the thicker area of the mounting disc and the spoke.

4. The low pressure casting mold for an aluminum alloy wheel disk according to claim 2, characterized by The lower mold cooling device comprises a lower mold pouring opening cooling ring, a PCD lower mold cooling ring, a lower mold slope cooling ring and a lower mold spoke root cooling ring with increasing diameters, which are concentrically nested in the lower mold, and the top ends of the lower mold pouring opening cooling ring, the PCD lower mold cooling ring, the lower mold slope cooling ring and the lower mold spoke root cooling ring are respectively provided with a plurality of outlet ends for cooling the center hole, the mounting disc, the slope and the joint of the spoke and the rim.

5. The low pressure casting mold for an aluminum alloy wheel disk according to claim 1, characterized by, The mold frame is fixedly connected with the lower mold, the guide column is fixedly installed on the upper mold, the guide sleeve is fixedly installed on the mold frame, and the guide column and the guide sleeve are in sliding fit.

6. A low pressure casting mold for an aluminum alloy wheel disc according to claim 1, wherein The cooling medium is compressed air or water mist cooling gas.

7. The low pressure casting mold for an aluminum alloy wheel disk according to claim 5, characterized by A plurality of ball grooves are arranged on the inner circumferential wall of the guide sleeve, a lubricating ball is rotatably installed in each ball groove, an oil storage cavity for storing lubricating oil is arranged on the mold frame, and an oil channel is in communication with the ball grooves. The mold frame is provided with an oil injection hole in communication with the oil storage cavity, and an oil injection plug is detachably installed on the oil injection hole.

8. A low pressure casting mold for an aluminum alloy wheel disc according to claim 7, characterized by, The sliding closure device comprises a cylinder, a piston block, a connecting rod and a plugging block, the piston block is slidably installed in the oil storage cavity, the plugging block is slidably installed in the oil channel, the plugging block is provided with an oil hole penetrating through left and right sides, and the plugging block abuts at the connection between the oil channel and the oil outlet hole to block the oil hole. The connecting rod is located in the oil outlet hole and is fixedly connected with the piston block and the plugging block at both ends, the cylinder is fixedly installed in the oil storage cavity, and the output shaft of the cylinder is fixedly connected with the piston block away from the oil outlet hole.

9. A low pressure casting mold for an aluminum alloy wheel disc according to claim 8, wherein The diameter of the connecting rod is smaller than the inner diameter of the oil outlet hole.

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