Casting mold for aluminum wheel hub and casting method thereof

Abstract

The present invention discloses a casting mold for an aluminum wheel hub, wherein the upper mold is fixedly connected to the upper mold core and the upper connecting plate respectively, the core mold ring is formed by a plurality of slider core modules distributed circumferentially around the middle core mold, and the slider core module is detachably connected to the middle core mold; the ejection ring is fixedly connected to the ejection plate; the bottom plate is fixedly connected to the lower mold plate, and the lower mold, the lower mold insert assembly and the core mold assembly are fixedly connected to the lower mold plate; the gate assembly is located above the upper mold core, and the gate assembly is provided with a gate and a runner; the upper mold, the upper mold core, the core mold assembly, the ejection ring, the lower mold and the lower mold insert assembly together form a mold cavity of the aluminum wheel hub, and the gate and the runner are connected to the mold cavity of the aluminum wheel hub. The above mold can directly obtain the wheel hub oil storage cavity by casting, thereby reducing the overall cost. The aluminum wheel hub casting method of the present invention adopts gravity plus medium-pressure air energy casting, and aluminum liquid is poured from the top of the mold. The filling pressure is relatively high, which can play a certain shrinkage compensation role, and the wheel hub has good density, and the product has high strength and good performance.

Description

Technical Field

[0001] The invention belongs to the technical field of wheel hubs, and in particular relates to a casting mould of an aluminium wheel hub and a method for casting the aluminium wheel hub. Background Art

[0002] With the rapid growth of China's economy, high-end logistics represented by e-commerce, hazardous chemicals, cold chain, etc. has developed rapidly, and the requirements for lightweight vehicles have become more prominent. Taking a tractor as an example (running about 200,000 kilometers per year), every 1Kg weight reduction can earn nearly 200 yuan more in freight each year; therefore, the demand for lightweighting by commercial vehicle users and vehicle manufacturers is imminent.

[0003] Compared with ductile iron, the material of traditional commercial vehicle wheels, the density of aluminum is about 1 / 3 of that of ductile iron, which makes it easier to ensure the dynamic balance of the product and has a good anti-shake effect on the vehicle. In addition, the product is light in weight and not easy to rust, which has a good promoting effect on energy conservation and emission reduction. The good performance of aluminum alloy can also ensure the corresponding fatigue strength and hardness of the wheel hub, so using aluminum alloy instead of cast iron will become an important method for lightweighting the wheel hub.

[0004] However, the corresponding fatigue strength and hardness of the wheel hub must be maintained at the same time. The tempering treatment of the aluminum alloy wheel hub is a good means to ensure the strength. The mold originally used to manufacture traditional wheels is not suitable for casting aluminum alloy wheels. Therefore, it is necessary to invent a casting mold for aluminum wheels to adapt to the development of lightweight wheels.

[0005] In addition, existing aluminum alloy wheels usually adopt low-pressure sand casting methods. The wheel hub molding pressure is low, and it is easy to have problems such as shrinkage and sand sticking. Moreover, the position of the wheel hub oil storage cavity cannot be obtained directly by casting. After casting is completed, the position of the blank oil storage cavity needs to be machined to obtain the wheel hub oil cavity. However, before machining the wheel hub oil cavity, the wheel hub blank needs to be solution treated and aging treated. Since the wall thickness of the oil storage cavity of the unprocessed blank is thick, insufficient solution treatment and aging treatment may result in coarse grains, resulting in poor product performance and waste of materials and tools. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the first technical problem to be solved by the present invention is to provide a casting mold for an aluminum wheel hub, which can directly obtain the wheel hub oil storage cavity by casting. The wheel hub oil storage cavity does not need to be further processed, thus saving casting cost and processing cost, and adapting to the development of lightweight wheel hub.

[0007] To solve the first technical problem, the present invention adopts the following technical solutions:

[0008] A casting mold for an aluminum wheel hub, characterized by comprising:

[0009] An upper mold assembly, the upper mold assembly comprising an upper mold, an upper mold core and an upper connecting plate, the upper mold being fixedly connected to the upper mold core and the upper connecting plate respectively,

[0010] A core mold assembly, the core mold assembly comprising an intermediate core mold and a core mold ring, the core mold ring being formed by a plurality of slider core modules distributed circumferentially around the intermediate core mold, the slider core modules being detachably connected to the intermediate core mold;

[0011] An auxiliary molding assembly, the auxiliary molding assembly comprising an ejection ring and an ejection plate, the ejection ring and the ejection plate being fixedly connected;

[0012] A lower mold assembly, the lower mold assembly comprising a bottom plate, a lower mold plate, a lower mold, and a lower mold insert assembly, the bottom plate is fixedly connected to the lower mold plate, and the lower mold plate is fixedly connected to the lower mold plate, the lower mold insert assembly and the core mold assembly;

[0013] A gate assembly, the gate assembly is located above the upper mold core, and the gate assembly is provided with a gate and a runner;

[0014] The upper mold, the upper mold core, the core mold assembly, the ejection ring, the lower mold and the lower mold insert assembly together form a mold cavity of the aluminum wheel hub, and the gate and the runner are connected to the mold cavity of the aluminum wheel hub.

[0015] Preferably, each of the slider core modules is provided with two contact side surfaces abutting against other slider core modules, and at least one of the slider core modules is provided with draft angles on its two contact side surfaces.

[0016] Preferably, a plurality of the slider core modules are plugged and fixed to the middle core mold.

[0017] Preferably, the middle core mold is provided with a middle through hole for the diverter cone assembly to pass through, and the middle core mold is provided with a plug-in groove for the slider core module to be plugged in.

[0018] Preferably, the plug-in groove is configured as an annular slot opened on the outer peripheral surface of the middle core mold, and a downwardly protruding arc-shaped plug-in joint is provided at the bottom of each of the slider core modules, and the arc-shaped plug-in joint is adapted to the annular slot.

[0019] Preferably, the plug-in grooves are provided in plurality and are arranged at intervals at the top end of the middle core mold, and the plurality of the plug-in grooves are evenly distributed along the circumference of the top end of the middle core mold, and a radial plug-in connector protruding radially is provided inside each of the slider core modules, and the radial plug-in connector is adapted to the plug-in grooves.

[0020] Preferably, the lower mold insert assembly includes a lower mold insert ring and a plurality of bolt hole locating pins, the lower mold insert ring is fixedly connected to the lower mold plate, the plurality of bolt hole locating pins are fixed on the lower mold insert ring, the lower mold insert ring is provided with a positioning and mounting groove for installing the intermediate core mold, the bottom of the intermediate core mold is provided with a plug-in portion adapted to the positioning and mounting groove, and the intermediate core mold is fixedly connected to the lower mold insert ring.

[0021] Preferably, the auxiliary molding assembly includes a push rod, the push rod moves up and down along the guide hole on the bottom plate, and the push rod is fixedly connected to the ejection plate;

[0022] The gate assembly includes a gate inner sleeve and a gate outer sleeve, the gate outer sleeve is provided with the gate and an installation cavity for accommodating the gate inner sleeve, the gate inner sleeve is provided with the runner, and the bottom end of the gate outer sleeve is fixedly connected to the upper mold core.

[0023] As the same inventive concept, another technical problem to be solved by the present invention is to provide a wheel hub casting method, so that the aluminum wheel hub has good density and high strength, and the wheel hub oil storage cavity can be directly obtained by casting.

[0024] To solve the second technical problem, the present invention adopts the following technical solutions:

[0025] A method for casting an aluminum wheel hub using the above-mentioned casting mold of the aluminum wheel hub comprises the following steps:

[0026] a) Raw material processing: Use a spectrometer to test the chemical composition of the aluminum raw materials, melt the raw materials, remove impurities and slag from the molten liquid after smelting, test the chemical composition and temperature of the molten liquid, ensure that the temperature of the molten liquid is 740℃-750℃, and use the molten liquid that has passed the test as casting liquid for standby use;

[0027] b) Mold pretreatment: at the same time as step a), the casting mold of the aluminum wheel hub is preheated to control the temperature within the range of 410±20°, the mold cavity is sprayed with paint with a thickness of ≤0.5mm, a filter is set at the mold gate and the pressure in the mold cavity is tested to ensure that the pressure in the cavity is ≥0.5Mpa;

[0028] c) Pouring: The casting liquid in step a) is injected into the cavity of the casting mold of the aluminum wheel hub from the top gate assembly, ensuring that the pouring amount is sufficient and the excess material is cleaned in time. It is necessary to ensure that each piece is poured and cleaned within 15-30 seconds. During pouring, the pouring temperature is maintained at 730℃-740℃. After the pouring is completed, the pressure is maintained for 400 seconds and the pressure in the cavity is ensured to be ≥0.5Mpa;

[0029] d) Cooling: While the bottom of the mold is cooling, the top of the mold is heated to maintain the top temperature at 200°C-350°C. The cooling time is 550 seconds from the start of pouring;

[0030] e) Take out the aluminum wheel hub blank and slider core module: remove the pouring head, take out the aluminum wheel hub blank, and then take out the slider core module in order. It is necessary to select the slider core module with draft angles on both contact sides, then take out the slider core module with a draft angle on one side, and finally take out the remaining slider core modules.

[0031] Preferably, in step c), after pouring is completed, the pressure is maintained for 400 seconds and the pressure in the cavity is ensured to be 0.5 MPa-1.5 MPa.

[0032] After adopting the above technical solution, the beneficial effects of the present invention are:

[0033] The aluminum wheel hub casting mold of the present invention invents a core mold assembly that can directly obtain the wheel hub oil storage cavity by casting. The oil storage cavity directly obtained by casting has a thinner wall thickness, which is conducive to refining grains through solution treatment and aging treatment, saving casting materials, and reducing machining steps, thereby reducing overall costs.

[0034] The core mold ring is formed by a plurality of slider core modules distributed circumferentially around the middle core mold. The slider core modules are detachably connected to the middle core mold, so that the core mold assembly can be recycled.

[0035] Each slider core module is provided with two contact side surfaces which are in contact with other slider core modules, and at least one slider core module is provided with draft angles on its two contact side surfaces. After the casting is completed, the slider core module with draft angles on its two contact side surfaces is taken out first, and then the other slider core modules are taken out. This saves time and effort compared to cleaning the traditional wheel hub inner cavity, and improves the wheel hub production efficiency.

[0036] The casting method used by the aluminum hub casting mold of the present invention has higher strength and is not easy to stick to sand than the original low-pressure sand casting. The aluminum hub casting method of the present invention adopts gravity plus medium-pressure air energy casting. The molten aluminum is poured from the top of the mold. After the pouring is completed, a pressure of ≥0.5Mpa, usually 0.5-1.5MPa, is applied to the cavity. The filling pressure is relatively high and can play a certain shrinkage compensation role. The hub has good density, the product density is about 2.77-2.79g.cm, the process yield rate is greater than 85%, and the product has high strength and good performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural diagram of the aluminum wheel hub of the wheel hub unit of the present invention after the casting mold is closed;

[0038] Figure 2 It is a schematic structural diagram of the aluminum hub of the hub unit of the present invention after the casting mold is opened;

[0039] Figure 3 yes Figure 1 A schematic structural diagram of a first embodiment of a central core mold assembly;

[0040] Figure 4 yes Figure 3 Exploded diagram of the core mold assembly;

[0041] Figure 5 yes Figure 3 Schematic diagram of the core mold ring of the central core mold assembly;

[0042] Figure 6 yes Figure 1 A schematic structural diagram of the second embodiment of the central core mold assembly;

[0043] Figure 7 yes Figure 6 Exploded diagram of the core mold assembly;

[0044] Figure 8 yes Figure 6 Schematic diagram of the core mold ring of the central core mold assembly;

[0045] In the figure: 1-upper mold assembly, 11-upper mold, 12-upper mold core, 13-upper connecting plate, 2-core mold assembly, 21-middle core mold, 211-annular slot, 22-core mold ring, 221-slider core module, 221a-first slider core module, 221b-second slider core module, 221c-third slider core module, 221d-fourth slider core module, 221e-fifth slider core module, 221a1-first arc plug joint, 221b1-second arc plug joint, 221c1-third arc plug joint, 221d1-fourth arc plug joint, 221e1-fifth arc plug joint, 23-middle core mold, 24-core mold ring, 241-slider core module, 241a-first slider core module, 241b-second slider core module, 241c-the third slider core module, 241d-the fourth slider core module, 241e-the fifth slider core module, 241a1-the first radial plug connector, 241b1-the second radial plug connector, 241c1-the third radial plug connector, 241d1-the fourth radial plug connector, 241e1-the fifth radial plug connector, 3-the auxiliary molding component, 31-the ejection ring, 32-the ejection plate, 4-the lower mold component, 41-the bottom plate, 42-the lower mold plate, 43-the lower mold, 44-the lower mold insert component, 441-the lower mold insert ring, 442-the bolt hole locating pin, 5-the gate assembly component, 51-the gate jacket, 511-the gate, 52-the gate inner sleeve, 521-the runner, 6-the diverter cone assembly, 61-the diverter cone support rod, 62-the diverter cone, and L-the hub blank. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0047] Embodiment 1:

[0048] like Figure 1 and Figure 3 The casting mold of the aluminum wheel hub shown in the figure, the upper mold assembly 1 includes an upper mold 11, an upper mold core 12 and an upper connecting plate 13, and the upper mold 11 is fixedly connected to the upper mold core 12 and the upper connecting plate 13 by bolts.

[0049] The core mold assembly 2 includes an intermediate core mold 21 and a core mold ring 22. The core mold ring is used to form the oil cavity of the hub blank L. The core mold ring 22 is formed by a plurality of slider core modules 221 distributed circumferentially around the intermediate core mold 21. The slider core modules 221 are detachably connected to the intermediate core mold 21.

[0050] The auxiliary molding assembly 3 includes a push-out ring 31 and an ejector plate 32, and the push-out ring 31 and the ejector plate 32 are fixedly connected;

[0051] The lower mold assembly 4 includes a bottom plate 41, a lower mold plate 42, a lower mold 43, and a lower mold insert assembly 44. The bottom plate 41 is fixedly connected to the lower mold plate 42, and the lower mold 43, the lower mold insert assembly 44 and the core mold assembly 2 are fixedly connected to the lower mold plate 42;

[0052] The gate assembly 5 is located above the upper mold core 12, and the gate assembly is provided with a gate 511 and a runner 521;

[0053] The upper mold 11, the upper mold core 12, the core mold assembly 2, the ejection ring 31, the lower mold 43 and the lower mold insert assembly 44 together form a mold cavity of the aluminum wheel hub, and the gate 511 and the runner 521 are connected to the mold cavity of the aluminum wheel hub.

[0054] During traditional wheel hub mold casting, the oil cavity of the wheel hub blank is not filled with the core mold component, but is filled with the casting melt. After casting, the wheel hub blank requires solution treatment and aging treatment, and then the oil storage cavity position of the blank needs to be reprocessed. Since the wall thickness of the oil storage cavity of the unprocessed blank is relatively thick, insufficient solution treatment and aging treatment may result in coarse grains and waste of materials and tools.

[0055] The wheel hub mold of the present invention can directly cast the wheel hub oil storage cavity position, and the oil cavity wall thickness is relatively thin, which is conducive to solution treatment and aging treatment to refine grains, save casting materials, reduce machining steps, and reduce overall costs.

[0056] A plurality of slider core modules 221 are plugged and fixed to the middle core mold 21. The middle core mold 21 is provided with a middle through hole for the diverter cone assembly to pass through, the diverter cone assembly 6 comprises a diverter cone support rod 61 and a diverter cone 62 fixed on the top of the diverter cone support rod, the middle core mold 21 is sleeved on the outside of the diverter cone assembly, and the middle core mold 21 is provided with a plug-in slot for the slider core module 221 to be plugged in.

[0057] like Figures 3 to 5 As shown, the slider core module 221 includes a first slider core module 221a, a second slider core module 221b, a third slider core module 221c, a fourth slider core module 221d and a fifth slider core module 221e which are arranged in sequence along the clockwise direction. The plug-in groove on the middle core mold 21 is arranged as an annular slot 211 opened on the outer circumferential surface of the middle core mold 21. The bottom of each slider core module is provided with an arc-shaped plug-in joint protruding downward, that is, the first slider core module 221a is provided with a first arc-shaped plug-in joint 221a1, the second slider core module 221b is provided with a second arc-shaped plug-in joint 221b1, the third slider core module 221c is provided with a third arc-shaped plug-in joint 221c1, the fourth slider core module 221d is provided with a fourth arc-shaped plug-in joint 221d1, and the fifth slider core module 221e is provided with a fifth arc-shaped plug-in joint 221e1, and the above-mentioned arc-shaped plug-in joints are plugged into the annular slot 211. The shape of the slider core module 221 is set according to the shape of the wheel hub oil cavity to prevent the slider core module 221 from tipping over during casting, but to ensure that the center of gravity of the slider core module 221 is located above the concave annular slot 211 of the middle core mold.

[0058] Each slider core module is provided with two contact side surfaces that are in contact with other slider core modules, and at least one slider core module has two contact side surfaces provided with draft angles. For example, in this embodiment, two contact side surfaces of the first slider core module 221a are provided with draft angles, and the draft angle is preferably set to 3°. Correspondingly, one contact side surface of the second slider 221b and one contact side surface of the fifth slider 221e that are in contact with the first slider core module 221a are also provided with draft angles. The above-mentioned setting method facilitates the removal of the slider core module 221 from the oil cavity of the hub blank after the hub blank is removed from the hub mold. In addition, the slider core module 221 is preferably made of metal, which, on the one hand, facilitates the slider core module 221 to be repeatedly recycled, and on the other hand, during the casting pressure application process, the slider core module 221 will not be crushed by pressure like a sand core.

[0059] The lower mold insert assembly 44 includes a lower mold insert ring 441 and a plurality of bolt hole locating pins 442. The bolt hole locating pins 442 are used to form the bolt holes on the bottom end surface of the wheel hub. The lower mold insert ring 441 is fixedly connected to the lower mold plate 42. The plurality of bolt hole locating pins 442 are fixed on the lower mold insert ring 441. The lower mold insert ring 441 is provided with a positioning and installation groove for installing the intermediate core mold 21. The bottom of the intermediate core mold 21 is provided with a plug-in portion adapted to the positioning and installation groove. The intermediate core mold 21 is fixedly connected to the lower mold insert ring 441.

[0060] The auxiliary molding assembly 3 includes a push rod 33, which moves up and down along the guide hole on the bottom plate 41, and the push rod 33 is fixedly connected to the ejector plate 32; when the mold is opened, the push rod 33 pushes the ejector plate 32 and the ejection ring 31 to move upward, and the ejection ring 31 will drive the wheel hub blank L and the core mold ring 22 in the oil cavity to move upward.

[0061] The gate assembly 5 includes a gate inner sleeve 52 and a gate outer sleeve 51 . The gate outer sleeve 51 is provided with a gate 511 and an installation cavity for accommodating the gate inner sleeve 52 . The gate inner sleeve 52 is provided with a runner 521 . The bottom end of the gate outer sleeve 51 is fixedly connected to the upper mold core 12 .

[0062] Mould opening process:

[0063] When the mold is opened, the upper mold assembly 1 and the gate assembly 5 move upward, and then the push rod 33 of the auxiliary molding assembly 3 pushes the ejector plate 32, the ejection ring 31, the hub blank L and the core mold ring 22 in the oil cavity upward, so that the hub blank L is ejected, and at the same time, the core mold ring 22 and the middle core mold 21 are disengaged. After complete cooling, multiple slider core modules 221 are taken out from the oil cavity of the hub blank L in sequence. In this embodiment, the order of taking out the above five slider core modules is: first take out the first slider core module 221a, then take out the second slider core module 221b and / or the fifth slider 221e, and finally take out the third slider core module 221c and / or the fourth slider core module 221d.

[0064] use Figure 1 The method for casting an aluminum wheel hub with a casting mold of a Chalco wheel hub comprises the following steps:

[0065] a) Raw material processing: Use a spectrometer to test the chemical composition of aluminum raw materials (aluminum ingots or aluminum bars, etc.). Use a crucible electric furnace to melt the qualified raw materials, and remove impurities and slag from the melt after smelting. The specific impurity removal method is to use an argon graphite rotor to stir for 20 minutes to remove hydrogen and oxide scale, add 500g of slag removal agent to remove slag, and add 500g of refining agent for refining. Detect the chemical composition and temperature of the refined melt, mainly using a spectrometer to detect the chemical composition and hydrogen measurement, and use a temperature gun to detect the furnace temperature to ensure that the melt temperature is 740℃-750℃, and use the qualified melt as casting liquid for standby;

[0066] b) Mold pretreatment: At the same time as step a) above, the casting mold of the aluminum wheel hub is baked and preheated, and the temperature is detected by a thermocouple to control the temperature within the range of 410±20°. In order to prevent the pouring liquid from sticking to the inner cavity of the mold, the mold cavity needs to be sprayed. Use a spray gun to spray the inner cavity with paint, and the coating thickness is ≤0.5mm. In addition, the mold gate assembly also needs to be sprayed with paint. The coating thickness at the gate and runner of the gate assembly is 0.5-1mm. It is preferred to set a filter at the mold gate to further remove impurities from the poured molten liquid, and use a pressure gauge to detect the pressure in the mold cavity to ensure that the pressure in the cavity is ≥0.5Mpa;

[0067] c) Pouring: Use a pouring spoon to pour the casting liquid from step a) into the cavity of the aluminum wheel hub casting mold from the top gate assembly, ensure that the pouring volume is sufficient and clean up the excess material in time, ensure that each piece is poured and cleaned within 15-30 seconds, and use a time relay and alarm to ensure the pouring time. During pouring, use a temperature gun to detect the pouring temperature to ensure that the pouring temperature remains at 730℃-740℃. After pouring, place an asbestos pad on the gate and apply pressure with a pressure bag to ensure that the pressure in the cavity is ≥0.5Mpa and maintain the pressure for 400 seconds;

[0068] d) Cooling: While the bottom of the mold is cooling, the top of the mold is heated to maintain the top temperature at 200℃-350℃. The cooling time is 550 seconds from the start of pouring. The cooling time in the open-type casting box is 550 seconds from the start of pouring, and the top is continuously heated to 200℃-350℃. The bottom cooling starts from the completion of pouring and ends when the box is opened.

[0069] e) Take out the aluminum wheel hub blank and slider core module: After casting is completed, use a sawing machine or lathe to remove the pouring head, take out the aluminum wheel hub blank, and then take out the slider core module in order. It is necessary to select the slider core module with draft angles on both contact sides, then take out the slider core module with a draft angle on one side, and finally take out the remaining slider core modules.

[0070] Treatment after taking out the blank: put the hub blank into the heat treatment furnace for solution treatment and artificial aging heat treatment, including solution treatment: 525℃ / 12h, aging treatment: 155℃ / 4h, and then use a shot blasting machine to clean the appearance and remove internal stress.

[0071] Inspection: After the wheel blank is cast, it needs to be inspected, mainly mechanical properties inspection (qualified standards are tensile strength: ≥380Mpa, yield strength: ≥320Mpa; elongation: ≥7%; hardness: 120HBW), appearance inspection (no defects such as slag holes / pores / shrinkage / bumps) and casting size inspection.

[0072] In step c), after pouring is completed, the pressure is maintained for 400 seconds and the pressure in the cavity is ensured to be 0.5Mpa-1.5Mpa.

[0073] The traditional casting mold of aluminum wheel hub adopts low-pressure sand casting, and the mold is usually filled from the bottom of the mold at a pressure of 0.02-0.06MPa. The filling pressure is low, the wheel hub density is poor, the product density is about 2.7g.cm, the process yield rate is less than 80%, the product strength is poor, and it is easy to stick to sand.

[0074] The aluminum hub casting method of the present invention adopts gravity plus medium-pressure air energy casting, aluminum liquid is poured from the top of the mold, and after the pouring is completed, a pressure of ≥0.5Mpa, usually 0.5-1.5MPa, is applied to the cavity. The filling pressure is relatively high, which can play a certain shrinkage compensation role. The hub has good density, the product density is about 2.77-2.79g.cm, the process yield rate is greater than 85%, and the product has high strength and good performance.

[0075] Embodiment 2:

[0076] The difference between the second embodiment and the first embodiment is that:

[0077] The structure of the core mold assembly 2 is slightly different, such as Figures 6 to 8As shown in the figure, the top of the middle core mold 23 is provided with a plurality of plug-in slots 231 arranged at intervals, and the plurality of plug-in slots 231 are evenly distributed along the circumference of the top of the middle core mold 23. A radial plug-in connector protruding in the radial direction is provided inside each slider core module, and the radial plug-in connector is adapted to the plug-in slot. In this embodiment, the top of the middle core mold 23 is provided with five plug-in slots arranged at intervals, which are respectively: the first slider core module 241a, the second slider core module 241b, the third slider core module 241c, the fourth slider core module 241d and the fifth slider core module 241e in the clockwise direction, and the corresponding radial plug-in connectors are respectively the first radial plug-in connector 241a1, the second radial plug-in connector 241b1, the third radial plug-in connector 241c1, the fourth radial plug-in connector 241d1 and the fifth radial plug-in connector 241e1. The order of removing the above five slider core modules is: first remove the first slider core module 241a, then remove the second slider core module 241b and / or the fifth slider 241e, and then remove the third slider core module 241c and / or the fourth slider core module 241d.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A casting mold for an aluminum wheel hub, characterized in that: include: An upper mold assembly, the upper mold assembly comprising an upper mold, an upper mold core and an upper connecting plate, the upper mold being fixedly connected to the upper mold core and the upper connecting plate respectively, A core mold assembly, the core mold assembly includes an intermediate core mold and a core mold ring, the core mold ring is formed by a plurality of slider core modules distributed circumferentially around the intermediate core mold, and the core mold ring is used to form the oil cavity of the wheel hub blank, An auxiliary molding assembly, the auxiliary molding assembly comprising an ejection ring and an ejection plate, the ejection ring and the ejection plate being fixedly connected; A lower mold assembly, the lower mold assembly comprising a bottom plate, a lower mold plate, a lower mold, and a lower mold insert assembly, the bottom plate is fixedly connected to the lower mold plate, and the lower mold plate is fixedly connected to the lower mold plate, the lower mold insert assembly and the core mold assembly; A gate assembly, the gate assembly is located above the upper mold core, and the gate assembly is provided with a gate and a runner; The upper mold, the upper mold core, the core mold assembly, the ejection ring, the lower mold and the lower mold insert assembly together form a mold cavity of the aluminum wheel hub, and the gate and the runner are connected to the mold cavity of the aluminum wheel hub; Each of the slider core modules is provided with two contact side surfaces that abut against other slider core modules, and at least one of the slider core modules has two contact side surfaces provided with draft angles; A plurality of the slider core modules are plugged and fixed to the middle core mold; The middle core mold is provided with a middle through hole for the diverter cone assembly to pass through, and the middle core mold is provided with a plug-in groove for the slider core module to be plugged in.

2. The casting mold for the aluminum wheel hub according to claim 1, characterized in that: The plug-in groove is configured as an annular slot opened on the outer peripheral surface of the middle core mold, and a downwardly protruding arc plug-in joint is provided at the bottom of each slider core module, and the arc plug-in joint is adapted to the annular slot.

3. The casting mold for the aluminum wheel hub according to claim 1, characterized in that: There are multiple plug-in grooves arranged at intervals at the top of the middle core mold, and the multiple plug-in grooves are evenly distributed along the circumference of the top of the middle core mold. A radial plug-in connector protruding radially is arranged inside each slider core module, and the radial plug-in connector is adapted to the plug-in groove.

4. The casting mold for the aluminum wheel hub according to claim 1, characterized in that: The lower mold insert assembly includes a lower mold insert ring and a plurality of bolt hole locating pins, the lower mold insert ring is fixedly connected to the lower mold plate, the plurality of bolt hole locating pins are fixed on the lower mold insert ring, the lower mold insert ring is provided with a positioning and mounting groove for mounting the intermediate core mold, the bottom of the intermediate core mold is provided with a plug-in portion adapted to the positioning and mounting groove, and the intermediate core mold is fixedly connected to the lower mold insert ring.

5. The casting mold for the aluminum wheel hub according to claim 1, characterized in that: The auxiliary molding assembly includes a push rod, which moves up and down along the guide hole on the bottom plate, and the push rod is fixedly connected to the ejection plate; The gate assembly includes a gate inner sleeve and a gate outer sleeve, the gate outer sleeve is provided with the gate and an installation cavity for accommodating the gate inner sleeve, the gate inner sleeve is provided with the runner, and the bottom end of the gate outer sleeve is fixedly connected to the upper mold core.

6. A method for casting an aluminum wheel hub using the casting mold of the aluminum wheel hub according to claim 1, characterized in that: The steps include: a) Raw material processing: Use a spectrometer to test the chemical composition of the aluminum raw materials, melt the raw materials, remove impurities and slag from the molten liquid after smelting, test the chemical composition and temperature of the molten liquid, ensure that the temperature of the molten liquid is 740℃-750℃, and use the molten liquid that has passed the test as casting liquid for standby use; b) Mold pretreatment: at the same time as step a), the casting mold of the aluminum wheel hub is preheated to control the temperature within the range of 410±20°, the mold cavity is sprayed with paint with a thickness of ≤0.5mm, a filter is set at the mold gate and the pressure in the mold cavity is tested to ensure that the pressure in the cavity is ≥0.5Mpa; c) Pouring: The casting liquid in step a) is injected into the cavity of the casting mold of the aluminum wheel hub from the top gate assembly, ensuring that the pouring amount is sufficient and the excess material is cleaned in time. It is necessary to ensure that each piece is poured and cleaned within 15-30 seconds. During pouring, the pouring temperature is maintained at 730℃-740℃. After the pouring is completed, the pressure is maintained for 400 seconds and the pressure in the cavity is ensured to be ≥0.5Mpa; d) Cooling: While the bottom of the mold is cooling, the top of the mold is heated to maintain the top temperature at 200°C-350°C. The cooling time is 550 seconds from the start of pouring; e) Take out the aluminum wheel hub blank and slider core module: remove the pouring head, take out the aluminum wheel hub blank, and then take out the slider core module in order. It is necessary to select the slider core module with draft angles on both contact sides, then take out the slider core module with a draft angle on one side, and finally take out the remaining slider core modules.

7. The method for casting an aluminum wheel hub according to claim 6, characterized in that: In step c), after pouring is completed, the pressure is maintained for 400 seconds and the pressure in the cavity is ensured to be 0.5Mpa-1.5Mpa.

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