A wheel hub sand core and core box mold

Abstract

The utility model provides a kind of hub sand core and core box mould.The hub sand core includes first half core and second half core, first half core is provided with first riser portion, first cavity portion and first baffle, second half core is provided with second riser portion, second cavity portion and second baffle.Second half core can be butted on first half core, so that first riser portion and second riser portion are communicated and form riser cavity, first cavity portion and second cavity portion are communicated and form cavity, to reduce the overall weight of hub sand core.First baffle is butted on second baffle, so that first baffle and second baffle jointly divide riser cavity and cavity, avoid the feeding material in riser cavity to flow into cavity.The abutted surface of first half core and second half core is concave with weight-reducing cavity, the weight-reducing cavity on first half core is located on the side wall of first riser portion, and the weight-reducing cavity of second half core is located on the side wall of second riser portion, to reduce the weight of first half core and second half core, facilitate the handling and installation of hub sand core.

Description

Technical Field

[0001] This utility model relates to the field of wheel hub casting technology, and in particular to a wheel hub sand core and core box mold. Background Technology

[0002] Ductile iron wheel hubs are crucial safety components for automotive chassis. They are produced through casting to obtain a rough blank, which is then machined to create the finished wheel hub. Most automotive wheel hubs on the market are front or rear hubs. The cavity between the two bearing shoulders inside the wheel hub has a bulging oil-filled structure. During the casting process, wheel hub sand cores are used in the casting mold to form the bulging oil-filled structure and bearing shoulders on the casting.

[0003] However, the existing wheel hub sand cores with bulging bellies are relatively thick and heavy, which makes the labor intensity of the operators when placing and installing the wheel hub sand cores in the mold relatively high, affecting the efficiency of core placement and impacting the health of the operators. Utility Model Content

[0004] The purpose of this utility model is to provide a wheel hub sand core that can reduce the weight of the wheel hub sand core and facilitate the handling and installation of the sand core.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] According to one aspect of the present invention, a wheel hub sand core is provided, the wheel hub sand core comprising: a first half-core having a first riser, a first cavity, and a first partition plate, wherein the first riser and the first cavity are respectively located on both sides of the first partition plate in the axial direction of the first half-core; and a second half-core having a second riser, a second cavity, and a second partition plate, wherein the second riser and the second cavity are respectively located on both sides of the second partition plate in the axial direction of the second half-core, the second half-core being able to abut against the first half-core, such that the first riser and the second riser form a riser cavity, and the first cavity and the second cavity form a cavity, and the first partition plate abuts against the second partition plate, such that the first partition plate and the second partition plate together separate the riser cavity and the cavity; wherein, the abutting surface of the first half-core and / or the abutting surface of the second half-core are recessed with a weight-reducing cavity, and the weight-reducing cavity of the first half-core is located on the side wall of the first riser, and the weight-reducing cavity of the second half-core is located on the side wall of the second riser.

[0007] In one embodiment of this application, the first half-core is provided with two weight-reducing cavities, and the second half-core is provided with two weight-reducing cavities. When the second half-core abuts against the first half-core, the weight-reducing cavities on the first half-core are in communication with the weight-reducing cavities on the second half-core.

[0008] In one embodiment of this application, a through riser channel is provided on the sidewall of the second riser portion.

[0009] In one embodiment of this application, the wall thickness of the cavity sidewall is less than the wall thickness of the oral cavity sidewall.

[0010] In one embodiment of this application, the first riser portion is recessed on the side facing the second riser portion, the first cavity portion is recessed on the side facing the second cavity portion, the second riser portion is protruding on the side facing the first riser portion, and the second cavity portion is protruding on the side facing the first cavity portion; wherein, the recessed portion and the protruding portion are adapted to each other, and the recessed step and the protruding step are adapted to each other, so that when the second half-core abuts against the first half-core, the protruding portion is engaged in the recessed portion, and the protruding step is engaged in the protruding step.

[0011] In one embodiment of this application, the recessed portion includes a recessed section located on the first partition plate and on the side of the first partition plate facing the first riser portion; the boss portion includes a boss section located on the second partition plate and on the side of the second partition plate facing the second riser portion; the boss section is capable of abutting against the recessed section, and the fitting clearance between the boss section and the recessed section is less than or equal to 0.15 mm.

[0012] In one embodiment of this application, a first mounting portion is provided on the side of the first riser away from the first partition, and a second mounting portion is provided on the side of the second riser away from the second partition. When the second half-core abuts against the first half-core, the first mounting portion and the second mounting portion can form a mounting portion for mounting the riser sleeve.

[0013] In one embodiment of this application, the first half-core is provided with a positioning part for positioning. The positioning part is located on the side of the first cavity portion away from the first partition plate. There are two positioning parts, and the two positioning parts are symmetrically arranged.

[0014] This application also provides a core box mold, which is applicable to any of the aforementioned wheel hub sand cores. The core box mold includes a fixed mold and a movable mold that can be spliced ​​onto the fixed mold. The fixed mold is provided with a first concave mold portion and a second concave mold portion, and the movable mold is provided with a first punch portion and a second punch portion. The first punch portion is provided corresponding to the first concave mold portion, and the second punch portion is provided corresponding to the second concave mold portion. After pressing, the first half-core can be formed between the first punch portion and the first concave mold portion, and the second half-core can be formed between the second punch portion and the second concave mold portion.

[0015] In one embodiment of this application, the core box mold further includes a top plate and ejector pins. The top plate is connected to the fixed mold and can move relative to the fixed mold. At least two ejector pins are provided. One end of each ejector pin is fixed to the top plate, and the ends of the two ejector pins away from the top plate can extend into the first cavity and the second cavity respectively to eject the first half-core and the second half-core.

[0016] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0017] In this invention, the wheel hub sand core includes a first half-core and a second half-core. The first half-core is provided with a first riser, a first cavity, and a first partition. The second half-core is provided with a second riser, a second cavity, and a second partition. The first riser and the first cavity are located on opposite sides of the axial direction of the first partition, and the second riser and the second cavity are located on opposite sides of the axial direction of the second partition. The second half-core abuts against the first half-core, forming a riser cavity with the first and second risers to accommodate additional feeding material. The first and second cavities form a mold cavity to reduce the overall weight of the wheel hub sand core. Simultaneously, the first partition abuts against the second partition, so that the first and second partitions together divide the riser cavity and the mold cavity to prevent the feeding material in the riser cavity from flowing into the mold cavity.

[0018] In addition, the contact surfaces of the first half-core and the second half-core are recessed with weight-reducing cavities, and the weight-reducing cavity on the first half-core is located on the side wall of the first riser, and the weight-reducing cavity on the second half-core is located on the side wall of the second riser. This can reduce the weight of the first half-core and the second half-core and facilitate the handling and installation of the wheel hub sand core. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a wheel hub sand core and a car wheel hub according to an embodiment of this utility model.

[0020] Figure 2 yes Figure 1 A cross-sectional view of a wheel hub core and a car wheel hub.

[0021] Figure 3 This is a schematic diagram of the hub sand core according to an embodiment of the present invention.

[0022] Figure 4 yes Figure 3 A cross-sectional view of the wheel hub sand core.

[0023] Figure 5 yes Figure 3 A schematic diagram of the first half of the hub sand core.

[0024] Figure 6yes Figure 3 A schematic diagram of the second half of the hub sand core.

[0025] Figure 7 This is a schematic diagram of the core box mold according to an embodiment of the present utility model.

[0026] Figure 8 yes Figure 7 A schematic diagram of the fixed mold of the core box mold.

[0027] Figure 9 yes Figure 7 A schematic diagram of the moving mold of the core box mold.

[0028] The annotations in the attached figures are explained as follows:

[0029] 1-Car wheel hub; 2-Wheel hub sand core; 3-Riser sleeve; 4-Core box mold; 10-First half-core; 11-First riser section; 12-First cavity section; 13-First partition plate; 20-Second half-core; 21-Second riser section; 22-Second cavity section; 23-Second partition plate; 24-Riser mouth; 25-Cavity; 26-Weight reduction cavity; 27-Riser channel; 28-Bulging cavity; 29-Bearing cavity; 31-Recessed section; 3 2-Recessed step; 33-Boss part; 34-Protruding step; 35-First mounting part; 36-Second mounting part; 37-Positioning part; 38-Mounting part; 41-Fixed mold; 42-Moving mold; 43-Top plate; 44-Ejector rod; 45-Mold opening pillar; 46-Spring; 311-Recessed section; 331-Boss section; 411-First die part; 412-Second die part; 421-First punch part; 422-Second punch part. Detailed Implementation

[0030] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0031] In the description of this utility model, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications will also change accordingly.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Existing wheel hub cores with bulging rims are relatively thick and heavy, making the placement and installation of these cores in the mold labor-intensive for operators, affecting core-setting efficiency and impacting operator health. Furthermore, existing wheel hub core raw materials contain resin, hardeners, and other additives, which produce fumes and irritating odors when exposed to high temperatures during the core-making and casting process. Therefore, a new type of wheel hub core is proposed to solve these problems.

[0034] The solution is further illustrated by the following examples:

[0035] Figure 1 This is a schematic diagram of a wheel hub sand core and a car wheel hub according to an embodiment of this utility model. Figure 2 yes Figure 1 A cross-sectional view of a wheel hub core and a car wheel hub. Figure 3 This is a schematic diagram of the hub sand core according to an embodiment of the present invention.

[0036] Figure 4 yes Figure 3 A cross-sectional view of the wheel hub sand core. Figure 5 yes Figure 3 A schematic diagram of the first half of the hub sand core.

[0037] Figure 6 yes Figure 3 A schematic diagram of the second half of the hub sand core.

[0038] Please see Figure 1 , Figure 2 and Figure 3 In this embodiment, the wheel hub sand core 2 is used as the inner core of the mold when the automobile wheel hub 1 is cast, so that the interior of the cast automobile wheel hub 1 has a bulging oil sac and bearing shoulder and other structures.

[0039] Specifically, the wheel hub sand core 2 may include a first half core 10 and a second half core 20, and the second half core 20 can abut against the first half core 10, so that the first half core 10 and the second half core 20 can be spliced ​​into a whole wheel hub sand core 2.

[0040] In this embodiment, the wheel hub sand core 2 has a cylindrical structure, and the shape of the outer wall of the wheel hub sand core 2 is similar to the structure of the inner cavity of the car wheel hub 1, so that the casting forms the inner cavity of the car wheel hub 1 at the wheel hub sand core 2 after casting.

[0041] Furthermore, the contact surface of the first half-core 10 and the second half-core 20 is a cross section passing through the central axis of the hub sand core 2, so that the first half-core 10 and the second half-core 20 are symmetrical structures.

[0042] See Figure 4 , Figure 5 and Figure 6 The first half-core 10 is provided with a first riser 11, a first cavity 12, and a first partition 13. In the axial direction of the first half-core 10, the first riser 11 and the first cavity 12 are respectively located on both sides of the first partition 13. The second half-core 20 is provided with a second riser 21, a second cavity 22, and a second partition 23. In the axial direction of the second half-core 20, the second riser 21 and the second cavity 22 are respectively located on both sides of the second partition 23.

[0043] In this embodiment, when the second half-core 20 can abut against the first half-core 10, the first riser portion 11 and the second riser portion 21 can be aligned to form the riser cavity 24, and the first cavity portion 12 and the second cavity portion 22 can be aligned to form the cavity 25.

[0044] The cavity 24 is used to hold the feeding material, so that the feeding material can be used to compensate for the solidification shrinkage of the casting and prevent defects such as shrinkage cavities from forming in the casting. In addition, one side of the cavity 25 is open to facilitate the discharge of gas during the pouring process, thereby reducing the risk of porosity defects during the casting of the automobile wheel hub 1.

[0045] At the same time, the first partition 13 abuts against the second partition 23, and the first partition 13 and the second partition 23 together separate the vent cavity 24 and the cavity 25, so that the vent cavity 24 and the cavity 25 each form an independent chamber, and prevent the filling material in the vent cavity 24 from flowing into the cavity 25.

[0046] See Figure 5 and Figure 6 The abutting surface of the first half-core 10 and / or the abutting surface of the second half-core 20 are recessed with a weight-reducing cavity 26. That is, the abutting surface of the first half-core 10 is provided with a weight-reducing cavity 26, or the abutting surface of the second half-core 20 is provided with a weight-reducing cavity 26, or both the abutting surfaces of the first half-core 10 and the second half-core 20 are provided with a weight-reducing cavity 26.

[0047] Specifically, the weight reduction cavity 26 of the first half-core 10 is located on the side wall of the first riser 11, and the weight reduction cavity 26 of the second half-core 20 is located on the side wall of the second riser 21. The weight reduction cavities 26 of the first half-core 10 and the second half-core 20 are both used to reduce the mass of the first half-core 10 and the second half-core 20, thereby reducing the overall weight of the hub sand core 2.

[0048] It should be noted that in the hub sand core 2, the sidewall thickness of the first riser 11 and the second riser 21 is greater than the sidewall thickness of the first cavity 12 and the second cavity 22, in order to avoid the temperature of the casting material on the outer peripheral wall of the hub sand core 2 affecting the temperature of the feeding material located in the riser cavity 24 during casting. Therefore, a weight reduction cavity 26 is opened on the sidewall of the first riser 11 and the second riser 21, which can reduce the mass of the first half-core 10 and the second half-core 20, and also ensure that the temperature of the feeding material in the riser cavity 24 is not affected by the outside, thereby improving the feeding effect.

[0049] In this embodiment, the first half-core 10 may be provided with two weight-reducing cavities 26, and the two weight-reducing cavities 26 of the first half-core 10 may be arranged symmetrically. The second half-core 20 may be provided with two weight-reducing cavities 26, and the two weight-reducing cavities 26 of the second half-core 20 may be arranged symmetrically.

[0050] When the second half-core 20 abuts against the first half-core 10, the weight-reducing cavity 26 on the first half-core 10 is connected to the weight-reducing cavity 26 on the second half-core 20, thereby further reducing the weight of the first half-core 10 and the second half-core 20, so as to facilitate the handling and core setting by the operator, reduce the workload of the operator, and improve work efficiency.

[0051] See Figure 4 and Figure 6 A through riser channel 27 can be provided on the side wall of the second riser 21, so that the riser channel 27 can connect the riser cavity and the outside of the hub sand core 2, so that the feeding material in the riser cavity 24 can flow along the riser channel 27 to the periphery of the hub sand core 2, thereby enabling the feeding material in the riser cavity 24 to feed the casting during the casting process.

[0052] It should be noted that during the casting process, the riser channel 27 can also allow the molten iron used for casting the automobile wheel hub 1 to flow along the riser channel 27 into the riser cavity 24, so that this part of the molten iron can be used for feeding, thereby avoiding defects such as lock holes in the automobile wheel hub 1 casting.

[0053] In some other embodiments, the riser channel 27 may be provided on the first riser portion 11 so that the first riser portion 11 or the riser cavity 24 can communicate with the outer peripheral side of the hub sand core 2.

[0054] See Figure 4The thickness of the sidewall of cavity 25 is less than the thickness of the sidewall of the vent 24, so as to reduce the overall weight of hub sand core 2.

[0055] Furthermore, both the first cavity portion 12 and the second cavity portion 22 can be provided with a connected bulging cavity 28 and a bearing cavity 29, and the wall thickness of the bulging cavity 28 and the bearing cavity 29 is the same. That is, the contour of the cavity 25 is set according to the shape of the wheel hub sand core 2 in this part, so that the wall thickness of the cavity 25 is kept consistent, thereby minimizing the weight of the wheel hub sand core 2.

[0056] See Figure 4 , Figure 5 and Figure 6 The first riser 11 has a recessed portion 31 on the side facing the second riser 21, and the first cavity portion 12 has a recessed step 32 on the side facing the second cavity portion 22. The second riser 21 has a protruding boss 33 on the side facing the first riser 11, and the second cavity portion 22 has a protruding step 34 on the side facing the first cavity portion 12.

[0057] The recessed portion 31 is adapted to the boss portion 33, and the recessed step 32 is adapted to the raised step 34. When the second half-core 20 abuts against the first half-core 10, the boss portion 33 is engaged in the recessed portion 31, and the raised step 34 is engaged in the raised step 34. This prevents the molten iron from flowing into the riser 24 or the mold cavity 25 along the joint between the first half-core 10 and the second half-core 20 during the casting of the automobile wheel hub 1. It also prevents and eliminates the overflow of the feeding material of the riser 24 into the weight reduction cavity 26, and also avoids the formation of flash and burrs on the casting.

[0058] In this embodiment, the recessed portion 31 may include a recessed section 311, which is located on the first partition 13 and on the side of the first partition 13 facing the first riser portion 11. Similarly, the boss portion 33 may include a boss section 331, which is located on the second partition 23 and on the side of the second partition 23 facing the second riser portion 21. When the first half-core 10 abuts against the second half-core 20, the boss section 331 abuts against the recessed section 311, and the fitting gap between the boss section 331 and the recessed section 311 is less than or equal to 0.15 mm to prevent the packing material in the riser cavity 24 from flowing along the joint between the first partition 13 and the second partition 23 into the cavity 25.

[0059] It should be noted that, except for the recessed section 311, the fit clearance between the recessed portion 31 and the boss portion 33 is 0.6 mm, and the fit clearance between the recessed step 32 and the raised step 34 is also 0.6 mm.

[0060] See Figure 2 , Figure 4 , Figure 5 and Figure 6 A first mounting portion 35 may be provided on the side of the first riser 11 away from the first partition 13, and a second mounting portion 36 may be provided on the side of the second riser 21 away from the second partition 23. When the second half core 20 abuts against the first half core 10, the first mounting portion 35 and the second mounting portion 36 can form a mounting portion 38 for mounting the riser sleeve 3.

[0061] In this embodiment, the riser sleeve 3 is configured as a heating riser sleeve to ensure the temperature of the feeding material inside the riser cavity 24 and improve the feeding effect.

[0062] See Figure 3 and Figure 5 The first half-core 10 is provided with a positioning part 37 for positioning. The positioning part 37 is located on the side of the first cavity part 12 away from the first partition plate 13. There are two positioning parts 37, and the two positioning parts 37 are symmetrically arranged.

[0063] It should be noted that the positioning part 37 is used to facilitate the installation of the wheel hub sand core 2 onto the mold, so as to form positioning and support, and to prevent the wheel hub sand core 2 from rotating.

[0064] Figure 7 This is a schematic diagram of the core box mold according to an embodiment of the present utility model. Figure 8 yes Figure 7 A schematic diagram of the fixed mold of the core box mold. Figure 9 yes Figure 7 A schematic diagram of the moving mold of the core box mold.

[0065] See Figure 7 , Figure 8 and Figure 9 The core box mold 4 in this embodiment is applicable to the aforementioned wheel hub sand core 2, that is, the core box mold 4 is used to press the wheel hub sand core 2 to improve the manufacturing efficiency of the wheel hub sand core 2.

[0066] Specifically, the core box mold 4 may include a fixed mold 41 and a moving mold 42, and the moving mold 42 can be spliced ​​onto the fixed mold 41. Specifically, the fixed mold 41 and the moving mold 42 are installed on the core making machine, so that the core making machine can drive the moving mold 42 to move relative to the fixed mold 41, so that the moving mold 42 can press out the hub sand core 2.

[0067] In this embodiment, the fixed mold 41 is provided with a first die portion 411 and a second die portion 412, and the moving mold 42 is provided with a first punch portion 421 and a second punch portion 422. The first punch portion 421 is provided corresponding to the first die portion 411, and the second punch portion 422 is provided corresponding to the second die portion 412. After pressing, a first half-core 10 can be formed between the first punch portion 421 and the first die portion 411, and a second half-core 20 can be formed between the second punch portion 422 and the second die portion 412.

[0068] Meanwhile, the core box mold 4 may also include a top plate 43 and ejector pins 44. The top plate 43 is connected to the fixed mold 41 and can move relative to the fixed mold 41. At least two ejector pins 44 are provided. One end of each ejector pin 44 is fixed to the top plate 43. The ends of the two ejector pins 44 away from the top plate 43 can extend into the first cavity 411 and the second cavity 412 respectively to eject the first half core 10 and the second half core 20, facilitating the demolding of the first half core 10 and the second half core 20.

[0069] Furthermore, the core box mold 4 may also include a mold opening pin 45 and a spring 46. The mold opening pin 45 is connected to the moving mold 42 and can move relative to the moving mold 42. One end of the mold opening pin 45 can extend out of the moving mold 42 and move towards the fixed mold 41, allowing the mold opening pin 45 to abut against the moving mold 42, thus separating the fixed mold 41 and the moving mold 42 for mold opening. The spring 46 is connected between the moving mold 42 and the mold opening pin 45 to drive the mold opening pin 45 to reset.

[0070] In this embodiment, the manufacturing process of the wheel hub sand core 2 is as follows: The core box mold 4 is installed on the core-making machine, so that the core box mold 4 can press out the wheel hub sand core 2 under the drive of the core-making machine. At the same time, heating tubes and thermocouples are used to heat the core box mold 4 and the wheel hub sand core 2 to control the temperature of the core box mold 4 and the wheel hub sand core 2, so that the core-making temperature is maintained between 210°C and 280°C.

[0071] After pressing, coated sand is sprayed onto the wheel hub core 2, allowing it to solidify at high temperatures. Simultaneously, the core box mold 4 is equipped with ejector pins 44 and springs, allowing the wheel hub core 2 to be ejected via the ejector pins 44 after the mold 4 opens. It should be noted that because the wheel hub core 2 has a uniform wall thickness and a thin overall structure, the heating rate of the core 2 is accelerated after sand spraying, shortening the curing time, reducing energy consumption, and increasing core-making efficiency per unit time. Furthermore, due to the uniform wall thickness and thin overall structure of the wheel hub core 2, the core itself experiences a shorter heating time, reducing the time the core 2 spends at high temperatures, thus reducing the time spent in the core-making and wheel hub casting processes. This reduces gases, fumes, and irritating odors generated by the chemical reaction of the coated sand at high temperatures, and also reduces the product's porosity tendency.

[0072] After the wheel hub sand core 2 is taken from the core box mold 4, adhesive is applied to the mating surface (i.e. convex and concave mating surface) of the first half core 10 or the second half core 20 so that the first half core 10 and the second half core 20 are engaged and bonded into a whole wheel hub sand core 2. The wheel hub sand core 2 is then placed in the box of the automobile wheel hub 1 production mold.

[0073] Meanwhile, after the casting of the automobile wheel hub 1 is completed, the outer side of the wheel hub sand core 2 can form structures such as the bulge oil sac and bearing shoulder of the automobile wheel hub 1. After removing the riser and sanding the automobile wheel hub 1 casting, the blank of the automobile wheel hub 1 can be obtained.

[0074] In summary, the wheel hub sand core 2 includes a first half-core 10 and a second half-core 20. The first half-core 10 is provided with a first riser 11, a first cavity 12, and a first partition 13. The second half-core 20 is provided with a second riser 21, a second cavity 22, and a second partition 23. The first riser 11 and the first cavity 12 are located on opposite sides of the first partition 13 along its axial direction, and the second riser 21 and the second cavity 22 are located on opposite sides of the second partition 23 along its axial direction. The second half-core 20 can abut against the first half-core 10, so that the first riser 11 and the second riser 21 communicate and form a riser cavity 24 for accommodating supplementary shrinkage material. Furthermore, the first cavity 12 and the second cavity 22 communicate and form a cavity 25 to reduce the overall weight of the wheel hub sand core 2. Meanwhile, the first partition 13 abuts against the second partition 23, so that the first partition 13 and the second partition 23 together divide the mouth cavity 24 and the cavity 25, so as to prevent the filling material in the mouth cavity 24 from flowing into the cavity 25.

[0075] In addition, the contact surfaces of the first half-core 10 and the second half-core 20 are recessed with a weight-reducing cavity 26, and the weight-reducing cavity 26 on the first half-core 10 is located on the side wall of the first riser 11, and the weight-reducing cavity 26 on the second half-core 20 is located on the side wall of the second riser 21. This can reduce the weight of the first half-core 10 and the second half-core 20, and facilitate the handling and installation of the hub sand core 2.

[0076] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A wheel hub core, characterized in that, The hub sand core includes: The first half-core is provided with a first riser, a first cavity and a first partition. In the axial direction of the first half-core, the first riser and the first cavity are respectively located on both sides of the first partition. The second half-core is provided with a second riser, a second cavity, and a second partition. In the axial direction of the second half-core, the second riser and the second cavity are respectively located on both sides of the second partition. The second half-core can abut against the first half-core, so that the first riser and the second riser form a riser cavity, and the first cavity and the second cavity form a cavity. The first partition abuts against the second partition, and the first partition and the second partition together separate the riser cavity from the cavity. The first half-core and / or the second half-core have a recessed weight-reducing cavity on their contact surfaces, and the weight-reducing cavity of the first half-core is located on the side wall of the first riser, and the weight-reducing cavity of the second half-core is located on the side wall of the second riser.

2. The wheel hub core of claim 1, wherein, The first half-core is provided with two weight-reducing cavities, and the second half-core is provided with two weight-reducing cavities. When the second half-core abuts against the first half-core, the weight-reducing cavities on the first half-core are connected to the weight-reducing cavities on the second half-core.

3. The wheel hub core of claim 1, wherein, A through riser channel is provided on the side wall of the second riser.

4. The wheel hub core of claim 1, wherein, The wall thickness of the cavity sidewall is less than the wall thickness of the oral cavity sidewall.

5. The wheel hub core of claim 1, wherein, The first riser portion has a recessed portion on the side facing the second riser portion, the first cavity portion has a recessed step on the side facing the second cavity portion, the second riser portion has a protruding boss on the side facing the first riser portion, and the second cavity portion has a protruding step on the side facing the first cavity portion. The recessed portion is adapted to the protruding portion, and the recessed step is adapted to the protruding step, so that when the second half-core abuts against the first half-core, the protruding portion engages in the recessed portion, and the protruding step engages in the protruding step.

6. The wheel hub core of claim 5, wherein, The recessed portion includes a recessed section located on the first partition plate and on the side of the first partition plate facing the first riser. The boss portion includes a boss section located on the second partition plate and on the side of the second partition plate facing the second riser. The boss section can abut against the recessed section, and the fitting gap between the boss section and the recessed section is less than or equal to 0.15 mm.

7. The wheel hub core of claim 1, wherein, A first mounting portion is provided on the side of the first riser away from the first partition, and a second mounting portion is provided on the side of the second riser away from the second partition. When the second half-core abuts against the first half-core, the first mounting portion and the second mounting portion can form a mounting portion for mounting the riser sleeve.

8. The wheel hub core of claim 1, wherein, The first half-core is provided with a positioning part for positioning. The positioning part is located on the side of the first cavity that is away from the first partition. There are two positioning parts, and the two positioning parts are symmetrically arranged.

9. A core box mold characterized by, The core box mold is applicable to the wheel hub sand core according to any one of claims 1-8. The core box mold includes a fixed mold and a movable mold that can be spliced ​​onto the fixed mold. The fixed mold is provided with a first concave mold portion and a second concave mold portion. The movable mold is provided with a first punch portion and a second punch portion. The first punch portion is provided corresponding to the first concave mold portion, and the second punch portion is provided corresponding to the second concave mold portion. After pressing, the first half core can be formed between the first punch portion and the first concave mold portion, and the second half core can be formed between the second punch portion and the second concave mold portion.

10. The core box mold of claim 9, wherein, It also includes a top plate and ejector pins. The top plate is connected to the fixed mold and can move relative to the fixed mold. There are at least two ejector pins. One end of each ejector pin is fixed to the top plate. The ends of the two ejector pins away from the top plate can extend into the first cavity and the second cavity, respectively, to eject the first half-core and the second half-core.

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