A wheel hub casting mold and a wheel hub core box

Abstract

The utility model provides a kind of wheel hub casting mould and wheel hub core box, wheel hub casting mould includes lower sand mould, upper sand mould, lower mould, upper mould, first inner core and second inner core.Lower sand mould and upper sand mould can be respectively cast in lower mould and upper mould, and respectively get lower cavity and upper cavity in lower mould and upper mould.When closing, lower cavity and upper cavity are communicated and form cavity, first inner core and second inner core are all contained in cavity, when casting, cavity, first inner core and second inner core form wheel hub jointly.Second inner core is provided with recessed part on outer circumferential side, when casting, recessed part can form the bearing shoulder of wheel hub.Second inner core is provided with feeding space, and feeding hole is arranged on the inner wall of second inner core, and when casting, the casting material in feeding space can feed the bearing shoulder, that is, the place where the wall thickness of wheel hub is relatively large is fed, to improve shrinkage and shrinkage hole and other defects generated in casting process, to improve the yield of wheel hub casting.

Description

Technical Field

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

[0002] Ductile iron wheel hubs are safety components of automotive chassis. They are produced by casting a rough blank, which is then machined to obtain the finished wheel hub. The wheel hub is a key component of the vehicle's chassis system, housing bearings internally and connecting to brake drums or discs externally. The center of the wheel hub connects to the axle. Therefore, the quality of the wheel hub directly affects vehicle safety, placing high demands on the quality of the castings. The performance of the castings directly impacts the vehicle's safety and load-bearing capacity.

[0003] Currently, most wheel hubs are manufactured using casting. After casting the wheel hub blank, the blank is then processed to finally obtain a qualified wheel hub.

[0004] However, during the casting process of existing wheel hubs, due to the structural design of the wheel hub itself and the influence of the casting materials, the cast wheel hub parts with thick walls are prone to defects such as shrinkage porosity and shrinkage cavities, which affects the yield of wheel hub casting. Utility Model Content

[0005] The purpose of this invention is to provide a wheel hub casting mold that can improve defects such as shrinkage porosity and shrinkage cavities generated during the casting process, thereby increasing the yield of wheel hub casting.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] According to one aspect of this utility model, a wheel hub casting mold is provided, comprising: a lower sand mold capable of casting; an upper sand mold capable of casting; a lower mold capable of casting within the lower sand mold to form a lower cavity within the lower sand mold; an upper mold capable of casting within the upper sand mold to form an upper cavity within the upper sand mold, wherein when the upper sand mold covers the lower sand mold, the upper cavity communicates with the lower cavity and forms a cavity; and a first inner core disposed within the cavity, the bottom of the first inner core abutting against the bottom of the lower cavity. The top of the first inner core extends into the upper cavity; the second inner core is housed within the cavity and abuts against the top of the first inner core, so that during casting, the cavity, the first inner core, and the second inner core form a hub; wherein, a recess is provided on the outer peripheral side of the second inner core, the recess being arranged along the circumference of the second inner core, so that during casting, a bearing shoulder of the hub is formed in the recess; a shrinkage compensation space is provided inside the second inner core, and a through shrinkage compensation hole is opened on the side wall of the second inner core, one end of the shrinkage compensation hole connecting to the shrinkage compensation space and the other end connecting to the recess.

[0008] In one embodiment of this application, the upper mold is provided with a flange boss. When the upper mold is cast in the upper sand mold, the flange boss can form a flange groove in the upper cavity so that the flange of the hub can be formed in the flange groove during casting. The lower mold is provided with a main body, a reinforcing step, and a plurality of reinforcing grooves. The reinforcing step is provided on the outer periphery of the main body, and the reinforcing grooves are provided on the reinforcing step and recessed along the axial direction of the main body. The plurality of reinforcing grooves are spaced apart circumferentially along the main body. When the lower mold is cast in the lower sand mold, the main body and the reinforcing step can form the lower cavity. The plurality of reinforcing grooves can form a reinforcing part in the lower cavity so that the reinforcing part can form a reinforcing rib of the hub during casting. The reinforcing rib is connected to the flange, and two adjacent reinforcing ribs can form a reinforcing rib.

[0009] In one embodiment of this application, the first inner core is provided with an inner core body and a plurality of weight-reducing parts. The weight-reducing parts are disposed on the outer peripheral side of the inner core body, and the plurality of weight-reducing parts are spaced apart circumferentially along the inner core body. The length direction of the weight-reducing parts extends along the axial direction of the inner core body. During casting, the weight-reducing parts can form the weight-reducing cavity of the hub. The weight-reducing cavity is connected to the reinforcing rib and is located on the side of the reinforcing rib away from the flange. A connecting rib is formed between two weight-reducing cavities, and the connecting rib is correspondingly disposed to the reinforcing rib.

[0010] In one embodiment of this application, the bottom of the inner core body is provided with an installation part, and the end of the body part is provided with an installation protrusion. When the lower mold is casting in the lower sand mold, the installation protrusion can form an installation groove in the lower cavity. The installation groove is used to connect the installation part. The installation groove is adapted to the installation part, so that the installation groove can support and limit the installation part.

[0011] In one embodiment of this application, a positioning groove is provided at the top of the inner core body, and a positioning protrusion is provided at the bottom of the second inner core. When the second inner core can abut against the top of the first inner core, the positioning protrusion can be inserted into the positioning groove and limit the first inner core and the second inner core.

[0012] In one embodiment of this application, a riser sleeve is further included, which is housed within the upper cavity and connected to the top of the second inner core, and the chamber of the riser sleeve communicates with the compensation space.

[0013] This application also provides a hub core box for manufacturing either the first inner core or the second inner core. The hub core box includes a first core mold and a second core mold that can be fitted onto the first core mold. The first core mold has a first lower cavity and a second lower cavity, and the second core mold has a first upper cavity and a second upper cavity. When the second core mold is fitted onto the first core mold, the first lower cavity and the first upper cavity communicate to form a first chamber, and the second lower cavity and the second upper cavity communicate to form a second chamber. During core manufacturing, the first chamber is used to manufacture the first inner core, and the second chamber is used to manufacture the second inner core.

[0014] In one embodiment of this application, the first lower cavity is provided with a main body chamber and a plurality of weight-reducing chambers. During core making, the main body chamber and the weight-reducing chambers are respectively used to form the inner core body and the weight-reducing part of the first inner core.

[0015] In one embodiment of this application, an mounting chamber and a weight-reducing protrusion are formed in the first upper cavity. The mounting chamber is open to the side facing the first lower cavity. The weight-reducing protrusion is located in the mounting chamber and connected to the side of the mounting chamber away from the first lower cavity. During core making, the mounting chamber and the weight-reducing protrusion together form the mounting portion of the first inner core.

[0016] In one embodiment of this application, a shrinkage-compensating protrusion and a connecting portion are provided in the second lower cavity. The shrinkage-compensating protrusion protrudes from the bottom of the second lower cavity, and the connecting portion connects the outer periphery of the shrinkage-compensating protrusion and the inner wall of the second lower cavity, and is connected to the bottom of the second lower cavity. A shrinkage-compensating portion is provided in the second upper cavity. During core making, the shrinkage-compensating protrusion and the shrinkage-compensating portion are used to form the shrinkage-compensating space, and the connecting portion is used to form the shrinkage-compensating hole.

[0017] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0018] In this invention, the wheel hub casting mold includes a lower sand mold, an upper sand mold, a lower mold, an upper mold, a first inner core, and a second inner core. The lower and upper sand molds are respectively cast within the lower and upper molds, forming a lower cavity and an upper cavity respectively. During mold assembly, the lower and upper cavities connect to form a mold cavity. Simultaneously, the first and second inner cores are housed within the mold cavity. The bottom of the first inner core abuts against the bottom of the lower cavity, and the top of the first inner core extends into the upper cavity. The second inner core abuts against the top of the first inner core. Thus, during casting, the mold cavity, the first inner core, and the second inner core together form the wheel hub. Furthermore, a recess is provided on the outer periphery of the second inner core, and the recess is arranged circumferentially along the second inner core, so that during casting, the recess can form a bearing shoulder for the wheel hub. The second inner core contains a feeding space, and its inner wall has feeding holes. One end of the feeding hole connects to the feeding space, and the other end connects to the recessed area. During casting, the casting material in the feeding space can feed the bearing shoulder on the wheel hub casting. Because the bearing shoulder has a relatively large wall thickness, shrinkage cavities and porosity are prone to occur during casting cooling. Therefore, the casting material in the feeding space can feed the bearing shoulder, improving defects such as shrinkage cavities and porosity, and thus improving the yield of wheel hub casting. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a wheel hub casting mold according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a wheel hub casting blank according to an embodiment of the present utility model.

[0021] Figure 3 yes Figure 2 Another schematic diagram of the wheel hub casting blank.

[0022] Figure 4 yes Figure 2 A cross-sectional view of the wheel hub casting blank.

[0023] Figure 5 yes Figure 1A cross-sectional view of the wheel hub casting mold.

[0024] Figure 6 yes Figure 1 A schematic diagram of the lower sand tire of the wheel hub casting mold.

[0025] Figure 7 yes Figure 1 A schematic diagram of the lower mold for wheel hub casting.

[0026] Figure 8 yes Figure 1 A schematic diagram of the upper sand tire of the wheel hub casting mold.

[0027] Figure 9 yes Figure 1 A schematic diagram of the upper mold of the wheel hub casting mold.

[0028] Figure 10 yes Figure 1 A schematic diagram of the first and second inner cores of the wheel hub casting mold.

[0029] Figure 11 yes Figure 1 Another schematic diagram of the first and second inner cores of the wheel hub casting mold.

[0030] Figure 12 yes Figure 1 Exploded view of the first and second inner cores of the wheel hub casting mold.

[0031] Figure 13 This is a schematic diagram of the first core mold of the hub core box according to an embodiment of the present utility model.

[0032] Figure 14 yes Figure 13 A schematic diagram of the second core mold of the hub core box.

[0033] The annotations in the attached figures are explained as follows:

[0034] 10-Hub; 11-Bearing shoulder; 12-Flange; 13-Reinforcing rib; 14-Reinforcing rib; 15-Weight reduction cavity; 16-Connecting rib; 17-Shrinkage compensation structure; 20-Lower sand mold; 21-Lower cavity; 22-Reinforcing part; 23-Mounting groove; 24-Horizontal sprue; 30-Upper sand mold; 31-Upper cavity; 32-Flange groove; 33-Sprue; 34-Filter cavity; 35-Inner sprue; 36-Exhaust channel; 40-Lower mold; 41-Main body; 42-Reinforcing step; 43-Reinforcing groove; 44-Horizontal sprue; 50-Upper mold; 51-Flange boss; 52-Sprue; 53-Filter; 54-Inner sprue; 55-Air outlet; 60-First inner core ; 61-Inner core body; 62-Weight reduction part; 63-Mounting part; 64-Positioning groove part; 65-Weight reduction cavity; 66-Recessed part; 67-Shrinkage groove; 68-Shrinkage opening; 70-Second inner core; 71-Recessed part; 72-Shrinkage space; 73-Shrinkage hole; 74-Positioning protrusion; 75-Riser sleeve; 80-First core mold; 81-First lower cavity; 82-Second lower cavity; 83-Main body cavity; 84-Weight reduction cavity; 85-Shrinkage protrusion; 86-Connecting part; 87-Shrinkage protrusion; 88-Shrinkage section; 90-Second core mold; 91-First upper cavity; 92-Second upper cavity; 93-Mounting cavity; 94-Weight reduction protrusion; 211-Cavity; 411-Mounting protrusion. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Currently, most wheel hubs are manufactured using casting. After casting the wheel hub blank, the blank is then machined to obtain a qualified wheel hub. However, due to the wheel hub's structural design and the influence of casting materials, existing wheel hub castings are prone to defects such as shrinkage porosity and shrinkage cavities in areas with large wall thicknesses, thus affecting the yield rate of wheel hub casting. Therefore, a wheel hub casting mold is proposed to solve the above problems.

[0039] The solution is further illustrated by the following examples:

[0040] Figure 1 This is a schematic diagram of a wheel hub casting mold according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a wheel hub casting blank according to an embodiment of the present utility model. Figure 3 yes Figure 2 Another schematic diagram of the wheel hub casting blank. Figure 4 yes Figure 2 A cross-sectional view of the wheel hub casting blank. Figure 5 yes Figure 1 A cross-sectional view of the wheel hub casting mold. Figure 6 yes Figure 1 A schematic diagram of the lower sand tire of the wheel hub casting mold. Figure 7 yes Figure 1 A schematic diagram of the lower mold for wheel hub casting. Figure 8 yes Figure 1 A schematic diagram of the upper sand tire of the wheel hub casting mold. Figure 9 yes Figure 1 A schematic diagram of the upper mold of the wheel hub casting mold. Figure 10 yes Figure 1 A schematic diagram of the first and second inner cores of the wheel hub casting mold.

[0041] Please see Figure 1 , Figure 2 and Figure 3 The wheel hub casting mold of this embodiment is used to cast the wheel hub 10. In this embodiment, the wheel hub 10 includes a bearing shoulder 11, a flange portion 12, a reinforcing rib portion 13, a reinforcing rib 14, a weight-reducing cavity 15, and a connecting rib 16. The bearing shoulder 11 is located in the inner cavity of the wheel hub 10 to abut against the bearing and prevent the bearing from moving axially. The flange portion 12 is located at the axial end of the wheel hub 10 to connect to the vehicle chassis system. The reinforcing rib portion 13 and the reinforcing rib 14 are located on the side of the flange portion 12. The weight-reducing cavity 15 is connected to the side of the reinforcing rib 14 away from the flange portion 12. The connecting rib 16 is formed between two adjacent weight-reducing cavities 15, and the reinforcing rib 14 and the connecting rib 16 are arranged in a one-to-one correspondence.

[0042] See Figure 4The wheel hub 10 casting blank cast by the wheel hub casting mold also includes a feeding structure 17, which is connected to the bearing shoulder 11.

[0043] See Figure 5-10 The wheel hub casting mold may include a lower sand mold 20, an upper sand mold 30, a lower mold 40, an upper mold 50, a first inner core 60, and a second inner core 70. Both the lower sand mold 20 and the upper sand mold 30 are capable of casting. This allows the lower mold 40 and the upper mold 50 to perform casting within the lower sand mold 20 and the upper sand mold 30 respectively, resulting in a lower cavity 21 within the lower sand mold 20 and an upper cavity 31 within the upper sand mold 30. Simultaneously, when the upper sand mold 30 is placed on top of the lower sand mold 20, the upper cavity 31 communicates with the lower cavity 21 to form a cavity 211.

[0044] In this embodiment, the first inner core 60 can be accommodated within the cavity 211, with its bottom abutting against the bottom of the lower cavity 21 and its top extending into the upper cavity 31. The second inner core 70 can be accommodated within the cavity 211, with its top abutting against the first inner core 60. Thus, during casting, the cavity 211, the first inner core 60, and the second inner core 70 can together form the hub 10.

[0045] It should be noted that a recessed portion 71 is provided on the outer peripheral side of the second inner core 70, and the recessed portion 71 is arranged circumferentially along the second inner core 70. During casting, the bearing shoulder 11 of the hub 10 can be formed in the recessed portion 71. At the same time, a feeding space 72 is provided in the second inner core 70, and a through feeding hole 73 is opened on the side wall of the second inner core 70. One end of the feeding hole 73 is connected to the feeding space 72, and the other end is connected to the recessed portion 71, so that the feeding space 72 can be connected to the cavity 211. During casting, the casting can flow from the cavity 211 to the feeding space 72. When the casting cools, the casting in the feeding space 72 can flow along the feeding hole 73 to the cavity 211 and feed the hub 10 casting, thereby improving defects such as shrinkage porosity and shrinkage cavities generated during the casting process of the hub 10 and improving the yield of hub casting.

[0046] Furthermore, the wheel hub casting mold may also include a riser sleeve 75. The riser sleeve 75 is housed within the upper cavity 31 and is connected to the top of the second inner core 70. Simultaneously, the riser or chamber of the riser sleeve 75 communicates with the feeding space 72. Specifically, the riser sleeve 75 can be used to generate heat and provide pressure, so that the heat generated by the riser sleeve 75 acts on the casting within the feeding space 72, preventing the casting from cooling and keeping it in a liquid state. At the same time, the pressure generated by the riser sleeve 75 can push the liquid casting out of the feeding space 72, allowing the liquid casting within the feeding space 72 to flow through the feeding hole 73 into the mold cavity 211, thus feeding the wheel hub 10 casting.

[0047] Furthermore, after the casting cools, the casting material within the feeding space 72 and the feeding hole 73 can form a feeding structure 17, and the feeding structure 17 is connected to the side wall of the inner cavity of the hub 10, such as... Figure 4 As shown.

[0048] Because the wall thickness at the bearing shoulder 11 on the hub 10 is relatively thick, shrinkage cavities and porosity are easily generated on the side wall of the bearing shoulder 11 when the casting is cooled. Therefore, one end of the shrinkage filling hole 73 is connected to the recessed part 71. During the casting process, the casting in the shrinkage filling space 72 can fill the bearing shoulder 11 and the surrounding side wall, thereby improving the defects such as shrinkage porosity and shrinkage cavities generated in the hub 10 during the casting process.

[0049] See Figure 8 and Figure 9 The upper mold 50 may be provided with a flange boss 51, so that when the upper mold 50 is casting in the upper sand mold 30, the flange boss 51 can form a flange groove 32 in the upper cavity 31. During casting, the flange portion 12 of the hub 10 can be formed in the flange groove 32.

[0050] See Figure 6 and Figure 7 The lower mold 40 may be provided with a main body 41, a reinforcing step 42, and multiple reinforcing grooves 43. The reinforcing step 42 is located on the outer periphery of the main body 41, and the reinforcing grooves 43 are located on the reinforcing step 42 and recessed along the axial direction of the main body 41. That is, the reinforcing grooves 43 are recessed from the step surface of the reinforcing step 42 towards the main body of the lower mold 40, thus forming a recessed space. Simultaneously, the multiple reinforcing grooves 43 are spaced apart circumferentially around the main body 41, i.e., multiple reinforcing grooves 43 surround the periphery of the main body 41 and are located on the reinforcing step 42.

[0051] When the lower mold 40 is cast within the lower sand mold 20, the main body 41 and the reinforcing step 42 form the lower cavity 21, and multiple reinforcing grooves 43 form protruding reinforcing parts 22 within the lower cavity 21. During casting, the reinforcing parts 22 form reinforcing ribs 13 of the hub 10, and the reinforcing ribs 13 are recessed from the end of the hub 10 toward the center of the hub 10. The reinforcing ribs 13 are connected to the flange 12, and two adjacent reinforcing ribs 13 can form a reinforcing rib 14, such as... Figure 3 As shown.

[0052] It should be noted that during the casting process of the wheel hub 10, the reinforcing rib 14 can compensate for the shrinkage of the flange portion 12 and the side wall connected to it. That is, during the cooling process of the casting, the casting material at the reinforcing rib 14 can compensate for the shrinkage of the flange portion 12 and the side wall connected to the reinforcing rib 14, thereby improving defects such as shrinkage porosity and shrinkage cavities that occur in the flange portion 12 and the side wall during the casting process of the wheel hub 10. In addition, since the reinforcing rib 14 can be designed with redundancy to reserve the amount of shrinkage compensation in advance, the structural strength of the reinforcing rib 14 after shrinkage compensation can still meet the strength requirements of the wheel hub 10.

[0053] Figure 11 yes Figure 1 Another schematic diagram of the first and second inner cores of the wheel hub casting mold. Figure 12 yes Figure 1 Exploded view of the first and second inner cores of the wheel hub casting mold.

[0054] See Figure 10 , Figure 11 and Figure 12 The first inner core 60 may be provided with an inner core body 61 and a plurality of weight-reducing parts 62. The weight-reducing parts 62 are disposed on the outer periphery of the inner core body 61, and the plurality of weight-reducing parts 62 are spaced apart circumferentially around the inner core body 61. Simultaneously, the length direction of the weight-reducing parts 62 extends along the axial direction of the inner core body 61, and the free ends of the weight-reducing parts 62 are spaced apart from the inner core body 61.

[0055] During casting, the weight-reducing part 62 can form the weight-reducing cavity 15 of the hub 10, such as Figure 3 As shown, multiple weight-reducing sections 62 can form multiple weight-reducing cavities 15 in the wheel hub 10, thereby reducing the overall weight of the wheel hub 10. Simultaneously, the weight-reducing cavities 15 are connected to the reinforcing ribs 13 and are located on the side of the reinforcing ribs 13 opposite to the flange portion 12. A connecting rib 16 is formed between two weight-reducing cavities 15, and the connecting rib 16 is correspondingly arranged with the reinforcing ribs 14, thereby ensuring the structural strength between the reinforcing ribs 13 and the weight-reducing cavities 15, and thus guaranteeing the structural strength of the wheel hub 10.

[0056] See Figure 6 , Figure 7 and Figure 11, an installation part 63 is provided at the bottom of the inner core main body 61, and the installation part 63 has a "convex" structure. At the same time, an installation protrusion 411 is provided on the main body part 41 of the lower mold 40, and the installation protrusion 411 protrudes from the end of the main body part 41. When the lower mold 40 is cast in the lower sand tire 20, the installation protrusion 411 can form an installation groove 23 in the lower cavity part 21. At the same time, the installation groove 23 is a "convex"-shaped concave structure, and the installation groove 23 is adapted to the installation part 63, so that the installation groove 23 can be used to connect the installation part 63 and can support and limit the installation part 63, thereby preventing the first inner core 60 from rotating relative to the lower mold 40.

[0057] In this embodiment, a weight reduction cavity 65 is further provided on the inner core main body 61, and the weight reduction cavity 65 is recessed from the end face of the installation part 63 towards the center direction of the inner core main body 61, so as to reduce the overall weight of the first inner core 60.

[0058] Refer to Figure 12 , a positioning groove part 64 is provided at the top of the inner core main body 61, that is, a positioning groove part 64 is provided on one side of the inner core main body 61 axially opposite to the installation part 63. At the same time, a positioning protrusion 74 is provided at the bottom of the second inner core 70. When the second inner core 70 abuts against the top of the first inner core 60, the positioning protrusion 74 can be inserted into the positioning groove part 64 and form a limit for the first inner core 60 and the second inner core 70.

[0059] In this embodiment, the positioning groove part 64 is provided with a plurality of positioning holes, and the positioning protrusion 74 is provided with a plurality of positioning pins. When the second inner core 70 abuts against the top of the first inner core 60, the positioning pins can be inserted into the positioning holes, so that the second inner core 70 is stably connected to the first inner core 60 and prevents relative rotation between the second inner core 70 and the first inner core 60.

[0060] In some other embodiments, the positioning groove part 64 can be provided with a clamping structure, and the positioning protrusion 74 can be provided with a buckle structure, so that when the second inner core 70 abuts against the top of the first inner core 60, the clamping structure and the buckle structure cooperate with each other, so that the second inner core 70 is stably connected to the first inner core 60 and prevents relative rotation between the second inner core 70 and the first inner core 60.

[0061] Refer to Figure 12 , a recessed part 66 is further provided on the inner core main body 61, and the recessed part 66 corresponds to the recessed part 71, so that when casting, the recessed part 66 and the recessed part 71 together form the bearing shoulder 11 of the wheel hub 10.

[0062] Meanwhile, the inner core body 61 is also provided with a shrinkage groove 67 and a shrinkage opening 68. The shrinkage groove 67 and the shrinkage opening 68 are respectively provided for the shrinkage space 72 and the shrinkage hole 73, so that when the second inner core 70 abuts against the top of the first inner core 60, the shrinkage groove 67 and the shrinkage opening 68 are respectively connected to the shrinkage space 72 and the shrinkage hole 73, thereby enabling a shrinkage structure to be formed between the first inner core 60 and the second inner core 70.

[0063] See Figure 6 , Figure 7 , Figure 8 and Figure 9 The upper mold 50 may also be provided with a sprue 52, a filter 53, an ingate 54, and an exhaust 55. When the upper mold 50 is casting on the upper sand mold 30, the sprue 52, the filter 53, the ingate 54, and the exhaust 55 respectively form a sprue 33, a filter cavity 34, an ingate 35, and an exhaust channel 36 on the upper sand mold 30. At the same time, the lower mold 40 may also be provided with a gating section 44. When the lower mold 40 is casting on the lower sand mold 20, the gating section 44 can form a gating channel 24 on the lower sand mold 20.

[0064] The sprue 33 connects the casting gate and the filter chamber 44, while the runner 24 connects the filter chamber 44 and the ingate 35. The ingate 35 extends into the mold cavity 211, allowing the casting to flow into the cavity 211. It should be noted that the filter chamber 34 is equipped with a filter block to filter the liquid casting, ensuring its cleanliness and thus guaranteeing the yield of the castings.

[0065] Figure 13 This is a schematic diagram of the first core mold of the hub core box according to an embodiment of the present utility model. Figure 14 yes Figure 13 A schematic diagram of the second core mold of the hub core box.

[0066] See Figure 13 and Figure 14 The hub core box in this embodiment can be used to make the first inner core 60 and the second inner core 70.

[0067] Specifically, the hub core box may include a first core mold 80 and a second core mold 90. The second core mold 90 can be fitted onto the first core mold 80, meaning the first core mold 80 and the second core mold 90 can be assembled. The first core mold 80 has a first lower cavity 81 and a second lower cavity 82, and the second core mold 90 has a first upper cavity 91 and a second upper cavity 92. When the second core mold 90 is fitted onto the first core mold 80, the first lower cavity 81 and the first upper cavity 91 communicate to form a first chamber, and the second lower cavity 82 and the second upper cavity 92 communicate to form a second chamber. During core making, the first chamber can be used to make a first inner core 60, and the second chamber can be used to make a second inner core 70.

[0068] See Figure 13 The first lower cavity 81 is provided with a main cavity 83 and multiple weight-reducing cavities 84. During core making, the main cavity 83 and the weight-reducing cavities 84 are used to form the inner core main body 61 and the weight-reducing part 62 of the first inner core 60, respectively.

[0069] In addition, a shrinkage protrusion 87 and a shrinkage section 88 are provided in the first lower cavity 81. The shrinkage section 88 is connected to the shrinkage protrusion 87. During core making, the shrinkage protrusion 87 and the shrinkage section 88 are used to make the shrinkage groove 67 and the shrinkage opening 68 on the inner core body 61, respectively.

[0070] Additionally, a shrinkage-compensating protrusion 85 and a connecting portion 86 are provided within the second lower cavity 82. The shrinkage-compensating protrusion 85 protrudes from the bottom of the second lower cavity 82, and the connecting portion 86 connects the outer periphery of the shrinkage-compensating protrusion 85 between the outer periphery of the second lower cavity 82 and the inner wall of the second lower cavity 82, and is connected to the bottom of the second lower cavity 82. A shrinkage-compensating portion is provided within the second upper cavity 92. During core making, the shrinkage-compensating protrusion 85 and the shrinkage-compensating portion are used to form a shrinkage-compensating space 72, and the connecting portion 86 is used to form a shrinkage-compensating hole 73.

[0071] See Figure 14 An mounting chamber 93 and a weight-reducing protrusion 94 are formed within the first upper cavity 91. The mounting chamber 93 is open to the side facing the first lower cavity 81, and the weight-reducing protrusion 94 is located within the mounting chamber 93 and connected to the side of the mounting chamber 93 opposite to the first lower cavity 81. During core making, the mounting chamber 93 and the weight-reducing protrusion 94 together form the mounting portion 63 of the first inner core 60, and the weight-reducing protrusion 94 can form a weight-reducing cavity 65 on the inner core body 61.

[0072] In summary, the lower sand mold 20 and the upper sand mold 30 can be cast in the lower mold 40 and the upper mold 50 respectively, and the lower cavity 21 and the upper cavity 31 are obtained in the lower mold 40 and the upper mold 50 respectively. When the mold is closed, the lower cavity 21 and the upper cavity 31 are connected to form the cavity 211. At the same time, the first inner core 60 and the second inner core 70 are both housed in the cavity 211. The bottom of the first inner core 60 abuts against the bottom of the lower cavity 21, and the top of the first inner core 60 extends into the upper cavity 31. The second inner core 70 abuts against the top of the first inner core 60. Thus, during casting, the cavity 211, the first inner core 60 and the second inner core 70 together form the hub 10. In addition, a recess 71 is provided on the outer periphery of the second inner core 70, and the recess 71 is arranged along the circumference of the second inner core 70 so that during casting, the recess 71 can form the bearing shoulder 11 of the hub 10. The second inner core 70 has a feeding space 72, and a feeding hole 73 is formed on the inner wall of the second inner core 70. One end of the feeding hole 73 is connected to the feeding space 72, and the other end is connected to the recess 71. Thus, during casting, the casting material in the feeding space 72 can feed the bearing shoulder 11 on the wheel hub 10 casting. Since the wall thickness at the bearing shoulder 11 is relatively large, shrinkage cavities and porosity are easily generated when the casting cools. Therefore, the casting material in the feeding space 72 can feed the bearing shoulder 11, which can improve defects such as shrinkage cavities and porosity at the bearing shoulder 11, thereby improving defects such as shrinkage porosity and shrinkage cavities generated during the casting process and improving the yield of wheel hub casting.

[0073] 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 casting mold characterized by, The wheel hub casting mold includes: The lower sand mold is used for casting. The sand casting mold is used for casting. The lower mold is capable of casting within the lower sand mold to obtain a lower cavity within the lower sand mold; The upper mold is capable of casting within the upper sand mold to obtain an upper cavity within the upper sand mold. When the upper sand mold covers the lower sand mold, the upper cavity communicates with the lower cavity and forms a mold cavity. A first inner core is housed within the cavity, with its bottom abutting against the bottom of the lower cavity and its top extending into the upper cavity. A second inner core is housed within the cavity, and the second inner core abuts against the top of the first inner core, so that during casting, the cavity, the first inner core, and the second inner core form a hub; The second inner core has a recessed portion on its outer peripheral side, which is arranged along the circumference of the second inner core to form a bearing shoulder of the hub during casting. The second inner core has a shrinkage compensation space, and a through shrinkage compensation hole is opened on the side wall of the second inner core. One end of the shrinkage compensation hole is connected to the shrinkage compensation space, and the other end is connected to the recessed portion.

2. The wheel hub casting mold of claim 1, wherein, The upper mold is provided with a flange boss. When the upper mold is cast in the upper sand mold, the flange boss can form a flange groove in the upper cavity. During casting, the flange of the hub is formed in the flange groove. The lower mold is provided with a main body, a reinforcing step, and multiple reinforcing grooves. The reinforcing step is provided on the outer periphery of the main body. The reinforcing grooves are provided on the reinforcing step and are recessed along the axial direction of the main body. The multiple reinforcing grooves are spaced apart circumferentially along the main body. When the lower mold is cast in the lower sand mold, the main body and the reinforcing step can form the lower cavity. The multiple reinforcing grooves can form a reinforcing part in the lower cavity. During casting, the reinforcing part can form a reinforcing rib of the hub. The reinforcing rib is connected to the flange. Two adjacent reinforcing ribs can form a reinforcing rib.

3. The wheel hub casting mold of claim 2, wherein, The first inner core is provided with an inner core body and a plurality of weight-reducing parts. The weight-reducing parts are disposed on the outer peripheral side of the inner core body. The plurality of weight-reducing parts are spaced apart circumferentially along the inner core body. The length direction of the weight-reducing parts extends along the axial direction of the inner core body. During casting, the weight-reducing parts can form the weight-reducing cavity of the hub. The weight-reducing cavity is connected to the reinforcing rib and is located on the side of the reinforcing rib away from the flange. A connecting rib is formed between two weight-reducing cavities. The connecting rib is correspondingly disposed to the reinforcing rib.

4. The wheel hub casting mold of claim 3, wherein, The bottom of the inner core body is provided with an installation part, and the end of the body part is provided with an installation protrusion. When the lower mold is casting in the lower sand mold, the installation protrusion can form an installation groove in the lower cavity. The installation groove is used to connect the installation part. The installation groove is adapted to the installation part, so that the installation groove can support and limit the installation part.

5. The wheel hub casting mold of claim 3, wherein, The top of the inner core body is provided with a positioning groove, and the bottom of the second inner core is provided with a positioning protrusion. When the second inner core can abut against the top of the first inner core, the positioning protrusion can be inserted into the positioning groove and limit the first inner core and the second inner core.

6. The wheel hub casting mold of claim 1, wherein, It also includes a riser sleeve, which is housed within the upper cavity and connected to the top of the second inner core, and the chamber of the riser sleeve is in communication with the compensation space.

7. A hub core box for making the first and second inner cores of any one of claims 1-6, wherein, The hub core box includes a first core mold and a second core mold that can be covered on the first core mold. The first core mold is provided with a first lower cavity and a second lower cavity, and the second core mold is provided with a first upper cavity and a second upper cavity. When the second core mold is covered on the first core mold, the first lower cavity and the first upper cavity communicate to form a first chamber, and the second lower cavity and the second upper cavity communicate to form a second chamber. During core making, the first chamber is used to make the first inner core, and the second chamber is used to make the second inner core.

8. The wheel hub cartridge of claim 7, wherein, The first lower cavity is provided with a main body chamber and multiple weight-reducing chambers. During core making, the main body chamber and the weight-reducing chambers are used to form the inner core body and weight-reducing part of the first inner core, respectively.

9. The wheel hub cartridge of claim 7, wherein, An mounting chamber and a weight-reducing protrusion are formed in the first upper cavity. The mounting chamber is open to the side facing the first lower cavity. The weight-reducing protrusion is located in the mounting chamber and connected to the side of the mounting chamber away from the first lower cavity. During core making, the mounting chamber and the weight-reducing protrusion together form the mounting part of the first inner core.

10. The wheel hub cartridge of claim 7, wherein, The second lower cavity is provided with a shrinkage-compensating protrusion and a connecting portion. The shrinkage-compensating protrusion protrudes from the bottom of the second lower cavity, and the connecting portion connects the outer periphery of the shrinkage-compensating protrusion and the inner wall of the second lower cavity, and is connected to the bottom of the second lower cavity. The second upper cavity is provided with a shrinkage-compensating portion. During core making, the shrinkage-compensating protrusion and the shrinkage-compensating portion are used to form the shrinkage-compensating space, and the connecting portion is used to form the shrinkage-compensating hole.

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