Runner for hub and hub casting mold

Abstract

The utility model provides a runner for a wheel hub and a wheel hub pouring mould, the runner for the wheel hub comprises a pouring cup, an inclined outer cylinder and a straight pouring cylinder which are integrally formed from top to bottom, and a mounting seat is used for being assembled with the mould; an opening of the pouring cup is communicated with a mold cavity, and a bottom opening of the mounting seat is communicated with a heat preservation furnace; wherein the axial diameter of the inclined outer cylinder is gradually increased from top to bottom. According to the pouring gate for the hub, the inclined outer cylinder and the straight pouring cylinder are arranged, and due to the arrangement of the inclined outer cylinder, the size of the pouring gate is widened, the volume of the pouring gate is increased, the amount of molten aluminum capable of being stored is increased, and volume feeding generated after a product is solidified and shrunk is improved; the amount of the molten aluminum stored in a single time is increased, the temperature of the molten aluminum is reduced slowly in the waiting process, the temperature reduction amplitude of the molten aluminum entering a mold cavity is small, the dead head is not prone to being scrapped, and the yield of hubs is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel hub molds, and particularly relates to a runner for a wheel hub and a wheel hub casting mold. Background Art

[0002] The wheel hub is an important component of an automobile, and most of them are cast by molds. The runner in the wheel hub mold can guide the molten metal so that the molten metal fills the cavity of the wheel hub mold, thereby shaping the wheel hub.

[0003] However, the existing runner is a straight cylindrical runner. Limited by the minimum wheel center size of the wheel hub, the runner has a small capacity, cannot effectively supplement the molten aluminum in the cavity of the casting mold in time, and cannot compensate for the volume change generated after the product solidifies and shrinks, resulting in shrinkage porosity in the product; after the molten aluminum is injected into the runner, it is easy to reduce the temperature of the molten aluminum during the waiting process, affecting the casting effect, causing the riser on the product to be easily scrapped, and increasing the use cost. Summary of the Utility Model

[0004] An embodiment of the utility model provides a runner for a wheel hub, aiming to solve the technical problems in the prior art that the runner has a small capacity, resulting in poor feeding ability and easy shrinkage porosity and scrapping of the riser.

[0005] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0006] In a first aspect, a runner for a wheel hub is provided, which includes a sprue cup, an inclined outer cylinder, and a straight sprue cylinder integrally formed from top to bottom. An installation seat is provided on the outer periphery of the straight sprue cylinder, and the installation seat is used for assembling with the mold;

[0007] The opening of the sprue cup is communicated with the cavity of the mold, and the bottom opening of the installation seat is communicated with the holding furnace;

[0008] Wherein, the axial diameter of the inclined outer cylinder gradually increases from top to bottom.

[0009] In combination with the first aspect, in a possible implementation manner, the inner diameter of the bottom opening of the inclined outer cylinder is the same as the inner diameter of the straight sprue cylinder.

[0010] In combination with the first aspect, in a possible implementation manner, the outer shape of the inclined outer cylinder is in the shape of a truncated cone.

[0011] In combination with the first aspect, in a possible implementation manner, the wall thicknesses of both the straight sprue cylinder and the inclined outer cylinder are 7-9 mm.

[0012] In combination with the first aspect, in a possible implementation manner, both the inclined outer cylinder and the straight sprue cylinder are silicon nitride components.

[0013] In combination with the first aspect, in a possible implementation, the inner diameter of the top opening of the sprue cup is greater than the inner diameter of the bottom opening of the sprue cup.

[0014] In combination with the first aspect, in a possible implementation, a clamping groove is provided on the outer periphery of the mounting seat, and the clamping groove is used for clamping and positioning with the mold.

[0015] Compared with the prior art, the runner for the hub provided by the present utility model is provided with an inclined outer cylinder and a straight sprue cylinder. The setting of the inclined outer cylinder widens the size of the runner, increases the volume, increases the amount of molten aluminum that can be stored, improves the volume compensation for the shrinkage after solidification of the product, and there will be no problem of insufficient compensation amount; the amount of molten aluminum stored at one time increases, the temperature of the molten aluminum decreases slowly during the waiting process, the temperature decrease range of the molten aluminum entering the mold cavity is small, the riser is not easily scrapped, and the qualified rate of the hub is improved.

[0016] In a second aspect, a hub casting mold is provided, including:

[0017] A bottom mold, with a pouring channel provided in the middle, and a runner for the hub as described in any one of the above possible implementations is provided in the pouring channel;

[0018] A plurality of side molds, arranged around the upper surface of the bottom mold; and

[0019] A top mold, covering the tops of the plurality of side molds, and the top mold, the plurality of side molds and the bottom mold enclose a cavity for forming the hub, and the runner for the hub communicates with the cavity.

[0020] In combination with the second aspect, in a possible implementation, a plurality of mounting brackets are provided on the outer periphery of the bottom mold, and a mounting space is formed between two adjacent mounting brackets, and the side mold is hermetically connected to the corresponding mounting space.

[0021] In combination with the second aspect, in a possible implementation, the hub casting mold further includes a cooling system assembly, the cooling assembly has a first circulation pipe and a second circulation pipe, and cooling media flow in the first circulation pipe and the second circulation pipe respectively;

[0022] The top mold is provided with a first cooling cavity corresponding to the first circulation pipe, the first cooling cavity communicates with the first circulation pipe, the bottom mold is provided with a second cooling cavity corresponding to the second circulation pipe, and the second cooling cavity communicates with the second circulation pipe.

[0023] The hub casting mold provided by the present utility model, compared with the prior art, is provided with an inclined outer cylinder and a straight pouring cylinder. The setting of the inclined outer cylinder widens the size of the pouring channel, increases the volume, increases the amount of molten aluminum that can be stored, improves the volume compensation for the shrinkage after solidification of the product, and there will be no problem of insufficient compensation amount; the amount of molten aluminum stored at one time increases, the temperature of the molten aluminum decreases slowly during the waiting process, the temperature drop of the molten aluminum entering the mold cavity is small, and the riser is not easily scrapped, improving the yield rate of the hub; multiple side molds are installed above the bottom mold, and the top mold is installed above the side mold, with low assembly difficulty and high assembly efficiency. The pouring channel is communicated with the cavity of the mold, and the cavity is compensated through the pouring channel. The volume of the pouring channel is large, which can meet the compensation requirements and improve the forming quality of the hub blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is the front view structural schematic diagram of the pouring channel for the hub provided by the embodiment of the present utility model;

[0026] Figure 2 For Figure 1 the cross-sectional view of the pouring channel adopted in

[0027] Figure 3 It is the front view structural schematic diagram of the hub casting mold adopted in the embodiment of the present utility model;

[0028] Figure 4 It is the assembly schematic diagram of the bottom mold and the cooling assembly adopted in the embodiment of the present utility model.

[0029] Description of the reference numerals:

[0030] 1, pouring cup;

[0031] 2, inclined outer cylinder;

[0032] 3, straight pouring cylinder;

[0033] 4, mounting seat; 41, clamping groove;

[0034] 5, bottom mold; 51, mounting frame;

[0035] 6, side mold;

[0036] 7, top mold;

[0037] 8. Cooling assembly; 81. First circulation pipe; 82. Second circulation pipe; 83. Cooling body. Detailed implementation

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0039] It should be noted that the orientation or positional relationship indicated by the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model.

[0040] It should also be noted that unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In addition, the meanings of "multiple" and "several" are two or more, unless otherwise specifically defined.

[0042] Please refer to Figures 1 to 4 , and now the runner for the hub provided by the present utility model will be described. The runner for the hub includes a sprue cup 1, an inclined outer cylinder 2 and a straight sprue cylinder 3 integrally formed from top to bottom. An installation seat 4 is provided on the outer periphery of the straight sprue cylinder 3, and the installation seat 4 is used for assembling with the mold; the opening of the sprue cup 1 is communicated with the mold cavity, and the bottom opening of the installation seat 4 is communicated with the holding furnace; wherein, the axial diameter of the inclined outer cylinder 2 gradually increases from top to bottom.

[0043] It should be noted that the pouring cup 1, the inclined outer cylinder 2, the straight pouring cylinder 3 and the mounting seat 4 are integrally cast, which increases the strength of the overall structure. The interiors of the pouring cup 1, the inclined outer cylinder 2 and the straight pouring cylinder 3 are connected to form a pouring channel for the molten aluminum to pass through.

[0044] It should be noted that the pouring channel for the hub provided in this embodiment is applicable to the pouring channel in low-pressure casting. Low-pressure casting means that dry compressed air is filled into a closed heat-insulating furnace, so that the molten aluminum rises along the riser pipe under the action of pressure, enters the mold cavity through the pouring channel, and maintains a certain pressure. At the same time, the mold is forced to cool, so that the molten aluminum solidifies sequentially in the cavity to form a hub blank. After the molten aluminum enters the cavity, a part of the molten aluminum is placed in the pouring channel. After the molten aluminum in the cavity begins to solidify, the molten aluminum in the pouring channel begins to compensate for shrinkage to ensure the quality of the hub blank.

[0045] Compared with the prior art, the pouring channel for the hub provided in this embodiment is provided with an inclined outer cylinder 2 and a straight pouring cylinder 3. The setting of the inclined outer cylinder 2 widens the size of the pouring channel, increases the volume, increases the amount of molten aluminum that can be stored, improves the volume compensation for the shrinkage after the product solidifies, and does not have the problem of insufficient compensation amount; the amount of molten aluminum stored at one time increases, the temperature of the molten aluminum decreases slowly during the waiting process, the temperature drop of the molten aluminum entering the mold cavity is small, and the riser is not easily scrapped, improving the qualified rate of the hub.

[0046] In some embodiments, the inner diameter of the bottom opening of the inclined outer cylinder 2 is the same as the inner diameter of the straight pouring cylinder 3. The molten aluminum enters the inclined outer cylinder 2 from the straight pouring cylinder 3. The inner diameter of the bottom opening of the inclined outer cylinder 2 is the same as the inner diameter of the straight pouring cylinder 3, which can increase the volume of the pouring channel, the molten aluminum can enter the cavity regularly, and the resistance of the inclined outer cylinder 2 to the molten aluminum can be reduced.

[0047] In some embodiments, refer to Figure 1 , the outer shape of the inclined outer cylinder 2 is in the shape of a truncated cone. The design of the truncated cone shape makes the axial diameter of the inclined outer cylinder 2 gradually decrease from bottom to top, so that the molten aluminum moves along the pouring channel regularly, which is convenient to control the entry speed of the molten aluminum; at the same time, the outer shape of the inclined outer cylinder 2 is a regular shape, which is convenient to install the pouring channel for the hub into the mold and reduces the installation difficulty. After the pouring channel is installed, the mold will limit the inclined outer cylinder 2 from above to prevent the whole pouring channel from moving upward and avoid the pouring channel entering the cavity and affecting the forming quality of the hub blank.

[0048] In some embodiments, the wall thicknesses of both the straight pouring cylinder 3 and the inclined outer cylinder 2 are 7-9 mm. The wall thicknesses of the straight pouring cylinder 3 and the inclined outer cylinder 2 are between 7 and 9 mm, and the formed pouring channel has high strength and meets the use requirements. When in use, the wall thickness of the pouring cup 1 is also 7-9 mm.

[0049] Specifically, during implementation, the wall thicknesses of both the straight pouring cylinder 3 and the inclined outer cylinder 2 are 8 mm.

[0050] In some embodiments, both the inclined outer cylinder 2 and the straight pouring cylinder 3 are silicon nitride components. Silicon nitride material is an inorganic material that does not shrink during sintering. Silicon nitride has high strength and properties such as high strength, low density, and high temperature resistance. It is not affected by the high temperature of molten aluminum, and its strength can be maintained up to a high temperature of 1200 °C without decreasing. It will not melt into a melt after being heated, meeting the usage requirements.

[0051] It should be noted that in the existing runners in this field, ceramics are used as the manufacturing material for the runners. To meet the usage strength requirements, the thickness of the ceramic-made runner is 12 mm. The silicon nitride material in this application has high strength. When the requirements are met, the wall thickness can be reduced, thereby increasing the volume of the runner.

[0052] In some embodiments, referring to Figure 2 , the inner diameter of the top opening of the sprue cup 1 is larger than the inner diameter of the bottom opening of the sprue cup 1. The sprue cup 1 is communicated with the cavity. The sprue cup 1 can reduce the impact force of the molten metal, reduce the direct impact on the mold, and avoid damage to the mold; the horn-shaped design enables the sprue cup 1 to have a certain buffering effect, buffering the speed of the molten aluminum entering the cavity and avoiding turbulence.

[0053] During specific implementation, the sprue cup 1 can be a horn-shaped structure with an upward opening, or a structure with an inner diameter gradually increasing from bottom to top.

[0054] In some embodiments, referring to Figure 1 , a clamping groove 41 is provided on the outer periphery of the mounting seat 4. The clamping groove 41 is used for clamping and positioning with the mold. The mold has a clamping protrusion corresponding to the clamping groove 41. When the runner is installed on the hub casting mold, the clamping groove 41 and the clamping protrusion are clamped and matched to limit the runner in the circumferential direction of the runner, ensuring the use stability of the runner.

[0055] During specific implementation, the inclined outer cylinder 2 is attached to the mold to limit the runner in the axial direction of the runner, and cooperate with the mounting seat 4 to fix the runner on the mold.

[0056] Based on the same inventive concept, referring to Figure 3 and Figure 4 , the present utility model also provides a hub casting mold, which includes a bottom mold 5, a plurality of side molds 6 and a top mold 7. A pouring channel is provided in the middle of the bottom mold 5, and a runner for the hub as described in any one of the above embodiments is provided in the pouring channel; a plurality of side molds 6 are arranged around the upper surface of the bottom mold 5; the top mold 7 is covered on the tops of the plurality of side molds 6, and the top mold 7, the plurality of side molds 6 and the bottom mold 5 enclose a cavity for forming a hub, and the runner for the hub is communicated with the cavity.

[0057] During specific implementation, the hub casting mold uses the low-pressure casting process to cast the hub blank. A holding furnace is provided at the bottom of the bottom mold 5. The holding furnace has a riser tube, and the riser tube is connected to the bottom opening of the runner. High-temperature aluminum liquid is present in the holding furnace. Compressed air is introduced into the high-temperature furnace, and the aluminum liquid rises along the riser tube under pressure, enters the runner, and then continues to rise into the cavity.

[0058] Compared with the prior art, the hub casting mold provided in this embodiment is provided with an inclined outer cylinder 2 and a straight runner cylinder 3. The setting of the inclined outer cylinder 2 widens the size of the runner, increases the volume, increases the amount of aluminum liquid that can be stored, improves the volume compensation for the shrinkage after solidification of the product, and does not have the problem of insufficient feeding amount; the amount of aluminum liquid stored at one time increases, the temperature of the aluminum liquid decreases slowly during the waiting process, the temperature drop of the aluminum liquid entering the mold cavity is small, the riser is not easily scrapped, and the qualified rate of the hub is improved; multiple side molds 6 are installed above the bottom mold 5, and the top mold 7 is installed above the side molds 6. The assembly difficulty is low and the assembly efficiency is high. The runner is connected to the cavity of the mold, and the cavity is compensated through the runner. The volume of the runner is large, which can meet the feeding requirements and improve the forming quality of the hub blank.

[0059] In some embodiments, referring to Figure 3 , a plurality of mounting brackets 51 are provided on the outer periphery of the bottom mold 5. An installation space is formed between two adjacent mounting brackets 51, and the side mold 6 is hermetically connected to the corresponding installation space. The mounting bracket 51 can position the side mold 6, facilitate the installation of the side mold 6, and the mounting bracket 51 can guide the splicing of a plurality of side molds 6 to maintain the stable forming of the cavity.

[0060] During specific implementation, there are 4 mounting brackets 51, which are respectively installed at the four corners of the bottom mold 5. The mounting bracket 51 is provided with a positioning groove corresponding to the side of the bottom mold 5, and the side mold 6 is correspondingly provided with a positioning protrusion. When the side mold 6 is installed, the positioning protrusion is hermetically inserted into the corresponding positioning groove, so that the side mold 6 and the bottom mold 5 are hermetically matched.

[0061] In some embodiments, referring to Figure 4 , the hub casting mold further includes a cooling assembly 8. The cooling assembly 8 has a first circulation pipe 81 and a second circulation pipe 82, and a cooling medium flows in the first circulation pipe 81 and the second circulation pipe 82 respectively; the top mold 7 is provided with a first cooling cavity corresponding to the first circulation pipe 81, and the first cooling cavity is connected to the first circulation pipe 81. The bottom mold 5 is provided with a second cooling cavity corresponding to the second circulation pipe 82, and the second cooling cavity is connected to the second circulation pipe 82. The cooling assembly 8 can forcibly cool the aluminum liquid in the cavity, facilitating the forming of the hub blank.

[0062] During specific implementation, the cooling medium is water, or it can also be low-temperature air, or it can be a combination of water mist and air.

[0063] During specific implementation, the cooling assembly 8 further includes a cooler 83, and the cooler 83 is respectively in circular communication with the first circulation pipe 81 and the second circulation pipe 82, facilitating the feeding of the cooling medium into the first cooling cavity and the second cooling cavity to forcibly cool the molten aluminum in the mold cavity, thus facilitating the forming of the wheel hub.

[0064] During specific implementation, the temperature of the molten aluminum reaching the mold cavity is 700 °C, and with the help of the cooling medium, it can be quickly reduced to the solidification temperature, improving the forming efficiency of the wheel hub.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A runner for a wheel hub, characterized in that: It includes a pouring cup, an inclined outer cylinder and a straight pouring cylinder which are integrally formed from top to bottom. The outer periphery of the straight pouring cylinder is provided with a mounting seat, and the mounting seat is used for assembly with the mold; The opening of the pouring cup is connected to the mold cavity, and the bottom opening of the mounting seat is connected to the insulation furnace; Wherein, the axial diameter of the inclined outer cylinder gradually increases from top to bottom.

2. The wheel hub runner according to claim 1, wherein: The inner diameter of the bottom opening of the inclined outer cylinder is the same as the inner diameter of the direct-cast cylinder.

3. The wheel hub runner according to claim 1, characterized in that: The outer shape of the inclined outer cylinder is a truncated cone.

4. The wheel hub runner according to claim 1, wherein: The wall thickness of the direct-cast cylinder and the inclined outer cylinder are both 7-9 mm.

5. The wheel hub runner according to claim 1, wherein: The inclined outer tube and the direct-cast tube are both silicon nitride components.

6. The runner for a wheel hub according to claim 1, characterized in that: The inner diameter of the top opening of the pouring cup is greater than the inner diameter of the bottom opening of the pouring cup.

7. The runner for a wheel hub according to claim 1, characterized in that: A clamping groove is arranged on the outer periphery of the mounting seat, and the clamping groove is used for clamping and positioning with the mold.

8. Wheel hub casting mold, characterized in that: include: A bottom mold, with a pouring channel in the middle, wherein the pouring channel is provided with a runner for the wheel hub as claimed in any one of claims 1 to 7; A plurality of side molds are arranged around the upper surface of the bottom mold; and The top mold is covered on the top of the plurality of side molds. The top mold, the plurality of side molds and the bottom mold together form a cavity for forming the wheel hub. The wheel hub is connected to the cavity by a runner.

9. The wheel hub casting mold according to claim 8, characterized in that: A plurality of mounting frames are arranged on the outer periphery of the bottom mold, and a mounting space is formed between two adjacent mounting frames. The side molds are sealingly connected to the corresponding mounting spaces.

10. The wheel hub casting mold according to claim 8, characterized in that: The wheel hub casting mold further comprises a cooling assembly, wherein the cooling assembly comprises a first circulation pipe and a second circulation pipe, wherein cooling medium flows in the first circulation pipe and the second circulation pipe respectively; The top mold is provided with a first cooling cavity corresponding to the first circulation pipe, and the first cooling cavity is communicated with the first circulation pipe. The bottom mold is provided with a second cooling cavity corresponding to the second circulation pipe, and the second cooling cavity is communicated with the second circulation pipe.

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