Die for hollow volute and hollow volute

Abstract

The utility model relates to the field of casting production and manufacturing, in particular to a hollow volute which comprises a volute body formed by integral casting, and the volute body comprises a middle hole body, a runner body and an exhaust body. A hollow hole is formed in the middle of the volute body. A mold for a hollow volute comprises an outer shell core, an inner channel core and a middle core, and the two ends of the middle core are connected with the inner wall face of the outer shell core. And the feeding hole is formed in the shell core. A hollow hole is formed in the middle of the poured volute, the overall weight of the volute is reduced, and the volute is light.

Description

Technical Field

[0001] This utility model relates to the field of casting production and manufacturing, specifically to a mold for hollow vortex shells and a hollow vortex shell. Background Technology

[0002] The turbocharger volute housing includes a central bore body, a flow channel body, and an exhaust body. An exhaust valve body is provided at the end of the exhaust body near the central bore body.

[0003] In the past, the turbocharger vortex housing was designed with a closed structure between the central hole body, the flow channel body, and the exhaust body to facilitate casting. That is, the three parts were directly connected by the casting at their intersection. During the casting process, because the middle part was a closed structure, the molten iron would flow to the middle position, which could ensure the temperature field in the middle of the casting cavity and thus prevent the middle position of the vortex housing from shrinking.

[0004] Because the turbocharger volute housing has a closed structure in the middle, the overall weight of the volute housing increases. This type of volute housing does not conform to the current trend of lightweighting. In order to achieve lightweighting of the volute housing, the applicant tried to change the original closed structure in the middle to an open structure, thereby reducing the overall weight of the volute housing by removing a portion of the molten iron in the middle of the volute housing. However, the problem with this open structure in the middle of the volute housing is that when the internal cavity of the cast volute housing is inspected for leakage, the air tightness is found to be lower than the required value, and shrinkage cavities are found on the outer surface of the exhaust valve body, with a scrap rate of almost 100%. The main reason is that the open structure in the middle of the volute housing causes the exhaust valve body to be separated from the central hole body and not directly connected. As a result, there is no feeding channel or feeding source at the shrinkage porosity of the exhaust valve body, and the casting forms poor shrinkage porosity during solidification. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a mold for hollow vortex shell and a hollow vortex shell, so as to solve the technical problem that the closed structure in the middle of the vortex shell makes it difficult to achieve lightweight processing and manufacturing.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] First aspect: A hollowed-out vortex shell is provided, including an integrally cast vortex shell body, the vortex shell body including a central hole body, a flow channel body and an exhaust body; a hollowed-out hole is opened in the middle of the vortex shell body, the hollowed-out hole being located at the intersection between the central hole body, the flow channel body and the exhaust body.

[0008] The second aspect provides a mold for a hollowed-out volute shell, including an outer shell core and an inner core, wherein the inner core is fixed inside the outer shell core, and a casting cavity is formed between the inner core and the outer shell core; the shape of the inner wall of the outer shell core is adapted to the shape of the outer surface of the volute shell, and the shape of the outer surface of the inner core is adapted to the shape of the inner wall of the volute shell; an intermediate core, the two ends of which are connected to the inner wall of the outer shell core, and the shape of the intermediate core is adapted to the shape of the hollowed-out hole, so that the volute shell poured in the casting cavity forms a hollowed-out hole; a shrinkage compensation hole, which is opened on the outer shell core, the outer end of which is connected to the riser on the outer shell core, the inner end of which is close to the intermediate core, and the inner wall of the shrinkage compensation hole is close to the area corresponding to the venting body in the casting cavity.

[0009] Furthermore, the compensation hole includes a straight channel and an arc channel, the arc shape of which is adapted to the curvature of the exhaust valve body on the exhaust body.

[0010] Third aspect: A method for manufacturing a hollow vortex shell using the above-mentioned mold is provided, including injecting molten metal into the casting cavity of the mold, the molten metal entering the feeding hole from the riser, the molten metal in the feeding hole raising the temperature field of the corresponding exhaust valve body area on the outer shell sand core, delaying the solidification time of the molten metal in the casting cavity of that area, thereby preventing the exhaust valve body on the exhaust body from shrinking and loosening.

[0011] The beneficial effects of this utility model are:

[0012] The cast vortex shell has a perforation in the middle, which reduces the overall weight of the vortex shell and achieves lightweight design.

[0013] The casting mold has feeding holes. The molten metal in the feeding holes can increase the temperature field, prolong the solidification time, prevent the casting near the vent valve body or the vortex shell from breaking, and improve the casting quality of the vented vortex shell. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of a hollowed-out vortex shell; Figure 2 This is a schematic diagram of the mold; Figure 3 This is a schematic diagram of the central core inside the casting cavity of the mold; Figure 4 This is a schematic diagram of the riser and the feeding iron block; Figure 5 This is a diagram showing the fit between the riser, the feeding block, and the vortex shell casting; where 1 is the vortex shell body, 11 is the central hole body, 12 is the flow channel body, 13 is the exhaust body, 131 is the exhaust valve body, and 14 is the perforation; 2 is the outer shell core, 21 is the intermediate core, 23 is the riser; 3 is the feeding hole, and 31 is the feeding block. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] This application provides a hollowed-out vortex shell, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0018] To address the technical problem in existing technologies where the central part of the vortex shell is a closed structure, making it difficult to achieve lightweight manufacturing, one embodiment of this application provides a hollowed-out vortex shell. This is described in detail below.

[0019] like Figure 1 As shown, a hollowed-out vortex shell includes an integrally cast vortex shell body 1, which includes a central hole body 11, a flow channel body 12, and an exhaust body 13; a hollow hole 14 is opened in the middle of the vortex shell body 1, and the hollow hole 14 is located at the intersection between the central hole body 11, the flow channel body 12, and the exhaust body 13.

[0020] The exhaust valve body 131 is located on the exhaust body 13, and the exhaust valve body 131 is used to install an exhaust valve inside it later.

[0021] The hollowed-out vortex shell of this embodiment has a perforation 14 in the middle, which reduces the weight of the entire vortex shell and achieves the lightweight development of the vortex shell.

[0022] To achieve the manufacturing of the aforementioned perforated vortex shell 14, this embodiment provides a mold for the perforated vortex shell.

[0023] like Figures 2 to 4As shown, the mold includes an outer shell core 2 and an inner core (not shown in the figure). The inner core is fixed inside the outer shell core 2, and a casting cavity is formed between the inner core and the outer shell core 2. The shape of the inner wall of the outer shell core 2 is adapted to the shape of the outer surface of the volute, and the shape of the outer surface of the inner core is adapted to the shape of the inner wall of the volute. There is an intermediate core 21, the two ends of which are connected to the inner wall of the outer shell core 2. The shape of the intermediate core 21 is adapted to the shape of the perforation 14 so that the volute cast in the casting cavity forms the perforation 14. There is a shrinkage hole 3, which is opened on the outer shell core 2. Its outer end is connected to the riser 23 on the outer shell core 2, its inner end is close to the intermediate core 21, and the inner wall of the shrinkage hole 3 is close to the area corresponding to the venting body 13 in the casting cavity.

[0024] In this embodiment, multiple risers 23 are provided on the outer shell core 2, and the risers 23 are configured according to the shape of the actual volute.

[0025] In this embodiment, the inner core structure can continue to refer to the previous structure. This embodiment only adds a shrinkage hole 3 and an intermediate core 21 to the outer core 2.

[0026] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5 As shown, the compensation hole 3 includes a straight channel and an arc channel, and the arc shape of the arc channel is adapted to the arc of the exhaust valve body 131 on the exhaust body 13.

[0027] The specific shape of the feeding hole 3 can be referenced. Figure 4 and Figure 5 The shape of the feeding block 31 is because the feeding block 31 is formed by the cooling of molten metal after it flows into the feeding hole 3. The shape of the feeding block 31 can directly reflect the shape of the feeding hole 3.

[0028] See Figure 4 The feeding block 31 includes a straight block and an arc block, which correspond to the straight channel and the arc channel, respectively. The straight block is on the outside, and the arc block is on the inside. The arc block corresponds to the curvature on the exhaust valve body 131. See [link to relevant documentation] for the curvature on the exhaust valve body 131. Figure 1 Specifically, the feeding hole 3 is opened at the arc surface near the hollow hole 14 on the exhaust valve body 131. This allows the molten metal entering the feeding hole 3 to raise the temperature field at this location, delaying the solidification time and preventing the middle part of the vortex casting from shrinking due to excessively low temperature, such as near the center of the exhaust valve body 131.

[0029] In this embodiment, the outer shell core 2 is composed of multiple sub-sand cores assembled together. Figure 3 The outer shell core 2 is just one of the sub-sand cores, and the middle core 21 is located inside the sub-sand core.

[0030] The method of manufacturing a hollow vortex shell using the above-mentioned mold includes pouring molten metal into the casting cavity of the mold. The molten metal is made of iron or steel. The molten metal enters the feeding hole 3 from the riser 23. The molten metal in the feeding hole 3 raises the temperature field of the area corresponding to the exhaust valve body 131 on the outer shell sand core, delaying the solidification time of the molten metal in the casting cavity in that area, thereby preventing the exhaust valve body 131 on the exhaust body 13 from shrinking and loosening.

[0031] After the vortex shell casting has cooled, the outer core 2 and inner core are separated from the vortex shell casting. The feeding iron block 31 is connected to the riser 23 casting. The riser 23 casting is then cut and separated from the vortex shell casting to obtain the vortex shell.

[0032] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0033] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0036] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0037] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0038] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hollowed-out vortex shell, comprising an integrally cast vortex shell body (1), characterized in that, The vortex body (1) includes a central hole body (11), a flow channel body (12), and an exhaust body (13). The vortex body (1) has a perforation (14) in the middle, and the perforation (14) is located at the intersection of the central hole body (11), the flow channel body (12) and the exhaust body (13).

2. A mold for hollowed-out vortex shells, characterized in that, It includes an outer shell core (2) and an inner core, wherein the inner core is fixed inside the outer shell core (2), and a casting cavity is formed between the inner core and the outer shell core (2); The inner wall shape of the outer shell core (2) is adapted to the outer surface shape of the vortex shell, and the outer surface shape of the inner channel core is adapted to the inner wall shape of the vortex shell; the middle core (21) has two ends connected to the inner wall of the outer shell core (2), and the shape of the middle core (21) is adapted to the shape of the perforation (14) so ​​that the vortex shell poured in the casting cavity forms the perforation (14); the shrinkage hole (3) is opened on the outer shell core (2), the outer end of the hole is connected to the riser (23) on the outer shell core (2), the inner end of the hole is close to the middle core (21), and the inner wall of the shrinkage hole (3) is close to the area corresponding to the exhaust body (13) in the casting cavity.

3. The mold for hollowed-out vortex shells according to claim 2, characterized in that, The compensation hole (3) includes a straight channel and an arc channel, and the arc shape of the arc channel is adapted to the arc of the exhaust valve body (131) on the exhaust body (13).

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