Sand core and volute casting
By designing a vertical burr structure in the sand core, the problem of lateral flash in volute castings was solved, achieving efficient flash removal and improved installation accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KEHUA HLDG
- Filing Date
- 2025-05-29
- Publication Date
- 2026-06-02
AI Technical Summary
The existing sand cores produce transverse flash when casting volute casing parts, which makes grinding inconvenient and affects the subsequent clamping accuracy, resulting in a high scrap rate.
Design a sand core in which a vertical burr is formed between the flow channel core and the outer shell core to avoid a horizontal burr. After casting, a vertical flash is formed, which can be easily removed by cutting.
It improves the efficiency of flash removal, simplifies the processing procedure, reduces the scrap rate, and ensures the installation accuracy of castings.
Smart Images
Figure CN224309567U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold casting, specifically to a sand core and volute casting. Background Technology
[0002] like Figure 1 The volute casting 1 shown is obtained by casting in a sand core, and then the casting is clamped on a lathe for turning. The flow channel on the volute casting 1 has a central hole 11, which serves as a reference hole for the casting on the lathe and is used to cooperate with the chuck on the chuck. Therefore, the casting accuracy of the central hole 11 of the casting will directly affect the installation accuracy of the casting on the lathe.
[0003] Current sand cores such as Figure 2 and Figure 3 As shown, it includes an outer shell core 4 and an inner shell core, with the inner shell core disposed within the outer shell core 4, forming a casting cavity between the outer shell core 4 and the inner shell core. Figure 2 and Figure 3 In the design, the position corresponding to the volute casting 1 is the casting cavity. The inner core is divided into multiple small inner cores according to the shape of the casting, among which the flow channel core 3 is part of the inner core, such as... Figure 4 and Figure 5 As shown, the flow channel core 3 includes an inner core 31 and a core head 33. Previous flow channel cores have been described in detail. Figure 5 As shown, the core head 33 is located at the front end of the core body 31 inside the hole. There is a step between the core head 33 and the core body 31 inside the hole, that is, a front end face 311 is formed at the front end of the core body 31 inside the hole. The front end face 311 abuts against the inner wall of the outer shell core 4, and the core head 33 is directly inserted into the outer shell core 4. Since the front end face 311 is in contact with the inner wall of the outer shell core 4, there is a transverse slit 21 between the front end of the core body 31 inside the hole and the outer shell core 4. Figure 3 As shown, molten iron in the casting cavity enters the transverse burr 21, resulting in transverse flash on the cast volute casting 1. The transverse flash is blocked at the front end of the central hole 11 of the volute. The subsequent treatment of the transverse flash is usually done by grinding on site, which wastes labor and is prone to missed grinding. As mentioned above, the central hole 11 is the reference hole of the volute casting 1. If the grinding is not done properly, positioning interference and clamping interference will occur during the clamping process, which will directly lead to scrap in the subsequent turning process.
[0004] In summary, the transverse burrs in the sand cores of the past directly caused transverse flash to form on the casting during casting. Since the transverse flash blocked the front end of the central hole, it could only be ground down, which was difficult. As a result, the central hole, as the reference hole, could not be installed properly, ultimately resulting in defective volutes. 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 sand core and volute casting to solve the technical problem that transverse flash is generated on the volute casting produced by the sand core in the past, which makes it inconvenient to grind the flash and thus affects subsequent clamping interference.
[0006] The technical solution adopted by this utility model to solve its technical problem is:
[0007] Firstly, a sand core is provided, comprising an outer shell core and a flow channel core; the flow channel core includes an inner core body, an outer core body, and a core head, wherein the outer diameter of the inner core body and the outer core body are the same and their outer walls are smoothly transitioned, and the core head is connected to the outer core body; the outer core body and the core head are inserted into the outer shell core to assemble the flow channel core and the outer shell core together; a vertical slit is formed between the outer core body and the outer shell core, and a casting cavity is formed between the inner core body and the outer shell core, the casting cavity being connected to the vertical slit.
[0008] Furthermore, the core head is provided with multiple stepped openings.
[0009] Furthermore, the outer shell core includes an upper shell core and a lower shell core, which are spliced together to form the outer shell core.
[0010] The second aspect is to provide a casting made using the above-mentioned sand core casting, including a casting body, wherein the front end of the central hole of the casting body is provided with a vertical flash.
[0011] The beneficial effects of this utility model are:
[0012] In the sand core of this invention, a vertical burr is directly formed between the flow channel core and the outer shell core, avoiding the generation of horizontal burrs and preventing the formation of horizontal flash on the cast volute.
[0013] The volute casting of this utility model has a vertical flash formed on the outside of the central hole. The vertical flash can be quickly removed by cutting. Compared with the previous method of grinding to remove the horizontal flash, cutting is a simpler way to remove the vertical flash, which greatly improves the efficiency of flash removal on the volute casting. 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 volute casting; Figure 2 This is a schematic diagram of a traditional sand core. Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the flow channel core inside the volute casting; Figure 5 This is a schematic diagram of a traditional flow channel core; Figure 6 This is a schematic diagram of the sand core in this embodiment; Figure 7 yes Figure 6Enlarged view at point B in the middle; Figure 8 This is a schematic diagram of the improved flow channel core inside the volute casting; Figure 9 This is a schematic diagram of the improved flow channel core; where 1 is the volute casting, 11 is the central hole, 21 is the transverse burr, 22 is the vertical burr, 3 is the flow channel core, 31 is the inner core, 311 is the front end face, 32 is the outer core, 33 is the core head, 331 is the stepped opening, and 4 is the outer core. 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 sand core, 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 transverse flash forms on the volute casting 1 produced by sand core casting, making flash grinding difficult and thus affecting subsequent clamping interference, an embodiment of this application provides a sand core. This is described in detail below. Figures 6 to 9 As shown, a sand core includes an outer shell core 4 and a flow channel core 3; as Figure 9 As shown, the flow channel core 3 includes an inner core 31, an outer core 32, and a core head 33. The outer diameters of the inner core 31 and the outer core 32 are the same, and their outer walls are smoothly transitioned. The core head 33 is connected to the outer core 32. The outer core 32 and the core head 33 are inserted into the outer shell core 4 so that the flow channel core 3 and the outer shell core 4 are assembled together. A vertical slit 22 is formed between the outer core 32 and the outer shell core 4, and a casting cavity is formed between the inner core 31 and the outer shell core 4. The casting cavity is connected to the vertical slit 22.
[0019] Specifically, as an optional implementation method in this embodiment, such as Figure 9 As shown, the core head 33 is provided with multiple stepped openings 331.
[0020] The core head 33 is connected to the outer shell core 4 by various stepped openings 331 to facilitate stable assembly.
[0021] Specifically, as an optional implementation method in this embodiment, such as Figure 6 As shown, the outer shell core 4 includes an upper shell core and a lower shell core, which are spliced together to form the outer shell core 4.
[0022] like Figure 8 As shown, the flow channel core 3 is assembled with the cast volute casting 1, through... Figure 8 It can be seen that the outer core 32 extends out from the central hole 11 of the volute casting 1 and is inserted into the outer core 4, thus forming a vertical burr 22. The molten iron entering the vertical burr 22 forms a vertical flash when it cools. After the flow channel core 3 is removed, the vertical flash protrudes from the end face of the volute casting 1.
[0023] like Figure 7 As shown, the position of the volute casting 1 is the position of the casting cavity. The front end of the casting cavity is connected to the vertical burr 22. The molten iron in the casting cavity enters the vertical burr 22 and finally forms the vertical flash.
[0024] like Figure 9 The flow channel core 3 shown corresponds to the shape of the inner hole of the volute. Both the inner core 31 and the outer core 32 are cylinders with the same outer diameter, thus avoiding the formation of transverse burrs.
[0025] This application provides a volute casting 1 cast using the above-mentioned sand core casting, including a casting body, wherein the front end of the central hole 11 of the casting body is provided with a vertical flash.
[0026] Compared to the previous horizontal burrs, vertical burrs are easier to remove. Since vertical burrs protrude from the end face, they can be directly cut off by a cutting machine, resulting in very high removal efficiency. In contrast, the previous horizontal burrs were blocked at the front end of the central hole 11, requiring a grinder to be inserted into the central hole 11 and then slowly ground radially until flat, resulting in very low removal efficiency.
[0027] After removing the vertical flash from the volute casting 1, it can be installed on the lathe. During installation, the central hole 11 is used as a reference hole to mate with the chuck on the lathe.
[0028] 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.
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] 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 sand core, characterized in that, The system includes an outer shell core (4) and a flow channel core (3). The flow channel core (3) includes an inner core (31), an outer core (32), and a core head (33). The outer diameters of the inner core (31) and the outer core (32) are the same, and their outer walls are smoothly transitioned. The core head (33) is connected to the outer core (32). The outer core (32) and the core head (33) are inserted into the outer shell core (4) so that the flow channel core (3) and the outer shell core (4) are assembled together. A vertical slit is formed between the outer core (32) and the outer shell core (4), and a casting cavity is formed between the inner core (31) and the outer shell core (4). The casting cavity is connected to the vertical slit.
2. The sand core according to claim 1, characterized in that, The core head (33) is provided with multiple stepped openings (331).
3. The sand core according to claim 1, characterized in that, The outer shell core (4) includes an upper shell core and a lower shell core, which are spliced together to form the outer shell core (4).
4. A volute casting made using sand core casting as described in any one of claims 1-3, characterized in that, It includes a casting body, and the front end of the central hole (11) of the casting body is provided with a vertical flash.