Mold core supporting structure for investment casting heat storage block
By connecting multiple core pieces into an integral structure and using a wax injection molding machine, the problems of fracture and deformation of heat storage block cores in investment casting during the molding process are solved, thereby improving the strength of the cores and achieving high-quality molding of the castings.
Patent Information
- Application Number
- CN202423274654.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing investment casting heat storage block cores are prone to deformation and breakage during the molding process, resulting in a high scrap rate of castings, and the coating method cannot be directly used to make shells.
The core is made of multiple core pieces connected into an integral structure. The core strength is enhanced by a core support structure, and the core is injection molded using a wax injection machine to ensure that the core does not break or deform.
This technology enhances the strength of the core, prevents breakage and deformation, ensures the molding quality of the casting, and is suitable for single-piece and small-batch production.
Smart Images
Figure CN223833375U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of investment casting precision casting, specifically relating to a core support structure for investment casting heat storage blocks. Background Technology
[0002] like Figure 1 The diagram shown is a schematic diagram of the structure of a heat storage block for investment casting in the prior art.
[0003] The overall structure of the heat storage block for investment casting is a grid type, with a length, width and height of 146*146*206mm, an outer frame wall thickness of 8.5-9mm, an internal partition thickness of 6±0.3mm, and a through gap thickness of 3±0.5mm.
[0004] For the heat storage block structure of this investment casting, if the investment casting process is used, the 206mm deep, 3±0.5mm thick through-hole cannot be directly formed using the coating method; a core is required. Considering the post-casting cleaning operation, an easy-to-clean core is used. However, this core has low strength and is a thin-walled, large flat plate structure, making it extremely prone to deformation and breakage during the molding process, resulting in a scrap casting. Utility Model Content
[0005] The purpose of this utility model is to provide a core support structure for investment casting heat storage blocks. By connecting multiple core pieces into an integral structure, the strength of the core is enhanced, enabling the heat storage block to be injection molded using a wax injection machine, ensuring that the core does not break and that the deformation is controlled to a minimum.
[0006] The technical solution is as follows:
[0007] The core support structure for investment casting heat storage blocks includes: a core support structure and a mold. The core support structure is installed inside the mold. The core support structure includes: a core and core supports. The core supports have support arms on both sides and core support feet at the bottom. Multiple rectangular core support insertion holes are arranged longitudinally in the middle. The multiple core supports are arranged laterally, and the core passes through the core support insertion holes. The mold includes: a base plate, an outer sleeve, a right mold, a left mold, a top mold, a front mold, and a rear mold. The base plate is rectangular in shape, and the outer sleeve is a rectangular cylindrical structure. The outer sleeve is set on top of the base plate. The right mold and left mold are set inside the outer sleeve and are located on the right and left sides, respectively. Multiple longitudinal slots are set on the side walls of the right mold and left mold. The slots of the right mold and left mold are positioned opposite each other, and the support arms are inserted into the slots. The front mold and rear mold are set inside the outer sleeve and are located at the front and rear, respectively. The top mold is rectangular and is set on top of the right mold, left mold, front mold, and rear mold. A wax injection port is set in the middle of the top mold.
[0008] Furthermore, the top and bottom of the jacket are open, and the core support feet are located on the base plate.
[0009] Furthermore, multiple core supports are parallel to each other, and multiple cores are parallel to each other.
[0010] Furthermore, the right mold, left mold, front mold, and rear mold are all the same height.
[0011] This utility model has the following advantages compared with the prior art:
[0012] This invention strengthens the core by connecting multiple core pieces into an integral structure, enabling the injection molding of heat storage block molds using a wax injection machine, ensuring that the core does not break and that the deformation is controlled to a minimum.
[0013] Based on the provided technical solution, single-piece and small-batch production was carried out. After verification of the casting process and casting, the technical solution of this utility model is reasonable and feasible, providing sufficient support for the core and ensuring that the core has sufficient resistance to deformation, thus solving the problem of core deformation and breakage during the molding process. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of a heat storage block in an investment casting.
[0015] Figure 2 This is a schematic diagram of the core support structure for the investment casting heat storage block in this utility model;
[0016] Figure 3 This is a structural schematic diagram of the core support structure in this utility model;
[0017] Figure 4 This is a schematic diagram of the structure of the core in this utility model;
[0018] Figure 5 This is a schematic diagram of the core support structure of this utility model;
[0019] Figure 6 This is a schematic diagram of the mold structure in this utility model;
[0020] Figure 7 This is a schematic diagram of the internal structure of the top mold in this utility model. Detailed Implementation
[0021] The following description fully illustrates specific embodiments of the present invention to enable those skilled in the art to practice and reproduce it.
[0022] like Figure 2 The diagram shown is a schematic diagram of the core support structure for the investment casting heat storage block in this utility model.
[0023] The core support structure for investment casting heat storage blocks includes: a core support structure 1 and a mold 2, wherein the core support structure 1 is installed inside the mold 2.
[0024] like Figure 3The diagram shown is a structural schematic of the core support structure 1 in this utility model; as shown... Figure 4 The diagram shown is a structural schematic of the core 11 in this utility model; as shown... Figure 5 The diagram shown is a structural schematic of the core support 12 in this utility model.
[0025] The core support structure 1 includes a core 11 and a core support 12. The core support 12 has support arms 13 on both sides, a core support foot 14 at the bottom, and multiple rectangular core support insertion holes 15 arranged longitudinally in the middle. The multiple core supports 12 are arranged laterally, and the core 11 passes through the core support insertion holes 15.
[0026] Multiple core supports 12 are parallel to each other, and multiple cores 11 are parallel to each other.
[0027] Based on the dimensions of the through gap in the casting blank, the investment casting process, and the material properties, the structure of the core 11 is designed. The core 11 is a large flat plate structure with a total length of 221mm, a thickness of 3mm, and a width of 131.2mm. The four edges along the length of the core 11 are designed with rounded corners R1.
[0028] The core support 12 is made of 0.6mm thick stainless steel plate of the same grade as the casting. It is 131.8mm long and 3.35mm wide, with a total of 15 core support insertion holes 15, which are used to insert the core 11.
[0029] The support arm 13 has the same dimensions as the inner cavity of the molded die and contacts the side of the die. The core support foot 14 contacts the bottom plane of the molded die.
[0030] like Figure 6 The diagram shown is a structural schematic of mold 2 in this utility model; as shown... Figure 7 The diagram shown is a schematic diagram of the internal structure of mold 2 in this utility model.
[0031] Mold 2 includes: base plate 21, outer sleeve 22, right mold 23, left mold 24, top mold 25, front mold 26, and rear mold 27. The base plate 21 is rectangular in shape. The outer sleeve 22 has openings at the top and bottom and is a rectangular cylindrical structure. The outer sleeve 22 is located on top of the base plate 21. The right mold 23 and left mold 24 are located inside the outer sleeve 22 and are located on the right and left sides, respectively. The side walls of the right mold 23 and left mold 24 are provided with multiple slots 28 longitudinally, and the slots 28 of the right mold 23 and left mold 24 are positioned opposite each other. The front mold 26 and rear mold 27 are located inside the outer sleeve 22 and are located at the front and rear, respectively. The top mold 25 is rectangular and is located on top of the right mold 23, left mold 24, front mold 26, and rear mold 27. The top mold 25 has a wax injection port 29 in the middle.
[0032] The right mold 23, left mold 24, front mold 26 and rear mold 27 have the same height.
[0033] The material for mold 2 is aluminum alloy with Rm≥200MPa.
[0034] Fifteen core pieces 11 are inserted sequentially into the 3.3mm wide core support insertion holes 15 of the core support 12. Six core supports 12 are used, and the spacing between the core supports 12 is adjusted and controlled to be 35-40mm. They are symmetrically distributed along the center to form the core support structure 1. The mold 2 is assembled. The outer mold 22 is placed on the base plate 21. The right mold 23, left mold 24, front mold 26 and rear mold 27 are placed inside the outer mold 22 in sequence. The slots 28 of the right mold 23 and left mold 24 are positioned opposite each other. The core support structure 1 is placed in the space enclosed by the base plate 21, right mold 23, left mold 24, front mold 26 and rear mold 27. The core support feet 14 are located on the base plate 21. The support arms 13 on both sides of the core support 12 are inserted into the slots 28. Finally, the top mold 25 is placed on top of the right mold 23, left mold 24, front mold 26 and rear mold 27 and locked to form the core support structure for the heat storage block of investment casting.
[0035] A low-temperature wax injection machine is used to inject wax into the core support structure of the heat storage block through the wax injection port 29. The injection pressure is 0.15-0.35 MPa. The mold is pressurized and cooled for 25 minutes, and then air-cooled for more than 6 hours after demolding. This method ensures that the core 11 does not break and the deformation is controlled to a minimum when using a wax injection machine to mold the heat storage block.
[0036] The terminology used in this invention is descriptive and exemplary, and not restrictive. Since this invention can be embodied in various forms without departing from the spirit or essence of the technical solution, 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 core support structure for investment casting heat storage blocks, characterized in that, include: Core support structure and mold; the core support structure is installed inside the mold. The core support structure includes: a core and core supports. The core supports have support arms on both sides and core support feet at the bottom. Multiple rectangular core support insertion holes are arranged longitudinally in the middle. The multiple core supports are arranged laterally, and the core passes through the core support insertion holes. The mold includes: a base plate, an outer sleeve, a right mold, a left mold, a top mold, a front mold, and a rear mold. The base plate is rectangular in shape, and the outer sleeve is a rectangular cylindrical structure. The outer sleeve is set on top of the base plate. The right mold and left mold are set inside the outer sleeve and are located on the right and left sides, respectively. The side walls of the right mold and left mold have multiple longitudinal slots. The slots of the right mold and left mold are positioned opposite each other, and the support arms are inserted into the slots. The front mold and rear mold are set inside the outer sleeve and are located at the front and rear, respectively. The top mold is rectangular and is set on top of the right mold, left mold, front mold, and rear mold. A wax injection port is set in the middle of the top mold.
2. The core support structure for investment casting heat storage blocks as described in claim 1, characterized in that, The jacket has openings at the top and bottom, and the core support feet are located on the base plate.
3. The core support structure for investment casting heat storage blocks as described in claim 1, characterized in that, Multiple core supports are parallel to each other, and multiple cores are parallel to each other.
4. The core support structure for investment casting heat storage blocks as described in claim 1, characterized in that, The right mold, left mold, front mold, and rear mold are all the same height.