Investment mold pressing based on ceramic core investment casting heat storage block
By combining ceramic core investment casting technology with low-temperature mold material, the problem of forming through holes in small-sized heat storage blocks was solved, and the preparation of high-strength ceramic cores was achieved, ensuring the success and quality of investment casting.
Patent Information
- Application Number
- CN202423274593.9
- 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 technology is insufficient to effectively form 15 small-sized through holes in the heat storage block, leading to failure of investment casting.
The ceramic core investment casting process is adopted, using low-temperature mold material and silicon-based large-planar thin-walled high-strength ceramic core, combined with paraffin and stearic acid low-temperature mold material, and heat storage blocks are prepared by investment molding to ensure that the ceramic core does not deform or crack.
This method successfully produced qualified heat storage block blanks while meeting the requirements of investment casting, avoiding deformation and cracking of the ceramic core and improving production efficiency.
Smart Images
Figure CN223833380U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of investment casting precision casting, specifically relating to an investment casting mold based on a ceramic core investment casting heat storage block. Background Technology
[0002] like Figure 1 The image shown is a front view of the heat storage block 1 in the prior art; as shown... Figure 2 The image shown is a left view of the heat storage block 1 in the prior art.
[0003] The heat storage block 1 of the investment casting has multiple heat storage block through holes 11, with dimensions of 146*146*206mm (length, width, and height). The outer frame wall thickness is 8.5-9mm, the internal partition thickness is 6±0.3mm, and there are a total of 15 heat storage block through holes 11, each with a width of 128mm and a thickness of 3±0.5mm. The 15 small-sized heat storage block through holes 11 cannot be directly formed using investment casting, which is a technical problem that urgently needs to be solved. Utility Model Content
[0004] The purpose of this invention is to provide a casting mold for heat storage blocks based on ceramic cores, which enables the preparation of heat storage block casting molds using low-temperature molding materials and silicon-based large-plane thin-walled high-strength ceramic cores, ensuring that the ceramic cores do not deform or crack.
[0005] The technical solution is as follows:
[0006] The investment casting mold for a ceramic core-based heat storage block includes: an investment casting mold and a core. The core is made of ceramic material. The investment casting 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, and the outer sleeve is a rectangular cylindrical structure. The outer sleeve is located on top of the base plate. The right mold, left mold, top mold, front mold, and rear mold are installed inside the outer sleeve. The right mold and left mold are located on the right and left sides, respectively. The front mold and rear mold are located at the front and rear, respectively. The top mold is located on top of the right mold, left mold, front mold, and rear mold. The right mold has multiple right through slots, the left mold has multiple left through slots, and the left side of the outer sleeve has multiple outer sleeve through slots. The top mold has a wax injection port in the middle. Multiple cores are respectively inserted into the outer sleeve through slots, left through slots, and right through slots.
[0007] Furthermore, the core includes: a positioning core head, a core body, and a supporting core head. The positioning core head and the supporting core head are respectively located on the left and right sides of the core body. The core body and the supporting core head have the same thickness, but the thickness of the positioning core head is greater than the thickness of the core body and the supporting core head.
[0008] Furthermore, the core has a sheet-like structure.
[0009] Furthermore, the positioning core tip is provided with a core tip through hole.
[0010] Furthermore, the core body and the supporting core head are 3mm thick and 131.2mm wide, with a total length of 216mm; the positioning core head is 9mm thick, 108mm wide, and 10mm long.
[0011] This utility model has the following advantages compared with the prior art:
[0012] This invention enables the preparation of heat storage block investment casting molds using low-temperature molding materials and silicon-based large-planar thin-walled high-strength ceramic cores. Under the premise of meeting the investment casting process, it ensures that the ceramic core does not deform or crack, thereby finally obtaining a qualified heat storage block blank. Attached Figure Description
[0013] Figure 1 This is a front view of a heat storage block in the prior art;
[0014] Figure 2 This is a left view of a heat storage block in the prior art;
[0015] Figure 3 This is a schematic diagram of the investment molding structure of the heat storage block based on ceramic core investment casting in this utility model;
[0016] Figure 4 yes Figure 3 Top view;
[0017] Figure 5 This is a schematic diagram of the structure of the core in this utility model;
[0018] Figure 6 This is a top view of the core of this utility model. Detailed Implementation
[0019] The following description fully illustrates specific embodiments of the present invention to enable those skilled in the art to practice and reproduce it.
[0020] like Figure 3 The diagram shown is a schematic representation of the investment molding structure of the ceramic core investment casting heat storage block in this invention; as shown... Figure 4 As shown, is Figure 3 Top view.
[0021] The investment molding die for a ceramic core-based investment casting heat storage block includes: an investment molding die 1 and a core 2. The investment molding die 1 includes: a base plate 11, an outer sleeve 12, a right mold 13, a left mold 14, a top mold 15, a front mold 16, and a rear mold 17. The base plate 11 is rectangular, and the outer sleeve 12 is a rectangular cylindrical structure. The outer sleeve 12 is located on top of the base plate 11. The right mold 13, left mold 14, top mold 15, front mold 16, and rear mold 17 are installed inside the outer sleeve 12. Mold 14 is located on the right and left sides respectively, front mold 16 and rear mold 17 are located at the front and rear respectively, and top mold 15 is located on top of right mold 13, left mold 14, front mold 16 and rear mold 17; right mold 13 is provided with multiple right through slots, left mold 14 is provided with multiple left through slots, outer sleeve 12 is provided with multiple outer sleeve through slots on the left side, and top mold 15 is provided with wax injection port 17 in the middle; core 2 is a sheet structure, and multiple cores 2 are inserted into the outer sleeve through slots, left through slots and right through slots.
[0022] Cores #1 through #15 are sequentially passed through the outer sleeve groove, the left groove, and inserted into the right groove. Cores #1 through #15 are made of high-strength steel with HRc≥60, and the remaining forming structures are made of aluminum alloy with Rm≥200MPa.
[0023] like Figure 5 The diagram shown is a structural schematic of the core 2 in this utility model; as shown... Figure 6 The image shown is a top view of the core 2 in this utility model.
[0024] The core 2 is made of ceramic material and has a sheet structure, including: positioning core head 21, core body 22, and supporting core head 23. The positioning core head 21 and supporting core head 23 are respectively located on the left and right sides of the core body 22. The core body 22 and supporting core head 23 have the same thickness, and the thickness of the positioning core head 21 is greater than the thickness of the core body 22 and supporting core head 23.
[0025] The core body 22 and the supporting core head 23 are 3mm thick and 131.2mm wide, with a total length of 216mm. The positioning core head 21 is 9mm thick, 108mm wide, and 10mm long.
[0026] The positioning core 21 is provided with a core through hole 24 for easy insertion and removal.
[0027] The molding process uses a low-temperature molding compound of paraffin wax and stearic acid, with pressure controlled at 0.15-0.35 MPa, wax temperature at 58-60℃, and water cooling for 5 min ± 30 s at a water temperature of 25-30℃. Fifteen cores 2 are prepared, and the casting process is completed. Cores 2 #1 to #15 are taken out sequentially. For each core 2 taken out, one core 2 is inserted into the corresponding slot (left, right, or outer groove) until all 15 cores 2 are inserted. During trial production, cores 2 (silicon-based high-strength ceramic cores) are used to assist in the molding of the 15 through gaps in the heat storage block 1, meaning 15 silicon-based high-strength ceramic cores are pre-placed in each casting mold. The gaps between the positioning core head 21, the core body 22, and the supporting core head 23 are sealed with liquid wax at a temperature controlled at 70-75℃. The gaps between the positioning core heads 21 are also sealed with liquid wax at a temperature of 70-75℃. The exposed parts of the ceramic core positioning and supporting core heads are coated with a 0.5mm thick layer of wax liquid by brushing or spraying. After the entire process of investment casting, the base plate 11, outer sleeve 12, right mold 13, left mold 14, top mold 15, front mold 16, and rear mold 17 are removed. The investment mold is placed on a horizontal platform for natural cooling for more than 8 hours. During the natural cooling process, it is ensured that the large flat surface of the ceramic core is in a vertical position and does not directly contact the horizontal platform. Watermarks, shrinkage dents, etc. on the surface of the investment mold are manually repaired to meet the casting process design requirements. The investment mold is cleaned and the blank is obtained as a heat storage block.
[0028] 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 type of investment molding die for a ceramic core-based investment casting heat storage block, characterized in that, include: The process includes a casting mold and cores. The cores are made of ceramic material. The casting mold consists of 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, and the outer sleeve is a rectangular cylindrical structure. The outer sleeve is located on top of the base plate. The right mold, left mold, top mold, front mold, and rear mold are installed inside the outer sleeve. The right mold and left mold are located on the right and left sides, respectively. The front mold and rear mold are located at the front and rear, respectively. The top mold is located on top of the right mold, left mold, front mold, and rear mold. The right mold has multiple right through slots, the left mold has multiple left through slots, and the left side of the outer sleeve has multiple outer sleeve through slots. The top mold has a wax injection port in the middle. Multiple cores are respectively inserted into the outer sleeve through slots, left through slots, and right through slots.
2. The investment molding process for a ceramic core-based investment casting heat storage block as described in claim 1, characterized in that, The core includes: a positioning core head, a core body, and a supporting core head. The positioning core head and the supporting core head are respectively located on the left and right sides of the core body. The core body and the supporting core head have the same thickness, but the thickness of the positioning core head is greater than the thickness of the core body and the supporting core head.
3. The investment molding process for a ceramic core-based investment casting heat storage block as described in claim 1, characterized in that, The core has a sheet-like structure.
4. The investment molding process for a ceramic core-based investment casting heat storage block as described in claim 2, characterized in that, The positioning core head is equipped with a core head through hole.
5. The investment molding process for a ceramic core-based investment casting heat storage block as described in claim 2, characterized in that, The core body and supporting core head are 3mm thick and 131.2mm wide, with a total length of 216mm. The positioning core head is 9mm thick, 108mm wide, and 10mm long.