A foundry mould sand core positioning support structure

Abstract

This application relates to the field of sand core mold technology, and in particular to a sand core positioning and support structure for casting molds. The structure includes an upper mold, a lower mold, and a casting sand core. Both the upper and lower molds share a pouring cavity. The upper mold has a pouring port communicating with the pouring cavity. Both the upper and lower molds have core-holding grooves for placing the casting sand core. The casting sand core includes an inner sand core and an outer sand core. Multiple support pillars are arranged between the inner and outer sand cores, with each support pillar corresponding to a connecting hole. The inner sand core forms a flow channel, and the support pillars form the connecting holes. The inner sand core includes a sand core seat, a connecting rod, short sand cores, and long sand cores. The short sand cores are integrally formed on the sand core seat via connecting rods, and the long sand cores are integrally formed on the sand core seat via connecting rods. The connecting rods form a hole at one end of the shell that communicates with the flow channel. This application has the effect of improving the casting yield of complex workpieces.

Description

Technical Field

[0001] This application relates to the field of sand core mold technology, and in particular to a sand core positioning support structure for casting molds. Background Technology

[0002] Sand casting is a casting method that produces castings in sand molds. Steel, iron, and most non-ferrous alloy castings can be obtained using sand casting. Because the molding materials used in sand casting are inexpensive and readily available, and the mold making is simple, it is suitable for single-piece production, batch production, and mass production of castings, and has long been a basic process in casting production.

[0003] The related technology discloses a cast tube shell component, with reference to Figure 1 The device includes a housing 01, the housing 01 having a C-shaped cross-section, and two complex flow channels 02 of different lengths opening into one end of the C-shape of the housing 01. The outer wall of the housing 01 has multiple connecting holes 03 that communicate with the flow channels 02.

[0004] Currently, the traditional casting method involves casting the shell and runners on the shell as a single piece using a sand core and mold, and then machining the connecting holes later. However, in the actual casting process, the molten metal often deflects the sand core, resulting in a significant error in the position of the drilled connecting holes and the connection points between the runners during the later drilling process after the shell has cooled. This leads to a decrease in the pass rate of the workpiece and presents certain shortcomings. Utility Model Content

[0005] In order to improve the problem of decreased workpiece yield caused by traditional casting methods, this application provides a sand core positioning support structure for casting molds.

[0006] The technical solution for a casting mold sand core positioning support structure provided in this application is as follows: A casting mold sand core positioning support structure includes an upper mold, a lower mold, and a casting sand core. The upper mold and the lower mold share a pouring cavity. The upper mold has a pouring port communicating with the pouring cavity. Both the upper mold and the lower mold have core-holding grooves for placing the casting sand core. The casting sand core includes an inner sand core and an outer sand core. Multiple support columns are arranged between the inner sand core and the outer sand core. Each support column corresponds to a connecting hole. The inner sand core is used to form a flow channel, and the support columns are used to form connecting holes.

[0007] By adopting the above technical solution, the outer sand core is integrated with the inner sand core through multiple support columns. When the upper mold is closed with the lower mold, the molten metal enters the casting cavity through the casting port. Since the outer sand core improves the structural strength of the inner sand core through the support columns, the possibility of the inner sand core shifting during the metal casting process is reduced. After the molten metal cools and forms a shell, the inner sand core forms a flow channel inside the shell, and the support columns form connecting holes that communicate with the flow channel. The sand core can then be cleaned. This not only reduces the difficulty of traditional drilling but also improves the overall quality of the workpiece.

[0008] Optionally, the inner sand core includes a sand core seat, a connecting rod, a short sand core, and a long sand core. The short sand core is integrally formed on the sand core seat via the connecting rod, and the long sand core is integrally formed on the sand core seat via the connecting rod. The connecting rod is used to form a hole that connects one end of the shell to the flow channel.

[0009] By adopting the above technical solution, the integrated molding method of each component on the inner sand core greatly reduces the difficulty and cost of production, which is conducive to the needs of mass production.

[0010] Optionally, the support columns are arranged on both the short sand core and the long sand core, and the outer sand core is provided with a plurality of connecting slots for the support columns to be inserted into, and the connecting slots correspond one-to-one with the support columns.

[0011] By adopting the above technical solution, it is beneficial to maintain the stability of the positional relationship between the inner and outer sand cores, and to improve the yield of the cast shell.

[0012] Optionally, the support column and the connecting groove of the outer sand core are fixed together by ceramic adhesive.

[0013] By adopting the above technical solution, the worker first applies ceramic adhesive to the connecting groove on the outer sand core, and then inserts the support column on the cured inner sand core into the connecting groove on the outer sand core. When the ceramic adhesive is cured, the outer sand core and the inner sand core form a whole. When pouring molten metal, the possibility of the inner sand core shifting can be greatly reduced.

[0014] Optionally, the inner wall of the casting cavity of the upper mold is provided with an external groove for accommodating the external sand core.

[0015] By adopting the above technical solution, the impact of the outer sand core on the shell formed after cooling during the casting process is reduced, which helps to reduce the formation of redundant structures on the shell after casting.

[0016] Optionally, a drain groove is provided on the inner wall of the casting cavity of the lower mold.

[0017] By adopting the above technical solution, during the casting process, excess molten metal will flow into the discharge tank, which helps to improve the casting quality of the shell.

[0018] Optionally, the upper mold has an integrally formed boss, and the lower mold has a groove for the boss to be inserted into.

[0019] By adopting the above technical solution, when the boss on the upper mold matches the groove on the lower mold, the possibility of misalignment between the upper and lower molds is reduced, thereby reducing the possibility of damage to the sand core.

[0020] Optionally, the lower mold is provided with several heat dissipation grooves.

[0021] By adopting the above technical solution, it is beneficial to shorten the cooling and solidification time of the molten metal after pouring.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The outer sand core is integrated with the inner sand core through multiple support columns. When the upper mold is closed with the lower mold, the molten metal enters the casting cavity through the pouring port. Since the outer sand core improves the structural strength of the inner sand core through the support columns, the possibility of the inner sand core shifting during the metal pouring process is reduced. After the poured molten metal cools and forms a shell, the inner sand core forms a flow channel inside the shell, and the support columns form connecting holes that communicate with the flow channel. The sand core can then be cleaned. This not only reduces the difficulty of traditional drilling but also improves the overall quality of the workpiece. 2. The worker first applies ceramic adhesive to the connecting groove on the outer sand core. Then, the support column on the cured inner sand core is inserted into the connecting groove on the outer sand core. After the ceramic adhesive cures, the outer sand core and the inner sand core form a whole. When molten metal is poured, the possibility of the inner sand core shifting is greatly reduced. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of a cast tube shell component in the background art.

[0024] Figure 2 This is a structural schematic diagram of an embodiment of this application.

[0025] Figure 3 This is a structural schematic diagram used in the embodiments of this application to illustrate the positional relationship between the inner sand core, the lower mold, and the outer sand core.

[0026] Figure 4 This is a cross-sectional view used in the embodiments of this application to illustrate the positional relationship between the upper mold, lower mold, and casting sand core.

[0027] Figure 5 This is an exploded schematic diagram used in the embodiments of this application to illustrate the inner sand core, outer sand core and support column.

[0028] Explanation of reference numerals in the attached drawings: 01, shell; 02, flow channel; 03, connecting hole; 1, upper mold; 2, lower mold; 3, casting sand core; 31, inner sand core; 311, sand core seat; 312, connecting rod; 313, short sand core; 314, long sand core; 32, outer sand core; 33, support column; 4, pouring cavity; 5, pouring port; 6, core placement groove; 7, connecting groove; 8, outer placement groove; 9, discharge groove; 10, boss; 11, groove; 12, heat dissipation groove. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 2-5 This application will be described in further detail.

[0030] This application discloses a sand core positioning support structure for casting molds.

[0031] Reference Figure 2 , Figure 3 and Figure 4 A casting mold sand core positioning support structure includes an upper mold 1, a lower mold 2 and a casting sand core 3. The upper mold 1 and the lower mold 2 are provided with a pouring cavity 4. The upper mold 1 is provided with a pouring port 5 that communicates with the pouring cavity 4. The upper mold 1 and the lower mold 2 are both provided with a core placement groove 6 for placing the casting sand core 3.

[0032] Reference Figure 3 and Figure 5 The casting sand core 3 includes an inner sand core 31 and an outer sand core 32. The inner side wall of the casting cavity 4 of the upper mold 1 is provided with an outer groove 8 for accommodating the outer sand core 32. Multiple support columns 33 are arranged between the inner sand core 31 and the outer sand core 32. The support columns 33 correspond one-to-one with the connecting holes 03. The inner sand core 31 is used to form the flow channel 02, and the support columns 33 are used to form the connecting holes 03.

[0033] Reference Figure 5 The inner sand core 31 includes a sand core seat 311, a connecting rod 312, a short sand core 313, and a long sand core 314. The short sand core 313 is integrally formed on the sand core seat 311 through the connecting rod 312, and the long sand core 314 is integrally formed on the sand core seat 311 through the connecting rod 312. The connecting rod 312 is used to form a hole that connects the C-shaped end of the shell 01 to the flow channel 02.

[0034] Reference Figure 5 Both the short sand core 313 and the long sand core 314 are integrally formed with support columns 33. The outer sand core 32 has multiple connecting slots 7 for the support columns 33 to be inserted into. The connecting slots 7 correspond one-to-one with the support columns 33. The support columns 33 and the connecting slots 7 of the outer sand core 32 are bonded and fixed together with ceramic adhesive.

[0035] Reference Figure 3 and Figure 4The lower mold 2 has a discharge groove 9 on the inner side wall of the casting cavity 4. The upper mold 1 has a boss 10 integrally formed on it. The lower mold 2 has a groove 11 for the boss 10 to be inserted into. The lower mold 2 has several heat dissipation grooves 12. The upper mold 1 is fixed to the lower mold 2 by bolts and nuts.

[0036] Workers first create inner sand core 31 and outer sand core 32 using a special sand core mold. Then, they heat and cure the inner sand core 31 and outer sand core 32. Subsequently, they apply ceramic adhesive to the connecting groove 7 and the support column 33. Then, they insert the support column 33 on the inner sand core 31 into the connecting groove 7 on the outer sand core 32. After the ceramic adhesive cures, the outer sand core 32 and the inner sand core 31 form a whole.

[0037] The worker places the integral casting sand core 3 on the core placement groove 6 on the lower mold 2. As the upper mold 1 closes to the lower mold 2, until the boss 10 on the upper mold 1 is inserted into the groove 11 on the lower mold 2, the outer sand core 32 is located in the outer placement groove 8 of the upper mold 1. Therefore, the upper mold 1 achieves the function of fixing the outer sand core 32 and the inner sand core 31 through the outer placement groove 8.

[0038] Afterwards, the workers fix the upper mold 1 to the lower mold 2 with bolts and nuts. Finally, the workers pour the molten metal into the pouring cavity 4 through the pouring port 5. After the poured molten metal cools and solidifies, the inner sand core 31 forms two flow channels 02 in the shell 01, and the support column 33 forms a connecting hole 03 on the shell 01 that communicates with the flow channels 02, thus completing the casting process of the workpiece.

[0039] The implementation principle of a casting mold sand core positioning support structure in this application embodiment is as follows: the worker first makes an inner sand core 31 and an outer sand core 32 using a special sand core mold. Then, the inner sand core 31 and the outer sand core 32 are heated and cured. Subsequently, ceramic adhesive is applied to the connecting groove 7 and the support column 33. Then, the support column 33 on the inner sand core 31 is inserted into the connecting groove 7 on the outer sand core 32. After the ceramic adhesive is cured, the outer sand core 32 and the inner sand core 31 form a whole.

[0040] The worker places the integral casting sand core 3 on the core placement groove 6 on the lower mold 2. As the upper mold 1 closes to the lower mold 2, until the boss 10 on the upper mold 1 is inserted into the groove 11 on the lower mold 2, the outer sand core 32 is located in the outer placement groove 8 of the upper mold 1. Therefore, the upper mold 1 achieves the function of fixing the outer sand core 32 and the inner sand core 31 through the outer placement groove 8.

[0041] Afterwards, the workers fix the upper mold 1 to the lower mold 2 with bolts and nuts. Finally, the workers pour the molten metal into the pouring cavity 4 through the pouring port 5. After the poured molten metal cools and solidifies, the inner sand core 31 forms two flow channels 02 in the shell 01, and the support column 33 forms a connecting hole 03 on the shell 01 that communicates with the flow channels 02, thus completing the casting process of the workpiece.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A foundry mold sand core positioning support structure, characterized by: The system includes an upper mold (1), a lower mold (2), and a casting sand core (3). The upper mold (1) and the lower mold (2) are provided with a casting cavity (4). The upper mold (1) is provided with a casting port (5) that communicates with the casting cavity (4). The upper mold (1) and the lower mold (2) are provided with a core-holding groove (6) for placing the casting sand core (3). The casting sand core (3) includes an inner sand core (31) and an outer sand core (32). Multiple support columns (33) are provided between the inner sand core (31) and the outer sand core (32). The support columns (33) correspond one-to-one with the connecting holes (03). The inner sand core (31) is used to form a flow channel (02), and the support columns (33) are used to form the connecting holes (03).

2. A foundry mould sand core positioning support structure according to claim 1, characterised in that: The inner sand core (31) includes a sand core seat (311), a connecting rod (312), a short sand core (313), and a long sand core (314). The short sand core (313) is integrally formed on the sand core seat (311) through the connecting rod (312), and the long sand core (314) is integrally formed on the sand core seat (311) through the connecting rod (312). The connecting rod (312) is used to form a hole that connects one end of the shell (01) in a C shape to the flow channel (02).

3. A foundry mould sand core positioning support structure according to claim 2, characterised in that: The short sand core (313) and the long sand core (314) are both provided with the support column (33), and the outer sand core (32) is provided with a plurality of connecting grooves (7) for the support column (33) to be inserted into, and the connecting grooves (7) correspond one-to-one with the support column (33).

4. A foundry mould sand core positioning support structure according to claim 3, characterised in that: The support column (33) and the connecting groove (7) of the outer sand core (32) are fixed together by ceramic adhesive.

5. A foundry mold sand core positioning support structure according to claim 1, characterized in that: An outer groove (8) for accommodating the outer sand core (32) is provided on the inner wall of the casting cavity (4) of the upper mold (1).

6. A foundry mold sand core positioning support structure according to claim 1, characterized in that: The lower mold (2) has a discharge groove (9) on the inner wall of the casting cavity (4).

7. A foundry mold sand core positioning support structure according to claim 1, characterized in that: The upper mold (1) has a boss (10) integrally formed on it, and the lower mold (2) has a groove (11) for the boss (10) to be inserted into.

8. A foundry mold sand core positioning support structure according to claim 1, characterized in that: The lower mold (2) is provided with several heat dissipation grooves (12).

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