Foundry structure with exhaust core support

Abstract

The utility model discloses a casting structure with exhaust core bracing relates to cast iron metallurgy field, and this structure includes sand mould body, cavity area, the sand core of setting in sand mould body and the core bracing of embedding between sand mould body and sand core, and the upper fixed seat and lower fixed seat of sand mould body inside connection are arranged respectively to the upper and lower sides of core bracing, and the exhaust passage of through upper and lower sides is provided in the core bracing, and the inlet of exhaust passage and cavity area are provided with the isolation portion between. The casting structure with exhaust core bracing of the utility model can solve the use problem of no way to handle when placing core bracing fixed on the processing surface and having exhaust demand.

Description

Technical Field

[0001] This utility model relates to the field of cast iron metallurgy, specifically to a casting structure with an exhaust core support. Background Technology

[0002] A core support is a metal support that plays a supporting role in a casting mold. Its main function is to ensure the stability and correct position of the sand core during the casting process and to prevent the sand core from deforming or shifting under the action of high-temperature molten metal.

[0003] Current casting sand molds consist of upper and lower molds and a sand core, with the sand core assembled between the upper and lower molds. As molten iron is poured into the mold cavity, a large amount of moisture inside the sand core will vaporize. If the venting is not handled properly, the resulting castings will have quality defects such as porosity and blowouts. Utility Model Content

[0004] In order to solve the technical problems existing in the background art, the present invention adopts the following technical solution:

[0005] This utility model provides a casting structure with an exhaust core support, including a sand mold body, a cavity area, a sand core disposed in the sand mold body, and a core support embedded between the sand mold body and the sand core. The upper and lower sides of the core support are respectively provided with an upper fixing seat and a lower fixing seat connected to the inner side of the sand mold body. An exhaust channel is provided in the core support, which runs through the upper and lower sides. An isolation part is provided between the inlet of the exhaust channel and the cavity area.

[0006] The preferred technical solution of this utility model is that a first receiving groove matching the upper fixed seat is provided at the contact point between the sand mold body and the core support, and a second receiving groove matching the lower fixed seat is provided at the contact point between the sand core and the core support.

[0007] The preferred technical solution of this utility model is that the depth of the first receiving groove and the second receiving groove is 8-13mm.

[0008] The preferred technical solution of this utility model is that the isolation part is composed of clay strips.

[0009] The preferred technical solution of this utility model is that the diameter of the exhaust channel is 15-25mm.

[0010] The preferred technical solution of this utility model is that the upper fixed seat and the lower fixed seat have the same shape and size.

[0011] The preferred technical solution of this utility model is that the upper fixed seat and the lower fixed seat are cylindrical structures.

[0012] The preferred technical solution of this utility model is that the core supports are distributed in an array in the casting structure.

[0013] The preferred technical solution of this utility model is that a core head is provided at the bottom of the sand core.

[0014] The preferred technical solution of this utility model is that the core support is set at the processing surface, and the height of the core support is equal to the thickness of the body plus the thickness of the processing allowance.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This utility model proposes a casting structure with a venting core support. By embedding a specially made hollow core support between the sand mold body and the inner cavity sand core, and setting an upper fixed seat and a lower fixed seat on the upper and lower sides of the core support respectively, which are fastened to the inner side of the sand mold body, an innovative effect is achieved that can both stabilize the sand core and vent air, thus alleviating quality defects such as porosity and blowouts in the casting. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the casting structure of Embodiment 1 of this utility model;

[0019] Figure 2 This is an exploded view of the casting structure of Embodiment 1 of this utility model.

[0020] Figure 3 This is a top view of the casting structure of Embodiment 1 of this utility model;

[0021] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0022] Figure 5 for Figure 4 Enlarged view of part A in the image;

[0023] Figure 6 This is a perspective view of a partial sand core of Embodiment 1 of this utility model;

[0024] Figure 7 This is a perspective view of a partial core support according to Embodiment 1 of this utility model;

[0025] In the picture:

[0026] 1-Sand mold body; 11-Upper box; 111-Through hole; 12-Lower box; 13-First receiving groove; 2-Cavity area; 3-Sand core; 31-Second receiving groove; 32-Core head; 4-Core support; 41-Upper fixing seat; 42-Lower fixing seat; 43-Exhaust channel; 5-Cavity area; 6-Isolation part. Detailed Implementation

[0027] The present invention is further illustrated below with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Experimental methods in the following embodiments without specific conditions are generally performed under conventional conditions in the art or as recommended by the manufacturer; the raw materials and reagents used, unless otherwise specified, are all commercially available from the conventional market. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention are within the scope of protection claimed by the present invention.

[0028] Example 1

[0029] like Figure 1-7 As shown, this embodiment provides a casting structure with a venting core support, including a sand mold body 1, a cavity area 2, and a sand core 3 disposed within the sand mold body 1. The sand mold body 1 consists of an upper box 11 and a lower box 12, and a core support 4 embedded between the sand mold body 1 and the sand core 3. An upper fixing seat 41 and a lower fixing seat 42, respectively connected to the inner side of the sand mold body 1, are respectively provided on the upper and lower sides of the core support 4. A venting channel 43, penetrating both the upper and lower sides, is provided in the core support 4. An isolation part 6 is provided between the inlet of the venting channel 43 and the cavity area 2. The technical solution of this embodiment achieves an innovative effect of both stabilizing the sand core and venting air by embedding a specially designed hollow, penetrating core support between the sand mold body and the inner cavity sand core, and by providing upper and lower fixing seats, respectively, on the upper and lower sides of the core support, which are tightly connected to the inner side of the sand mold body. Specifically, the sand core is placed inside the sand mold body, serving to maintain the shape of the internal cavity during molding. The core support is embedded along the outer periphery of the sand core and connected to the inner wall of the sand mold body and the sand core via upper and lower fixing seats, respectively. The isolation section not only positions the core support but also provides a sealing barrier, further preventing molten casting from seeping into the venting channel inlet. More importantly, a through-hole venting channel 43 is formed inside the core support body. The upper end of the venting channel 43 connects to the through hole 111 of the upper box 11, while the lower end connects to the sand core 3. Thus, during the molten metal pouring process, the core support not only serves as a structural element for limiting and supporting the sand core but also guides the gas generated by the sand core 3 to the outside of the sand mold body through the through hole via the internal venting channel, significantly reducing the risk of porosity defects in the casting. This structure, by organically combining the fixing and stabilizing mechanism with the venting channel, ensures both stable positioning of the sand core and efficient venting, fully demonstrating the innovation and practicality of the design concept.

[0030] Preferably, a first receiving groove 13 matching the upper fixing seat 41 is provided at the contact point between the sand mold body 1 and the core support 4 to ensure a tight fit and connection. Specifically, the first receiving groove 13 is located inside the upper box 11, and a second receiving groove 31 matching the lower fixing seat 42 is provided at the contact point between the sand core 3 and the core support 4. This preferred solution enhances the positioning and structural stability of the upper and lower fixing seats from a structural perspective by providing a first receiving groove at the contact point between the sand mold body and the core support, and a second receiving groove at the contact point between the sand core and the core support. This is an important means to achieve stable fixing and lifting of the core support. Specifically, the first receiving groove matches the upper fixing seat, allowing the upper fixing seat to be accurately embedded during assembly and preventing assembly misalignment. The presence of the second receiving groove also provides a stable geometric constraint when the lower fixing seat is connected to the sand core, avoiding displacement and detachment caused by high-temperature thermal expansion or vibration. Especially in large or complex castings, sand cores are often heavy and have complex shapes, requiring higher mechanical stability of the fixing structure. This solution can maintain the stable support of the core support and sand core throughout the entire process before, during and after pouring, effectively improving casting accuracy and yield.

[0031] Preferably, the depths of the first receiving groove 13 and the second receiving groove 31 are 8-13 mm. This preferred embodiment optimizes and limits the depths of the first and second receiving grooves to within the range of 8-13 mm, based on a balance between strength, safety, and assembly efficiency. If the receiving grooves are too shallow, the insertion depth of the fixing seat may be insufficient, affecting its axial positioning and impact resistance, making it prone to shaking or even falling off during casting. Conversely, excessive groove depth not only increases the processing complexity of the sand mold and sand core, weakening their original structural strength, but also leads to a longer venting path and reduced venting efficiency. The 8-13 mm depth range, derived through structural testing and casting simulation analysis, provides sufficient positioning depth and support area to ensure the bonding strength between the fixing seat and the base, without causing unnecessary material waste or structural weakening. Especially in multi-core support structures, the consistency of the insertion depth of each core support significantly affects the overall support effect. This optimized depth also facilitates standardized processing molds and ensures consistency, thereby improving process stability. In this embodiment, the depths of the first receiving groove 13 and the second receiving groove 31 are 10 mm.

[0032] Preferably, the isolation section 6 is made of clay strips. For better sealing, clay strips are used as isolation sections between the inlet and cavity area of ​​the exhaust channel, and between the outlet and cavity area of ​​the exhaust channel. Using clay strips as the material for the isolation section is an economical, efficient, and practical preferred method. Clay strips possess good flexibility, plasticity, and adhesion, forming a tightly fitting sealing layer between the inlet and cavity area of ​​the exhaust channel, and between the outlet and cavity area of ​​the exhaust channel, preventing molten metal from seeping in or splashing during casting and causing defects. This solution also has strong on-site adaptability: the clay strips can be shaped and adjusted according to the shape of the cavity structure, ensuring good sealing performance under different mold geometry conditions. Furthermore, compared to complex metal structural parts or expensive sealants, the use of clay strips significantly reduces material costs and construction difficulty, and also facilitates demolding and secondary processing. Therefore, this solution balances functionality with manufacturing efficiency and economy, making it particularly suitable for the production of complex or large castings.

[0033] Preferably, the diameter of the exhaust channel 43 is 15-25mm. Setting the diameter of the exhaust channel in the core support to 15-25mm is based on a comprehensive consideration of gas volume emission efficiency and structural strength. Channels with a diameter less than 15mm are prone to blockage under high temperature and pressure environments, affecting exhaust flow; while channels larger than 25mm, although improving ventilation capacity, weaken the mechanical support capacity of the core support body. This solution selects a range of 15-25mm to ensure an optimal balance between ventilation effect and core support strength, satisfying the rapid discharge of large amounts of gas without compromising the structural safety of the core support supporting the sand core. At the same time, this size range is also compatible with most standard tools and exhaust devices used in the process, facilitating practical application and maintenance. In this embodiment, the diameter of the exhaust channel 43 is uniformly 20mm.

[0034] Preferably, the upper fixed seat 41 and the lower fixed seat 42 are identical in shape and size. This technical solution significantly improves manufacturing standardization and assembly convenience by designing the upper and lower fixed seats to have the same shape and dimensions. After standardization, this solution allows for shared molds and inventory during mass production and storage, reducing manufacturing and management costs. During assembly, there is no need to identify orientation and position; simply inserting the standardized fixed seat into the corresponding receiving slot completes positioning, effectively improving on-site operational efficiency. Furthermore, the standardized structure facilitates future maintenance and replacement, enhancing the sustainability of the entire casting process.

[0035] Preferably, the upper fixing seat 41 and the lower fixing seat 42 are cylindrical structures. Designing the upper and lower fixing seats as cylinders not only simplifies the structure and facilitates processing, but also provides greater uniformity under multi-directional load conditions. The cylindrical structure exhibits good mechanical symmetry in the casting environment, maintaining a stable support state under high-temperature expansion, vibration impact, and the weight of the sand core, making it less prone to skewing or localized stress concentration. Furthermore, the cylindrical fixing seats facilitate automatic guided engagement with the receiving holes on the surface of the sand mold and the sand core, exhibiting good self-centering properties and simplifying the core support insertion operation, making them particularly suitable for automated or semi-automated batch assembly.

[0036] Preferably, the core supports 4 are distributed in an array within the casting structure. This design, by distributing multiple core supports in an array within the casting structure, forms a uniformly distributed and mechanically balanced support network, thereby significantly enhancing the overall stability of the sand core. The array arrangement not only effectively disperses the gravity and impact forces on the sand core during pouring, reducing the risk of deformation or breakage caused by localized stress concentration, but also improves venting efficiency—the venting channels within the multiple core supports can form a parallel structure, rapidly guiding gas from different locations out and preventing stagnation. This distribution method is particularly suitable for large or structurally complex castings, allowing for targeted placement of core support nodes according to the cavity configuration, enhancing overall process flexibility and controllability.

[0037] Preferably, a core head 32 is provided at the bottom of the sand core 3. By adding a core head structure at the bottom of the sand core, the positioning stability and anti-floating performance of the sand core during the casting process are significantly improved, which is an effective optimization of the traditional sand core bottom structure. As a structural reinforcement component, the core head is inserted into the pre-made groove or positioning hole at the bottom of the sand mold during the actual assembly process, forming a mechanical fit with the bottom of the cavity. This fit provides a clear vertical positioning reference, preventing the sand core from floating or shifting due to its own weight or the buoyancy of the molten metal; on the other hand, it also provides a certain constraint on horizontal displacement, which is especially suitable for sand core structures with complex stress or high height. In addition, the core head can also serve as an independent load-bearing point, working together with the core support system to distribute the load of the sand core during the pouring process, reducing the stress on a single core support, and improving the safety and durability of the overall structure. Furthermore, an venting rope is pre-embedded in the sand core, which extends from the core head to the outside of the sand mold body. This preferred solution can further help to release the gas generated by the sand core and improve the quality of the casting.

[0038] Preferably, the core head 32 has a truncated cone structure that tapers from top to bottom. This top-to-bottom tapering truncated cone structure further optimizes the core head's geometry, balancing installation guidance, fitting stability, and ease of demolding. It is an ideal design choice for improving core head functionality and manufacturing efficiency. Because of its truncated cone shape (larger at the top and smaller at the bottom), the truncated cone core head can automatically guide and position itself when inserted into the mounting hole or groove. Even with minor manufacturing deviations in actual production, it can be smoothly inserted and self-corrected, avoiding misalignment of the core head with the bottom of the sand mold, which could lead to overall misalignment or installation difficulties. Simultaneously, this structure utilizes the taper to achieve a "wedge effect" under axial force, becoming increasingly secure under pressure. This effectively resists the buoyancy and impact loads generated during molten metal pouring, ensuring the sand core remains stable throughout the casting process.

[0039] Castings often have machined surfaces according to design requirements. Machined surfaces refer to the inner and outer surfaces of the casting after machining (turning, milling, drilling, grinding, etc.) to meet the requirements of the drawings. To facilitate machining, casting engineers add machining allowances (i.e., reserving extra material thickness for later cutting) to the existing machined surfaces to form the structure of the casting blank during casting. Conventionally, core supports are used on non-machined surfaces because poor fusion between the core support and the casting can create gaps; if placed on a machined surface, crack-like defects may appear. Preferably, the core support 4 is placed on the machined surface, and the height of the core support 4 is equal to the thickness of the body plus the thickness of the machining allowance. The thickness of the body here refers to the wall thickness of the casting at this location. When the blank casting is removed by cutting in the later stage, the upper fixed seat of the core support will be removed along with the machining allowance. The blank casting itself needs to be drilled in the venting channel of the core support, and the diameter of the drilled hole is larger than the diameter of the venting channel. The core support structure is set up as described above. The core support is set on the machining surface. The size of the core support is strictly controlled to meet the functions of support and venting while avoiding the core support residue on the machining surface, so as not to affect the normal use of the machining surface of the finished casting.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A casting structure with an exhaust core support, characterized in that: It includes a sand mold body (1), a cavity area (2), a sand core (3) disposed in the sand mold body (1), and a core support (4) embedded between the sand mold body (1) and the sand core (3); The upper and lower fixing seats (41) and the lower fixing seats (42) connected to the inner side of the sand mold body (1) are respectively provided on the upper and lower sides of the core support (4); The core support (4) is provided with an exhaust channel (43) that runs through the upper and lower sides, and an isolation part (6) is provided between the inlet of the exhaust channel (43) and the cavity area (2).

2. The casting structure according to claim 1, characterized in that: The contact point between the sand mold body (1) and the core support (4) is provided with a first receiving groove (13) that matches the upper fixed seat (41); The contact point between the sand core (3) and the core support (4) is provided with a second receiving groove (31) that matches the lower fixing seat (42).

3. The casting structure according to claim 2, characterized in that: The depth of the first receiving groove (13) and the second receiving groove (31) is 8-13 mm.

4. The casting structure according to claim 1, characterized in that: The isolation section (6) is made of clay strips.

5. The casting structure according to claim 1, characterized in that: The diameter of the exhaust passage (43) is 15-25 mm.

6. The casting structure according to claim 1, characterized in that: The upper fixing seat (41) and the lower fixing seat (42) are the same in shape and size.

7. The casting structure according to claim 6, characterized in that: The upper fixing seat (41) and the lower fixing seat (42) are cylindrical structures.

8. The casting structure according to claim 1, characterized in that: The core support (4) is distributed in an array in the casting structure.

9. The casting structure according to claim 1, characterized in that: The bottom of the sand core (3) is provided with a core head (32).

10. The casting structure according to claim 1, characterized in that: The core support (4) is located on the machined surface, and the height of the core support (4) is equal to the thickness of the body plus the thickness of the machining allowance.

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