A core assembly apparatus and method

Abstract

The application discloses a kind of group core device and group core method, including first sand core box, second sand core box and top core rod, first sand core box and second sand core box are enclosed to form the sand core cavity containing first sand core, second sand core box is provided with the positioning slot capable of containing second sand core, second sand core is set in positioning slot and is assembled with first sand core, sand core is combined together when making core, and there is no need to separately group sand, make the process more convenient;The connection between sand core is more stable, avoid the situation that sand core appears drift, drop during handling due to the connection between sand core is not firm, since first sand core and second sand core are connected by first sand core box and second sand core box, therefore, guarantee the accuracy of sand core positioning, so that first sand core and second sand core can always maintain appropriate positional relationship during production, avoid the situation that casting appears error due to displacement during group core process, improve the precision of casting.

Description

Technical Field

[0001] This application belongs to the field of casting technology, and in particular relates to a core assembly device and a core assembly method. Background Technology

[0002] Core assembly is a step in the cylinder head casting process, which involves combining multiple pre-made sand cores to form the internal structure of the cylinder head. After core assembly is completed, it is necessary to ensure the accuracy of the dimensions and the stability of the sand core assembly to prevent displacement or detachment of the sand cores during handling and casting, which could affect the casting effect of the cylinder head.

[0003] Existing core assembly processes typically involve bonding with adhesives and fastening with screws or nail guns. However, bonding sand cores with adhesives requires strict control of the amount of adhesive used. Insufficient adhesive results in weak bonding, while excessive adhesive leads to a large space occupied by the adhesive, potentially causing material shortages in the cylinder head and resulting in defects. Screw fastening, on the other hand, is affected by the thickness of the sand core. Thinner sand cores are easily damaged when screws penetrate them, while thicker sand cores are difficult for screws to pass through, making it impossible to secure the core. Furthermore, because the screws extend into the sand core, they can become mixed into the sand treatment system during sand removal, making them difficult to separate.

[0004] Furthermore, existing technologies all rely on manual sand assembly, which leads to deviations in the position of the sand core during the assembly process, making it impossible to accurately position the sand core. Summary of the Invention

[0005] This application provides a core assembly device and a core assembly method to solve the technical problems of the above-mentioned core assembly process requiring strict control of the amount of binder used and the inability to guarantee the accuracy of the sand core position due to the limitation of sand core thickness and the inability to guarantee the accuracy of the sand core position by manual sand assembly.

[0006] The technical solution adopted in this application is: a core assembly device, including a first sand core box, a second sand core box and a top core rod. The first sand core box and the second sand core box surround to form a sand core cavity for accommodating the first sand core. The second sand core box is provided with a positioning groove that can accommodate the second sand core. The second sand core is disposed in the positioning groove and assembled with the first sand core.

[0007] The core assembly device described in this application also has the following additional technical features:

[0008] The second sand core includes a core head connected to the first sand core and a core body extending out of the first sand core, wherein the diameter of the core head is larger than the diameter of the positioning groove.

[0009] The connection between the core head and the core body forms a step that abuts against the second sand core box.

[0010] The radius of the core head gradually decreases from near the first sand core towards the wall of the second sand core box to form a locking structure.

[0011] The core includes an abutting part that abuts against the wall of the positioning groove and a connecting part that connects the abutting part to the core head. The connecting part retracts inward to form a clearance space with the wall of the positioning groove.

[0012] The core assembly device further includes an insert disposed at the bottom of the second sand core box, the insert having a positioning hole through which the top core rod passes.

[0013] The second sand core includes a core head connected to the first sand core and a core body extending out of the first sand core. The end of the core body near the insert has an inwardly contracting section, so that a sand leakage space is formed between the contracting section and the groove wall of the positioning groove.

[0014] The insert is also provided with a sand-leaking hole that connects the sand-leaking space to the outside.

[0015] The positioning hole is provided with sand leakage holes at both ends.

[0016] A method for assembling a core includes a core assembly apparatus, which further includes the following steps:

[0017] Step S1: The second sand core is produced using a sand core box;

[0018] Step S2: Place the second sand core in the positioning groove and place the core head in the sand core cavity;

[0019] Step S3: Combine the first and second sand core boxes and inject sand into the sand core boxes;

[0020] Step S4: Separate the first and second sand core boxes to complete the core assembly.

[0021] Due to the adoption of the above technical solution, the beneficial effects obtained by this application are as follows:

[0022] 1. This application provides a positioning groove in the second sand core box that can accommodate the second sand core, so that when the first sand core is made, the second sand core can be placed into the positioning groove first, so that when the first sand core is made, the second sand core can be placed in the positioning groove and the first sand core is made, so that when the first sand core is made, the second sand core can be combined with the first sand core, eliminating the core assembly step and improving the core making efficiency. Furthermore, the sand cores are assembled together during core making. Compared to manual sand assembly, this method eliminates the need for a separate sand assembly step, simplifying the core making process. Simultaneously, because the sand cores are made as a single unit during core making, the connection between them is more stable, preventing drifting or detachment during transport due to weak connections. Moreover, since the first and second sand cores are connected via a sand core box, the accuracy of sand core positioning is ensured. This guarantees that the first and second sand cores maintain a proper positional relationship throughout the manufacturing process, preventing displacement during core assembly that could lead to casting errors and improving casting precision.

[0023] 2. This application sets the diameter of the core head of the second sand core to be larger than the diameter of the positioning groove, so that when the second sand core is placed in the positioning groove, the core head can provide a limiting and fixing function for the second sand core. Since the core head is connected to the first sand core, setting the size of the core head to be larger increases the contact area between the core head and the first sand core, thereby increasing the connection strength between the second sand core and the first sand core. On the other hand, the core head is set on the inner wall of the sand core cavity and contacts the box wall of the second sand core box. The core head plays a limiting and fixing role, preventing the second sand core from slipping out of the positioning groove and improving the positioning accuracy of the second sand core.

[0024] 3. This application provides a step at the connection between the core head and the core body that abuts against the second sand core box, so that the second sand core can be stably positioned on the second sand core box. This avoids the situation where the connection between the second sand core and the first sand core becomes loose or even cannot be connected due to the instability of the second sand core during sand shooting. This improves the stability and firmness of the connection between the first sand core and the second sand core.

[0025] 4. This application designs the core head with a gradually decreasing radius from the end closest to the first sand core towards the wall of the second sand core box, creating a tapered structure where the upper diameter is larger than the lower diameter. This allows the core head to form a locking structure when inserted into the first sand core, resulting in a more secure connection. During movement, when the first and second sand cores move relative to each other, the core head locks them together, preventing separation and further enhancing the stability of the connection.

[0026] 5. This application provides an abutment portion on the core that abuts against the wall of the positioning groove, allowing the core to abut against the wall of the positioning groove. This provides axial restraint to the core, preventing the core from wobbling and causing gaps between the first and second sand cores, thus improving the stability when the first and second sand cores are assembled. Simultaneously, the avoidance space between the connecting portion and the wall of the positioning groove reduces friction between the core and the positioning groove. This prevents excessive friction from damaging the second sand core and affecting the casting accuracy when the second sand core is placed in the positioning groove, making it easier to place the second sand core in the positioning groove and improving the accuracy of the core assembly device.

[0027] 6. This application incorporates an insert into the core-assembly device. This insert provides upward support to the second sand core box, preventing separation due to insufficient support from the connecting member between the first and second sand core boxes, which is insufficient given the large mass of the sand core within the core cavity. This increases the tightness between the two boxes and improves core-making efficiency. Furthermore, the insert has a positioning hole for the top core rod to pass through, ensuring that the top core rod applies thrust to the second sand core at a suitable position during operation. This prevents damage to the second sand core due to misalignment of the force applied by the top core rod, thus enhancing the reliability of the core-assembly device. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic diagram of the core assembly device according to one embodiment of this application;

[0030] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0031] Figure 3 This is a schematic diagram of the cylinder head assembly.

[0032] in,

[0033] 1-First sand core box; 2-Second sand core box; 21-Positioning groove; 3-Sand core cavity; 4-Top core rod; 5-First sand core; 6-Second sand core; 61-Core head; 611-Locking structure; 62-Core body; 621-Abutting part; 622-Connecting part; 623-Contraction section; 63-Step; 7-Allowing space; 8-Inlay; 81-Positioning hole; 82-Sand leakage hole; 9-Sand leakage space. Detailed Implementation

[0034] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0036] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a core assembly device, including a first sand core box 1, a second sand core box 2, and a top core rod 4. The first sand core box 1 and the second sand core box 2 enclose a sand core cavity 3 for accommodating a first sand core 5. The second sand core box 2 is provided with a positioning groove 21 that can accommodate a second sand core 6. The second sand core 6 is disposed in the positioning groove 21 and assembled with the first sand core 5.

[0040] By providing a positioning groove 21 in the second sand core box 2 that can accommodate the second sand core 6, when making the first sand core 5, the second sand core 6 can be placed into the positioning groove 21 first. When assembling the core, the second sand core 6 can be placed in the positioning groove 21 and the first sand core 5 can be made. This allows the second sand core 6 to be assembled with the first sand core 5 while making the first sand core 5, eliminating the core assembly step and improving core making efficiency. Furthermore, the sand cores are assembled together during core making. Compared to manual sand assembly, this solution eliminates the need for a separate sand assembly step, simplifying the core making process. Simultaneously, since the sand cores are made as a single unit during core making, the connection between them is more stable, preventing drifting or detachment during transport due to weak connections. Moreover, because the first sand core 5 and the second sand core 6 are connected via the first sand core box 1 and the second sand core box 2, the accuracy of sand core positioning is ensured. This guarantees that the first sand core 5 and the second sand core 6 maintain a proper positional relationship throughout the manufacturing process, preventing displacement during core assembly and thus improving casting accuracy.

[0041] As a preferred embodiment of this application, such as Figure 1As shown, the second sand core 6 includes a core head 61 connected to the first sand core 5 and a core body 62 extending out of the first sand core 5. The diameter of the core head 61 is larger than the diameter of the positioning groove 21.

[0042] By setting the diameter of the core head 61 of the second sand core 6 to be larger than the diameter of the positioning groove 21, the core head 61 can provide a limiting and fixing function for the second sand core 6 when it is placed in the positioning groove 21. Since the core head 61 is connected to the first sand core 5, setting the size of the core head 61 to be larger increases the contact area between the core head 61 and the first sand core 5, thereby increasing the connection strength between the second sand core 6 and the first sand core 5. On the other hand, the core head 61 is located on the inner wall of the sand core cavity 3 and contacts the box wall of the second sand core box 2. The core head 61 plays a limiting and fixing role, preventing the second sand core 6 from slipping out of the positioning groove 21 and improving the positioning accuracy of the second sand core 6.

[0043] Furthermore, such as Figure 2 As shown, a step 63 is formed at the connection between the core head 61 and the core body 62, which abuts against the second sand core box 2.

[0044] By providing a step 63 at the connection between the core head 61 and the core body 62 to abut against the second sand core box 2, the second sand core 6 can be stably positioned on the second sand core box 2. This avoids the second sand core 6 from shaking due to instability during sand shooting, which could lead to loosening or even failure of the connection between the second sand core 6 and the first sand core 5. This improves the stability and firmness of the connection between the first sand core 5 and the second sand core 6.

[0045] Furthermore, such as Figure 2 As shown, the core head 61 gradually decreases in radius from near the first sand core 5 toward the box wall of the second sand core box 2 to form a locking structure 611.

[0046] By configuring the core head 61 so that its radius gradually decreases from the end closest to the first sand core 5 towards the wall of the second sand core box 2, the core head 61 forms a conical structure with an upper diameter larger than its lower diameter. Therefore, when the core head 61 of the second sand core 6 is inserted into the first sand core 5, the core head 61 can form a locking structure 611, making the connection between the core head 61 and the first sand core 5 more secure. During movement, when the first sand core 5 and the second sand core 6 move relative to each other, the core head 61 can lock the first sand core 5 and the second sand core 6 together, preventing separation and further improving the stability of the connection between the first sand core 5 and the second sand core 6.

[0047] As a preferred embodiment of this method, such as Figure 2 As shown, the core 62 includes an abutting part 621 that abuts against the wall of the positioning groove 21 and a connecting part 622 that connects the abutting part 621 and the core head 61. The connecting part 622 retracts inward to form a clearance space 7 with the wall of the positioning groove 21.

[0048] By providing an abutment portion 621 on the core 62 that abuts against the wall of the positioning groove 21, the core 62 abuts against the wall of the positioning groove 21, allowing the positioning groove 21 to provide axial restraint for the core 62. This prevents the core 62 from shaking, which could lead to a loose connection between the first sand core 5 and the second sand core 6, resulting in gaps and shaking. This improves the stability when the first sand core 5 and the second sand core 6 are assembled. Simultaneously, by providing a clearance space 7 between the connecting portion 622 and the wall of the positioning groove 21, the friction between the core 62 and the positioning groove 21 is reduced. This prevents excessive friction from damaging the second sand core 6 when it is placed in the positioning groove 21, thus avoiding damage to the casting's precision. This also makes it easier to place the second sand core 6 in the positioning groove 21, improving the accuracy of the core assembly device. By incorporating an insert 8 into the core-assembly device, the insert 8 provides upward support to the second sand core box 2. This prevents the second sand core box 2 from separating from the first sand core box 1 due to insufficient support provided solely by the connector between the first and second sand core boxes 1, given the large mass of the sand core in the sand core cavity 3. This increases the tightness between the first and second sand core boxes 1 and improves core-making efficiency. Simultaneously, the insert 8 is provided with a positioning hole 81 through which the top core rod 4 passes. This ensures that the top core rod 4 can apply thrust to the second sand core 6 at an appropriate position during operation, preventing damage to the second sand core 6 due to deviations in the applied force position. This enhances the reliability of the core-assembly device.

[0049] As a preferred embodiment of this application, such as Figure 1 As shown, the core assembly device also includes an insert 8 disposed at the bottom of the second sand core box 2, and the insert 8 is provided with a positioning hole 81 through which the top core rod 4 passes.

[0050] By incorporating an insert 8 into the core-assembly device, the insert 8 provides upward support to the second sand core box 2. This prevents the second sand core box 2 from separating from the first sand core box 1 due to insufficient support provided solely by the connector between the first and second sand core boxes 1, given the large mass of the sand core in the sand core cavity 3. This increases the tightness between the first and second sand core boxes 1 and improves core-making efficiency. Simultaneously, the insert 8 is provided with a positioning hole 81 through which the top core rod 4 passes. This ensures that the top core rod 4 can apply thrust to the second sand core 6 at an appropriate position during operation, preventing damage to the second sand core 6 due to deviations in the applied force position. This enhances the reliability of the core-assembly device.

[0051] Furthermore, such as Figure 2 As shown, the second sand core 6 includes a core head 61 connected to the first sand core 5 and a core body 62 extending out of the first sand core 5. The core body 62 has an inwardly contracting section 623 at one end near the insert 8, so that a sand leakage space 9 is formed between the contracting section 623 and the groove wall of the positioning groove 21.

[0052] By providing a contraction section 623 to the box body, excess loose sand can be leaked out through the sand leakage space 9 when sand is injected into the sand core cavity 3, thus avoiding the situation where excessive loose sand in the sand core cavity 3 affects the shape of the sand core or even the precision of the casting, thereby improving the precision of the casting.

[0053] Furthermore, such as Figure 2 As shown, the insert 8 is also provided with a sand leakage hole 82 that connects the sand leakage space 9 to the outside.

[0054] By providing a sand leakage hole 82 on the insert 8, the loose sand in the sand core cavity 3 can be leaked out through the sand leakage hole 82 after the casting is completed, avoiding the situation where loose sand remains in the sand core cavity 3 and is difficult to clean, reducing the difficulty of cleaning the sand core cavity 3, and thus increasing the convenience of using the core assembly device.

[0055] Furthermore, such as Figure 2 As shown, the positioning hole 81 is provided with sand leakage holes 82 at both ends.

[0056] By providing sand leakage holes 82 at both ends of the positioning hole 81, the area of ​​sand leakage of the sand leakage holes 82 is increased, so that more loose sand can leak out through the sand leakage holes 82, thereby increasing the working efficiency of the sand leakage holes 82. At the same time, it can avoid the situation where dead corners appear in the sand core cavity 3 due to the setting of the positioning hole 81, and the sand leakage holes 82 cannot effectively leak loose sand, thus improving the working reliability of the sand leakage holes 82.

[0057] This application also provides a method for assembling a core, including the aforementioned core assembly apparatus, which further includes the following steps:

[0058] Step S1: The second sand core 6 is produced using a sand core box;

[0059] Step S2: Place the second sand core 6 in the positioning groove 21 and place the core head 61 in the sand core cavity 3;

[0060] Step S3: Combine the first sand core box 1 and the second sand core box 2, and inject sand into the sand core box;

[0061] Step S4: Separate the first sand core box 1 and the second sand core box 2 to complete the core assembly.

[0062] When using the core assembly device, taking the assembly of the first sand core 5 and the second sand core 6 as an example, the second sand core 6 is first produced by creating a sand core box, and then placed in the positioning groove 21. The core head 61 is placed in the sand core cavity 3. After the second sand core 6 is placed, the first sand core box 1 and the second sand core box 2 are combined and fixed. After fixing, sand is injected into the sand core cavity 3 to form the first sand core 5. During the formation of the first sand core 5, the second sand core 6 is directly wrapped by the first sand core 5, and the first sand core 5 and the second sand core 6 are integrated. Therefore, after sand injection, there is no need for core assembly; the first sand core 5 and the second sand core 6 are combined into one, thus eliminating the core assembly step, making the casting process simpler and faster, and improving casting efficiency.

[0063] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0064] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0065] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A core assembly device, comprising a first core box, a second core box, and a top core rod, wherein the first core box and the second core box enclose a core cavity for accommodating a first core, characterized in that, The second sand core box is provided with a positioning groove capable of accommodating the second sand core. The second sand core is disposed in the positioning groove and assembled with the first sand core. The second sand core includes a core head connected to the first sand core and a core body extending out of the first sand core. The diameter of the core head is larger than the diameter of the positioning groove. The core body includes an abutting part that abuts against the groove wall of the positioning groove and a connecting part that connects the abutting part and the core head. The connecting part retracts inward to form a clearance space with the groove wall of the positioning groove. The core assembly device further includes an insert disposed at the bottom of the second sand core box, the insert having a positioning hole through which the top core rod passes; the second sand core includes a core head connected to the first sand core and a core body extending out of the first sand core, the end of the core body near the insert having an inwardly contracting section, so that a sand leakage space is formed between the contracting section and the groove wall of the positioning groove.

2. The core assembly device according to claim 1, characterized in that, The connection between the core head and the core body forms a step that abuts against the second sand core box.

3. The core assembly device according to claim 2, characterized in that, The radius of the core head gradually decreases from near the first sand core towards the wall of the second sand core box to form a locking structure.

4. The core assembly device according to claim 1, characterized in that, The insert is also provided with a sand-leaking hole that connects the sand-leaking space to the outside.

5. A core assembly device according to claim 4, characterized in that, The positioning hole is provided with sand leakage holes at both ends.

6. A method for assembling a core, characterized in that, The assembly device as described in any one of claims 1-5 further includes the following steps: Step S1: The second sand core is produced using a sand core box; Step S2: Place the second sand core in the positioning groove and place the core head in the sand core cavity; Step S3: Combine the first and second sand core boxes and inject sand into the sand core boxes; Step S4: Separate the first and second sand core boxes to complete the core assembly.

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