Split composite sand core structure

Abstract

This utility model belongs to the field of sand core manufacturing technology, and particularly relates to a split composite sand core structure. The split composite sand core structure includes: a main core, several main cores tightly fitted together, with side plate cores respectively provided on the outermost two sides, and each main core and side plate core locked into a whole by a secondary sand-jetting process; a water jacket core and a door panel core pre-assembled with a connector and located at both ends of the main core; a secondary water channel core located on the surface of the water jacket core, with both ends abutting against the side plate cores respectively; and a top rod hole core located on the bottom surface of the water jacket core and communicating with the door panel core. The secondary water channel core, water jacket core, and top rod hole core are all assembled based on the main core, and a through-type exhaust channel is provided at the connection point. After pre-assembling multiple main cores and side plate cores, they are integrally formed using a secondary sand-jetting process, and the secondary water channel core, water jacket core, and top rod hole core are sequentially assembled with it based on the main core, reducing assembly errors.

Description

Technical Field

[0001] This utility model belongs to the field of sand core manufacturing technology, and particularly relates to a split composite sand core structure. Background Technology

[0002] In the field of sand core manufacturing for complex castings (such as engine cylinder blocks), traditional integral sand cores have the following drawbacks: low exhaust efficiency, gas cannot be quickly discharged during pouring, resulting in a high rate of porosity defects in the casting; high manufacturing cost, the integral sand core must be scrapped after it is damaged, and the material utilization rate is less than 60%.

[0003] Therefore, in related technologies, the split-type core assembly process is often used for sand core manufacturing; however, the traditional bulk core assembly has poor core assembly accuracy, and the positioning deviation is 1.5-2mm when assembling multiple cores, which affects the dimensional accuracy of the casting.

[0004] Therefore, how to reduce positioning deviation during multi-core assembly is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Utility Model Content

[0006] This disclosure provides at least one split-type composite sand core structure.

[0007] In a first aspect, embodiments of this disclosure provide a split-type composite sand core structure, including: In one optional embodiment, the main core and several main cores are tightly fitted together, and side plate cores are respectively provided on the outermost two sides, and each main core and side plate core are locked together as a whole. The water jacket core and the door panel core are pre-assembled with a connector and are located at both ends of the main core; The secondary water channel core is set on the surface of the water jacket core, and its two ends abut against the cores of the two side plates respectively; The top rod hole is located on the bottom surface of the water jacket core and is connected to the door panel core; Among them, the auxiliary water channel core, water jacket core, and top rod hole core are all assembled based on the main core, and a through-type exhaust channel is provided at the connection with the main core.

[0008] In one optional embodiment, the upper side of the water jacket core is provided with a sand outlet hole with an air outlet needle.

[0009] In one optional embodiment, a first exhaust channel is provided at the connection between the door panel core and the water jacket core head. A second exhaust channel is provided at the connection between the door panel core and the top rod hole core. A third exhaust channel is provided between the main cylinder barrel and the door panel core head; The first exhaust passage, the second exhaust passage, and the third exhaust passage are interconnected to form a continuous exhaust passage.

[0010] In one alternative embodiment, at least five sand-shooting ports are provided on the integral formed by the plurality of main cores and the side cores.

[0011] In one optional embodiment, the binder is a silica sol-based adhesive with a thickness of 0.1-0.3 mm and a cured strength ≥5 MPa.

[0012] In one alternative embodiment, a mesh-like fourth exhaust channel is provided on the back of the door panel core.

[0013] In one optional embodiment, an air outlet channel is provided on the secondary waterway, and at least two air outlet channels are connected to the sand outlet hole.

[0014] The beneficial effect of this utility model is that it provides a split composite sand core structure. After pre-assembling multiple main cores and side plate cores, it is integrally formed by a secondary sand shooting process. Based on this, the auxiliary waterway core, water jacket core, and top rod hole core are assembled with it, reducing assembly errors.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

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

[0018] Figure 1 A perspective view of the split composite sand core structure provided in the embodiments of this disclosure; Figure 2 A perspective view of the unfolded state of the split composite sand core structure provided in the embodiments of this disclosure; Figure 3 A partial sectional perspective view of the water jacket core box door panel core provided in an embodiment of this disclosure; Figure 4A partial sectional perspective view of the core of the top rod hole in the door panel core box provided in an embodiment of this disclosure; Figure 5 A partial sectional perspective view of the core of the main core box door panel provided in an embodiment of this disclosure.

[0019] In the picture: 1. Main core; 10. Sand injection port; 2. Side panel core; 3. Water jacket core; 31. Air outlet needle; 32. Sand outlet hole; 4. Door panel core; 40. First exhaust channel; 41. Second exhaust channel; 42. Third exhaust channel; 43. Fourth exhaust channel; 5. Secondary water channel core; 50. Air outlet channel; 6. Top rod hole core. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0022] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0023] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0024] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0025] Research has revealed that in the field of complex casting (such as engine block) sand core manufacturing, traditional integral sand cores have the following defects: low exhaust efficiency, gas cannot be quickly discharged during pouring, resulting in a high rate of porosity defects in the casting; high manufacturing cost, the integral sand core must be scrapped after it is damaged, and the material utilization rate is less than 60%.

[0026] Therefore, in related technologies, the split-type core assembly process is often used for sand core manufacturing; however, the traditional bulk core assembly has poor core assembly accuracy, and the positioning deviation is 1.5-2mm when assembling multiple cores, which affects the dimensional accuracy of the casting.

[0027] Therefore, how to reduce positioning deviation during multi-core assembly is a technical problem that urgently needs to be solved in this field.

[0028] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] like Figures 1 to 5 As shown, at least one embodiment provides a split composite sand core structure, including: a plurality of main cores 1 and side core plates 2 integrally formed by secondary sand blasting. To eliminate positioning deviations of the bulk sand cores, the main cores 1 and side core plates 2 are pre-assembled and then locked together as a whole by a secondary sand blasting process. The specific implementation steps are as follows: Pre-assembly stage: Multiple main cores 1 are arranged in close contact, and side core plates 2 are placed on both sides to ensure initial positioning. Secondary sand blasting and curing: Sand material (such as...) is injected through at least 5 sand blasting ports 10. Figure 2 As shown, after the sand material solidifies, it forms a non-removable integral structure. This design reduces the assembly error from the traditional 1.5-2mm to within 1mm, solving the problem of multi-core assembly accuracy. Reference function: This integral structure serves as a reference for subsequent sand core assembly, ensuring that all components use it as a reference, thus improving the overall core assembly accuracy.

[0032] Reference Appendix Figure 3 After pre-assembly with a connector, the water jacket core 3 and the door panel core 4 are positioned at both ends of the main body core 1 to ensure precise alignment under complex shapes. Pre-assembly process: A silica sol-based adhesive (0.1-0.3mm thickness, curing strength ≥5MPa) is used to bond the water jacket core 3 and the door panel core 4. This adhesive provides high-strength bonding, preventing loosening during casting. Structural setup: The pre-assembled components are fixed at both ends of the main body core 1. The upper side of the water jacket core 3 has a sand outlet 32 ​​and an air vent needle 31 for subsequent venting. Implementation points: The adhesive thickness is strictly controlled to ensure a 0.1-0.3mm gap to balance bonding strength and venting requirements.

[0033] Reference Appendix Figure 2 The auxiliary water channel core 5, water jacket core 3, and top rod hole core 6 are all assembled with the main core 1 as the reference, meaning that the main core 1 is used as the reference object during assembly to reduce cumulative errors. The auxiliary water channel core 5 is installed on the surface of the water jacket core 3, with both ends abutting against the side plate core 2. It has air venting channels 50, with at least two air venting channels 50 connected to the sand outlet holes 32 of the water jacket core 3, forming multi-path venting. The top rod hole core 6 is fixed to the bottom surface of the water jacket core 3 and connected to the door plate core 4 to ensure the stability of the mechanical structure. To prevent molten iron from clogging the venting holes during pouring, all connections are equipped with through-type venting channels, forming a continuous grid-like air channel. Reference Appendix Figure 3A first exhaust channel 40 is provided at the connection between the core of the door panel 4 and the core of the water jacket 3. A second exhaust channel 41 is provided at the connection between the core of the door panel 4 and the core of the push rod hole 6. A third exhaust channel 42 is provided between the cylinder of the main core 1 and the core of the door panel 4. Network connectivity: The first, second, and third exhaust channels 42 are interconnected to ensure that gas is quickly discharged from the inside of the sand core.

[0034] Reference Appendix Figure 5 A fourth grid-shaped venting channel 43 is added to the back of the door panel core 4 to increase the venting surface area; the venting channel 50 of the secondary water channel core 5 is connected to the sand outlet hole 32 of the water jacket core 3 to form a redundant path. Implementation logic: The gaps between all channels are designed reasonably (e.g., 0.1-0.3mm) to prevent molten iron from seeping in and to ensure smooth venting throughout the pouring process.

[0035] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0037] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A split composite sand core structure, characterized by, include: The main core (1) is tightly fitted together, and the outermost two sides are respectively provided with side plate cores (2), and each main core (1) and side plate core (2) are locked together as a whole; The water jacket core (3) and the door panel core (4) are pre-assembled with a connector and are set at both ends of the main body core (1); The secondary water channel core (5) is set on the surface of the water jacket core (3), and its two ends abut against the two side plate cores (2) respectively; The top rod hole core (6) is set on the bottom surface of the water jacket core (3) and is connected to the door panel core (4); Among them, the auxiliary water channel core (5), water jacket core (3), and top rod hole core (6) are all assembled based on the main core (1), and a through-type exhaust channel is provided at the connection with the main core (1).

2. The split-type composite sand core structure as described in claim 1, characterized in that, The water jacket core (3) is provided with a sand outlet hole (32) with an air outlet needle (31) on the upper side.

3. The split-type composite sand core structure as described in claim 1, characterized in that, The first exhaust channel (40) is provided at the connection between the core of the door panel (4) and the core of the water jacket (3). A second exhaust channel (41) is provided at the connection between the door panel core (4) and the top rod hole core (6). A third exhaust channel (42) is provided between the main core (1) cylinder and the door panel core (4) core head. The first exhaust passage (40), the second exhaust passage (41) and the third exhaust passage (42) are interconnected to form a continuous exhaust passage.

4. The split-type composite sand core structure as described in claim 1, characterized in that, The main core (1) and the two side cores (2) are provided with at least 5 sand-shooting ports (10).

5. The split-type composite sand core structure as described in claim 1, characterized in that, The binder is a silica sol-based adhesive with a thickness of 0.1-0.3 mm and a cured strength ≥5 MPa.

6. The split-type composite sand core structure as described in claim 1, characterized in that, The back of the door panel core (4) is provided with a grid-shaped fourth exhaust channel (43).

7. The split-type composite sand core structure as described in claim 2, characterized in that, The auxiliary waterway is provided with an air outlet channel (50), and at least two air outlet channels (50) are connected to the sand outlet hole (32).

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