Core splitting and assembling method for engine body sand core and engine body sand core

Abstract

The invention discloses an engine body sand core splitting and assembling method and an engine body sand core The engine body sand core splitting and assembling method comprises the steps that S1, the engine body sand core is subjected to split core design, the engine body sand core is divided into N split cores, and each split core is divided into n sand cores; s2, assembling the sand cores of each group of sub-cores to obtain sub-cores; and S3, the N sub-cores are put into the sand mold in sequence, the mold is closed, and core assembly and mold grinding are completed. According to the scheme, a plurality of sand cores of a machine body are divided into N groups to obtain N groups of sub-cores, and each group of sub-cores is provided with at least two sand cores; then assembling the sand cores of each group of sub-cores to obtain sub-cores; and finally, the N sub-cores are sequentially put into a sand mold, the mold is closed, and core assembly and mold grinding are completed. According to the machine body sand core splitting and assembling method disclosed by the scheme, the multiple sand cores of the machine body are divided into the multiple groups, the number of the sand cores in each group of the sand cores is small, the accumulative error of single sub-core assembling is reduced, then the error of single sub-core assembling after sub-core discharging of the sand mold is reduced, and the size precision of a casting is improved.

Description

Technical Field

[0001] The present application relates to the field of casting technology, and in particular to a core splitting and assembling method of a sand core for an engine body and an engine body sand core. Background Art

[0002] In the related art, the core assembly process of the engine body sand core is that the large cylinder core group is assembled as a whole, and the remaining sand cores are individually assembled one by one by manual handling or crane lifting.

[0003] It is difficult to ensure the position accuracy between adjacent sand cores by manual handling or crane lifting. The accumulated errors of a single core will affect the dimensional accuracy of the casting.

[0004] Therefore, how to improve the dimensional accuracy of castings has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] The present application proposes a sand core splitting and assembling method for an engine body to improve the dimensional accuracy of a casting. The present application also proposes an engine body sand core.

[0006] In order to achieve the above-mentioned purpose, the present application provides a method for dividing and assembling a sand core of a machine body, comprising:

[0007] S1. Design the machine body sand core by splitting it into N split cores, each split core is divided into n sand cores, N and n are positive integers and N≥2, n≥2;

[0008] S2. Assembling each of the core sand cores to obtain the core;

[0009] S3. The N sub-cores are sequentially put into the sand mold and assembled into a box to complete the core assembly and box grinding.

[0010] Preferably, in the above-mentioned method for dividing and assembling the sand core of the machine body, the assembling of the sand cores of each group of the divided cores in S2 is specifically as follows:

[0011] Each group of the sand cores of the core segments is assembled by a core assembly jig.

[0012] Preferably, in the above-mentioned core-splitting and core-assembling method of the machine body sand core, the N cores in S3 are sequentially lowered into the sand mold as follows:

[0013] The sub-cores are sequentially lifted from the core assembly jig and lowered into the sand mold.

[0014] Preferably, in the above-mentioned core division and assembly method of the machine body sand core, the machine body sand core is divided into N sub-cores in S1, and each sub-core is divided into n sand cores, specifically,

[0015] The sand core of the engine body is divided into four parts: camshaft hole core group, large cylinder core group, left side core group and right side core group.

[0016] The camshaft hole core component is divided into three types of sand cores: a camshaft hole core, a left water inlet core and a right water inlet core.

[0017] The large cylinder core component is divided into three types of sand cores: large cylinder core, front end core and rear end core.

[0018] The left side core group and the right side core group are composed of three types of sand cores: side cores, low-temperature water cavity cores and air cavity cores;

[0019] The assembling of each group of the split core sand cores in S2 is specifically as follows:

[0020] Assembling the camshaft hole core group by using a camshaft hole core group core jig;

[0021] Assembling the large cylinder core assembly by using a large cylinder core assembly jig;

[0022] The left side core group and the right side core group are assembled by using a side core group core jig.

[0023] Preferably, in the above-mentioned core-separating and core-assembling method of the machine body sand core, assembling the camshaft hole core assembly by means of a camshaft hole core assembly jig is specifically as follows:

[0024] Placing a plurality of camshaft hole cores into a first positioning structure of a camshaft hole core assembly jig, and locking the plurality of camshaft hole cores by bolts;

[0025] Rotate the camshaft hole core assembly jig in a first direction so that the left water inlet core is vertically lowered into the camshaft hole core assembly jig, and lock the left water inlet core on the camshaft hole core by means of bolts;

[0026] Rotate the camshaft hole core assembly jig in a second direction so that the right water inlet core is vertically lowered into the camshaft hole core assembly jig, and lock the right water inlet core on the camshaft hole core by means of bolts;

[0027] The first direction and the second direction are opposite.

[0028] Preferably, in the above-mentioned core-splitting and core-assembling method of the machine body sand core, assembling the large cylinder core assembly by a large cylinder core assembly jig is specifically as follows:

[0029] The large cylinder core, the front end core and the rear end core are sequentially placed into the second positioning structure of the large cylinder core assembly mold, and the large cylinder core, the front end core and the rear end core are locked by bolts.

[0030] Preferably, in the above-mentioned core-splitting and core-assembling method of the machine body sand core, the left side core assembly and the right side core assembly are assembled by using a side core assembly jig as follows:

[0031] Placing the side core into the third positioning structure of the side core assembly mold;

[0032] The side core assembly jig is rotated to vertically place the low-temperature water cavity core and the air cavity core into the side core assembly jig in sequence, and the low-temperature water cavity core and the air cavity core are locked on the side core by bolts.

[0033] Preferably, in the above-mentioned core-splitting and core-assembling method of the machine body sand core, the N cores in S3 are sequentially lowered into the sand mold as follows:

[0034] According to the lowering positions of the camshaft hole core group, the large cylinder core group, the left side core group and the right side core group indicated by the first mark of the sand mold, the camshaft hole core group, the large cylinder core group, the left side core group and the right side core group are lowered in sequence.

[0035] Preferably, in the above-mentioned core separation and assembly method of the machine body sand core, the combination box in S3 is specifically:

[0036] The sand mold is assembled according to the assembly position indicated by the second mark of the sand mold.

[0037] An engine body sand core is manufactured by using the core division and core assembly method of the engine body sand core as described in any one of the above schemes.

[0038] The machine body sand core splitting and core assembly method provided in the embodiment of the present application includes: S1. splitting the core of the machine body sand core, dividing the machine body sand core into N split cores, and each split core is divided into n sand cores; S2. Assembling the sand cores of each group of cores to obtain split cores; S3. N split cores are sequentially lowered into sand molds, combined into boxes, and the core assembly and box grinding are completed. This scheme divides the multiple sand cores of the machine body into N groups to obtain N groups of cores, each group of cores has at least two sand cores; then assemble the sand cores of each group of cores to obtain split cores; finally, N split cores are sequentially lowered into sand molds, combined into boxes, and the core assembly and box grinding are completed. The machine body sand core splitting and core assembly method disclosed in this scheme, by dividing the multiple sand cores of the machine body into multiple groups, each group of cores has a small number of sand cores, thereby reducing the cumulative error of a single split core assembly, thereby reducing the error of a single split core group after the split core is lowered into the sand mold, and improving the dimensional accuracy of the casting.

[0039] This solution also discloses an engine body sand core, which is manufactured by the core-splitting and core-assembling method of the engine body sand core disclosed in any of the above solutions. Since the core-splitting and core-assembling method of the engine body sand core has the above technical effects, the engine body sand core manufactured by the core-splitting and core-assembling method of the engine body sand core also has the same technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0041] Figure 1 It is a flow chart of the method for dividing and assembling the sand core of the machine body of the present application;

[0042] Figure 2 It is a schematic diagram of the structure in which the sand core of the machine body of the present application is divided into four sub-cores;

[0043] Figure 3 It is a structural schematic diagram of the camshaft hole core group of the present application;

[0044] Figure 4 It is a structural schematic diagram of the large cylinder core group of the present application;

[0045] Figure 5 It is a structural schematic diagram of the left side core group of this application;

[0046] Figure 6 It is a structural schematic diagram of the sand mold of this application.

[0047] The accompanying drawings are as follows:

[0048] 1- camshaft hole core group; 11- camshaft hole core; 12- left water inlet core; 13- right water inlet core; 2- large cylinder core group; 21- large cylinder core; 22- front end core; 23- rear end core; 3- left side core group; 31- side core; 32- low temperature water cavity core; 33- air cavity core; 4- right side core group; 5- sand mold; 51- first mark; 52- second mark. DETAILED DESCRIPTION

[0049] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. The described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0050] It should be noted that, for ease of description, only the parts related to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features.

[0051] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0052] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0053] See also Figure 1-Figure 6 .

[0054] Some embodiments of the present application disclose a method for dividing and assembling a sand core of a machine body, comprising:

[0055] S1. Perform core splitting design on the machine body sand core, divide the machine body sand core into N cores, and each core is divided into n sand cores, where N is a positive integer and N≥2;

[0056] S2. Assemble the cores of each group of cores to obtain cores;

[0057] S3.N sub-cores are sequentially lowered into the sand mold 5 and combined into a box, completing the core assembly and box grinding.

[0058] The sand core of the machine body is used to make the inner shape of the casting.

[0059] The machine body sand core is split into cores, which includes dividing the machine body sand core into N cores and dividing each core into n sand cores. After the core splitting is completed, the sand cores obtained by the core splitting are manufactured.

[0060] The number of sand cores divided from each sub-core can be equal or unequal.

[0061] After core separation, the sand core of each core separation is assembled to obtain a core separation, and finally N core separations are sequentially lowered into the sand mold 5 and combined to complete the core assembly and grinding.

[0062] Through reasonable core splitting design, the machine body is divided into multiple sand cores, and each sand core is made separately, which can reduce the casting veins produced by the cylinder body, improve the quality of castings, simplify the casting process, and improve the production efficiency of castings.

[0063] The principle of core division is that each sand core is easy to make and assemble after division.

[0064] The machine body sand core splitting and core assembling method disclosed in the present scheme divides the machine body sand core into N split cores by performing split core design on the machine body sand core, and each split core is divided into n sand cores. Each group of cores has a small number of sand cores, thereby reducing the cumulative error of assembling a single split core, and further reducing the error of a single split core after being assembled into a split core lower sand mold 5, thereby improving the dimensional accuracy of the casting.

[0065] The machine body sand core splitting and assembling method disclosed in the present solution makes each core group as modular as possible, and can realize division of labor and simultaneous core assembly, so as to improve the assembly efficiency of the split cores to a certain extent.

[0066] In some embodiments, the multiple sand cores of the machine body are divided into N groups in S1 as follows:

[0067] The engine body is divided into four sub-cores: camshaft hole core group 1, large cylinder core group 2, left side core group 3 and right side core group 4.

[0068] The camshaft hole core set 1 includes three types of sand cores: a camshaft hole core 11, a left water inlet channel core 12 and a right water inlet channel core 13.

[0069] The large cylinder core group 2 includes three types of sand cores: a large cylinder core 21, a front end core 22 and a rear end core 23.

[0070] The left side core group 3 and the right side core group 4 both include three types of sand cores, namely, a side core 31 , a low-temperature water cavity core 32 and an air cavity core 33 .

[0071] The camshaft hole core 11 is a sand core for forming the camshaft hole, the left water inlet core 12 is a sand core for forming the left water inlet, and the right water inlet core 13 is a sand core for forming the right water inlet;

[0072] The large cylinder core 21 is used to form the cylinder block of the engine. The large cylinder core 21 can be made of an integral core or a split core. The split core of the large cylinder core 21 has multiple large cylinder cores 21. The front end core 22 is used to form the front end of the engine, including the installation position of accessories such as the generator, water pump, air conditioning compressor and fan, and the rear end core 23 is used to form the rear end of the engine.

[0073] The side cores 31 of the left side core group 3 and the right side core group 4 are used to form complex structures and channels on the side of the engine, including cooling water channels, oil channels and channels of other auxiliary systems. The low-temperature water cavity core 32 is used to form the cooling water cavity inside the engine. The air cavity core 33 is used to form the air cavity inside the engine, including intake ducts, exhaust ducts or other air flow channels that need precise forming.

[0074] Before designing the sand core, the core assembly process should be deduced first, the core assembly order should be determined, and then the structure of the core head and core head seat should be determined.

[0075] In this scheme, the multiple sand cores of the machine body are divided into a camshaft hole core group 1, a large cylinder core group 2, a left side core group 3 and a right side core group 4, such as Figure 2 As shown, the camshaft hole core group 1 is located at the bottom, the large cylinder core group 2 is located above the camshaft hole core group 1, and the left side core group 3 and the right side core group 4 are located on the left and right sides of the large cylinder core group 2.

[0076] The above-mentioned grouping method of the sand cores is helpful for the subsequent core placement in the sand mold 5 .

[0077] The grouping of sand cores is not limited to the above-mentioned forms, and can also be other classification methods, which can be designed according to different machine models.

[0078] In some embodiments, the assembling of the sand cores of each group of cores in S2 is specifically as follows:

[0079] Assemble the camshaft hole core assembly 1 by using a camshaft hole core assembly jig;

[0080] Assemble the large cylinder core assembly 2 by using the large cylinder core assembly jig;

[0081] The left side core group 3 and the right side core group 4 are assembled by using a side core group core jig.

[0082] This scheme assembles the camshaft hole core group 1, the large cylinder core group 2, the left side core group 3 and the right side core group 4 respectively through the camshaft hole core assembly jig, the large cylinder core assembly jig and the side core assembly jig. The position of the sand core of each group of cores is controlled by the core assembly jig to reduce the cumulative error caused by a single lower core and further improve the dimensional accuracy of the casting.

[0083] In addition, the left side core group 3 and the right side core group 4 are assembled using the same side core assembly jig, which reduces the types of jigs and reduces the production cost of the engine body sand core.

[0084] The camshaft hole core assembly 1 is assembled by using the camshaft hole core assembly jig as follows:

[0085] Place a plurality of camshaft hole cores 11 into the first positioning structure of the camshaft hole core assembly jig, and lock the plurality of camshaft hole cores 11 by means of bolts;

[0086] Rotate the camshaft hole core assembly jig in a first direction so that the left water inlet core 12 is vertically lowered into the camshaft hole core assembly jig, and the left water inlet core 12 is locked on the camshaft hole core 11 by bolts;

[0087] Rotate the camshaft hole core assembly jig in the second direction, so that the right water inlet core 13 is vertically lowered into the camshaft hole core assembly jig, and the right water inlet core 13 is locked on the camshaft hole core 11 by bolts;

[0088] The first direction and the second direction are opposite.

[0089] Multiple camshaft hole cores 11 are positioned using the first positioning structure of the camshaft hole core assembly jig to ensure that the position of the camshaft hole core 11 is accurate; after the camshaft hole core 11 is positioned by the first positioning structure, it is fixed to the camshaft hole core assembly jig using bolts to ensure that when the left water inlet core 12 and the right water inlet core 13 are assembled with the camshaft hole core 11, the position of the camshaft hole core 11 will not change, which not only ensures the accurate position of the camshaft hole core 11, but also ensures the accurate position of the left water inlet core 12 and the right water inlet core 13.

[0090] After the left water inlet core 12, the right water inlet core 13 and the camshaft hole core assembly 1 are assembled, the left water inlet core 12 and the right water inlet core 13 are locked on the camshaft hole core 11 by bolts, and the three form a whole, ensuring that the relative positions of the camshaft hole core assembly 1 will not change during the lifting process.

[0091] In addition, the camshaft hole core assembly jig has a rotating function, which is convenient for lowering the left water inlet core 12 and the right water inlet core 13 at the optimal angle, and is easy to operate, and can improve the assembly accuracy of the left water inlet core 12 and the right water inlet core 13 to a certain extent. It should be noted here that the base frame of the camshaft hole core assembly jig is fixed, and the camshaft hole core assembly jig has a rotating part, which drives the multiple camshaft hole cores 11 to rotate together, so that after the left water inlet core 12 and the right water inlet core 13 are lowered into the camshaft hole core assembly jig, the positions of the left water inlet core 12 and the right water inlet core 13 and the camshaft hole core 11 are the assembly positions.

[0092] The left water inlet channel core 12, the right water inlet channel core 13 and the camshaft hole core 11 are fixed by bolts, which are reliably fixed and will not cause the sand core position to move due to loosening during hoisting and transportation, resulting in uneven wall thickness.

[0093] The specific steps of assembling the large cylinder core assembly 2 by using the large cylinder core assembly mold are as follows:

[0094] The large cylinder core 21, the front end core 22 and the rear end core 23 are sequentially placed into the second positioning structure of the large cylinder core assembly jig, and the large cylinder core 21, the front end core 22 and the rear end core 23 are locked by bolts.

[0095] The large cylinder core assembly jig positions the large cylinder core 21, the front end core 22 and the rear end core 23 through the second positioning structure to ensure the accurate positions of the large cylinder core 21, the front end core 22 and the rear end core 23, and then locks the large cylinder core 21, the front end core 22 and the rear end core 23 through bolts to form a split core, which is convenient for subsequent lifting and transportation.

[0096] The left side core group 3 and the right side core group 4 are respectively assembled by side core assembly core jigs, and the assembly process can be carried out simultaneously or separately. The left side core group 3 and the right side core group 4 use the same structure of the core assembly jigs.

[0097] The specific steps of assembling the left side core group 3 and the right side core group 4 by using the side core group core jig are as follows:

[0098] Place the side core 31 into the third positioning structure of the side core assembly jig, and lock the side core 31 in the side core assembly jig by bolts;

[0099] The side core assembly jig is rotated to vertically place the low-temperature water cavity core 32 and the air cavity core 33 into the side core assembly jig in sequence, and the low-temperature water cavity core 32 and the air cavity core 33 are locked on the side core 31 by bolts.

[0100] The side core 31 is positioned by the third positioning structure of the side core assembly jig to ensure that the position of the side core 31 is accurate; after the side core 31 is positioned by the third positioning structure, the side core 31 is locked in the side core assembly jig by bolts to ensure that when the low-temperature water cavity core 32 and the air cavity core 33 are assembled with the side core 31, the position of the side core 31 will not change, which not only ensures the accurate position of the side core 31, but also ensures the accurate position of the low-temperature water cavity core 32 and the air cavity core 33.

[0101] After the low-temperature water cavity core 32, the air cavity core 33 and the side core 31 are assembled, the low-temperature water cavity core 32, the air cavity core 33 and the side core 31 are locked by bolts to form a whole, ensuring that the relative positions of the three will not change during the lifting of the side core 31 group.

[0102] In addition, the side core assembly jig has a rotating function, which is convenient for lowering the low-temperature water cavity core 32 and the air cavity core 33 at the optimal angle, and is easy to operate, and can improve the assembly accuracy of the low-temperature water cavity core 32 and the air cavity core 33 to a certain extent. It should be noted here that the bottom frame of the side core assembly jig is fixed, and the side core assembly jig has a rotating part, which drives the side core 31 to rotate together, so that after the low-temperature water cavity core 32 and the air cavity core 33 are lowered into the side core assembly jig, the position of the low-temperature water cavity core 32 and the air cavity core 33 and the side core 31 is the assembly position.

[0103] The low-temperature water cavity core 32, the air cavity core 33 and the side core 31 are fixed by bolts, which are reliably fixed and will not cause the sand core to move due to loosening during hoisting and transportation, resulting in uneven wall thickness.

[0104] The N sub-cores in S3 are sequentially placed into the sand mold 5 as follows:

[0105] According to the insertion positions of the camshaft hole core group 1, the large cylinder core group 2, the left side core group 3 and the right side core group 4 indicated by the first mark 51 of the sand mold 5, the camshaft hole core group 1, the large cylinder core group 2, the left side core group 3 and the right side core group 4 are inserted in sequence.

[0106] like Figure 6 As shown, there are three groups of first identifications 51, one group is used to indicate the lowering position of the camshaft hole core group 1 and the large cylinder core group 2, one group is used to indicate the lowering position of the left side core group 3, and the remaining group is used to indicate the lowering position of the right side core group 4.

[0107] The S3 closing box is specifically:

[0108] The sand mold 5 is closed according to the closing position indicated by the second mark 52.

[0109] The first mark 51 and the second mark 52 can ensure the positional relationship of each sub-core and simplify the box grinding process.

[0110] The present solution also discloses an engine body sand core, which is manufactured by the core division and core assembly method of the engine body sand core disclosed in any one of the above solutions.

[0111] Since the core-splitting and core-assembling method of the body sand core has the above-mentioned technical effects, the engine body sand core made by the core-splitting and core-assembling method of the body sand core also has the same technical effects, which will not be repeated here.

[0112] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. The scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in this application (but not limited to) to form a technical solution.

Claims

1. A method for dividing and assembling a core of a machine body sand core, characterized in that: include: S1. Design the machine body sand core by splitting it into N split cores, each split core is divided into n sand cores, N and n are positive integers and N≥2, n≥2; S2. Assembling each of the core sand cores to obtain the core; S3. The N sub-cores are sequentially lowered into the sand mold (5), and the molds are assembled to complete the core assembly and mold grinding.

2. The core separation and assembly method of the machine body sand core according to claim 1, characterized in that: The assembling of each group of the split core sand cores in S2 is specifically as follows: The sand cores of each group of the split cores are assembled by a core assembly jig.

3. The core separation and assembly method of the machine body sand core according to claim 2, characterized in that: The N sub-cores in S3 are sequentially placed into the sand mold (5) as follows: The split cores are sequentially lifted from the core assembly jig and lowered into the sand mold (5).

4. The core separation and assembly method of the machine body sand core according to claim 1, characterized in that: In S1, the machine body sand core is divided into N sub-cores, and each sub-core is divided into n sand cores, specifically, The body sand core is divided into four sub-cores: a camshaft hole core group (1), a large cylinder core group (2), a left side core group (3) and a right side core group (4). The camshaft hole core group (1) is divided into three types of sand cores, namely, a plurality of camshaft hole cores (11), a left water inlet channel core (12) and a right water inlet channel core (13). The large cylinder core group (2) is divided into three types of sand cores: a large cylinder core (21), a front end core (22) and a rear end core (23). The left side core group (3) and the right side core group (4) are divided into three types of sand cores: side cores (31), low-temperature water cavity cores (32) and air cavity cores (33); The assembling of each group of the split core sand cores in S2 is specifically as follows: Assembling the camshaft hole core assembly (1) by means of a camshaft hole core assembly core jig; Assembling the large cylinder core assembly (2) by means of a large cylinder core assembly jig; The left side core group (3) and the right side core group (4) are assembled by means of a side core group core jig.

5. The core separation and assembly method of the machine body sand core according to claim 4, characterized in that: The camshaft hole core group (1) is assembled by using a camshaft hole core group core jig, specifically, Placing a plurality of camshaft hole cores (11) into a first positioning structure of a camshaft hole core assembly jig, and locking the plurality of camshaft hole cores (11) by means of bolts; Rotating the camshaft hole core assembly jig in a first direction so that the left water inlet channel core (12) is vertically lowered into the camshaft hole core assembly jig, and locking the left water inlet channel core (12) on the camshaft hole core (11) by means of bolts; Rotating the camshaft hole core assembly jig in a second direction so that the right water inlet channel core (13) is vertically lowered into the camshaft hole core assembly jig, and the right water inlet channel core (13) is locked on the camshaft hole core (11) by means of bolts; The first direction and the second direction are opposite.

6. The core separation and assembly method of the machine body sand core according to claim 4, characterized in that: The large cylinder core assembly (2) is assembled by using a large cylinder core assembly mold as follows: The large cylinder core (21), the front end core (22), and the rear end core (23) are sequentially placed into the second positioning structure of the large cylinder core assembly jig, and the large cylinder core (21), the front end core (22), and the rear end core (23) are locked by bolts.

7. The core separation and assembly method of a machine body sand core according to claim 4, characterized in that: The left side core group (3) and the right side core group (4) are assembled by using a side core group core jig as follows: Placing the side core (31) into the third positioning structure of the side core assembly mold; The side core assembly jig is rotated so that the low-temperature water cavity core (32) and the air cavity core (33) are vertically placed in sequence into the side core assembly jig, and the low-temperature water cavity core (32) and the air cavity core (33) are fastened to the side core (31) by bolts.

8. The core separation and assembly method of a machine body sand core according to claim 7, characterized in that: The N sub-cores in S3 are sequentially placed into the sand mold (5) as follows: The camshaft hole core group (1), the large cylinder core group (2), the left side core group (3) and the right side core group (4) are sequentially lowered according to the lowering positions of the camshaft hole core group (1), the large cylinder core group (2), the left side core group (3) and the right side core group (4) indicated by the first mark (51) of the sand mold (5).

9. The core separation and assembly method of a machine body sand core according to claim 7, characterized in that: The S3 intermediate box is specifically: The sand mold (5) is closed according to the closing position indicated by the second mark (52) of the sand mold (5).

10. An engine body sand core, characterized in that: The machine body sand core is manufactured by the core division and core assembly method as described in any one of claims 1 to 9.

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