Sand core for engine cylinder casting and core assembly method

Abstract

The present invention belongs to the technical field of engine cylinder casting, and specifically relates to a sand core and a core assembly method for engine cylinder casting, wherein the sand core comprises a plurality of sand core bodies and a connecting assembly, wherein the connecting assembly comprises: a connecting rod arranged on the non-molding surface; an insert rod and a base respectively arranged on both sides of the connecting rod; a slot opened in the base and corresponding to the insert rod; by arranging insert rods and slots that can be plugged in and matched, the number of sand core bodies can be increased or decreased, and the invention is suitable for different sand core conditions and has a wider range of applications. By arranging particles to transmit the deformation part and the positioning rod, not only can the outward movement stroke of each positioning rod be adjusted steplessly, but the movement stroke of each positioning rod can also be automatically adjusted separately, and the adaptability is good.

Description

Technical Field

[0001] The invention belongs to the field of engine cylinder casting, in particular to a sand core for engine cylinder casting and a core assembly method. Background Art

[0002] The engine block has a complex structure and is generally processed by casting. During the casting process, sand cores are required to form the cavity part of the engine block casting.

[0003] A patent application with publication number CN104741540B discloses an engine cylinder casting sand core, a core structure, a casting method and an engine cylinder. The engine cylinder casting sand core includes a first sand core body, the first sand core body has a first weak portion, the first weak portion has a first molding surface and a first non-molding surface, the first non-molding surface extends toward both sides of the first sand core body to form a convex portion; the convex portion extending from the first non-molding surface of the first weak portion of the sand core is used to strengthen the weight of the weak portion, and the convex portion does not affect the normal molding of the main oil channel position.

[0004] During the casting process of the engine cylinder block, in order to produce a complex internal structure and shape, multiple sand cores need to be combined together. The step of combining multiple separately manufactured sand cores into a whole is called core assembly. The above scheme also discloses a structure for combining multiple sand cores together. The first sand core bodies are multiple and arranged in parallel. Adjacent first sand core bodies are connected by convex parts. For different engine cylinder blocks, the number of sand core bodies used will also be different. Therefore, the sand core bodies and convex parts required for the core assembly need to be adjusted. In the above technical scheme, the sand core body and the convex part are fixed together and cannot be disassembled and combined. It is only suitable for the casting of a cylinder block of a single shape and has a small scope of application.

[0005] To this end, the present invention provides a sand core for engine cylinder casting and a core assembly method. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a sand core for casting an engine cylinder block according to the present invention comprises a plurality of sand core bodies and a connecting assembly, wherein the sand core body is used for molding an oil return cavity of the engine cylinder block, the sand core body comprises a weak portion and two thick portions, and the weak portion comprises an oil channel molding surface and a non-molding surface;

[0008] The connecting assembly includes: a connecting rod arranged on the non-molding surface; an insertion rod and a base respectively arranged on both sides of the connecting rod; a slot opened in the base and corresponding to the insertion rod, and two adjacent connecting rods are connected together through the cooperation of the insertion rod and the slot.

[0009] Preferably, the slot is open at the top, the connecting assembly further comprises a cover plate fixedly connected to the connecting rod, the plug rod is fixedly connected to the bottom end of the cover plate, and the cover plate is covered on the top of the base to form a sealed structure.

[0010] Preferably, the inner diameter of the slot is larger than the outer diameter of the insertion rod, and the connecting assembly further comprises a plurality of positioning rods movably inserted in the insertion rod and distributed in an annular manner, wherein the positioning rods extend outwards and abut against the inner side wall of the slot.

[0011] Preferably, it also includes a control component, which includes: a storage groove arranged inside the insertion rod, the positioning rod is inserted into the storage groove; an upper sealing rod and a lower sealing rod respectively inserted into the upper and lower ends of the storage groove; and particles filled in the storage groove, the upper sealing rod and the lower sealing rod squeeze the particles after moving, and the positioning rod is driven to move by the particles.

[0012] Preferably, the control assembly further comprises an upper deforming member and a lower deforming member respectively arranged at upper and lower sides of the interior of the insertion rod, the upper deforming member is connected to the upper sealing rod, and the lower deforming member is connected to the lower sealing rod.

[0013] Preferably, the control component also includes: a groove formed at the bottom of the positioning rod; a bevel plate fixedly connected to the lower sealing rod, the top end of the bevel plate being inserted into the groove, and the top end of the bevel plate being provided with a bevel for pushing the positioning rod inward.

[0014] Preferably, the width of the groove is greater than the width of the top end of the bevel plate, and the bevel plate is located outside the storage slot.

[0015] A method for assembling cores for casting an engine cylinder block, the method using the sand core for casting an engine cylinder block as described above, comprising the following steps:

[0016] Step 1: prepare a core assembly tool, and adjust the positions of a plurality of slides in the core assembly tool so that the plurality of slides are arranged in sequence along a longitudinal sliding direction;

[0017] Step 2: fix the plurality of sand core bodies on the plurality of slide seats respectively so that the plurality of sand core bodies remain parallel in the longitudinal direction;

[0018] Step 3, sliding the slide seat so that the plurality of sand core bodies remain flush in the horizontal direction, and the insertion rod is inserted into the base of the adjacent connecting rod;

[0019] Step 4: Move the positioning rod in the insertion rod outward so that the positioning rod is against the inner wall of the base and fixed. The two adjacent connecting rods are connected together through the cooperation of the insertion rod and the base, and then several sand core bodies are fixedly assembled together to complete the core assembly work of the sand core body.

[0020] Preferably, the core assembly tooling used in step one includes: an operating table; a plurality of slide seats slidably arranged on the operating table; a clamping mechanism arranged on the slide seat, the clamping mechanism being used to clamp and position the sand core body; a push rod movably arranged on the operating table, the push rod being used to push the connecting rod to move longitudinally.

[0021] Preferably, the core assembly tool further comprises a heating unit provided on the push rod, and the heating unit is used to heat the insertion rod.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The sand core and core assembly method for engine cylinder casting described in the present invention can increase or decrease the number of sand core bodies by providing pluggable plug rods and slots, which is suitable for different sand core conditions and has a wider range of applications.

[0024] 2. A sand core and a core assembly method for engine cylinder casting described in the present invention are affected by factors such as processing errors and structural deformations in the manufacturing process. If the insert rod and the slot are tightly matched, when multiple sand core bodies are assembled together, the insert rod may not be smoothly inserted into the slot. By arranging a positioning rod in the insert rod, the initial positioning rod is retracted so that it is affected by factors such as processing errors and structural deformations in the manufacturing process. If the insert rod and the slot are tightly matched, when multiple sand core bodies are assembled together, the insert rod may not be smoothly inserted into the slot. After the connecting rod is aligned, the insert rod is heated, the deformed part is deformed by the heat, and the positioning rod is automatically pushed outward. The positioning rod abuts against the inner wall of the slot, and the two adjacent connecting rods are fixed together by the abutment between the positioning rod and the slot, so that multiple sand core bodies are fixedly assembled together. It is easy to use and can maintain stability after core assembly at high temperatures. It is suitable for high-temperature casting environments.

[0025] 3. The sand core and core assembly method for engine cylinder casting described in the present invention transmits the deformation part and the positioning rod by setting particles. Not only can the outward movement stroke of each positioning rod be adjusted steplessly, but the movement stroke of each positioning rod can be automatically adjusted separately. Even if the insertion rod and the slot are not coaxial or deformed, the insertion rod and the slot can be fixedly assembled, and the adaptability is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a three-dimensional picture of multiple sand core bodies after being assembled;

[0028] Figure 2 It is a three-dimensional picture of a single sand core body;

[0029] Figure 3 It is a cross-sectional view of a single sand core body;

[0030] Figure 4 It is a cross-sectional view of the internal mechanism of the cover plate and the plug rod;

[0031] Figure 5 This is an exploded view of the plug rod and base;

[0032] Figure 6 It is an exploded view of two deformable parts and the positioning rod;

[0033] Figure 7 This is a bottom view of the positioning rod;

[0034] Figure 8 It is a schematic diagram of the core assembly tooling;

[0035] In the figure: 1. Sand core body; 11. Weak part; 111. Oil channel molding surface; 112. Non-molding surface; 12. Thick part; 2. Connecting assembly; 21. Connecting rod; 22. Inserting rod; 23. Base; 24. Slot; 25. Cover plate; 26. Positioning rod; 3. Control assembly; 31. Storage slot; 32. Upper sealing rod; 33. Lower sealing rod; 34. Particles; 35. Upper deformation member; 36. Lower deformation member; 37. Groove; 38. Bevel plate; 4. Core assembly tooling; 41. Operating table; 42. Slide; 43. Clamping mechanism; 44. Push rod; 45. Heating unit. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0037] Embodiment 1

[0038] like Figure 1-5 As shown, a sand core for casting an engine cylinder block according to an embodiment of the present invention comprises a plurality of sand core bodies 1 and a connection assembly 2. The sand core body 1 is used for molding an oil return cavity of an engine cylinder block. The sand core body 1 comprises a weak portion 11 and two thick portions 12. The weak portion 11 comprises an oil channel molding surface 111 and a non-molding surface 112.

[0039] The connecting assembly 2 includes: a connecting rod 21 arranged on the non-modeling surface 112; an insertion rod 22 and a base 23 respectively arranged on both sides of the connecting rod 21; a slot 24 opened in the base 23 and corresponding to the insertion rod 22, and two adjacent connecting rods 21 are connected together through the cooperation between the insertion rod 22 and the slot 24.

[0040] Specifically, in the sand core body 1, the weak portion 11 and the thick portion 12 can refer to the relevant structure in the patent document with the publication number CN104741540B. The weak portion 11 is the main oil channel molding portion of the engine cylinder block, and the oil channel molding surface 111 is the main oil channel molding part, that is, after the casting is completed, the processed main oil channel extends along the axial direction of the oil channel molding surface 111; the non-molding surface 112 forms the inner wall side of the oil return cavity after sand cleaning, and this surface does not involve the processing of the main oil channel. Since this part needs to reserve more metal materials for the main oil channel processing after the casting is completed, the weak portion 11 is located between the two thick portions 12, and the weak portion 11 and the thick portion 12 are a continuous integrated structure.

[0041] When assembling the core, multiple sand core bodies 1 are combined side by side, and the insertion rod 22 of each connecting rod 21 is inserted into the slot 24 of the adjacent connecting rod 21. In this way, multiple connecting rods 21 are assembled together with the cooperation of the insertion rod 22 and the slot 24, thereby completing the core assembly work of multiple sand core bodies 1; by providing pluggable insertion rods 22 and slots 24, the number of sand core bodies 1 can be increased or decreased, which is suitable for different sand core conditions and has a wider range of applications.

[0042] like Figure 2-5 As shown, the slot 24 is open at the top, and the connecting assembly 2 also includes a cover plate 25 fixedly connected to the connecting rod 21, and the plug rod 22 is fixedly connected to the bottom end of the cover plate 25. The cover plate 25 is covered on the top of the base 23 to form a sealed structure.

[0043] Specifically, after two adjacent connecting rods 21 are assembled together, the cover plate 25 covers the base 23 to seal the top of the base 23, and plays a role in sealing and protecting the structures such as the plug rod 22 during the casting process. Figure 1 For example, after a plurality of sand core bodies 1 are assembled together, a base 23 may be assembled below the left side of the leftmost connecting rod 21, and a cover plate 25 may be assembled above the right side of the rightmost connecting rod 21, so that all the connecting rods 21 are in a sealed state.

[0044] like Figure 2-6 As shown, the inner diameter of the slot 24 is larger than the outer diameter of the insertion rod 22 , and the connecting assembly 2 further comprises a plurality of positioning rods 26 movably inserted into the insertion rod 22 and distributed in an annular manner, and the positioning rods 26 extend outwards and abut against the inner wall of the slot 24 .

[0045] Specifically, the direction in which the positioning rod 26 moves toward the center of the insertion rod 22 is inward movement, and the opposite direction is outward movement. Affected by factors such as processing errors and structural deformation during the manufacturing process, if the insertion rod 22 and the slot 24 are tightly matched, when multiple sand core bodies 1 are assembled together, the insertion rod 22 may not be smoothly inserted into the slot 24. For this reason, the inner diameter of the slot 24 is designed to be larger than the outer diameter of the insertion rod 22. Initially, the positioning rod 26 is in an inwardly contracted state so that the insertion rod 22 can be inserted into the slot 24; after the insertion rod 22 is inserted into the slot 24, the positioning rod 26 is moved outward, and the positioning rod 26 abuts against the inner wall of the slot 24, thereby fixing the insertion rod 22 and the base 23 together.

[0046] like Figure 4-6 As shown, it also includes a control component 3, which includes: a storage groove 31 arranged inside the insertion rod 22, and the positioning rod 26 is inserted into the storage groove 31; an upper sealing rod 32 and a lower sealing rod 33 respectively inserted into the upper and lower ends of the storage groove 31; and particles 34 filled in the storage groove 31. After the upper sealing rod 32 and the lower sealing rod 33 move, they extrude the particles 34 and drive the positioning rod 26 to move through the particles 34.

[0047] Specifically, the particles 34 are made of a spherical high temperature resistant alloy material, the particles 34 roll in the storage groove 31 and do not flow out of the storage groove 31 , and the upper sealing rod 32 and the lower sealing rod 33 perform stepless transmission on each positioning rod 26 through the particles 34 .

[0048] like Figure 4-6 As shown, the control assembly 3 further includes an upper deformable member 35 and a lower deformable member 36 respectively disposed on upper and lower sides of the insert rod 22 , the upper deformable member 35 is connected to the upper sealing rod 32 , and the lower deformable member 36 is connected to the lower sealing rod 33 .

[0049] Specifically, the upper deforming member 35 and the lower deforming member 36 are made of a material that has the ability to automatically deform and reset with temperature changes, such as a shape memory alloy or a bimetallic strip. The deformation capacity of the upper deforming member 35 is greater than that of the lower deforming member 36. After the two deforming members are deformed with temperature, they respectively drive the two sealing rods to move up and down.

[0050] At the initial state at room temperature, Figure 4 As shown; when the temperature inside the insertion rod 22 rises, the two deformation members deform downward, thereby driving the two sealing rods to move downward. The deformation produced by the upper deformation member 35 is greater than the deformation produced by the lower deformation member 36. The upper sealing rod 32 drives the positioning rod 26 to move outward by extruding the particles 34, thereby making the positioning rod 26 press against the inner wall of the slot 24.

[0051] like Figure 4-7 As shown, the control component 3 also includes: a groove 37 opened at the bottom of the positioning rod 26; a bevel plate 38 fixedly connected to the lower sealing rod 33, the top end of the bevel plate 38 is inserted into the groove 37, and the top end of the bevel plate 38 is provided with a bevel for pushing the positioning rod 26 inward.

[0052] Specifically, after casting, when the temperature of the insert rod 22 drops from high temperature to room temperature, the two deformed parts restore their shapes and drive the two sealing rods to move upward respectively. After the lower sealing plate moves upward, the bevel plate 38 contacts the groove 37 and drives the positioning rod 26 to move inward, so that the positioning rod 26 automatically moves inward and resets.

[0053] like Figure 4 As shown, the width of the groove 37 is greater than the width of the top end of the bevel plate 38 , and the bevel plate 38 is located outside the storage slot 31 .

[0054] Specifically, after the positioning rod 26 moves outward, the bevel plate 38 is always located within the range below the groove 37; in the initial state, under the normal temperature environment before the core assembly, the state of the upper deformation member 35 and the lower deformation member 36 is as follows: Figure 4 As shown, at this time, the positioning rod 26 is in a retracted state. During the core assembly process, when the insertion rod 22 is inserted into the slot 24, the outer wall of the positioning rod 26 does not contact the inner wall of the slot 24, so that the insertion rod 22 can be smoothly inserted into the slot 24;

[0055] After a plurality of connecting rods 21 are spliced ​​together and the insert rods 22 are inserted into the slots 24, the insert rods 22 are heated to deform the deformable members, and the upper deformable members 35 drive the upper sealing rod 32 to move downward, and the lower deformable members 36 drive the lower sealing rod 33 to move downward. Since the deformation of the upper deformable members 35 is greater than the deformation of the lower deformable members 36, the particles 34 flow along the circumferential direction of the storage groove 31 under the pressure of the upper sealing rod 32, and the particles 34 push the positioning rod 26 to move outward, so that the positioning rod 26 presses against the inner wall of the slot 24. The two adjacent connecting rods 21 are fixed together under the abutment of the positioning rod 26 and the slot 24, so that the multiple sand core bodies 1 are fixedly assembled together; in the process of the particles 34 pushing the positioning rod 26 to move outward, not only can the outward movement stroke of each positioning rod 26 be adjusted steplessly, but the movement stroke of each positioning rod 26 can be automatically adjusted separately until each positioning rod 26 abuts against the inner wall of the slot 24, even if the insertion rod 22 and the slot 24 are not coaxial or deformed, the insertion rod 22 and the slot 24 can be fixedly assembled, and the adaptability is good;

[0056] When the sand core body 1 after core assembly is used to cast the engine cylinder block, the two deformed parts remain in a deformed state under a high-temperature casting environment, so the sand core body 1 after core assembly can also maintain overall assembly stability;

[0057] After the casting is completed, the sand core body 1 is taken out and cooled to room temperature, and the two deformed parts return to their original shapes and drive the two sealing rods to move upward. After the lower sealing rod 33 moves upward, the positioning rod 26 is driven inward and reset through the bevel plate 38. In this way, the entire device can be automatically reset, and can be recycled and used conveniently.

[0058] Embodiment 2

[0059] A method for assembling cores for casting an engine cylinder block, the method using the sand core for casting an engine cylinder block as described above, comprising the following steps:

[0060] Step 1: prepare the core assembly tool 4, and adjust the positions of a plurality of slides 42 in the core assembly tool 4 so that the plurality of slides 42 are arranged in sequence along the longitudinal sliding direction;

[0061] Step 2: fix the plurality of sand core bodies 1 on the plurality of slide seats 42 respectively, so that the plurality of sand core bodies 1 remain parallel in the longitudinal direction;

[0062] Step 3, slide the slide seat 42 so that the plurality of sand core bodies 1 remain flush in the horizontal direction, and the insertion rod 22 is inserted into the base 23 of the adjacent connecting rod 21;

[0063] Step 4: Move the positioning rod 26 in the insertion rod 22 outward so that the positioning rod 26 abuts against the inner wall of the base 23 and is fixed. The two adjacent connecting rods 21 are connected together through the cooperation of the insertion rod 22 and the base 23, and then the several sand core bodies 1 are fixedly assembled together to complete the core assembly work of the sand core body 1.

[0064] like Figure 8 As shown, the core assembly tool 4 used in the step 1 includes: an operating table 41; a plurality of slide seats 42 slidably arranged on the operating table 41; a clamping mechanism 43 arranged on the slide seat 42, and the clamping mechanism 43 is used to clamp and position the sand core body 1; a push rod 44 movably arranged on the operating table, and the push rod 44 is used to push the connecting rod 21 to move longitudinally.

[0065] Specifically, the clamping mechanism 43 may be a clamping claw device. Figure 8 In the figure, the direction of the X-axis is the horizontal direction, the direction of the Z-axis is the vertical direction, and a plurality of slides 42 are arranged side by side along the X-axis, and each slide 42 can move along the Z-axis direction.

[0066] like Figure 8As shown, the core assembly tool 4 further includes a heating unit 45 disposed on the push rod 44 , and the heating unit 45 is used to heat the insertion rod 22 .

[0067] Specifically, the heating unit 45 can be an electric heating device; initially, a plurality of slide seats 42 are sequentially distributed along the axial direction, and after the sand core body 1 is placed on each slide seat 42, the sand core body 1 is fixed on the slide seat 42 by the clamping mechanism 43. After being fixed, the plurality of sand core bodies 1 are in a parallel state. Figure 8 As shown, each push rod 44 is aligned with each cover plate 25 on the Z axis;

[0068] Then, start the push rod 44 to move in the positive direction along the Z axis. After the push rod 44 contacts the cover plate 25, it pushes the connecting rod 21, the sand core body 1 and the slide seat 42 to move until the multiple sand core bodies 1 are flush on the X axis. After the insertion rod 22 is inserted into the slot 24 in the base 23, start the heating unit 45 to heat the cover plate 25 and the insertion rod 22. After the temperature of the insertion rod 22 rises, the positioning rod 26 extends outward and presses against the inner wall of the slot 24, so that the two adjacent connecting rods 21 are fixedly connected, thereby fixing and assembling the multiple sand core bodies 1 together to complete the core assembly work of the sand core body 1.

[0069] Working principle: When assembling the core, the sand core body 1 is placed on each slide 42, and the sand core body 1 is fixed on the slide 42 by the clamping mechanism 43. After being fixed, the multiple sand core bodies 1 are in a parallel state; then, the push rod 44 is started to move, and after the push rod 44 contacts the cover plate 25, it pushes the connecting rod 21, the sand core body 1 and the slide 42 to move until the multiple sand core bodies 1 are flush on the X axis, so that the insertion rod 22 of each connecting rod 21 is inserted into the slot 24 of the adjacent connecting rod 21; after the insertion rod 22 is inserted into the slot 24 in the base 23, the heating unit 45 is started to heat the cover plate 25 and the insertion rod 22. After heating and the temperature of the insertion rod 22 increases, the deformation piece is deformed, the upper deformation piece 35 drives the upper sealing rod 32 to move downward, and the lower deformation piece 36 drives the lower sealing rod 33 to move downward. Since the deformation amount of the upper deformation piece 35 is greater than the deformation amount of the lower deformation piece 36, the particles 34 flow along the circumferential direction of the storage groove 31 under the extrusion of the upper sealing rod 32, and the particles 34 push the positioning rod 26 to move outward. After the positioning rod 26 extends outward, it abuts against the inner wall of the slot 24, so that the two adjacent connecting rods 21 are fixedly connected, and then the multiple sand core bodies 1 are fixedly assembled together to complete the core assembly work of the sand core body 1.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sand core for engine cylinder casting, characterized in that: The invention comprises a plurality of sand core bodies (1) and a connection assembly (2), wherein the sand core body (1) is used for molding an oil return cavity of an engine cylinder block, the sand core body (1) comprises a weak portion (11) and two thick portions (12), the weak portion (11) comprises an oil channel molding surface (111) and a non-molding surface (112), and the connection assembly (2) comprises: A connecting rod (21) provided on the non-modeling surface (112); An insertion rod (22) and a base (23) respectively arranged on both sides of the connecting rod (21); A slot (24) is provided in the base (23) and corresponds to the insertion rod (22); two adjacent connecting rods (21) are connected together through the cooperation between the insertion rod (22) and the slot (24); the slot (24) is open at the top; and the inner diameter of the slot (24) is greater than the outer diameter of the insertion rod (22); A cover plate (25) fixedly connected to the connecting rod (21), the insert rod (22) fixedly connected to the bottom end of the cover plate (25), and the cover plate (25) covers the top of the base (23) to form a sealed structure; a plurality of positioning rods (26) movably inserted into the insertion rod (22) and distributed in an annular manner, wherein the positioning rods (26) extend outwards and abut against the inner side wall of the slot (24); It also includes a control component (3), wherein the control component (3) includes: A storage groove (31) is provided inside the insertion rod (22), and the positioning rod (26) is inserted into the storage groove (31); An upper sealing rod (32) and a lower sealing rod (33) respectively plugged into the upper and lower ends of the storage groove (31); The granules (34) filled in the storage groove (31) are squeezed by the upper sealing rod (32) and the lower sealing rod (33) after they move, and the positioning rod (26) is driven to move by the granules (34).

2. The sand core for engine cylinder casting according to claim 1, characterized in that: The control assembly (3) further comprises an upper deformable member (35) and a lower deformable member (36) respectively arranged on upper and lower sides of the insert rod (22); the upper deformable member (35) is connected to the upper sealing rod (32), and the lower deformable member (36) is connected to the lower sealing rod (33).

3. The sand core for engine cylinder casting according to claim 2, characterized in that: The control component (3) further comprises: A groove (37) formed at the bottom of the positioning rod (26); A bevel plate (38) is fixedly connected to the lower sealing rod (33), the top end of the bevel plate (38) is inserted into the groove (37), and the top end of the bevel plate (38) is provided with a bevel for pushing the positioning rod (26) inwardly.

4. The sand core for engine cylinder casting according to claim 3, characterized in that: The width of the groove (37) is greater than the width of the top end of the bevel plate (38), and the bevel plate (38) is located outside the storage groove (31).

5. A method for assembling cores for casting an engine cylinder block, the method using a sand core for casting an engine cylinder block according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Prepare a core assembly tool (4), wherein the core assembly tool (4) comprises: Operation table (41); A plurality of slide seats (42) slidably arranged on the operating table (41); a clamping mechanism (43) provided on the slide seat (42), the clamping mechanism (43) being used to clamp and position the sand core body (1); a push rod (44) movably arranged on the operation, the push rod (44) being used to push the connecting rod (21) to move longitudinally; a heating unit (45) provided on the push rod (44), the heating unit (45) being used to heat the insertion rod (22); Adjusting the positions of a plurality of slide seats (42) in the core assembly tooling (4) so ​​that the plurality of slide seats (42) are arranged in sequence along a longitudinal sliding direction; Step 2: fix the plurality of sand core bodies (1) on the plurality of slide seats (42) respectively, so that the plurality of sand core bodies (1) remain parallel in the longitudinal direction; Step 3: Slide the slide seat (42) so that the plurality of sand core bodies (1) remain flush in the horizontal direction, and the insertion rod (22) is inserted into the base (23) of the adjacent connecting rod (21); Step 4: Move the positioning rod (26) disposed in the insertion rod (22) outward so that the positioning rod (26) abuts against the inner wall of the base (23) and is fixed therein, and two adjacent connecting rods (21) are connected together through the cooperation of the insertion rod (22) and the base (23), thereby fixing and assembling the plurality of sand core bodies (1) together, thereby completing the core assembly work of the sand core body (1).

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