A multi-slide side core-pulling structure mold and a method of using the same

Abstract

The application belongs to the technical field of molds, and particularly provides a multi-sliding-block side-pulling structure mold and a use method thereof. The mold comprises a static mold assembly and a dynamic mold assembly, the static mold assembly is matched with the dynamic mold assembly, the dynamic mold assembly comprises a dynamic mold first mold body and a dynamic mold second mold body, and the dynamic mold second mold body is provided with a side-pulling mechanism on one side close to the dynamic mold first mold body. The use method of the mold comprises the following steps: S1, mold preheating: heating the dynamic mold body and the static mold body; S2, sand shooting and solidification: shooting coated sand into a mold cavity after mold closing, then performing exhaust, and finally solidifying; S3, mold opening and core pulling: separating the dynamic mold from the static mold, simultaneously driving a first-stage core-pulling sliding block to move by a gas cylinder, and driving a second-stage core-pulling sliding block to complete a core-pulling action by cooperation of the first-stage core-pulling sliding block and the second-stage core-pulling sliding block; and S4, ejection and core taking: working of a dynamic mold material-retreating structure, ejecting a sand core, and completing core making. According to the mold and the use method, the structure is compact, the operation is reliable, and linkage and synchronous core pulling can be realized.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to a multi-slider side-pull structure mold and its usage method. Background Technology

[0002] Hot-box core making is a key process in modern casting production for manufacturing complex sand cores. This process uses a heated mold to inject coated sand into the mold cavity, allowing the resin to solidify and form a precisely structured sand core. With the development of the manufacturing industry, the requirements for the complexity of the internal structure of castings are increasing, which directly leads to increasingly complex geometries for sand cores, often featuring numerous side holes, slots, bosses, and undercut structures.

[0003] To form these complex features, the mold must be designed with a corresponding lateral core-pulling mechanism. Traditional lateral core-pulling molds typically use a direct core-pulling method with a hydraulic cylinder and a slider, where one hydraulic or pneumatic cylinder directly drives a slider to complete the core-pulling in one direction. For complex sand cores with multiple core-pulling requirements in different directions, this method requires multiple independent drive systems, resulting in a large, complex mold structure, high manufacturing costs, and challenges in controlling the synchronization and sequence of multiple core-pulling actions, which can easily damage the mold or sand core due to action interference. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention provides a multi-slider side-pulling structure mold and its usage method, which features a compact structure, reliable operation, and the ability to achieve synchronized core pulling.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-slider side-pull structure mold and its usage method, comprising a static mold assembly and a moving mold assembly, wherein the static mold assembly and the moving mold assembly are matched, the moving mold assembly includes a first moving mold body and a second moving mold body, the first moving mold body is located between the static mold assembly and the second moving mold body, and a side-pull mechanism is provided on the side of the second moving mold body closer to the first moving mold body;

[0006] The side-pulling mechanism includes two side-pulling slider slots opened on the second mold body of the moving mold. The two side-pulling slider slots are symmetrically arranged. One end of each side-pulling slider slot is connected to two primary slider positioning guide slots. The end of the primary slider positioning guide slot away from the side-pulling slider slot is connected to the secondary slider positioning guide slot.

[0007] A primary core-pulling slider is slidably connected within the side-pulling slider groove. One end of the primary core-pulling slider is connected to the output end of the drive cylinder. The side of the primary core-pulling slider away from the drive cylinder is slidably disposed within the primary slider positioning guide groove. A positioning groove is formed on the end face of the primary core-pulling slider near the secondary slider positioning guide groove. A secondary core-pulling slider is slidably disposed within the secondary slider positioning guide groove. A positioning protrusion is provided on the side of the secondary core-pulling slider near the positioning groove, and the positioning protrusion matches the positioning groove.

[0008] As a further improvement of the present invention, the static mold assembly includes a static mold base, a static mold bottom plate, a static mold connecting plate, and a static mold body. The static mold base passes through the static mold bottom plate and the static mold connecting plate in sequence and is fitted into a bottom groove opened on the static mold body. A first threaded pin is fitted inside the static mold base. The first threaded pin is screwed into a threaded groove at the bottom of the bottom groove. The static mold connecting plate is fixedly connected to the static mold body by a plurality of second threaded pins.

[0009] As a further improvement of the present invention, the static mold body has an inner cavity, and an inner insert is provided in the inner cavity. One end of the inner insert is fixedly connected to the static mold body connecting plate through an inner insert connecting shaft. The end of the inner insert away from the static mold body connecting plate extends out of the inner cavity and into the inner cavity of the moving mold first mold body.

[0010] As a further improvement of the present invention, the moving mold assembly further includes a moving mold inner insert, a moving mold first base plate, a moving mold second base plate, and a moving mold first connecting plate;

[0011] The inner insert of the moving mold body is disposed inside the inner cavity of the second moving mold body. A material ejection shaft is fixedly connected to the side of the inner insert of the moving mold body near the first moving mold base plate. The material ejection shaft passes through the first moving mold base plate and is clearance-fitted with the first moving mold base plate. The first moving mold base plate is fixedly connected to the second moving mold base plate and the first moving mold connecting plate by a third threaded pin. The first moving mold connecting plate is fixedly connected to the first moving mold base plate, the second moving mold body, and the first moving mold body by a fourth threaded pin.

[0012] As a further improvement of the present invention, the secondary slider positioning guide groove is set at a certain inclination angle with the primary slider positioning guide groove, and the minimum included angle between the secondary slider positioning guide groove and the horizontal line is 35 degrees.

[0013] As a further improvement of the present invention, a side-pull-out clearance groove is provided at the outer end of the connection between the primary slider positioning guide groove and the secondary slider positioning guide groove.

[0014] As a further improvement of the present invention, the first-stage core-pulling slider and the second-stage core-pulling slider are respectively provided with an installation gap of 0.1mm to 0.3mm between them and the side walls of the first-stage slider positioning guide groove and the second-stage slider positioning guide groove.

[0015] A method of using the multi-slider side-pull structure mold includes the following steps:

[0016] S1: Mold preheating: Heat the first and second moving mold bodies to 190-210℃, and the stationary mold body to 180-200℃;

[0017] S2: Sand injection and curing: Inject the coated sand into the cavity after mold closing for 2-4 seconds, then vent for 0.5-1.5 seconds, and finally cure for 70-90 seconds;

[0018] S3: Mold opening and core pulling: The moving mold assembly and the stationary mold assembly are separated. At the same time, the cylinder drives the first-stage core pulling slider to move, and through its cooperation with the second-stage core pulling slider, it drives the second-stage core pulling slider to complete the core pulling action within 2 seconds.

[0019] S4: Ejection and Core Removal: The moving mold ejection structure ejects the sand core, completing the core making process.

[0020] The beneficial effects of this invention are:

[0021] By employing a linkage design where a primary core-pulling slider drives a secondary core-pulling slider, only one cylinder is needed to simultaneously drive two core-pulling sliders in different directions to complete the core-pulling action. This method simplifies the mold structure, reduces the number of independent driving components, and allows the mold to achieve more functions within a limited space, resulting in a more compact and rational overall structure. The entire core-pulling process is driven by the cylinder simultaneously with mold opening and is completed in a very short time, seamlessly connecting with the ejection action. This significantly shortens the mold's production cycle and improves core-making efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a multi-slider side-pulling structure mold according to the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of a multi-slider side-pull mold;

[0024] Figure 3 This is a schematic diagram of the internal structure of the static mold assembly;

[0025] Figure 4 This is a schematic diagram of the internal structure of the moving mold assembly;

[0026] Figure 5 This is a schematic diagram of the side-drawing mechanism;

[0027] Figure 6This is a schematic diagram of the core-pulling slider assembly structure.

[0028] In the diagram: 1-Static mold base, 2-Static mold base plate, 3-Static mold connecting plate, 4-Static mold body, 400-Bottom groove, 401-Threaded groove; 5-Moving mold first mold body, 6-Cylinder base, 7-Cylinder, 8-Moving mold first base plate, 9-Moving mold base, 10-Moving mold second base plate, 11-Moving mold first connecting plate, 12-Moving mold second mold body, 13-Base, 14-First threaded pin, 15-Second threaded pin, 16-Third threaded pin, 17-Fourth threaded pin 18 - Inner insert connecting shaft, 19 - Static mold body insert, 20 - Side pull slider groove, 21 - Primary slider positioning guide groove, 22 - Side pull clearance groove, 23 - Secondary slider positioning guide groove, 24 - Secondary core pull slider, 240 - Positioning protrusion, 25 - Primary core pull slider, 250 - Positioning groove, 26 - Static mold body cavity, 27 - Moving mold first mold body cavity, 28 - Moving mold second mold body cavity, 29 - Moving mold body insert, 30 - Ejector shaft, 31 - Sand injection port. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific examples described herein are merely illustrative and not intended to limit the invention. The directional terms used in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention. Furthermore, in all embodiments, the same reference numerals denote the same elements.

[0030] Please see Figures 1 to 6 The present invention provides a multi-slider side-pull structure mold, including a static mold assembly and a moving mold assembly, wherein the static mold assembly and the moving mold assembly cooperate with each other.

[0031] The static mold assembly includes a static mold body 4, and bases 13 are fixedly connected to both ends of one side of the static mold body 4.

[0032] A stationary mold body 4 has a stationary mold body base plate 2 on one side. At each of the four bottom corners of the stationary mold body base plate 2, a stationary mold body base 1 is provided. The stationary mold body base 1 is a stepped cylindrical shape. The end of the stationary mold body base 1 with the larger radius is located on the outer side of the stationary mold body base plate 2, and the end of the stationary mold body base 1 with the smaller radius passes through the stationary mold body base plate 2 and fits into the bottom groove 400 opened at the bottom of the stationary mold body 4. A through hole is provided inside the stationary mold body base 1, and a first threaded pin 14 fits into the through hole. The inner end of the first threaded pin 14 fits into the threaded groove 401 opened at the bottom of the bottom groove 400.

[0033] As a further explanation of this embodiment, the static mold base plate 2 and the static mold body 4 can be fixed by the static mold body base 1 and its internal first threaded pin 14.

[0034] A static mold body connecting plate 3 is provided between the static mold body base plate 2 and the static mold body 4. The static mold body connecting plate 3 has through holes at its four corners and is fitted onto the static mold body base 1. Several countersunk holes are provided around the static mold body connecting plate 3. A second threaded pin 15 is fitted into the countersunk holes. The second threaded pin 15 passes through the static mold body connecting plate 3 and fits into the corresponding through holes on the static mold body 4, and passes through the entire static mold body 4.

[0035] As a further explanation of this embodiment, the static mold body connecting plate 3 and the static mold body 4 can be fixedly connected by the second threaded pin 15.

[0036] The static mold body connecting plate 3 also has several countersunk holes in its middle, and an inner insert connecting shaft 18 fits into the countersunk holes, passing through the static mold body connecting plate 3. The end of the inner insert connecting shaft 18 away from the static mold body connecting plate 3 is fixedly connected to the inner insert 19 of the static mold body. The inner insert 19 of the static mold body fits into the inner cavity 26 of the static mold body 4, and the end of the inner insert 19 away from the static mold body connecting plate 3 protrudes out of the inner cavity 26 of the static mold body.

[0037] A moving mold assembly is provided on the side of the stationary mold body 4 away from the stationary mold body connecting plate 3, and a sand injection port 31 is opened on the side of the stationary mold body 4 near the moving mold assembly. The moving mold assembly includes a moving mold first mold body 5, one side of which is tightly fitted to the stationary mold body 4. The moving mold first mold body 5 has an inner cavity 27, which is connected to the inner cavity 26 of the stationary mold body. The inner insert 19 of the stationary mold body passes through the inner cavity 27 of the moving mold first mold body, and the end of the inner insert 19 of the stationary mold body is flush with the end of the moving mold first mold body 5 away from the stationary mold body 4.

[0038] The side of the moving mold first mold body 5 away from the stationary mold body 4 is closely fitted with the moving mold second mold body 12. The side of the moving mold second mold body 12 away from the moving mold first mold body 5 is provided with a moving mold first base plate 8. The two ends of the side of the moving mold first base plate 8 away from the moving mold second mold body 12 are respectively fixedly connected to the moving mold body base 9.

[0039] A first connecting plate 11 for the moving mold is provided on the side of the first base plate 8 away from the second mold body 12. The first connecting plate 11 for the moving mold has several countersunk holes, and a fourth threaded pin 17 is fitted in the countersunk holes. The fourth threaded pin 17 passes through the first connecting plate 11, the first base plate 8, the second mold body 12 and the first mold body 5 in sequence.

[0040] As a further explanation of this embodiment, the first connecting plate 11 of the moving mold, the first base plate 8 of the moving mold, the second mold body 12 of the moving mold, and the first mold body 5 of the moving mold can be fixedly connected by the fourth threaded pin 17.

[0041] A second base plate 10 of the moving mold is provided on the side of the first connecting plate 11 of the moving mold away from the first base plate 8 of the moving mold. A countersunk hole is provided on the second base plate 10 of the moving mold, and a third threaded pin 16 is fitted in the countersunk hole. The third threaded pin 16 passes through the second base plate 10 of the moving mold, the first connecting plate 11 of the moving mold, and the first base plate 8 of the moving mold in sequence.

[0042] As a further explanation of this embodiment, the second base plate 10 of the moving mold, the first connecting plate 11 of the moving mold, and the first base plate 8 of the moving mold can be fixedly connected by the third threaded pin 16.

[0043] The moving mold second mold body 12 has an internal cavity 28, and an internal insert 29 is disposed within the internal cavity 28. A ejector shaft 30 is fixedly connected to the side of the internal insert 29 closest to the moving mold first base plate 8. The side of the ejector shaft 30 away from the internal insert 29 penetrates the moving mold first base plate 8. The ejector shaft 30 and the moving mold first base plate 8 are clearance-fitted and slidably connected. The end of the ejector shaft 30 is located between the moving mold first base plate 8 and the moving mold first connecting plate 11.

[0044] As a further explanation of this embodiment, by pushing the ejector shaft 30, the insert 29 in the moving mold body can be moved toward the stationary mold assembly, thereby completing the ejection of the sand core part.

[0045] A side-pull mechanism is provided on the side of the moving mold second mold body 12 near the moving mold first mold body 5. The side-pull mechanism includes a slider groove arranged circumferentially along the inner cavity 28 of the moving mold second mold body. The slider groove includes side-pull slider grooves 20 symmetrically arranged on both sides of the inner cavity 28 of the moving mold second mold body. The inner ends of the side-pull slider grooves 20 are respectively connected to the first-stage slider positioning guide grooves 21, and the two are arranged perpendicularly.

[0046] The side of the primary slider positioning guide groove 21 away from the side-pulling slider groove 20 is connected to the secondary slider positioning guide groove 23. The secondary slider positioning guide groove 23 and the primary slider positioning guide groove 21 are at a certain inclination angle. The minimum included angle between the secondary slider positioning guide groove 23 and the horizontal line is 35 degrees.

[0047] A secondary side-pull-avoidance groove 22 is provided at the outer end of the connection between the secondary slider positioning guide groove 23 and the primary slider positioning guide groove 21. The secondary side-pull-avoidance groove 22 is fan-shaped.

[0048] As a further explanation of this embodiment, the slider groove of the side-pulling mechanism is formed by the interconnected side-pulling slider groove 20, the secondary slider positioning guide groove 23 and the primary slider positioning guide groove 21. The secondary side-pulling clearance groove 22 is used to prevent the slider from being restricted in its movement.

[0049] On both sides of the first base plate 8 of the moving mold near the second mold body 12 of the moving mold, cylinder bases 6 are respectively provided, and cylinders 7 are fixed on the cylinder bases 6. A first-stage core-pulling slider 25 is fixed to the output end of the cylinder 7. The first-stage core-pulling slider 25 is approximately "C" shaped. One end of the first-stage core-pulling slider 25 fits in the side core-pulling slider groove 20, and the other end of the first-stage core-pulling slider 25 is set along the first-stage slider positioning guide groove 21.

[0050] The end of the primary core-pulling slider 25 away from the side-pulling slider groove 20 extends to the connection between the secondary slider positioning guide groove 23 and the primary slider positioning guide groove 21. A positioning groove 250 is provided at the end of the primary core-pulling slider 25 near the connection, and the positioning groove 250 is opened in the horizontal direction.

[0051] A secondary core-pulling slider 24 is fitted inside the secondary slider positioning guide groove 23. A positioning protrusion 240 is provided on the side of the secondary core-pulling slider 24 near the secondary slider positioning guide groove 23. The positioning protrusion 240 matches the positioning groove 250.

[0052] As a further explanation of this embodiment, a 0.2mm installation gap is left between the first-stage core-pulling slider 25 and the side wall of the second-stage slider positioning guide groove 23, and between the second-stage core-pulling slider 24 and the side wall of the first-stage slider positioning guide groove 21, to ensure smooth linkage movement. The first-stage core-pulling slider 25 is pulled to both sides by the cylinder 7. While the first-stage core-pulling slider 25 moves along the first-stage slider positioning guide groove 21, it pulls the second-stage core-pulling slider 24. Because the second-stage core-pulling slider 24 is limited by the side wall of the second-stage slider positioning guide groove 23, the positioning protrusion 240 moves along the positioning groove 250, and the two gradually misalign, thereby ensuring that the positioning protrusion 240 can move along the second-stage slider positioning guide groove 23 to complete the side-pulling movement.

[0053] The usage method of the above-mentioned multi-slider side-pulling structure mold is as follows:

[0054] S1: Pre-production preparation - mold preheating

[0055] Start the heating system and heat the first moving mold body 5 and the second moving mold body 12 to 200°C. Heat the stationary mold body 4 to 190°C. Ensure that the entire mold reaches and stabilizes at the predetermined temperature.

[0056] S2: Sandblasting and Curing Sandblasting

[0057] Inject the coated sand into the closed mold cavity through the injection nozzle 31. Set the injection time to 2-4 seconds. After injection, vent the mold. Set the venting time to 0.5-1.5 seconds to ensure that the gas in the cavity is fully expelled. Keep the mold closed and use the high temperature of the mold to harden the coated sand. Set the curing time to 70-90 seconds.

[0058] S3: Mold Opening and Core Pulling

[0059] After curing, the moving mold assembly begins its mold-opening motion, separating from the stationary mold assembly. Simultaneously with the mold opening, cylinder 7 begins operation. The connecting rod of cylinder 7 pulls two primary core-pulling sliders 25. The movement of the two primary core-pulling sliders 25 synchronously drives a total of four secondary core-pulling sliders 24. All primary core-pulling sliders 25 complete the core-pulling action along the direction of the secondary slider positioning guide grooves 23. The entire core-pulling process is completed within 2 seconds.

[0060] S4: Push-out and Completion

[0061] After the moving mold body completes its ejection stroke, the moving mold ejection structure, i.e., the ejection system, begins to work, ejecting the solidified sand core from the moving mold. Once the core is made, the sand core is removed, and the mold is ready for the next production cycle.

[0062] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above-described embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A multi-slider side-pull structure mold, comprising a stationary mold assembly and a moving mold assembly, characterized in that, The static mold assembly is matched with the dynamic mold assembly. The dynamic mold assembly includes a first dynamic mold body (5) and a second dynamic mold body (12). The first dynamic mold body (5) is located between the static mold assembly and the second dynamic mold body (12). The second dynamic mold body (12) is provided with a side-pulling mechanism on the side closer to the first dynamic mold body (5). The side-pull mechanism includes two side-pull slider slots (20) opened on the second mold body (12) of the moving mold. The two side-pull slider slots (20) are symmetrically arranged. One end of each side-pull slider slot (20) is connected to two primary slider positioning guide slots (21). The end of the primary slider positioning guide slot (21) away from the side-pull slider slot (20) is connected to the secondary slider positioning guide slot (23). A primary core-pulling slider (25) is slidably connected in the side-pulling slider groove (20). One end of the primary core-pulling slider (25) is connected to the output end of the driving cylinder (7). The side of the primary core-pulling slider (25) away from the driving cylinder (7) is slidably disposed in the primary slider positioning guide groove (21). A positioning groove (250) is provided on the end face of the primary core-pulling slider (25) near the secondary slider positioning guide groove (23). A secondary core-pulling slider (24) is slidably disposed in the secondary slider positioning guide groove (23). A positioning protrusion (240) is provided on the side of the secondary core-pulling slider (24) near the positioning groove (250). The positioning protrusion (240) matches the positioning groove (250).

2. The multi-slider side-pulling structure mold according to claim 1, characterized in that, The static mold assembly includes a static mold base (1), a static mold bottom plate (2), a static mold connecting plate (3), and a static mold body (4). The static mold base (1) passes through the static mold bottom plate (2) and the static mold connecting plate (3) in sequence and fits into the bottom groove (400) opened on the static mold body (4). The static mold base (1) is fitted with a first threaded pin (14), which is screwed into the threaded groove (401) at the bottom of the bottom groove (400). The static mold connecting plate (3) is fixedly connected to the static mold body (4) by a number of second threaded pins (15).

3. The multi-slider side-pulling structure mold according to claim 2, characterized in that, The static mold body (4) has a static mold inner cavity (26) inside. A static mold inner insert (19) is provided in the static mold inner cavity (26). One end of the static mold inner insert (19) is fixedly connected to the static mold body connecting plate (3) through the inner insert connecting shaft (18). The end of the static mold inner insert (19) away from the static mold body connecting plate (3) passes through the static mold inner cavity (26) and extends into the moving mold first mold body (5) moving mold first mold inner cavity (27).

4. The multi-slider side-pulling structure mold according to claim 1, characterized in that, The moving mold assembly also includes a moving mold body insert (29), a moving mold first base plate (8), a moving mold second base plate (10), and a moving mold first connecting plate (11). The inner insert (29) of the moving mold body is located in the inner cavity (28) of the second moving mold body (12). The inner insert (29) of the moving mold body is fixedly connected to the ejector shaft (30) on the side near the first moving mold base plate (8). The ejector shaft (30) passes through the first moving mold base plate (8) and is clearance-fitted with the first moving mold base plate (8). The first moving mold base plate (8) is fixedly connected to the second moving mold base plate (10) and the first moving mold connecting plate (11) through the third threaded pin (16). The first moving mold connecting plate (11) is fixedly connected to the first moving mold base plate (8), the second moving mold body (12) and the first moving mold body (5) through the fourth threaded pin (17).

5. The multi-slider side-pulling structure mold according to claim 1, characterized in that, The secondary slider positioning guide groove (23) is set at a certain angle to the primary slider positioning guide groove (21), and the minimum included angle between the secondary slider positioning guide groove (23) and the horizontal line is 35 degrees.

6. The multi-slider side-pulling structure mold according to claim 1, characterized in that, A side-pull-outlet groove (22) is provided at the outer end of the connection between the first-level slider positioning guide groove (21) and the second-level slider positioning guide groove (23).

7. The multi-slider side-pulling structure mold according to claim 1, characterized in that, The first-stage core-pulling slider (25) and the second-stage core-pulling slider (24) have an installation gap of 0.1 mm to 0.3 mm between them and the side walls of the first-stage slider positioning guide groove (21) and the second-stage slider positioning guide groove (23), respectively.

8. A method of using a multi-slider side-pulling structure mold according to any one of claims 1-7, characterized in that, Includes the following steps: S1: Mold preheating: Heat the first moving mold body (5) and the second moving mold body (12) to 190-210℃, and the stationary mold body (4) to 180-200℃; S2: Sand injection and curing: Inject the coated sand into the cavity after mold closing for 2-4 seconds, then vent for 0.5-1.5 seconds, and finally cure for 70-90 seconds; S3: Mold opening and core pulling: The moving mold assembly and the stationary mold assembly are separated. At the same time, the cylinder (7) drives the first-level core pulling slider (25) to move, and through its cooperation with the second-level core pulling slider (24), it drives the second-level core pulling slider (24) to complete the core pulling action within 2 seconds. S4: Ejection and Core Removal: The moving mold ejection structure ejects the sand core, completing the core making process.

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