Double-layer casting mold for large castings

Abstract

A double-layer casting mold for large castings relates to the technical field of metal casting and comprises two sand boxes which are correspondingly arranged up and down, sand molds are arranged in the two sand boxes, molten steel is poured into the sand molds through pouring gates on the sand molds, enters a lower-layer pouring gate communicated with the lower portion through a main pouring gate and flows into a cavity, and the molten steel rises along with the liquid level of the molten steel. A supporting frame is arranged on the upper end face of the upper sand box, the supporting frame and the pouring gate are arranged correspondingly, and steel balls are put into the main pouring gate through the supporting frame to block the lower pouring gate, so that the molten steel sequentially enters the upper cavity through the upper pouring gate; according to the utility model, the support frame is arranged on the sand box, and the steel balls are put into the main pouring gate to block the lower pouring gate according to the casting time, so that molten steel enters the cavity orderly; the heat conduction pipe is arranged on the supporting frame, heat generated by molten steel is conducted upwards, and the situation that workers are hurt by high temperature through the supporting frame is avoided.

Description

Technical Field

[0001] This utility model relates to the field of metal casting technology, and in particular to a double-layer casting mold for large castings. Background Technology

[0002] For casting large parts, double or multi-layer gating systems are often used to improve the dispersion and stability of molten steel flow. In multi-layer gating systems, molten steel first enters the sand mold through the lower gating system under gravity. When the molten steel reaches the set height, the amount of molten steel in the lower gating system increases, and the molten steel flows into the mold cavity through the upper gating system. This process has a certain effect on the dispersion of molten steel. However, because the lower gating system is continuously open, some molten steel will enter the mold cavity through the lower gating system. The temperature of the molten steel at the bottom is low, while the temperature of the newly entered molten steel is high, which can easily affect the forming of the casting and may even cause the casting to be scrapped. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model discloses a double-layer casting mold for large castings. This utility model sets a sand mold on a sand box and sets a support frame on the sand box to cooperate with the casting port of the sand mold, so as to achieve convenient sealing of the lower sprue and avoid the alternating effects of hot and cold molten steel on the casting.

[0004] To achieve the aforementioned objective, this utility model adopts the following technical solution:

[0005] A large double-layer casting mold includes two sand boxes arranged vertically and vertically. Each sand box contains a sand mold. Molten steel is poured into the sand mold through a casting port on the sand mold. The molten steel flows into the cavity through the main gating system and into the lower gating system connected to the main gating system. As the molten steel level rises, the molten steel enters the cavity through the upper gating system connected to the main gating system to complete the casting of the workpiece. A support frame is provided on the upper surface of the upper sand box. The support frame is arranged corresponding to the casting port. Steel balls are inserted into the main gating system through the support frame to block the lower gating system, so that the molten steel can enter the upper cavity through the upper gating system in an orderly manner.

[0006] The sand box is provided with reinforcing ribs on its sides, and two lifting seats are symmetrically provided on both sides of the sand box. The upper end face and the lower end face of the sand box are respectively provided with an upper connecting ring and a lower connecting ring that are coaxially arranged with it.

[0007] The upper end face of the upper connecting ring is provided with a limiting groove, and there are through holes distributed at the four corners of the upper connecting ring, with the support frame set in the through holes.

[0008] The lower end face of the lower connecting ring is provided with a limiting ring, and the limiting ring of the upper sand box is set in the limiting groove of the lower sand box.

[0009] The main gating system is longitudinally arranged on one side of the cavity, and the diameter of the main gating system gradually decreases from top to bottom. The steel ball is stuck in the main gating system between the upper gating system and the lower gating system.

[0010] The support frame includes a strut, a retaining ring, a guide tube, and a sleeve. The retaining ring is fitted onto the strut, and the lower end of the strut is inserted into a through hole in the upper sand box near the casting port. The retaining ring is positioned above the upper connecting ring. The upper end of the strut is provided with a guide tube, one side of which is connected to the upper end of the strut, and the other end of which extends downward toward the casting port. A sleeve is provided on the guide tube, fitted onto the lower end of the guide tube, and slidably connected to the guide tube. A handle is provided on the side of the sleeve.

[0011] The lower end of the sleeve is provided with a longitudinally arranged heat-conducting pipe, the end of the sleeve passes through the side of the heat-conducting pipe, and the lower end of the heat-conducting pipe is correspondingly arranged with the casting port.

[0012] This utility model describes a large double-layer casting mold for castings. This utility model is highly practical and very convenient to use. By setting a support frame on the sand box, steel balls are dropped into the main gating system according to the casting time to block the lower gating system, so that molten steel enters the mold cavity in an orderly manner. By setting a heat-conducting pipe on the support frame, the heat generated by the molten steel is conducted upward, avoiding the high temperature from harming the workers through the support frame. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of the sand box of this utility model;

[0015] Figure 3 This is a cross-sectional view of the sand mold of this utility model;

[0016] Figure 4 This is a cross-sectional view of the support frame of this utility model;

[0017] In the diagram: 1. Sand box; 2. Reinforcing rib; 3. Upper connecting ring; 4. Lower connecting ring; 5. Limiting groove; 6. Lifting seat; 7. Sand mold; 8. Casting gate; 9. Support frame; 10. Perforation; 11. Limiting ring; 12. Workpiece; 13. Main runner; 14. Upper runner; 15. Lower runner; 16. Steel ball; 17. Support rod; 18. Clamping ring; 19. Guide tube; 20. Sleeve; 21. Heat conduction tube; 22. Handle. Detailed Implementation

[0018] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0019] Combined with appendix Figures 1-4A large double-layer casting mold for casting includes two sand boxes 1 arranged vertically and vertically. The two sand boxes 1 contain sand molds 7. Molten steel is poured into the sand mold 7 through the casting port 8 on the sand mold 7. The molten steel flows into the cavity through the main gating channel 13 and enters the lower gating channel 15 connected below. As the molten steel level rises, the molten steel enters the cavity through the upper gating channel 14 connected to the main gating channel 13 to complete the casting of the workpiece 12. The upper end face of the upper sand box 1 is provided with a support frame 9, which is arranged corresponding to the casting port 8. Steel balls 16 are inserted into the main gating channel 13 through the support frame 9 to block the lower gating channel 15, so that the molten steel enters the upper cavity through the upper gating channel 14 in an orderly manner.

[0020] The side of the sand box 1 is provided with reinforcing ribs 2, and two lifting seats 6 are symmetrically provided on both sides of the sand box 1. The lifting slings are hung on the lifting seats 6 to facilitate the lifting of the sand box 1. The upper end face and the lower end face of the sand box 1 are respectively provided with an upper connecting ring 3 and a lower connecting ring 4 coaxially arranged with them.

[0021] The upper end face of the upper connecting ring 3 is provided with a limiting groove 5, and the four corners of the upper connecting ring 3 are provided with through holes 10, and the support frame 9 is set in the through holes 10.

[0022] The lower end face of the lower connecting ring 4 is provided with a limiting ring 11. The limiting ring 11 of the upper sand box 1 is set in the limiting groove 5 of the lower sand box 1. The limiting ring 11 and the limiting groove 5 are matched to facilitate the mold closing of the upper and lower sand boxes 1.

[0023] The main gating system 13 is longitudinally arranged on one side of the cavity. The diameter of the main gating system 13 gradually decreases from top to bottom. The steel ball 16 is stuck in the main gating system 13 between the upper gating system 14 and the lower gating system 15 to prevent high-temperature molten steel from entering the lower cavity through the lower gating system 15 and to prevent hot and cold molten steel from affecting the workpiece 12.

[0024] The support frame 9 includes a support rod 17, a retaining ring 18, a guide tube 19, and a sleeve 20. The retaining ring 18 is fitted onto the support rod 17. The lower end of the support rod 17 is inserted into the through hole 10 of the upper sand box 1 near the casting port 8. The retaining ring 18 is positioned above the upper connecting ring 3. The upper end of the support rod 17 is provided with a guide tube 19. One end of the guide tube 19 is connected to the upper end of the support rod 17, and the other end of the guide tube 19 extends downward toward the casting port 8. The guide tube 19 is provided with a sleeve 20, which is fitted onto the lower end of the guide tube 19 and is slidably connected to the guide tube 19. The side of the sleeve 20 is provided with a handle 22. The sleeve 20 is extended by the handle 22 to facilitate alignment of the sleeve 20 with the casting port 8. A steel ball 16 is inserted from the upper end of the guide tube 19, and the steel ball 16 slides along the guide tube 19 and the sleeve 20 toward the casting port 8.

[0025] The lower end of the sleeve 20 is provided with a longitudinally arranged heat-conducting pipe 21. The end of the sleeve 20 passes through the side of the heat-conducting pipe 21. The lower end of the heat-conducting pipe 21 is correspondingly arranged with the casting port 8. After the steel ball 16 enters the heat-conducting pipe 21, it falls into the casting port 8 along the heat-conducting pipe 21 and falls down along the main gating 13 and gets stuck on the inner wall of the main gating 13, thus completing the sealing of the lower gating 15. The high temperature generated by the molten steel is discharged upward through the heat-conducting pipe 21 to avoid the high temperature from harming the operator.

[0026] The embodiment describes a large double-layer casting mold for castings. During use, a crane is used to hoist the upper sand box 1. Slings are attached to a hoisting base 6 for easy hoisting of the sand box 1. The upper sand box 1 is then hoisted onto the lower sand box 1. A limiting ring 11 of the upper sand box 1 is positioned within a limiting groove 5 of the lower sand box 1. The limiting ring 11 and the limiting groove 5 cooperate to complete mold closing. A support frame 9 is installed in the through hole 10 near the casting port 8. The sleeve 20 is extended by the handle 22 to align the lower end of the heat-conducting pipe 21 with the casting port 8. Then, the heat-conducting pipe 21 is rotated to one side of the casting port 8, allowing heat to flow through the casting port 8 into the main runner 13. Molten steel is poured into the mold cavity through the main gating system 13 and flows into the lower gating system 15. Based on the calculated casting time, steel balls 16 are placed from the top of the guide tube 19. The steel balls 16 slide along the guide tube 19 and the sleeve 20 towards the casting port 8. After entering the heat-conducting pipe 21, the steel balls 16 fall into the casting port 8 along the heat-conducting pipe 21 and fall down along the main gating system 13, where they are stuck on the inner wall of the main gating system 13, thus sealing the lower gating system 15. This allows the molten steel to enter the mold cavity in an orderly manner, preventing hot and cold molten steel from affecting the workpiece 12. The high temperature generated by the molten steel is discharged upward through the heat-conducting pipe 21, preventing the high temperature from harming the operators.

[0027] The parts of this utility model not described in detail are prior art. Although this utility model has been specifically shown and introduced in conjunction with preferred embodiments, there are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of this utility model. However, those skilled in the art should understand that various changes in form and detail can be made to this utility model without departing from the spirit and scope of this utility model as defined by the appended claims, and all such changes shall be within the protection scope of this utility model.

Claims

1. A double-layer casting mold for large castings, comprising two sand boxes (1) arranged vertically and vertically, each sand box (1) containing a sand mold (7). Molten steel is poured into the sand mold (7) through a casting port (8) on the sand mold (7). The molten steel flows into the cavity through a main gating channel (13) and a lower gating channel (15) connected below. As the molten steel level rises, the molten steel enters the cavity through an upper gating channel (14) connected to the main gating channel (13) to complete the casting of the workpiece (12). The mold is characterized by: The upper sand box (1) is provided with a support frame (9), which is set in correspondence with the casting port (8). Steel balls (16) are injected into the main gating channel (13) through the support frame (9) to block the lower gating channel (15), so that the molten steel can enter the upper cavity through the upper gating channel (14) in an orderly manner.

2. The large casting double-layer casting mold according to claim 1, characterized in that: The side of the sand box (1) is provided with reinforcing ribs (2), and two lifting seats (6) are symmetrically provided on both sides of the sand box (1). The upper end face and the lower end face of the sand box (1) are respectively provided with an upper connecting ring (3) and a lower connecting ring (4) coaxially arranged with it.

3. The large casting double-layer casting mold according to claim 2, characterized in that: The upper connecting ring (3) has a limiting groove (5) on its upper end face, and the upper connecting ring (3) has perforations (10) distributed at its four corners, with the support frame (9) set inside the perforations (10).

4. The large casting double-layer casting mold according to claim 2, characterized in that: The lower connecting ring (4) is provided with a limiting ring (11) on its lower end face, and the limiting ring (11) of the upper sand box (1) is set in the limiting groove (5) of the lower sand box (1).

5. The double-layer casting mold for large castings according to claim 1, characterized in that: The main gating system (13) is longitudinally arranged on one side of the cavity. The diameter of the main gating system (13) gradually decreases from top to bottom. The steel ball (16) is stuck in the main gating system (13) between the upper gating system (14) and the lower gating system (15).

6. The large casting double-layer casting mold according to claim 1, characterized in that: The support frame (9) includes a strut (17), a retaining ring (18), a guide tube (19), and a sleeve (20). The retaining ring (18) is fitted on the strut (17). The lower end of the strut (17) is inserted into the through hole (10) of the upper sand box (1) near the casting port (8). The retaining ring (18) is set above the upper connecting ring (3). The upper end of the strut (17) is provided with a guide tube (19). One side of the guide tube (19) is connected to the upper end of the strut (17). The other end of the guide tube (19) extends downward toward the casting port (8). The guide tube (19) is provided with a sleeve (20). The sleeve (20) is fitted on the lower end of the guide tube (19) and is slidably connected with the guide tube (19). The side of the sleeve (20) is provided with a handle (22).

7. The large casting double-layer casting mold according to claim 6, characterized in that: The lower end of the sleeve (20) is provided with a longitudinally arranged heat-conducting pipe (21), the end of the sleeve (20) passes through the side of the heat-conducting pipe (21), and the lower end of the heat-conducting pipe (21) is correspondingly arranged with the casting port (8).

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