Sand core mold for casting assembled aircraft fuel tank

Abstract

The utility model discloses a sand core mold for casting an assembled airplane fuel tank, relates to the technical field of sand core molds, and aims to solve the problems that a traditional airplane fuel tank sand core mold in the prior art is often complex in design and generally adopts an integrated structure, so that the use flexibility of the sand core mold is limited. An upper outer core body is arranged in the upper mold box and comprises an upper sand core middle block and an upper sand core edge block, and a lower outer core body is arranged in the lower mold box and comprises a lower sand core middle block and a lower sand core edge block. An inner core body is arranged in the upper outer core body and the lower outer core body, the inner core body comprises a core body middle block and a core body edge block, and the upper outer core body and the lower outer core body are closed to form a forming cavity with the inner core body.

Description

Technical Field

[0001] The utility model relates to the technical field of sand core moulds, in particular to an assembled sand core mould for casting aircraft fuel tanks. Background Art

[0002] Aircraft fuel tanks are containers used to store fuel on aircraft. They are designed to ensure that the aircraft can safely and effectively store and use fuel during flight. The shell of an aircraft fuel tank is generally made of aluminum alloy, which can meet the molding, structural strength and hardness requirements of the complex internal structure of the tank. Aluminum alloy aircraft fuel tanks are cast in a self-hardening sand mold to ensure one-time molding. Sand core molds are required when casting aircraft fuel tanks.

[0003] For example, the authorized patent with publication number CN217315733U (a sand core mold): includes: a fixed plate, an outer mold box and an inner mold box, the number of each of the outer mold box and the inner mold box is two, the two outer mold boxes and the inner mold box are symmetrically arranged with the central vertical plane passing through the fixed plate as the symmetry plane, and the two inner mold boxes are slidably connected to the inner wall of the outer mold box;

[0004] Although the above-mentioned existing technology facilitates the demolding plate to press against the sand core, fix the position of the sand core, and separate the inner mold box from the surface of the sand core, which facilitates the demolding of the sand core, traditional aircraft fuel tank sand core molds are often complex in design and usually adopt an integrated structure, which limits the flexibility of the use of the sand core mold; therefore, the market urgently needs to develop an assembled sand core mold for aircraft fuel tank casting to help people solve the existing problems. Utility Model Content

[0005] The purpose of the present utility model is to provide an assembled sand core mold for casting aircraft fuel tanks, so as to solve the problem proposed in the above background technology that traditional aircraft fuel tank sand core molds are often complex in design and usually adopt an integrated structure, which limits the flexibility of the sand core mold.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sand core mold for casting an assembled aircraft fuel tank, comprising an upper mold box and a lower mold box, an upper outer core body is arranged inside the upper mold box, and the upper outer core body includes an upper sand core middle block and an upper sand core edge block, a lower outer core body is arranged inside the lower mold box, and the lower outer core body includes a lower sand core middle block and a lower sand core edge block, an inner core body is arranged inside the upper outer core body and the lower outer core body, and the inner core body includes a core middle block and a core edge block, and the upper outer core body and the lower outer core body are closed to form a molding cavity with the inner core body.

[0007] Preferably, a connecting slot is provided on one side of the lower sand core middle block, and a connecting protrusion is provided on the other side of the lower sand core middle block, and the lower sand core middle block and the connecting protrusion are set as an integrated structure, the cross-sectional shape of the connecting slot is set to a trapezoid, and the cross-sectional shape of the connecting protrusion is set to a trapezoid.

[0008] Preferably, a connecting slot 2 is provided on one side of the core middle block, a connecting protrusion 2 is provided on the other side of the core middle block, and the core middle block and the connecting protrusion 2 are set as an integral structure, a reinforcing rib is provided inside the connecting protrusion 2, and the reinforcing rib extends to the inside of the core middle block, the cross-sectional shape of the connecting slot 2 is set to a trapezoid, and the cross-sectional shape of the connecting protrusion 2 is set to a trapezoid.

[0009] Preferably, a cavity is provided inside the inner core body, a core head is fixedly installed above the middle block of the core body in the middle position, the upper end of the core head is fixedly connected to the upper mold box, and pouring gates are provided inside the upper sand core edge blocks at both ends of the upper outer core body.

[0010] Preferably, the upper mold box and the lower mold box have the same structure, and the lower mold box includes a mounting plate, a side plate and an adjustment plate. There are two side plates, and the two side plates are symmetrically fixedly installed at the front end and the rear end above the mounting plate. There are two adjustment plates, and the two adjustment plates are symmetrically arranged on both sides between the two side plates.

[0011] Preferably, a strip slot is provided inside the side plate, and a fixing bolt is provided on the side of the side plate away from the adjustment plate, and the screw end of the fixing bolt passes through the strip slot and is threadedly connected to the adjustment plate.

[0012] Preferably, convex plates are symmetrically fixedly installed at both ends of the outer sides of the two side panels, and bolt holes are provided inside the convex plates.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The utility model adopts a modular design to divide the upper mold box, the lower mold box, and the internal upper outer core body, the lower outer core body and the inner core body into intermediate blocks and side blocks, thereby realizing an internal assembly structure of the sand core mold. This arrangement not only reduces the complexity of the mold, but also enables the sand core mold to flexibly adjust its length according to the actual needs of aircraft fuel tank casting by freely combining different numbers of intermediate blocks, thereby greatly enhancing the flexibility and adaptability of the mold. Compared with the traditional one-piece sand core mold, this assembly structure is more suitable for the manufacture of large thin-walled castings and can better meet the molding requirements of the complex internal structure of the aircraft fuel tank.

[0015] 2. The utility model can further reduce the weight of the mold by providing a cavity inside the inner core body, and by providing an exhaust hole inside the core head, the exhaust hole is connected to the molding cavity and the external air, so that when the aircraft fuel tank is cast, the air in the molding cavity is easily discharged, thereby reducing the occurrence of casting defects such as lack of meat and air holes in large thin-walled castings of aircraft fuel tanks.

[0016] 3. The utility model provides pouring ports inside the upper sand core side blocks at both ends of the upper outer core body, thereby facilitating the injection of molten aluminum liquid as the raw material of the aircraft fuel tank. Furthermore, by providing pouring ports on both sides, pouring can be performed simultaneously from both sides, thereby increasing the pouring and filling speed, and facilitating the complete and sufficient filling of the molding cavity with aluminum liquid. This not only improves the casting efficiency, but also facilitates the uniformity and stability of the wall thickness of the large thin-walled casting of the aircraft fuel tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a sand core mold for casting an assembled aircraft fuel tank according to the present invention;

[0018] Figure 2 This is a cross-sectional view of a sand core mold for casting an assembled aircraft fuel tank according to the present invention;

[0019] Figure 3 This is a schematic structural diagram of the lower sand core middle block of the utility model;

[0020] Figure 4 This is a cross-sectional view of the middle block of the lower sand core of the present invention;

[0021] Figure 5 This is a schematic diagram of the assembly of the core middle block of the present invention;

[0022] Figure 6 It is a structural schematic diagram of the lower mold box of the present utility model.

[0023] In the figure: 1. Upper mold box; 2. Lower mold box; 201. Mounting plate; 202. Side plate; 2021. Strip slot; 203. Adjustment plate; 3. Upper outer core; 301. Upper sand core middle block; 302. Upper sand core side block; 4. Lower outer core; 401. Lower sand core middle block; 4011. Connecting slot one; 4012. Connecting protrusion one; 402. Lower sand core side block; 5. Core head; 6. Inner core; 601. Core middle block; 6011. Connecting slot two; 6012. Connecting protrusion two; 602. Core side block; 7. Molding cavity; 8. Reinforcement rib; 9. Fixing bolt; 10. Protruding plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] See also Figure 1-6 , the utility model provides an embodiment: an assembled sand core mold for casting an aircraft fuel tank, comprising an upper mold box 1 and a lower mold box 2, an upper outer core 3 is arranged inside the upper mold box 1, the upper outer core 3 includes an upper sand core middle block 301 and an upper sand core side block 302, a plurality of upper sand core middle blocks 301 are provided, two upper sand core side blocks 302 are provided and are respectively located at the two ends of the upper outer core 3, a lower mold box 2 is provided inside the lower outer core 4, the lower outer core 4 includes a lower sand core middle block 401 and The lower sand core edge block 402 and the lower sand core middle block 401 are provided in plurality, two lower sand core edge blocks 402 are provided and are respectively located at the two ends of the lower outer core 4, an inner core 6 is provided inside the upper outer core 3 and the lower outer core 4, the inner core 6 includes a core middle block 601 and a core edge block 602, a plurality of core middle blocks 601 are provided, two core edge blocks 602 are provided and are respectively located at the two ends of the inner core 6, and a molding cavity 7 is formed between the upper outer core 3 and the lower outer core 4 and the inner core 6.

[0026] When in use, an internal assembly structure of the sand core mold is realized. By modularizing different parts and making the sand core molds of different parts separately and then assembling them, the complexity is reduced compared to the one-piece sand core mold. By setting multiple upper sand core middle blocks 301, lower sand core middle blocks 401 and core body middle blocks 601, the free combination capability of the sand core mold is realized. When casting an aircraft fuel tank, sand core molds of different lengths can be freely assembled with modules according to the required length, thereby increasing the flexibility of the sand core mold. Compared with the traditional one-piece sand core mold, this assembly structure is more suitable for the manufacture of large thin-walled castings and can better meet the molding requirements of the complex structure inside the fuel tank.

[0027] Furthermore, a connecting slot 4011 is provided on one side of the lower sand core middle block 401, and a connecting protrusion 4012 is provided on the other side of the lower sand core middle block 401, and the lower sand core middle block 401 and the connecting protrusion 4012 are set as an integral structure, the cross-sectional shape of the connecting slot 4011 is set as a trapezoid, and the cross-sectional shape of the connecting protrusion 4012 is set as a trapezoid, and the lower sand core side block 402 is also provided with a connecting slot 1 and a connecting protrusion 1, and the lower sand core middle block 401 and the lower sand core side block 402 are also The modules are connected by connecting slot 1 and connecting protrusion 1, and the upper sand core middle block 301 and the upper sand core side block 302 have the same structure as the lower sand core middle block 401 and the lower sand core side block 402 respectively. The setting of connecting slot 1 4011 and connecting protrusion 1 4012 realizes a stable connection between the modules. The setting of the trapezoidal cross-section not only enhances the firmness of the connection, but also enables the modules to automatically adjust their positions during assembly, ensuring a close fit between the modules and improving the overall stability and precision of the sand core mold.

[0028] Furthermore, a second connecting slot 6011 is provided on one side of the core middle block 601, and a second connecting protrusion 6012 is provided on the other side of the core middle block 601, and the core middle block 601 and the second connecting protrusion 6012 are set as an integral structure, and a second connecting slot and a second connecting protrusion are also provided on the core side block 602, and the core middle block 601 and the core side block 602 are also connected by connecting slots and connecting protrusions. A reinforcing rib 8 is provided inside the second connecting protrusion 6012, and the reinforcing rib 8 extends to Inside the core middle block 601, the cross-sectional shape of the connecting slot 2 6011 is set to a trapezoid, and the cross-sectional shape of the connecting protrusion 2 6012 is set to a trapezoid. The core middle block 601 also achieves a stable connection between modules through the setting of the connecting slot 2 6011 and the connecting protrusion 2 6012. The setting of the reinforcing rib 8 improves the structural stability of the inner core 6 combination, improves the bearing capacity of the mold, and enables the mold to better resist the occurrence of defects such as deformation and cracking during the casting process, thereby improving the quality of the casting.

[0029] Furthermore, a cavity is provided inside the inner core body 6, which can further reduce the weight of the mold. A core head 5 is fixedly installed above the middle block 601 of the core body in the middle position. The upper end of the core head 5 is fixedly connected to the upper mold box 1. An exhaust hole is provided inside the core head 5. The exhaust hole is connected to the molding cavity 7 and the external air, so that when the aircraft fuel tank is cast, the air in the molding cavity 7 is convenient to be discharged, so that large thin-walled castings can reduce the occurrence of casting defects such as lack of meat and air holes. The upper sand core edge blocks 302 at both ends of the upper outer core body 3 are provided with pouring gates. The setting of the pouring gates facilitates the injection of the raw material molten aluminum liquid of the aircraft fuel tank, and by setting pouring gates on both sides, pouring can be carried out synchronously from both sides, which increases the pouring and filling speed, and is conducive to the complete and sufficient filling of the molding cavity 7 by the aluminum liquid, which not only improves the casting efficiency, but also is conducive to the uniform and stable molding wall thickness of large thin-walled castings of aircraft fuel tanks, thereby increasing practicality.

[0030] Furthermore, the upper mold box 1 and the lower mold box 2 have the same structure. The lower mold box 2 includes a mounting plate 201, a side plate 202 and an adjustment plate 203. There are two side plates 202, and the two side plates 202 are symmetrically fixedly installed at the front and rear ends above the mounting plate 201. There are two adjustment plates 203, and the two adjustment plates 203 are symmetrically arranged on both sides between the two side plates 202. The upper mold box 1 and the lower mold box 2 adopt the same structural design, which is convenient for the manufacture and assembly of the mold. The setting of the adjustment plate 203 allows the mold to adjust its size and shape according to actual needs, thereby improving the flexibility and adaptability of the mold, so that the mold can maintain high precision and stability when manufacturing oil tanks of different sizes and shapes.

[0031] Furthermore, a strip slot 2021 is provided inside the side panel 202, and a fixing bolt 9 is provided on the side of the side panel 202 away from the adjusting plate 203. The screw end of the fixing bolt 9 passes through the strip slot 2021 and is threadedly connected to the adjusting plate 203. The setting of the strip slot 2021 and the fixing bolt 9 makes the adjustment and disassembly of the mold easier and more flexible.

[0032] Furthermore, convex plates 10 are symmetrically fixedly installed at both ends of the outer sides of the two side panels 202, and bolt holes are provided inside the convex plates 10, which facilitate the stable connection of the upper mold box 1 and the lower mold box 2 by bolts when casting the aircraft fuel tank, thereby increasing the stability of the casting process.

[0033] Working principle: When in use, the sand core mold is divided into an upper mold box 1 and a lower mold box 2 through a modular design. The upper mold box 1 contains an upper outer core body 3, and the lower mold box 2 contains a lower outer core body 4. These modules are composed of multiple intermediate blocks and side blocks, which can be freely combined to adjust the mold length as needed. The inner core body 6 is arranged inside the upper outer core body 3 and the lower outer core body 4, and is also modularly composed of a core intermediate block 601 and a core side block 602, and is stably connected through connecting slots and connecting protrusions. A cavity is provided inside the inner core body 6 to reduce weight, and an exhaust hole is provided on the core head 5 to discharge the air in the molding cavity 7 during pouring, thereby reducing casting defects. During casting, the aluminum liquid is injected into the molding cavity through the pouring port on the upper sand core side block 302. The simultaneous pouring on both sides increases the filling speed, ensures the uniformity and stability of the wall thickness of the casting, thereby improving the casting quality and production efficiency.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A sand core mold for casting an assembled aircraft fuel tank, comprising an upper mold box (1) and a lower mold box (2), characterized in that: An upper outer core (3) is provided inside the upper mold box (1), and the upper outer core (3) includes an upper sand core middle block (301) and an upper sand core side block (302); a lower outer core (4) is provided inside the lower mold box (2), and the lower outer core (4) includes a lower sand core middle block (401) and a lower sand core side block (402); an inner core (6) is provided inside the upper outer core (3) and the lower outer core (4), and the inner core (6) includes a core middle block (601) and a core side block (602); and a molding cavity (7) is formed between the upper outer core (3) and the lower outer core (4) when closed and the inner core (6).

2. The sand core mold for casting an assembled aircraft fuel tank according to claim 1, characterized in that: A connecting slot 1 (4011) is provided on one side of the lower sand core middle block (401), and a connecting protrusion 1 (4012) is provided on the other side of the lower sand core middle block (401), and the lower sand core middle block (401) and the connecting protrusion 1 (4012) are provided as an integral structure, the cross-sectional shape of the connecting slot 1 (4011) is provided as a trapezoid, and the cross-sectional shape of the connecting protrusion 1 (4012) is provided as a trapezoid.

3. The sand core mold for casting an assembled aircraft fuel tank according to claim 1, characterized in that: A second connecting slot (6011) is provided on one side of the core middle block (601), and a second connecting protrusion (6012) is provided on the other side of the core middle block (601), and the core middle block (601) and the second connecting protrusion (6012) are provided as an integral structure, a reinforcing rib (8) is provided inside the second connecting protrusion (6012), and the reinforcing rib (8) extends to the inside of the core middle block (601), the cross-sectional shape of the second connecting slot (6011) is set to be trapezoidal, and the cross-sectional shape of the second connecting protrusion (6012) is set to be trapezoidal.

4. The sand core mold for casting an assembled aircraft fuel tank according to claim 1, characterized in that: A cavity is provided inside the inner core (6), a core head (5) is fixedly installed above the core middle block (601) in the middle position, the upper end of the core head (5) is fixedly connected to the upper mold box (1), and pouring ports are provided inside the upper sand core edge blocks (302) at both ends of the upper outer core (3).

5. The sand core mold for casting an assembled aircraft fuel tank according to claim 1, characterized in that: The upper mold box (1) and the lower mold box (2) have the same structure. The lower mold box (2) comprises a mounting plate (201), a side plate (202) and an adjustment plate (203). Two side plates (202) are provided, and the two side plates (202) are symmetrically fixedly installed at the front end and the rear end above the mounting plate (201). Two adjustment plates (203) are provided, and the two adjustment plates (203) are symmetrically arranged on both sides between the two side plates (202).

6. The sand core mold for casting an assembled aircraft fuel tank according to claim 5, characterized in that: A strip-shaped slot hole (2021) is provided inside the side plate (202), and a fixing bolt (9) is provided on the side of the side plate (202) away from the adjustment plate (203), and the screw end of the fixing bolt (9) passes through the strip-shaped slot hole (2021) and is threadedly connected to the adjustment plate (203).

7. The sand core mold for casting an assembled aircraft fuel tank according to claim 6, characterized in that: The two ends of the outer sides of the two side plates (202) are respectively and symmetrically fixedly mounted with convex plates (10), and bolt holes are provided inside the convex plates (10).

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