Tool for casting high-grade iron casting by adopting resin sand and iron mold coated sand

Abstract

The utility model provides a tool for casting a high-grade iron casting by adopting resin sand and iron mold coated sand, which relates to the technical field of casting molds and comprises an upper sand box, a grid is fixedly connected to the top end of the upper sand box, a lower sand box is arranged below the upper sand box, heat dissipation holes are formed in the surface of the lower sand box, and the heat dissipation holes are communicated with the grid. Connecting lug plates are fixedly connected to the two sides of the upper sand box, through the arrangement of heat dissipation holes in the lower sand box, the heat dissipation effect of a casting in a resin sand mold is improved, cooling and curing of an iron solution can be accelerated, refining of an internal structure (forming of a globular body structure) in the cooling and curing process can be accelerated, and therefore the casting with the strength of HT300 or higher is obtained, and through the arrangement of the lower sand box, the heat dissipation effect of the casting in the resin sand mold is improved. The bottom plate with the thickness of 30mm can improve the rigidity and the strength of the lower mold, reduce deformation and ensure the dimensional accuracy and the shape stability of the casting, the thicker lower mold can better absorb and conduct heat, the cooling speed of the casting is favorably controlled, a casting system realizes a dead head-free design, the process yield is improved to 90%, and the cost is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of casting molds, in particular to a tooling for casting high-grade cast iron parts by using resin sand and iron mold covered sand. Background Art

[0002] Iron mold coated sand is an advanced material widely used in the foundry industry. It is characterized by high precision, excellent surface quality, high strength and good regeneration. These characteristics enable it to achieve high-precision molding of complex castings, provide a smooth surface, reduce the need for subsequent processing, and have high strength to withstand the impact of high-temperature molten metal, thereby reducing casting defects and being suitable for large-scale batch production. However, the process development cycle of iron mold coated sand is long and the mold cost is high. The reason is that the production process is complicated and requires high-quality resin and iron molds, as well as a single sand box, resulting in high material and manufacturing costs.

[0003] In comparison, resin sand is a relatively economical casting material. Due to its low production and use costs, it is suitable for large-scale production. Resin sand exhibits good fluidity and filling properties during the molding process and is adaptable to complex casting designs. However, existing resin sand also has some limitations, such as: it requires a large amount of sand, the iron-sand ratio is usually 1:3 to 1:4, the cost is also high, and the thermal conductivity is poor. The heat dissipation is slow during the cooling process, which makes it difficult to cast HT300 and higher grade products.

[0004] Therefore, we provide a tooling for casting high-grade iron castings using resin sand and iron mold covered sand to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a tool for casting high-grade iron castings by using resin sand and iron mold covered sand, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a tooling for casting high-grade cast iron parts using resin sand and iron mold covered sand, comprising an upper sand box, a grid is fixedly connected to the top of the upper sand box, a lower sand box is arranged below the upper sand box, heat dissipation holes are opened on the surface of the lower sand box, and connecting ear plates are fixedly connected to both sides of the upper sand box.

[0007] Preferably, the thickness of the lower sand box is 30 mm.

[0008] Preferably, connecting ear plates are fixedly connected to both sides of the upper sand box and the lower sand box and are arranged correspondingly.

[0009] Preferably, a template is provided at the bottom end of the upper sand box, a mold is provided at the top end of the template, a sprue is provided on the surface of the template, and a plurality of cross runners are provided on both sides of the sprue.

[0010] Preferably, the sprue and a plurality of runners penetrate each other, and each runner is connected to each mold.

[0011] Preferably, an upper sand mold is arranged between the upper sand box and the template, a pouring port is opened on the surface of the upper sand mold, a pouring cup is arranged at the top of the pouring port, and a lower sand mold is arranged on the surface of the lower sand box.

[0012] Preferably, both ends of the upper sand box and the lower sand box are fixedly connected with hooks.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The heat dissipation holes on the lower sand box are set to improve the heat dissipation effect of the casting in the resin sand mold, accelerate the cooling and solidification of the iron solution, and refine the internal structure during cooling and solidification (forming a spheroidal structure), so as to obtain HT300 or higher strength castings. Through the setting of the lower sand box, the 30mm bottom plate thickness can improve the rigidity and strength of the lower mold, reduce deformation, ensure the dimensional accuracy and shape stability of the casting, and reduce the resin sand laid, so that the sand-iron ratio is reduced to 1:1 to 1:2.5. The thicker lower mold can better absorb and conduct heat, which helps to control the cooling rate of the casting, thereby affecting the crystallization process and final mechanical properties of the casting, and enables the pouring system to achieve a riser-free design, increase the process yield to 90%, and further reduce costs.

[0015] 2. The connecting ear plate can fasten the upper sand box and the lower sand box together to prevent mold breakage during pouring. The sprue is the main channel for molten metal to enter the mold. It can control the flow rate of the metal and reduce bubbles in the molten metal, thereby improving the quality of the casting. The runner can be designed with different runners according to the shapes and sizes of different castings to improve the flexibility of the casting process. The sprue is responsible for introducing the molten metal into the mold, while the runner is responsible for evenly distributing the metal to various parts of the mold. The pouring port uses a sprue rod of appropriate size to occupy the position when filling the resin sand. The pouring cup is used during pouring to allow the molten iron to be smoothly injected into the cavity, thereby improving the pouring efficiency. The hook can facilitate workers to connect the upper sand box and the lower sand box to the lifting equipment for movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall appearance structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the upper sand box and template structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the upper sand box and upper sand mold structure when viewed from above of the utility model;

[0019] Figure 4 This is a schematic diagram of the lower sand box structure of the utility model;

[0020] Figure 5 It is a schematic diagram of the lower sand box and lower sand mold structure of the utility model;

[0021] Figure 6 It is a schematic diagram of the pouring port structure of the upper sand box of the utility model.

[0022] Numbers in the figure: 1. Upper sand box; 2. Grid; 3. Lower sand box; 4. Heat dissipation holes; 5. Connecting ear plates; 6. Template; 7. Mold; 8. Straight runner; 9. Horizontal runner; 10. Upper sand mold; 11. Pouring gate; 12. Pouring cup; 13. Lower sand mold; 14. Hook. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-6 As shown, the utility model provides a technical solution: a tool for casting high-grade iron castings by using resin sand and iron mold covered sand, comprising an upper sand box 1, a grid 2 is fixedly connected to the top of the upper sand box 1, a lower sand box 3 is arranged below the upper sand box 1, a heat dissipation hole 4 is opened on the surface of the lower sand box 3, and connecting ear plates 5 are fixedly connected to both sides of the upper sand box 1. The heat dissipation effect of the casting in the resin sand mold is improved through the heat dissipation holes 4, the cooling and solidification of the iron solution can be accelerated, and the internal structure is refined (spheroidal structure is formed) during cooling and solidification, so as to obtain HT300 or higher strength castings.

[0025] Furthermore, the thickness of the lower sand box 3 is 30 mm. Increasing the thickness of the bottom plate of the lower sand box 3 can improve the rigidity and strength of the lower mold, reduce deformation, ensure the dimensional accuracy and shape stability of the casting, and reduce the laid resin sand, so that the sand-iron ratio is reduced to 1:1 to 1:2.5. The thicker lower mold can better absorb and conduct heat, which helps to control the cooling rate of the casting, thereby affecting the crystallization process and final mechanical properties of the casting, and enables the casting system to achieve a riser-free design, thereby increasing the process yield to 90%, further reducing costs.

[0026] Furthermore, connecting ear plates 5 are fixedly connected to both sides of the upper sand box 1 and the lower sand box 3 and are arranged correspondingly, so that the upper sand box 1 and the lower sand box 3 can be fastened together to prevent mold breakage during pouring.

[0027] Furthermore, a template 6 is provided at the bottom end of the upper sand box 1, a mold 7 is provided at the top end of the template 6, a straight runner 8 is provided on the surface of the template 6, and a plurality of cross runners 9 are provided on both sides of the straight runner 8. The straight runner 8 is the main channel for the molten metal to enter the casting, which can control the flow rate of the metal and reduce the bubbles in the molten metal, thereby improving the quality of the casting. The cross runner 9 can be designed with different cross runners 9 according to different shapes and sizes of castings to improve the flexibility of the casting process.

[0028] Furthermore, the sprue 8 and a plurality of runners 9 interpenetrate each other, and each runner 9 is connected to each mold 7. The sprue 8 is responsible for introducing the molten metal into the mold, while the runner 9 is responsible for evenly distributing the metal to various parts of the mold.

[0029] Furthermore, an upper sand mold 10 is arranged between the upper sand box 1 and the template 6, a pouring gate 11 is opened on the surface of the upper sand mold 10, a pouring gate 11 is arranged on the top of the pouring gate 11, and a lower sand mold 13 is arranged on the surface of the lower sand box 3. The pouring gate 11 uses a straight pouring gate rod of a suitable size to occupy the position when filling the resin sand. The pouring cup 12 is used during pouring to enable the molten iron to be smoothly injected into the mold cavity, thereby improving the pouring efficiency.

[0030] Furthermore, hooks 14 are fixedly connected to both ends of the upper sand box 1 and the lower sand box 3, so that workers can connect the upper sand box 1 and the lower sand box 3 to the lifting equipment for movement.

[0031] Working principle: First, a tool for casting high-grade iron castings using resin sand and iron mold covered sand is moved to the working position. When in use, the first step is to move the upper sand box 1 to the template 6 through the hook 14, the second step is to put the straight gate rod into the grid 2, pour and fill the resin sand through the grid 2, and wait for 20 minutes for solidification, the third step is to fill the lower sand box 3 with resin sand and scrape it flat, and after solidification, the upper sand box 1 is moved to the lower sand box 3 and fastened by connecting the ear plate 5, the fourth step is to place the pouring cup 12 on the pouring gate 11 for pouring, and after the casting is cooled, the upper sand box 1 is separated and the blank is taken out, thus completing the use process of a tool for casting high-grade iron castings using resin sand and iron mold covered sand.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tool for casting high-grade iron castings using resin sand and iron mold covered sand, comprising an upper sand box (1), characterized in that: A grid (2) is fixedly connected to the top of the upper sand box (1), a lower sand box (3) is arranged below the upper sand box (1), a heat dissipation hole (4) is opened on the surface of the lower sand box (3), and connecting ear plates (5) are fixedly connected to both sides of the upper sand box (1).

2. A tool for casting high-grade iron castings using resin sand and iron mold covered sand according to claim 1, characterized in that: The thickness of the lower sand box (3) is 30 mm.

3. The tooling for casting high-grade iron castings using resin sand and iron mold covered sand according to claim 1, characterized in that: Connecting ear plates (5) are fixedly connected to both sides of the upper sand box (1) and the lower sand box (3) and are arranged correspondingly.

4. The tooling for casting high-grade iron castings using resin sand and iron mold covered sand according to claim 1, characterized in that: A template (6) is arranged at the bottom end of the upper sand box (1), a mold (7) is arranged at the top end of the template (6), a sprue (8) is arranged on the surface of the template (6), and a plurality of cross runners (9) are arranged on both sides of the sprue (8).

5. The tooling for casting high-grade iron castings using resin sand and iron mold covered sand according to claim 4, characterized in that: The sprue (8) and a plurality of runners (9) penetrate each other, and each runner (9) is connected to each mold (7).

6. The tooling for casting high-grade iron castings using resin sand and iron mold covered sand according to claim 1, characterized in that: An upper sand mold (10) is arranged between the upper sand box (1) and the template (6), a pouring port (11) is provided on the surface of the upper sand mold (10), a pouring cup (12) is provided at the top of the pouring port (11), and a lower sand mold (13) is provided on the surface of the lower sand box (3).

7. The tooling for casting high-grade iron castings using resin sand and iron mold covered sand according to claim 1, characterized in that: Both ends of the upper sand box (1) and the lower sand box (3) are fixedly connected with hooks (14).

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