Sand casting method for sand-coated chill

Abstract

The application discloses a sand-coated cold iron method for sand casting workbench surface forming and relates to the technical field of sand casting methods, and specifically comprises the following steps: S1, preparing coated sand; S2, molding N sand separating plates from the coated sand, wherein the front surface of the sand separating plate is flat and serves as a base surface, and the back surface serves as a first placing surface for placing cold iron; S3, placing the first placing surface of the sand separating plate upwards, and closely arranging the N sand separating plates in a rectangular array, so that the base surfaces are spliced to form a workbench surface; S4, designing and manufacturing cold iron that can be accommodated on the sand separating plate according to the size of the first placing surface; S5, placing the cold iron on the first placing surface of the sand separating plate in sequence; and S6, turning over all the sand separating plates to make the workbench surface formed by the spliced base surfaces face upwards. According to the application, the cold iron is uniformly arranged by being positioned and placed on the sand separating plate, the workbench surface formed by the sand separating plates has better integrity, the surface finish of the castings is better, the cold iron can be directly replaced, and the efficiency and practicability are improved.

Description

TECHNICAL FIELD

[0001] The application discloses a sand casting sand-coated cold iron method for forming a sand casting workbench surface, relates to the technical field of sand casting methods, and can be used for forming a flat bottom surface of a workbench casting and is equivalent to a bottom mold of a sand mold. BACKGROUND

[0002] Sand casting is a method for producing a casting by pouring molten iron into a sand mold and cooling it to form a casting. During the casting process, due to the structure and casting parameters, the solidification time of the molten iron at different points in the mold cavity is not equal, thus generating thermal stress and causing casting deformation, cracks and other defects. In addition, due to the unequal cooling and solidification time, the casting may also have defects such as porosity, cold shut and gas hole. Therefore, it is usually necessary to place cold iron in the sand mold to control the solidification direction and speed of the casting.

[0003] Cold iron is divided into two categories: internal cold iron and external cold iron. Internal cold iron is placed in the mold cavity and can be fused with the casting. External cold iron is placed on the surface of the sand mold during molding and is not fused with the casting. Sand-coated cold iron is a commonly used external cold iron and is suitable for controlling the solidification sequence of thick and solid medium and large gray iron and ductile iron castings.

[0004] The traditional sand-coated cold iron method is to lay the cold iron flat on a pre-placed base plate, then fill the sand to fill the gap between the cold iron, invert the base plate and remove the base plate, and then fill the sand again, finally compact and level the workbench surface. This method is difficult to control the placement distance of the cold iron, and after removing the base plate, new sand needs to be mixed and filled, which is greatly affected by human factors, and the tightness between the sand is not high, which is easy to form a sand defect. SUMMARY

[0005] To solve the technical problems in the background art, the application provides a sand casting sand-coated cold iron method and a use method.

[0006] A sand casting sand-coated cold iron method for forming a sand casting workbench surface, the workbench surface being used for forming a flat bottom surface of a workbench casting, comprising the following steps:

[0007] S1, preparing coated sand;

[0008] S2, molding N sand separating plates from the coated sand, the front surface of the sand separating plate being flat as a base surface, and the back surface being a first placement surface for placing cold iron;

[0009] S3, arranging the N sand separating plates in a rectangular array and closely arranging the first placement surfaces of the N sand separating plates with the base surfaces being connected to form a workbench surface;

[0010] S4, designing and manufacturing cold iron that can be accommodated on the sand separating plate according to the size of the first placement surface;

[0011] S5, placing the cold iron on the first placement surface of the sand separating plate in sequence;

[0012] S6, turning over all the sand separating plates to make the workbench surface formed by the base surface face upward.

[0013] As a further optimization of the above scheme, the edge of each side of the first placement surface is provided with a baffle perpendicular to the sand separating plate, and the baffles are combined to form a cavity capable of accommodating the cold iron.

[0014] As a further optimization of the above scheme, the middle part of the baffle on each side has a vertical cut, and the cuts of the baffles on the opposite sides are symmetrical to each other.

[0015] As a further optimization of the above scheme, the closer to the first placement surface along the direction perpendicular to the sand separating plate, the larger the distance between the cuts.

[0016] As a further optimization of the above scheme, the sand separating plate and the baffle are integrally formed.

[0017] 1. The sand separating plate and the cold iron in the sand casting sand-coated cold iron method correspond one-to-one, and the cold iron is quickly positioned and installed through the baffle on the sand separating plate, the spacing of the cold iron is accurately controlled, and the cooling demand of the casting is met.

[0018] 2. The base surface of the prefabricated sand separating plate in the sand casting sand-coated cold iron method can directly form a workbench surface, compared with the traditional method, it does not need to fill sand, and naturally does not need to fill sand and level after removing the backing plate, so that the integrity of the workbench surface is better, the strength is higher, and the surface finish of the cast casting is better.

[0019] 3. The sand separating plate in the sand casting sand-coated cold iron method can be directly replaced even if the surface of a part of the sand separating plate is damaged during pouring, without the need for sand mixing and filling, improving efficiency and practicality. DETAILED DESCRIPTION

[0020] Figure 1 The first angle structure diagram of the sand separating plate of the sand casting sand-coated cold iron method proposed by the application;

[0021] Figure 2 The second angle structure diagram of the sand separating plate of the sand casting sand-coated cold iron method proposed by the application;

[0022] Figure 3 The arrangement mode diagram of the sand separating plate of the sand casting sand-coated cold iron method proposed by the application. DETAILED DESCRIPTION

[0023] The sand casting sand-coated cold iron method provided by the embodiment is used for forming a workbench surface of a sand casting workbench, the workbench surface is used for forming a flat bottom surface of a workbench casting, is equivalent to a bottom mold part of a sand mold, and specifically comprises the following steps.

[0024] S1, preparing coated sand;

[0025] S2, molding N sand separating plates 1 from the coated sand, the front surface of the sand separating plate 1 is flat and used as a base surface 11, and the back surface is used as a first placing surface 12 to place cold iron;

[0026] S3, the first placing surface 12 of the sand separating plate 1 faces upwards, and the N sand separating plates 1 are closely arranged in a rectangular array, so that the base surfaces 11 are spliced to form a workbench surface;

[0027] S4, cold iron is designed and manufactured according to the size of the first placing surface 12 and can be accommodated on the sand separating plate 1;

[0028] S5, the cold iron is placed on the first placing surface 12 of the sand separating plate 1 in sequence;

[0029] S6, all the sand separating plates 1 are turned over as a whole, so that the workbench surface formed by the spliced base surfaces 11 faces upwards.

[0030] The structure of the sand separating plate 1 mentioned in S2 can refer to Figure 1 and Figure 2 , the arrangement mode can refer to Figure 3 , and the cold iron is matched with the sand separating plate 1 to position the cold iron, and the cold iron can also be guided out of heat by the workbench surface formed by the base surfaces 11.

[0031] The edge of each side of the first placing surface 12 is provided with a baffle 2 perpendicular to the sand separating plate 1, the baffles 2 are combined to form a cavity capable of accommodating the cold iron, so that the cold iron cannot be deviated after being placed, and the cold iron can be placed according to the arrangement of the sand separating plate 1 to ensure uniform arrangement.

[0032] The sand separating plate 1 and the baffle 2 are integrally formed.

[0033] In addition, the middle part of the baffle 2 on each side edge is provided with a vertical fracture 3, the fractures 3 of the baffles 2 on the opposite side edges are symmetrical to each other, the distance between the fractures 3 is larger along the direction perpendicular to the sand separating plate 1 and closer to the first placing surface 12, the fracture 3 has the following effects: one is that the amount of sand can be saved, because the position of the cold iron can be limited by limiting the four corners of the cold iron, and the other is that the trapezoidal fracture 3 is equivalent to a bevel, which can avoid dislocation and separation between the sand separating plates 1 during subsequent turning over.

[0034] The sand separating plate 1 can make the cold iron be arranged uniformly quickly and accurately, meets the cooling needs of the casting, and the base surface 11 of the prefabricated sand separating plate 1 can directly form a workbench surface, sand filling is not needed, and there is no secondary sand filling and leveling after the base plate is removed, so that the integrity of the workbench surface is better, the strength is higher, and therefore the surface finish of the cast casting is better. In addition, even if the surface of the sand separating plate 1 is damaged in the pouring process, it can be directly replaced without mixing sand and filling, thereby improving the efficiency and practicality.

[0035] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for sand casting with a sand-coated chill, used for forming a sand casting worktable surface, wherein the worktable surface is used to shape the flat bottom surface of the worktable casting, characterized in that, Includes the following steps: S1. Preparation of coated sand; S2. N sand partition plates (1) are made by molding coated sand. The front of the sand partition plate (1) is flat as the base surface (11), and the back is the first placement surface (12) for placing chills. S3. The first placement surface (12) of the sand partition (1) faces upward, and N sand partitions (1) are arranged in a rectangular array and closely arranged so that the base surface (11) is spliced ​​together to form a workbench surface; S4. Based on the dimensions of the first placement surface (12), a chill that can be adapted to be accommodated on the sand-blocking plate (1) is designed and manufactured; S5. Place the chills sequentially onto the first placement surface (12) of the sand-separating plate (1); S6. Flip all the sand-blocking plates (1) so that the workbench surface formed by splicing the base surface (11) faces upward.

2. The sand casting method for sand-coated chills according to claim 1, characterized in that, Each side edge of the first placement surface (12) is provided with a baffle (2) perpendicular to the sand-blocking plate (1), and the baffle (2) together form a cavity that can accommodate the chilled iron.

3. The sand casting method for sand-coated chills according to claim 2, characterized in that, Each side panel (2) has a vertically opened break (3) in the middle, and the breaks (3) of the side panels (2) are symmetrical to each other.

4. The sand casting method for sand-coated chills according to claim 3, characterized in that, The closer to the first placement surface (12) along the direction perpendicular to the sand-blocking plate (1), the larger the spacing of the fractures (3).

5. The sand casting method for sand-coated chills according to claim 4, characterized in that, The sand-blocking plate (1) and the baffle plate (2) are integrally formed.

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