Pouring method for eliminating bubbles of casting

Abstract

The invention relates to the technical field of castings, in particular to a pouring method for eliminating bubbles of a casting. The method comprises the following steps: S1, putting a pouring foam type master mold made of foam into a sand box; s2, a plurality of exhaust ports are formed in the sand box, and then the sand box is heated to 50-60 DEG C; s3, part molten iron is poured through a pouring opening in the foam type master mold, and at the moment, the foam type master mold can be rapidly gasified and discharged at the high temperature of the molten iron; s4, the sand box is placed in air, a fan is arranged above the sand box, and gas in the sand box is eliminated and loosened in a positive pressure mode; and S5, after the sand box is cooled, sand is removed, and the formed mold is taken out. According to the prepared casting part, bubbles involved in molten iron of the part and bubbles generated in the gasification process of the foam type master mold can be smoothly discharged out of a casting cavity, so that the interior of the casting part is solid, the casting time is short, the casting quality is improved, and waste products are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of castings, and in particular to a pouring method for eliminating bubbles in castings. Background Art

[0002] Casting is a process of melting metal into liquid that meets certain requirements and pouring it into a mold. After cooling, solidification and cleaning, a casting with a predetermined shape, size and performance is obtained. The casting blank is almost formed, so it can be machined or processed in small amounts, which reduces costs and reduces production time to a certain extent.

[0003] Currently in the casting process, when the molten iron of the parts added to the casting mold is poured, its inner wall may be mixed with some bubbles, resulting in the molten iron after the subsequent molding. At this time, the bubbles cannot be completely discharged from the molten iron, resulting in the existence of pores in the molded parts, affecting their quality. In order to reduce the casting cost, some foam-type original molds are used as molds. This causes the foam to vaporize when it encounters high temperature, and bubbles will remain in the parts at this time, further affecting their quality. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a casting method for eliminating bubbles in castings.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A casting method for eliminating bubbles in castings comprises the following steps:

[0007] S1, placing the original mold of the pouring foam type made of foam into the sand box;

[0008] S2. Multiple exhaust ports are provided on the sand box, and then the sand box is heated to 50-60°C;

[0009] S3, pouring the molten iron of the parts through the pouring port on the foam-type original mold, at this time the foam-type original mold will be quickly gasified and discharged under the high temperature of the molten iron;

[0010] S4. Place the sand box in the air and set a fan above the sand box to eliminate and loosen the gas inside the sand box by positive pressure;

[0011] S5. After the sand box is cooled, remove the sand and take out the formed mold.

[0012] Preferably, in step S1, the sand box comprises the following components in weight: 70% Ningbo sand, 20% insulation sand and 10% old sand.

[0013] Preferably, in the step S3, a material guide is provided at the pouring port, and the material guide penetrates the pouring port and is connected to an inlet of the foam mold.

[0014] Preferably, in step S3, the pouring temperature of the molten iron for the parts is 1400-1500° C., and the pouring time of the molten iron for the parts is 40-50 seconds.

[0015] The present invention has the following beneficial effects:

[0016] The casting parts prepared by the present invention can smoothly discharge the bubbles involved in the molten iron of the parts and the bubbles generated during the gasification of the foam type original mold from the casting cavity, so that the inside of the casting parts is solid, the casting time is short, the quality of the castings is improved, and the generation of waste products is reduced. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation of the present invention is described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0018] A casting method for eliminating bubbles in castings comprises the following steps:

[0019] S1, placing the original mold of the pouring foam type made of foam into the sand box;

[0020] S2. Multiple exhaust ports are provided on the sand box, and then the sand box is heated to 50-60°C;

[0021] S3, pouring the molten iron of the parts through the pouring port on the foam-type original mold, at this time the foam-type original mold will be quickly gasified and discharged under the high temperature of the molten iron;

[0022] S4. Place the sand box in the air and set a fan above the sand box to eliminate and loosen the gas inside the sand box by positive pressure;

[0023] S5. After the sand box is cooled, remove the sand and take out the formed mold.

[0024] In step S1, the sand box includes the following components in weight: 70% Ningbo sand, 20% insulation sand and 10% old sand.

[0025] In step S3, a material guide is provided at the pouring port, and the material guide passes through the pouring port and is connected to an inlet of the foam mold.

[0026] In step S3, the pouring temperature of the molten iron for the parts is 1400-1500°C, and the pouring time of the molten iron for the parts is 40-50S.

[0027] The casting parts prepared by the present invention can smoothly discharge the bubbles involved in the molten iron of the parts and the bubbles generated during the gasification of the foam type original mold from the casting cavity, so that the inside of the casting parts is solid, the casting time is short, the quality of the castings is improved, and the generation of waste products is reduced.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A casting method for eliminating bubbles in castings, characterized in that: The method comprises the following steps: S1, placing the original mold of the pouring foam type made of foam into the sand box; S2. Multiple exhaust ports are provided on the sand box, and then the sand box is heated to 50-60°C; S3, pouring the molten iron of the parts through the pouring port on the foam-type original mold, at this time the foam-type original mold will be quickly gasified and discharged under the high temperature of the molten iron; S4. Place the sand box in the air and set a fan above the sand box to eliminate and loosen the gas inside the sand box by positive pressure; S5. After the sand box is cooled, remove the sand and take out the formed mold.

2. A pouring method for eliminating bubbles in castings according to claim 1, characterized in that: In the step S1, the sand box includes the following components in weight: 70% Ningbo sand, 20% insulation sand and 10% old sand.

3. A pouring method for eliminating bubbles in castings according to claim 1, characterized in that: In step S3, a material guide is provided at the pouring port, and the material guide penetrates the pouring port and is connected to an inlet of the foam mold.

4. A pouring method for eliminating bubbles in castings according to claim 1, characterized in that: In step S3, the pouring temperature of the molten iron for the parts is 1400-1500° C., and the pouring time of the molten iron for the parts is 40-50 seconds.