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Assembly method and working conditions of the sand core

1. Shan brush: also known as paint pen, paint brush, roller brush, and casting brush. It is mainly used to remove the parting sand on the pattern, apply paint to the surface of the cavity and the sand core, and is also used to moisten the sand at the edge of the pattern to facilitate mold lifting and repair. 2. Scraper: Also known as trowel, the most widely used tools in repairing are flat head, pointed head and round head. They are mainly used to repair the larger surface of molding sand (core), excavate pouring riser and cut Grooves and casting ribs, trimming of sand blanks and soft and hard sand beds, lifting the reinforcement nails on the surface of the sand mold into the sand mold, etc. 3. Pressure spoon: used to repair the small plane of the sand cavity, and to set up a pouring system. It has an arc-shaped surface at one end and a flat surface at the other end, and the inclination of the spoon handle is 30 degrees. Commonly used are standard pressure spoon, single flush pressure spoon and double flush pressure spoon. 4. Lifting hook: also known as sand hook and tie hook. Mainly used for repairing the deep and narrow bottom and side walls of the sand mold (core), extracting the sand scattered in the deep and narrow cavity. When using it, it is necessary to repair and lift the sand vertically to prevent the shape and size of the repaired surface and wall from being inaccurate or to damage the sand when lifting sand. A set of lifting hooks are divided into several types according to the width of the lifting head and the length of the lifting handle, which are selected according to the size and depth of the cavity part when repairing. 5. Bamboo stalks: also known as semi-circle, used to repair the vertical arc-shaped inner wall and its bottom surface. When using, hold the handle by hand and press the inner wall or bottom surface of the sand mold trimming part. 6. Autumn leaves: Both ends are spoon-shaped, used to trim the curved surface or narrow concave surface of the sand cavity. 7. Hammer hook: Also known as round head, it is used to trim round, arc-shaped grooves, flange surfaces, etc. 

It has a wide range of use. 8. Flange hook: also known as flange stem, used to repair the deep and narrow arc surface of the sand mold (core), the narrow sides of the flanges at both ends of the pipe castings, etc. 9. Forming trowel: The forming trowel is a group of trowels, including right-angle photons, egg-shaped photons, internal and external angles, etc. Its working face has various shapes, small volume and easy to use. It is mainly used for trimming the inner and outer rounded corners, square corners, round and arc-shaped surfaces of the smooth sand cavity. 10. Hand winder: also known as leather tiger, a common tool for hand styling. It is used to blow away the sand scattered in the cavity. Do not use excessive force or touch the sand mold during use to avoid damage to the sand mold. 11. Core brace: also known as mud core brace, cast card, brace, support iron, brace head, core clip, core top, cast roof, I-shaped card, I-shaped brace, cast nail. It is a metal component used to support the sand core or local sand mold during sand mold assembly. In the casting process, when the sand mold or sand core cannot maintain its correct position, the core support with a certain thickness and shape and surface treatment can be used to maintain the correct position of the sand mold or sand core in the cavity. The shape of the core support: the shape of the core support should be selected according to the shape, size, assembly method and working conditions of the sand core. The ends of the core braces are made into larger supporting surfaces. Double-pillar core braces are generally used to support larger sand cores, single-pillar core braces are used for medium-sized sand cores, small castings are cooled faster, and thin sheet core braces are commonly used. Wet molding sand generally uses single-sided core braces to support the core brace One end of the surface is attached to the sand core, and the other end is pressed against the harder support outside the cavity. Requirements for core brace: The core brace should be fused with the casting, and the core brace should be made of metal with the same composition as the casting. The surface of the core support should be clean, free of rust and oil stains, and subjected to anti-rust treatment, and the surface should be zinc or tin. 

The placement of the core support: the height of the double-sided core support is the wall thickness of the casting, that is, the distance between the cavity and the sand core. Although the wall thickness of the casting is specified on the drawing, bronze gear  in actual production, due to various reasons, it is often If there is a discrepancy, if the core brace needs to be set, the height should be the actual distance between the sand core and the sand mold; when the single-sided core brace is placed, when the sand core with a larger mass is placed in the wet mold sand, due to the strength and hardness of the wet mold sand Both are lower, and a core support with a larger contact surface needs to be selected to prevent the core support from being pressed into the molding sand. When using a single-sided core brace, one end of the core brace should rest on a hard support. The core brace must be placed firmly to prevent movement or fall. If there is a gap, it should be tightly plugged with a core brace sheet. The core brace should be plugged on the inner surface of the cavity. The supporting surface of the core brace should be in contact with the surface of the cavity or the sand core. It is more reliable to place the core brace on the inclined surface. There must be a sufficient number of core supports and they should be evenly distributed. The core stay cannot be put into the cavity prematurely to prevent water vapor from condensing on its surface and causing defects such as blowholes in the casting. 12. Air shovel: It is mainly used for deburring of casting sand and deburring of large, medium and small castings, shovel cutting of weld groove, correction of stone and concrete wall and brick wall opening work. 13. Tamping machine: powered by compressed air, it is suitable for tamping of sand castings of medium-sized castings, and can also be used for operations such as concrete and bricks.