Counterweight iron, also known as counterweight block, is a process in which metal is smelted into a liquid that meets certain requirements and poured into a mold. After cooling, solidification, and cleaning, a casting with a predetermined shape, size and performance is obtained. It is one of the basic processes of the modern machinery manufacturing industry. It is mainly used in the counterweight balance of loaders, marine, elevators, tractors and other mechanical equipment. Counterweight blocks and counterweight irons are used to increase their own weight to maintain balance. .

Technical parameters of counterweight iron and counterweight block:

1. There should be threaded holes or cylindrical holes for hoisting facilities such as installation handles and lifting rings on or on the opposite sides. When designing the hoisting position, consideration should be given to minimizing the changes caused by hoisting.

2. Material requirements: high-strength cast iron HT150-200.

3. The counterweight iron shall not have defects such as sand holes, pores, cracks, slag inclusions, shrinkage porosity, scratches, bumps, rust spots, etc., which seriously affect the appearance and performance.

4. Iron trachoma and stomata: The stomata trachoma can be filled with solids of the same material as the counterweight.

5. Sand cleaning and painting: The counterweight iron should be sanded, clean and sprayed with red anti-rust paint.

6. Resin sand is generally used for small counterweight irons, on the one hand to facilitate sand cleaning, and for the following reasons:

Heavy Industry Counterweight

The resin sand mold has good rigidity and high sand mold strength at the initial stage of pouring. It is conditional to use the graphitization expansion during the solidification process of cast iron to effectively eliminate shrinkage holes and shrinkage porosity defects, and realize less riser and no riser casting of gray cast iron and ductile iron.

In the production of solid mold casting, the polystyrene foam model is used to form the self-hardening sand of furosemide resin. When the molten metal is poured into the mold, the foamed plastic pattern is rapidly vaporized under the action of the high-temperature molten metal, burns and disappears. The molten metal replaces the position occupied by the original foamed plastic, and cools and solidifies into a solid casting with the same shape as the pattern.

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