Pump and valve fittings are used as basic structural components and are widely used in the pump and valve industries. At present, a large part of various pump and valve accessories on the market is manufactured by casting and belongs to castings. In fact, the cast iron material is an outer shell of water pumps and valves, and its proportion in similar products has exceeded 60%.
Next, we mainly analyze the technical characteristics of the casting structure of these pump valve fittings. According to some characteristics of the metal casting process, in order to ensure the quality of castings, simplify the metal structure, give full play to its technical and economic benefits, first of all must analyze the casting structure, and develop a reasonable casting process. Moreover, the quality of the metal casting structure is a prerequisite for guaranteeing the quality of castings and giving full play to the advantages of metal casting.
For this type of pump and valve accessories, if you want to obtain a reasonable casting structure, then you should follow these basic principles: 1, the casting structure should not obstruct the type, prevent contraction; 2, the difference in thickness can not be too large, In order to avoid disparities in the temperature of each part, resulting in shrinkage and shrinkage of the casting; 3, to limit the minimum thickness of metal castings. In addition, it is necessary to pay attention to the proper control of the precision and finish of the non-machined surface of the casting.
It should be noted that in the casting process, it is also necessary to pay attention to controlling the pouring position of the pump valve fitting casting in the metal type. This is because the casting position of the casting directly relates to the number of cores and parting surfaces, the introduction position of the liquid metal, the feeding effect of the riser, the degree of patency of the exhaust gas, and the complexity of the metal type. When selecting the pouring position, first of all, it is necessary to ensure that the flow of the molten metal during filling is stable, and the exhaust is convenient, so that the gas flow and the metal are prevented from being oxidized.
In addition, the structural design should be optimized as much as possible to ensure that the obtained pump valve parts can have a fine structure, and the number of cores should be reduced as much as possible, the placement is convenient, stable, and easy to produce. When designing the pump valve fitting structure, it is recommended that surface subdivision should be avoided as much as possible, which helps to reduce the number of disassembled parts and live blocks.http://www.pump-casting.com/