Talking about the Factors Influencing the Quality of Boiler Fittings

Boiler accessories are very common cast iron products in the casting process. It is worth paying attention to its quality issues, so the quality of boiler accessories is very important, so what are the specific influencing factors:

1. For the casting process operation of boiler parts, it is necessary to formulate reasonable process operation procedures, improve the technical level of workers, and make the process regulations be implemented correctly. During the manufacturing process, the quality of boiler accessories must be controlled and inspected. First, we must formulate the process rules and technical conditions from raw materials and auxiliary materials to the control and inspection of each specific product. Each process is strictly controlled and inspected in accordance with the process rules and technical conditions. Finally, the quality inspection of finished boiler parts castings is carried out. To be equipped with reasonable testing methods and appropriate testing personnel.

2. There must be a reasonable casting process. That is, according to the structure, weight and size of the cast iron, the characteristics of the cast alloy and the production conditions, select the appropriate parting surface, shape, and core making method, and reasonably set the casting rib, cold iron, riser and gating system. In order to ensure the acquisition of high-quality boiler parts and cast iron parts.

3. The quality of the raw materials used in the casting of boiler parts. The quality of metal charge, refractory materials, fuels, fluxes, modifiers and foundry sand, sand binders, coatings and other materials are substandard, which will cause pores, pinholes, slag inclusions, sand sticking and other defects in iron castings, which will affect boiler accessories The appearance quality and internal quality of iron castings will cause boiler parts to be scrapped in serious cases.

4. Design craftsmanship of boiler accessories. When designing, in addition to determining the geometric shape and size of the iron castings according to the working conditions and the properties of the metal materials, the rationality of the design must also be considered from the perspective of the casting alloy and the casting process characteristics, that is, the obvious size effect and solidification, Shrinkage, stress and other problems to avoid or reduce the occurrence of defects such as component segregation, deformation, and cracking of iron castings. Generally, for the appearance quality of professional iron castings, comparison samples can be used to judge the surface roughness of boiler fittings; fine cracks on the surface can be inspected by coloring method and magnetic powder method.