(1) Development of water-based quick drying and self drying casting coatings The water-based casting coating has the advantages of low cost, safety, reliability and low toxicity compared with the alcohol based casting coating. It is the first choice for the development and promotion of green casting coating. However, there...
The roughness index of the inner cavity of the turbine casing casting channel has an important impact on the engine performance. In order to reduce the impact of the channel parameters on the air flow parameters (flow, flow rate, flow direction), in addition to requiring high dimensional accuracy (dimensional...
The sand cores in the inner cavity of the cylinder head produced by the coated sand process are (generally refers to the water jacket core, water channel core and oil pipe core). There are sand sticking defects on the surface of the inner cavity (generally refers to the water...
(1) Preservation of casting coatings Prevent drying; Prevent freezing; No entry of mold and miscellaneous bacteria; After use, it shall be covered and cannot be placed open. (2) Mixing of casting coating Adequate and uniform mixing is the key to the casting coating tank, and the rotary casting coating...
Influencing factors of sand sticking defects of castings: unreasonable chemical composition of casting coatings; Insufficient fire resistance; Insufficient coating thickness; The strength of casting coating binder is insufficient. The influencing factors of subcutaneous porosity defects in castings are: the coating layer is too thick and the drying is not...
Generally, for a qualified casting coating product, in order to ensure the normal realization of the function of the casting coating product, the foundry shall at least inspect the following indicators during the use process: (1) PH value The pH value of casting coating reflects the pH value of...
In order to achieve the ideal performance, the coating should have a series of properties, mainly including physical and chemical properties, operation process performance and working performance: (1) Physical and chemical properties: including color, fineness, density or Baume degree, viscosity, suspension, solid content, thermal conductivity, pH value, chemical composition,...
(1) According to different carrier solutions, it can be divided into: water-based coatings and alcohol based organic solvent casting coatings; (2) It can be divided into sand mold coating, metal mold coating, centrifugal casting coating, lost foam casting coating, V-process casting coating, pressure casting coating and investment casting coating...
(1) Prevent sand sticking of castings. After the coating penetrates into the surface of the sand mold (core), fill the gap between the sand particles on the surface to prevent the metal liquid from penetrating into the surface to form mechanical sand sticking; Prevent chemical reaction between molten metal...
Casting coating is a commonly used auxiliary material in casting production. It is a physical suspension dispersion system in colloidal state. It can be uniformly coated on the surface of the mold or core during the casting process, and contact with high-temperature molten metal to form a protective layer...