The casting surface is rough and uneven.

1. Rough surface. The surface of the casting is rough and uneven, and its microscopic geometric characteristics exceed the upper limit of the surface roughness measurement, but no grinding defects are formed.

2. Chemically bonded sand. A low melting point compound formed by the interaction of metal oxides, sand, and clay on part or all of the surface of a casting. High hardness, can only be used for grinding wheel.

3. Mechanical grinding (through sand). A mechanical mixture of sand and metal that adheres to part or the entire surface of a casting. When the shovel is stuck to the sand, a metallic sheen can be seen.

Sand and crust (sand). Sheet metal protrusions are formed on the surface of the casting. Rough surface with clear edges. A small piece of metal is attached to the body of the casting and a layer of sand is sandwiched between the bump and the casting.

Apply the scar. When the coating breaks during the casting process, the molten metal enters the crack and forms scarring metal bumps on the casting surface.

   6. Grooves. The casting surface produces deeper > 5 ram edges with smooth v-shaped indentation. Usually there are branches, which mainly occur on the upper and lower surface of the casting.

7. Type. The attachment of molten metal to the surface of a metal cavity

More. The shell texture defect on the surface of investment casting often occurs in the superheated part of the casting during magnetic inspection. Due to the high casting temperature and shell temperature, "white frost" precipitates in the molten metal, and the residual Na: O in the shell is too high. A pattern defect on the surface of a metal casting or die casting due to surface cracking of a mold cavity.

9. Flow marks (watermarks). The surface of the die casting part is consistent with the flow direction of the metal and there is no striated defect with slight bulge or depression.

10. Collapse. Collapse of the thick part or upper plane of the casting. Under collapse, shrinkage holes sometimes appear. Shrinkage sometimes occurs on the surface near the inner shrinkage cavity.

11. Wrinkled skin. There are irregular coarse lines or wrinkled skin on the casting. Usually with deep mesh.

12. Strain. When metal castings and die castings are joined or bonded to a metal type, the surfaces of the metal castings and die castings are scraped in the direction of the metal.