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1. rough surface. Casting surface rough, uneven, and its microscopic geometric features beyond casting surface roughness measurement limit, but has not yet formed sticky sand defects.
2. Chemical sticky sand. The casting of a part or the whole surface firmly adhered to a layer of a metal oxide, sand and clay interaction generated low-melting compounds. High hardness, it can only be rubbed off with a grinding wheel.
3. Mechanical sticky sand (penetration sticky sand). Casting part or the entire surface of the adhesion of the mechanical mixture of sand and a metal layer on. You can see the metallic luster clear sticky sand shovel.
4. RPM scarring (RPM). Scar sheet metal casting surface protrusions. Its surface roughness, sharp edges, there is a small portion of the metal and the casting body is connected to the sheet-like projections scar sand layer sandwiched between material and castings.
5. Paint scarring. Since the coating cracking in the casting process, molten metal into the crack, scar-like metal casting surface protrusions.
6. grooves. Casting surface deep (> 5ram) edges smooth V-shaped dent. Usually branched, it occurs in the casting of the lower surface.
7. stick type. Molten metal adhesion phenomenon of metal cavity surface
8. moire (mesh pattern). ① When the magnetic detection Castings surface defects appeared shell-like texture, and more appear in the casting hot spot. Shell due to the pouring temperature and high temperature, the liquid metal shell and type Na: O remaining amount is too high and precipitated "frost" react due. ② mesh pattern defects due to mold cavity surface cracking in metal type casting or die casting surface.
9. Flow marks (Watermark). Casting surface of the metal flow in the same direction, and no trends and significantly different convex or slightly concave striped defects and substrate color.
10. collapsed. Thick section or section castings junction plane collapse phenomenon. Below collapsed, and sometimes there is cratering. Sometimes there have collapsed, including craters near the surface.
11. wrinkled skin. The casting irregular coarse granular or wrinkled skin like. General with deep reticular channels.
12. strain. Metal castings and casting surface due to the engagement with the metal type or a bond, when ejection occurs along the direction of the type of scratch marks.  http://www.cnwxyszj.com  Wuxi Precision Casting Factory Home

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