forging press manufacturers Explains why the surface of the castings is not smooth
Cavity rough surface and the molten metal and the cavity surface chemical reaction, mainly reflects the following conditions.
1, embedded material coarse particles, stirring is not delicate.
2, embedded material cured directly into the furnace baked Maofu, excessive water.
3, with the burning of the heating rate too fast, different positions in the cavity expansion difference, so that the inner surface of the cavity flaking.
4, the maximum temperature of roasting or roasting time is too long, so that the cavity inside is too dry and so on.
5, the melting temperature of the metal or ring casting temperature is too high, so that metal and the cavity reaction, burned the surface of the casting material embedded.
6, the mold is not fully roasted, the molten metal is cast, causing the decomposition of embedded material, the occurrence of more gas, the casting surface pitting.
7, the molten metal is cast into the cavity, causing the local temperature is too high, the casting surface of the local rough.
forging press manufacturers Tell you what to do:
Do not over melt the metal.
Casting the firing temperature is not too high.
Casting the firing temperature should not be too low (phosphate embedded material roasting temperature of 800 degrees -900 degrees)
Avoid the organization facing the casting direction of the phenomenon of depression.
Apply wax-type liquid to prevent burn-in.
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