How to solve the rough surface of metal castings using casting molds?

Release time:

Sep 11,2023

When we use the casting mold advantage will see the surface of the casting rough not smooth, not professional technical workers generally do not know what is going on, how to solve this problem in the professional technical workers seem to be a very simple problem, generally: the cavity surface roughness and molten metal and cavity surface produced a chemical reaction...

When we use the casting mold advantage will see the surface of the casting rough not smooth, not professional technical workers generally do not know what is going on, how to solve this problem in the professional technical workers seem to be a very simple problem, generally: the cavity surface roughness and molten metal and cavity surface produced a chemical reaction, mainly reflects the following:

1. The particles of the embedding material are coarse and not fine after stirring.

2. After curing, the embedding material is directly put into the furnace for roasting, and the moisture is too much.

3. The high temperature of the roasting is too high, or the roasting time is too long, so that the inner surface of the cavity is too dry.

4. The heating rate of roasting is too fast, and the expansion difference occurs at different positions in the cavity, which makes the inner surface of the cavity peel off.

5. Insufficient roasting of the mold. When the molten metal is cast, the decomposition of the embedding material will be caused, and more gas will occur, resulting in pitting on the surface of the casting.

6. After the molten metal is cast, the local temperature in the cavity is too high, and the surface of the casting is locally rough.

7. The melting temperature of the metal or the roasting temperature of the casting ring is too high, so that the metal reacts with the cavity, and the surface of the casting burns the embedding material.

Probably the solution is as follows:

Do not over-melt the metal.

2, the baking temperature of the mold should be kept appropriate, not too high.

3. The baking temperature of the mold should not be too low.

Note: The calcination temperature of phosphate embedding material is 800 degrees -900 degrees.

4. Avoid the phenomenon that the organization faces the direction of the sprue.

5. Coat the wax type with a liquid to prevent burning.

Focus on hot spots

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