Shelling mould casting parts

Question: After taking out the laminated sand core from the shot dense ribbed floor cover, will the different thicknesses of different locations cause different cooling rates at different locations, which in turn will lead to deformation of the sand core? Will this happen? We drop the shot sand hole produced by the shot sand bar, will lead to the sand core surface rough and dry, resulting in low surface strength. Agricultural parts laminated sand casting if the steel liquid to this position if the steel liquid to this position has a great impact, then there will be sand trap defects. How do you usually prevent this situation?

Answer:If it is taken out too early, the mining machinery laminated sand casting resin will be deformed or cracked because it is not completely solidified. Therefore, as long as there is enough heating time. Everyone's experience is to look at the color of the mandrel, whether the heating time is sufficient, "raw" or "cooked". The cooling rate is not difficult. Unlike the distortion of the casting. For a hot core box, each core will deform according to different structure and strength. 2000 year old cores start to shrink when it is lowered to room temperature. If the shrinkage is not uniform and the strength is not enough, it will be deformed; for example, the water cooler core, oil channel core (thin) cylinder head of the four air channels will be deformed, which is important large have 1-2mm, tooling correction can only be used for warm state.