In the process of precision casting, whether it is to do small parts or large machine structure, we have to do the shape of the mold after the repair parts must be modified, there are many ways to repair, and today we are four Kind of repair method,
1, parts in the mold after the local soft and false place can be used trowel strokes and then use tools and then Chung real.
2, two bios where there is a damaged part of the trowel can be attached to the sand and then sand touched the gap and then flat.
3, with a large piece of sand out of the sand can be re-brush mud on the water to repair,
4, the area is relatively large but not deep groove should be dug some of the first to make up