| 摘要 |
PURPOSE: A cylindrical rain sander is provided to improve wax pattern coating quality by dissolving unbalance of a dropping density of sand, thereby being capable of maintaining the thickness of a mold to be constant. CONSTITUTION: A cylindrical rain sander comprises a cylindrical body(10), an open type partition, and an L-type wing(100). The open type partition is combined to one side of a cylindrical body. The L-type wing is formed in the cylindrical main body and spaced apart at constant intervals. An L-type wing draws sand from the lower part thereof and supplies the sand from the upper part of the cylindrical body. In the cylindrical body, the amount of the dropping sand is uniformly dispersed. The open type partition removes pressure difference by controlling an opened area according to the atmospheric pressure generated between one side and the other side of the cylindrical rain sander. |
