| 摘要 |
<p>A dedicated hollow tool is used in boring of sand cores, which tool crushes the centre of a sand core by rotation and translation into the inside of a casting. Air under pressure flows to an edge of a crushing plate directly to the place of sand crushing. The air removes the sand in direction outside the casting, and on the way out the mixture of air and sand removes the remaining core and cleans the surface,</p> |
