| 摘要 |
Hole forming apparatus comprising a punch having a cutting portion at its leading end for cutting and punching a hole in a metal sheet, and a forming portion following said cutting portion for shaping the material of the metal sheet surrounding the hole, the cutting portion comprises a cutter extending from the leading end of the punch and the forming portion includes a flared section providing a material deforming shoulder, a cylindrical section having a greater lateral dimension than the cutter, and an outwardly radiused section, and a die which cooperates with the punch for shaping the material of the metal sheet surrounding the hole. Also disclosed is a tooth guided rocker and platform assembly for self dumping hoppers and the like wherein the teeth of the rockers are guided into and out of holes formed by the hole forming apparatus.
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