研究表明：法兰下端面和弧形齿下端角隅处是最难充填区域，该类零件的成形宜用冷锻成形工艺。
The results show that the areas of the bottom corners of the flange and arc gears are difficult for forming, and the cold forging process fits for these parts.
该钻头是在钻体的下端焊接着有一定耐磨性合金包镶金刚石的钻齿，上端焊接着钻柄。
The diamond drilling teeth covered with antiwear alloy are welded to the lower end of drilling body and a triangular drilling shank is welded to the upper end.
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