The problem related to the difficult to making screw milling cutter welding blank has been solved successfully by using suitable forming process and sintering process.
采用合理的成形工艺和烧结工艺，成功地解决了螺旋铣刀毛坯生产难的问题。
The top part of one inner bolt which matches the blank hole channel of the outer hollow screw is also conical. The rear is provided with a thread and a tetragonal body for holding.
一与外空心螺钉的盲孔道相匹配的内螺栓，内螺栓的尖端部位亦为锥形，尾部设有螺纹和供握持用的四方体。
The utility model has simple structure, and the decorative cover is interchangeable with the blank cap or the screw plug, which simplifies operation and use.
本实用新型结构简单，装饰盖与闷盖或丝堵具有互换性，操作使用简便易行。
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