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。
2
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。
3
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.