其精良的产品可广泛应用于机械加工中的钻孔、扩孔、铰孔、锪平面及攻螺纹等。
Its sophisticated products can be widely used in machining of drilling, reaming, reaming, Tapping countersink flat and so on.
管接头的连接强度随着扩孔率、管壁厚度的增加而升高，但随着连接长度的增大而降低；
The connection strength increases with the increasing of bearizing rate of coupler and thickness of pipe wall, but decreases with the increasing of connection length.
在研制锚杆机械扩孔器的基础上，进行了扩体型锚杆的工艺试验和抗拔试验研究。
The technological and uplift tests of underreamed anchors are carried out based on the development of mechanical underreamed devices of anchorage.
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