发明授权
US4127043A Rock bit with welded bearing pins 失效
岩石钻头与焊接轴承销

Rock bit with welded bearing pins
摘要:
A rock bit and manufacturing method wherein journal-bearing pins which support rotatable cutters on the bit body are separately machined and heat treated, and then mounted on the bit body by electron-beam welding or a related process of energy-beam bonding.
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