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过去,我厂使用的硬质合金扩孔钻(φ34D6)及铰刀(φ36D6),是采用焊接式的整体结构(图1),全长880毫米。在使用过程中,由于硬质合金刀片的磨损、缺裂
In the past, carbide reaming drills (φ34D6) and reamers (φ36D6) used in our factory were welded overall structures (Figure 1) with a total length of 880mm. In use, due to wear and tear of carbide inserts, cracks