发明名称 |
ZUSAMMENGESETZTER SCHNEIDEINSATZ. |
摘要 |
A method of producing a composite cutting insert for a twist drill includes the steps of cutting an intermediate blank (16) from a composite diamond compact (10). The intermediate blank comprises a relatively broad tungsten carbide strip (20) with a relatively narrow polycrystalline diamond strip (18) at one edge. First and second cutting insert halves (22.1, 22.2) are cut from the intermediate blank, each cutting insert half defining a cutting edge (26, 28) of the diamond material. The cutting insert halves are arranged back-to-back to form a composite cutting insert (24), with the cutting edges on opposite sides of a central plane (A-A). The cutting edges are arranged to define a chevron shaped composite cutting edge. The cutting insert halves are preferably brazed together to form a unitary cutting insert. The invention extends to a method of producing a twist drill including the steps of forming a slot-shaped seat (30) diametrally in the end of a twist drill body, and brazing the composite cutting insert into the seat. <IMAGE> |
申请公布号 |
AT117926(T) |
申请公布日期 |
1995.02.15 |
申请号 |
AT19920301722T |
申请日期 |
1992.02.28 |
申请人 |
DE BEERS INDUSTRIAL DIAMOND DIVISION (PROPRIETARY) LIMITED |
发明人 |
SANI, MOHAMMAD NAJAFI;DUFFERWIEL, GRAEME DAVID |
分类号 |
B23B51/00;B23B27/14;B23P15/32;E21B10/56;E21B10/567;E21B10/58;(IPC1-7):B23P15/32;B23B51/02 |
主分类号 |
B23B51/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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