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    • 82. 发明授权
    • Surface decarburization of a drill bit
    • 钻头表面脱碳
    • US5609447A
    • 1997-03-11
    • US314510
    • 1994-09-28
    • Robert W. BritzkeJimmy EasonZhigang Fang
    • Robert W. BritzkeJimmy EasonZhigang Fang
    • B23B51/02B24B3/26B24D3/26C21D3/04C21D9/22
    • C21D9/22B23B51/02B24B3/26B24D3/26C21D3/04B23B2228/10B23B2251/122B23B2251/125B23B2251/18B23B2251/426Y10T408/78Y10T408/9097
    • A drill but having a drill body with a cutting tip, an axis of symmetry, and a plurality of flutes wherein said flutes have a rake surface at said cutting tip. The cutting tip includes a plurality of side blades between said flutes and joined at a web, a plurality of flank surfaces extending from an outer diameter of said cutting tip to said axis of symmetry, and a plurality of primary cutting edges at the intersection of said flank surfaces with said rake surfaces. Both the rake and flank surfaces have extensions which would intersect each other at an intersection. The primary cutting edges include an angular surface formed on the forward end of said rake surfaces which is located such that the length of said extension of said rake surface measured between said angular surface and said intersection is a first predetermined value and the length of said extension of said flank surface measured between said angular surface and said intersection is a second predetermined value. The primary cutting edges also have a hardened layer formed from the outer surface of the primary cutting edge.
    • 一种钻头,但具有具有切割尖端,对称轴线和多个凹槽的钻体,其中所述凹槽在所述切割尖端处具有前刀面。 切割尖端包括在所述凹槽之间并在腹板处连接的多个侧叶片,从所述切割尖端的外径延伸到所述对称轴线的多个侧面表面以及在所述切口的交叉点处的多个主切削刃 具有所述前刀面的侧面。 两个耙面和侧面都有一个在交叉点处相交的延伸部分。 主切削刃包括形成在所述前刀面的前端上的角度表面,其被定位成使得在所述角度表面和所述相交处之间测量的所述前刀面的所述延伸部分的长度是第一预定值,并且所述延伸部分的长度 在所述角度表面和所述交点之间测量的所述侧面的第二预定值。 主切削刃还具有由主切削刃的外表面形成的硬化层。