| 摘要 |
<p>1,140,841. Cutting tools. PRODUCTION ENG. RESEARCH ASSOCIATION OF GREAT BRITAIN. 21 Jan., 1966 [24 Jan., 1965; 1 Nov., 1965], Nos. 34571/64 and 46098/65. Headings B3B, B3K and B3L. In a method of machining such as turning, milling and planing in which a slice-like cutter bit 12 secured to a holder 11 is fed into a workpiece transversely to the cutting direction, the bit has a cutting edge formed at the juncture of its face with its side wall and is orientated in relation to the workpiece so that its face is the clearance face 15 and the side wall 14 forms the rake face, the angle of obliquity of the cutting edge to the cutting direction being the maximum which achieves effective cutting. The angle of obliquity is defined as the angle between a tangent to the cutting edge and the direction of cutting. In addition to the orientation of the cutting bit as set out above, the bit may also be inclined to the axis of the holder. The bit is secured to the holder by means of a screw and a split sleeve (see Specification 1,140,843) and may be invertable and indexable so as to present a new cutting edge to a workpiece when required. The various forms of cutter bit (see Specifications 1,140,842 and 1,140,844) may be circular or polygonal and the cutting edges may be formed by a plurality of successive arcuate portions. Also a narrow land may be provided along part or all of the cutting edge depending on the shape of the bit and the cutting conditions required.</p> |
