Общий каталог ZCC-CT 2019 - страница 1112

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ShapeFeatures 1 7 TurningMillingDrillingTechnicalInformationIndex Technical information – drilling Technical information Solid carbide drills A Terminology 1. Drilling diameter 2. Chamfer 4 5 3. Point angle 6 4. Clearance angle 5. Chip pocket 3 6. Shank 7. Shank diameter 8. Shank length 11 9. Overall length 10 8 10. Flute length 2 9 11. Helical angle B a d a. Margin width b b. Body clearance c. Land width d. Primary cutting edge c C Cutting edge type (Conical) (Dual flats) (Centring tip) – The flank face is conical and the clearance – The flank face is dual flats, to facilitate – This shape has two-stage point angles for angel increases toward the centre of drill. cutting and initial entering. perfect centring capabilities and reduces – Wide applications, commonly used both for – Often used for small diameter drills. burrs. D soft and hard materials. – It is the first choice for drilling thin plate. E C171