机械制造技术基础英文课件CHAPTER1(5)

1.1.2.4 How to mark the tool angleThe azimuth angles between the cutting edgeand the tool surfacedetermined in the reference system for the marked angles are called ―marked angles of cutting tool‖ .If the cutting edge is curved, or the rake surface or flank surface is curved, a tangential line or surface passing through a point in the edge is used to define the angles.Fig.1.11shows the name, symbol and definition of the marked angles in the main section reference systemRakeγ0clearance angleα0Cutting edge angle κrκrinclination angleλsλsLikewise, there are four angles related with the minor cutting edge, which are, minor cutting edge angleκ?r ，minor inclination angleλ ?s，minor rakeγ ?0，minor clearance angleα ?0. The definition is similar to that of the main cutting edgerakeγ0：the angle between the rake surface and the reference plane（measured in main section ）。Fig.1.11(a) the tool angle marked in the main section systemClearance angleα0：angle between flank and cutting edge plane（measured in main section)Fig.1.11(b) the tool angle marked in the main section systemkrCutting edge angle κr, measured in the reference plane,formed by the cutting edge and feed directionFig.(c) the tool angle marked in the main section systemInclination angle λs：measured in the cutting edge plane, formed by cutting edge and reference planeFig.1.11(d) the tool angle marked in the main section system