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MEC 4141 MetalCutting : Introduction

Lecturer: Prof. Dr. A.K.M. Nurul AminMME DepartmentTel: 61964482E-mail: akamin@iiu.edu.my

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Introduction

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H istorical Background

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Introduction

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Introduction

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Introduction

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G eometry of Single Point Cutting Tool

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G eometry of Single Point Cutting Tool

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F ig. 7 G eometry of Single Point Cutting Tool

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G eometry of Single Point Cutting ToolThe angle of inclination of the side (main)cutting edge is measured the cutting plane Cand is the angle included between the cuttingedge and a line passing through the tool noseparallel to the basic plane R (Figs. 7 and 8). .

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G eometry of Single Point Cutting ToolThe angle of inclination (also called the slopeangle) is considered to be negat iv e if the nose isthe highest point of the cutting edge (Fig. 8 a). Itis equal to z ero if the cutting edge is parallel tothe basic plane (Fig. 8b ) and po si t iv e if the toolnose is the lowest point of the cutting edge (Fig.8c ).

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G eometry of Single Point Cutting ToolIn addition to angles and measured in themain reference plane, it is sometimes necessary(for example, in tool grinding and sharpening) torefer to angles which are measured in thelongitudinal (parallel to the tool axis) andtransverse (perpendicular to the tool axis) planesi.e. in the Machine Reference System (Fig. 9).In the longitudinal plane AA ( Y) (Fig. 23), therake and the side (main) flank surface will havethe angles lg and lg , while in the transverseplane BB ( X) (Fig. 23), the angles will be tr and

tr .

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G eometry of Single Point Cutting Tool

Fig. 9 Tool Angles in Longitudinal andTransverse planes

Xm+

Ym+

Zm+

Zm+

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G eometry of Single Point Cutting Tool lg is the back rake angle which is an angle in thetransverse plane, Y, between Y m

+ axis and thetool face.

lg is the back clearance angle which is an anglein the transverse plane, Y, between Z m + axis andthe tool flank surface. tr is the side rake angle which is an angle in thelongitudinal plane, x, between X m

+ axis and thetool face.

tr is side clearance angle which is an angle in thelongitudinal plane, x, between Z m

+ axis and thetool flank surface.

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Tool Nomenclature

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