Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
According to this theory, the relation between rake angle (α), shear angle (β) and friction angle (γ) is given by
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
It is defined as the volume of metal removed in unit time. It is used to calculate the time required to remove the specified quantity of material from the workpiece.
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
Let V - Cutting speed (m/s) Fz = Cutting force, N Work done in cutting, W = Fz × V N-m/s or W Work done in shear, Ws = Fs × Vs
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
Generally, the chip consists of series of plate elements of thickness At and it is displaced through a distance AS relative to each other as shown in Figure 1.20.
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
During metal cutting, the chips are produced due to the plastic deformation of the metal along the shear plane.
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
The following assumptions are made by Merchant to work out the force relations.
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
For designing of cutting tool, it is necessary that the various forces acting on a tool are very important.
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
During machining, long and continuous chips formed at high cutting speed will affect the machining process.
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
The various types of chips are formed during metal cutting. The type of chip formed during metal cutting depends upon the machining condition and material to be cut.
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
During machining, the cutting tool exerts a compressive force on the workpiece.
primary and secondary deformation shear zones
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
The metal cutting is a process of extensive plastic deformation to form a chip that is removed later.
Mechanics of Metal Cutting - Manufacturing Technology
Subject and UNIT: Manufacturing Technology: Unit I: Mechanics of Metal Cutting
The metal cutting processes are mainly classified into two types. (i) Orthogonal cutting process (Two-dimensional cutting). (ii) Oblique cutting process (Three-dimensional cutting).