Explain the back rake angle, Mechanical Engineering

Assignment Help:

Explain the Back Rake Angle

It measured the downwards slope of the top surface of the tool from the nose to the rear along the longitudinal axis. Its purpose is to guide the direction of chip flow. It also serves to protect the point of the cutting tool. The size of angle depend upon the material to be machined, the softer the material the greater should be positive rake angle. Aluminum requires more back rake angle than cast iron or steel. Back rake angle may be positive neutral or negative. Figure 1 Shows tool with positive back rake angle, figure 2 Show with neutral back rake angle, figure 3 Shows negative back rake angle.

1809_Back rake angle 1.png

Figure 1: Positive rake angle.

Positive rakes are used when cutting low tensile strength and non ferrous material, material which work harden while being machined. 

544_Back rake angle 2.png

    Figure 2: Neutral back rake angle.

Negative rack angle used for machining high tensile strength material, and also for carbide tool cutting material such as grey, cast steels, cast iron, tool steels etc.

1279_Back rake angle 3.png

  Figure 3: Negative rake angle


Related Discussions:- Explain the back rake angle

Steam systems - air-conditioning guidelines, Ensure all low points on steam...

Ensure all low points on steam mains and equipment have drip trap assembly. High pressure condensate to be taken to flash tanks, provide detail of flash tank. Use minimum 24" (610

Spindle complaint gear shift, Spindle complaint Gear shift : Check spindle...

Spindle complaint Gear shift : Check spindle comp. Gear shift for bend, rust, arms for bend and arm spring condition and availability.

Flow rate, how to calculate flow rate of liquid nitrogen? melting point(-21...

how to calculate flow rate of liquid nitrogen? melting point(-210deg) boiling point(-195.8deg) critical temp(-149.9deg) relative density(0.8) specific gravity(808.5kg/m^3) rel

Batch furnaces, Batch Furnaces: An insulated, the heating system, cha...

Batch Furnaces: An insulated, the heating system, chamber for placing the job, and a door or various doors for placing the job in place are the necessity of these furnaces. T

Machine drawing, Sketch neatly two views of a footstep braring for supporti...

Sketch neatly two views of a footstep braring for supporting a 50mm diameter vertical shsft. Give important dimensions

Draw body centred cubic structure, Draw BCC structure and determine its num...

Draw BCC structure and determine its number of atoms per unit cell, co-ordination number and highest edgeradius relation. Draw FCC structure and determine its number of atoms pe

Operations management, case study for factors affecting process design deci...

case study for factors affecting process design decisions

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd