Please solve this problem and explain it as wellSolutionDuri

Solution

During cutting operation about 90% of mechanical energy is converted to thermal energy. There are 3 zones are devided in primary zone, secondary zone and tirtery zone.

The biggest deformation (chip formation) occurrs in the primary deformation zone, followed by the secondary deformation zone. Therefore, the highest stress also occurrs in this area. The highest temperature on
the chip usually occurrs in the sliding region, while the heat generated in the sticking region causes the workpiece material to adhere with the tool.

Also Speed, feed and depth of the cut is also directly proposional to the temperature rise chip and tool region.

1. a. temperature rise because of plasic deformation at cutting zone,

b. heat generated due to interface between tool and work piece materail. It mainly due to friction between the tool and metal workpiece,

2. As the rake angle increase the cutting force on the required to cut the chip reduces. But heat more heat is generated by increasing rake angle.

3. Shear angle is adusted to minimize the maximum cutting forces.

also from the Merchant circle cutting diagram you can conclude that; lower shear angle = larger shear strain.

Shear angle depends on the material type tool. Genearlly ductile materials have lower shear angles as compared to brittle material.

So, increasing shaer angle will rise the temperature of chip because of more deformation of chip deformation.