Question:-
Match List I with List II and select the correct answer:
List I (Parts)
A. Seamless tubes
B. Accurate and smooth tubes
C. Surfaces having higher hardness and fatigue strength
List II (Machine tool parts)
1. Roll forming
2. Shot penning
3. Forging
4. Cold forming
Option (A)
ABC
142
Option (B)
ABC
231
Option(C)
ABC
132
Option(D)
ABC
241
Correct Option:
(A)
Question Solution:
Seamless tubes: Rotary tube piercing is a hot working process for making long, think walled seamless pipe and tubings.
Shot penning: Peen forming is used to produce curvatures on the thin sheet metals by the shot peening one surface of the sheet.
In the shot peening, the workpiece surface is hit repeated with a large number of the cast steel glass or the ceramic shot (small balls), which make overlapping indentations on the surface. This action causes the plastic surface deformation at depths upto 1.25mm.
This process is used intensively on shafts, gears, springs, oil-well drilling equipment and jet engine parts such as the turbine and the compressor blades.
question-answer-faq-8973