Nt1330 Unit 2 Review Paper
ASSIENMENT [2]
METAL FORMING
REVIEW QUESTIONS
1- What are the differences between bulk deformation processes and sheet metal processes? Answer. In bulk deformation, the shape changes are significant, and the work parts have a low area-to-volume ratio. In sheet metal processes, the area-to-volume ratio is high.
2- Extrusion is a fundamental shaping process. Describe it.
Answer. Extrusion is a compression process in which the work material is forced to flow through a die orifice, thereby forcing its cross section to assume the profile of the orifice.
3- Why is the term press working often used for sheet metal processes?
Answer. The term press working is used because most sheet metal operations are performed on presses.
4- What …show more content…
Answer. (b). Tube and pipe cross sections can be produced by either direct or indirect extrusion.
9- Which of the following stress or strength parameters is used in the computation of the force in an extrusion operation (one best answer): (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensile strength, (e) yield strength?
Answer. (a).
10- In which of the following extrusion operation is friction a factor in determining the extrusion force (one best answer): (a) direct extrusion or (b) indirect extrusion?
Answer. (a).
11- A circular sheet metal slug produced in a hole punching operation will have the same diameter as which of the following: (a) the die opening or (b) the punch?
Answer. (a).
12- The cutting force in a sheet metal blanking operation depends on which mechanical property of the metal (one correct answer): (a) compressive strength, (b) modulus of elasticity, (c) shear strength, (d) strain rate, (e) tensile strength, or (f) yield strength? Answer. (c).
13- The holding force in drawing is most likely to be (a) greater than, (b) equal to, or (c) less than the maximum drawing
METAL FORMING
REVIEW QUESTIONS
1- What are the differences between bulk deformation processes and sheet metal processes? Answer. In bulk deformation, the shape changes are significant, and the work parts have a low area-to-volume ratio. In sheet metal processes, the area-to-volume ratio is high.
2- Extrusion is a fundamental shaping process. Describe it.
Answer. Extrusion is a compression process in which the work material is forced to flow through a die orifice, thereby forcing its cross section to assume the profile of the orifice.
3- Why is the term press working often used for sheet metal processes?
Answer. The term press working is used because most sheet metal operations are performed on presses.
4- What …show more content…
Answer. (b). Tube and pipe cross sections can be produced by either direct or indirect extrusion.
9- Which of the following stress or strength parameters is used in the computation of the force in an extrusion operation (one best answer): (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensile strength, (e) yield strength?
Answer. (a).
10- In which of the following extrusion operation is friction a factor in determining the extrusion force (one best answer): (a) direct extrusion or (b) indirect extrusion?
Answer. (a).
11- A circular sheet metal slug produced in a hole punching operation will have the same diameter as which of the following: (a) the die opening or (b) the punch?
Answer. (a).
12- The cutting force in a sheet metal blanking operation depends on which mechanical property of the metal (one correct answer): (a) compressive strength, (b) modulus of elasticity, (c) shear strength, (d) strain rate, (e) tensile strength, or (f) yield strength? Answer. (c).
13- The holding force in drawing is most likely to be (a) greater than, (b) equal to, or (c) less than the maximum drawing