Manufacturing Processes 01. Chose the correct answer: 1. Which of the following are variations of sheet-metal-bending operations: (a) coining, (b) flanging, (e hemming, (d) ironing, (e) notching, (f) shear spinning, (g) trimming, and (h) tube bending? 2. Springback in a sheet-metal-bending operation is the result of which one of the following: (a) elastie modulus of the metal, (b) elastic recovery of the metal, (c) overbending, (d) overstraining, or (e) yield strength of the metal? 3. The cutting force in a sheet-metal blanking operation depends on which mechanical property of the meta (one correct answer): (a) compressive strength, (b) modulus of elasticity, (c) shear strength, (d) strain rate, (e tensile strength, or (f) yield strength? 4. A circular sheet-metal slug produced in a hole punching operation will have the same diameter as (a) the die opening or (b) the punch? 5. As sheet-metal stock hardness increases in a blanking operation, the clearance between punch and die should be (a) decreased, (b) increased, or (c) remain the same? 6. Which of the following stress or strength parameters is used in operation (one best answer): (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensile strength, or (e) yield strength? 7. Notching is the operation of... (a) Removal of excess metal from the edge of a strip to make it suitable for drawing without wrinkling, (b) Cutting of the excess metal at edge which was required for gripping purpose during press working operation, (c) Cutting in a single line across a part of the metal strip to allow bending or forming in progressive die operation while the part remains attached to the strip, (d) Punching in which punch is stopped as soon as the metal fracture is completed and metal is not removed but held in hole, (e) None of the above. 8. The important mechanical property of a material for extrusion purposes is..... (a) Continuity, (b) Ductility, (c) Elasticity, (d) Plasticity, (e) Brittleness. 9. The increase in hardness due to cold working is called.. (a) Cold hardening, (b) Hot hardening, (c) Work hardening, (d) Age-hardening. 10. Swaging is the operation... (a) In which the edges of sheet are turned over to provide stiffness and a smooth edge, (b) Of producing contours in sheet metal and of bending previously roll formed sections (c) In which a series of impact blows are transferred on dies so that solid or tubular work changes in cross- section or geometric shape (d) Employed to expand a tubular or cylindrical part (e) None of the above computation of the force in an extrusion Q2. A hot upset forging operation is performed in an open die. The initial size of the workpart is: Do = 25 mm, and ho = 50 mm. The part is upset to a diameter = 50 mm. The work metal at this elevated temperature yields at 85 MPa (n = 0). Coefficient of friction at the die-work interface = 0.40. Determine (a) final height of the part, and (b) maximum force in the operation. Q3. An indirect extrusion process starts with an aluminum billet with diameter = 2.0 in and length = 3.0 in. Final cross section after extrusion is a square with 1.0 in on a side. The die angle = 90°. The operation is performed cold and the strength coefficient of the metal K = 26,000 lb/in? and strain hardening exponent n = 0.20. In the Johnson extrusion strain equation, a = 0.8 and b = 1.2. (a) Compute the extrusion ratio, true strain, and extrusion strain. (b) What is the shape factor of the product?
Manufacturing Processes 01. Chose the correct answer: 1. Which of the following are variations of sheet-metal-bending operations: (a) coining, (b) flanging, (e hemming, (d) ironing, (e) notching, (f) shear spinning, (g) trimming, and (h) tube bending? 2. Springback in a sheet-metal-bending operation is the result of which one of the following: (a) elastie modulus of the metal, (b) elastic recovery of the metal, (c) overbending, (d) overstraining, or (e) yield strength of the metal? 3. The cutting force in a sheet-metal blanking operation depends on which mechanical property of the meta (one correct answer): (a) compressive strength, (b) modulus of elasticity, (c) shear strength, (d) strain rate, (e tensile strength, or (f) yield strength? 4. A circular sheet-metal slug produced in a hole punching operation will have the same diameter as (a) the die opening or (b) the punch? 5. As sheet-metal stock hardness increases in a blanking operation, the clearance between punch and die should be (a) decreased, (b) increased, or (c) remain the same? 6. Which of the following stress or strength parameters is used in operation (one best answer): (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensile strength, or (e) yield strength? 7. Notching is the operation of... (a) Removal of excess metal from the edge of a strip to make it suitable for drawing without wrinkling, (b) Cutting of the excess metal at edge which was required for gripping purpose during press working operation, (c) Cutting in a single line across a part of the metal strip to allow bending or forming in progressive die operation while the part remains attached to the strip, (d) Punching in which punch is stopped as soon as the metal fracture is completed and metal is not removed but held in hole, (e) None of the above. 8. The important mechanical property of a material for extrusion purposes is..... (a) Continuity, (b) Ductility, (c) Elasticity, (d) Plasticity, (e) Brittleness. 9. The increase in hardness due to cold working is called.. (a) Cold hardening, (b) Hot hardening, (c) Work hardening, (d) Age-hardening. 10. Swaging is the operation... (a) In which the edges of sheet are turned over to provide stiffness and a smooth edge, (b) Of producing contours in sheet metal and of bending previously roll formed sections (c) In which a series of impact blows are transferred on dies so that solid or tubular work changes in cross- section or geometric shape (d) Employed to expand a tubular or cylindrical part (e) None of the above computation of the force in an extrusion Q2. A hot upset forging operation is performed in an open die. The initial size of the workpart is: Do = 25 mm, and ho = 50 mm. The part is upset to a diameter = 50 mm. The work metal at this elevated temperature yields at 85 MPa (n = 0). Coefficient of friction at the die-work interface = 0.40. Determine (a) final height of the part, and (b) maximum force in the operation. Q3. An indirect extrusion process starts with an aluminum billet with diameter = 2.0 in and length = 3.0 in. Final cross section after extrusion is a square with 1.0 in on a side. The die angle = 90°. The operation is performed cold and the strength coefficient of the metal K = 26,000 lb/in? and strain hardening exponent n = 0.20. In the Johnson extrusion strain equation, a = 0.8 and b = 1.2. (a) Compute the extrusion ratio, true strain, and extrusion strain. (b) What is the shape factor of the product?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
Related questions
Question
![Manufacturing Processes
Q1. Chose the correct answer:
1. Which of the following are variations of sheet-metal-bending operations: (a) coining, (b) flanging, (c)
hemming, (d) ironing, (e) notching, (f) shear spinning, (g) trimming, and (h) tube bending?
2. Springback in a sheet-metal-bending operation is the result of which one of the following: (a) elastic
modulus of the metal, (b) elastic recovery of the metal, (c) overbending, (d) overstraining, or (e) yield strength
of the metal?
3. 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?
4. A circular sheet-metal slug produced in a hole punching operation will have the same diameter as (a) the
die opening or (b) the punch?
5. As sheet-metal stock hardness increases in a blanking operation, the clearance between punch and die should
be (a) decreased, (b) increased, or (c) remain the same?
6. 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, or (e) yield strength?
7. Notching is the operation of...
(a) Removal of excess metal from the edge of a strip to make it suitable for drawing without wrinkling, (b)
Cutting of the excess metal at edge which was required for gripping purpose during press working operation,
(c) Cutting in a single line across a part of the metal strip to allow bending or forming in progressive die
operation while the part remains attached to the strip, (d) Punching in which punch is stopped as soon as the
metal fracture is completed and metal is not removed but held in hole, (e) None of the above.
8. The important mechanical property of a material for extrusion purposes is.....
(a) Continuity, (b) Ductility, (c) Elasticity, (d) Plasticity, (e) Brittleness.
9. The increase in hardness due to cold working is called. .
(a) Cold hardening, (b) Hot hardening, (c) Work hardening, (d) Age-hardening.
10. Swaging is the operation...
(a) In which the edges of sheet are turned over to provide stiffness and a smooth edge, (b) Of producing
contours in sheet metal and of bending previously roll formed sections
(c) In which a series of impact blows are transferred on dies so that solid or tubular work changes in cross-
section or geometric shape
(d) Employed to expand a tubular or cylindrical part
(e) None of the above
Q2. A hot upset forging operation is performed in an open die. The initial size of the workpart is: Do = 25
mm, and ho = 50 mm. The part is upset to a diameter = 50 mm. The work metal at this elevated temperature
yields at 85 MPa (n = 0). Coefficient of friction at the die-work interface = 0.40. Determine (a) final height
of the part, and (b) maximum force in the operation.
Q3. An indirect extrusion process starts with an aluminum billet with diameter = 2.0 in and length = 3.0 in.
Final cross section after extrusion is a square with 1.0 in on a side. The die angle = 90°. The operation is
performed cold and the strength coefficient of the metal K = 26,000 lb/in? and strain hardening exponent n =
0.20. In the Johnson extrusion strain equation, a = 0.8 and b = 1.2. (a) Compute the extrusion ratio, true strain,
and extrusion strain, (b) What is the shape factor of the product?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe9ae0890-09cc-404b-b8d8-43b8dfb504f9%2F7906c7b6-35dd-43a9-89be-dccdfb11e431%2Fi7isd_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Manufacturing Processes
Q1. Chose the correct answer:
1. Which of the following are variations of sheet-metal-bending operations: (a) coining, (b) flanging, (c)
hemming, (d) ironing, (e) notching, (f) shear spinning, (g) trimming, and (h) tube bending?
2. Springback in a sheet-metal-bending operation is the result of which one of the following: (a) elastic
modulus of the metal, (b) elastic recovery of the metal, (c) overbending, (d) overstraining, or (e) yield strength
of the metal?
3. 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?
4. A circular sheet-metal slug produced in a hole punching operation will have the same diameter as (a) the
die opening or (b) the punch?
5. As sheet-metal stock hardness increases in a blanking operation, the clearance between punch and die should
be (a) decreased, (b) increased, or (c) remain the same?
6. 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, or (e) yield strength?
7. Notching is the operation of...
(a) Removal of excess metal from the edge of a strip to make it suitable for drawing without wrinkling, (b)
Cutting of the excess metal at edge which was required for gripping purpose during press working operation,
(c) Cutting in a single line across a part of the metal strip to allow bending or forming in progressive die
operation while the part remains attached to the strip, (d) Punching in which punch is stopped as soon as the
metal fracture is completed and metal is not removed but held in hole, (e) None of the above.
8. The important mechanical property of a material for extrusion purposes is.....
(a) Continuity, (b) Ductility, (c) Elasticity, (d) Plasticity, (e) Brittleness.
9. The increase in hardness due to cold working is called. .
(a) Cold hardening, (b) Hot hardening, (c) Work hardening, (d) Age-hardening.
10. Swaging is the operation...
(a) In which the edges of sheet are turned over to provide stiffness and a smooth edge, (b) Of producing
contours in sheet metal and of bending previously roll formed sections
(c) In which a series of impact blows are transferred on dies so that solid or tubular work changes in cross-
section or geometric shape
(d) Employed to expand a tubular or cylindrical part
(e) None of the above
Q2. A hot upset forging operation is performed in an open die. The initial size of the workpart is: Do = 25
mm, and ho = 50 mm. The part is upset to a diameter = 50 mm. The work metal at this elevated temperature
yields at 85 MPa (n = 0). Coefficient of friction at the die-work interface = 0.40. Determine (a) final height
of the part, and (b) maximum force in the operation.
Q3. An indirect extrusion process starts with an aluminum billet with diameter = 2.0 in and length = 3.0 in.
Final cross section after extrusion is a square with 1.0 in on a side. The die angle = 90°. The operation is
performed cold and the strength coefficient of the metal K = 26,000 lb/in? and strain hardening exponent n =
0.20. In the Johnson extrusion strain equation, a = 0.8 and b = 1.2. (a) Compute the extrusion ratio, true strain,
and extrusion strain, (b) What is the shape factor of the product?
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