Chapter 18: Problem 18.17 (SI units) A cylindrical billet is 200 mm long and 1004)mm in diameter. It is reduced by indirect extrusion to a 30 mm diameter. Die angle = 90º.In the Johnson equation, a =coefficient = 250 MPa and strain-hardening exponent = 0.15. Determine (a) Extrusion ratio,(b) true strain (homogeneous deformation), (c) extrusion strain, (d) ram pressure, and (e)ram force.0.8 and b = 1.5. In the flow curve for the work metal, strength%3D

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4) mm in diameter. It is reduced by indirect extrusion to a 30 mm diameter. Die angle = 90°. In the Johnson equation, a = 0.8 and b = 1.5. In the flow curve for the work metal, strength coefficient = 250 MPa and strain-hardening exponent = 0.15. Determine (a) Extrusion ratio, (b) true strain (homogeneous deformation), (c) extrusion strain, (d) ram pressure, and (e) Chapter 18: Problem 18.17 (SI units) A cylindrical billet is 200 mm long and 100

4) mm in diameter. It is reduced by indirect extrusion to a 30 mm diameter. Die angle = 90°. In the Johnson equation, a = 0.8 and b = 1.5. In the flow curve for the work metal, strength coefficient = 250 MPa and strain-hardening exponent = 0.15. Determine (a) Extrusion ratio, (b) true strain (homogeneous deformation), (c) extrusion strain, (d) ram pressure, and (e) Chapter 18: Problem 18.17 (SI units) A cylindrical billet is 200 mm long and 100

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

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During a direct extrusion process for a billet with 5 in long and diameter 2.5 in to 1.6 in. For the work metal, strength coefficient is 75000 Ib/in, and strain hardening exponent is 0.4, also the die angle of extrusion is 90. In Johnson extrusion strain equation a = 0.8, and b= 1.5. Determine: (a) extrusion ratio (b) true strain (c) extrusion strain, and (d) ram pressure at length 5, 4.2, 2.3,1.5,and 0 in.
3) A direct extrusion process is used to reduce a cylindrical part that has a diameter of 5 inch and is 10 inch long to a cylinder with 2 inch diameter. The die angle is 90°. The cylinder material has a strength coefficient of 10 ksi and strain hardening exponent Of 0.15. Determine a. Extrusion strain b. Ram force
A billet 100 mm long and 30 mm in diameter is to be extruded in a direct extrusion operation with extrusion ratio r, = 3.5. The extrudate has a round cross section. The die angle (half angle) = 60°. The work metal has a strength coefficient = 720 MPa, and strain hardening exponent = 0.17. Use the Johnson formula with a = 0.8 andb= 1.2 to estimate extrusion strain. Determine the following: 1. Diameter of the extrudate = mm 2. Butt volume = mm3 3. Actual extrudate length = mm 4. The pressure applied to perform the extrusion process = MPa 5. Ram force = N.
A direct extrusion operation produces a product with a 20 mm x 60 mm cross sectional area from a brass billet whose diameter = 125 mm and length = 350 mm. The flow curve parameters of the brass are K = 700 MPa and n = 0.35. In the Johnson strain equation, a = 0.7 and b = 1.4. Determine (a) the extrusion ratio, (b) the shape factor, (c) the force required to drive the ram forward during extrusion at the point in the process when the billet length remaining in the container = 300 mm, and (d) the length of the extruded section at the end of the operation if the volume of the butt left in the container is 600,000 mm3
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You have been asked to work on some design problems and technically support the team working on extrusion and forging operations: 1) The team are extruding a billet that is 80 mm long with diameter of 40 mm is directly to a diameter of 20 mm. The extrusion die has a die angle of 75°, see Figure 1. For the work metal, K = 600 MPa and n = 0.25. In the Johnson extrusion strain equation, a = 0.8 and b = 1.4. Remaining billet length 75 Ram pressure, p D. Dr Figure 1: Extrusion process. Determine the following design parameters: (a) Extrusion ratio. (b) True strain (homogeneous deformation). (c) Extrusion strain. (d) Ram pressure at L= 80, 40, and 10 mm. (e) Draw the relationship between the ram pressure and billet length and discuss the results. What are your recommendations to dccrcase the required ram pressure?
A cylindrical billet that is 100 mm long and 50 mm in diameter is reduced by indirect (backward) extrusion to a 20 mm diameter. The die angle is 90°. In the Johnson equation, a = 0.8 and b = 1.4. In the flow curve for the work metal, the strength coefficient = 800 MPa and strain hardening exponent = 0.13. Determine (a) extrusion ratio, (b) true strain (homogeneous deformation), (c) extrusion strain, (d) ram pressure, and (e) ram force
A cylindrical billet that is 100 mm long and 50 mm in diameter is reduced by indirect (backward) extrusion to a 20 mm diameter. The die angle is 90°. In the Johnson equation, a = 0.8 and b = 1.4. In the flow curve for the work metal, the strength coefficient = 800 MPa and strain hardening exponent = 0.13. Determine (a) extrusion ratio, (b) true strain (homogeneous deformation), (c) extrusion strain, (d) ram pressure, and (e) ram force Please answer d and e (a) Calculate the extrusion ratio. r=6.25 (b) Calculate the true strain. εtrue=1.8333 (c) Calculate the extrusion strain by using Johnson's equation. εext =3.366
following figure. What is the liners function in reverse extrusion? Container A- Describe the purpose of a container liner in direct extrusion, as shown in the Container liner - Pressing stem Billet Die. Die backer, Dummy block B- Estimate the force required in extruding 70-30 brass at 700 C if the billet diameter is 200 mm and the extrusion ratio is 30. Use the following figure. Extrusion 800 1000 1200 1400 600 400 80 Stainless steel Beryllium 400 60 70-30 Brass Cold-rolled Copper 200 steel 20 1100 Aluminum 2500 2000 1500 1000 Temperature ("F) Chromit Molybdenum Extrusion constant, k (10° psi) MPa
A billet 75mmlong and 25mmin diameter is to be extruded in a direct extrusion operation with extrusion ratio rx = 4.0. The extrudate has a round cross section. The die angle (half angle) = 90° The work metal has a strength coefficient = 415 MPa, and strainhardening exponent = 0.18. Use the Johnson formula with a = 0.8 and b = 1.5 to estimate extrusion strain. Determine the pressure applied to the end of the billet as the ram moves forward
Example 10.3 A cylindrical billet of 40 mm diameter and 100 mm length is reduced by indirect (backward) extrusion to a 15 mm diameter using Flat dies. If the Johnson equation has a = 0.8 and b = 1.5 and the flow curve for the work metal has K = 750 MPa and n = 0.15, determine : (i) Extrusion rations (ii) True strain (homogencous deformation) (iii) Extrusion strain (iv) Ram force
B) In a metal forming operation, where the strength coefficient (K = 300 MPa), flow stress is 130 MPa, & the true strain is 0.02. Determine the average or mean flow stress if the maximum strain value during the deformation process is 0.3.