answer the questions 6:491 of 4Q1: Complete the following sentences:HW-4!!!! 721. Impact extrusion is carried out at ........... than conventional extrusion.⠀2. Impact extrusion can be carried out as .................... or combination of these.3. In hydrostatic extrusion, friction problem can be addressed by surrounding the w.p.with ................inside the container.4. The ram force in hydrostatic extrusion is........... than in direct extrusion.5. In hydrostatic extrusion, the pressure on w.p. increases the6. In hydrostatic extrusion, the range of hydrostatic pressures can be7. Other names of ............... defect in extrusion processes are tailpipe and fishtailing.8. The centerburst defect in extrusion is developed because ofalong thecenterline of w.p.9. The piping defect in extrusion processes is formation of ............. in the end of w.p.10. Other names ofdefect in extrusion are arrowhead fracture, centerreduction.17. Because ofcracking and chevron cracking.11. The surface cracking defect in extrusion processes results from... w.p.temperatures.12. ...........are additional factors contributing to surface cracking defect in extrusionprocesses.deformation case.13.The surface cracking defect in extrusion process often occur when extrusion speedis , leading to high ............14. To address the problem of high friction in hot extrusion............... is used between......... toram and w.p.15. Because the w.p. in hydrostaticthis is leading to a more...., ...... products.16. In extrusion process, large die angle leads to... in metal flow during....., the ram pressure is increased rather than in ideal.extrusion is compressed uniformly from all sides,18. What are the advantages and disadvantages of extrusion processes?19. What are the classifications of extrusion processes?20. The ram force in indirect extrusion is lower than in direct extrusion because thereis no friction at the container walls, since the billet is .................. the container.21. What are the disadvantages of indirect extrusion?22. In23. In. a very long sections in one cycle are produced.a single part is produced in each extrusion cycle..... is an example of the discrete extrusion.24. The......……..25. The effects of friction and inhomogeneous deformation (redundant work) are takeninto account in ............... strain formula.26. The extrusion force is increased at low die angle because of ...............27. Impact extrusion can be used to produce... and ..................28. The hydrostatic extrusion can be used to manufacture, and

1. Impact extrusion is carried out at than conventional extrusion. 2. Impact extrusion can be carried out as or combination of these. 3. In hydrostatic extrusion, friction problem can be addressed by surrounding the w.p. with ................inside the container. 4. The ram force in hydrostatic extrusion is.......... than in direct extrusion.

1. Impact extrusion is carried out at than conventional extrusion. 2. Impact extrusion can be carried out as or combination of these. 3. In hydrostatic extrusion, friction problem can be addressed by surrounding the w.p. with ................inside the container. 4. The ram force in hydrostatic extrusion is.......... than in direct extrusion.

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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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.
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 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
Calculate (1) die pressure distribution and (2) forging force for plane strain forging (open die forging). Assume yield strength of the material is Y, and yielding criterion is von Mises. ho 2Lo h Forged to 2L xdx L 'x+value Note: Assume Zo Constant Plane strain Die pressure distribution h L L Die pressure distribution h MATERIAL L dx -(-1) Friction Hill Y L When 0; =Y P=Y' = Calculate forging force X L dF elemental volume Average pressure
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
3XPL@!N THE PROCESS @ND PROVIDE EXAMPLES FORMING OPERATIONS 1. Forging is mechanically working or deforming a single piece of a usually hot metal; this may be accomplished by the application of successive blows or by continuous squeezing. 2. Rolling, the most widely used deformation process, consists of passing a piece of metal between two rolls; a reduction in thickness results from compressive stresses exerted by the rolls. 3. Extrusion, a bar of metal is forced through a die orifice by a compressive force that is applied to a ram; the extruded piece that emerges has the desired shape and a reduced cross-sectional area. 4. Drawing is the pulling of a metal piece through a die having a tapered bore by means of a tensile force that is applied on the exit side.
Q/ A plate of 270 mm wide and 25 mm thick from carbon steel. A two-high rolling mill is used to reduce the thickness to 20 mm. Roll radius = 600 mm, and roll speed = 8 rpm. Strength coefficient = 500 MPa, and strain hardening exponent = 0.25. Determine (a) roll force, (b) roll torque, and (c) power required to perform the operation.
04: In Flat Strip Open Forging (FSOF) Process, A strip ingot of length (90.5mm), width (4.75cm), and initial thickness (1.75cm), is open forging to thickness (15mm). The mean flow stress o y 280+110, and friction facter (0.065), Determine the maximum plate pressure and the press capacity at. (1) forging anset. (II) forging end. 96.5mm
2) Which of the following statement(s) is/are correct for extrusion process? i. The center of the billet moves faster than the periphery due to inhomogeneous deformation in the direct extrusion of a billet. ii. Center burst, or chevron cracking can occur at low extrusion ratios. i only ii only Both i and ii None of the above
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
The team is 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 Do Figure 1: Extrusion process. Determine the following design parameters: (a) Extrusion strain (b) Ram pressure at L = 80, 40, and 10 mm. (c) Draw the relationship between the ram pressure and billet length and discuss the results. What are your recommendations to decrease the required ram pressure?
Figure 1. shows the rolling operation. Determine the position bn. of the neutral point? Neglect front and back tensions. Additional data: Hardened steel 0.04 μm and rolling temperature -190°C. rolls, surface roughness of the rolls 0.3 in. 1=Stl/s R=4 in. Fig:1 0.1 in. 7 ft/s