EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 6, Problem 6.49Q
To determine
The purpose of container liner in direct extrusion and why there is no container liner in the hydrostatic extrusion.
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Illustrate the advantages of direct extrusion on indirect extrusion?
Extrusion calculation:
(1) Calculate the extrusion force ( N or mega newton) required for round billet
of 70-30 brass which is extruded at 675 °C. The diameter Db = 100 mm and
extrusion diameker De= 30 mm. Assume k = 250. (2)Sketch the problem?
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With a neat diagram differentiate the direct and indirect extrusion process. Write any two advantages and applications of extrusion.
Chapter 6 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
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- A billet 100 mm long and 40 mm diameter is to be extruded in a direct extrusion with final diameter of product 32 mm. The semi die angle is 60°. The work metal has a strength coefficient 500 Map, and strain hardening 0.2 use the Johnson formula with a=0.8 and b=1.45 to estimate the extrusion strain. Determine the pressure applied to the end of the billet as the ram moves forward.arrow_forwardThe process of extrusion is usually described as a semi-continuous operation. Explain it?arrow_forwardWrite a detail note on direct extrusion process.arrow_forward
- Write a detailed note on "Hydrostatic Extrusion". Also draw diagrams to explain the process of hydrostatic extrusion.arrow_forwardCalculate the ram pressure during indirect extrusion process when a cylindrical billet is 300 mm long and 150 mm in diameter used to produce a 45 mm diameter. In this process: a=0.8, b=1.4, K=275MPA, n=0.12.arrow_forwardA cylindrical billet that is 80 mm long and 32 mm diameter is reduced by backward extrusion to a 12 mm diameter. Half die angle is 90°. If the Johnson equation has a= 0.8 and b= 1.2 , and the flow curve for the work material has strength coefficient is 500 MPa, and strain hardening exponent is 0.8, Determine (a) extrusion ration, (b) true strain, (c) extrusion strain, (d) ram pressure, and (e) ram force.arrow_forward
- 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) MPaarrow_forwardYou 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?arrow_forwardWhat are the advantages and limitations of extrusion process?arrow_forward
- A brass billet is to be extruded from its initial diameter of 100 mm to a final diameter of 50 mm, working temperature is 700 degrees celsius and extrusion constant is 250 MPa. Find out the force required for extrusion?arrow_forwardWhat is the difference between drawing and extrusion?arrow_forwardPlease answer to both parts: (a) Explain the function of a dummy block in the Direct Extrusion Process. (b) Explain the differences between Forward Extrusion and Reverse Extrusion processes.arrow_forward
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