EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 6, Problem 6.149D
(a)
To determine
The applications of the extruded products
(b)
To determine
The ideas for the shape of die in extrusion.
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An open die forging operation is performed to produce a steel cylinder with a diameter of
9.7mm and a height of 1.7mm. The strength coefficient for this steel is 500MPA, and the
strain hardening exponent is 0.25. Coefficient of friction at the die-work interface is 0.12.
The initial stock of raw material has a diameter of 5mm.
(a) What height/length of stock is needed to provide sufficient volume of material for this
forging operation?
(b) Compute the maximum force that the punch must apply to form the head in this open-
die operation.
A 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.
1. A cylindrical billet that is 100 mm long and 50 mm in diameter is reduced by direct (forward)
extrusion to a 20 mm diameter. The die angle is 90°. the flow curve for the work metal has a
strength coefficient of 800 MPa. Determine (a) extrusion ratio, (b) true strain (homogeneous
deformation), (c) ram pressure, and (e) ram force.
Chapter 6 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
Ch. 6 - Prob. 6.1QCh. 6 - Prob. 6.2QCh. 6 - Prob. 6.3QCh. 6 - Prob. 6.4QCh. 6 - Prob. 6.5QCh. 6 - Prob. 6.6QCh. 6 - Prob. 6.7QCh. 6 - Prob. 6.8QCh. 6 - Prob. 6.9QCh. 6 - Prob. 6.10Q
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 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 forcearrow_forwardA 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 =3.366arrow_forwardA 10 mm thick plate is rolled to 7 mm thick in a rolling mill using 1000 mm diameter rigid rolls. The neutral point is located at an angle of 0.3 times the bite angle from the exit. What will be the thickness of the plate at the neutral point.arrow_forward
- 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_forwardA cylindrical part is warm upset forged in an open die. The initial diameter is 50 mm and the initial height is 40 mm. The height after forging is 30 mm. The coefficient of friction at the die-work interface is 0.25. The yield strength of the work material is 285 MPa, and its flow curve is defined by a strength coefficient of 600 MPa and a strain-hardening exponent of 0.12. Calculate the strain at yield point.arrow_forwardOne way to describe forging processes is by the amount of work that can be done in the die. Based on this grouping, what are the three main types?arrow_forward
- Show that the true strain rate in extruding a round billet of radius r, as a function of distance x from the entry of a conical die can be given as: 2Vorštana (ro-xtana) where; Vo: ram velocityarrow_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_forwardWith a neat diagram differentiate the direct and indirect extrusion process. Write any two advantages and applications of extrusion.arrow_forward
- What are the advantages of a counterblow or impact forging machine? What are some of the properties desired in forging dies?arrow_forwardForging processes may be characterized by die work limitation. This categorization yields three basic types.arrow_forwardA deep drawing operation for a cup is performed in which the inside diameter = 60 mm %3D and the height = 50 mm. The blank thickness = 3 mm, and %3D %3D the starting blank diameter = 108 mm. Punch and die radii = %3D 4 mm. Tensile strength = 400 MPa and yield strength = 180 %3D MPa for this sheet metal. Determine (a) drawing ratio, (b) reduction, (c) drawing force, and (d) blankholder force. *arrow_forward
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