EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 6, Problem 6.114P
To determine
The roll force and the torque.
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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
Ex: Wire is drawn through a draw die with entrance angle 15°. Starting diameter is
2.5 mm and final diameter 2.0 mm. The coefficient of friction at the work-die
interface 0.07. The metal has a strength coefficient K=205 MPa and a strain-
hardening exponent n = 0.20. Determine the draw stress and draw force in this
operation.
I need only handwritten otherwise I'll dislike
Here theta = 10 degree , tension T = 17 lb , coefficient of rolling resistance = 7.40 x 10 ^-2 in
Chapter 6 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
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- Please give me full explanation in 1hour do it fast A 4-in-thick aluminum slab is 10 in wide and 100 in long. It is reduced in one pass in a two-high rolling mill to a thickness = 3.5 in. The roll rotates at a speed = 12 rev/min and has a radius = 20 in. The aluminum has a strength coefficient = 25,000 lb/in2 and a strain hardening exponent = 0.20. Determine the (a) roll force, (b) roll torque, and (c) power required to accomplish this operation, d) Estimate the GHG emission in an hour for the rolling operation.arrow_forwardA wire is drawn through a draw die with an entry angle = 15o. The starting diameter is 0.100 in. And the final diameter = 0.080 in. The coefficient of friction at the work-given interface = 0.07. The metal has a coefficient of resistance K = 30,000 psi and a strain hardening exponent of n = 0.20. Determine the stretching force and the stretching force in this operation.arrow_forwardA 300-mm-wide strip 25-mm thick is fed (Bottom roll removed) through a rolling mill with two powered Roll No-slip point rolls each of radius = 250 mm. The work %3D Workpiece- thickness is to be reduced to 22 mm in Friction forces one pass at a roll speed of 50 rev/min. The Entry Roll Exit Torque zone gap, L zone work material has a flow curve defined by K=275 MPa and n 0.15, and the coefficient of friction between the rolls and the work is %3D assumed to be 0.12. Determine if the friction is sufficient to permit the rolling operation to be accomplished. If so, calculate the roll force, torque, and horsepower.arrow_forward
- A sheet 300mm wide 25mm thick with two drives, each with a radius of 250mmit is passed through a rolling stand with rollers. Work is thickness in one layer at 50 rpm roll speed 22reduced to mm. The work material has a yield curve determined by K = 275 MPa and n = 0.15.The friction coefficient between the rollers and the work is considered to be 0.12. Successful rolling of frictionDetermine if it is sufficient to allow its operation. If it is sufficient;a) Rolling force,b) Momentc) Calculate the power.arrow_forwardWire is drawn through a draw die with entrance angle a= 17°. Starting diameter is 3.0 mm and final diameter = 2.4 mm. The coefficient of friction at the work-die interface = 0.08. The metal has a strength coefficient K = 205 MPa and a strain-hardening exponent n = draw force in this operation. Why are multiple passes usually required to achieve the desired reduction? (Hint: Observe the draw stress value found in this question) 0.20. Determine the draw stress and Lubricant box Initial wire stock (in coil form) Multiple pass/draft drawing Draw die V2, F V3, F shown in figure. Capstan drum (holds multiple loops of wire) (1) (2) (3)arrow_forwardA cylindrical ingot with D0 = 50 mm and h0 = 40 mm is cold forged using an open die.The final height is 20 mm. The coefficient of form / friction between the die and the workpiece isconsider Kf = 1.10.The material from which the ingot is made has the following characteristics:K = 600 MPa and η = 0.12.Determine the force (F) on the operation:a) Force required at the moment of reaching the yield point (ℇ = 0.002)b) Force required when you have a height of h = 30 mmc) Force required when there is a final height of h = 20 mmd) Construct the graphs: Force vs Δh and effort vs Δharrow_forward
- 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?arrow_forwardA rectangufar workpiece has the following original dimensions: 2a = 120 mm, h = 40 mm and width = 25 mm (see Fig. 6.5). The metal has a strength coefficient of 530 MPa and a strain hardening exponent of 0.26. It is being forged in-plane strain with u = 0.25. Calculate the force required at a reduction of 25%. Use the average- Question 2 Not yet answered Marked out of 5 pressure formula. P Flag questionarrow_forwardThe team performs a cold heading operation to produce the head on a steel nail. The strength coefficient for this steel is K = 550 MPa, and the strain hardening exponent n = 0.24. Coefficient of friction at the die- work interface = 0.10. The wire stock out of which the nail is made is 4.75 mm in diameter. The head is to have a diameter = 9.5 mm and a thickness = 1.5 mm. (a) What length of stock must project out of the die in order to provide sufficient volume of material for this upsetting operation? (b) Compute the maximum force that the punch must apply to form the head in this open-die operation. Discuss the result?arrow_forward
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