A cylindrical workpiece of 100mm diameter and 150mm in height (Fig. 1) is upset (open die forged) at 1200° C to 100mm height disk (Fig. 2). Material of the workpiece is low carbon steel. A graphite lubricant reduces the friction to µ=0.25. A press with 2-m/sec speeds is used to make this part. At 1200° C the material has the values for its parameters C=48MPA and m=0.08

A cylindrical workpiece of 100mm diameter and 150mm in height (Fig. 1) is upset (open die forged) at 1200° C to 100mm height disk (Fig. 2). Material of the workpiece is low carbon steel. A graphite lubricant reduces the friction to µ=0.25. A press with 2-m/sec speeds is used to make this part. At 1200° C the material has the values for its parameters C=48MPA and m=0.08

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

See similar textbooks

Similar questions

A 42mm thick low carbon steel plate is reduced to 34mm in one rolling pass. At the same time that the thickness is reduced, the plate is widened by 4%. The elastic limit of the steel plate is 174MPa and its resistance is 290MPa. The input speed of the plate is 15m/min. The radius of the cylinder is 52.8mm and the rotation speed is 49 revolutions per minute. Determine: a) The minimum coefficient of friction that will make this rolling operation possible. b) The output speed of the plate c) Slide forward
A tube of 12 mm external diameter and 1mm thickness is to be reduced to 16 mm external diameter and 0.5 mm thickness. The die angle is 24º and plug angle is 16º. The coefficients of friction at die and tube interface and tube and plug (mandrel) interface is 0.5. The flow stress of tube material is 340 N/mm2 . The tube drawing is carried at a speed of 0.4 m/s. Calculate the fixed plug
Estimate the roll force, F, and the torque for an AISI 1020 carbon-steel strip that is 200 mmwide, 10 mm thick, and rolled to a thickness of 7 mm. The roll radius is 200 mm, and itrotates at 200 rpm. Note that K = 530 MPa and n = 0.26.
A product is to be reproduced, Provided that the weight of the solid steel shaft with a length of 1m and a diameter of 100 mm does not change. It is produced from the same material with an outer diameter of 150mm. For both shafts; Compare the torques applied when it rotates as Ø= 0.716 radians in case of torsion.
A metal strip is to be rolled from an initial wrought thickness of 3.5 mm to a final rolled thickness of 2.5 mm in a single pass rolling mill having rolls of 250 mm diameter. The strip is 450 mm wide. The average coefficient of friction in the roll gap is 0.08. Taking plane strain low stress of 140 MPa, for the metal and assuming negligible spreading, the roll separating force is.....
A plate that is 260 mm wide and 27 mm thick is to be reduced in a single pass in a two‑high rolling mill to a thickness of 22 mm. The roll has a radius = 510 mm, and its speed = 25 m/min. The work material has a strength coefficient = 235 MPa and a strain hardening exponent = 0.21. Determine (a) roll force, (b) roll torque, and (c) power required to accomplish this operation
A 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.
In a rolling operation using a roll of diameter 1.5 m, if a 35 mm thick plate cannot be reduced to less than 12 mm in a single pass then calculate the coefficient of friction btween the rolls and the plate.
A cold heading operation is performed to produce the head on a steel nail. The strength coefficient for this steel is 600 MPa, and the strain hardening exponent is 0.22. Coefficient of friction at the die‑work interface is 0.14. The wire stock out of which the nail is made is 5.00 mm in diameter. The head is to have a diameter of 9.5 mm and a thickness of 1.6 mm. The final length of the nail is 120 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.
A 300mm thick slab is being cold rolled using roll of 600mm diameter.If the coefficient of friction is 0.08. Determine the maximum possible reduction.
A copper strip of 200 mm width and 300 mm thickness is to be rolled to a thickness of 295 mm The roll of radius 300 mm rotates at 100 rpm. The average shear strength of the work material is 180 MPa. Calculate the roll strip contact length and the roll force .
Estimate the power for annealed low carbon steel strip 200 mm wide and 10 mm thlck, rolled to a thickness of 6 mm The roll radius is 200 mm), and the roll rotates at 200 rev/min; use coefficient 0f friction at the die-work interface (p)= 0.1, Alow carbon steel such as AlSI 1020 has K (strength coefficient) = 530 MPaand n (stram hardening exponent) = 0.26