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A rod is drawn from a diameter of 43.0 mm to a diameter of 21.1 mm...
5. A spool of Cu wire has a starting diam. Of 2.5 mm. It is drawn...
5. A spool of Cu wire has a starting diam. Of 2.5 mm. It is drawn through a die with an opening of 2.1 mm. Coefficient of friction at the work-die interface is 0.08. The pure Cu has a strength coefficient of 300 MPa & a strain hardening exponent of 0.5. The operation is done at room temperature. Determine: (A) area reduction, (B) draw stress & C) draw force required for the operation. Assume die angle to be 100.
zis 3. A Cylindrical billet is 75 mm long and 35 mm in diameter. It is...
zis 3. A Cylindrical billet is 75 mm long and 35 mm in diameter. It is reduced by direct extrusion to 20 mm diameter. The half die angle x 45°. In the flow curve for the work metal, strength coefficient 500 MPa and strain-hardening exponent -0.25, Coefficient of friction at the work- die interface 0.15. Given that total extrusion pressure P, is the sum of the die pressure P and the friction pressure P, between the container and the extruded...
A cylindrical specimen of a metal alloy 47.9 mm long and 9.72 mm in diameter is...
A cylindrical specimen of a metal alloy 47.9 mm long and 9.72 mm in diameter is stressed in tension. A true stress of 379 MPa causes the specimen to plastically elongate to a length of 52.5 mm. If it is known that the strain-hardening exponent for this alloy is 0.2, calculate the true stress (in MPa) necessary to plastically elongate a specimen of this same material from a length of 47.9 mm to a length of 57.6 mm.
A cylindrical specimen of a metal alloy 47.8 mm long and 9.72 mm in diameter is...
A cylindrical specimen of a metal alloy 47.8 mm long and 9.72 mm in diameter is stressed in tension. A true stress of 399 MPa causes the specimen to plastically elongate to a length of 51.9 mm. If it is known that the strain-hardening exponent for this alloy is 0.3, calculate the true stress (in MPa) necessary to plastically elongate a specimen of this same material from a length of 47.8 mm to a length of 57.4 mm.
(2 marks) Calculate the forging force at the end of the stroke for a solid cylindrical...
(2 marks) Calculate the forging force at the end of the stroke for a solid cylindrical workpiece made of annealed 70-30 brass that is 150 mm high and 100 mm in diameter and is to be reduced in height by 25%. Coefficient of friction is estimated to be 0.2, its flow curve is defined by a strength coefficient of 600 MPa, and a strain-hardening exponent of 0.12. Assume that a strain = 0.002. (6 marks) Wire Drawing (a). In wire...
Q7) Bar stock of initial diameter = 90 mm is drawn with a draft = 15 mm. The draw die has an entrance angle 18, and the coefficient of friction at the work-die interface 0.08. The metal behaves as a...
Q7) Bar stock of initial diameter = 90 mm is drawn with a draft = 15 mm. The draw die has an entrance angle 18, and the coefficient of friction at the work-die interface 0.08. The metal behaves as a perfectly plastic material with yield stress 105 MPa. Determine (a) area reduction, (b) draw stress, (c) draw force required for the operation, and (d) power to perform the operation if exit velocity-1.0 m/min
Q7) Bar stock of initial diameter =...
A final height of 24.4 A 88.9 mm diameter by 133.35 mm height AZ31B billet is forged t mm at a co...
a final height of 24.4 A 88.9 mm diameter by 133.35 mm height AZ31B billet is forged t mm at a constant strain rate of 0.01 s1 at temperatures between 250 °C - 400 °C The stress strain characteristics of AZ31 material at these different temperatures at the strain rate 0.01 s, are given in Figure below. a) Estimate the force required for forging at two temperatures 250 °C- 400 °C under conditions of: sliding fraction with μ-0.2 and sticking...
Q.6 Rolling A 28+Y mm thick, 275+X mm wide metal strip is fed through a two – high rolling mill; each roll has a radius of 240+Z mm having a rotational speed of 48+Z rpm. The strip thickness is to be...
Q.6 Rolling A 28+Y mm thick, 275+X mm wide metal strip is fed through a two – high rolling mill; each roll has a radius of 240+Z mm having a rotational speed of 48+Z rpm. The strip thickness is to be reduced to 24+Y mm in one pass. The strength coefficient of the work material is 270 MPa and strain-hardening exponent is 0.12. Determine: a- The minimum coefficient of friction between the strip and roll surface μ (Use dmax =...
please answer 18.11 and 18.12 18.11 A steel ring with an outside diameter of 150 mm and an inside diameter of 100 mm...
please
answer 18.11 and 18.12
18.11 A steel ring with an outside diameter of 150 mm and an inside diameter of 100 mm is shrunk onto another steel ring with an inside diameter of 50 mm. An axial force of 56,54 kN is needed to push the rings apart. Calculate the pressure at the mating surface and the shrinkage allowance given that both rings are 20 mm thick and the coefficient of friction between the mating surfaces is 0,2. Using...
(15 pts) 6. A cylindrical part is forged in an open die. The starting diameter =...
(15 pts) 6. A cylindrical part is forged in an open die. The starting diameter = 50 mm and height = 40 mm. Height after forging = 30 mm. Coefficient of friction at the die-work interface = 0.20. Yield strength of the low-carbon steel work material = 105 MPa; its strength coefficient = 500 MPa and strain hardening exponent = 0.25. Determine (a) the romarse force for the viviu point is reacha ... tegenkor Lici........ .he longer tha n (a)...
5. A spool of Cu wire has a starting diam. Of 2.5 mm. It is drawn through a die with an opening of 2.1 mm. Coefficient of friction at the work-die interface is 0.08. The pure Cu has a strength coefficient of 300 MPa & a strain hardening exponent of 0.5. The operation is done at room temperature. Determine: (A) area reduction, (B) draw stress & C) draw force required for the operation. Assume die angle to be 100.
zis 3. A Cylindrical billet is 75 mm long and 35 mm in diameter. It is reduced by direct extrusion to 20 mm diameter. The half die angle x 45°. In the flow curve for the work metal, strength coefficient 500 MPa and strain-hardening exponent -0.25, Coefficient of friction at the work- die interface 0.15. Given that total extrusion pressure P, is the sum of the die pressure P and the friction pressure P, between the container and the extruded...
(2 marks) Calculate the forging force at the end of the stroke for a solid cylindrical workpiece made of annealed 70-30 brass that is 150 mm high and 100 mm in diameter and is to be reduced in height by 25%. Coefficient of friction is estimated to be 0.2, its flow curve is defined by a strength coefficient of 600 MPa, and a strain-hardening exponent of 0.12. Assume that a strain = 0.002. (6 marks) Wire Drawing (a). In wire...
Q7) Bar stock of initial diameter = 90 mm is drawn with a draft = 15 mm. The draw die has an entrance angle 18, and the coefficient of friction at the work-die interface 0.08. The metal behaves as a perfectly plastic material with yield stress 105 MPa. Determine (a) area reduction, (b) draw stress, (c) draw force required for the operation, and (d) power to perform the operation if exit velocity-1.0 m/min
Q7) Bar stock of initial diameter =...
a final height of 24.4 A 88.9 mm diameter by 133.35 mm height AZ31B billet is forged t mm at a constant strain rate of 0.01 s1 at temperatures between 250 °C - 400 °C The stress strain characteristics of AZ31 material at these different temperatures at the strain rate 0.01 s, are given in Figure below. a) Estimate the force required for forging at two temperatures 250 °C- 400 °C under conditions of: sliding fraction with μ-0.2 and sticking...
please
answer 18.11 and 18.12
18.11 A steel ring with an outside diameter of 150 mm and an inside diameter of 100 mm is shrunk onto another steel ring with an inside diameter of 50 mm. An axial force of 56,54 kN is needed to push the rings apart. Calculate the pressure at the mating surface and the shrinkage allowance given that both rings are 20 mm thick and the coefficient of friction between the mating surfaces is 0,2. Using...
(15 pts) 6. A cylindrical part is forged in an open die. The starting diameter = 50 mm and height = 40 mm. Height after forging = 30 mm. Coefficient of friction at the die-work interface = 0.20. Yield strength of the low-carbon steel work material = 105 MPa; its strength coefficient = 500 MPa and strain hardening exponent = 0.25. Determine (a) the romarse force for the viviu point is reacha ... tegenkor Lici........ .he longer tha n (a)...
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