EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 6, Problem 6.97P
To determine
The force required to upset C74500 brass rivet.
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A 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 Δh
A solid piece of steel 60 mm in diameter
and 80 mm height is reduced in height by
50 percent with the help of open die
forging. The work material characteristics
are represented by k = 350MPA and n =
0.16. If coefficient of friction is 0.1, find the
maximum forging force.
Bar stock of initial diameter = 90
mm is drawn with a draft = 15 mm.
The draw die has an entrance
Chapter 6 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
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- Question 1 solid cylindrical work piece is reduced in height by an open die forging process using flat dies on a mechanical press, powered by a 20 kW motor which operates at 35 strokes per minute with a stroke length of 160 mm. The work piece is 60 mm high and 100 mm in diameter and is to be reduced in height by 15%. The coefficient of friction during the operation is 0,18. Calculate the flow stress of work piece material if the press is set to operate at 90% of its maximum capacity.arrow_forwardA 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 forwardarrow_forwardProblem 1 The SERO CHIENS C is recreating rolling large stone columns by animal power and pivot points cut into the center of each of the column. The friction in each pivot point plus the rolling resistance creates a resisting couple of 300 ft*lb (like a rusty bearing). The yoke angle B = 10°. a) Determine how many horses (i.e. horsepower https://en.wikipedia.org/wiki/Horsepower) they need to move a 4600-lb column that is 10 ft long and 2 ft in diameter up a 0 = 5° slope from rest to 3 miles per hour after 15 feet of travel. b) Determine how many horses they need to maintain a constant speed of 3 mph up the slope. Round your answers up to the nearest integer. A fraction of horse doesn't pull very well. Assume the column rolls without slipping.arrow_forward
- A mechanical press is powered by a 23-kW motor and operates at 40 strokes per minute. It uses a flywheel, so that the crankshaft speed does not vary appreciably during the stroke. If the stroke is 150 mm, what is the maxumum const.ant force rhat can be exerted over the entire stroke length?arrow_forwardA 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.arrow_forwardA circular shape blank will be cut of 105 mm diameter from a strip of 3.3 mm with a clearance value of 0.25 mm. Take the shear strength as 400 MPa. Determine The appropriate punch diameter. Blanking force. Blanking force when the blade angle is 5.5arrow_forward
- The 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_forwardQuestion 2. It is reduced to 80 mm with forging by stacking a part with a height of 120 mm and a diameter of 75 mm. The friction coefficient between the workpiece and the mold is 0.13. The flow curve of the workpiece is defined by a strength coefficient of 165 MPa and a ping-top of 0.24. Calculate the force during the process at the moments given below and obtain the force-workpiece height graph (1) as soon as it reaches the flow point (flow unit shape change = 0.002), (2) height h = 115 mm, (3) height h = 110 mm, (4) height h = 105 mm, (5) height h = 100 mm, (6) height h = 95 mm, (7) height h = 90 mm, (8) height h = 85 mm, (9) height h = 80 mm,arrow_forwardIn a slab rolling operation, the maximum thickness reduction (del hmax) is given by del hmax = μ²R, where R is the radius of the roll and u is the coefficient of friction between the roll and the sheet. If µ = 0.1, find the maximum angle subtended by the deformation zone at the centre of the roll.arrow_forward
- A compound die will be used to blank and punch a large rectangle (90x150mm blank dimensions) out of 6061ST aluminum alloy sheet stock 3.5 mm thick. The diameter of inside hole is 25 mm. The aluminum sheet metal has a tensile strength 310 MPa. Determine the minimum tonnage press (force) to perform the blanking and punching operation (1) assume that blanking and punching occur simultaneously and (2) assume that punching occurs first, then blanking, Take: Ac-0.06arrow_forwardA cylindrical working part is subjected to a forging landfall operation. The blank is 3.0 in. high and 2.0 in. diameter. In operation, its height is reduced to 1.5 in. The work material has a yield curve defined by K = 50 ksi and n = 0.17. Assume a coefficient of friction of 0.1. Determine the force at the beginning of the process, at intermediate heights of 2.5 in. and 2.0 in., and at the final height of 1.5 in.arrow_forwardA 2 mm thick metal sheet is to be bent at an angle of one radian with a bend radius of 100 mm. If the stretch factor is 0.5, Determine the bend allowance.arrow_forward
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