Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Chapter 27, Problem 6P
The strength of a pull broach is determined by its minimum cross section, which usually occurs either at the root of the first tooth or at the pull end. Suppose the minimum root diameter is
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9. A rectangular hole of size 100 mm x 50 mm is to be made on a 5 mm thick sheet of steel having
ultimate tensile strength and shear strength of 500 MPa and 300 MPa, respectively. The hole is made by
punching process. Neglecting the effect of clearance, the punching force (in kN) is
2) In an orthogonal cutting operation, the cutting tool has a rake angle = 20°. The chip thickness
before the cut = 0.25 mm. If the cutting force and thrust force are measured during an
orthogonal cutting operation with values, Fc = 1450 N and Ft = 1990 N. The width of the
orthogonal cutting operation w = 2.5 mm. the friction angle B is = 79.91° Determine:
The Shear Angle
The Shear Strain
The Shear Strength of the material
The Force of Friction
Please answer the problem with FREE BODY DIAGRAM AND COMPLETE SOLUTIONS. Also, box the final answer and explain the step-by-step solutions. Thank you! GUARANTEED UPVOTE!!!!
STRENGTH OF MATERIALS
Topics:
Torsion
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Torsion of Thin-Walled Tube
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PROBLEM:The turbine motor moving at 378 rev/ min can produce 2.5 hp. The shaft diameter is 1.25 inches. Calculate the torque and shearing stress developed in the shaft.
Chapter 27 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 27 - Why is sawing one of the most efficient of the...Ch. 27 - Explain why tooth spacing (pitch) is important in...Ch. 27 - What is the tooth gullet used for on a saw blade?Ch. 27 - Explain what is meant by the set of the teeth on a...Ch. 27 - How is tooth set related to saw kerf?Ch. 27 - Why can a bandsaw blade not be hardened throughout...Ch. 27 - What are the advantages of using circular saws?Ch. 27 - Why have bandsawing machines largely replaced...Ch. 27 - Explain how the hole in Figure 27.7 is made on a...Ch. 27 - How would you calculate or estimate Tm for a...
Ch. 27 - What is the disadvantage of using gravity to feed...Ch. 27 - What is unique about the broaching process...Ch. 27 - Can a thick saw blade be used as a broach? Why or...Ch. 27 - Broaching machines are simpler in a basic design...Ch. 27 - Why is broaching particularly well-suited for mass...Ch. 27 - In designing a broach, what would be the first...Ch. 27 - Why is it necessary to relate the design of a...Ch. 27 - What two methods can be utilized to reduce the...Ch. 27 - For a given job, how would a broach having...Ch. 27 - Why are the pitch and radius of the gullet between...Ch. 27 - Why are broaching speeds usually relatively low,...Ch. 27 - What are the advantages of shell-type broach...Ch. 27 - Why are most broaches made from alloy or...Ch. 27 - What are the advantages of TiN-coated broaching...Ch. 27 - For mass-production operations, which process is...Ch. 27 - What is the difference between the roughing teeth...Ch. 27 - The sides of a square, blind hole must be machined...Ch. 27 - The interior, flat surfaces of socket wrenches,...Ch. 27 - Prob. 29RQCh. 27 - What are some ways to improve the efficiency of a...Ch. 27 - To what extent is filing different from sawing?Ch. 27 - Prob. 32RQCh. 27 - Prob. 33RQCh. 27 - Prob. 34RQCh. 27 - A surface 12 in. long is to be machined with a...Ch. 27 - The pitch of the teeth on a simple surface broach...Ch. 27 - Estimate the (approximate maximum) horsepower...Ch. 27 - Estimate the approximate force acting in the...Ch. 27 - In cutting a 6-in.-long slot in a piece of AISI...Ch. 27 - The strength of a pull broach is determined by its...Ch. 27 - Suppose you want to shape a block of metal 7 in....Ch. 27 - Could you have saved any time in Problem 7 by...Ch. 27 - Derive the equation for shaping cutting speed.Ch. 27 - How many strokes per minute would be required to...Ch. 27 - How much time would be required to shape a flat...Ch. 27 - What is the metal removal rate in Problem 11 if...Ch. 27 - Suppose you decide to mill the flat surface...Ch. 27 - A planer has a 10-hp motor, and 75% of the motor...
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- 1) Orthogonal Cutting: In an orthogonal cutting test on mild steel, the following results are obtained: to = 0.3 mm tc = 0.7 mm w = 3 mm Fc = 1000 N FN = 500 N (Fp in your book) Tool rake y = 0 Calculate: a. Mean angle of friction ß on tool face b. Mean shear stress Tsarrow_forwardA circular shape blank will be cut of 107 mm diameter from a strip of 3.5 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 5.70 o.arrow_forwardCompletely solve and box the final answers. Write legibly 1. Estimate the bending load for a 6 x 19 steel wire rope, which has a nominal diameter of 36 mm and consists of 2.3-mm diameter wires.The rope is to wrap around a 2.7-meters diameter sheave. 2. Estimate the percent variations of chain speed for sprockets having 19 teeth.arrow_forward
- How large a hole can be bored in a 4 in diameter shaft without increasing the maximum shear stress by more than 10%?arrow_forwardExample 2. energy per hole during each revolution. Each piercing takes 40 per cent of the time needed to make one revolution. The punch receives power through a gear reduction unit which in turn is fed by a motor driven belt pulley 800 mm diameter and turning at 210 r.p.m. Find the power of the electric motor if overall efficiency of the transmission unit is 80 per cent. Design a cast iron flywheel to be used with the punching machine for a coefficient of steadiness of 5, if the space considerations limit A punching press pierces 35 hotes per minute in a plate using 10 kN-m of the maximum diameter to 1.3 m. Allowable shear stress in the shaft material = 50 MPa Allowable tensile stress for cast iron = 4 MPaarrow_forwardA circular shape blank will be cut of mm diameter from a strip of 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 A circular shape blank will be cut of mm diameter from a strip of 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 o.arrow_forward
- Calculate the cutting force for the punching of the triangular slot shown in the figure for Mild steel and Aluminum 6061 alloy. 30 Each side of the triangle is equal to 30 mm. t= 5 mm (hints) Cutting force = StL S = Shear strength of sheet-metal 1 = Sheet-metal thickness L= Length of cutting edge T= Ultimate tensile strength of sheet-metal Tensile Strength (N/mm) Material Mild Steel 440 Aluminum 6061 alloy 310 AISI type 304 Stainless Steel 505 Shear strength for: Aluminum is approximately 50% of its tensile strength Mild steel is approximately 60% of its tensile strength Stainless steel is approximately 90% of its tensile strengtharrow_forwardCalculate the force needed to cut two metal parts of 10 mm dia and 15 5 points mm dia . if the ultimate shear stress is 100 Mpa or N/mm2, what is the force required? *arrow_forward7.6 An orthogonal machining operation is performed on a mild steel-part 5 mm wide. The tool cutting depth is 0.25 mm, thickness of the chip is 0.35 mm and the tool rake angle is 10°. From a tool post dynamometer the cutting force is measured as 1900 N. Determine the shear angle, the friction coefficient between the chip and tool face, and estimate the shear strength of the workpiece material.arrow_forward
- Please solve it correctly , Don't Use Ai tool. (1) A twist drill bit is used to drill a hole of diameter 2.0 at 4578.1 rpm at a feed rate of 2.5 in/min. Calculate the MRR in in^3/min. Take "pi" = 3.14. Round your answer to the nearest tenth.arrow_forwardA 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 48 in diameter diamond saw blade is mounted on a pulley driven steel shaft, requiring a blade perimeter linear speed of 150 ft/sec. Motor drive is 125 hp at 1200 rpm, with 6 inches diameter pulley. Find the shaft diameter.arrow_forward
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