EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Chapter 15, Problem 28QLP
What is the purpose of the land in a drawing die? Is there a limit to the size of the land that should be used? Explain.
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Students have asked these similar questions
A deep drawing operation is to be performed on a sheet-metal blank that is 1/8 in thick.
The height (inside dimension) of the cup = 3.8 in and the diameter (inside dimension) = 5.0
in. Assuming the punch radius = 0, compute the starting diameter of the blank to complete
the operation with no material left in the flange. Is the operation feasible (ignoring the fact
that the punch radius is too small)?
1. Derive an expression for the reduction r in drawing as a function of drawing ratio DR.2. A cup is to be drawn in a deep drawing operation. The height of the cup is 75 mm and its insidediameter = 100 mm. The sheet-metal thickness = 2 mm. If the blank diameter = 225 mm, determine(a) drawing ratio, (b) reduction, and (c) thickness-to-diameter ratio. (d) Does the operation seem feasible?3. A drawing operation is used to form a cylindrical cup with inside diameter = 65 mm and height =50mm. The starting blank size = 140 mm and the stock thickness = 2.8mm. determine (a) drawing forceand (b) holding force, given that the tensile strength of the sheet metal (low-carbon steel) = 350 MPa andyield strength = 190 MPa. The die corner radius = 6 mm. Based on these data, is the operation feasible?
4) In the deep drawing of cups, blanks show a
tendency to wrinkle up around the periphery
(flange). The most likely cause and remedy of the
phenomenon are respectively:
Buckling due to circumferential compression;
Increase blank holder pressure.
High blank holder pressure and high friction;
Reduce blank holder pressure and apply
lubricant.
High temperature causing an increase in
circumferential length; Apply coolant to blank.
Buckling due to circumferential compression;
decrease blank holder pressure.
Chapter 15 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 15 - How does extrusion differ from rolling and...Ch. 15 - Explain the difference between extrusion and...Ch. 15 - What is a spider die? What is it used for?Ch. 15 - Why are wires sometimes drawn in bundles?Ch. 15 - What is a dead-metal zone?Ch. 15 - Define the terms (a) cladding, (b) dummy block,...Ch. 15 - Why is glass a good lubricant in hot extrusion?Ch. 15 - What types of defects may occur in (a) extrusion...Ch. 15 - Describe the difference between direct and reverse...Ch. 15 - What is land? What is its function in a die?
Ch. 15 - How are tubes extruded? Can they also be drawn?...Ch. 15 - Prob. 12RQCh. 15 - What is the difference between piping and...Ch. 15 - What is impact extrusion?Ch. 15 - What is the pipe defect in extrusion?Ch. 15 - List the similarities and differences between...Ch. 15 - Explain why extrusion is a batch, or...Ch. 15 - The extrusion ratio, die geometry, extrusion...Ch. 15 - Explain why cold extrusion is an important...Ch. 15 - What is the function of a stripper plate in impact...Ch. 15 - Explain the different ways by which changing the...Ch. 15 - Glass is a good lubricant in hot extrusion. Would...Ch. 15 - How would you go about avoiding center-cracking...Ch. 15 - Table 15.1 gives temperature ranges for extruding...Ch. 15 - Will the force in direct extrusion vary as the...Ch. 15 - Comment on the significance of metal flow patterns...Ch. 15 - In which applications could you use the type of...Ch. 15 - What is the purpose of the land in a drawing die?...Ch. 15 - Can spur gears be made by (a) drawing and (b)...Ch. 15 - How would you prepare the end of a wire in order...Ch. 15 - What is the purpose of a dummy block in extrusion?...Ch. 15 - Describe your observations concerning Fig. 15.9.Ch. 15 - Occasionally, steel wire drawing will take place...Ch. 15 - Explain the advantages of bundle drawing.Ch. 15 - Under what circumstances would backward extrusion...Ch. 15 - Why is lubrication detrimental in extrusion with a...Ch. 15 - In hydrostatic extrusion, complex seals are used...Ch. 15 - Describe the purpose of a container liner in...Ch. 15 - Estimate the force required in extruding 7030...Ch. 15 - Assuming an ideal drawing process, what is the...Ch. 15 - Prob. 41QTPCh. 15 - Calculate the extrusion force for a round billet...Ch. 15 - Prob. 43QTPCh. 15 - A round wire made of a perfectly plastic material...Ch. 15 - Assume that the summary to this chapter is...Ch. 15 - Prob. 47SDPCh. 15 - Figure 15.2 shows examples of discrete parts that...Ch. 15 - The parts shown in Fig. 15.2 are economically...Ch. 15 - Survey the technical literature, and explain how...Ch. 15 - Prob. 51SDPCh. 15 - List the processes that are suitable for producing...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Differentiate ISOMETRIC DRAWING to OBLIQUE DRAWING.arrow_forward6. You have been consulted to design a draw die system for a wire production facility. The starting diameter is 3.0 mm and velocity is 5 m/s. The final diameter is 1.55 mm. Area reduction in drawing (r) is guided by the formula A, – Af Ao where A,=original area of work and AFfinal area. The upper limits for r are 0.50 for single-draft bar drawing and 0.30 for multiple-draft wire drawing respectively. Sketch the draw die system with all applicable system values/measurements incorporated. Assume no changes in volume due to forming.arrow_forwardIt is proposed to use an axisymmetric drawing operation to reduce the diameter of a cylindrical rod of steel from Do to Do/4. If the steel behaves like a perfectly-plastic material, and there is no redundant deformation or friction in the process, what is the minimum number of drawing stages needed to obtain this reduction?arrow_forward
- 3) Which of the below statements is/are correct regarding deep drawing process? i. If the clearance between the punch and the die is less than the thickness produced by free thickening, the metal in these regions will be squeezed, or ironed. ii. The force on the punch required to produce a cup is the summation of the ideal force of deformation, the frictional forces, and the force required to produce ironing (if present). i only ii only Both i and ii None of the abovearrow_forward4) What is forging? One way to classify forging operations is by the degree to which the work is constrained in the die. By this classification, explain the three basic types. (with using figures also).arrow_forwardA drawing operation is used to form a cylindrical cup with inside diameter of 75 mm and height of 50 mm. The starting blank size is 140 mm and the stock thickness is 2.4 mm. Based on the data, is the operation feasible?arrow_forward
- In a two stage wire drawing operation, the fractional reduction (ratio of change in cross- sectional area to initial cross-section area) in the first stage is 0.4. The fractional reduction in the second stage is 0.3. determine the overall fraction of the operation.arrow_forwardprovide good drawing preferably by softwarearrow_forward7) A steel sheet has R values of 1.0, 1.5, and 2.0 for the 0°, 45° and 90° directions to rolling, respectively. If a round blank is 150 mm in diameter, estimate the smallest cup diameter to which it can be drawn in one draw. (Hint: Use the following equation) Ro + 2R45 + R90 R 4arrow_forward
- what is Deep Drawing?arrow_forwardA deep drawing operation for a cup is performed in which the inside diameter = 60 mm %3D and the height = 50 mm. The blank thickness = 3 mm, and %3D %3D the starting blank diameter = 108 mm. Punch and die radii = %3D 4 mm. Tensile strength = 400 MPa and yield strength = 180 %3D MPa for this sheet metal. Determine (a) drawing ratio, (b) reduction, (c) drawing force, and (d) blankholder force. *arrow_forwardIn .. . the die surfaces contain a .16 shape that is given to the work piece during compression, thus restricting the metal flow significantly. There is some extra-deformed material outside the die impression, which is called as flash. This .will be trimmed off later impression die forgingO flashless forgingO Open die forgingO none of them Oarrow_forward
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