EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Chapter 18, Problem 30QTP
Using Example 18.1, calculate (a) the porosity of the dried part if the porosity of the fired part is to be 9% and (b) the initial length, Lo, of the part if the linear shrinkages during drying and firing are 8 and 7%, respectively.
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Explain the extrusion blow molding in detail.
Review Problems
The extrusion die for a polyethylene parison used in blow
molding has a mean diameter of 18.0 mm. The size of the ring
opening in the die is 2.0 mm. The mean diameter of the parison is
observed to swell to a size of 21.5 mm after exiting the die
orifice. If the diameter of the blow molded container is to be 150
mm, determine (a) the corresponding wall thickness of the
container and (b) the wall thickness of the parison.
A flat plate is to be cast in an open mold whose bottom has a square shape of 12.5 cm by 12.5 cm. The
mold is 7.0 cm deep. A total of 350 cm³ of molten aluminum is poured into the mold. Solidification
shrinkage is known to be 6.25%, which is a volumetric contraction, not a linear contraction. Table 7.1
lists the linear shrinkage due to thermal contraction after solidification. If the availability of molten
metal in the mold allows the square shape of the cast plate to maintain its square dimension until
solidification is completed, determine the final dimensions (width and height) of the plate.
Chapter 18 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 18 - Outline the steps involved in processing (a)...Ch. 18 - List and describe the functions of additives in...Ch. 18 - Prob. 3RQCh. 18 - Prob. 4RQCh. 18 - Prob. 5RQCh. 18 - Prob. 6RQCh. 18 - Prob. 7RQCh. 18 - Describe the methods by which sheet glass is made.Ch. 18 - Prob. 9RQCh. 18 - Prob. 10RQ
Ch. 18 - Prob. 11RQCh. 18 - Prob. 12RQCh. 18 - Prob. 13RQCh. 18 - Prob. 14RQCh. 18 - Prob. 15RQCh. 18 - Prob. 16RQCh. 18 - Prob. 17RQCh. 18 - Prob. 18QLPCh. 18 - Describe the differences and similarities in...Ch. 18 - Describe the differences and similarities in...Ch. 18 - Prob. 21QLPCh. 18 - Prob. 22QLPCh. 18 - Prob. 23QLPCh. 18 - Are any of the processes used for making discrete...Ch. 18 - Prob. 25QLPCh. 18 - Explain the phenomenon of static fatigue and how...Ch. 18 - Describe and explain the differences in the manner...Ch. 18 - Is there any flash that develops in slip casting?...Ch. 18 - Prob. 29QLPCh. 18 - Using Example 18.1, calculate (a) the porosity of...Ch. 18 - Prob. 31QTPCh. 18 - List similarities and differences between the...Ch. 18 - Prob. 34SDPCh. 18 - Prob. 35SDPCh. 18 - Prob. 36SDPCh. 18 - Prob. 37SDPCh. 18 - Prob. 38SDPCh. 18 - Prob. 39SDPCh. 18 - Prob. 40SDPCh. 18 - Describe your thoughts on the processes that can...Ch. 18 - Prob. 43SDP
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- 12) Assuming injection molding pressures of 10kpsi, estimate the die clamping force required for injection molding 10 identical 1.5-in.-diameter disks in one die. Assume runner area is 5.0 in?. Discuss the affects of reorienting the disks.arrow_forwardAn extruder has barrel diameter and length of 150 mm and 3.1 m, respectively. The screw rotational speed = 55 rev/min, channel depth = 8 mm, and flight angle = 18°. The plastic melt has a shear viscosity = 175 Pa-s. Determine: (a) the extruder characteristic, (b) the shape factor Ks for a circular die opening with diameter = 4.0 mm and length = 15 mm, and (c) the operating point (Q and p).arrow_forwardThe part shown in Figure is to be pressed from fine copper powders using a compaction pressure of 1000 MPa. Dimensions are milimetres. Determinea) the required press tonnage to perform this operationb) the final weight of the part if the porosity is 15%. Assume shrinkage during sintering can be neglected. (the desity of copper =8,97g/cm3 )arrow_forward
- Why do parts made by blown film extrusion usually have lower ductility and higher yield stress than injection moulded parts from the same polymer?arrow_forwardGKN Sinter Metals Company pressed iron powders using a compaction pressure of 600 MPa to produced a cylindrical bearing which is 70 cm long and has internal and external diameters of 8 cm and 16 cm, respectively. Determine (a) the most appropriate pressing direction, (b) the required press tonnage to perform this operation, and (c) the final weight of the part if the porosity is 12%, given that the density of iron, ρ = 7.87 g/cm3. Assume shrinkage during sintering can be neglectedarrow_forwardAn extrusion operation is used to produce a parison whose mean diameter = 27 mm. The inside and outside diameters of the die that produced the parison are 18 mm and 22 mm, respectively. If the minimum wall thickness of the blow-molded container is to be 0.40 mm, what is the maximum possible diameter of the blow mold?arrow_forward
- a.State and describe the termi. co-extrusion b. Differentiate between single and twin-screw extruders by describing three distinguishing features in each. c. Dealinate three advantages in the application of extrusion cooking.arrow_forwardلانقطة واحدة of Warm working The advantages over cold working are: 1) forces and power are higher,2) more intricate work geometries possible, and 3) need for annealing may be reduced .or eliminated T F Blow molding is an important industrial process for making one- piece hollow plastic parts with thick .walls T Sly The sequence of the Blow Molding is automated and often integrated with downstream operations such .as bottle filling and labeling T لنقطة واحدةarrow_forwardA flat plate is to be cast in an open mold whose bottom has a square shape that is 200 mm by 200 mm. The mold is 40 mm deep. A total of 106 mm3 of molten aluminum is poured into the mold. Solidification shrinkage is known to be 6.0%. The linear shrinkage due to thermal contraction after solidification is 1.3%. If the availability of molten metal in the mold allows the square shape of the cast plate to maintain its 200 mm by 200 mm dimensions until solidification is completed, determine the final dimensions of the plate.arrow_forward
- Granule strength is very important in pressing powders. The force applied to a granule with a radius of 1 mm is 0.5 Newton. Calculate the breaking strength of the granule. b) It is observed that the pressed granules break easily during pressing. Write down the reasons of this situation and what would you take precations to solve this problem? Why? (please write down 3 precautions with reasons). odluckarrow_forwardWhat means product quality ? What characristics does the term product quality include ? 2 - what steps are included in the molding process, list them ?arrow_forward)Design a two-plate mould for the plastic product as shown in Figure with clearlyshowing the feeding system, cooling system and ejector system.arrow_forward
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