EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 9780100793439
Author: KALPAKJIAN
Publisher: YUZU
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 20, Problem 28QTP
The extruder head in a fused-deposition modeling setup has a diameter of 1.25 mm (0.05 in.) and produces layers that are 0.25 mm (0.01 in.) thick. If the extruder head and polymer extrudate velocities are both 40 mm/s, estimate the production time for the generation of a 38-mm (1.5-in.) solid cube. Assume that there is a 10-second delay between layers as the extruder head is moved over a wire brush for cleaning.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
In a particular extruder screw the channel depth is 2.4
mm, the screw diameter is 50 mm, the screw speed is 100
rev/min, the flight angle is 17o and the pressure varies
linearly over the screw length of 1000 mm from zero at
entry to 20 MN/m2 at the die entry. The plastic viscosity
was 200 Ns/m2.
· Estimate the operating point for the extruder when it is
combined with an oval die with dimension of 20x 3 mm.
An extruder barrel has a diameter of 4.0 in and an L/D ratio of 28. The screw channel depth = 0.25 in, and its pitch is 4.8 in. It rotates at 60 rev/min. The viscosity of the polymer melt is 100 x 10-4 lb-sec/in2. What head pressure at exit is required to obtain a net volume flow rate of 150 in3/min? Assume that you are extruding 1/2 in PVC pipe (schedule 40) using the conditions above. How long would it take to extrude a 30 foot section? Be sure to note in your solution where you got your dimensions for the PVC pipe.
An 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).
Chapter 20 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 20 - What is the basic difference between additive...Ch. 20 - What is stereolithography?Ch. 20 - What is virtual prototyping, and how does it...Ch. 20 - What is fused-deposition modeling?Ch. 20 - Prob. 5RQCh. 20 - Prob. 6RQCh. 20 - Explain what each of the following means: (a) 3DP,...Ch. 20 - What starting materials can be used in...Ch. 20 - What are the cleaning and finishing operations in...Ch. 20 - Which rapid-prototyping technologies do not...
Ch. 20 - What are the advantages of electron beam melting?Ch. 20 - What is the Keltool process?Ch. 20 - What is a self-replicating machine?Ch. 20 - Which rapid-prototyping operations can produce...Ch. 20 - Which rapid-prototyping operations can produce...Ch. 20 - How can a mold for sand casting be produced using...Ch. 20 - Examine a ceramic coffee cup and determine in...Ch. 20 - How would you rapidly manufacture tooling for...Ch. 20 - Explain the significance of rapid tooling in...Ch. 20 - List the processes described in this chapter that...Ch. 20 - Few parts in commercial products today are...Ch. 20 - Can rapid-prototyped parts be made of paper?...Ch. 20 - Careful analysis of a rapid-prototyped part...Ch. 20 - Why are the metal parts in three-dimensional...Ch. 20 - Make a list of the advantages and limitations of...Ch. 20 - In making a prototype of a toy automobile, list...Ch. 20 - Using an approximate cost of 400 per gallon for...Ch. 20 - The extruder head in a fused-deposition modeling...Ch. 20 - Using the data for Problem 20.28 and assuming that...Ch. 20 - Rapid-prototyping machines represent a large...Ch. 20 - One of the major advantages of stereolithography...Ch. 20 - A manufacturing technique is being proposed that...Ch. 20 - Identify the rapid-prototyping processes described...Ch. 20 - Design a machine that uses rapid-prototyping...Ch. 20 - Because of relief of residual stresses during...Ch. 20 - Prob. 37SDPCh. 20 - Prob. 39SDPCh. 20 - Prob. 40SDP
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
List several uses of the arbor press.
Machine Tool Practices (10th Edition)
Steady state conduction rate to the warm compressor to the net power produces theoretically by thermodynamic ba...
Introduction to Heat Transfer
Three rigid bodies, 2,3, and 4, are connected by four springs as shown in the figure. A horizontal force of 1,0...
Introduction To Finite Element Analysis And Design
What types of polymers are most commonly blow molded?
Degarmo's Materials And Processes In Manufacturing
6–1C A mechanic claims to have developed a car engine that runs on water instead of gasoline. What is your resp...
Thermodynamics: An Engineering Approach
3.3 It is known that a vertical force of 200 lb is required to remove the nail at C from the board. As the nail...
Vector Mechanics for Engineers: Statics
Knowledge Booster
Learn more about
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
- An extruder barrel has a diameter of 110 mm and a length of 3.0 m. The screw channel depth = 7.0 mm, and its pitch = 95 mm. The viscosity of the polymer melt is 105 Pa-s, and the head pressure in the barrel is 4.0 MPa. What rotational speed of the screw is required to achieve a volumetric flow rate of 90 cm3/s?arrow_forwardQuestion 3 The diameter of an extruder barrel is 65 mm and its length is 1.75 m. The screw rotates at 55 rev/min. The screw channel depth is 5.0 mm, and its flight (helix) angle is 18°. The head pressure at the die end of the barrel is 5x10° Pa. The viscosity of the polymer melt is given as 100 Pa-s. Calculate the volume flow rate of polymer in the barrel. The drag flow is given by the equation: Qa = 0.5 n2 D² N d̟ sinp cosp The back pressure flow is given by the equation: Pn D dễ sin²o Qb 127L The details of the extruder screw are given in figure 3.1 W. Perpendicular channel width Helix angle (O) Pitch Channel depth de Axial |light| width Axial channel width Perpendicular fight -Direction of mass flow- Figure 3.1. Schematic illustration of a typical "Archimedean" extruder screw. width Root diameter diameterarrow_forwardQuestion 3 The diameter of an extruder barrel is 65 mm and its length is 1.75 m. The screw rotates at 55 rev/min. The screw channel depth is 5.0 mm, and its flight (helix) angle is 18°. The head pressure at the die end of the barrel is 5x10° Pa. The viscosity of the polymer melt is given as 100 Pa-s. Calculate the volume flow rate of polymer in the barrel. The drag flow is given by the equation: Qa = 0.5 n² D² N d̟ sinp cosp The back pressure flow is given by the equation: Pn D dễ sin²4 Qb 127L The details of the extruder screw are given in figure 3.1 W. channel width Perpendicular Pitch Helix ( p angle () D Channel depth de |Axial |light| width Axial channel width Perpendicular flight -Direction of mass flow- Figure 3.1. Schematic illustration of a typical "Archimedean" extruder screw. width Root diameter diameterarrow_forward
- An extrusion operation produces continuous tubing with outside diameter = 5 cm and inside diameter = 4.25 cm. The extruder barrel has a diameter = 10 cm and length = 3 m. The screw rotates at 50 rev/min; it has a channel depth = 0.63 cm and flight angle = 16°. The head pressure has a value of 2.5 MPa and the viscosity of the polymer melt is 55 Pa-s. Under these conditions, what is the production rate in length of tube/min, assuming the extrudate is pulled at a rate that eliminates the effect of die swell (i.e., the tubing has the same OD and ID as the die profile)?arrow_forward10) Die swell in extrusion is radially uniform for circular cross-sections, but is not uniform for other cross-sections. Recognizing this fact, make a qualitative sketch of a die profile that will produce each of the following extruded polymer: a. square b. triangular a) Describe the features of an extruder screw and comment on their specific functions. b) List the differences between the barrel section of an extruder and that on an injection-molding machine.arrow_forwardConsider an extruder in which the barrel diameter = 4.5 in and length = 11 ft. The extruder screw rotates at 60 rev/min; it has channel depth = 0.35 in and flight angle = 20°. The plastic melt has a shear viscosity = 125 x 10 lb-sec/in'. Determine: (a) Qmax and pmusi (b) the shape factor K, for a circular die opening in which Da = 0.312 in and La = 0.75 in; and (c) the values of Q and p at the operating point.arrow_forward
- 3. A dimension of 225.00 mm is specified for a particular injection moulded component manufactured in ABS. Calculate the corresponding dimension to which the mould cavity should be machined, using the value of shrinkage given in the table below. Typical values of shrinkage for moldings of selected thermoplastics. Shrinkage, mm/mm (in/in) Shrinkage, Plastic Plastic mm/mm (in/in) ABS Polyethylene Polystyrene 0.006 0.025 Nylon-6,6 Polycarbonate 0.020 0.004 0.007 PVC 0.005arrow_forwardReview 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.arrow_forwarda.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_forward
- What are the main parameters that influence the flow of a polymer in an extrusion process? Explain this for 3D FDM printing as well as injection moulding and discuss similarities and differences.arrow_forward1. Injection Molding The gate and runner system that you use to move plastic into an injection molding cavity are critical design parameters. Suppose the polymer material that you are using has a viscosity μ of 950Ns/m² under your processing conditions. Suppose your initial gate and round runner system is 3.5 mm in diameter and approximately 25 mm long. Your part has a volume of approximately 20000 mm³ and a projected area of approximately 1800 mm². Your Engel machine claims that it can melt and deliver material at a rate of 165 cm³/sec. Assume that there is no pressure loss between the mold cavity and the runner system, and none of the clamping force is lost in deforming the molds when they come together. (a) What is shortest injection time for the part? (b) Recall that the equation for Newtonian flow through a round channel is: Pr4 8μL where Q is the flow (m³/s), P is the pressure change (Pa), r is the radius of the channel (m), u is viscosity (Ns/m²), and L is the length of the…arrow_forwardA thin steel disk of an oil separator of 100mm outside diameter is shrunk onto a solid steel shaft of 20mm diameter. The system is to be designed to make sure the disc does not become loose at speeds lower than 100000rev/min. Determine the shrinkage allowance required in order to avoid separation disc and shaft, at a speed of 100000rev/min. For the material assume a Young's Modulus, Poisson Ratio and density of 210GPa, 0.3 and 7850kg/m³ respectively.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
Mechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSON
Thermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEY
Mechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage Learning
Engineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
Polymer Basics; Author: Tonya Coffey;https://www.youtube.com/watch?v=c5gFHpWvDXk;License: Standard youtube license