Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 19, Problem 36QLP
Identify processes that would be suitable for small production runs on plastic parts, of, say, 100.
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In a sheet metal forming press, the shape to be formed is hemispherical cup of radius 15 cm in 2mm thick mild
steel sheet. The force required to deform sheet is 8 kN. The forming hammer should approach job from a distance
of 30 cm. The production rate required is 240 components/hr.
Calculate and suggest the following specifications of the various hydraulic components used:
a. Hydraulic cylinder (bore & length);
b. Pump pressure and flow rate;
c. Electric motor HP considering 75% pump efficiency;
d. Reservoir size; and
e. Size of pump inlet and discharge tubing.
• In a sheet metal forming press the shape to be formed is
hemispherical cup of radius 15 cm in 2mm thick mild steel sheet.
The force required to deform sheet is 8 kN. The forming hammer
should approach job from a distance of 30 cm. The production rate
required is 240 components/hr. Calculate and suggest the
following specifications of the various hydraulic components used:
a) Hydraulic cylinder (bore & length)
b) Pump pressure and flow rate
c) Electric motor HP considering 75% pump efficiency
d) Reservoir size
e) Size of pump inlet and discharge tubing
Please solve in 10 min
Chapter 19 Solutions
Manufacturing Engineering & Technology
Ch. 19 - What are the forms of raw materials for processing...Ch. 19 - What is extrusion? What products are produced by...Ch. 19 - Describe the features of an extruder screw and...Ch. 19 - How are injection-molding machines rated?Ch. 19 - What is (a) a parison, (b) a plastisol, and (c) a...Ch. 19 - How is thin plastic film produced?Ch. 19 - List several common products that can be made by...Ch. 19 - What similarities and differences are there...Ch. 19 - Explain the difference between potting and...Ch. 19 - What is thermoforming?
Ch. 19 - Describe runner, gate, sprue, and well.Ch. 19 - Describe the advantages of cold-forming plastics...Ch. 19 - What are the characteristics of filament-wound...Ch. 19 - Describe the methods that can be used to make...Ch. 19 - What is pultrusion? Pulforming?Ch. 19 - How are very thin plastic film produced?Ch. 19 - What process is used to make foam drinking cups?Ch. 19 - If a polymer is in the form of a thin sheet, is it...Ch. 19 - How are polymer fibers made? Why are they much...Ch. 19 - What are the advantages of coextrusion?Ch. 19 - Explain how latex rubber gloves are made.Ch. 19 - Describe the features of a screw extruder...Ch. 19 - Explain why injection molding is capable of...Ch. 19 - Prob. 24QLPCh. 19 - Explain the reasons that some plastic-forming...Ch. 19 - Describe the problems involved in recycling...Ch. 19 - Can thermosetting plastics be used in injection...Ch. 19 - Inspect some plastic containers, such as those...Ch. 19 - An injection-molded nylon gear is found to contain...Ch. 19 - Explain why operations such as blow molding and...Ch. 19 - Prob. 31QLPCh. 19 - Typical production rates are given in Table 19.2....Ch. 19 - What determines the cycle time for (a) injection...Ch. 19 - Does the pull-in defect (sink marks) shown in Fig....Ch. 19 - What determines the intervals at which the...Ch. 19 - Identify processes that would be suitable for...Ch. 19 - Identify processes that are capable of producing...Ch. 19 - Inspect several electrical components, such as...Ch. 19 - Inspect several similar products that are made of...Ch. 19 - What are the advantages of using whiskers a...Ch. 19 - Construct a table that lists the main...Ch. 19 - Estimate the die-clamping force required for...Ch. 19 - A 2-Iitcr plastic beverage bottle is made by blow...Ch. 19 - Consider a Styrofoam drinking cup. Measure the...Ch. 19 - In Fig. 19.2, what flight angle, , should be used...Ch. 19 - Make a survey of a variety of sports equipment,...Ch. 19 - Explain the design considerations involved in...Ch. 19 - Give examples of several parts suitable for insert...Ch. 19 - Give other examples of design modifications in...Ch. 19 - With specific examples, discuss the design issues...Ch. 19 - Die swell in extrusion is radially uniform for...Ch. 19 - Inspect various plastic components in a typical...Ch. 19 - It is well known that plastic forks, spoons, and...Ch. 19 - Prob. 55SDPCh. 19 - Make a survey of the technical literature, and...Ch. 19 - Prob. 57SDPCh. 19 - Prob. 58SDPCh. 19 - Prob. 59SDPCh. 19 - Examine some common and colorful plastic poker...Ch. 19 - Obtain different styles of toothpaste tubes,...Ch. 19 - By incorporating small amounts of blowing agent,...
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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
- Consider the extrusion of a cylindrical billet, and compute the following. Assume the starting billet to have a length of 0.3m and a diameter of 15cm. This is extruded into a cylindrical product that is 3cm in diameter and 7.5cm long. Neglecting the areas on the two ends, compute the ratio between the product surface area (wraparound cylinder) and the surface area of the starting billet. How would this ratio change if the product were a square with the same corss-sectional area as that of the 3cm diameter circle?arrow_forwardA process currently services an average of 59 customers per day. Observations in recent weeks show that its utilization is about 90 percent, allowing for just a 10 percent capacity cushion. If demand is expected to be 70 percent of the current level in five years and management wants to have a capacity cushion of just 4 percent, what capacity requirement should be planned? The needed capacity requirement is nothing customers per day. (Enter your response rounded up to the next whole number.)arrow_forwardGive three examples of engineered products that must be rectangular in shape and explain why.arrow_forward
- Evaluate the different manufacturing processes used to produce a component and recommend the most suitable process based on cost, quality and time constraints.arrow_forwardWhen plastic processing blanks, the blanks undergo a permanent change in shape. Name examples of at least four plastic manufacturing processes.arrow_forwardWhat are the major classes of manufacturing processes? Give examples of hardware produced by casting, rolling, forging, extrusion, and machining. Explain how a bandsaw, drill press, and milling machine are used.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_forward3Aarrow_forwardIn a single-barrel extrusion system, the operator observes that the extrudate (made of polyethylene, PE) is being processed at a speed of 0.5m/s with a final diameter of 0.5cm. The screw pitch is 1cm, the barrel diameter is 1.5cm, the barrel length is 10cm, the screw channel depth is 0.3cm and the screw is rotating at 10RPM. a. Find the head pressure on the die given that the polymer has a viscosity of 300Pa.s. Note that the swell ratio of PE is 1.2. b. Find the length of the die opening.arrow_forward
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