HW 5
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School
University of Pittsburgh *
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Course
1054
Subject
Industrial Engineering
Date
Feb 20, 2024
Type
Pages
2
Uploaded by ElderGuineaPigMaster1063
Pgs. 245-247: 9.3, 9.8
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Pg. 252: 9.12
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Traditional IE Charting and Diagramming Techniques
9.3
A foundry uses the following steps in its procedure for high production of investment casting process: (1) Produce wax patterns by injection molding. (2) Transport wax patterns to an assembly work area where they are manually assembled to a wax sprue forming a pattern tree. The entire tree is made of wax. (3) Move pattern tree to a separate room where the tree is coated with a thin layer of refractory material. (4) In the same room, coat tree with successive layers of refractory material to make it a rigid structure that will become the mold for casting.(5) Move tree to a furnace room, where it should be held in an inverted position and heated to melt the wax out of the mold cavities. With the wax removed, the rigid structure is now a multiple-cavity mold with runners leading to each cavity from the sprue cavity. (6) In the same furnace room, heat the mold to a high temperature to ensure that all contaminants are removed from the mold. (7) With the mold still heated at an elevated temperature and in an upright orientation pour the molten metal into the sprue; metal will flow through the runners to each cavity. (8) After the metal cools and solidifies move the assemblage to a finishing room; the mold can be broken away from the cast metal and the parts separated from the runners and sprue. Assignment: (a) Develop the flow process chart for this casting process. (b) Based on your flow process chart, what are some changes in the investment casting procedure that you would recommend?
In order to remove the movement procedures, merge all rooms into one and create stations for each specific roles/procedures. Include an procedure for inspection and storages since they are not in the investment casting procedures.
b)
9.8
Consider the allocation of time between the right hand and left hand in the activity chart shown in Figure 7 in the text. (a) If the workplace were redesigned using a workholding fixture, and the worker were trained to use both hands simultaneously to perform the task, construct a right-hand/left-hand activity chart for the revised method, estimating the amounts of time for each step in the method. (b) What is the percent reduction in cycle time?
HW 5
Thursday, February 15, 2024
12:48 AM
HW Page 1
a)
Process Mapping
9.12
Develop a relationship map for the machinery components factory described in Problem 4.
HW Page 2
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