Standard |
MCA 230 – Mold Design I
Introduces instruction in the design, construction, selection, safe use, and maintenance of molds and equipment. Emphasizes mass production of plastic articles and die cast molds for aluminum and zinc alloys. Topics include: types of plastics; types of molds; mold components and functions; design of runners, gates, and venting systems; and shot and production calculations.
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Competency
Areas |
Hours |
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Types of Plastics |
Class |
5 | |
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Types of Molds |
D. Lab |
0 | |
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Mold Components and Functions |
P. Lab/O.B.I. |
0 | |
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Design of Runners, Gates, and Venting Systems |
Credit |
5 | |
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Shot and Production Calculations |
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Prerequisite/Corequisite: |
MCA 226, MCA 233 | ||
Course Guide |
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Competency |
After completing this
section, the student will: |
Hours | ||
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Class |
D.Lab |
P.Lab/
O.B.I. | ||
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TYPES OF
PLASTICS |
10 |
0 |
0 | |
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Thermosetting vs. thermoplastic |
Explain thermosetting and thermoplastics. |
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Divide lists of polymers into thermosetting and thermoplastics and then into categories of raw materials. |
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Discuss plasticizer, fillers, stabilizers, and reinforcing agents. |
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Discuss addition polymerization and condensation polymerization. |
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Describe monomers, dimers, bi-functional monomers, poly-functional monomers, crosslinked pendant groups, tacticity, isotactic, syndiotactic, and atactic. |
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Application |
Identify types of plastic samples. |
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TYPES OF MOLDS |
15 |
0 |
0 | |
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Elements of mold design |
Describe types and selection of plastic materials. |
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Describe compression, injection, and transfer mold design and operation. |
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MOLD COMPONENTS AND FUNCTIONS |
10 |
0 |
0 | |
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Theory |
Describe parts of mold and mold functions. |
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Explain the methods available to introduce plastic into molds. |
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Explain the parts of common plastic mold types and describe how they are produced. |
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Describe injection molding, vacuum forming, and blow molding setup. |
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DESIGN OF RUNNERS, GATES, AND VENTING |
5 |
0 |
0 | |
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Flow pattern |
Explain the purpose of a gating system. |
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Describe gating system fundamentals and the path material follows from the source mold cavity. |
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Define sprue, runner, gates, and vents. |
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Explain the relation among runners, gates, and vents. |
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SHOT AND PRODUCTION CALCULATIONS |
10 |
0 |
0 | |
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Calculations |
Explain method for calculating projected area, volume, and piece part weight. |
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Explain the impact of the number of cavities on production. |
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Discuss the impact of piece part shrinkage on mold design. |
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Explain the importance of a uniform wall thickness on a piece part. |
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Suggested Resources |
Allyn, E. (1987). Mold design I: For plastic injection.
Woodstock, NY: Allyn Air.
Bhattacharya. (1987). Metal-filled polymers: Properties and
applications. New York: Dekker.
Birley, A. W., et al. (1988). Plastics materials: Properties and
applications (2nd ed.). New York: Chapman & Hall.
Brown, R. L. (1980). Design and manufacture of plastic parts.
New York: John Wiley & Sons.
Calvert, E. (1980). Injection moulding. Philadelphia:
Trans-Atl Phila.
Chkeremisinoff. (1989). Handbook of polymer science and technology:
Performance properties of plastics and elastomers (Vol. 2). New York:
Dekker.
DuBois, J. H., & Pribble, W. I. (1987).
Plastics mold design engineering
handbook (4th ed.). New York: Van Nos Reinhold.
Dym, J. B. (1987). Injection molds and molding (2nd ed.).
New York: Van Nos Reinhold.
Epstein, G., & Schwartz, S. (Eds.).
(1985). Mold design and moldmaking for
plastics products. New York: T-C Pubns CA.
Gastrow, H., & Stoeckhert, K. (1983). Injection molds: One hundred two
designs. New York: Oxford University Press.
Glanvill, A. B., & Denton, E. N. (1965).
Injection-mould design fundamentals.
New York: Industrial Press.
Isayev, I. A. (1987). Injection and compression molding
fundamentals. New York: Dekker.
Johannaber, F. (1983). Injection molding machines: A user's
guide. New York: Oxford University Press.
Menges, G., & Mohren, P. (1986). How to make injection moulds. New York:
Oxford University Press.
Nyborg, R. L. (1990). Plastic injection molding made easy.
Provo, UT: Regal Pubns.
Robinson, J. S. (Ed.). (1981). Plastics molding: Equipment, processes, and
materials. Lake Mary, FL: Polymers and Plastics Tech
Pub.
Rosato, D. V., & Rosato, D. V. (1985). Injection molding handbook. New York:
Van Nos Reinhold.
Rosato, D. V., & Rosato, D. V. (Eds.).
(1989). Blow molding handbook. New
York: Macmillan.
Schwartz, S., & Goodman, S. (1982). Plastics materials and processes. New
York: Van Nos Reinhold.
Society of Plastics Engineers Staff. (1985).
Tooling challenges for the 80's:
Injection molding tooling: Design, materials, methods. New York: Bks Demand
UMI.
Sors, L. (1981). Plastics molds and dies. New York: Van
Nos Reinhold.
Sors, L., & Balazs, I. (1989). Design of plastic moulds and dies. New
York: Elsevier.
Stoeckhert, K. (1983). Mold-making handbook: For the plastics
engineer. New York: Oxford University Press.
T-C Pubns CA. (1981). Proceedings of SPE Pactec '81, August 25-27,
1981, Los Angeles, California. New York: Author.
T-C Pubns CA. (1983). Foams: Molding thermosetting and
thermoplastic structural foam. New York: Author.
T-C Pubns CA. (1983). Injection molding-plastics. New York:
Author.
T-C Pubns CA. (1984). Injection molding machinery and accessories,
1976-January 1985. New York: Author.
T-C Pubns CA. (1984). Injection molding of plastics. New York:
Author.
T-C Pubns CA. (1984). Mold release agents for rubbers and
plastics, 1973-1986. New York: Author.
T-C Pubns CA. (1984). Reaction injection molding of polymers.
New York: Author.
T-C Pubns CA. (1985). Machining processes and properties of
plastics and elastomers, 1973-April 1985. New York:
Author.
Tobin, W. J. (1985). Quality control manual for injection
molding. New York: T-C Pubns CA.