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Sep 07, 2024
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MFG 452 - Moldmaking Credits: 3 Lecture Hours: 2 Lab Hours: 2 Practicum Hours: 0 Work Experience: 0 Course Type: Voc/Tech The student is presented with the basic fundamentals of plastic mold construction and molding processes. Experienced individuals may contact instructor to gain admittance to this course. Prerequisite: MFG 402 , MFG 403 Competencies
- Explain safety procedures as it applies to molding
- Identify injection molding press controls and safety features
- Operate injection molding press with all guards in place
- Clear the frozen plastic from the mold sprue and nozzle in a safe manner
- Identify molding processes and terminology
- Describe the purpose of a hot runner mold
- Outline the purpose of a compression mold
- State the purpose of a blow mold
- Describe the purpose of a transfer mold
- Explain plastic resins and coloring agents
- Determine whether plastic is thermosetting or thermoplastic
- Identify types and categories of plastic materials
- Calculate piece part shrinkage for a mold
- List characteristics of each plastic resin studied
- Determine best plastic resin utilized for a given product
- Describe resin coloring processes
- Describe methods of drying plastic resins
- Evaluate plastic piece part for common flaws and defects, determine correction necessary
- Identify types of molding presses and capacities
- Describe the function of the screw as it applies to an injection molding press.
- Identify molding press controls such as timers, counters, temperature, and pressure settings
- Describe the capacities that are measured on a injection molding press (platen daylight, clamp pressure, shot size).
- Prepare an injection molding press to trial run a new mold
- Adjust an infection molding press to trial run a new mold
- Apply terminology to the injection mold and mold process
- Describe shrinkage
- Describe parting lines
- Distinguish between a M.U.D. base and a standard purchased mold base
- Detail the function of eject pins and ejection plate
- Explain the cooling process
- Discuss the function of coring material using core pins
- Describe the function of slides, over-locks, and cams incorporated into a mold
- Explain how a sprue is pulled from the mold
- Locate purchased components in vendor catalogs
- Build an injection mold
- Create a piece part for a mold project
- Determine shrinkage for a piece part
- Determine parting line of the piece part
- Determine ejection method and ejection pin placement
- Determine finish requirements on molding surfaces as required by piece part applications, polish as needed
- Calculate cooling requirements
- Determine plastic resin utilized according to piece part characteristics
- Incorporate eject pins into the mold
- Machine runner system into the mold
- Determine draft angles on molding surfaces
- Determine core placement and sizes
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