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24 Cards in this Set
- Front
- Back
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Centrifugal Finishing
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High speed rotational spinning to deburr, flash removal and degate.
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Advantages of centrifugal finishing.
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No training
Fast cycle times Small footprint Consistant |
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Disadvantages of centrifugal finishing.
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Batch not contin.
Large parts difficult Labor intensive Material limitations |
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* Why is centrifugal finishing not used with thermoplastics?
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They are too ductile.
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* What units are used to measure the strenght of a laser?
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Watts
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* Name advantages of laser machining
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Accurate and precise
No surface finish req. Automatable Detailed cuts Low cost Fast cycle time |
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* Competitive machining techniques for laser machining?
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Etching
Milling EDM Drilling Ultrasonic abrasive techniques |
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Disadvantages to laser machining
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Shock wave damage
High initial investment Gasses discharged Fire potential |
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* In vibratory mass finishing what key aspect keeps the excess material and dull media from clogging up the process?
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Finishing component
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Advantages of water jet cutting
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Wide range of substrates
Good tolerances No heat produced No haz waste No tool changes Small width of cut |
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Disadvantages of water jet cutting
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Maintenance costs
2D Shapes Thick parts loose dimen stability |
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* Name two materials that are suitable for cyrogenically machining.
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Elastomers
Die cast metals |
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* What type of blasting medium is used in cyrogenic deflashing/deburring.
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Polycarbonate pellets (prevent scratching)
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What is cyrogenic machining?
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Parts exposed to liquid nitrogen, then blasted with pellets to deburr.
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Advantages of cyrogenic machining.
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Preserves part quality
Automatable Low cycle times Remove complex flash |
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Disadvantages of cryogenic machining.
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Thickness of flash
Initial equipment cost |
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* What is the difference between UV and IR/convection curing?
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UV directly heats part of the product, convection heats ambient air.
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* Two advantages of UV curing
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Eliminates VOC's
Short cycle time Small foot print Cost effective |
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Disadvantage of UV Curing
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Some paints contain UV inhibitors
Chemical reactions can be set off Shawdoing |
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* Name three obsolete surface treatment techniques.
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Solvent cleaning
Chemical etching Abrasion |
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* What is the main difference between intumescent and ablative coatings?
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Intumescent creates a char layer
Ablative is fire proof |
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* What is the unique characteristic that causes intumescent coating
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Silicone based coating
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* What are the two most important factors in painting?
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Solvent concentration
Clean surfaces |
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* Why is surface energy important in painting?
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Paint will not stick to the substrate if not enough surface energy
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