ings are environmentally friendly, enabling non-toxic waste disposal. Powder coatings for die cast- ings produce a durable, uniform surface finish, from matte to semi-gloss, available in a range of surface textures. Custom colors can be formulated at extra cost. Powder coating is the only
Fig. 6. The addition of cast-in surface textures, as in this internal frame, can aid smooth fi lling of the die cavity.
masks must be applied during finish ing production and later removed. Costs are propor- tional to part complexity and the resulting masking required. Unique to diecast parts, special fixtures mated to the die cast-
ings can be constructed, in the case of longer finishing runs and those parts suited to such fixturing. If feasible, such fixture masks can reduce finishing production costs. Painting (Powder or Liquid): Non-solvent-based powder coat-
recommended painting process for die castings operating in the field at temperatures above 300F (149C). Custom formulations are available to enable maintenance of coating integrity at even higher operating temperatures. Polyurethane and other wet
paint chemistries are the most com- mon fi nal color fi nishes for die cast components, and have now been joined by water-based wet paints. Finishes from matte to high-gloss are available. Total production costs and lead
Michigan Wisconsin China England India
FIRST TIME… EVERY TIME.
BETTER PARTS THE Applied Process Inc. clocks the competition.
With so much riding on your parts, you simply don’t have time for inferior-performing solutions. As the industry leader in providing austempered ductile iron (ADI), Applied Process develops parts that meet the most stringent industry standards…time and time again. ADI parts are stronger, lighter, quieter, more uniform and have greater wear- resistance—providing increased performance with decreased production costs. It’s time to put the power of Applied Process to work for you.
times for most liquid paints are lower than for powder coating, especially for short production runs, particularly those projects requiring a custom formulation. Electro-deposition of a metal- lic coating on a die casting can provide the most attractive, durable and wear- and corrosion-resistant fi nish of any surface treatment, at proportionately added cost. While die castings off er excellent built-in EMI-RFI shielding as cast, internal board design sometimes indicates additional plating to achieve maxi- mum possible shielding protection. Considering all that a diecast
component must go through after the molten metal solidifi es, pur- chasers and designers should work with casting suppliers early in the process to ensure parts move effi ciently from the early stages of design through casting and post- casting processing. T e fi nal results will be higher quality, lower cost castings—something every casting purchaser strives for. ■
APPLIED PROCESSINC TM
Global Leader in Austempering
www.appliedprocess.com
38 | METAL CASTING DESIGN & PURCHASING | Nov/Dec 2015
T is article is based on “T e OEM Quick Guide to Surface Finishing" from Chicago White Metal Casting Inc., available at
www.cwmdiecast.com.
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