Permanent Mold Casting
Permanent mold casting is a metal casting process that employs reusable molds ("permanent molds"), usually made from metal. The most common process uses gravity to fill the mold, however gas pressure or a vacuum are also used. A variation on the typical gravity casting process, called slush casting, produces hollow castings. Common casting metals are aluminum, magnesium, and copper alloys. Other materials include tin, zinc, and lead alloys and iron and steel are also cast in graphite molds. Permanent molds, while lasting more than one casting still have a limited life before wearing out.
Read more about this topic: Casting (metalworking), Non-expendable Mold Casting
Famous quotes containing the words permanent, mold and/or casting:
“Most Americans are born drunk, and really require a little wine or beer to sober them. They have a sort of permanent intoxication from within, a sort of invisible champagne.... Americans do not need to drink to inspire them to do anything, though they do sometimes, I think, need a little for the deeper and more delicate purpose of teaching them how to do nothing.”
—Gilbert Keith Chesterton (1874–1936)
“O, what a noble mind is here o’erthrown!
The courtier’s, soldier’s, scholar’s,eye, tongue, sword,
Th’ expectancy and rose of the fair state,
The glass of fashion and the mold of form,
Th’ observed of all observers, quite, quite down!”
—William Shakespeare (1564–1616)
“All we know
Is that we are a little early, that
Today has that special, lapidary
Todayness that the sunlight reproduces
Faithfully in casting twig-shadows on blithe
Sidewalks. No previous day would have been like this.”
—John Ashbery (b. 1927)