Permanent Mold

permanent mold

[′pər·mə·nənt ′mōld]
A reusable metal mold for the production of many castings of the same kind.

Permanent Mold


a metal mold for producing castings, primarily from nonferrous alloys but also from iron and steel when specific technical requirements exist. They are made from iron and steel, and sometimes from other alloys, and are capable of withstanding 100 to 10,000 pourings, depending on the weight and properties of the alloy. The use of permanent molds in series and mass production is economically advantageous.

Permanent molds may be jointless or have one or more joints in the horizontal and vertical planes or a composite parting line, depending on the configuration of the casting. The exterior of the casting is formed by the mold recesses, and the interior by sand and metal casting cores. There are gating system channels in the parting line or sand core for filling the mold with melt. The parts of the mold are usually opened and closed mechanically on special chill casting machines. Special coatings and paints are applied to the surface of the mold’s working parts to increase its durability and reduce the rate of cooling of the castings. Permanent molds coated with a thin layer (up to 0.5 mm) of fine facing sand, binding materials, and water, are used to produce castings of simple configuration, high surface density, and good hermetic qualities. Refractory-lined permanent molds, in which only specially prepared hollows are coated with molding mixture, are used for making large iron and steel castings weighing several tons.


References in periodicals archive ?
Department of Energy funded a number of proposals in 2004 under the Energy Saving Melting and Revert Reduction Technology (E-SMARRT) program, which included a project lead by Canmet Materials (CMAT), Hamilton, Ontario, Canada, on permanent mold casting light metal alloys.
Optimizing Mechanical Properties--New Permanent Test Bar Mold: The project resulted in the development of a new permanent mold test bar mold, which is currently under review for acceptance by the American Society for Testing Standards.
On the Foundry and Diecaster Network on LinkedIn, a member asked, "I am wondering why in gravity permanent mold casting pressed air cooling is most often used and not water cooling, as in high pressure diecasting?
was a healthy, 92-employee sand casting facility that dabbled in low-pressure permanent mold and generated $10 million in sales a year just more than 10 years ago.
spent a large portion of his metalcasting career solving gating puzzles for permanent mold castings.
Most permanent mold tooling is capable of withstanding tens of thousands of cycles before needing replacement, but daily use causes wear and tear that may affect dimensional accuracy and ultimately casting quality.
Metal mold processes, such as permanent mold and diecasting, can typically produce a tighter dimensional range than sand casting.
Oberdorfer, a subsidiary of Advanced Metals Group LLC, provides permanent mold and nobake castings to the oil and gas, HVAC, aviation, aerospace and military markets.

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