parting


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parting

Chem a division of a crystal along a plane that is not a cleavage plane
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

parting

[′pärd·iŋ]
(geology)
A bed or bank of waste material dividing mineral veins or beds.
A soft, thin sedimentary layer following a surface of separation between thicker strata of different lithology.
A surface along which a hard rock can be readily separated or is naturally divided into layers.
(metallurgy)
Recovery of gold (or occasionally another metal) from its alloys by a corrosion process.
Zone of separation between cope and drag portions of mold or flask in sand casting.
In sand molding, a composition to facilitate removal of the pattern.
A shearing operation to produce two or more parts from a stamping.
(mineralogy)
Fracturing a mineral along planes weakened by deformation or twinning.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The distance between heaters and parting line should be far enough to prevent any warping or bending of the plate, however, which would produce flash on molded parts.
Figure 3a illustrates a casting in which the cross-sectional area increases moving away from the parting line (located at the top surface of the casting), which forces an undercut into the casting process.
Elford says the core becomes a three-plate structure with springs to force the parting line shut while the back moves to open space for the second shot.
Programs have been developed that automatically configure the parting for a particular component to obtain optimum castability, maximizing parts per mold and optimizing gating and risering requirements.
Jack Tinsley, SIG's 3D applications director, says the process is adept at making complex parts that eliminate failure-prone parting lines, minimize flash, and enhance wall-thickness uniformity in hollow parts.
The CAD model of the finished part can be split along the parting line before scaling up, adding machine stock, core prints, etc.