Flash (manufacturing): Difference between revisions
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Revision as of 00:46, 16 April 2011
Flash, also known as flashing, is excess material attached to a molded, forged, or cast product, which must usually be removed. This is typically caused by leakage of the material between the two surfaces of a mold (beginning along the parting line[1]) or between the base material and the mold (in the case of overmolding). Molding flash is seen when the optimized parameter on cull height is not calibrated[citation needed]. Proper design of mold parting surfaces can reduce or eliminate flash[2]
Flash is commonly removed on metal workpieces by cutting, breaking, grinding, or tumbling. Some foundries use robot autogrinders to remove this unwanted material.
Witness mark
In plastic injection, a faint mark called witness mark (or witness line) will ocour along the parting line.[1] This is unavoidable and is usually accepted despite minor aesthetics issue. However, some part surfaces (e.g. when used for sealing[3]) cannot tolerate witness mark, and thus either the mark must be removed post-molding or the mold redesigned.
References
- ^ a b David Kazmer (2007). Injection mold design engineering. Hanser Verlag. p. 70. ISBN 9781569904176. Retrieved 15 April 2011.
- ^ "NX I-deasVGX Core/Cavity" (PDF). Siemens PLM Software. 2007. Retrieved 2009-07-01. [dead link]
- ^ US patent 6939500, Bernard, Edward Helmut, "Method and apparatus for eliminating a parting line witness mark from a molded part", issued 2005-09-06
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