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FRAME Typical section view (full scale) showing the EVT frame, diaphragm, and seal. The strip of Interflow rubber inboard of the seal serves to reduce stress on the diaphragm as it transitions from the frame to the mold surface, and it provides a perimeter breathing channel INTERFLOW STRIP DIAPHRAGM MOLD SURFACE Here are two views of a mold that makes a highly contoured part. Note the numerous breaks in the frame to accommodate curves, corners, and TWISTS. Twists, especially a spiraling twist, are difficult to fit a frame to and should be avoided if possible. SEALING SURFACE What about the surface of the mold where the seal takes place? There are a number of possible interference problems when certain things aren’t considered. - Tooling ball holes - Laser projection system reference points - Ply orientation rosettes - Identification engravings or etchings - Hoist ring locations - Bushings for locating secondary drilling tools - A hundred other things The frame and seal of most systems occupy ~2” of area along the perimeter of the mold or fixture. Within the outer .75” to 1” of this 2” margin you can locate tool stampings, markings, tooling ball holes, or anything that doesn’t protrude more than ~.200”. Any higher and you’ll interfere with the frame. Locate them towards the inside of the 2” margin and you’re into the sealing area. You’ll either need to fill the markings and relocate them or the frame and seal will have to be joggled. T-7 SEAL PAGE 8 © 2004 TORR TECHNOLOGIES INCPDF Image | DESIGNING MOLDS AND FIXTURES Vacuum Bagging
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