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FURTHER DISCUSSION, REVIEW, MORE EXAMPLES Try and avoid extending certain part contours into the sealing flange. Extending a step or joggle into the excess area might not be a concern if all you plan on using is conventional bag sealant that adheres aggresively to the mold, but a sharp step for a reusable system means grinding the radii so they’re rounded or adding tooling compound or weld to fill sharp radii. It adds cost and requires a little more precision when locating the EVT. Here’s a tip we tell every tool designer: Imagine YOU have to build a frame to fit the tool you’re designing using square aluminum tube. Look at each transition, including elevation changes, outside and inside corners, compound joints, curvature, etc. You’ll start to realize how making small minor contour changes will greatly affect the labor involved for making a frame and diaphragm. The seal will be easier to manufacture and align on the tool surface, and replacement diaphragms will be less costly to make and install. Outline of part (dashed line) is overlayed in this photo. Note how the contour breaks fairly sharply upwards and out to form an elevated flange. This added cost to the mold and dramatically increased the cost of building the frame and seal. Also note how contours are extended to the end of the mold, creating difficult contours for a tube frame and seal to follow. Here’s an end view of the same mold showing the complex frame construction to accommodate the mold curves. Not only was the mold made unnecessarily complex, but this particular end of the mold was also angled in the curved area, similar to slicing a cylinder at an angle. Imagine having to curve a square tube to fit this contour. The result ends up being a spiral section. Although this mold has some complex geometry, the actual perimeter was relatively easy to accommodate. We advised the customer on how to design the mold flange and not extend some of the part contours. Inside and outside radii were rounded to at least .5”, and frame construction was straightforward. Note the extended edge to accommodate the hinges. This is a good example of how a fairly complex mold can be designed to keep construction costs of an EVT as low as possible. PAGE 7 © 2004 TORR TECHNOLOGIES INCPDF Image | DESIGNING MOLDS AND FIXTURES Vacuum Bagging
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