pre-warping a plastic part in the tool<?>
pre-warping a plastic part in the tool<?>
(OP)
I am curious if any of you have ever heard of someone pre-warping a part in the tool. For example if you have a part that you want to lay flat and the fasteners are in from the edges, and its supported around the perimeter, if you mold it pre-warped(bowed in) then it may be more likely to stay flat when the fasteners suck it down, tensioned by the perimeter support.
Have any of you seen this done? Think it would work?
Have any of you seen this done? Think it would work?






RE: pre-warping a plastic part in the tool<?>
For instance, I have warped a part to get it _out_ of a mold. This part had severe undercuts that would otherwise require a collapsible core, but I didn't have the budget for that. I put some back taper on the undercuts so the part would spread out as it was ejected. The first few parts in a run typically cracked or fractured, but once the mold was warmed up, the parts deformed, well, plasically. The molder put a rubber band around the hot parts to deform them back to the intended shape, and once they cooled, they were just fine.
There is a trick to getting away with stuff like that. Don't ask us; ask your molder. They absolutely _love_ doing "impossible" stuff.
Mike Halloran
Pembroke Pines, FL, USA
RE: pre-warping a plastic part in the tool<?>
RE: pre-warping a plastic part in the tool<?>
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Jason Williams
K Development, Inc.
RE: pre-warping a plastic part in the tool<?>
Cheers,
Carl