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2nd May 2018, 06:28 AM
#1
dimensional increase after molding - PPO
Dear Friends
I am molding a component , material is PPO 30% glass filled. component is like washer but big in size. thickness is 7 mm, outer Dia is 770 mm , inner Dia is 440 mm . shot weight is 2.4 kgs. direct sprue & spoke gates are given in the center processing temperature of around 290 to 300 degree is maintained as specified by material manufacturer . cooling is 45 seconds. circular cooling channels are given in at bottom of core & cavity insert. 800 ton machine is used. a fixture has been used to clamp on both sides of the component to avoid warpage after the component is taken out from the mold.
the problem is component thickness is increasing by 0.5 mm after taking out from the mold ( 7.5 mm ) & also warpage of around 1.8 mm in thickness & twisting is occurring. it iwll be helpfull if somebody can suggest a suitable remedy
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