SEP 2018


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Page 35 of 91

SEPTEMBER 2018 34 CompositesWorld WORK IN PROGRESS resistance, good surface finish, lower weight and increased parts consolidation and functional integration achieved in a single step, thereby eliminating hardware, brackets and secondary opera- tions. And because the matrix is PA 6, it also offers good and broad chemical resistance plus excellent toughness (impact strength). PMH structures are lighter and have far fewer parts (produced in far fewer steps) than comparable sheet-metal structures with the same functionality, yet they have higher mechanicals than a discontinuous fiber-reinforced thermoplastic composite alone. is is particularly helpful in cases where space is limited, and thick wall sections are undesirable. e ability to greatly reduce part Ensuring successful bonds in selective overmolding The key internal structural element is shown in black in the person's right hand beside the clear part with the red handle. The structural elements inside the steel or aluminum tube prevent it from collapsing under the high pressures of the injection molding cycle and help shape/deform the tube to assure a strong bond is achieved between metal and composite. The clear polycarbonate version of the part on the left shows how the steel tube has dimpled under areas with overmolded polymer, locking metal and plastic together. The tube deformation (called dimpling or beading) can be controlled via design of the supporting element. Source | CW / Photo | Peggy Malnati Complete Ultrasonic Systems Integration

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