SEP 2018


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NEWS 37 assuring a strong bond between metallic and composite mate- rials. is internal element remains in the tube to add structural support. LANXESS reports that the internal ribbed/finned elements can even be designed to be used with perforated steel or aluminum tubes. ese function like the perforations used in conventional PMH technology. To eliminate the need for a second mold, that tool can be designed to include space in a side cavity to mold structural elements for tubes to be used in the next shot while it overmolds a given tube reinforced with structural elements. And the whole process report- edly can be fully automated, if desired. Compared with conventional PMH structures, with stamped or stamped- plus-welded substructures, HPH struc- tures are said to offer higher torsional stiff- ness and strength and better dimensional stability at comparable cross-section, mass and thickness, yet they still provide all the classic benefits of LANXESS' original PMH process. What's next? Target HPH applications include hybrid composite/metal structures with high mechanical demands that include not only cross-car beams but also car seat frames and front-end modules, truck tailgates and mirror brackets. Outside the automotive arena, it could be used to produce furniture, ladders or even baby strollers. Too new to have established commercial applications yet, HPH is said to be a part of many developmental projects in the works and LANXESS says it continues to evaluate opportunities, and reports it is still working on some technology releases to complete its patent application, which will be submitted later this year. What might be next for HPH? LANXESS also says it has previously done PMH research using PA 6/6 and polybutylene terephthalate (PBT) matrices and carbon fiber reinforcement, and even has evalu- ated magnesium substructures, although the vast majority of commercial applica- tions remain in GR-PA 6 with glass loading levels of 30-60%. eoretically the same material combinations could be used for HPH, although the team's focus remains on 60% GR-PA 6. If carbon fiber rein- forcement was used, metal substructures Contributing writer Peggy Malnati covers the automotive and infrastructure beats for CW and provides communications services for plastics- and composites-industry clients. would need to be isolated (likely via a coating) to prevent galvanic corrosion. Or, for less structural applications, it should be possible to use a tube extruded or pultruded from a plastic or composite. BE THE BEST. OWN THE BEST. 1-800-CALL-CMS WWW.CMSNA.COM Hollow-profile Hybrids

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