The Research On Telescopic Boom Slider Of Interpenetrating Phase Composites For Crane

It is a hot research port to develop new slider materials with good mechanical propertiesand wear resistance used for the crane telescopic boom. Interpenetrating phase composites(IPC) with both nice performance of metal and polymer has got a lot of public’s interest. Afterthe development of guiding sliders at home and abroad is introduced and the researchprogress of IPC is described, the theoretical foundation of metal foam-polymer IPC for theslider is studied and new materials of slider for crane telescopic boom are prepared in thispaper.A new type of IPC was prepared by impregnating open-cell aluminum foam (AF) withpolyoxymethylene (POM) as dispersed phase through an injection molding process. Bymeasuring its bending strength and un-notched charpy impact strength, the injection moldingprocess parameters were optimized by the orthogonal experiment design. The best pre-treatment process for AF were achieved with different concentrations of silane couplingagent (KH550). The mechanical and tribological properties of AF/POM IPC were improvedwith the addition of poly-tetrafluoroethylene (PTFE). The wear mechanism was explored bymeans of energy dispersive X-ray spectroscopy (EDS) and scanning electron microscope(SEM). The static analysis, micro-mechanics analysis and finite-element analysis of thenylon slider and AF/POM IPC slider were done, respectively. The stress and strain diagram oftwo kinds of sliders were studied.Results show that AF/POM IPC has nice mechanical properties, the bending strength ofwhich is almost equal to pure POM and6.3times as high as pure AF. The tribologicalproperties of AF/POM IPC are between the values of AF and pure POM. The frictioncoefficient of IPC decreases with the increasing of the applied load and shows very littlesensitivity to the test speed while the abrasion loss increases with the increasing of load andtest speed. The un-notched charp impact strength of PTFE filled AF/POM IPC are36.1%higher than that of AF/POM IPC. The friction coefficient of modified AF/POM IPC is about12.7%lower than that of AF/POM IPC and the abrasion loss reduces by33.3%. The transferfilm resulted from dispersed phase of polymer may improve the wear resistance of IPC. Themechanical and tribological properties of AF/POM/PTFE IPC are also competitive against thenylon slider material. The friction coefficient of modified AF/POM IPC decreases by49.1%compared with nylon. The maximum strain of AF/POM IPC is27.5%lower than that of nylonon the condition of telescopic boom full-extending and rated lifting weight for the QY16 crane. The contact gap between the slider and telescopic boom is decreased, which improvesthe longevity of the slider. In short, AF/POM IPC has the potential to take place of nylonmaterial for sliders.