Rail clips feem ntau yog siv nyob rau hauv railway systems. Nws lub luag haujlwm tseem ceeb yog txhawm rau txuas cov ntsia hlau thiab cov neeg pw tsaug zog, feem ntau yog siv lub zog khaws cia los ntawm elastic deformation ntawm lub caij nplooj ntoos hlav clip kom txo tau cov neeg kho tshuab kev co thiab cuam tshuam lub zog. Nws ua haujlwm nyob rau hauv lub sij hawm ntev thiab cyclical dabtsi yog khoov, nrog rau torsional alternating stresses induced los ntawm dynamic loads, ua hauj lwm nyob rau hauv tsis tshua muaj neeg ua hauj lwm ib puag ncig.
Hauv kev tsim cov clips caij nplooj ntoos hlav, cov khoom siv raw khoom siv yog kub dov caij nplooj ntoos hlav steel. Lub microstructure ntawm lub caij nplooj ntoos hlav clip yuav tsum muaj xws li tempered martensite thiab troostite, nrog rau cov kab ntawm cov ferrite tsis tu ncua tso cai rau hauv cov tub ntxhais. Lub decarburization qhov tob ntawm qhov chaw ntawm lub caij nplooj ntoos hlav clip yuav tsum tsis txhob ntau tshaj 0.3mm. Tom qab 5 lab kev sim qaug zog, lub caij nplooj ntoos hlav clip yuav tsum tsis txhob tawg, thiab qhov seem deformation yuav tsum tsis pub tshaj 1 hli. Cov txheej txheem ntau lawm rau lub caij nplooj ntoos hlav clips suav nrog cov khoom shearing, nruab nrab zaus induction cua sov, kub sib sau, roj quenching, tempering, xeb tiv thaiv kev kho mob, kev soj ntsuam cov khoom tiav, thiab ntim.
Lub ntsiab yog vim li cas rau qhov tsis ua hauj lwm ntawm lub caij nplooj ntoos hlav clips thaum siv yog cov khoom tsis xws luag. Kev ntxhov siab feem ntau tshwm sim ntawm txheej txheej ntawm lub caij nplooj ntoos hlav steel, yog li qhov zoo ntawm lub caij nplooj ntoos hlav steel muaj feem cuam tshuam rau lub zog qaug zog. Kev tawg, tsis xws luag, thiab nti tshwm sim thaum lub sij hawm dov ntawm lub caij nplooj ntoos hlav steel feem ntau yog ib qho laj thawj rau kev qaug zog ntawm lub caij nplooj ntoos hlav clips. Tsis tas li ntawd, metallurgical defects xws li non-metallic inclusions, npuas, folding, element segregation, thiab lwm yam, kuj tuaj yeem ua rau lub sijhawm ua ntej ntawm kev qaug zog tawg ntawm kev sib txuas thiab matrix interface.