Hauv kev tsim kho tshuaj, qhov roj teeb yog ib qhov cuab yeej tseemceeb uas pab txhim kho qhov chaw sib txuas nrog qhov tsis muaj friction rau qhov cua sov linear lossis thaum twg kuj li qhov cua sov curvilinear ntawm lub carriage, slide, lossis lwm qhov cua sov. Hauv kev tshuaj lij xwm yeem thiab tshuaj, lawv yog qhov tseemceeb rau kev ua haujlwm nrog qhov ceev faj thiab kev sib npaug ntawm kev cua sov linear. Qhov feem ntau tshaj plaws yog qhov roj teeb linear, uas txhawj xeeb nrog lub block bearing ball lossis roller uas rov qab los. Qhov chaw no pab tau rau kev cua sov smooth nrog qhov tsis muaj friction zoo li, thaum kawm tau qhov loj ntau (radial, reverse radial, thiab moment loads). Lub roj teeb yog ib tug shaft stel uas tau raug txias thiab txias nrog cov raceways precision-machined nyob rau hauv nws lub teb. Cov criteria zoo tagnrho rau kev xaiv roj teeb yog nws load capacity, stiffness, accuracy grade (uas qhia txog nws kev parallelism thiab height tolerance), thiab nws kev txaus siab rau corrosion thiab wear. Lawv raug siv hauv txhua qhov chaw sib piv nrog tshuaj tshuaj nyob rau hauv ib tug extrusion line: xyooj faj die, txav lub haul-off caterpillar treads, txav saw cutting, thiab hauv automation uas xaiv cov finished products. Qhov kev ua haujlwm ntawm cov tshuaj no nyob rau hauv kev speed, accuracy, thiab smoothness yog txwv nkaus rau qhov zoo thiab kev siv roj teeb tswj tau. Kev xaiv meej pem ncaj ntawm roj teeb mus rau ib qhov chaw flat thiab rigid nrog torque tau qhia yog qhov tseemceeb rau kev pom qhov kev ua haujlwm thiab service life, ua rau nws yog ib qhov yooj yooj tawg rau kev tsim kho zoo thiab zoo.