UHMWPE (Ultra-High Molecular Nyhav Polyethylene) yog hom thermoplastic uas muaj qhov hnyav molecular, uas ua rau nws ruaj khov heev. UHMW feem ntau pom tau tias yog cov khoom hnav-tiv taus, siv rau hauv cov txheej txheem tsim khoom rau bearings, conveyor siv, thiab lub zog.
Hauv tsab xov xwm no, peb yuav tshawb txog cov lus nug: "UHMW puas tuaj yeem tau welded?" Peb yuav tham txog cov txheej txheem vuam, cov khoom ntawm UHMW, thiab cov txheej txheem sib txawv ntawm vuam muaj rau cov khoom siv no.
Properties of UHMWPE
Ua ntej sib tham txog cov txheej txheem vuam, cia peb xub xyuas cov khoom tseem ceeb ntawm UHMW uas cuam tshuam rau kev vuam ntawm cov khoom no. Cov khoom no muaj xws li:
1. Siab Molecular Luj
Raws li tau hais dhau los, UHMWPE muaj qhov hnyav molecular, uas muab nws cov khoom tshwj xeeb. UHMWPE muaj kev tiv thaiv zoo heev, zoo heev cuam tshuam lub zog, qis coefficient ntawm kev sib txhuam, thiab tiv taus tshuaj, dej, thiab UV hluav taws xob.
2. Melting Point
Lub melting point ntawm UHMWPE yog kwv yees li 130 degree (266 degree F). Nws yog ib qho tseem ceeb kom paub txog cov cuab yeej no thaum vuam UHMW kom tsis txhob muaj cov khoom tawg.
3. Tsawg Thermal Conductivity
UHMW muaj cov thermal conductivity tsawg, txhais tau hais tias cov khoom tsis ua kom sov zoo. Cov cuab yeej no tuaj yeem ua rau nws nyuaj rau cua sov cov khoom sib npaug thaum lub sijhawm vuam.
Cov txheej txheem ntawm vuam UHMWPE
Muaj ob txoj hauv kev ntawm vuam UHMWPE: kub roj vuam thiab ultrasonic vuam.
1. Kub Gas Vuam
Cov roj kub kub siv cov roj cua kub kom yaj thiab vuam UHMW ua ke. Thaum lub sij hawm vuam txheej txheem, cov khoom siv UHMWPE yog thawj zaug rhuab nrog cov roj ntws, thiab tom qab ntawd siv lub siab rau cov menyuam los xyuas kom muaj kev ruaj ntseg vuam. Thaum txoj kev no ua tau zoo, nws yuav tsum muaj qhov kub thiab txias ntau yam kom ua tiav.
2. Ultrasonic Vuam
Ultrasonic welding yog ib qho tshiab thiab tshwj xeeb vuam txoj kev. Thaum lub sij hawm ultrasonic vuam txheej txheem, cov khoom UHMWPE yog vibrated ntawm high speeds, ua cua sov uas yuav yaj thiab welding cov khoom ua ke. Txoj kev no yog qhov tseeb dua thiab tsis tshua muaj peev xwm ua rau muaj kev puas tsuaj rau cov khoom siv, ua nws txoj kev nyiam rau qee qhov kev siv.
Vuam tswv yim
Thaum vuam UHMW, muaj ob peb lub tswv yim tseem ceeb kom nco ntsoov:
1. Tsis txhob overheating cov khoom. UHMWPE muaj cov ntsiab lus melting tsawg, yog li nws yuav tsum tau ceev faj thaum vuam kom tsis txhob yaj cov khoom.
2. Siv qhov kub thiab txias tsis tu ncua. Kub roj vuam yuav tsum tau ib tug tshwj xeeb kub thiab siab ntau yam rau ib tug txhim khu kev qha weld. Nws yog ib qho tseem ceeb kom tswj tau qhov tseeb qhov kub thiab txias nyob rau hauv cov txheej txheem vuam.
3. Xaiv txoj hauv kev rau daim ntawv thov. Ob leeg kub roj vuam thiab ultrasonic vuam siv tau los vuam UHMWPE. Txawm li cas los xij, ultrasonic vuam feem ntau yog ntau dua thiab tsawg dua yuav ua rau cov khoom puas tsuaj.
Xaus
Hauv kev xaus, UHMWPE tuaj yeem welded, tab sis nws yuav tsum tau tshwj xeeb cov txheej txheem xws li cov roj kub vuam lossis ultrasonic vuam. Thaum vuam UHMWPE, nws yog ib qho tseem ceeb uas yuav tsum tau ceev faj thiab tswj qhov kub thiab txias kom tsis txhob ua rau cov khoom puas.
UHMWPE yog cov khoom siv ruaj khov, hnav-tiv taus uas muaj kev tiv thaiv zoo heev, tsis tshua muaj coefficient ntawm kev sib txhuam, thiab tiv taus cov tshuaj thiab UV hluav taws xob. Vim nws cov khoom tshwj xeeb, UHMWPE feem ntau siv rau hauv kev tsim cov bearings, conveyor siv, thiab lub zog.
Zuag qhia tag nrho, kev vuam ntawm UHMWPE yuav tsum muaj cov txheej txheem tshwj xeeb thiab kev paub tab sis tau txais txiaj ntsig ntev.
