Lub hom phiaj ntawm kev kho vulcanization:
Thaum vulcanization yog siv los tiv thaiv kev sib txhuam hauv cov hmoov metallurgy cov khoom, hlau-raws li roj-impregnated bearings yog feem ntau siv.Sintered roj-impregnated bearings (nrog graphite cov ntsiab lus ntawm 1% -4%) muaj cov txheej txheem tsim khoom yooj yim thiab tus nqi qis.Nyob rau hauv cov ntaub ntawv ntawm PV <18-25 kg·m / cm 2·sec, nws muaj peev xwm hloov bronze, babbitt alloy thiab lwm yam ntaub ntawv los tiv thaiv kev sib txhuam.Txawm li cas los xij, nyob rau hauv kev ua haujlwm hnyav, xws li kev zawv zawg ceev ntawm qhov sib txhuam ntawm qhov chaw thiab qhov chaw loj, qhov hnav tsis kam thiab lub neej ntawm cov khoom sintered yuav sai sai.Txhawm rau txhim kho kev sib txhuam kev ua haujlwm ntawm cov ntxeem tau hlau-raws li kev sib txhuam qhov chaw, txo cov coefficient ntawm kev sib txhuam, thiab ua kom kub ua hauj lwm kom nthuav dav nws cov kev siv, kev kho vulcanization yog ib txoj kev tsim nyog ntawm kev nce qib.
Sulfur thiab sulfides feem ntau muaj qee yam lubricating zog.Hlau sulfide yog ib qho zoo lubricant, tshwj xeeb tshaj yog nyob rau hauv qhuav kev sib txhuam, muaj cov hlau sulfide muaj qaug dab peg tsis kam.
Hmoov metallurgy hlau-raws li cov khoom siv, siv nws cov capillary pores tuaj yeem impregnated nrog ntau tus sulfur.Tom qab cua sov, cov leej faj thiab cov hlau nyob rau saum npoo ntawm qhov pores tuaj yeem tsim cov hlau sulfide, uas sib npaug sib npaug thoob plaws hauv cov khoom thiab ua lub lubrication zoo ntawm qhov sib txhuam thiab tuaj yeem txhim kho kev ua haujlwm ntawm kev txiav.Tom qab vulcanization, kev sib txhuam thiab txiav qhov chaw ntawm cov khoom yog du heev.
Tom qab cov ntxeem tau sintered hlau yog vulcanized, lub luag haujlwm tseem ceeb tshaj plaws yog kom muaj kev sib txhuam zoo qhuav.Nws yog qhov txaus siab rau nws tus kheej cov khoom siv lubricating nyob rau hauv kev ua haujlwm tsis muaj roj (uas yog, tsis muaj roj lossis tsis muaj roj tso cai), thiab nws muaj kev qaug dab peg zoo thiab txo qhov tshwm sim ntawm ncej gnawing.Tsis tas li ntawd, cov yam ntxwv ntawm kev sib txhuam ntawm cov khoom siv no txawv ntawm cov khoom siv los tiv thaiv kev sib txhuam.Feem ntau, raws li qhov tshwj xeeb siab nce, qhov sib txhuam coefficient tsis hloov ntau.Thaum lub siab tshwj xeeb tshaj ib qho nqi, qhov sib txhuam coefficient nce sharply.Txawm li cas los xij, kev sib txhuam coefficient ntawm ntxeem tau sintered hlau tom qab kev kho vulcanization txo qis nrog qhov nce ntawm nws qhov tshwj xeeb siab hauv qhov tshwj xeeb siab ntau.Qhov no yog ib qho tseem ceeb ntawm cov khoom siv los tiv thaiv kev sib txhuam.
Lub sintered hlau-raws li roj-impregnated bearing tom qab vulcanization tuaj yeem ua haujlwm zoo hauv qab 250 ° C.
Vulcanization txheej txheem:
Cov txheej txheem ntawm kev kho vulcanization yog qhov yooj yim thiab tsis xav tau cov cuab yeej tshwj xeeb.Cov txheej txheem yog raws li nram no: muab sulfur nyob rau hauv ib lub crucible thiab sov nws kom yaj.Thaum ntsuas kub ntawm 120-130 ℃, qhov fluidity ntawm sulfur zoo dua nyob rau lub sijhawm no.Yog hais tias qhov kub thiab txias heev, tsis conducive rau impregnation.Cov khoom sintered yuav tsum tau impregnated yog preheated rau 100-150 ° C, thiab ces cov khoom yog immersed nyob rau hauv molten sulfur tov rau 3-20 feeb, thiab cov khoom unpreheated yog immersed rau 25-30 feeb.Nyob ntawm qhov ntom ntawm cov khoom, cov phab ntsa thickness thiab cov nqi immersion yuav tsum tau txiav txim siab lub sij hawm immersion.Lub sij hawm immersion rau tsawg ntom thiab nyias phab ntsa thickness yog tsawg;rov qab.Tom qab leaching, cov khoom raug muab tshem tawm, thiab cov seem sulfur yog drained.Thaum kawg, muab cov khoom impregnated rau hauv lub qhov cub, tiv thaiv nws nrog hydrogen lossis charcoal, thiab kub rau 700-720 ° C rau 0.5 mus rau 1 teev.Thaum lub sij hawm no, cov immersed sulfur reacts nrog hlau los tsim hlau sulfide.Rau cov khoom uas muaj qhov ceev ntawm 6 mus rau 6.2 g / cm3, cov ntsiab lus sulfur yog li 35 mus rau 4% (qhov hnyav feem pua).Cua sov thiab ci yog ua kom cov sulfur rau hauv lub qhov hws ntawm daim ntawv hlau sulfide.
Cov khoom sintered tom qab vulcanization tuaj yeem kho nrog roj immersion thiab tiav.
Daim ntawv thov piv txwv ntawm kev kho vulcanization:
1. Hmoov zeb ncej tes tsho Lub tes tsho ncej yog ntsia ntawm ob qho kawg ntawm ob lub yob, tag nrho ntawm plaub txheej.Lub siab ntawm yob yog 280 kg, thiab qhov ceev yog 700-1000 rpm (P = 10 kg / cm2, V = 2 m / sec).Thawj tin bronze bushing yog lubricated nrog roj slinger.Tam sim no nws yog hloov los ntawm ntxeem tau sintered hlau nrog ceev ntawm 5.8 g / cm3 thiab S cov ntsiab lus ntawm 6.8%.Lub tshuab lubrication qub tuaj yeem siv los hloov cov khoom siv lubrication qub.Tsuas tso ob peb tee roj ua ntej tsav tsheb thiab ua haujlwm tsis tu ncua rau 40 teev.Lub tes tsho kub tsuas yog txog 40 ° C.;Sib tsoo 12,000 kg ntawm hmoov, lub bushing tseem ua haujlwm ib txwm.
2. Lub khob hliav qab rau cov menyuam laum yog cov cuab yeej tseem ceeb rau cov roj drilling.Muaj lub tes tsho zawv zawg zawv zawg rau saum cov roj laum, uas yog nyob rau hauv siab zoo (siab P = 500 kgf / cm2, ceev V = 0.15m / sec.), thiab muaj zog vibrations thiab shocks.
Post lub sij hawm: Lub Xya hli ntuj-12-2021