Ⅰ.Isishwankathelo
Kwizityalo zamandla ashushu, iisistim zepetrochemical, ulwelo oluphezulu-viscosity kwishishini lemichiza yamalahle, ulwelo oluxutywe nothuli kunye namasuntswana aqinileyo, kunye nolwelo olunokutya okugqithisileyo, iivalvu zebhola kufuneka zisebenzise iivalvu zebhola ezitywinwe nzima, ngoko ke khetha intsimbi efanelekileyo etywinwe kalukhuni. iivalve zebhola.Inkqubo yokuqina kwebhola kunye nesihlalo sevalve yebhola ibaluleke kakhulu.
Ⅱ.Indlela yokuqina yebhola kunye nesihlalo sentsimbi yevalve yebhola etywiniweyo
Okwangoku, iinkqubo eziqhelekileyo ezisetyenziswayo zokuqina kumphezulu wentsimbi yokutywina iibhola zevalve yebhola ikakhulu ziquka oku kulandelayo:
1 i-welding yokubeka i-surfacing kulula ukukhubaza iindawo.Inkqubo yokuqina kwetyala isetyenziswa kancinci rhoqo.
(2) Umphezulu we-sphere ufakwe nge-chrome enzima, ubunzima bunokufikelela kwi-60-65HRC, kwaye ubukhulu bu-0.07-0.10mm.Uluhlu lwe-chrome-plated lunobunzima obuphezulu, ukuxhathisa ukugqoka, ukuxhathisa kwe-corrosion kunye nokugcina ubuso obukhanyayo ixesha elide.Inkqubo ilula ngokwentelekiso kwaye ixabiso liphantsi.Nangona kunjalo, ukuqina kwe-chrome plating buya kuncipha ngokukhawuleza ngenxa yokukhululwa koxinzelelo lwangaphakathi xa ubushushu bonyuka, kwaye iqondo lokushisa elisebenzayo alinakuba ngaphezulu kwe-427 °C.Ukongeza, amandla okubopha kwi-chrome plating layer aphantsi, kwaye i-plating layer ilungele ukuwa.
(3) Umphezulu we-sphere wamkela i-plasma nitriding, ubunzima bomhlaba bunokufikelela kwi-60 ~ 65HRC, kwaye ubukhulu be-nitride layer yi-0.20 ~ 0.40mm.Ngenxa yokunganyangeki kwe-corrosion yenkqubo yokwenza lukhuni yonyango lwe-plasma nitriding, ayinakusetyenziswa kwiinkalo zemichiza eyomeleleyo ye-corrosion.
4Ukutshiza kwe-HVOF yeyona ndlela yenkqubo yokuqina komphezulu we-sphere.Le nkqubo yokuqina isetyenziswa kakhulu kwizityalo zamandla ashushu, iinkqubo zepetrochemical, ulwelo lwe-viscosity ephezulu kushishino lweekhemikhali zamalahle, ulwelo oluxubeneyo nothuli kunye namasuntswana aqinileyo, kunye nolwelo oludla kakhulu.
Inkqubo yokutshiza ye-supersonic yindlela yenkqubo apho ukutshiswa kwe-oxygen fuel kuvelisa i-air-speed-speed-airflow ukukhawuleza i-particle powder particles ukubetha umphezulu wecandelo ukwenza i-coating surface coating.Ngethuba lenkqubo yempembelelo, ngenxa yesantya se-particle ngokukhawuleza (500-750m / s) kunye neqondo lokushisa eliphantsi (-3000 ° C), amandla okubambisana okuphezulu, i-porosity ephantsi kunye nomxholo ophantsi we-oxide unokufumaneka emva kokubetha ubuso benxalenye. .ukutyabeka.Uphawu lwe-HVOF kukuba isantya se-alloy powder particles sidlula isantya sesandi, nokuba i-2 ukuya ku-3 isantya sesandi, kunye nesantya somoya siphindwe ka-4 kwisantya sesandi.
I-HVOF iteknoloji entsha yokucubungula, ubukhulu be-spray yi-0.3-0.4mm, i-coating kunye necandelo liboshwe ngomatshini, amandla okudibanisa aphezulu (77MPa), kunye ne-coating porosity iphantsi (<1%).Le nkqubo inobushushu obuphantsi bokufudumeza kwiindawo (<93 ° C), iindawo azikhubazeki, kwaye zinokutshizwa ngokubanda.Xa utshiza, i-powder particle velocity iphezulu (1370m / s), akukho ndawo echaphazelekayo yokushisa, ukubunjwa kunye nesakhiwo samalungu asitshintshi, ukuqina kokugqoka kuphezulu, kwaye kunomatshini.
Ukutshiza i-welding yinkqubo yonyango yokutshiza nge-thermal kumphezulu wezinto zetsimbi.Ifudumeza umgubo (umgubo wesinyithi, umgubo wealloyi, umgubo weceramic) kwindawo enyibilikisiweyo okanye ephezulu yeplastiki ngomthombo wobushushu, emva koko uwutshize ngokuhamba komoya kwaye uwubeke kumphezulu wenxalenye enyangwe ngaphambili ukwenza umaleko umphezulu wenxalenye.(I-Substrate) idibaniswe ne-coating eqinile (welding) umaleko.
Kwi-spray welding kunye nenkqubo yokuqina kwe-surfacing, zombini i-carbide ene-cemented kunye ne-substrate inenkqubo yokunyibilika, kwaye kukho indawo eshushu yokuncibilika apho i-carbide ene-cemented kunye ne-substrate idibana khona.Indawo yindawo yokudibanisa isinyithi.Kunconywa ukuba ubukhulu be-carbide ene-cemented bube ngaphezu kwe-3mm ngokutshiza i-welding okanye i-surfacing.
Ⅲ. Ukuqina komphezulu woqhagamshelwano phakathi kwebhola kunye nesihlalo sevalve yebhola etywiniweyo
Intsimbi yokudibanisa i-sliding surface kufuneka ibe nobunzima obuthile, ngaphandle koko kulula ukubangela ukubanjwa.Kwisicelo esisebenzayo, umahluko wobulukhuni phakathi kwebhola yevalve kunye nesihlalo sevalve ngokuqhelekileyo yi-5-10HRC, eyenza ukuba ivalve yebhola ibe nobomi obungcono benkonzo.Ngenxa yokucutshungulwa okuntsonkothileyo kwesphere kunye neendleko eziphezulu zokusetyenzwa, ukuze kukhuselwe i-sphere kumonakalo kunye nokuguga, ukuqina kwesphere ngokuqhelekileyo kuphezulu kunobulukhuni bomphezulu wesihlalo sevalve.
Kukho iindidi ezimbini zokudityaniswa kobulukhuni ezisetyenziswa ngokubanzi kukuqina komphezulu woqhagamshelwano webhola yevalvu kunye nesitulo sevalvu: ①Ubulukhuni bomphezulu bebhola yevalve yi-55HRC, kwaye umphezulu wesitulo sevalve yi-45HRC.I-alloy, lo mdlalo wobulukhuni ngowona mlinganiso wobulukhuni osetyenziswa ngokubanzi kwiivalvu zebhola ezitywinwe ngentsimbi, ezinokuhlangabezana neemfuno eziqhelekileyo zokunxiba iivalve zebhola ezitywinwe ngentsimbi;②Ukuqina komphezulu webhola yevalvu yi-68HRC, umphezulu wesihlalo sevalvu yi-58HRC, kwaye umphezulu webhola yevalvu unokutshizwa nge-supersonic tungsten carbide.Umphezulu wesihlalo sevalve unokwenziwa nge-Stellite20 alloy ngokutshiza nge-supersonic.Obu bunzima busetyenziswa ngokubanzi kwishishini lemichiza yamalahle kwaye inokumelana nokunxiba okuphezulu kunye nobomi benkonzo.
Ⅳ.Epilogue
Ibhola yevalve kunye nesihlalo sevalve yentsimbi evaliweyo yentsimbi ithatha inkqubo yokuqina enengqiqo, enokuthi inqume ngokuthe ngqo ubomi benkonzo kunye nokusebenza kwevalve yentsimbi yokutywina, kunye nenkqubo efanelekileyo yokuqina inokunciphisa iindleko zokuvelisa.
Ixesha lokuposa: Oct-26-2022