Ⅰ.Txheej txheem cej luam
Nyob rau hauv thermal fais fab nroj tsuag, petrochemical systems, high-viscosity kua nyob rau hauv lub thee chemical kev lag luam, sib tov kua nrog plua plav thiab khoom hais, thiab corrosive heev, pob li qub yuav tsum tau siv hlau hard-sealed pob li qub, yog li xaiv tsim nyog hlau hard-sealed. pob li qub.Cov txheej txheem hardening ntawm lub pob thiab lub rooj zaum ntawm lub pob valve yog qhov tseem ceeb heev.
Ⅱ.Hardening txoj kev ntawm lub pob thiab lub rooj zaum ntawm hlau hard-sealed pob valve
Tam sim no, feem ntau siv cov txheej txheem hardening rau saum npoo ntawm cov hlau nyuaj sealing pob valve pob feem ntau suav nrog cov hauv qab no:
(1) Hard alloy surfacing (los yog tsuag welding) nyob rau saum npoo ntawm tus kheej, lub hardness yuav ncav cuag ntau tshaj 40HRC, cov txheej txheem surfacing ntawm hard alloy ntawm tus kheej nto yog nyuaj, ntau lawm efficiency yog tsawg, thiab loj-chaw. surfacing welding yog ib qho yooj yim rau deform qhov chaw.Cov txheej txheem ntawm rooj plaub hardening yog siv tsawg zaus.
(2) Qhov saum npoo ntawm tus kheej yog plated nrog nyuaj chrome, hardness tuaj yeem ncav cuag 60-65HRC, thiab thickness yog 0.07-0.10mm.chrome-plated txheej muaj siab hardness, hnav tsis kam, corrosion kuj thiab tuaj yeem ua kom lub ntsej muag ci rau lub sijhawm ntev.Cov txheej txheem yog qhov yooj yim thiab tus nqi qis.Txawm li cas los xij, qhov nyuaj ntawm cov tawv chrome plating yuav txo qis sai vim qhov kev tso tawm ntawm kev ntxhov siab sab hauv thaum kub nce, thiab nws qhov ua haujlwm kub tsis tuaj yeem siab dua 427 ° C.Tsis tas li ntawd, lub zog sib txuas ntawm chrome plating txheej yog tsawg, thiab txheej txheej plating yog nquag poob.
(3) Qhov saum npoo ntawm tus kheej tau txais cov ntshav nitriding, qhov tawv tawv tuaj yeem ncav cuag 60 ~ 65HRC, thiab lub thickness ntawm nitride txheej yog 0.20 ~ 0.40mm.Vim qhov tsis zoo corrosion kuj ntawm cov txheej txheem plasma nitriding hardening, nws tsis tuaj yeem siv rau hauv cov tshuaj muaj zog corrosion.
(4) Cov txheej txheem supersonic txau (HVOF) rau ntawm qhov chaw ntawm lub ntsej muag muaj qhov nyuaj txog li 70-75HRC, lub zog sib sau ua ke siab, thiab tuab ntawm 0.3-0.4mm.HVOF txau yog cov txheej txheem tseem ceeb rau kev ua kom tawv nqaij ntawm tus kheej.Cov txheej txheem hardening no feem ntau yog siv rau hauv thermal fais fab nroj tsuag, petrochemical systems, high-viscosity kua nyob rau hauv lub thee chemical kev lag luam, sib tov kua nrog plua plav thiab khoom hais, thiab corrosive heev.
Cov txheej txheem supersonic txau yog txheej txheem txheej txheem uas cov roj combustion ntawm cov pa oxygen ua rau cov cua nrawm nrawm kom nrawm cov hmoov hmoov los tsoo lub ntsej muag ntawm cov khoom siv los ua cov txheej txheej tuab.Thaum cov txheej txheem cuam tshuam, vim qhov nrawm nrawm (500-750m / s) thiab qhov kub tsis tshua muaj siab (-3000 ° C), lub zog sib txuas siab, tsis tshua muaj porosity thiab cov ntsiab lus oxide tsawg tuaj yeem tau txais tom qab tsoo ntawm qhov chaw. .txheej.Cov yam ntxwv ntawm HVOF yog tias qhov ceev ntawm cov hmoov hlau hmoov ntau tshaj qhov ceev ntawm lub suab, txawm tias 2 mus rau 3 npaug ntawm lub suab nrawm, thiab huab cua tshaj tawm yog 4 npaug ntawm qhov ceev ntawm lub suab.
HVOF yog cov txheej txheem tshiab, cov tshuaj tsuag tuab yog 0.3-0.4mm, cov txheej thiab cov khoom sib txuas yog cov khoom sib txuas, lub zog sib txuas yog siab (77MPa), thiab txheej porosity tsawg (<1%).Cov txheej txheem no muaj qhov kub tsis tshua muaj cua sov rau qhov chaw (<93 ° C), qhov chaw tsis deformed, thiab tuaj yeem txau txias.Thaum txau, cov hmoov nplej siab tshaj plaws yog siab (1370m / s), tsis muaj qhov cuam tshuam los ntawm tshav kub, muaj pes tsawg leeg thiab cov qauv ntawm cov khoom tsis hloov, txheej txheej hardness siab, thiab nws tuaj yeem ua machined.
Txau welding yog txheej txheem thermal txau rau ntawm cov khoom siv hlau.Nws heats cov hmoov (hlau hmoov, alloy hmoov, ceramic hmoov) mus rau lub molten los yog siab yas lub xeev los ntawm ib tug tshav kub qhov chaw, thiab ces sprays nws los ntawm huab cua ntws thiab tso rau saum npoo ntawm lub pre-kho ib feem los tsim ib txheej nrog. qhov chaw ntawm qhov chaw.(Substrate) ua ke nrog lub zog txheej (welding) txheej.
Nyob rau hauv cov txheej txheem tshuaj tsuag welding thiab surfacing hardening txheej txheem, ob qho tib si cemented carbide thiab cov substrate muaj cov txheej txheem melting, thiab muaj qhov kub melting cheeb tsam uas cov cemented carbide thiab substrate sib ntsib.Cov cheeb tsam yog cov hlau tiv thaiv nto.Nws raug pom zoo tias lub thickness ntawm cov cemented carbide yuav tsum muaj ntau tshaj 3 hli los ntawm cov tshuaj tsuag welding los yog surfacing.
Ⅲ. Hardness ntawm qhov sib cuag ntawm lub pob thiab lub rooj zaum ntawm lub pob valve nyuaj
Cov hlau zawv zawg qhov chaw yuav tsum muaj qhov sib txawv hardness, txwv tsis pub nws yooj yim ua rau qaug dab peg.Hauv kev siv tswv yim, qhov sib txawv ntawm qhov sib txawv ntawm lub pob valve thiab lub rooj zaum valve feem ntau yog 5-10HRC, uas ua rau lub pob valve kom muaj kev pabcuam zoo dua.Vim yog kev ua haujlwm nyuaj ntawm tus kheej kheej thiab cov nqi ua haujlwm siab, txhawm rau tiv thaiv lub ntsej muag los ntawm kev puas tsuaj thiab hnav, qhov nyuaj ntawm lub kheej kheej feem ntau siab dua qhov hardness ntawm lub rooj zaum valve.
Muaj ob hom kev sib txuas ua ke uas tau siv dav hauv kev sib cuag ntawm lub pob valve thiab lub rooj zaum valve: ①Qhov tawv tawv ntawm lub pob valve yog 55HRC, thiab qhov chaw ntawm lub rooj zaum valve yog 45HRC.Alloy, qhov kev sib tw hardness no yog qhov siv dav tshaj plaws hardness match rau hlau-sealed pob li qub, uas tuaj yeem ua tau raws li cov kev cai coj los siv ntawm cov hlau kaw pob li qub;②Qhov nyuaj ntawm lub pob valve yog 68HRC, qhov saum npoo ntawm lub rooj zaum valve yog 58HRC, thiab lub pob valve tuaj yeem txau nrog supersonic tungsten carbide.Qhov saum npoo ntawm lub rooj zaum valve tuaj yeem ua los ntawm Stellite20 alloy los ntawm supersonic txau.Qhov hardness no yog siv dav hauv kev lag luam thee chemical thiab muaj kev hnav tsis kam thiab kev pabcuam lub neej.
Ⅳ.Epilogue
Lub pob valve thiab lub rooj zaum ntawm cov hlau hardening pob valve txais yuav cov txheej txheem hardening tsim nyog, uas tuaj yeem txiav txim siab ncaj qha rau lub neej kev pabcuam thiab kev ua haujlwm ntawm cov hlau hardening valve, thiab cov txheej txheem hardening tsim nyog tuaj yeem txo cov nqi tsim khoom.
Post lub sij hawm: Oct-26-2022