Brazing ntawm cov cuab yeej steel thiab cemented carbide

1. Cov khoom siv brazing

(1) brazing cuab yeej hlau thiab cemented carbides feem ntau yog siv cov tooj liab ntshiab, tooj liab zinc thiab nyiaj tooj liab crazing cutre.Ntsiav tooj ntshiab tau zoo wettability rau txhua hom cemented carbides, tab sis cov txiaj ntsig zoo tshaj plaws tuaj yeem tau los ntawm brazing hauv kev txo cov cua ntawm hydrogen.Nyob rau tib lub sijhawm, vim lub siab brazing kub, kev ntxhov siab hauv kev sib koom ua ke yog loj, uas ua rau nce ntxiv ntawm kev nce zuj zus.Lub zog shear ntawm kev sib koom tes nrog tus tooj ntshiab yog li 150MPA, thiab nws tsis haum rau kev ua haujlwm kub.

Tooj liab Zinc Folding hlau yog feem ntau siv cov muab tub lim hlau rau cov hlau brazing thiab cemented carbides.Txhawm rau txhim kho lub wettability ntawm cov cam thiab lub zog ntawm kev sib koom ua ke, MN, NI, FE thiab lwm cov almoy ntsiab yog feem ntau ntxiv rau kev sib tsoo.Piv txwv li, W (MN) 4% yog ntxiv rau B-Cu58znmn txhawm rau ua rau lub zog shear ntawm kev tso cai carbide brazed koom nrog 300 ~ 320mpa ntawm chav sov;Nws tseem tuaj yeem tswj tau 220 ~ 240mpa ntawm 320 ℃.Ntxiv ib qho me me ntawm co raws ntawm b-cu58znmn tuaj yeem ua rau muaj lub zog ci thiab qaug zog kev pabcuam lub neej thiab cov cuab yeej siv pob zeb cov cuab yeej siv hluav taws xob.

Qhov qis melting taw tes ntawm cov nyiaj tooj liab brazing muab cov hlau ua kom muaj txiaj ntsig zoo los txo cov kev sib tsoo ntawm kev ua kom carbide thaum brazing.Txhawm rau txhim kho cov wettability ntawm cov cam thiab txhim kho lub zog thiab ua haujlwm kub ntawm kev sib koom tes, mn, ni thiab lwm cov alloy cov ntsiab lus feem ntau ntxiv rau cov cam.Piv txwv li, B-Ag50cuznci solder tau zoo heev wettability rau cemented carbide, thiab kev sib koom tes brazed muaj cov khoom zoo.

Ntxiv nrog rau cov saum toj no peb hom Ciaj Ua Chaw Ua Tub Tuag Siv Hlau, MN Raws li B-Mn50crroed Cartals thiab B-Mn50crroid ua haujlwm tshaj 500 ℃ thiab xav tau kev sib koom tes siab.Rau qhov brazing ntawm high-ceev steel, tus cart tshwj xeeb muab tub lim hlau nrog lub ntsuas kub brazing nrog qhov ntsuas kub quenching.Tus tub lim hlau no tau muab faib ua ob pawg: ib qho yog ferromanganese hom muab tub lim hlau, uas yog tsuas yog tsim ntawm Ferromanganese thiab Borax.Lub zog shear ntawm cov sib koom tes brazed feem ntau yog feem ntau txog 100MPA, tab sis kev sib koom tes yog nquag mus tawg;Lwm hom tshwj xeeb tooj liab tagnrho muaj NI, FE, MN thiab SI tsis yooj yim los tsim cov kab nrib pleb, thiab nws lub zog shear tuaj yeem nce mus rau 300MPA.

(2) Xaiv ntawm Brazing Flux thiab kev thaiv cov roj brazing flux yuav tsum phim nrog cov hlau hauv paus thiab cov tub lim hlau kom zoo nkauj.Thaum brazing cuab yeej hlau thiab cemented carbide, tus brazing flux siv feem ntau yog borax thiab boric acid, thiab tshuaj fluorides (kf, khoom noj haus, thiab lwm yam) ntxiv.FB301, FB302 thiab FB105 fluxes tau siv rau tooj liab zinc cam khwb, thiab fb101 ~ fb104 fluxes tau siv rau cov nyiaj tooj tooj liab tooj.Borax Flux feem ntau yog siv thaum canzing tshwj xeeb muab tub lim hlau yog siv los ci ceev hlau.

Txhawm rau tiv thaiv oxidation ntawm cov cuab yeej kub thaum muaj cua sov brazing thiab kom tsis txhob tu tom qab brazing tom qab brazing, cov pa thaiv cov paib tuaj yeem siv tau.Cov roj tiv thaiv tuaj yeem yog cov roj hauv plab lossis txo cov roj av, thiab cov roj av tsis muaj zog dua-℃ ℃.

2. Brazing tshuab

Cov cuab yeej ua ntej tsim ua ntej Brazing, thiab cov tshuab yuav tsum tsis txhob ua kom yooj yim los pab txhawb kev ntub dej thiab nthuav tawm cov ntaub ntawv thiab hla cov ntaub ntawv flux.Lub saum npoo ntawm kev tso cai carbide yuav tsum tau xuab zeb blasted ua ntej brazing ua ntej brazing, lossis polished nrog silicon carbide lossis yog li yuav tsum tau wetted los ntawm brazing muab tub lim hlau thaum brazing.Cemented carbide uas muaj titanium carbide yog qhov nyuaj rau ntub.Tooj liab oxide lossis npib oxide tshuaj txhuam yog thov rau nws cov npoo hauv txoj kev tshiab los ua kom zoo nkauj los yog nickel hloov mus rau saum npoo, yog li ua kom cov wettability ntawm cov khoom siv tsis muaj zog.

Lub brazing ntawm carbon Tool hlau yuav tsum nyiam dua yuav tau ua ntej lossis tib lub sijhawm uas yog kev txiav txim siab.Yog hais tias brazing yog nqa tawm ua ntej cov txheej txheem quenching, tus ntsuas kub ntawm cov muab tub lim dej yuav tsum muaj zog txaus thaum ua kom sov kom tsis muaj dab tsi.Thaum brazing thiab quenching yog sib xyaw ua ke, tus muab tub lim hlau nrog solidus kub kom ze rau quenching kub yuav tsum raug xaiv.

Alloy cuab yeej steel muaj ntau yam ntawm cov khoom.Tsim nyog branzing muab tub lim hlau, txheej txheem kho cua sov thiab kev kho cua sov yuav tsum txiav txim siab raws li hom steel tshwj xeeb, yog li kom tau txais kev ua haujlwm zoo.

Lub quenching kub ntawm high-ceev steel yog feem ntau siab dua li melt kub ntawm cov nyiaj tooj liab thiab nws yog ib qho tsim nyog los quinch ua ntej brazing thiab brazing thaum lossis tom qab kev kub siab dua.Yog tias yuav tsum tau quenching tom qab brazing, tsuas yog cov saum toj no-hais tshwj xeeb canzing muab tub rog hlau tuaj yeem siv rau brazing.Thaum brazing high-ceev steel tej cuab yeej, nws yog qhov tsim nyog los siv coke cub tawg.Thaum cov neeg muab tub lim rau cov hlau ua kom tiav, tshem tawm cov khoom siv txiav

Thaum brazing cov cemented carbide hniav nrog cov khoom siv hlau ua kom muaj kev ntxhov siab, tsis txhob muaj kev kub ntxhov, tiv thaiv cov kab nrib pleb Ntev lub neej kev pab cuam ntawm cov cemented carbide cov cuab yeej sib dhos.

Tom qab fiber vuam, cov flux residue nyob rau hauv kev siv dej yuav tsum tau ntxuav nrog dej kub lossis tshem tawm cov tshuaj uas tsim nyog rau kom tshem tawm cov kab yeeb yaj kiab uas tsim nyog rau ntawm cov pas nrig puag.Txawm li cas los xij, ceev faj kom tsis txhob siv cov roj nitric acid los tiv thaiv corrosion ntawm brazing sib koom ua ke hlau.