Kev ntsuam xyuas tensile ntawm cov khoom siv hlau yog ib txoj hauv kev tseem ceeb rau kev ntsuam xyuas lawv cov khoom siv kho tshuab thiab nws tseem ceeb heev. Los ntawm kev ntsuas cov yam ntxwv xws li lub zog tensile, lub zog tso zis, thiab elongation, nws ntsuas qhov muaj peev xwm thauj khoom thiab cov yam ntxwv yas deformation ntawm cov khoom. Nws muab lub hauv paus kev nyab xeeb rau kev tsim qauv engineering thiab ua kom muaj kev ntseeg siab ntawm cov qauv. Nws kuj ua haujlwm ua lub cuab yeej tswj xyuas zoo tseem ceeb, txheeb xyuas qhov ruaj khov ntawm cov txheej txheem tsim khoom thiab ua kom ua raws li cov qauv thoob ntiaj teb. Ntxiv mus, nws tuaj yeem kwv yees qhov kev pheej hmoo ntawm kev ua tsis tiav ntawm cov khoom siv hauv qab cov khoom hnyav thiab muab kev txhawb nqa cov ntaub ntawv tseem ceeb rau kev tsim cov khoom siv tshiab.
Cov hauv qab no yog kev sib piv ntawm cov txheej txheem kuaj tensile raucov kav hlau ductilethiabCov kav dej SML, ob qho tib si pab ua kom cov khoom zoo thiab siv tau ntev hauv ntau qhov xwm txheej tiag tiag.
1. Cov Qauv Sib Txawv
Lub thickness thiab txoj kab uas hla ntawm cov pas nrig kuaj ntawm cov qauv hlau ductile yog raws li nram no:
| Hom casting | Lub cheeb tsam nominal ntawm qhov ntsuas bar (hli) | Kev txwv tsis pub dhau ntawm txoj kab uas hla (hli) | Kev kam rau siab ntawm txoj kab uas hla (hli) |
| Cov yeeb nkab hlau ductile phab ntsa tuab (hli) e <6 6≤e＜8 8≤e＜12 12≤e | 2.5 3.5 5.0 6.0 | ±0.06 | 0.03 |
| Cov kav dej hlau tsis ductile, cov khoom siv, thiab cov khoom siv ntxiv: - Cov qauv casting sib xyaw: - Cov qauv casting sib cais: Rau cov qauv uas muaj tuab ntawm 12.5 hli, qhov tuab ntawm casting yuav tsum tsawg dua 12 hli. Rau cov qauv uas muaj tuab ntawm 25 hli, qhov tuab ntawm casting yuav tsum yog ≥ 12 hli. | 5.0 6.0 12.0 los yog 14.0 | ±0.06 ±0.06 ±0.09 | 0.03 0.03 0.04 |
Lus Cim: Tus pas ntsuas yog ua los ntawm cov qauv tshuab, sawv cev rau cov hlau nyob rau hauv nruab nrab tuab ntawm cov qauv. Nws suav nrog ib feem cylindrical. Lub cheeb tsam ntawm lub tog raj kheej tau qhia nyob rau hauv lub rooj saum toj no. Qhov ntev ntawm lub ntsuas ntawm tus pas ntsuas yog tsawg kawg yog 5 npaug ntawm nws txoj kab uas hla. Qhov kawg ntawm tus pas ntsuas yuav tsum tsim nyog rau kev teeb tsa hauv lub tshuab ntsuas. Qhov roughness ntawm qhov cylindrical ntawm tus pas ntsuas yog Rz ≤ 6.3.
Cov yeeb nkab SML yog ua los ntawm cov hlau grey cast thiab nws cov qauv yuav tsum ua raws li daim duab hauv qab no:
Lus Cim: Yuav kom tau txais cov txiaj ntsig ntawm kev xeem uas sawv cev rau cov khoom tiav li sai tau, cov qauv xeem yuav tsum tau coj los ntawm cov yeeb nkab SML lossis SML fitting thiab txiav sib luag rau lub axis ntawm cov yeeb nkab lossis fitting. Yuav tsum ntsuas thaj tsam thawj ntawm cov qauv. Qhov dav thiab tuab ntawm qhov seem yuav tsum tau ntsuas kom raug txog 0.1 hli ua ntej kuaj.
2. Qhov sib txawv ntawm cov txheej txheem xeem
Txawm hais tias ob qho kev sim tensile raug ua tiav los ntawm kev siv lub tshuab kuaj tensile thoob ntiaj teb, cov khoom siv siv sib txawv.Cov khoom siv kuaj tensile rau cov hlau ductile yog qhia hauv qab no:
Cov yeeb nkab SML thiab cov khoom siv tensile kuaj tau qhia hauv qab no:
3. Qhov sib txawv ntawm Cov Txiaj Ntsig Kev Xeem thiab Cov Khoom Siv
Cov txheej txheem smelting thiab tsim cov hlau ductile yog cov khoom ntawm ntau xyoo ntawm kev sib sau ua ke ntawm thev naus laus zis thiab kev ua haujlwm zoo. Peb lub tuam txhab tsim cov kav hlau ductile zoo, nrog rau tus nqi spheroidization ntawm 90% lossis siab dua. Kev sim tensile qhia txog lub zog tensile ntawm 460MPa thiab 490MPa, thiab elongations ntawm 10% thiab 17%. Raws li EN545 thiab ISO2531 cov qauv, lub zog tensile ntawm 420MPa lossis siab dua thiab elongation ntawm 5% txog 10% lossis siab dua yog suav tias yog qhov txais tau. Lub zog tensile thiab elongation txheem yog raws li nram no:
Cov kav dej SML thiab cov khoom siv feem ntau yog ua los ntawm cov hlau grey cast. Cov qauv graphite flake hauv cov hlau grey cast nqus cov dej co, ua rau cov suab nrov ntws tsawg kawg yog 10dB qis dua cov kav dej PVC. Lawv kuj muaj kev tiv taus kub siab zoo heev, tshaj 1,000 ° C. Cov roj hmab sealing tseem ua haujlwm txawm tias nyob rau ntawm 70 ° C txuas ntxiv lossis 120 ° C tso tawm ib ntus, nrog rau kev hloov pauv thermal tsuas yog ib feem xya ntawm cov kav dej PVC. Lawv kuj muaj lub zog tensile zoo heev, tiv taus kev cuam tshuam, thiab tiv taus kev sib txhuam, tsawg kawg yog tsib zaug ntawm cov kav dej PVC.
Raws li tus qauv EN877, cov khoom siv kho tshuab ntawm SML cov kav dej thiab cov khoom siv yog raws li nram no:
| Casting hom thiab cov khoom siv | Lub zog tensile tsawg kawg nkaus (Mpa) |
| Lub cev: Grey hlau | 200 |
| Kev sib txuas: grey cast iron | 150 |
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Lub sijhawm tshaj tawm: Cuaj hlis-22-2025
