Nkag siab Bolt Performance Qib:
Phau ntawv ceev
Thaum xaiv bolts rau txhua daim ntawv thov, qib kev ua tau zoo yog koj thawj qhov laj thawj rau lawv lub zog thiab kev ntseeg siab. Tab sis cov lej no txhais tau li cas - thiab lawv ua tiav li cas?
Common Material-Process Pairings
| Qib | Yam khoom siv | Txheej txheem tseem ceeb |
|---|---|---|
| 3.6–4.8 | Q235, 1008, ML08 | Lub taub hau txias, tsis muaj cua sov kho |
| 5.6–6.8 | 1015, ML25, Q275 | Txias taub hau; xaiv tau kev ntxhov siab-relief temper |
| 8.8 | 35#, 10B21, 40Cr | Quench + nruab nrab -siab kub (22–32 HRC) |
| 9.8–10.9 | 20 MnTiB, SCM435 | Precision quench + kub siab, tiv thaiv -hydrogen |
| 12.9 | 42CrMoA, SCM440 | Advanced quench + low -temp stress relief + NDT |
01
Decoding Qib
Kawm qib6.8ua piv txwv. Thawj tus lej (6) qhia tias lub zog tensile nominal - muab ntau los ntawm 100 kom tau 600 MPa. Tus lej thib ob (8) yog qhov tawm los - rau - tensile ratio lub sij hawm 10, yog li 0.8. Muab cov ob: 600 × 0.8=480 MPa nominal yield zog. Yooj yim lej, tab sis nws qhia koj raws nraim li cas lub fastener yuav lis.
02
Khoom Ib leeg tsis txaus
Kev ua tiav qib muab tsis yog tsuas yog xaiv cov hlau zoo xwb- nws yog hais txog txoj caitxheej txheem. Cov qib qis (piv txwv li, 4.6, 4.8) feem ntau tuaj yeem txias - tsim ncaj qha yam tsis muaj kev tshaj tawm - kho. Tab sis thaum koj txav mus rau qhov ntsuas, kev kho cua sov yuav tsis yog- sib tham. Rau 8.8-qib bolts, txawm tias cov ntaub ntawv zoo yuav poob qis yam tsis muaj kev quenching thiab tempering-risk tsis txaus lub zog los yog nkig tsis ua hauj lwm.
03
Txheej txheem ua qhov txawv
Xav txog 35 # steel. Nrog txiav los yog kub forging, nws feem ntau ncav cuag li 5.8. Lub taub hau txias txav nws mus rau 6.8. Tab sis ntxiv quenching thiab tempering, thiab tib cov khoom dhia mus rau 8.8. Cov lus: qib yog qhov kev tshwm sim, tsis yog cov khoom vaj khoom tsev.
04
Kab hauv qab
Kev ua tau zoo tsis raug ntaus rau hauv cov hlau- nws tau txais los ntawm kev sib xyaw ua ke ntawm cov khoom siv thiab thermal-mechanical processing. Hla ib qho, thiab koj yuav tsis ntaus qib. Ib txwm siv tau nrog cov txheej txheem tiag tiag, thiab ua raws li cov qauv tsim nyog rau koj txoj kev lag luam.
