Bolt Classification

Raws li txoj kev sib txuas quab yuam, bolts tuaj yeem muab faib ua cov bolts zoo tib yam thiab bolts rau siv nrog cov qhov remed. Raws li lub taub hau zoo, muaj hexagonal taub hau, puag ncig lub taub hau, square taub hau, countersunk taub hau, thiab lwm yam. Hexagonal taub hau yog feem ntau siv. Countersunk taub hau feem ntau yog siv qhov twg yuav tsum muaj kev sib txuas.

U-bolts, tseem hu ua eeb bolts, tsis yog -tus qauv. Lawv yog U- zoo li tus thiab threaded ntawm ob qhov kawg kom siv nrog txiv ntseej. Lawv feem ntau yog siv los kho cov khoom siv tubular xws li cov kav dej lossis cov ntaub ntawv xws li nplooj hlav hauv tsheb. Vim tias txoj kev uas lawv kho cov khoom zoo ib yam li tus neeg caij nees, lawv hu ua eeb bolts. Raws li xov ntev, lawv tau muab faib ua tag nrho threaded thiab ib nrab threaded hom.

Raws li xov profile, lawv tau muab faib ua cov xov coarse thiab zoo xov hom. Coarse xov tsis qhia nyob rau hauv lub bolt markings. Bolts tau muab faib ua yim qib raws li lawv qhov kev ua tau zoo: 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, thiab 12.9. Bolts ntawm qib 8.8 thiab siab dua (nrog rau 8.8) yog ua los ntawm qis- carbon alloy steel lossis nruab nrab- carbon steel thiab tau txais kev kho cua sov (quenching thiab tempering), feem ntau hu ua siab - lub zog bolts. Bolts ntawm qib 8.8 thiab qis dua (tsis suav nrog 8.8) feem ntau hu ua bolts zoo tib yam.

Ordinary bolts tau muab faib ua peb qib: A, B, thiab C, raws li lawv qhov raug precision. Qib A thiab B yog qhov tseeb bolts, thaum qib C yog cov ntsia liaj qhov rooj ntxhib. Rau kev sib txuas bolts siv hauv cov qauv steel, tshwj tsis yog tias tau teev tseg, lawv feem ntau yog qib C bolts zoo tib yam. Cov txheej txheem txheej txheem sib txawv ntawm cov qib, feem ntau sib xws rau cov hauv qab no: ① Qib A thiab B bolts muaj shanks machined ntawm lub tshuab dhos, ua rau lub ntsej muag du thiab meej qhov ntev. Lawv cov khoom ua tau zoo yog qib 8.8. Kev tsim khoom thiab kev teeb tsa yog qhov nyuaj, thiab tus nqi siab, yog li lawv tsis tshua siv. ② Qib C bolts yog tsim los ntawm cov hlau tsis muaj txheej txheem, uas ua rau qhov loj me me. Lawv cov ntaub ntawv ua tau zoo yog 4.6 lossis 4.8. Shear kev sib txuas nthuav tawm loj deformation tab sis yooj yim rau nruab thiab muaj cov nqi tsim khoom tsawg. Lawv feem ntau siv rau kev sib txuas tensile lossis kho ib ntus thaum lub sijhawm teeb tsa.