Cov ntsuas tsis yog tus qauv siv niaj hnub siv, thiab lawv tau siv ntau lub teb xws li saib tsom iav, cov tsheb loj loj, thiab chaw txawb chaw. Screws yog qhov khoom tsim rau tib neeg cov khoom. Raws li daim ntawv sau npe, nws yog qhov tseem ceeb ntawm noob neej. Yog li cas koj siv lub screws?
Lub luag haujlwm ntawm tus qauv tsis yog tus qauv:
Kev ua haujlwm tseem ceeb ntawm tus qauv tsis yog tus qauv yog txuas rau cov cuab yeej uas nrawm nrawm ntawm qhov chaw, uas tseem hu ua shaped screws. Muaj ntau ntau lub cav uas tsis tas yuav tsum tau ceev thaum txuas. Ntawm chav kawm, qhov tsis yooj yim uas tsis yog tus qauv screws uas tsis siv neeg rau yog qhov tseem ceeb rau qhov txuas txuas.
Tsis yog cov qauv ntsuas
Non-txheem ntsia hlau khoom:
Feem ntau, tus qauv tsis yog tus qauv ntawm cov hlau, cov pa roj carbon tsawg, cov pa qis, thiab lwm cov ntaub ntawv. Cov ntsiab lus ntawm carbon cov dej muaj qhov txawv los ntawm qis carbon, cov pa nruab nrab, cov pa roj carbon hlau thiab cov hlau hlau. Cov pa roj carbon tsawg C% ≤ 0.25% Domestically npe hu ua A3 steel. Yeej paub tias txawv teb chaws li 1008,1015,1018,1022 thiab hais txog. Feem ntau yog siv rau 4.8 bolts thiab 4 ceev, screws me me thiab lwm yam khoom uas tsis muaj qhov yuav tsum ua. (Faj seeb: Drilling cov nails yog ua los ntawm 1022 cov ntaub ntawv.) Medium carbon steel 0.25%