Xov Hom

Standard self-tapping ntsia hlau cim cim cim, nrog rau cov cim sawv cev xov thiab tus Tsov tus tw. Self-tapping screws muaj ib lossis ob lub cim uas sawv cev rau cov xov los sawv cev rau cov xov hlau lossis cov xov dav (SPACED). Yog hais tias nws muaj tus cim "B", nws txhais tau hais tias nws yog ib tug dav xov ntsia hlau. Cov uas tsis muaj "B" sawv cev rau txhua yam xov, thiab tus Tsov tus tw sawv cev rau cov cim kom paub qhov txawv ntawm tus kheej tapping screws li xov sib sau, txiav, dov los yog nws tus kheej tho. Cov xov hlau muaj tib yam 60-degree xov lub kaum sab xis thiab tib lub suab ntawm cov xov tuab thiab nyias raws li cov xov British thiab Asmeskas sib koom ua ke. Yog tias cov screws ploj los yog tsim nyog tom qab disassembly, lawv tuaj yeem hloov tau los ntawm cov qauv xov fasteners. Cov xov dav dav muaj 60 degree xov lub kaum ntse ntse tab sis nws lub suab yog dav dua, thiab vim nws qhov dav dav, nws cov xov yog steeper thiab nws cov xov txhuas loj dua li ntawm lub tshuab xov. Muaj lwm hom xov tshwj xeeb uas siv rau ntawm cov yas, uas nws lub kaum sab xis yog 48 degrees, feem ntau hu ua PT ntsia hlau. Xov tsim tus kheej tapping screws A, AB, B, BP, C thiab lwm hom tau maj mam hloov los ntawm xov dov nws tus kheej tapping screws, yog li nws tsis pom zoo kom siv cov qauv tshiab. Qhov sib txawv ntawm AB, B, BP tsuas yog nyob rau hauv cov duab ntawm tus Tsov tus tw. AB muaj ib tug threaded cone tail, B muaj ib tug blunt tail, thiab BP muaj ib tug tsis threaded cone tail. Qhov nruab nrab ntawm tus taw tes tus Tsov tus tw nkag mus rau hauv lub pre-drilled qhov thiab pib tsim cov xov. Xov txiav self-tapping screws muaj BF, BP, D, F, G thiab T daim ntawv. BF thiab BP yog cov xov dav, thiab cov seem yog cov xov hlau. Qhov sib txawv ntawm cov cim qhia yog txiav tus Tsov tus tw. Txhua tus Tsov tus tw muaj cov duab uas tuaj yeem sau cov seem hauv qab txiav. Yog hais tias tus kheej-tapping ntsia hlau yog ntsia rau hauv qhov muag tsis pom qhov (qhov tsis yog qhov nkag), nws cov tawg yuav nyob twj ywm thiab muab kaw rau hauv qab ntawm lub qhov. Tab sis yog hais tias lub qhov yog tapping, cov seem yuav poob rau lwm sab ntawm lub workpiece. Yog li ntawd, nws yog ib qho tsim nyog yuav tau xav txog qhov no thaum xaiv hom ntawm tus kheej tapping ntsia hlau. Cov khib nyiab tuaj yeem ua rau muaj kuab paug, poob rau hauv qhov chaw khiav lossis ua rau cov khoom siv hluav taws xob tsis zoo. Txhua threaded dov self-tapping screws yog tshuab xov nrog tib yam ntxhib xov raws li British thiab American unified threads, thov xa mus rau SAE J81 cov kev cai. Xa mus rau SAE J1237 thiab DIN7500 rau metric threads. Laum tail self-tapping screws muaj ob hom kev txiav dav xov BSD thiab txhua yam xov CSD. Kuj tseem muaj cov xov tshwj xeeb, suav nrog cov xov siab thiab qis dua, thiab ntau yam tapping laum tails kuj tsim nyog. Vim qhov xwm txheej ntawm tapping tail thiab xov, tapping ntsia hlau tsis haum rau kev ua haujlwm qhov muag tsis pom. Thaum sib sau ua tus kheej-drilling ntsia hlau, laum tus Tsov tus tw yuav tsum tau nkag mus rau hauv lub workpiece ua ntej txiav los yog ua cov xov, yog li feem ntau yuav muaj qee cov chips. lo lus nug no. Thov xa mus rau SAE J78 thiab DIN7504 (wide thread) rau BSD thiab CSD laum-tail screws.