Feem ntau yog hais txog taw tes, ntxig cov hniav, kev ntxhib los mos nyuaj ntoo screws, tab sis kuj yog rau aluminium alloys, yas. Ib qho tshwj xeeb me me ntsia hlau rau threading ib qhov hlau yog hu ua ib tug kais.
Tapping self-tapping
Stainless tus hlau ntsia hlau deg kho: Feem ntau ntawm tus kheej tapping screws yog them nrog galvanized los yog zinc phosphate txheej. Cadmium plating tsis tshua siv vim nws cov nqi siab thiab toxicity. Yog tias qhov tsos yog qhov tseem ceeb, nickel plating yuav xaiv tau. Chromium. Tsos qhov tshwm sim ntawm ob nqe lus nug: Ua ntej, qhov pom ntawm kev kho yuav tsis tsuas nce lub nplai (xws li qhov txo qhov ntawm qhov, thiab lwm yam) thiab qhov txawv ntawm kev kho kev txawv txav yuav cuam tshuam rau lub zog, zawm zog, qhov txuas ntawm lub zog , nyob rau hauv ua qhov kev sim yuav tsum tau ua raws li txoj cai nrog galvanization, cadmium plating los yog phosphate kho ua txoj cai qub. Thaum ntsuas qhov tho qhov, qhov hlau tsis siv hlau yuav tsum zoo ib yam li cov khoom siv sab nraud pov tseg. Qhov thib ob yog, qhov kev kub ntxhov Me me nplai qhov kev sib tsoo feem ntau ua rau kev tsis ua hauj lwm vim tias hydrogen embrittlement. Tapping self-tapping yuav tsum tau carburised thiaj li yuav tua lub phaj hlau. Cov kev kub ntxhov thiab cov ntaub ntawv siab yuav tshwm sim tom qab teeb meem thiab pov tseg. Hauv qhov no, hydrogen hnyuv yuav tshwm sim thaum electroplating lossis pickling. Cov tswv yim npaj hauv cov lus qhia kom tshem tawm cov kev hloov hydrogen yog: a). Kev pub rau hauv 1 xuab moos tom qab plating lossis pickling. b). Kub 375 ~ 425 oF (190 ~ 220 oC). Tsawg kawg 4 xuab moos.
Hydrogen embrittlement test: Qhov kev sim tshuaj hydrogen hnyav yog qhov kev sim seb qhov kev sib tw ntawm tus kheej yog qhov seem ntawm hydrogen nyob hauv kev sib tsoo thiab nws yuav ua rau nws tus kheej khij qaum, (feem ntau yog txhav tawg tsis yog lub sijhawm, thiab yuav tsum muab Qhov kev nyuab siab yuav muab rau.) Cov caws paug electroplated los yog coated yuav tsum tau muab pov rau hauv cov hlau phaj thiab hlau ua Pinghua Division raws li tau teev tseg hauv Daim Ntawv Tshooj 3, thiab cov taub hau ntawm lub taub hau taub hau tob hau yuav tsum yog siv tus qauv ntawm Pinghua. Ntaus (Oval) ciav hlau siv lub nplaum chamfered steel thooj. Lub plawv ntawm lub tais hauv plawv los yog lub qhov ntu uas nyob ntawm lub taub hau ntawm lub taub hau yuav tsum piv rau qhov siab tshaj plaws ntawm qhov muag tsis pom qhov ntev ntawm lub hau ntswj. Lub shank yuav tau txais kev txhawb zog nrog cov kab txias dua los ntawm cov pob txias dua los yog lub tshuab ntxhua khaub ncaws kom paub tseeb tias cov hniav ua tiav tag nrho thiab muab khaws cia rau hauv cov phaj xeem. Cov hlau tsis xeb yuav tsum muab xauv mus rau 80% ntawm qhov siab tshaj plaws txoj hlua torque Lub siab tawg yog txiav txim los ntawm xauv lub 5 screws rau breaking point thiab txuas ntxiv kom muaj lub khawm rau 24 xuab moos. Tom qab ntawd, cov ntsia hlau yog loosened thiab ces tig mus rau tus thawj locking torque. Cov ntsia hlau yuav tsum tsis muaj teeb meem loj.