Self-tapping screws lub ntsiab nta
Txawm hais tias muaj ntau hom, lawv txhua tus muaj lub ntsej muag tseem ceeb hauv qab no:
(1) Nws feem ntau yog ua los ntawm carburized steel (99% ntawm tag nrho cov khoom). Nws tseem tuaj yeem ua cov hlau stainless lossis cov hlau tsis sib haum.
(2) Cov khoom yuav tsum muab tshuaj kho cua sov. Carbon steel tus kheej tapping screws yuav tsum tau carburized, thiab stainless hlau tus kheej-tapping screws yuav tsum tau cov khoom muaj zog. Txhawm rau kom ua tiav cov khoom kho tshuab thiab kev ua haujlwm ntawm tus kheej kheej taij screws kom ua tau raws li tus qauv xav tau.
(3) Cov khoom muaj qhov siab ua tau zoo thiab cov tawv zoo ntawm cov tawv tawv. Ntawd yog, "sab hauv sab hauv tsuas yog." Qhov no yog qhov tseem ceeb ntawm kev ua tiav cov kev xav tau ntawm tus kheej tapping screws. Yog hais tias qhov saum npoo tawv tawv nyob hauv qis, nws yuav tsis raug ntsia hlau rau hauv paus; yog tias tus tub ntxhais muaj qhov tsis zoo, nws tsis tuaj yeem siv yog tias nws tau tawg. Yog li no, "sab hauv lub qhov rooj sab nraud" yog qhov yuav tsum ua kom tau tus kheej-tapping screws kom ua tau raws li qhov ua tau zoo.
(4) Qhov saum npoo ntawm cov khoom xav tau kev tiv thaiv kev tiv thaiv saum npoo, feem ntau ua kev kho mob electroplating. Qee cov khoom lag luam xav tau kev kho mob phosphate (phosphating). Xws li: phab ntsa vaj huam sib luag ntawm tus kheej ntsuas phuam screws feem ntau phosphating.
(5) Ntau lawm los ntawm cov hau kev txias. Kev kub ceev lub taub hau txias tshuab thiab lub tshuab hluav taws xob ntau lub yob hlau lossis tshuab siab ceev yob lub ntiaj teb tshuab yob raug pom zoo kom paub meej cov khoom zoo. Lub taub hau ntawm tus kheej tapping ntsia hlau yog li tsim tau tsim thiab txoj xov zoo.