1. Saib cov duab
Thaum muas cov yeeb nkab dej, xyuas seb cov yeeb nkab dej yog deformed los yog twisted, qhov saum npoo ntawm cov kav dej tsis tu ncua yog nyob rau hauv lub tiaj tus, thiab cov xim yog sib xws. Sab nrauv phab ntsa ntawm lub raj muaj cov cim lag luam meej, cov lus qhia tshwj xeeb thiab cov hnub tsim khoom. Tshawb xyuas seb koj puas muaj daim ntawv tso cai noj qab haus huv. Yog tias tsis yog, hom yeeb nkab dej no tsis haum rau siv hauv tsev.
2. tsw
Cov kav dej feem ntau yog ua los ntawm cov yas thiab yog tsim los ntawm cov txheej txheem extrusion. Qee cov tuam txhab lag luam uas tsis paub cai tau txais txiaj ntsig loj los ntawm kev siv cov tshuaj lom neeg los ua cov kav dej. Cov tshuaj lom hauv cov kav dej yuav nkag mus rau tib neeg lub cev los ntawm cov dej, uas yuav cuam tshuam rau kev nyab xeeb ntawm dej. Thaum peb yuav, peb tuaj yeem hnov qhov tsw thiab sim nws. Yog tias cov kav dej tsis tsim nyog thiab tsis zoo, nws yuav ua rau muaj ntxhiab tsw ntxhiab.
3. Khoov cov kav dej
Sim khoov cov kav dej ntawm tes. Yog tias cov kav dej tuaj yeem khoov tau yooj yim yam tsis muaj kev tawg, nws tuaj yeem khoov rau hauv lub voj voog, uas ua pov thawj tias cov yeeb nkab dej yog qhov zoo. Yog tias cov yeeb nkab dej yas tawg thiab ua nkig thaum khoov, nws ua pov thawj tias qhov zoo ntawm cov yeeb nkab dej yog qhov tsawg. Nws raug nquahu kom muab ib qho me me ntawm cov yeeb nkab dej yas rau hauv cov dej kub kub los xyuas qhov degree ntawm hardening. Yog hais tias cov kav dej ua kom mos ntawm qhov kub ntawm 60 degrees, nws ua pov thawj tias cov kav dej tsis zoo.