Cold Drawing yog dab tsi?

1. Lub hom phiaj ntawm kev kos duab txias:

Kev kos duab txias yog txheej txheem ntawm kev ncab cov khoom ntawm chav tsev kub. Thaum lub sij hawm stretching txheej txheem, cov khoom dhau los ntawm kev tuag. Los ntawm qhov compression ntawm cov khoom siv los ntawm qhov tuag, tus ntoo khaub lig- ntu ntu ntawm cov khoom tuaj yeem hloov pauv raws li qhov sib txawv ntawm qhov tuag.

Kev kos duab txias ntawm cov khoom xav tau cov khoom siv tuaj yeem rub tau, yog li lub zog nqus ntawm cov duab txias yuav tsum siab tshaj qhov tawm los ntawm cov khoom siv. Nyob rau tib lub sijhawm, kev kos duab txias yuav tsum tau ua kom ntseeg tau tias cov khoom tsis tawg, yog li lub zog nqus ntawm cov duab txias yuav tsum tsawg dua lub zog tensile ntawm cov khoom.

 

2. Kev cuam tshuam ntawm kev kos duab txias ntawm cov hlau

Loj

Lub luag haujlwm tseem ceeb ntawm kev kos duab txias yog tswj qhov loj ntawm cov khoom. Thaum lub sij hawm txias txheej txheem, cov pwm yuav nyem thiab deform cov khoom. Cov neeg tsim khoom tuaj yeem tswj qhov loj ntawm cov khoom siv tom qab txias txias los ntawm kev siv pwm sib txawv. Nws yuav tsum raug sau tseg tias yog tias qhov loj me ntawm cov khoom tiav lawm txawv ntawm qhov loj ntawm cov khoom ua ntej kos duab txias, cov duab txias yuav nyuaj rau rub. Hauv qhov no, cov khoom siv yuav tsum tau dhau los ntawm ntau qhov kev kos duab txias. Nyob rau tib lub sijhawm, vim tias tus ntoo khaub lig- ntu ntu ntawm cov khoom txo qis thaum lub caij txias txias, qhov ntev ntawm cov khoom tom qab kos duab txias yuav nce ntxiv.

 

Cov duab

Lwm txoj haujlwm ntawm kev kos duab txias yog hloov cov duab ntawm tus ntoo khaub lig- ntu ntawm cov khoom siv hlau. Qhov sib txawv ntawm cov duab yog txiav txim los ntawm qhov sib txawv ntawm cov pwm. Piv txwv li, yog tias cov pwm yog square, ces tus ntoo khaub lig - ntu ntawm cov khoom tom qab kos duab txias yuav yog square. Yog hais tias ib puag ncig bar yog txias kos nyob rau hauv txoj kev no, lub square bar yuav tau txais tom qab txias dov. Nws yuav tsum raug sau tseg tias yog tias cov khoom yuav tsum tau deformed thiab kos txias, qhov ntev ntawm cov khoom ua ntej thiab tom qab cov duab txias yuav tsum zoo sib xws.

 

Nto

Qhov thib peb nyhuv ntawm kev kos duab txias ntawm lub alloy yog qhov chaw. Thaum cov khoom dhau los ntawm cov pwm, vim muaj kev sib txhuam ntawm cov pwm thiab cov khoom siv, cov impurities ntawm qhov chaw ntawm cov khoom raug tshem tawm. Qhov no yuav muab cov khoom zoo sib xws polished. Rau cov kab dub, tom qab kos duab txias, lawv dhau los ua cov kab ci ntsa iab. Txawm li cas los xij, feem ntau tom qab kos duab txias, peb tseem yuav txuas ntxiv polish lossis zom cov khoom.

Mechanical zog

 

Kev kos duab txias kuj muaj kev cuam tshuam rau cov khoom siv kho tshuab ntawm cov hlau. Thaum lub sij hawm deformation ntawm cov hlau, ib qho phenomenon hardening tshwm sim, thiab txias daim duab kuj yog ib tug txias deformation txheej txheem, uas kuj ua rau ib tug hardening tshwm sim. Qee zaum, kev kos duab txias tuaj yeem siv los tswj lub zog ntawm cov hlau. Tau kawg, qhov tshwm sim hardening tshwm sim los ntawm cov txheej txheem kos duab txias tuaj yeem raug tshem tawm los ntawm kev kho cua sov.