Quenching thiab tempering ntawm crankshafts
2020-01-16
Quenching txheej txheem thiab lub hom phiaj
Lub workpiece yog rhuab mus rau lub austenitizing kub rau ib tug tej lub sij hawm ntawm lub sij hawm thiab ces txias ntawm tus nqi siab tshaj qhov tseem ceeb txias tus nqi kom tau ib tug kev kho cua sov txheej txheem ntawm ib tug martensite qauv.
Txhawm rau txhim kho lub siab hardness thiab hnav tsis kam ntawm lub workpiece
Tsawg-kub tempering txheej txheem thiab lub hom phiaj
Kev kho cua sov txheej txheem uas cov hlau quenched yog rhuab ntawm 250 ° C. thiab ces txias.
Yuav kom tswj tau qhov siab hardness thiab hnav tsis kam ntawm quenched workpiece, txo qhov seem seem thiab brittleness thaum quenching.
Yuav ua li cas paub qhov txawv ntawm quenched thiab unquenched crankshaft?
Hlau reacts chemically nrog oxygen nyob rau hauv cov huab cua ntawm high kub los tsim dub hlau trioxide. Qhov no txawv ntawm qhov peb feem ntau hu ua xeb. Qhov peb feem ntau hais txog xeb yog cov hlau ua rau cov pa oxygen, dej, thiab lwm yam khoom hauv huab cua ntawm chav tsev kub kom tsim tau (qhov tseem ceeb ntawm xeb) hlau oxide, liab.
Hlau yog rhuab hauv oxygen:
3Fe + 2O2 === Cua sov ==== Fe3O4
Hlau rusts hauv huab cua:
unquenched crankshaft
quenched crankshaft
