Lub tshuab nqus tsev high-pressure gas quenching multi-purpose rauv

Lub tshuab nqus tsev quenching ntawm high-speed steel loj cov cuab yeej thiab pwm (xws li lub tshuab nqus tsev twj tso kua mis quenching nrog roj siab ntawm 1.3-2Pa) tsis tuaj yeem tiv thaiv nag lossis daus ntawm carbides raws austenite grain ciam teb thaum lub sij hawm quenching txheej txheem vim qeeb txias ceev, uas dilutes alloying degree ntawm austenite thiab txo cov xim liab hardness thiab kev pab lub neej ntawm cov cuab yeej. Vim li no, cov neeg ua haujlwm siab ceev hlau loj thiab cov pwm siv los tsuas yog ua kom quenching kho nyob rau hauv lub qhov cub ntsev da dej. Lub tshuab nqus tsev siab siab quenching tuaj yeem kov yeej qhov tsis zoo no.
Cov ntaub ntawv C56 muab cov ntaub ntawv txias rau cov ntsev da dej rauv thiab lub tshuab nqus tsev siab (5Pa) roj hluav taws kub (VTC) rauv nrog tag nrho ntawm 100k8 high-speed steel 25, 32, thiab 5m kawg mills, quenched thiab txias los ntawm 1190 degree mus rau 650 degree , raws li qhia hauv Tables 2-18. Cov ntaub ntawv nyob rau hauv lub rooj qhia tau hais tias qhov txias npaum li cas ntawm lub tshuab nqus tsev high-pressure gas quenching rau loj txoj kab uas hla tej cuab yeej yog ceev tshaj li ntawm ntsev da dej quenching. Daim ntawv thov ntawm lub tshuab nqus tsev high-pressure gas quenching rau loj dua high-speed steel workpieces kuj tau ua tiav cov txiaj ntsig zoo. Cov ntaub ntawv kev ua tau zoo tuaj yeem pom hauv Cov Lus 2-19 thiab 2-20. Raws li cov ntaub ntawv hauv Table 2-19 thiab 2-20, high-speed steel workpieces mus txog 114mm kuj tuaj yeem raug rau lub tshuab nqus tsev siab siab quenching.
(1) Kev kub ceev steel ntsev da dej quenching
Workpiece preheated ntawm 870 degree, austenitized ntawm 1193 degree, graded quenched ntawm 627 degree, tempered ob zaug ntawm 527 degree, txhua lub sij hawm rau 3 teev
(2) Kev kub ceev steel nqus tsev vacuum high-pressure gas quenching
Preheat ntawm 843 degree rau 4 teev nyob rau hauv VTC rauv, austenitize ntawm 1193 degree rau 5 feeb, thiab qhia high-pressure nitrogen gas nrog ib tug siab ntawm 5 Pa kom txias lub workpiece kom qis dua 93 degree rau tempering. Cov tempering tsis yog tib yam li cov rau ntsev rauv quenching.
Tsis tas li ntawd, nws yog sib xws nrog ntsev da dej rauv quenching, nqus cua kub roj quenching, thiab lub tshuab nqus tsev twj tso kua mis quenching.