Lub Hardenability ntawm Clamping Phaj Cov Khoom thiab Cov Khoom Siv ntawm Clamping Force rau Loj -Section Rails
Vim li cas ho clamping loj -section rails yuam kom hardenability siab dua ntawm cov phaj siab?
Loj -section rails (piv txwv li, Ntau dua lossis sib npaug li 75kg / m) muaj lub taub hau dav dav tshaj 80mm, yuav tsum tau nce ntxiv hauv cov phaj siab load-cov kabmob hla-section. Tsis txaus hardenability ua rau tsuas yog saum npoo tsim siab -strength martensite thaum quenching, thaum lub hauv paus tseem mos ferrite-pearlite. Thaum lub sij hawm bolt nruj, tsis sib npaug elastic deformation tshwm sim ntawm qhov chaw thiab cov tub ntxhais, tsom clamping quab yuam ntawm lub phaj npoo thiab tawm hauv lub zog tsis txaus ntawm lub tsheb ciav hlau qhov chaw. Qhov kev quab yuam tsis sib xws no tsis txwv qhov loj - ntu kev tsheb ciav hlau hloov chaw, yooj yim ua rau kab mob.
Yuav ua li cas txheeb xyuas qhov tsis sib xws clamping quab yuam faib ntawm daim hlau nrog tsis txaus hardenability?
Covclamping quab yuam faib coefficient(qhov sib piv ntawm qhov siab tshaj plaws rau qhov tsawg kawg nkaus clamping quab yuam tshaj qhov ntev ntev) yog siv. Rau cov phaj uas muaj kev ua tau zoo txaus, cov coefficient tsawg dua los yog sib npaug rau 1.2 (kev faib khoom sib txawv). Rau qhov tsis txaus hardenability, nws tuaj yeem tshaj 1.5. Piv txwv li, 75kg / m rail phaj nrog tsis zoo hardenability tej zaum yuav muaj ib tug ntug clamping quab yuam ntawm 12kN tab sis tsuas yog 7kN ntawm qhov chaw-deb raws li qhov yuav tsum tau ua thiab tsis zoo rau clamping.
Yam tshuaj twg feem ntau txiav txim siab hardenability ntawm cov khoom siv phaj siab?
Hardenability nyob ntawmalloying cov ntsiab lus; carbon yog qhov tseem ceeb, thiab alloys yog qhov tseem ceeb. Cov khoom siv feem ntau yog 45 # steel lossis 40Cr steel -40Cr muaj qhov ua tau zoo dua qub vim yog chromium ntxiv. Alloys xws li chromium, manganese, molybdenum, thiab vanadium txo qis qhov tseem ceeb ntawm qhov txias txias, ua kom muaj martensite hauv cov tub ntxhais thaum quenching. Rau loj -section rails, nruab nrab-carbon alloy steels (xws li, 42CrMo) nrog cov ntsiab lus alloy siab dua yog siv los txhim kho hardenability.
Tshaj li kev xaiv cov khoom, "martempering" hauv kev kho cua sov li cas txhim kho phaj hardenability thiab clamping uniformity?
Martempering yuav tsum ua kom sov lub phaj rau qhov kub austenitizing, txias nws hauv molten ntsev los yog cov roj kub me ntsis saum Ms taw tes kom sib npaug ntawm cov tub ntxhais thiab qhov kub thiab txias, ces cua- cua txias rau chav sov. Cov txheej txheem notxo tus nqi cua txias gradients, zam kev sib txawv ntawm cov txheej txheem los ntawm kev ua kom txias sai thiab cov tub ntxhais txias txias. Martempering ua rau cov qauv zoo li tempered sorbite thoob plaws hauv lub phaj, kom ntseeg tau tias cov qauv elastic zoo ib yam thiab tsis sib xws hauv kev thauj khoom- lav txawm tias clamping quab yuam rau loj - ntu rails.
Yuav ua li cas txiav txim siab ua ntej phaj hardenability tsim nyog ntawm ntawm -qhov chaw hardness kuaj?
Covcross-sectional hardness test is used: sample plates are cut along the load-bearing cross-section, polished, and tested for hardness at the surface, 1/2 thickness, and core using a Rockwell durometer. For qualified plates, hardness values at the three positions are nearly identical (deviation ≤HRC 3). A core hardness ≥HRC 5 lower than the surface indicates insufficient hardenability and structural differences. Additionally, a clamping force test with a distribution coefficient >1.2 indirectly lees paub qhov tsis zoo hardenability- cov phaj zoo li no raug txwv nruj rau qhov loj -section rail installation.