Cov khoom Hardness ntawm Ballast Phaj thiab nws txoj kev sib raug zoo nrog Sleeper Collapse Risk Tiv Thaiv Mechanism
Vim li cas qhov nyuaj ntawm cov khoom siv phaj siab tshaj HRC40 yuav ua rau muaj kev pheej hmoo ntawm pob zeb pob zeb crushing?
Lub zog compressive ntawm qhob pw tsaug zog feem ntau yog C60-C80, sib xws rau qhov kev tso cai compressive ntawm 30-40MPa. Thaum lub hardness ntawm cov ntaub ntawv phaj siab tshaj HRC40, lub hardness ntawm lub saum npoo yog siab, qhov chaw sib cuag nrog cov pw tsaug zog yog me me, thiab compressive kev nyuaj siab nyob rau hauv ib chav tsev yuav nce los ntawm 25% -30%, tshaj qhov tso cai compressive kev nyuaj siab ntawm cov pw tsaug zog. Nyob rau hauv qhov kev txiav txim siab ntawm kev ntxhov siab, tus neeg pw tsaug zog yuav tsim cov crushing hauv zos, nrog cov kab nrib pleb thiab spalling. Nyob rau hauv lub sij hawm ntev alternating loads, cov kab nrib pleb yuav propagate sai, ua rau pw tsaug zog puas thiab cuam tshuam rau tag nrho cov khiav stability. Tsis tas li ntawd, cov phaj siab uas muaj qhov hnyav hnyav heev yog ib qho yooj yim kom muaj kev sib cuag nrog cov neeg pw tsaug zog, ua rau cov neeg tsaug zog hnyav dua thiab ua rau muaj kev pheej hmoo ntawm crushing.
Vim li cas cov neeg pw tsaug zog zoo tib yam - cov kab nrawm xaiv cov phaj siab nrog HRC35-38 es tsis yog cov uas muaj HRC40 lossis siab dua?
Lub zog compressive ntawm qhob pw tsaug zog zoo tib yam - cov kab ceev yog C60, thiab qhov tso cai compressive kev ntxhov siab yog 30MPa. Cov phaj siab nrog HRC35-38 muaj qhov nruab nrab ntawm qhov tawv tawv, qhov chaw sib cuag loj nrog cov neeg pw tsaug zog, thiab qhov kev ntxhov siab ntawm ib chav tsev yog tswj tsis pub dhau 25MPa, qis dua tus nqi tso cai. Cov phaj siab nrog qhov hardness no muaj kev hnav zoo, tsis yooj yim rau deform, thiab tuaj yeem tiv thaiv tus neeg tsaug zog los ntawm crushing. Cov phaj siab nrog HRC40 lossis siab dua muaj qhov nyuaj siab heev, thiab chav tsev compressive kev ntxhov siab tshaj tus qauv, uas yooj yim ua rau pw tsaug zog crushing, tsis haum rau cov kab nrawm nrawm. Yog li ntawd, zoo tib yam - cov kab ceev xaiv nruab nrab-hardness siab daim hlau, ntsuas clamping quab yuam thiab pw tsaug zog tiv thaiv xav tau.
Txoj kev pheej hmoo ntawm kev pw tsaug zog crushing yog siab hauv hnyav -cov kab. Yuav ua li cas tiv thaiv nws los ntawm kev xaiv cov khoom siv siab phaj?
Hnyav- cov kab tsheb thauj khoom muaj lub qag loj thauj khoom, thiab lub zog pw tsaug zog tuaj yeem ncav cuag ntau dua 50MPa. Nws yog tsim nyog los xaiv quenched thiab tempered alloy steel siab daim hlau nrog HRC38-42. Lub hardness ntawm cov khoom no yog nruab nrab. Tom qab kev kho mob carburizing, hnav tsis kam yog txhim kho los ntawm 30%, thiab tib lub sijhawm, kev sib cuag nrog cov neeg pw tsaug zog tuaj yeem txo qis. Tsis tas li ntawd, qhov chaw sib cuag ntawm lub phaj siab thiab cov neeg pw tsaug zog tuaj yeem nce ntxiv los tswj cov kev ntxhov siab hauv ib cheeb tsam hauv 35MPa, qis dua qhov tso cai compressive kev ntxhov siab ntawm tus neeg pw tsaug zog. Nyob rau tib lub sijhawm, cov ntaub ntawv siab tawv siab siab yog xaiv kom tsis txhob muaj cov phaj siab deformation los ntawm kev cuam tshuam ntawm kev thauj khoom, ntxiv kom txo tau txoj kev pheej hmoo ntawm kev pw tsaug zog crushing.
Yuav ua li cas cuam tshuam qhov tsawg hardness ntawm cov khoom siv phaj siab muaj nyob rau tag nrho cov kev ua tau zoo ntawm txoj kev clamping system?
Cov phaj siab nrog cov khoom siv tsis tshua muaj zog muaj peev xwm tiv taus cov yas deformation, thiab nws yooj yim rau bending deformation nyob rau hauv qhov kev txiav txim ntawm lub tsheb ciav hlau load. Lub phaj siab deformed tsis tuaj yeem nyob ze rau ntawm lub hauv paus kev tsheb nqaj hlau, thiab lub zog clamping txo qis los ntawm 20% -30%, ua rau kev hloov pauv ntawm txoj kev tsheb nqaj hlau thiab nce kev ntsuas qhov sib txawv. Nyob rau tib lub sijhawm, lub phaj siab deformed yuav tsim qhov khoob nrog cov neeg pw tsaug zog, tsis txuas ntxiv kev ntxhov siab, ua rau muaj kev ntxhov siab hauv zos rau cov neeg pw tsaug zog thiab ua rau muaj kev pheej hmoo ntawm crushing. Tsis tas li ntawd, qhov deformation ntawm lub phaj siab yuav ua rau muaj kev ntxhov siab tsis sib xws ntawm cov elastic clips, ua rau kom muaj zog elasticity thiab ua rau lub neej ua haujlwm luv. Yog li ntawd, qhov nyuaj ntawm cov khoom siv phaj siab yuav tsum ua tau raws li cov qauv tsim kom tsis txhob muaj kev ua haujlwm tsis zoo vim tsis txaus hardness.
Yuav ua li cas los ntsuas qhov nyuaj ntawm cov khoom siv phaj siab ntawm -qhov chaw kom ntseeg tau tias nws phim lub zog compressive ntawm tus neeg pw tsaug zog?
Lub Rockwell hardness tester tuaj yeem siv los ntsuas qhov nyuaj ntawm lub phaj siab ntawm -site. Rau cov kab nrawm nrawm, lub siab phaj hardness yuav tsum tau tswj nyob rau hauv HRC35-38, thiab rau cov kab hnyav, nws yuav tsum yog HRC38-42. Nyob rau tib lub sijhawm, nws yuav tsum tau ua ke nrog kev sim pw tsaug zog compressive zog. Yog tias tus neeg pw tsaug zog yog C60, qhov tso cai compressive kev ntxhov siab yog 30MPa, thiab lub siab phaj hardness yuav tsum tsis pub tshaj HRC38; Yog tias tus neeg pw tsaug zog yog C80, qhov tso cai compressive kev nyuaj siab yog 40MPa, thiab lub siab phaj hardness tuaj yeem nce mus rau HRC42. Tsis tas li ntawd, kev ntsuam xyuas kev sib tsoo tuaj yeem ua tau, siv qhov ntsuas ntsuas rau lub phaj siab thiab saib seb tus neeg tsaug zog crushes, kom ntseeg tau tias qhov sib txuam hardness. Tsuas yog tom qab dhau qhov kev xeem tuaj yeem muab tso rau hauv kev siv.