Cov qauv tsim ntawm kev sib tsoo pob zeb

Ib qho ntawm cov teeb meem tseem ceeb ntawm kev sib tsoo pob zeb hauv tsev tam sim no yog qhov nyiam kub hnyiab hlau [1]. Thaum lub sij hawm txoj kev tsheb ciav hlau sib tsoo, kev sib tsoo cov nyhuv ntawm abrasives (sliding, plowing, txiav) thiab kev sib txhuam ntawm cov binder thiab rail interface yog lub ntsiab ntawm kev sib tsoo kub [3]. Nyob rau hauv cov nyhuv coupling ntawm tshav kub (sib tsoo tshav kub) thiab quab yuam (mechanical quab yuam), pearlite nyob rau hauv cov khoom siv rail undergoes austenite transformation thiab tom qab ntawv cov ntaub ntawv martensite thiab ferrite thaum txias, ua rau ib tug siab hardness thiab brittle dawb txheej qauv. Cov kab nrib pleb ib nrab yuav nthuav tawm ntawm tus ciam teb ntawm cov txheej dawb thiab pearlite, ua rau tsis ua hauj lwm ntxov ntawm txoj kev tsheb ciav hlau [1], raws li qhia hauv daim duab 1 (a). Thaum lub sij hawm polishing txheej txheem, qhov saum npoo ntawm cov hlau rail undergoes txawv qib ntawm oxidation, ua rau cov xim sib txawv ntawm polished rail. Daj, xiav, thiab ntshav liab feem ntau hu ua "hlawv". Lin et al. [9] muab tso rau ib qho khoom siv thermocouple nyob rau hauv cov hlau rail los saib xyuas qhov kub ntawm polishing interface nyob rau hauv lub sij hawm ntawm qhov sib txawv polishing tsis. Lawv muab piv rau polishing kub nrog cov degree ntawm kub hnyiab nyob rau saum npoo ntawm steel rail thiab tsim ib tug kev sib raug zoo qauv ntawm lub degree ntawm hlawv (xim hloov) thiab polishing kub, raws li qhia nyob rau hauv daim duab 1 (b). Ntawm no, Zhou et al. [3] tsim ib qho qauv kev sib raug zoo ntawm qhov kub thiab qhov tuab thiab kev tua hluav taws ntawm cov txheej dawb thaum lub sij hawm rail polishing, muab ib txoj kev tshiab rau optimizing rail polishing tsis, raws li qhia nyob rau hauv daim duab 1 (c). Cov kev tshawb fawb saum toj no qhia tau hais tias optimizing kev sib tsoo tsis thiab txo kev sib tsoo cua sov yog txoj hauv kev tseem ceeb rau kev txhim kho tsheb ciav hlau.

Figure.1 Kev sib tsoo induced rail hlawv thiab dawb etching laywer (WEL)

Ntau tus kws tshawb fawb tshawb nrhiav cov txheej txheem ntawm kev tsheb ciav hlau sib tsoo kub hnyiab los ntawm kev xav ntawm kev sib tsoo pob zeb tsim. Cov txiaj ntsig tshawb fawb ntawm Zhang et al. [2] qhia tias dawb corundum sib tsoo pob zeb muaj qhov zoo tshaj plaws tus kheej sharpness thiab qhov tseem ceeb tshaj plaws sib tsoo nyhuv, uas ua rau lub siab tshaj plaws sib tsoo kub thiab loj tshaj plaws dawb txheej thickness. Yuan et al. [4] prefabricated lub pore qauv hauv cov pob zeb sib tsoo, uas yog qhov zoo rau kev tawm ntawm kev sib tsoo cov khib nyiab, txo cov pob zeb sib tsoo, txo qhov sib tsoo kub, thiab txhim kho qhov zoo ntawm polished steel rail. Wang et al. [5] tau tshawb fawb txog kev cuam tshuam ntawm kev sib tsoo pob zeb hardness (N, R, P, T) ntawm qhov zoo ntawm cov hlau ntsia hlau, thiab cov txiaj ntsig tau pom tias cov tuab ntawm cov txheej dawb tau nce ntxiv nrog qhov nce ntawm kev sib tsoo pob zeb hardness. Yog li ntawd, kev cai tsim nyog ntawm kev sib tsoo pob zeb qauv (pores, abrasive muaj pes tsawg leeg), hardness, thiab lwm yam muaj txiaj ntsig zoo rau kev txhim kho kev tsheb ciav hlau.

Cov kev tshawb fawb saum toj no qhia tau hais tias kev sib tsoo tsis zoo thiab kev sib tsoo pob zeb ua haujlwm yog ob yam tseem ceeb cuam tshuam rau kev sib tsoo tsheb ciav hlau. Rau cov tsheb polishing uas twb muaj lawm ntawm txoj kev, nws yog ib qho nyuaj rau kev hloov kho tseem ceeb rau cov kev khiav hauj lwm tsis zoo ntawm cov qauv tsheb uas twb muaj lawm txhawm rau xyuas kom polishing efficiency. Yog li ntawd, kev tsim thiab kev tswj ntawm kev sib tsoo pob zeb qauv yog ib txoj hauv kev zoo los txhim kho kev tsheb ciav hlau. Wu et al. [7, 8] implanted brazed pob zeb diamond prefabricated blocks nyob rau hauv ib qho kev npaj rau hauv cov pob zeb sib tsoo, raws li qhia hauv daim duab 2 (a). Cov txiaj ntsig polishing qhia tau hais tias cov pob zeb sib xyaw ua ke tuaj yeem txhim kho kev ua haujlwm ntawm kev tsheb ciav hlau polishing, txo qhov roughness ntawm polished rail, thiab txhim kho tsheb ciav hlau. Zhao Jinbo et al. [9] bonded CaF2 nrog polyetheretherketone los ua tus kheej-lubricating ob leeg blocks, thiab npaj nws tus kheej-lubricating sib tsoo pob zeb los ntawm muab tso rau hauv lub sib tsoo pob zeb embryo, raws li qhia nyob rau hauv daim duab 2 (b). Cov txiaj ntsig sib tsoo pom tau tias tus kheej-lubricating sib koom ua ke tuaj yeem tso tawm tsis tu ncua ntawm qhov sib cuam tshuam ntawm cov pob zeb sib tsoo thiab cov tsheb ciav hlau raws li cov pob zeb sib tsoo hnav, txo kev sib tsoo kub thiab txhim kho kev tsheb ciav hlau. Implanting brazed prefabricated blocks, nws tus kheej-lubricating ob leeg blocks, thiab lwm yam rau hauv kev sib tsoo pob zeb matrix tshwm sim nyob rau hauv lub sib tsoo pob zeb qauv thiab qhia ib tug tsawg zog interface (sib tsoo zeb matrix / cog block interface), yog li xyuas kom meej cov neeg kho tshuab zog (rotational zog, dynamic tshuav nyiaj li cas, thiab lwm yam) ntawm lub composite qauv sib tw. Wu et al. [10] tsim ib lub brazed CBN abrasive sib tsoo log nrog ib tug slit raws li qhia nyob rau hauv daim duab 2 (c), uas txhim kho qhov hlawv ntawm rail workpieces. Txawm li cas los xij, cov txheej txheem brazing siv nyob rau hauv cov pob zeb sib tsoo muaj kev hnav tsis zoo thaum lub sij hawm sib tsoo txoj kev tsheb ciav hlau, thiab kev pab cuam lub neej ntawm cov pob zeb sib tsoo yog luv heev. Yog li ntawd, tsim nyog tsim / kev cai ntawm kev sib tsoo pob zeb qauv muaj txiaj ntsig zoo ntawm kev txo qis kev sib tsoo kub thiab txhim kho kev tsheb ciav hlau kub hnyiab, tab sis nws yog ib qho yuav tsum tau ua kom tiav los xyuas kom meej tias cov pob zeb sib tsoo muaj lub cev zoo thiab tshuaj lom neeg thiab ua haujlwm tau zoo.

(a) Preset pob zeb diamond thaiv kev sib tsoo pob zeb [7,8]

(b) Preset Self-lubricating thaiv kev sib tsoo pob zeb[9](c) Slit structured sib tsoo pob zeb [10]

Daim duab 2. Cov qauv tsim ntawm kev sib tsoo pob zeb

Kev siv

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[2]GUO Shuai, ZHAO Xiangji, HE Chenggang, et al. Qhov cuam tshuam ntawm kev sib tsoo cov cim rau kev qaug zog ntawm txoj kab tsheb ciav hlau hauv qab dej txias[J]. Tuam Tshoj Mechanical Engineering, 2019, 30(08): 889-895.

[3] 36[3] Zhou Kun, DING Haohao, Steenbergen Michaël, et al. Kub teb thiab cov khoom teb raws li kev ua haujlwm ntawm Rail Sib Tsoo Parameters [J]. International Journal of Heat and Mass Transfer, 2021, 175: 12366.

[4]YUAN Yongjie, ZHANG Wulin, ZHANG Pengfei, et al. Porous sib tsoo log mus rau Alleviating Pre- nkees nkees thiab nce cov khoom tshem tawm Efficiency rau Rail sib tsoo [J]. Tribology International, 2021, 154: 106692

[5] Wang Ruixiang, ZHOU Kun, Yang Jinyu, et al. Cov teebmeem ntawm Abrasive Materials thiab Hardness ntawm Sib Tsoo Log ntawm Rail Sib Tsoo Cwj Pwm [J]. Hnav, 2020, 454-455: 203332.

[6] 57[6] Zhang Wulin, ZHANG Pengfei, ZHANG Jun, et al. Kev soj ntsuam qhov cuam tshuam ntawm Abrasive Grit Loj ntawm Rail Sib Tsoo Cwj Pwm [J]. Phau ntawv Journal of Manufacturing Processes, 2020, 53: 388-395.

[7] XIAO Bing, XIAO Haozhong, XIAO Bo, et al. Sib tsoo log rau High-efficiency Rail Sib Tsoo thiab nws txoj kev tsim khoom: Tuam Tshoj, CN 108453638 A[P]. 2018-08-28.

[8] WU Hengheng, XIAO Bing, XIAO Haozhong, et al. Hnav cov yam ntxwv ntawm Brazed Pob Zeb Diamond Sheets nrog sib tsoo lub sij hawm sib txawv [J]. Hnav, 2019, 432-433: 202942.

[9] WU Hengheng, XIAO Bing, XIAO Haozhong, et al. Kawm txog Kev Coj Tus yam ntxwv ntawm Brazed Pob Zeb Diamond Sheet rau Rail's Composite Sib Tsoo Log nyob rau hauv qhov sib txawv siab [J]. Hnav, 2019, 424-425: 183-192.

[10] LIN Bin, ZHOU Kun, GUO Jun, et al. Kev cuam tshuam ntawm kev sib tsoo tsis sib thooj ntawm qhov kub thiab txias ntawm kev sib tsoo Rail[J]. Tribology International, 2018, 122: 151-162.