Cov xov raug raug qib ntawm Rail Bolts thiab lawv txoj kev ntseeg siab hauv Kev Tiv Thaiv -Losing Raws li hnyav hnyav
Yuav ua li cas cov xov raug cov chav kawm cuam tshuam rau preload uniformity ntawm khiav bolts?
Xov tseeb feem ntau tswj qhov kam rau ua ntawm lub suab kab, suab, thiab xov ib nrab -lub kaum sab xis. High- xov precision (piv txwv li, 6g) muaj qhov nqaim kam rau ua qhov chaw, cov hniav tag nrho, thiab qhov chaw roughness tsawg (Ra Tsawg dua lossis sib npaug li 1.6μm), ua rau me me, tsis sib xws nrog cov txiv ntseej. Thaum lub sij hawm nruj, preload yog sib npaug ntawm txhua txoj xov, nrog rau qhov zoo tshaj plaws loaded 1st -3rd threads bearing kwv yees li 70% ntawm load. Cov xov tsis tshua muaj tseeb (piv txwv li, 8g lossis tsis muaj cim) muaj burrs, ellipticity, lossis pitch yuam kev, ua rau muaj kev sib koom ua ke tsis sib xws thiab thauj khoom siab ntawm 1st xov. Qhov no ua rau nquag xov shear tsis ua hauj lwm thiab tom ntej preload poob.
Vim li cas cov nag xob nag cua- cov kab cuam tshuam muaj qhov xav tau ntawm cov xov raug siab dua li cov kab zoo tib yam?
Hard quartz xuab zeb hais nyob rau hauv cov cheeb tsam sandstorm tau nkag mus rau cov xov sib koom ua ke. Micro-dents ntawm crest thiab hauv paus ntawm qis- cov xov precision ua "natural av ntxiab" rau cov xuab zeb. Xuab zeb intrusion ua ib qho abrasive ntawm cov xov, ua kom cov hniav hnav thiab ua kom haum qhov tseeb. Nyob rau tib lub sijhawm, xuab zeb ua rau muaj qhov sib txawv ntawm kev sib txhuam coefficient ntawm cov xov, txo qis kev hloov pauv kev ua haujlwm ntawm nruj torque thiab preload. Cov npoo du thiab cov qhov sib txawv ntawm qhov siab - cov xov precision txo cov xuab zeb adhesion thiab intrusion, ncua kev hnav thiab tuav ntev -lub sij hawm los tiv thaiv-loosing efficiency.
Cov chav kawm sib txawv ntawm cov xov raug cuam tshuam li cas rau kev ua haujlwm ntawm kev tiv thaiv -loosing washers (xws li, wedge lock washers)?
Wedge lock washers tsim lub zog xauv los ntawm cov txheeb ze zawv zawg ntawm cov npoo -zoo li tus bevels, uas nws cov txiaj ntsig zoo yog nyob ntawm qhov bolt axial nruj thiab preload stability. High- cov xov precision kom ruaj khov axial txhav thiab qeeb preload decay tom qab zawm, ua kom cov wedge washers nyob rau hauv ib tug zoo xauv lub xeev. Tsawg- cov xov precision ua rau me me "pitch backlash" hauv bolts hauv kev co; Qhov no axial creep offsets cov nyhuv xauv ntawm wedge washers, ua rau tsis ua hauj lwm. Kev ntsuam xyuas qhia tau hais tias nyob rau hauv cov xwm txheej zoo sib xws, qhov ua tsis tiav ntawm kev tiv thaiv -loosing washers nrog 8g bolts yog tshaj plaub npaug ntawm 6g bolts.
Dab tsi yog Suav tus qauv specifications rau kev khiav bolt xov raug cov chav kawm, thiab dab tsi ntxiv yuav tsum tau siv rau tshwj xeeb tej yam kev mob?
Tuam Tshoj "Rail Transit - Track Fasteners - Bolts" qhia 8g xov raug rau cov kab bolts zoo tib yam, nrog rau kev kam rau ib GB/T 197. Rau cov xwm txheej tshwj xeeb (siab- nrawm, hnyav-haul, sandstorm, alpine), tus qauv qhia meej meej.6 yuav tsum tau kho dua tshiab. Hauv thaj tsam alpine, qhov ntxiv "tsawg-kub xov qhov raug tuav" yuav tsum tau ntxiv: tom qab kev cuam tshuam txias ntawm -40℃, lub bolt lub pitch txoj kab uas hla yuav tsum tsis pub tshaj qhov txwv. Qhov no yog vim qhov kub thiab txias ua rau steel contraction; tsis txaus clearance nyob rau hauv tsawg-precision threads ua rau xov galling (seizing).
Yuav ua li cas txhawm rau txheeb xyuas cov chav kawm muaj txiaj ntsig zoo ntawm -qhov chaw siv cov txheej txheem yooj yim thaum tsim kho?
Ua ntej, kev tshuaj xyuas qhov muag: siab- cov xov muaj tseeb (6g) muaj cov ntse ntse, burr- cov npoo dawb, cov hauv paus hniav du, thiab cov xim hlau tsis zoo. Tsawg- cov xov precision muaj dull, txawm chipped npoo thiab ib tug ntxhib nto. Thib ob, kev sim nrog "xov mus / tsis yog-go gauges": qhov kev ntsuas mus yuav tsum dhau los ntawm tag nrho qhov ntev kom zoo, thaum tsis muaj -go gauge yuav tsum tsis txhob nkag lossis nkag los ntawm tsis pub dhau ob zaug. Thaum kawg, "tightening feel" kev sib piv: siab - qhov tseeb bolts nthuav tawm torque tsis tu ncua tsis muaj jamming; tsawg- cov ntsia hlau qhov tseeb qhia qhov tsis sib xws ntawm qhov sib txawv ntawm qhov sib txawv thiab kev sib tsoo, qhia qhov sib txawv ntawm qhov sib txawv.