Cov kev daws teeb meem zoo tshaj plaws rau kev sib tsoo tshuab ua cov teeb meem hauv keeb kwm

1, Cov yam ntxwv cuam tshuam rau saum npoo roughness ntawm cov tshuab sib tsoo thiab lawv cov kev ntsuas kev txhim kho
(1) Cov yam ntxwv muaj feem xyuam rau kev sib tsoo log. Feem ntau cov particle loj, hardness, thiab hnav khaub ncaws ntawm lub sib tsoo log.
Qhov zoo dua qhov me me ntawm lub log sib tsoo, qhov ntau abrasive hais muaj nyob rau hauv ib cheeb tsam ntawm kev sib tsoo log, qhov zoo dua qhov khawb ntawm qhov sib tsoo, thiab qhov me me ntawm qhov roughness tus nqi. Txawm li cas los xij, yog tias qhov loj me me dhau lawm, lub log sib tsoo yog qhov ua rau txhaws, ua rau muaj qhov nce ntawm qhov roughness, nrog rau cov cim ntawm ripples thiab ua rau kub hnyiab.
Lub hardness ntawm lub log sib tsoo yog hais txog qhov nyuaj ntawm cov khoom abrasive poob ntawm lub log tom qab raug kev sib tsoo quab yuam. Kev sib tsoo lub log yog ib qho nyuaj heev, thiab cov khoom abrasive tsis tuaj yeem poob tom qab hnav, ua rau muaj kev sib txhuam thiab compression ntawm qhov chaw ua haujlwm, ua rau cov yas deformation, nce qhov roughness, thiab kuj yooj yim ua rau kub hnyiab; Yog hais tias lub sib tsoo log yog mos heev, cov khoom abrasive yog nquag ntog, cov nyhuv sib tsoo tsis muaj zog, thiab tus nqi ntawm qhov roughness yuav nce ntxiv. Yog li ntawd, nws yog ib qhov tsim nyog los xaiv qhov tsim nyog hardness ntawm lub sib tsoo log.
Qhov zoo ntawm kev sib tsoo log hnav yog zoo sib xws nrog cov cuab yeej hnav khaub ncaws siv thiab qhov ntev pub tus nqi ntawm kev hnav khaub ncaws sib tsoo. Kev hnav khaub ncaws ntawm kev sib tsoo lub log yog siv pob zeb diamond kom tshem tawm cov khoom siv abrasive nyob rau txheej txheej txheej ntawm cov khoom sib tsoo, ua rau txiav ntug ntawm cov khoom abrasive ntse thiab txo tus nqi roughness ntawm qhov sib tsoo. Tsis tas li ntawd, qhov me me ntawm qhov ntev pub tus nqi rau hnav lub log sib tsoo, qhov txiav ntau dua micro npoo ntawm lub log hnav, thiab qhov zoo dua qhov contour, yog li tau txais cov nqi me me ntawm qhov roughness.
(2) Cov yam ntxwv muaj feem xyuam rau cov khoom siv ua haujlwm. Xws li hardness, plasticity, thermal conductivity, thiab lwm yam.
Lub hardness, plasticity, thiab thermal conductivity ntawm cov khoom siv ua haujlwm muaj qhov cuam tshuam loj rau qhov roughness ntawm qhov chaw. Cov ntaub ntawv mos xws li aluminium thiab tooj liab alloys yog qhov yooj yim rau txhaws lub log sib tsoo, ua rau nws nyuaj rau kev zom. Thaum tshav kub kub resistant alloys nrog high plasticity thiab tsis zoo thermal conductivity yog feem ntau rau thaum ntxov vau ntawm cov xuab zeb hais, ua rau ib tug nce nyob rau hauv nto roughness thaum sib tsoo.
(3) Cov yam ntxwv ntsig txog kev ua haujlwm. Nrog rau kev sib tsoo tus nqi, txias txias, precision thiab kev co kuj ntawm cov txheej txheem system, thiab lwm yam.
Cov kev sib tsoo tsis muaj xws li kev sib tsoo log ceev, workpiece ceev, sib tsoo qhov tob, thiab longitudinal pub tus nqi. Los ntawm kev ua kom nrawm ntawm lub log sib tsoo, qhov kev nthuav tawm ceev ntawm cov yas deformation ntawm cov hlau saum npoo yuav tsis ua raws li kev sib tsoo ceev, thiab cov khoom siv yuav tsis muaj sij hawm txaus rau deform, uas ua rau txo qis ntawm qhov roughness nqi ntawm cov khoom. sib tsoo nto. Qhov ceev ntawm lub workpiece nce, cov yas deformation nce, thiab tus nqi nto roughness nce. Qhov ntau dua qhov sib tsoo qhov tob thiab qhov ntev ntawm cov khoom noj, qhov ntau dua cov yas deformation, yog li ua rau tus nqi ntawm qhov roughness. Thaum sib tsoo nrog kev sib tsoo lub log, qhov kub thiab txias yog siab, thiab cov nyhuv ntawm cov cua sov yog qhov tseem ceeb, yog li lub luag haujlwm ntawm kev txiav cov kua dej yog qhov tseem ceeb heev. Kev siv cov kua txiav tuaj yeem txo qhov kub ntawm qhov sib tsoo, txo qhov kub hnyiab, ntxuav tawm cov xuab zeb thiab cov chips poob, thiab tsis txhob khawb cov khoom ua haujlwm, yog li txo cov nqi roughness. Tab sis cov txheej txheem txias kom tsim nyog thiab txiav cov kua dej yuav tsum tau xaiv.
Tsis tas li ntawd, rau sab nraud cylindrical sib tsoo tshuab, sab hauv cylindrical sib tsoo tshuab, thiab nto sib tsoo tshuab, spindle raug ntawm cov sib tsoo log, qhov tseeb thiab ruaj khov ntawm cov khoom noj, qhov nruj thiab kev vibration tsis kam ntawm tag nrho cov cuab yeej tshuab yog ze ze rau. nto roughness.
Cov yam ntxwv saum toj no cuam tshuam rau saum npoo av tau raug tshuaj xyuas. Yuav ua li cas txo qhov roughness tus nqi ntawm cov txheej txheem nto, ntxiv rau kev ntsuas los ntawm cov saum toj no, kuj tuaj yeem txhim kho los ntawm kev ua, xws li kev sib tsoo, honing, ultra precision machining, polishing, thiab lwm yam.
2, Kev hnav khaub ncaws rau kev sib tsoo log
Sharpening yog txheej txheem ntawm sharpening cov nplej abrasive ntawm ib tug superhard sib tsoo log. Nyob rau hauv cov txheej txheem no, nws yog tsim nyog los tshem tawm cov binder ntawm lub abrasive hais thiab npub sib tsoo log abrasive hais, kom lub sib tsoo log abrasive hais nrog muaj zog sib tsoo kev ua tau zoo protrude los ntawm lub binder thiab tsim ntse txiav npoo. Sharpening yuav tsum tau tshem tawm cov khoom me me los ntawm lub qhov hws ntawm qhov chaw sib tsoo kom tsis txhob muaj kev sib tsoo quab yuam ua rau lub log. Qhov kev sib tsoo quab yuam ntawm lub log yuav ua rau muaj kev vibration thiab ua rau kub hnyiab ntawm qhov chaw.
Yog tias tsis muaj kev sib tsoo kom zoo, txawm tias lub log sib tsoo zoo tshaj plaws tsis tuaj yeem ua tiav qhov zoo thiab qhov sib xws ntawm cov khoom ua tiav. Qhov tseeb, thaum koj nqis peev hauv kev sib tsoo zoo, nws yog ib qho tseem ceeb heev uas yuav tsum tau txiav lawv kom zoo thiaj li ua tiav kev sib tsoo zoo.
Shaping tuaj yeem hais tias yog ib feem ntawm kev npaj ua haujlwm rau kev sib tsoo lub log, uas yog ua tiav ib txhij nrog kev sib tsoo ntawm cov log sib tsoo zoo tib yam. Rau superhard abrasive sib tsoo lub log, ob txheej txheem yog nqa tawm nyias, thiab lub log sib tsoo yog thawj zaug. Nyob rau hauv kev siv cov superhard abrasive sib tsoo log, shaping yog nqa tawm siv shaping cov cuab yeej los yog chais, thiab sharpening feem ntau yog ua los ntawm ib tug ceramic bonding pas nrig. Tom qab shaping tiav, lub sib tsoo log yog sharpened.
Nws yog ib qho tseem ceeb los xyuas kom meej tias cov spindle bearings yog nyob rau ntawm ib tug tej yam kub thiab txias (xws li ib txwm sib tsoo lub xeev ntawm lub sib tsoo log) ua ntej lub sib tsoo log, xws li shaping thiab sharpening, yog kho. Qhov no tuaj yeem zam kev puas tsuaj rau cov duab geometric ntawm cov khoom thiab kev coj txawv txawv ntawm kev sib tsoo log thiab cov cuab yeej hnav khaub ncaws. Cov cuab yeej siv los kho yuav tsum tau ua tib zoo saib xyuas, vim lawv feem ntau yog ua los ntawm cov tawv tawv, hnav-tiv taus tab sis cov khoom siv pob zeb diamond nkig thiab muaj kev nkag siab zoo rau cov kab nrib pleb me me thiab pob txha tawg los ntawm kev sib tsoo me ntsis thiab kev ntxhov siab.
Raws li lub pob zeb diamond shaper nws tus kheej yog cov cuab yeej txiav, nws yuav tsum tau ceev heev. Kev siv cov khoom siv npub hnav los ua kom lub ntsej muag sib tsoo yuav ua rau nws du. Yuav kom tswj tau cov cuab yeej zoo thiab ntse pob zeb diamond hnav khaub ncaws, nws yog ib qho tsim nyog yuav tsum tig ib qho taw tes lossis taw tes hnav khaub ncaws hauv 1/8 ntawm lub voj voog ntawm ib ntus. Tus naj npawb ntawm kev sib hloov tuaj yeem txiav txim siab raws li qhov kho qhov teeb meem, thiab raws li kev paub dhau los, nws yuav tsum tau tig tsawg kawg ib zaug ib hnub. Rau chisel hau thiab shaping cov cuab yeej, lawv feem ntau yuav tsum tau tig 180 degree ua ntej lawv yuav npub.
Feem ntau cov cylindrical grinders tso cov khoom thiab sib tsoo log ntawm kab rov tav. Qhov siab tshaj plaws ntawm lub voj voog sab nrauv ntawm qhov chaw thiab qhov siab tshaj plaws ntawm lub voj voog sab nrauv ntawm lub log sib tsoo yog hu ua qhov chaw sib cuag ntawm qhov / sib tsoo log. Cov cuab yeej hnav khaub ncaws pob zeb yuav tsum txiav lub log sib tsoo kom ze li sai tau mus rau qhov chaw sib cuag ntawm qhov / sib tsoo log. Rau kev sib tsoo log siv nyob rau hauv lub tshuab sib tsoo, nws yog ib qho tseem ceeb uas yuav tsum tau siv lub pob zeb diamond hnav cov cuab yeej mus rau qhov siab tshaj plaws ntawm lub voj voog sab nrauv ntawm lub log sib tsoo (piv txwv li qhov chaw sib cuag ntawm ib feem thiab lub log sib tsoo thaum lub qhov sib tsoo) rau hnav khaub ncaws.
Siv cov kev hloov kho micro
Zoo li muaj kev ntxias kom xaiv qhov tob ntawm qhov txiav kom loj dua kom txo tau lub sij hawm xav tau rau kev txiav. Qhov no yog ib lub tswv yim tsis ncaj ncees lawm. Lub log sib tsoo yuav tsum tau muab txiav rau ntawm qhov tob uas haum tshaj plaws. Xaiv qhov tob trimming loj heev tuaj yeem ua rau muaj qhov kub thiab txias, txo qhov kev pab cuam lub neej ntawm cov trimmer, thiab txawm txiav tawm cov txheej txheem sib tsoo zoo. Qhov kawg tshwm sim yog ua kom puas lub trimmer thiab lub sib tsoo log, uas yog counterproductive. Qhov zoo tshaj plaws ntawm trimming yog raws li lub hauv paus ntsiab lus uas tom qab ob peb rounds ntawm trimming, lub geometric duab ntawm lub sib tsoo log yuav rov qab tau thiab ib tug zoo sib tsoo ntug yuav precisely tsim. Thaum siv ib qho taw tes hnav khaub ncaws, txoj kab uas hla ntawm kev sib tsoo lub log yuav tsum nyob rau hauv kev sib cuag nrog lub axis ntawm lub kaum sab xis ntawm 10-15o. Qhov no yuav tsim cov nyhuv sharpening thaum ib tug taw tes trimming cuab tam rotates tsis tu ncua. Multi-point contact trimming tool tsis tas yuav tilted ntawm lub kaum sab xis no. Hloov mus rau kev siv tag nrho lub ntsej muag kawg ntawm lub cuab yeej trimming kom sib cuag nrog lub ntsej muag ntawm lub log sib tsoo.
Kev txav mus los ntawm sab nraud yog qhov ceev uas cov cuab yeej hnav khaub ncaws hla ntawm qhov sib tsoo lub log thaum lub sijhawm hnav khaub ncaws. Nws plays lub luag haujlwm tseem ceeb hauv qhov chaw roughness thiab hlau txiav tus nqi uas yuav tsum tau ua rau machining qhov chaw. Yog hais tias lub lateral txav ceev qeeb dhau, nws yuav thaiv lub log sib tsoo, ua rau lub ntsej muag roughness thiab hlau txiav tus nqi ntawm cov khoom. Kev qeeb qeeb qeeb qeeb tuaj yeem ua rau lub log sib tsoo thiab hlawv qhov chaw ntawm qhov chaw. Ib qho kev sib tsoo thiab nrawm nrawm nrawm tuaj yeem ua rau lub ntsej muag sib tsoo, txhim kho nws cov kev sib tsoo, ua kom sib tsoo efficiency, thiab txo qhov roughness ntawm qhov chaw.
Khaws cia txias
Kev siv cov dej txias kom zoo tuaj yeem ua kom kho sai thiab txhim kho kev ua haujlwm. Raws li kev paub dhau los, xaiv 3/8-inch inch diam coolant tuaj yeem tshem tawm cov cua kub ntau ntawm cov trimmer thiab txuas nws lub neej kev pab. Thaum cov cuab yeej hnav khaub ncaws pob zeb diamond hla dhau lub log sib tsoo, nruab ib lub tshuab ua kom txias uas npog tag nrho qhov chaw ntawm lub log sib tsoo los yog txuas ntxiv cov dej txias rau lub pob zeb diamond hnav cov cuab yeej. Thaum cov cuab yeej kho tau los rau hauv kev sib cuag nrog lub log sib tsoo thiab pib kho, tsis txhob cia lub cuab yeej kho kom raug tshem tawm ntawm lub coolant. Txwv tsis pub, nws yuav ua rau tawg lossis tawg hauv lub pob zeb diamond hnav cov cuab yeej nyob rau hauv qhov kub thiab txias hloov ntawm txias thiab kub.
Kev siv cov lim dej kom pom tseeb ntawm cov dej txias tuaj yeem tiv thaiv ntau lub voj voog ntawm cov av lossis cov chips hauv lub coolant. Cov dej tsis huv tuaj yeem ua rau lub log sib tsoo kom hnav sai sai thiab ua rau muaj kev sib tsoo lub log ntau zaus. Kev hnav khaub ncaws qhuav ntawm kev sib tsoo lub log tsuas yog nqa tawm thaum lub sij hawm sib tsoo qhuav (nyob rau hauv rooj plaub no qhov txias ntawm lub pob zeb diamond hnav cov cuab yeej tuaj yeem cuam tshuam). Ua ntej ua tiav kev ua haujlwm txhua hnub, tua lub coolant thiab cia cov xuab zeb log khiav tas li ob peb feeb. Qhov no tuaj yeem tiv thaiv lub log sib tsoo los ntawm kev tawg.
Kev vibration yog tus yeeb ncuab ntawm kev kho
Nws yog ib qho tseem ceeb kom ua tau zoo txo ​​kev co, tsis txhob tawm hauv kev kho cov cim, kev sib tsoo, thiab kev puas tsuaj rau kev kho cov cuab yeej ntawm qhov chaw sib tsoo thaum lub sij hawm sib tsoo log. Qhov no txhais tau hais tias nws tseem yuav tsum tau tswj kom muaj qhov sib npaug ntawm lub log sib tsoo, uas yog txiav txim siab los ntawm cov yam ntxwv ntawm lub log sib tsoo nws tus kheej. Qhov tsis sib thooj thiab cov duab geometric tag nrho ntawm cov kev sib tsoo log tau ob qho tib si cuam tshuam txog kev sib tsoo ntawm lub log sib tsoo. Yog li ntawd, xaiv lub zoo sib tsoo log kuj tseem ceeb heev. Yog hais tias nws yog ib tug zoo zoo sib tsoo log, tsuas yog tsim nyog installation yuav tsum tau kom muaj zoo tshuav nyiaj li cas ntawm cov sib tsoo log. Raws li cov chaw tsim tshuaj paus lub Hoobkas cov lus qhia, lub sib tsoo log yog cim nrog ib tug upward xub, uas qhia lub teeb kawg orientation ntawm lub sib tsoo log tom qab ntxhib sib npaug. Tom qab ntawd cov neeg siv tuaj yeem ua raws li cov lus qhia xub xub thiab ua tib zoo saib xyuas kev sib tsoo lub log kom ua tiav qhov sib npaug dynamic. Ntxiv cov coolant sib npaug tuaj yeem qee zaum pab lub log sib tsoo kom muaj kev sib npaug.
Txhawm rau kom tsis txhob muaj kev vibration ntxiv, nws yog ib qho tsim nyog yuav tsum xyuas kom meej tias cov cuab yeej trimming yog ruaj khov rau ntawm lub clamp thiab tuav qhov tsawg kawg nkaus overhang kom ntseeg tau tias cov cuab yeej trimming muaj qhov rigidity txaus. Yog tias lub cuab yeej pob zeb diamond tsis ruaj khov, nws yuav ua rau muaj kev vibration, tsim suab nrov, tsim ripples ntawm qhov chaw ntawm qhov chaw, lim qhov chaw ntawm qhov chaw, thiab ua rau cov cuab yeej kho puas.
Lub log superhard abrasive yuav tsum tau zoo li tus thiab sharpened ua ntej pib sib tsoo. Ua raws li cov kev paub dhau los hauv tsab xov xwm no yuav pab koj lub log sib tsoo tsim cov kev sib tsoo zoo tshaj plaws.
3, Kev cuam tshuam ntawm kev sib tsoo tshuab raug ntawm kev ua haujlwm raug ntawm cov khoom ua haujlwm
Qhov tseeb geometric, nruj, thermal deformation, kev ruaj ntseg ntawm kev txav, thiab kev co tsis kam ntawm cov tshuab sib tsoo yuav cuam tshuam ncaj qha rau kev ua haujlwm raug ntawm cov khoom ua haujlwm.
(1) Qhov tseeb geometric ntawm lub tshuab sib tsoo yog hais txog qhov tseeb ntawm kev txav thiab kev sib nrig sib raug zoo ntawm txhua yam khoom tsis muaj kev thauj khoom. Nws yog tsis yooj yim sua los tsim cov cuab yeej siv lub tshuab nrog qhov tseeb, vim tias muaj qhov yuam kev ntau dua lossis tsawg dua. Hom kev ua yuam kev no yuav cuam tshuam rau qhov sib txawv ntawm cov khoom ua haujlwm thaum lub sijhawm ua haujlwm, cuam tshuam rau nws qhov tseeb machining. Feem ntau, muaj radial runout thiab axial hloov chaw ntawm spindle, ncaj ntawm kev txav ntawm qhov chaw txav xws li lub rooj zaum ua haujlwm, qhov tsis raug ntawm qhov chaw thiab kev sib kis ntawm qhov chaw ua haujlwm.
Lub radial runout thiab axial hloov chaw ntawm kev sib tsoo log spindle, nrog rau qhov loj txav tsis raug ntawm lub tshuab sib tsoo lub taub hau, tsis tsuas yog cuam tshuam rau qhov roughness ntawm lub workpiece tom qab sib tsoo, tab sis kuj ua rau roundness thiab kawg lub ntsej muag runout ntawm lub workpiece, ua rau. nyob rau hauv tsis sib xws sparks thaum lub sij hawm sib tsoo txheej txheem. Thaum lub worktable txav ntawm lub dav hlau ntsug uas tsis yog perpendicular, nws cuam tshuam qhov ncaj ntawm lub workpiece lub generatrix ntawm lub puab thiab sab cylindrical sib tsoo tshuab, uas ua rau ib tug loj flatness yuam kev ntawm lub workpiece thaum sib tsoo lub dav hlau ntawm lub nto sib tsoo tshuab. Lub centerline ntawm lub sib tsoo log spindle ncej ntawm ib tug sab nraud cylindrical grinder thiab lub centerline ntawm lub sib tsoo log spindle ncej ntawm lub internal cylindrical grinder tsis sib npaug nyob rau hauv qhov siab mus rau lub centerline ntawm lub workpiece taub hau ncej ncej. Thaum sib tsoo lub puab thiab sab hauv lub khob hliav qab, lub workpiece busbar yog hyperbolic nkhaus. Lub centerline ntawm lub sib tsoo log spindle axis tsis yog sib npaug zos rau cov kev taw qhia ntawm lub zog ntawm lub worktable, uas cuam tshuam rau lub flatness ntawm lub workpiece kawg lub ntsej muag tom qab sib tsoo. Kev sib kis yuam kev ntawm lub tshuab sib tsoo muaj qhov cuam tshuam loj rau kev ua haujlwm raug ntawm cov xov sib tsoo thiab iav sib tsoo.
(2) Lub zog ntawm lub tshuab sib tsoo. Nws hais txog lub peev xwm ntawm lub tshuab sib tsoo cov khoom los tiv thaiv deformation thaum raug rau sab nraud quab yuam (sib tsoo quab yuam). Qhov ntawd yog hais tias, nyob rau hauv tib lub zog sib tsoo, qhov me me deformation ntawm cov khoom, qhov ntau dua qhov tawv. Ntawm qhov tsis sib xws, yog tias qhov deformation ntawm cov khoom siv loj, nws qhia tau tias qhov tawv nqaij ntawm cov khoom yog me me. Qhov loj ntawm cov deformations cuam tshuam qhov qub geometric raug ntawm lub xeev zoo li qub ntawm lub tshuab sib tsoo thiab yuav ua rau qhov loj ntawm machining yuam kev hauv lub workpiece. Yog li lub tshuab nrog zoo rigidity muaj siab machining raug rau lub workpiece.
(3) Thermal deformation. Kev faib tawm ntawm cov cua sov hauv lub tshuab sib tsoo tsis sib xws, thiab cov cua sov uas tsim los ntawm txhua qhov chaw thaum lub sij hawm txav kuj txawv. Kev cuam tshuam ntawm cov khoom siv hluav taws xob sab nraud ntawm txhua qhov ntawm lub tshuab cuab yeej kuj txawv. Lub thermal expansion coefficient ntawm cov khoom sib txawv vim cov ntaub ntawv sib txawv, ua rau sib txawv micro deformations nyob rau hauv txhua feem ntawm lub tshuab cuab yeej, uas ua rau ib tug txo nyob rau hauv lub qub geometric qhov tseeb ntawm lub tshuab cuab tam thiab cuam tshuam lub machining raug ntawm lub workpiece. Yog li nws yog qhov zoo tshaj rau nruab ib lub tshuab grinder nyob rau hauv qhov kub thiab txias chamber kom tiv thaiv qhov kub thiab txias los ntawm kev cuam tshuam qhov tseeb ntawm lub tshuab cuab yeej thiab cov khoom ua haujlwm.
(4) Cov khoom txav ntawm cov grinder nkag. Qhov tshwm sim ntawm kev txav tsis sib xws ntawm kev txav mus los xws li kev sib tsoo lub log ntawm lub tshuab sib tsoo worktable thaum lub sij hawm micro periodic pub los yog qis-ceev nruam txav feem ntau hu ua crawling. Thaum qhov tshwm sim no tshwm sim hauv lub tshuab sib tsoo, nws ua rau cov khoom noj tsis sib xws thaum lub sij hawm sib tsoo, uas cuam tshuam rau qhov roughness ntawm lub workpiece thaum sib tsoo.
(5) Kev vibration ntawm lub tshuab sib tsoo. Lub tshuab sib tsoo ua kom muaj kev vibration thaum lub sij hawm sib tsoo, ua rau lub sijhawm hloov pauv ntawm qhov sib txheeb ntawm lub log sib tsoo thiab cov khoom ua haujlwm, ua rau muaj kev vibration qauv ntawm qhov chaw ua haujlwm, uas cuam tshuam rau kev ua haujlwm zoo thiab raug.
Txhawm rau txhim kho qhov tseeb ntawm cov khoom ua haujlwm tom qab sib tsoo, ntxiv rau kev siv zog tshem tawm cov kev cuam tshuam ntawm cov khoom saum toj no, nws tseem yuav tsum tau ua tib zoo saib xyuas qhov tsim nyog ntawm kev siv qhov chaw siv, clamping txoj kev, xaiv thiab kho qhov sib tsoo log, thiab Kev xaiv tsim nyog ntawm kev sib tsoo tus nqi thiab txheej txheem txheej txheem thaum lub sijhawm ua haujlwm ua haujlwm.