Laser Quenching cov khoom siv yog qhov ntsuas cua sov laser laser lasners) kom muaj kev kub ceev ntau dua los ntawm kev ua kom txias dua. Nws cov ntsiab lus zoo nyob rau hauv nws cov kev muaj zog heev, uas tau ua kom muaj kev kub ntxhov me me (0 hli nyob rau hauv kev cuam tshuam kub me me, thiab nkees ua hauj lwm lub zog thaum khaws cia subformation. Cov khoom siv dav hauv cov chaw ua haujlwm hauv tsheb cav, tshuab hluav taws xob, cov tshuaj pwm, thiab cov tshuaj sib zog ua kom muaj zog rau cov kev tsim khoom loj.

Laser Hardening Khoom

Saum npoo hardening, lifespan ntau khoo

Chaw ua uas tsis tau haus	3000W Laser Quenching Tshuab	6000W Laser Quenching Tshuab	Qhov tseem ceeb sib txawv
Phau ntawv
Laser Tau	Fiber laser (1070 nm wavelength)	Fiber laser (1070 nm wavelength)	Tib lub Technology Technology, 6000 hli ua tiav 2x ua kom muaj zog dua.
Max Laser Fais	3000 W (Nruam / Hloov Kho)	6000 W (Nruam / Hloov Kho)	Lub zog ob npaug ntawm → 2x ceev nrawm & tob dua nkag mus.
Hnov qhov loj me	{{0 {}}. 3-4 hli (kho tau los ntawm lub lens)	0. 5-8 hli (kho tau los ntawm lub lens)	Cov chaw loj rau 6000W → zoo dua rau cov tuab tuab-walled (piv txwv li, shafts).
Kev Soj Ntsuam Ceev	20-800 hli / s (khoom siv-vam khom)	50-1500 hli / s (khoom siv-vam khom)	Lub sijhawm luv luv rau cov ntu loj.
Hardened Mater Qhov tob	{{{0}}}. 1-1.0 hli (hlau)	{{{0}}. 2-2.0 hli (hlau)	Cov txheej tob rau 6000W → zoo tagnrho rau cov dej num hnyav-cov plaub ntug.
Siab tshaj plaws workpiece loj	600 × 400 × 200 hli	1200 × 800 × 400 hli	Kev ua tau muaj peev xwm 6000W (piv txwv li, turbine hniav).
Cov khoom siv tau sib xws	Qes / Nruab Nrab Cov Hlau Carbon, Alloy Hlau, Cam Khwb Cia Hlau(HRC tsawg dua los yog sib npaug rau 55)	High-carbon hlau, tuam hlau, titanium alloy(HRC tsawg dua los yog sib npaug rau 62)	6000w tests cov khoom siv nyuaj (piv txwv li, stainless hlau, titanium).
Kev Cua Txias	Dej-Txias	Dej-Txias	Precision Txias rau 6000W kom tiv thaiv kev kub ntxhov thaum lub sijhawm siv hluav taws xob siab.
Nto roughness (ra)	0.8–1.5 μm	0.5–1.2 μm	Finer nto tas rau 6000W (qis dua Thermal gradient).
Zog Efficiency	~70%(nrog fiber ntau optics)	~85% (nrog fiber ntau optics)	Siab dua ua haujlwm rau 6000W vim yog optimized nqaj xa.
Kev ntxhov siab thermal	Qi(nrawm nrawm txo qis kev ntxhov siab)	Tswj kav(Yuav tsum muaj thermal teb tshuaj xyuas)	6000d xav tau AI thermal tswj kom tsis txhob tawg (piv txwv li, aerospace fasteners).
Cov Kev Siv Raug Raug	Cov zog me me, pwm cov kab noj hniav, cov kabmob precision bearings	Lub Cav Crankshafts, cov log tsheb ciav hlau, cov khoom siv thauj khoom aerospace	Lub Hwj Chim txiav txim siab nplai & cov nyom.

Kev Ua Tau Zoo

Kev Ua Tau Zoo & Peev Xwm

6000W: Cov txheej txheem300mm shafts hauv 15 feeb(thiab 30 feeb rau 3000W).
3000W: Zoo tagnrho rauMicron-Qib Precision(piv txwv li, cov hniav hniav nrog ± {0}}. 01mm kam rau hli).

Zoo Tshaj Plaws Zoo

6000W: Nyias oxide txheej (<5μm vs. 10–15μm for 3000W) and Uniform hardness(± 3% sib txawv).
3000W: Zoo dua rauCov geometries complex(piv txwv li, kauv grooves) nrog minimal thermal sib tshooj.
12000W: Paired nrog cov caj npab loj loj lossis cov khoom hnyav hnyav, haum rau cov xwm txheej loj ua cov xwm txheej.

Kev Ntsuam Xyuas Kev Lag Luam

Revi: 6000d them rov qab rau hauv1.5 xyoos for annual production >5, 000 ntu.

Cov khoom lag luam

Laser Quenching tshuab yog lub xeev-of-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the-the or Nruab nrog 1 {{0}}}} ² {} {}}}} degree c) hauv milliseconds. Cov txheej txheem sai sai (cov roj cua khov lossis ua kua nitrogen) ua kom muaj kev sib sib zog nqus cov txheej txheem (0. {Mm} Poj niam tob) nrog lub saum npoo hardness ntawm txog li ntawm HRC 62.

TSEEM CEEB LOJ Muaj xws li:

Micro-qib Precision: ± 5m kev ua kom raug thiab kho tau cov chaw kho kom loj ({{}}. 1-5 mm) rau cov hniav sib txawv xws li cov hniav txhuam hniav.
Tob cryogenic muaj peev xwm: Ua kua nitrogen txias kom ua rau cov khaubncaws sab nraud povtseg nyuaj tshaj 3 mm, zoo tagnrho rau cov dej num hnyav.
Zog Efficiency: 60% qis zog kev noj haus ntau dua li cov txheej txheem ib txwm muaj, ua khub nrog xoom paug paug paug.

Khoom Siv Khoom

Cov Ntawv Thov

Pwm Kev Lag Luam

Hauv pwm tsim, laser tawv ua kom muaj zog nce ntxiv thiab hnav tsis kam ntawm cov pwm, tshwj xeeb tshaj yog qhov raug rau cov neeg siab thiab kub. Qhov kev kho no tuaj yeem txuas ntxiv cov kev pabcuam lub neej ntawm cov pwm, txo cov nqi kho mob, thiab kom cov khoom zoo.

Cov Tsheb Raug Tsheb

Dav siv rau hauv kev tsim cov khoom siv tsheb xws li lub zog, crankshafts, clutches, thiab lwm yam hnav tsis kam thiab qaug zog. Qhov no pab txhim kho kev ntseeg tau thiab ua tau zoo ntawm tag nrho cov tsheb, thaum tseem pab txo cov suab nkauj thiab kev co.

Neeg Kho Tshuab Raug

Hauv kev tsim kho tshuab, laser hardening yog siv los txhim kho cov yam ntxwv saum npoo ntawm ntau qhov chaw thiab crankshafts. Cov tshuaj kho no nthuav tawm cov khoom kim dua hnav thiab ua kom ruaj khov, ua rau muaj cov haujlwm ntev ntawm cov khoom siv thiab txo tus nqi tsis ua haujlwm.

Cov Cuab Yeej Kho Vajtse Kev Lag Luam

Laser harding yog kuj feem ntau yog ua haujlwm hauv cov cuab yeej tsim khoom ntawm cov cuab yeej tsim kho vajtse (xws li txiab, thiab lwm yam. Qhov no tsis yog txuas lub neej ntawm cov cuab yeej tab sis tseem txo cov nqi ntxiv los ntawm lub cuab tam thaum ntxov ua tsis tiav.

Laser Hardening Khoom: Ib qho txheej txheem cej luam ntawm cov txheej txheem, kev siv, thiab cov txiaj ntsig zoo

Cov txheej txheem nyuaj nyuaj yog cov txheej txheem ntawm cov thawj coj ua haujlwm ntawm cov nqaj hlau kom sov rau lawv txoj kev hloov ntsuas kub, pibHloov pauv hauv MicrostructureCov. Thaum qhov ntsuas kub no tau mus txog, qhov chaw sov sov tau txias heev, feem ntau los ntawm huab cua lossis txias, pauv cov qauv qauv nyuaj. Tus txheej txheem no tso cai rau kev tswj kom meej rau ntawm qhov tob thiab qhov chaw zoo ntawm thaj chaw ib puag ncig, ua rau nws zoo rau kev txhim kho lub neej ntawm cov khoom tseem ceeb.

Qhov kev siv tau ntawm laser hardening spans thoob plaws ntau yam lag luam vim nws qhov tseeb thiab ua tau zoo. Nws yog qhov dav nyob rau hauv kev tsim cov txheej txheem uas yuav tsum tau kho cov khoom ua kom zoo, suav nrog kev siv tsheb, tshuab hluav taws xob, thiab tshuab cov cuab yeej siv. Cheebtsam xws li lub zog, cov tshuaj, cov li qub, thiab cov pwm tuaj yeem tau txais txiaj ntsig los ntawm laser hardening rauTxhim Kho Cov Hnav Tsis kam, qaug zog muaj zog, thiabZuag qhia tag nrhoCov. Tsis tas li ntawd, vim tias nws tsis muaj kev sib cuag thiab muaj peev xwm ua kom haum rau cov kev kho mob ua kom zoo nkauj uas yog qhov chaw kho kub ua tsis txaus.

Ntawm cov zauv uas tau zoo ntawm laser hardening, qhov tseem ceeb tshaj plaws yog nws lub peev xwm ua kom tiav qib nyuajNrog tsawg heev distortion, nws cov rov ua dua, thiab ib puag ncig kev phooj ywg. Tsis zoo li cov txheej txheem kho cua sov, laser hardening yuav tsum tsis muaj quenchants, txo cov nqi ib puag ncig thiab cov nqi pov tseg. Ntxiv mus, lub cua sov cua sov minimizes kev ntxhov siab thiab deformation, ua kom zoo sib xws nyob rau hauv cov khoom tsim ntau lawm. Lub automation muaj peev xwm ntawm laser tshuab txuas ntxiv txhawb cov khoom lag luam thaum saib xyuas cov thev naus laus zis rau kev tsim khoom siv niaj hnub rau kev ua haujlwm siab thiab muaj kev ruaj khov.

Ib tug tub rog

Ua haujlwm laser hardening kom nce cov npoo tawv ntawm qhov chaw ua ntej, ntsib cov kev xav tau ntawm siab nyob rau hauv huab.

Pwm tau ua

Siv laser hayzing haerting technology txhawm rau txhim kho cov kev coj ua tsis kam thiab tawv ntawm cov pwm, lub neej kev pabcuam txuas ntxiv thiab ua kom cov khoom lag luam zoo.

Neeg Kho Tshuab Engineering

Thov laser hardening rau cov tseem ceeb ntawm cov tshuab hnyav, ua kom lawv nkees nkees thiab hnav cov yam ntxwv tiv thaiv.

Tuam Raug

Siv laser tawv los txhim kho kev ua haujlwm thiab kav ntev ntawm cov cuab yeej kho vajtse, txo cov nqi cuam tshuam nrog cov cuab yeej tsis ua haujlwm.

Roj thiab roj

Qiv nyooj ua rau txhawb kev kho kom haum thiab hnav tsis kam ntawm cov khoom siv tho thiab cov khoom siv rho tawm, yoog raws ib puag ncig ua haujlwm.

Khoom nta

Siab precision cua sov

Siv lub zog siab ntawm cov kab teeb meem laser no ua rau muaj kev cuam tshuam cua sov uas ua rau muaj kev cuam tshuam nrog cov chaw ua haujlwm tsawg kawg nkaus. Txoj kev ua cua sov rau ib cheeb tsam no kom tsis txhob cuam tshuam thaj chaw uas tsis tas yuav muaj kev kho mob, kom ua tau zoo ntawm kev ua haujlwm zoo.

Cua sov ceev thiab cua txias

Cov txheej txheem hnyav dua tuaj yeem ua tiav hauv lub sijhawm luv luv, feem ntau nyob rau hauv vib nas this los ua kom zoo thiab hnav zoo nkauj, txhim kho cov npoo tawv thiab hnav tsis kam. Vim yog cov cua sov ceev ceev thiab cua txias kom sov, nws ua kom muaj oxidation, tswj kev nyiam huv thiab zoo ntawm lub workpiece nto.

Zog txuag thiab ib puag ncig tus phooj ywg

Piv rau cov txheej txheem kho cua sov ua si, laser hardening yuav tsum muaj tsawg dua lub zog thiab tsis siv ib qho tshuaj lom neeg muaj kuab lom thiab khib nyiab ib puag ncig. Ib qho ntxiv, vim nws lub zog siab hloov pauv tau zoo, hluav taws xob tau noj hluav taws xob yog qhov tsawg, ntxiv txhawb kev tsim khoom ntsuab.

Hide Daim Ntawv Thov Ntau Yam

Nws tuaj yeem siv rau kev kho mob saum npoo ntawm ntau yam khoom hlau thiab cov hlau nplaum, tshwj xeeb yog tsim nyog rau kev txhawb nqa hauv zos xws li gears thiab cov khoom sib xyaw. Los ntawm kho laser tsis, nws tuaj yeem hloov tau cov kev xav tau ntawm cov ntaub ntawv sib txawv thiab cov thicknesses, muab cov kev daws teeb meem customized.

Cov Qib Siab Ntawm Automation

Niaj hnub nimno laser hardening yog ib txwm muaj nruab nrog cov txheej txheem kev txhawb nqa thiab ua haujlwm ua haujlwm tsis zoo no, txhim kho kev ua haujlwm tsis zoo no, txhim kho cov khoom siv tsis zoo no, txhim kho ntau yam ua haujlwm thiab cov khoom lag luam zoo sib xws. Ntxiv mus, cov tshuab saib xyuas saib xyuas ntse tuaj yeem soj ntsuam ntau yam tsis nyob hauv tiag tiag-lub sijhawm ua haujlwm, kom txhua kauj ruam raws li cov qauv preset.

Txo txoj kev pheej hmoo ntawm deformation

Txij li tsuas yog xaiv cua sov ntawm cov chaw ua haujlwm saum npoo Cov xeeb ceem no yog qhov tshwj xeeb tshaj yog qhov tshwj xeeb rau nws tsis tsuas yog nce cov nqi kho tab sis kuj txo cov nqi kho tom ntej thiab kho cov nqi.

Vim li cas thiaj xaiv peb

Guosheng Laser Technology Co., Ltd

Peb coj dhau10 xyoo ntawm kev txawj ntse thiab kev paubNyob rau hauv laser cladding thiab additive manufacturing technologies. Qhov tom qab tom qab no pab peb kom xa cov kev daws teeb meem tshiab uas muaj kev ntseeg siab ntawm kev ntseeg tau thiab txoj kev ntseeg tau.

Cov kws tshaj lij

Peb cov kws tshaj lij muaj cov kws tshaj lij txhawm rau txhawm rau txhawm rau muaj teeb meem tshaj plaws hauv laser ntxiv kev tsim khoom. Los ntawm kev ua kom zoo ntawm cov txheej txheem cladding los daws cov khoom sib xyaw ua ke, peb muab cov kev daws teeb meem uas ua kom muaj txiaj ntsig zoo rau txhua daim ntawv thov.

Daim ntawv pov thawj thiab kev tsim nyog

Peb cov khoom muaj ntawv pov thawj hauv qabISOthiabPiam, kom ua raws li kev ua raws li kev nyab xeeb thoob ntiaj teb thiab kev ua haujlwm zoo. Cov ntawv pov thawj no yog ua tim khawv rau peb txoj kev mob siab rau xa kom muaj zog, cov cuab yeej cia siab uas tau raws li cov kev xav tau ntawm kev lag luam niaj hnub.

10+ xyoo

Paub lawm

Hmoov zoo 500

Kev Koom Tes

ISO & CE

Muaj ntawv tso cai

{{0 {}} Instts.

Kev koom tes

Qhov laj thawj vim li cas cov neeg muas zaub thaum kawg xaiv Guosheng Laser Tshuab

Peb txoj kev cog lus rau qhov zoo tshaj plaws tau khwv tau nyiaj Meskas nrog kev sib koom tes ntev ntev nrog ntauLub Ntiaj Teb-Ua Fortune 500 Cov tuam txhab, ob qho tib si thiab thoob ntiaj teb. Cov kev sib koom tes no underscore peb lub peev xwm los ntsib cov qauv siab tshaj plaws ntawm kev ua tau zoo thiab kev ua tau zoo los ntawm kev lag luam thoob ntiaj teb.

Los ntawm kev xaivGuosheng Laser Technology Co., Ltd, koj tau txais kev nkag mus rau ib tus khub uas ntseeg tau nrog cov pov thawj raws cov ntaub ntawv ntawm kev ua tiav. Peb ua ke ntawm cov kev paub, cov thev naus laus zis siab, thiab cov neeg siv khoom tsis txaus ntseeg los pab cov lag luam ua tiav lawv lub hom phiaj ua tiav thiab muaj txiaj ntsig. Cia peb ua koj txoj kev siv nyob rau hauv kev tsav tsheb ua haujlwm tshiab thiab kev loj hlob los ntawm kev daws teeb meem laser.Peb Daim Ntawv Pov ThawjPeb Daim Ntawv Pov Thawj

ISO 45001: 2018

ISO 9001: 2015

Daim Ntawv Pov Thawj CE

Khoom yuav

FlowCaht

Daim duab no qhia txog kev yuav cov txheej txheem ntawm cov khoom siv laser. Peb txiav txim siab cov khoom lag luam uas xav tau los ntawm kev nkag siab cov neeg siv khoom, thiab tom qab ntawd pib txoj kev sib pauv. Tom qab cov khoom tuaj txog, peb muab kev pabcuam tom qab muag rau cov khoom siv.

Los ntawm kev sib cais customized thiab cov txheej txheem khoom lag luam, peb tuaj yeem faib cov khoom siv tau zoo. Cov haujlwm sib txawv tshwj xeeb hauv txhua theem:kev muag khoomNkag siab txog cov neeg siv khoom xav tau kev pab,R&DSaib xyuas cov ntaub ntawv customization, covpab pawg ntau lawmTsom rau kev tsim khoom,Logisticsua kom muaj peev xwm xa khoom, thiabTom qab muagmuab kev txhawb nqa tas li. Qhov kev faib khoom lag luam no txhawb thiab cov neeg siv khoom txaus siab.

Cov ntawv sau ua xim rau sab xis ntawm daim duab sab xis ntawm cov txheej txheem sib txawv, uas pab kom nkag siab txog qeb uas txhua kauj ruam yog. Piv txwv, lub teeb xiav sawv cev rau cov txheej txheem qhia meej, thiab Daj sawv cev rau cov qauv lag luam, thiab lwm yam.

Nkag siab cov neeg xav tau

Nov yog qhov pib ntawm cov txheej txheem. Thawj kaujruam yog kom tau txais kev nkag siab zoo ntawm cov neeg siv khoom xav tau. Peb ua tiav qhov no los ntawm kev sib tham hauv-tob, thiab kev soj ntsuam ntawm tus neeg siv khoom lag luam.

Khoom Siv Khoom

Raws li cov neeg siv khoom xav tau, muaj ob txoj kev khiav. Rau cov khoom lag luam customized, yuav tsum tau tsom xam, ntsuas kev txiav txim, kev ua kom zoo dua qub, thiab tsim cov txheej txheem kev pom zoo yog nqa tawm hauv ntu zus. Rau cov khoom lag luam, ncaj qha mus rau kev pom zoo thiab them nqi theem.

Kev Hloov Chaw

Tom qab cov qauv tsim qauv ntawm cov khoom lag luam yog paub tseeb, nws tseem nkag mus rau qhov kev pom zoo thiab them nqi theem. Tom qab, cov txheej txheem rau cov qauv thiab cov khoom lag luam sib dhos. Cov kauj ruam yog tsim qauv & kev sib dhos, tshuaj xyuas thiab kev sim, thiab ntim khoom & xa tawm hauv kev txiav txim.

Kev pab cuam tom qab muag

Tom qab cov khoom xa tawm, tom qab - cov kev pabcuam muag xws li kev teeb tsa, kev kawm, thiab kev txhawb zog, thiab kev txhawb zog, thiab kev txhawb nqa, thiab kev txhawb zog, thiab kev txhawb nqa, thiab kev txhawb zog, thiab kev txhawb nqa, thiab kev txhawb zog, thiab kev sab laj yog muab. Cov kev pabcuam no tau ceevfully tau ua kom peb cov kws tshaj lij kev lag luam lav kev ua haujlwm ntawm cov khoom siv.

Cov Khoom Xa

Kev txiav txim kev pom zoo thiab customized ntim

Tom qab kev lees paub tseeb, peb yuav tsim cov kev daws teeb meem ntim tshwj xeeb kom raug rau qhov tshwj xeeb, qhov hnyav ntawm koj cov cuab yeej.
Peb siv shockproof thiab dej noo-ntawv pov thawj cov ntaub ntawv rau kev tiv thaiv ntau txheej rau kev tiv thaiv cov khoom siv thaum lub sijhawm thauj mus los ntev.
Txhua lub thawv ntim khoom muaj xws li Qij Cim Qaws, xws li cov qauv khoom siv, cov lus qhia ua kom pom tseeb, thiab tuav ceev faj.

Export Kev lis kev cai tshem tawm thiab cov ntaub ntawv

Peb pab neeg, muaj kev paub ntau hauv kev lag luam thoob ntiaj teb, ua haujlwm rau txhua daim ntawv tshaj tawm, daim ntawv pov thawj ntawm cov hauv paus chiv keeb (CO), tshuaj xyuas tshuaj xyuas, thiab lwm yam.
Peb xyuas kom txhua cov ntaub ntawv ua tsis tiav nrog cov kev cai ntshuam ntawm lub teb chaws uas yuav zam kom tsis txhob qeeb ntawm cov ntaub ntawv teeb meem.

Ntau Cov Kev Xaiv Kev Lag Luam

Peb muaj kev thauj mus los ntawm:

Hiav txwv cia: Zoo tagnrho rau cov khoom loj lossis cov khoom siv oversized, muab cov khoom siv tau zoo thiab ruaj khov.
Cua Tsav Tsheb: Tsim nyog rau kev xa tawm ceev, muab kev thauj nrawm nrawm thiab txhim khu kev qha.
Av thauj: Rau cov teb chaws nyob sib ze lossis thaj chaw, peb muab cov kev pabcuam txwv kom ntseeg tau tias muaj kev thauj mus los luv luv.

Kev npaj thauj thoob ntiaj teb

Peb koom tes nrog ntau lub chaw ua haujlwm logistly ua kom ntseeg tau tias kev tshaj lij thiab kev nyab xeeb thoob plaws lub sijhawm thauj mus los.
Peb muab cov kev pab sib tw tiag tiag, tso cai rau cov neeg siv khoom los saib xyuas cov xwm txheej ntawm lawv cov khoom online, suav nrog cov sijhawm thauj khoom / tawm thiab kwv yees lub sijhawm tuaj txog.

Cov chaw nres nkoj kev coj noj coj ua thiab xa khoom

Peb pab cov txheej txheem kev lis kev cai tshem tawm ntawm cov chaw nres nkoj uas peb yuav tsum tau nkag mus rau hauv kev ua lag luam hauv zos.
Raws li cov neeg siv khoom xav tau, peb tuaj yeem muab "Qhov Rooj-Qhov Rooj" kev pabcuam xa tuaj, ncaj qha thauj cov khoom siv rau koj lub Hoobkas lossis cov chaw tsim qauv.

Peb cov kev xaiv tswv yim zoo

Cov kws tshaj lij: Muaj cov kws tshaj lij kev paub txog cov kws tshaj lij thev naus laus zis thiab cov kev cai xa tawm thiab cov txheej txheem ua haujlwm thoob ntiaj teb.
Ntiaj Teb Network: Cov koom tes muaj zog nrog cov chaw ua haujlwm log thoob ntiaj teb, npog cov haiv neeg muaj thiab thaj chaw.
Qhov Kev Pab Cuam Pob tshab: Tag nrho pob tshab los ntawm kev xa khoom xa mus rau tus me nyuam, ua kom cov neeg siv khoom kom hloov kho tshiab ntawm txhua lub sijhawm.
Customized kev daws teeb meem: Hloov pauv thiab cov kev xaiv daws teeb meem tsim raws li cov kev xav tau ntawm peb cov neeg siv khoom.

Pab

Tus kws

Kev pab

Dawb vog

Cov kev daws teeb meem

Nqi-Zoo

Tom qab muag

Cim npe nrov: 3000W HARNENING TSHUAB, CHIE 3000W HARDENTENING TSHUAB Manufacturers, lwm tus neeg, Hoobkas