Polyoxymethylene (POM), siab -kev ua tau zoo engineering yas, yog dav siv nyob rau hauv precision machinery, automotive qhov chaw, thiab hluav taws xob Cheebtsam vim nws zoo heev mechanical zog, tsis tshua muaj kev sib txhuam coefficient, thiab seem stability. Txawm li cas los xij, cov khoom siv cov khoom ua rau muaj teeb meem loj hauv CNC machining ntawm POM. Kab lus no tau txheeb xyuas cov teeb meem raug ntsib hauv CNC machining ntawm POM thiab nthuav tawm cov kev daws teeb meem uas ua raws li cov qauv thoob ntiaj teb, muab kev siv rau cov kws tshaj lij kev lag luam.
Polyoxymethylene (POM), tseem hu ua aldehyde polymer, polyoxymethylene, thiab polyacetaldehyde, yog cov thermoplastic engineering. Nrog rau qhov ceev ntawm 1.410 thiab 1.420 g / cm³, POM tsis tsuas yog nthuav tawm cov hardness zoo, lub zog, thiab rigidity, tab sis kuj boasts tshuaj tiv thaiv, qhov ntev stability, txhua yam muaj zog, thiab tsis tshua muaj coefficient ntawm kev sib txhuam, ua rau nws ib tug txhim khu kev qha khoom nyob rau hauv engineering daim ntaub ntawv. Nws cov khoom tsis muaj kev sib txhuam ua rau POM yog cov khoom siv zoo tshaj plaws rau kev sib hloov lossis zawv zawg cov khoom xws li bushings (SaibCNC tig POM bushingcov ntaub ntawv kawm), bearings, thiab gears.
Cov khoom ntawm POM Plastics
Kev sib txhuam qis thiab hnav tsis kam: POM plastics muaj qhov sib txhuam qis, uas ua rau nws tus kheej zoo heev -lubricating zog. Qhov kev txo qis kev sib txhuam no ua rau zawv zawg lossis tig cov lus tsa suab ntawm cov kua dej, ua rau cov khoom tsim tau zoo dua qub vim muaj kev sib txhuam qis thiab kev ua haujlwm siab.
Tshuaj Tiv Thaiv: POM yog qhov zoo - haum rau cov khoom uas tuaj rau hauv ntev - kev sib cuag nrog cov kuab tshuaj tshuaj, xws li cov twj tso kua mis, cov ntsaws ruaj ruaj, thiab cov khoom siv roj. Qhov no feem ntau yog vim POM qhov kev tiv thaiv zoo rau ntau yam tshuaj, cov kuab tshuaj, thiab roj. Nws tiv taus kev sib cuag nrog ntau yam tshuaj lom neeg, cawv, roj, thiab roj yam tsis muaj kev puas tsuaj loj. Tsis tshua muaj dej nqus thiab Dimensional Stability: POM yas nthuav tawm qhov zoo ntawm qhov ruaj khov, tswj nws qhov loj thiab cov duab txawm nyob rau hauv cov xwm txheej ntawm cov av noo thiab kub hloov pauv. Vim nws qhov nqus dej tsawg heev, POM tsis tshua muaj kev cuam tshuam rau qhov hloov pauv xws li o thiab deformation los ntawm noo noo. Cov ntawv thov uas yuav tsum tau ua kom nruj nruj thiab ua haujlwm zoo ib yam kuj vam khom rau POM qhov ruaj khov.
Kev ua tau zoo: POM yas nthuav tawm cov txheej txheem ua tau zoo, ua kom cov txheej txheem raug thiab ua tau zoo. Nws yog ib qho yooj yim rau pwm, tshuab, tig, thiab laum, ua kom yooj yim los tsim cov khoom siv thiab cov qauv tsim. Vim li no, POM resin feem ntau xaiv rau cov ntawv thov uas xav tau cov geometry nyuaj thiab siab precision.
Zoo heev Creep / Impact Resistance: POM yas exhibits zoo heev creep kuj, txhais tau tias nws muaj peev xwm tiv taus txhua yam kev ntxhov siab yam tsis muaj deforming. Cov cuab yeej no tso cai rau POM cov khoom siv txuas ntxiv ua haujlwm tau zoo txawm tias nyob rau hauv kev thauj mus los lossis kev nyuaj.
Cov teeb meem tseem ceeb ntawm CNC machining POM
Txawm hais tias POM muaj cov khoom siv zoo heev thiab hnav tsis kam, nws tseem ntsib qee qhov kev sib tw hauv kev ua haujlwm.
- Kev tawg. POM cov ntaub ntawv yog feem ntau ua rau tawg thaum lub sij hawm machining, tshwj xeeb tshaj yog thaum lub sij hawm siab - CNC machining ceev los yog sib sib zog nqus txiav. Qhov no yog tshwm sim los ntawm kev tso tawm ntawm kev ntxhov siab hauv cov khoom siv los yog tsis sib xws. Txhawm rau txo qhov tawg, qhov ua kom txias thiab ua haujlwm tsis zoo yog qhov tseem ceeb. Xyuas kom cov cua txias tsis sib xws thaum lub tshuab ua haujlwm thiab zam qhov kub hloov pauv sai. Kev siv cov kua txiav tsim nyog thiab kho cov kev txiav nrawm kuj tuaj yeem pab txo qhov kev pheej hmoo ntawm kev tawg.
- Cov teeb meem deformation. POM yas yog hygroscopic heev, yog li kev hloov pauv ntawm cov av thiab qhov kub thiab txias thaum ua haujlwm tuaj yeem ua rau deformation. POM cov ntaub ntawv nthuav dav thaum cua sov thiab tuaj yeem cog lus thaum txias, tshwj xeeb tshaj yog thaum ua cov khoom loj lossis cov khoom siv. Tsis tas li ntawd, kev txiav quab yuam ntau dhau thaum lub sijhawm ua POM tuaj yeem ua rau deformation, tshwj xeeb tshaj yog thaum ua cov txheej nyias nyias -walled lossis microstructures.
- Cov cuab yeej hnav. POM qhov tsis tshua muaj zog ua kom muaj cua sov me ntsis thaum lub sijhawm ua haujlwm, tab sis nws qhov ntom ntom tuaj yeem ua rau cov cuab yeej hnav sai. Xaiv cov khoom siv zoo thiab txheej txheej, nrog rau kev pom kev txiav, tuaj yeem ua rau lub neej ntev. Siv cov khoom siv zoo-carbide lossis coated zoo, ua ke nrog cov kev txiav tsis raug, tuaj yeem pab txo cov cuab yeej hnav thiab txhim kho machining zoo.
- Nto zoo. Nto zoo yog qhov kev sib tw loj hauv CNC machining ntawm POM yas. Vim yog cov khoom siv tus yam ntxwv, khawb, kos duab, thiab lwm yam tsis sib xws yuav tshwm sim ntawm qhov chaw. Yuav kom ua tiav qhov smoother nto, nws yog ib qho tsim nyog yuav tsum tau kho qhov txiav tsis, siv cov cuab yeej tsim nyog, thiab siv ntau yam txheej txheem machining, xws li kev ua tiav los yog tom qab- ua tiav, txhawm rau txhim kho qhov chaw tiav.
Ua rau thiab kev daws teeb meem rau deformation thaum POM CNC machining
Deformation yog ib qho kev sib tw thaum CNC machining POM (polyoxymethylene). Cov hauv qab no yog plaub lub ntsiab ua rau deformation thiab lawv cov kev daws teeb meem:
1. Txiav cua sov. POM muaj qhov tsis zoo thermal stability thiab yog cua sov-sensitive. Yog hais tias nws tsis txaus txias thaum lub sij hawm machining, nws yuav deform sai heev. Txhawm rau hais txog kev txiav cov cua sov, cov kev ntsuas hauv qab no tuaj yeem ua:
· Khaws lub cuab yeej ntse kom txo tau cov cua sov thaum lub sij hawm txiav;
· Txo tus nqi ntawm kev txiav ib kis thiab faib cov txheej txheem txiav rau ntau qhov kev hla;
· Ua kom tus nqi ntawm cov coolant siv.
Lub hom phiaj yog kom txo qis kev tsim hluav taws xob los yog tshem tawm cov cua sov sai sai thaum txiav kom tsis txhob thermal deformation.
2. Kev ntxhov siab sab hauv. Engineering plastics muaj cov coefficient siab ntawm thermal expansion. Thaum machining nrog cov nyiaj loj, tshem tawm cov kev ntxhov siab sab hauv tuaj yeem ua rau deformation. Txhawm rau daws qhov teeb meem no, cov kev ntsuas hauv qab no tuaj yeem ua:
· Xaiv thiab npaj cov khoom tsim nyog;
· Thaum tshem tawm cov khoom siv ntau, siv cov txheej txheem machining symmetrical los cuam tshuam kev ntxhov siab thiab deformation generated thaum lub sij hawm machining;
· Kho qhov nyiaj pub rau machining thiab sim ua kom muaj cov khoom siv tuab dua kom txo qis deformation thaum muaj kev ntxhov siab sab hauv raug tso tawm.
3. Clamping Deformation
Thaum lub sij hawm CNC machining, POM cov khoom yuav deform thaum clamping. Thaum lub clamp raug tso tawm, lub workpiece rov qab mus rau nws cov qauv qub. Txhawm rau zam qhov no, deformation tuaj yeem raug txo los ntawm kev ntxiv dag zog rau qhov chaw sib cuag ntawm lub workpiece thiab clamp. Cov txheej txheem tshwj xeeb suav nrog:
· Hloov txoj kev clamping. Piv txwv li, siv lub rooj ntev zaum vise nrog ib tug mos mos ncoo los yog ruaj nrog kua nplaum;
· Rau cov khoom loj dua, lub tshuab nqus tsev nqus tau siv tau, tab sis qhov chaw ua haujlwm yuav tsum tiaj tus;
· Tom qab tuav ib sab nrog cov kua nplaum thiab smoothing rau lwm yam, siv lub khob nqus dej kom ruaj ntseg ntawm qhov chaw ua haujlwm.
4. Elastic Deformation
POM cov khoom muaj qib siab ntawm elasticity. Thaum lub sij hawm machining, ib feem ntawm cov khoom nyob rau hauv kev sib cuag nrog lub cuab tam yuav khoov sab hauv thaum txiav. Tom qab lub cuab yeej raug tshem tawm, qhov machined feem yuav deform me ntsis. Txhawm rau txo qhov sib txawv ntawm qhov sib txawv los ntawm cov khoom siv elasticity, cov kev ntsuas hauv qab no tuaj yeem siv:
· Ua ntau yam cuab yeej them nyiaj kho raws li kev txiav;
· Kev txiav rov qab thaum machining cov khoom me me tuaj yeem pab txo qhov deformation los ntawm cov khoom elasticity.
Los ntawm kev hloov kho cov txheej txheem thev naus laus zis thiab qhov tsis zoo, qhov teeb meem deformation ntawm POM cov khoom hauv CNC ua haujlwm tuaj yeem tswj tau zoo los xyuas kom meej qhov ua tau zoo thiab raug.
Kev vam meej ntawm CNC machining POM yog nyob ntawm kev nkag siab tob ntawm cov khoom siv thiab kev tswj xyuas meej ntawm cov txheej txheem tsis. Los ntawm kev ua kom zoo dua cov cuab yeej, hloov txoj kev clamping, thiab kev sib koom ua ke thoob ntiaj teb cov qauv ntsuas, cov txiaj ntsig ntawm cov khoom tiav tuaj yeem txhim kho tau zoo.