Standard vs. High-Density: Sib piv lub rhaub rau cov khoom pwm

Cov neeg hauv kev lag luam tseem xav tias muaj hwj chim ntau dua txhais tau tias kev ua tau zoo dua. Thaum lub pwm tsis kub sai txaus, tej zaum koj yuav xav tau ntau dua -wattage 380V cartridge rhaub rau hauv lub qhov. Qhov no yuav kho qhov teeb meem ceev ib ntus, tab sis nws feem ntau tsim teeb meem tshiab: lub tshuab cua sov tuag sai dhau los yog, txawm tias phem dua, ua rau pwm nws tus kheej. Qhov tseem ceeb yog kom paub qhov sib txawv tseem ceeb ntawm qis- qhov ceev thiab siab - ntom ntom cartridge tso cua sov tsim thiab kom paub tseeb tias lub tso cua sov lub tso zis sib phim cov yam ntxwv thermal ntawm cov khoom pwm raws nraim.

Lub tshuab hluav taws xob zoo li qub yog tsim rau kev siv dav hauv cov xwm txheej uas qhov kub tuaj yeem ncav cuag 300 degree. Nws feem ntau muaj cov tub ntxhais ceramic nrog cov hlau tsis kam qhwv ib ncig ntawm nws. Cov hlau yog insulated nrog magnesium oxide hmoov thiab them nrog stainless hlau sheath. Hom kev tsim no yog pheej yig thiab ua haujlwm zoo rau feem ntau cov hlau los yog txhuas pwm uas khiav qis qis. Engineers use high-density cartridge heaters when there isn't much room inside the mould and the heat needs are very high, like in thin-section hot runners or high-speed injection moulding. Cov no yog tsim los ntawm swaging los yog dov lub rwb thaiv tsev sab hauv kom siab heev, uas cia lawv lis loj watt loads nyob rau hauv tib lub cev txoj kab uas hla. Qhov kawg tshwm sim yog lub tshuab cua sov uas tuaj yeem muab cov cua sov ntau hauv qhov chaw me me yam tsis tau poob nws cov qauv kev ncaj ncees.


Qhov ntsuas ntawm 5 txog 7 W / cm²

Rau feem ntau cov pwm siv cua sov, tshwj xeeb tshaj yog cov uas siv txhuas lossis cov cuab yeej siv ib txwm siv- steel pwm, ua haujlwm hauv 5-7 W / cm² yog qhov zoo tshaj plaws kom muaj cua sov sai- nce, txawm tias qhov kub thiab txias, thiab lub neej ua haujlwm ntev. Qhov "qhov chaw qab zib" rau watt ntom ntom cia cov cua sov los ntawm cov hlau tsis kam nkag mus rau hauv cov khoom pwm sai txaus kom cov coil sab hauv tsis kub dhau (feem ntau ntawm 800 thiab 900℃). Nws yooj yim los ua lej:
Txhawm rau nrhiav qhov watt ntom (W / cm²), faib tag nrho wattage los ntawm (π × lub taub rhaub dej × rhuab ntev).

Qhov kub ntawm lub plhaub tsuas yog nyob ntawm 50-80℃siab tshaj qhov pwm kub thaum koj khaws nws ntawm 5 thiab 7 W / cm². Qhov no txo ​​cov thermal load ntawm rwb thaiv tsev thiab sheath. Hauv kev xyaum, qhov no txhais tau hais tias cov cua sov uas siv txhua lub sij hawm ua rau 18 mus rau 36 lub hlis es tsis txhob tawg tom qab ob peb lub hlis.

Lub tshuab rhaub cartridge tau suav tias yog "siab-density" thaum nws qhov ceev yog ntau tshaj 10-15 W / cm². Cov chav no yog qhov zoo rau cov haujlwm tshwj xeeb xws li kub stamping tuag, nozzle cua sov, lossis nyias- phab ntsa extrusion tuag thaum qhov chaw nruj thiab xav tau ntau lub zog hauv qhov me me. Lawv xav tau siab-cov ntaub ntawv zoo xws li Incoloy 800 lossis 304L stainless hlau, kev tsim kho swaged, thiab nruj heev haum kam rau ua (0.02-0.05 hli clearance). Yog tias lub dab dej kub tsis raug, qhov kub ntawm cov hlau sab hauv tuaj yeem nce siab tshaj 1,000 degree, uas ua rau cov hluav taws xob magnesium oxide sai sai thiab ua rau lub cuab yeej hlawv tawm thaum ntxov.

Cov nyhuv ntawm "Soft Spot"

Raws li kev paub dhau los ntawm ntau txhiab qhov kev teeb tsa, tso lub siab - qhov ceev 380V cartridge rhaub rau hauv cov pwm txhuas uas tsis muaj cua sov txaus yog ib qho tshuaj rau kev puas tsuaj. Piv nrog rau lub rhaub dej kub stainless- steel sheath (≈17 × 10⁻⁶ / degree), txhuas muaj coefficient siab thermal expansion (ze li 23 × 10⁻⁶ /℃). Yog tias lub tshuab cua sov haum nruj heev thaum chav tsev nyob hauv chav tsev kub, thermal expansion yuav ua rau cov pwm tuav ib ncig ntawm daim cartridge, crushing lub sheath thiab shorting lub caij. Ntawm qhov tod tes, yog tias lub qhov loj me me, qhov siab watt ceev tsis tuaj yeem mus qhov twg. Lub tshuab cua sov tau kub dhau, uas ua rau "qhov muag muag" qhov twg lub plhaub kub tuaj yeem nce siab tshaj 700 degree, txawm hais tias pwm kub tsis tshua nyeem 200℃ntawm sab nraud sensors.

Qhov sib txawv loj ntawm qhov kub thiab txias no ua rau lub plhaub nthuav dav sib txawv, uas tuaj yeem ua rau pob, tawg, lossis tawg. Thaum lub plhaub tawg lawm, cov hmoov magnesium oxide raug rau saum huab cua, thiab cov dej noo rushes rau hauv. Cov insulating kuj poob sib nrug hauv ob peb teev xwb. Txoj kev lag luam txheej txheem los kho qhov no yog ua kom lub qhov uas yog remed los yog honed nrog clearance ntawm 0.05-0.1 hli ntawm kev ua hauj lwm kub. High-kub thermal paste feem ntau yog siv los sau cov pa me me thiab xyuas kom meej tias ob qhov chaw nyob ze.

Yog li, thaum xaiv qhov zoo tshaj plaws 380V cartridge rhaub, nws tsis yog hais txog qhov voltage, ntev, lossis tag nrho wattage; nws kuj tseem hais txog kev ua kom cov thermal tso tawm sib npaug ntawm cov khoom pwm cov thermal conductivity thiab expansion zog. Aluminium pwm (thermal conductivity ≈ 237 W / m·K) tuaj yeem ua haujlwm ntau dua watt ntom dua li cov pwm hlau (≈ 50 W / m·K) vim tias lawv tawg tau zoo dua. Txawm li cas los xij, lawv kuj yuav tsum tau ua tib zoo siv ntau dua. Rau PEEK lossis siab -kub engineering resins, siab - cov chav nyob nrog Incoloy sheaths thiab ua tau - hauv cov thermocouples yog qhov tseem ceeb heev. Tus nqi zoo tshaj -kev ua tau zoo piv rau cov cuab yeej PP lossis ABS yog nruab nrab ntawm 5 thiab 7 W / cm², thiab lawv yog ua los ntawm stainless hlau.

Ua ntej txiav txim siab zaum kawg ntawm lub tshuab rhaub yuav yuav, cov kws tsim khoom siv tau qhov kawg -cov ntsiab lus thermal simulation kom pom qhov chaw kub thiab ua kom qhov chaw zoo. Txhawm rau kom tau txais kev ua tau zoo tshaj plaws thiab lub neej ntev tshaj plaws ntawm lawv cov nroj tsuag, ntau tam sim no siv dual - teeb tsa qhov ceev. Qhov no txhais tau hais tias lub hauv paus pwm tseem ceeb muaj wattage tsis tu ncua thiab cov rooj vag lossis qhov chaw nozzle muaj siab - ceev nkaus xwb.

Cov neeg ua haujlwm tau txais kev faib hluav taws xob zoo ib yam, xav tau ntau dua rau kev hloov pauv, kev siv hluav taws xob qis dua, thiab tsawg dua qhov chaw khib nyiab los ntawm kev tshem tawm "ntau lub zog zoo dua" mus kom ze thiab ua tib zoo kho lub tshuab cua sov kom zoo rau cov khoom pwm. Qhov kawg tshwm sim yog cov txheej txheem uas txhim khu kev qha, ua kom cov kab tsim khoom ua haujlwm zoo, thiab ua kom tau nyiaj ntau dua. In today's competitive production world, taking a few extra minutes to figure out the right watt density and check fit tolerances pays off in years of reliable service.