Cov cawv ntawm cov ntaub ntawv yas ntawm ultrasonic vuam
1. Ultrasonic vuam tawm hauv cov yas. Yas qhov chaw yuav ntau dua los yog tsawg dua nqus thiab attenuate lub zog ultrasonic, uas yuav muaj ib qho kev cuam tshuam rau cov ua ultrasonic. Plastics feem ntau muab faib ua cov ntaub ntawv amorphous. Raws li cov tawv tawv, muaj cov roj hmab tawv thiab mos roj hmab. Muaj kuj yog qhov txawv ntawm cov qauv. Nyob rau hauv layman' s cov lus, ultrasonic ua kev ua haujlwm ntawm cov yas nrog siab hardness thiab melting point yog qhov zoo dua li ntawm cov yas nrog tsawg hardness thiab siab melting point. Yog li no, qhov no suav qhov teeb meem ntawm qhov kev ncua deb ntawm kev ua ultrasonic.
2. Qhov cuam tshuam ntawm kev ua haujlwm ntawm cov khoom siv ntawm cov yas ntawm cov tshuab hlau ultrasonic
Cov ntu yas dhau los ua cov txheej txheem sib txawv xws li kev txhaj tshuaj molding, extrusion lossis tshuab moulding thiab kev ua cov txheej txheem sib txawv yuav tsim cov yam uas muaj feem cuam tshuam rau ultrasonic welding.
A: Cov kev tiv thaiv tsis zoo: Cov teeb meem ntawm cov av noo feem ntau tsim nyob rau hauv cov txheej txheem ntawm cov hlau nplaum los yog cov chaw seem ntawm lub hnab yas. Vaum qhov tsis xws luag ntxim nyiam lub zog siv thaum lub sijhawm vuam, ua rau dej pom ntawm lub chaw sib khi, thiab txuas ntxiv lub sijhawm thaum vuam. Yog li ntawd, cov khoom siv yas nrog cov av noo siab yuav tsum tau ua ua ntej welding. Kev kho kom qhuav. Xws li polyoxymethylene thiab hais txog.
B: Cov cawv ntawm cov txheej txheem txhaj tshuaj molding:
Qhov kev hloov kho ntawm kev txhaj tshuaj molding cov txheej txheem yuav ua rau muaj qhov tsis xws li hauv qab no:
①Txhais kev hloov pauv (shrinkage, khoov deformation)
ETxoj kev hloov pauv
UrSurface kev puas tsuaj
④ Cov khaub ncaws tsis zoo
C: Txee lub neej: Tom qab cov khoom siv yas ua tiav los ntawm kev txhaj tshuaj molding, lawv feem ntau tso rau tsawg kawg 24 teev ua ntej vuam kom tshem tawm cov kev ntxhov siab thiab deformation ntawm qhov chaw yas. Cov ntu yas ua los ntawm amorphous yas los ntawm kev txhaj tshuaj molding tsis tau raws li qhov ua kom tiav no.
D: Siv hnab yas
Lub zog ntawm cov yas siv dua tshiab yog qhov tsis zoo, thiab kev yoog raws mus rau lub tshuab nqus hlau ultrasonic kuj tsis zoo. Yog li ntawd, yog tias siv cov plastics siv, ntau qhov tsim qauv yuav tsum raug txiav txim siab raws li qhov tsim nyog.
E: Tso tus neeg sawv cev thiab impurities
Cov neeg tso tawm thiab impurities muaj qee yam ua haujlwm rau ultrasonic vuam. Txawm hais tias qhov hnyav thiab qhov tsis zoo ntawm cov txheej txheem nto tuaj yeem ua kom ploj mus thaum lub sij hawm ua ultrasonic, cov suab nrov uas yuav tsum muaj kev sib khi lossis qhov nquag ntawm lub siab ua haujlwm ultrasonic ua haujlwm siab dua li cov kev txwv siab ntawm tib neeg lub rooj sib hais (txog 20,000 Hz) yog hu ua ultrasonic vuam , lossis hu ua Ultrasound. Cov kev cai tshaj tawm ntawm ultrasonic kev xav, rov qab ua dua, qhov sib txawv, thiab tawg ntawm qhov nruab nrab tsis yog qhov tseem ceeb ntawm kev cai ntawm lub suab nrov. Tab sis tus nthwv dej ntawm ultrasound yog luv heev, tsuas yog ob peb centimeters, txawm tias ob peb txhiab ntawm ib millimeter. Piv nrog suab nrov ntawm lub suab, ultrasonic tsis muaj ntau cov yam ntxwv txawv: kev tshaj tawm ntawm qhov sib txawv-lub nthwv dej ntawm ultrasonic vuag yog luv heev, thiab qhov loj ntawm cov teeb meem zoo ib yam yog ntau zaus ntau dua li lub wavelength ntawm ultrasonic vuag. Yog li ntawd, qhov tsis zoo lub zog ntawm ultrasonic vuag tsis zoo heev. Nws yog nyob hauv qhov nruab nrab homogeneous. Nws tuaj yeem nthuav tawm hauv qhov kev taw qhia qhov ncaj, thiab qhov luv luv ntawm lub yoj ntawm ultrasonic yoj, qhov tshwj xeeb tshaj yog cov yam ntxwv no. Cov yam ntxwv ua muaj zog ─ ─ Thaum lub suab tawm suab hauv huab cua, nws thawb cov khoom hauv cov huab cua kom rov qab ua kom nrov rov qab los ua haujlwm ntawm cov lus me me. Lub suab yoj lub zog yog qhov kev tawm dag zog ntawm lub cev uas hais tawm qhov ceev ntawm lub suab yoj ua haujlwm. Nyob rau ntawm tib lub zog, ntau dua qhov zaus ntawm lub suab yoj, ntau dua lub zog nws muaj. Vim muaj qhov loj ntawm ultrasonic tsis, lub zog ntawm ultrasonic tsis yog loj heev piv nrog cov suab nrov zoo ib yam. Cavitation ─ ─ Thaum cov ultrasonic tsis muaj pa tawm hauv cov kua, cov kab noj hniav me me yuav tsim hauv cov kua vim muaj kev kub ntxhov ntawm kev co ntawm cov khoom ua kua. Cov kab noj hniav me me no nthuav dav thiab kaw nrawm nrawm, ua rau muaj kev sib tsoo ntawm cov khoom ua kua, uas ua rau muaj kev ntxhov siab ntawm ntau txhiab mus txog kaum txhiab ntawm cov huab cua. Qhov kev sib txuam hnyav ntawm cov lus hais yuav ua rau qhov kub ntawm cov kua kom dej dheev thiab ua kom muaj kev nplij siab zoo, yog li ob lub dej tsis sib xws (xws li dej thiab roj) emulsify, thiab ua kom lub zog ntawm kev daws teeb meem. tshuaj lom neeg cov tshuaj tiv thaiv. Cov teebmeem ntau yam tshwm sim los ntawm qhov kev nqis tes ntawm ultrasonic vuam hauv cov kua yog hu ua ultrasonic cavitation.
