Ua hauj lwm hauv paus ntsiab lus ntawm yas ultrasonic vuam tshuab
Lub tswv yim thiab kev faib tawm ntawm cov suab nrov
Nthwv dej yog tshwm sim los ntawm kev cuam tshuam pib ntawm ib qho chaw, thiab tau nthuav tawm los yog kis mus rau lwm cov ntsiab lus raws li kev txiav txim siab. Acoustic yoj yog kev nthuav tawm ntawm kev vibration zog nyob rau hauv nruab nrab elastic, ib yam ntawm elastic mechanical yoj. Hauv cov kua dej los yog cov khoom nruab nrab, thaum qhov loj ntawm qhov taw tes sib txawv ntawm nws txoj haujlwm sib npaug, nws yuav ua rau lub zog elastic rov qab los rau hauv nruab nrab. Qhov no elastic retoring quab yuam yog ua ke nrog lub inertia ntawm lub system, thiaj li hais tias qhov kev co ntawm nruab nrab loj taw tes yog tsis tu ncua kis mus rau lub loj cov ntsiab lus nyob ib sab, yog li tsim thiab Emit suab tsis. Acoustic nthwv dej yog ib qho elastic mechanical yoj. Qhov ntau zaus ntawm lub suab nthwv dej uas tib neeg lub pob ntseg tuaj yeem hnov yog feem ntau ntawm 20Hz thiab 20KHz, hu ua suab nrov. Lub suab tsis muaj zaus ntawm 2 × 104Hz-2 × 109Hz yog hu ua supersonic nthwv dej, thiab suab tsis muaj zaus qis dua 20Hz hu ua infrasonic tsis. (Infrasonic yoj). Cov suab tsis hnov tsw no muaj feem cuam tshuam rau tib neeg lub neej, thiab lawv kuj muaj ntau yam kev siv thiab kev cia siab rau kev loj hlob.
| Zaus / Hz | Nta | |
| Infrasound | 〈20 | Tib neeg pob ntseg hnov tsis tau, qhov kis tau tus mob attenuation tsawg heev, thiab kis tau tus mob nyob deb heev. |
| Suab nrov | 20-2×104Hz | Tau hnov los ntawm tib neeg pob ntseg |
| Ultrasound | 2×104Hz-2 × 109Hz | Kev nthuav tawm ntau zaus, kev nthuav tawm kev taw qhia muaj zog, qhov nruab nrab vibration muaj zog, thiab kev nthuav tawm hauv cov kua dej tuaj yeem ua rau cavitation. |
| Ultrasound | 2×109Hz-2 × 1012Hz | Kev nthuav tawm attenuation yog loj, lub wavelength yog luv, thiab cov zaus band roughly sib haum mus rau lub microwave. |
Ultrasound yog txawv ntawm cov suab tsis zoo tib yam hauv cov yam ntxwv hauv qab no: siab zaus, luv wavelength, loj zog, kev xav, refraction, resonance, thiab poob ntawm lub zog thaum lub sij hawm propagation txheej txheem.
Txoj cai thiab txheej txheem ntawm ultrasonic yas vuam
Ultrasonic yas vuam (ultrasonic welding) yog ib txoj kev tsis sib cuag welding. Lub hauv paus ntsiab lus ntawm ultrasonic vuam yog hloov 50/60 Hz tam sim no rau hauv 15, 20, 30 lossis 40 KHz siab zaus hluav taws xob los ntawm lub tshuab hluav taws xob ultrasonic, thiab hloov hluav taws xob hluav taws xob hloov mus rau hauv lub longitudinal mechanical vibration ntawm tib zaus los ntawm qhov lub zog hloov dua siab tshiab, thiab tom qab ntawd qhov kev hloov pauv no tau xa mus rau lub taub hau vuam los ntawm kev hloov kho qhov hloov pauv, thiab lub taub hau vuam hloov pauv lub zog vibration tau txais mus rau qhov sib koom ua ke ntawm cov vuam qub. Lub cheeb tsam nrog loj acoustic tsis kam ntawm lub interface siv kev sib txhuam los hloov kev vibration zog rau hauv tshav kub lub zog los ua kom muaj qhov kub thiab txias hauv zos. Lub tshav kub yog concentrated nyob rau hauv nruab nrab ntawm cov khoom siv vuam. Vim qhov tsis zoo thermal conductivity ntawm cov yas, nws tsis tuaj yeem dissipated nyob rau hauv lub sij hawm, ua rau cov yas hu rau saum npoo yuav yaj sai heev. Tom ntej no, ua kom cov chaw sib txuas sib txuas ua ke. Ultrasonic welding tuaj yeem siv rau hauv cov txheej txheem sib txuas ntawm cov khoom siv engineering feem ntau, dhau los ua ib qho ntawm cov kev pabcuam tseem ceeb ntawm cov txheej txheem kev sib txuas, thiab muaj ntau yam ntawm daim ntawv thov kev cia siab. Lub zog vuam tuaj yeem nyob ze rau lub zog ntawm cov khoom siv raw, thiab cov yam ntxwv ntawm cov khoom tsis cuam tshuam ncaj qha lossis hloov pauv. Txoj kev vuam muaj cov yam ntxwv ntawm kev tswj cov yas ntawm cov khoom, thiab tsis tshua muaj kev cuam tshuam rau elasticity thiab txhua yam muaj zog ntawm cov khoom sib txuas. Nws ua tau raws li cov kev cai ntawm engineering bonding. .
Daim duab 1 Daim duab kos duab ntawm kev ua haujlwm ntawm lub tshuab ultrasonic vuam
Ultrasonic vuam txheej txheem:
Lub tshuab hluav taws xob ua kom lub zog tswj cov teeb liab pneumatic kis tau tus mob, lub tog raj kheej pressurizes lub vuam lub taub hau kom poob thiab nias lub vuam kom ua rau lub tshuab hluav taws xob ultrasonic ua haujlwm, emit ultrasound thiab tswj lub sij hawm vuam, tshem tawm cov emission ultrasonic, txuas ntxiv mus ua haujlwm. qee qhov siab rau qee lub sijhawm, depressurize, thiab vuam taub hau tuaj tos, vuam dhau lawm.
Daim duab 2 Lub 4 theem ntawm cov txheej txheem ultrasonic vuam
Nyob rau hauv thawj theem, lub vuam taub hau yog nyob rau hauv kev sib cuag nrog ib feem, exerts siab thiab pib vibrate. Cov cua sov ntawm kev sib txhuam melts lub zog ua cov tav, thiab cov yaj ntws mus rau hauv qhov sib koom ua ke. Raws li qhov kev ncua deb ntawm ob qhov chaw txo qis, qhov vuam txav txav (qhov kev ncua deb ntawm ob qhov chaw vim qhov ntws ntawm yaj) pib nce. Thaum xub thawj, qhov vuam txav txav nrawm nrawm, thiab tom qab ntawd nws qeeb qeeb thaum lub zog melted conduction bar kis tau thiab kov qhov chaw ntawm qhov qis. Nyob rau hauv lub xeev kev sib txhuam theem, cua sov yog tshwm sim los ntawm kev sib txhuam zog ntawm ob qhov chaw thiab cov kev sib txhuam sab hauv ntawm qhov chaw. Kev sib txhuam cua sov ua rau cov khoom siv polymer kom sov mus txog nws qhov melting point. Tus nqi calorific nyob ntawm qhov zaus ntawm kev ua, amplitude thiab siab;
Qhov nce ntawm melting ceev nyob rau hauv lub thib ob theem ua rau ib qho kev nce nyob rau hauv lub vuam txav thiab kev sib cuag ntawm qhov chaw ntawm ob qhov chaw. Nyob rau theem no, ib txheej molten nyias yog tsim, thiab lub thickness ntawm molten txheej nce vim cua sov tas mus li. Thaum tshav kub kub nyob rau theem no yog tsim los ntawm viscous dissipation;
Nyob rau hauv lub thib peb theem, lub thickness ntawm cov tshuaj txheej nyob rau hauv lub weld tseem unchanged thiab nrog rau qhov kub thiab txias tis, khov kho lub xeev melting tshwm sim;
Nyob rau theem plaub, tom qab lub sijhawm teem tau dhau los lossis lub zog tshwj xeeb, theem hluav taws xob lossis kev ncua deb mus txog, cov khoom siv hluav taws xob raug txiav tawm, lub ultrasonic kev co nres, thiab theem plaub pib. Lub siab yog khaws cia, yog li ntawd ib feem ntawm cov yaj ntxiv yog nyem tawm ntawm qhov chaw sib txuas. Qhov siab tshaj plaws kev hloov pauv mus txog thaum lub vuam yog txias thiab khov kho, thiab qhov sib txawv ntawm qhov sib txawv tshwm sim.
Ultrasonic vuam tshuab yog dav siv nyob rau hauv ntau yam teb, thiab cov tshuab yog maj mature nyob rau hauv tas li ntawd mus xyaum. Nyob rau hauv tus txheej txheem ntawm ultrasonic yas welding, xaiv cov khoom qauv, kev xaiv ntawm solder thiab tus tsim ntawm vuam flux yuav cuam tshuam rau vuam zoo. Yog li ntawd, ua ntej yuav cov khoom siv ultrasonic yas vuam, cov kev tswj xyuas yuav tsum tau ua los txhim kho qhov zoo ntawm cov yas vuam.
