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1、ISSN 1000-0054CN 11-2223/Nbv(1S)J T singhua Univ ( Sci & Tech) ,2004M4482004, Vol. 44, No.827/371107-1110压电微滴喷射装置的设计魏大忠, 张人佶, 吴任东, 周浩颖(bv,;y,100084)l: 2003-09-10:SE1S( 50105008)Te:v( 1977-) ,3(q) ,pV3bE-mail: dzzhong99 mails. tsinghua. edu. cnY:f,q,E-mail: zhangrj mail. tsinghua. edu. cnK1: 基于微滴喷射的快
2、速制造技术是快速成形发展的重要方向之一,压电微滴喷射装置是其核心技术。该文建立了典型的压电微滴喷射装置模型,通过对腔体内部流体运动的简化,推导出形成微滴喷射的两个数学判据。在此基础上,提出了压电驱动器和腔体结构的设计方法,包括压电驱动器形式和材料的选择,压电驱动器变形量和工作频率的计算,研究了电源参数对喷射效果的影响。根据此方法设计的压电微滴喷射装置能实现黏度范围在0100 mPanulls内流体的可控离散喷射,喷射频率为 0. 41 kHz, 喷孔直径最小为0.08 mm。1oM: 工艺设计; 快速成形; 微滴; 喷射ms|: T H 162DSM: AcI|: 1000-0054(2004
3、) 08-1107-04Design of piezoelectricmicro-droplet injectorWEI Dazhong, ZHANG Renji, WURendong, ZHOUHaoying( Center of Laser RapidPrototyping,Department of Mechanical Engineering,Tsinghua University, Beijing 100084, China)Abstract: Rapid manufacturing technology based on micro-dropletjetting is one of
4、 the main directions of rapid prototyping ( RP)development. The piezoelectric micro-droplet injector is the pivotaltechnology. A piezoelectric micro-droplet injector model describingthe fluid movement in the cavity and the droplet formation was usedto define two criteria for micro-droplet formation.
5、 The criteria wereused to design the piezoelectric actuator and cavity structure,including the selection of the piezoelectric actuator form andmaterials, the calculation of the piezoelectric actuator distortion,and the working frequency. T he influence of power supplyparameters on the jetting was al
6、so described. T he new piezoelectricinjector provides controllable discrete jetting at frequencies from 0. 4to 1 kHz with a maximum fluid viscosity of 100 mPa nulls and aminimum orifice diameter of 0. 08 mm.Key words: process design; rapid prototyping (RP) ; micro-droplet;injectory/y( rapid prototyp
7、ing, RP)1?ZZ_B,731o/ 1b3/4?S,1pYyaTqaVea?iBq,H1p8l,FZLbzC3/1bzm1U,(LIr,(L t*HYU;4)z,88=3,A8,I)A=bm3dHYIAUimVnV,1Hq:1)1XAVfT; 2)8vBA8bVft= t*HYKv,NH88=p= 2null/a0,Ta0Ib,TI=C*T,AVI,112nullU2o(t* ) 2null/a0,T: nullA8, nullA8Vf, Uo(t)A8_bTVWe = nullU2o(t* )a0null 4, ( 1)Weu,VA88Vf1bT(1)Bb2HqVV eject =t*
8、0Uo(t) nulla20dt43 nulla30. ( 2)I88=8f,88=8KEsT 2 ,V88=6H,88=8l,I=8,V88I8MbT,VNH88=A8,iI=8Mb,88=p(t)I=8TbI=8PdpF( t) = nullnulla20L0dUo(t)dt , ( 3)TL0I,A8=p(t) = nullL0dUo(t)dt . ( 4)L!FV,88=A8,5Uo(t) = pnullL0t. ( 5)T(2)a( 3)a(5)VWe83 pa20nullL0. ( 6)2VWe88jaA8W1bT(2)a( 6)bAHHqb2压电微滴喷射装置的设计!9V11p,v
9、laSaTq,!9za88,TeM1,!99!9b1108bv(1S) 2004, 44(8)2. 1z!9(L41pMvbPZT(#)-M5K(L,PZT-5+Qm, Kpv, D33,Mv,90 kV/cm/V30. 6%MbH,ML1,?,PIrq3K,88=p = Kvnullhnullshc, (10): nullhz, nullsA88, hc88; K v= nullVnull4 D2nullh8, D88,mU88,zl/, K vB 6,V|0. 3bA,2,|T(10)2nullh = 38 WeKv L0a0 hcnulla0 nulls . (11)L=!9Ing 7,znullhY|92j5b9,In88=Y,T88=,nullhL=9+E,+)bL=!9,E88=3bzj/1:nullh = K pnull Dt . (12): K p, nullzbBH,VT( 9)a( 11)a(12)zjb2.388!988z,I11p,8
