本帖最后由 扫街 于 2010-1-29 15:36 编辑
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* [7 Q5 B9 {( HFabrication(EBF3),电子束无模成形制造技术。是目前最为先进的直接制造技术(Direct Manufacturing),它可以从计算机3D模型直接成型出机械零件。与现有的快速成型技术(RP,rapid prototyping)不同的是,EBF3技术可以直接成型钛(titanium)、镍( nickel)、不锈钢(stainless steel)和其它有较高熔点的合金(refractory alloys)零件。EBF3将改变传统的金属加工制造模式,随着这一技术的进一步成熟,EBF3将首先应用于航空制造业、军工制造业和汽车制造业,大大缩短零件制造周期,减少原材料浪费,降低成本;并且有利于太空零件加工和空间设备维修。
: G- d0 W3 k- I% f# u D美国宇航局兰利研究中心(NASA Langley Research Center)日前对外演示了这项新技术。据了解,NASA已经获得了这项目技术的发明专利(#7,168,935),其它相关专利正在申请中,美国Sciaky Inc等公司为EBF3技术的合同商。
; ~* z4 v; Z# V0 S9 sEBF3,电子束无模成形系统见图dd9 r; r/ W" K' x5 r! r- Y$ I; M
EBF3制造出的样件见图ee
4 A$ E8 T5 H( ^; C& q- `3 BEBF3真空室见图ff
; ]0 i- d0 r6 `8 w$ L7 c* x+ Y2 VEBF3控制面板见图gg
2 q( r# |3 Z9 }2 p1 G$ A+ zEBF3 主要技术参数 5 B `7 ]) O4 L3 w# _
Current build volume:6 in. x 6 in. x 6 in. (15.24 cm x 15.24 cm x 15.24 0 e4 ?! o V |8 ?. n( a
cm)
, s1 g, a- K1 L* x$ K7 D" v Maximum build size: 6 in. x 6 in. x 6 in. (15.24 cm x 15.24 cm x 15.24 cm)
/ z8 @8 ? b7 t Layer thickness: 0.02 in. – 0.05 in. (0.5 mm – 1.27 mm)
' t ~" D8 G/ @ E-beam scan speed:Not applicable u- [1 r% Q4 c
Deposition rate:5 cubic in. per hour (80 cubic cm per hour)
g) g/ E: m0 v' F- @! X E-beam positioning accuracy:±0.005 in. (±0.127 mm)8 ?8 r& z$ S) _2 J3 w9 b
Part accuracy:±0.1 in. (±2.54 mm) has been demonstrated, and experience
$ F* x" D* V/ L4 ?. T! ~- e suggests that accuracy of ±0.05 in. (±1.27 mm) could eventually be & U4 e8 [2 t: S6 d" X
achieved
9 _ F( t- y2 ^2 A- J' V Calibration:Automatic& A: g+ s) e2 k- H- m0 h( }0 y( _1 D
Cooling:Automatic9 i, \2 e+ Z# j8 u
Power supply:Max: 30 kV, 100 mA, 3 kW
5 Q8 u7 n8 q1 V- Q3 [/ I# ^: \ Size:Standard 19-in. (48.26-cm) rack-mounted controls/ f: q$ x5 {$ W f7 y
Chamber option 1: 32 in. W x 42 in. H x 32 in. D
5 L; e+ g- ?9 q (107 cm W x 107 cm H x 81 cm D)1 P8 d6 f2 T$ ]
Chamber option 2: 24 in. diameter x 24 in. high
* S) ^5 q# Z4 ]& e% S (61 cm x 61 cm)
+ N I3 z: ?& n; Z) O Total system weight: 350 lbs. (160 kg)
# b6 Y: w" @6 Y4 \+ `8 } Process computer:PC, XP, LabVIEW Interface) ?( Z) G5 M% ^, [" J& ?" W
CAD interface:Standard: STL or other engineering CAD/CAM (ProE, CATIA, 0 a1 K: ]0 |9 Q6 W0 R$ B
FeatureCAM, MasterCAM)/ i5 \& d" C& }. M: w" f. h
Network:Ethernet: 10/100
# T# ^6 e8 r1 }+ s4 D; W Certification:NASA’s partners are seeking aerospace certification |