本帖最后由 扫街 于 2010-1-29 15:36 编辑
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4 _! m% `8 E4 h7 p8 mFabrication(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。
" A& t) F2 ]$ u7 u9 b! r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。
2 x$ C" V& q+ K5 Z2 i/ l( _EBF3,电子束无模成形系统见图dd
+ a9 ?# z1 M0 o) d) MEBF3制造出的样件见图ee, J1 X0 K2 T" Z% b, k. z
EBF3真空室见图ff* {( L# U0 I$ i( }# E
EBF3控制面板见图gg O" m7 H3 s b- C6 {
EBF3 主要技术参数 2 K9 W* h: l+ i4 P& \
Current build volume:6 in. x 6 in. x 6 in. (15.24 cm x 15.24 cm x 15.24 + @5 G; r; S# B' b) X t( s6 ]- }3 o
cm)' B$ f! G& ]) F
Maximum build size: 6 in. x 6 in. x 6 in. (15.24 cm x 15.24 cm x 15.24 cm)
' M3 p$ T, z/ y1 k1 r Layer thickness: 0.02 in. – 0.05 in. (0.5 mm – 1.27 mm)0 Y6 a2 k4 H" {3 F7 J0 U6 }- B
E-beam scan speed:Not applicable
, P0 d! V6 R5 M" Z" t# G2 y Deposition rate:5 cubic in. per hour (80 cubic cm per hour)
; o+ t5 l4 i4 @. n" P. j E-beam positioning accuracy:±0.005 in. (±0.127 mm)/ ^1 Y5 u9 f- J5 v. k3 R: }' Y& T
Part accuracy:±0.1 in. (±2.54 mm) has been demonstrated, and experience
: f0 Z' z. X1 \2 m" T% q suggests that accuracy of ±0.05 in. (±1.27 mm) could eventually be
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Calibration:Automatic
) f8 M: O1 x4 O7 k) ` Cooling:Automatic
+ Z9 F& J9 Q" T4 j: r2 Z Power supply:Max: 30 kV, 100 mA, 3 kW/ N* M4 J x( G; y2 d
Size:Standard 19-in. (48.26-cm) rack-mounted controls
! ]- x8 N: p3 D' q0 t b0 k5 G Chamber option 1: 32 in. W x 42 in. H x 32 in. D
' p$ s( `- u" R& B% h) E' ?9 J (107 cm W x 107 cm H x 81 cm D)2 O v9 O: C% l* p% b. R
Chamber option 2: 24 in. diameter x 24 in. high4 V$ @, t' P* w0 C; ?; _% }, P/ v8 r2 s
(61 cm x 61 cm)' I2 W" t4 q& [! U* B7 C# ]1 x
Total system weight: 350 lbs. (160 kg)% m1 M. H/ r, [: }
Process computer:PC, XP, LabVIEW Interface
) H7 O8 x& O3 ] CAD interface:Standard: STL or other engineering CAD/CAM (ProE, CATIA, ; v X9 L; A- e6 F$ l7 x1 _
FeatureCAM, MasterCAM)
0 G9 h0 d* Y9 E* F; U! x+ A Network:Ethernet: 10/100
4 H, c4 b; m$ ~ q! e+ t$ c- ]0 b Certification:NASA’s partners are seeking aerospace certification |