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本帖最后由 掃街 于 2010-1-29 15:36 編輯 0 k( C: a; O2 H" Y1 k
( D& q" r# {' R( nFabrication(EBF3),電子束無模成形制造技術。是目前最為先進的直接制造技術(Direct Manufacturing),它可以從計算機3D模型直接成型出機械零件。與現有的快速成型技術(RP,rapid prototyping)不同的是,EBF3技術可以直接成型鈦(titanium)、鎳( nickel)、不銹鋼(stainless steel)和其它有較高熔點的合金(refractory alloys)零件。EBF3將改變傳統的金屬加工制造模式,隨著這一技術的進一步成熟,EBF3將首先應用于航空制造業、軍工制造業和汽車制造業,大大縮短零件制造周期,減少原材料浪費,降低成本;并且有利于太空零件加工和空間設備維修。 # J: Y8 A, k5 f0 J
美國宇航局蘭利研究中心(NASA Langley Research Center)日前對外演示了這項新技術。據了解,NASA已經獲得了這項目技術的發明專利(#7,168,935),其它相關專利正在申請中,美國Sciaky Inc等公司為EBF3技術的合同商。( U A" ^; j3 @: A" A& ^
EBF3,電子束無模成形系統見圖dd, ~: ]6 G/ a+ D" {. P
EBF3制造出的樣件見圖ee+ n4 Q: n' c7 l6 `! ^5 \
EBF3真空室見圖ff
/ G5 x+ r }$ v. m& P3 FEBF3控制面板見圖gg
$ s4 s) m+ S$ H% o, @EBF3 主要技術參數
2 f0 s, F) F. `5 h% v1 d Current build volume:6 in. x 6 in. x 6 in. (15.24 cm x 15.24 cm x 15.24 . l0 k3 X% u; `9 Q5 }" C) N3 z
cm)
6 J7 p" {1 P0 ~. A3 b9 n' ? Maximum build size: 6 in. x 6 in. x 6 in. (15.24 cm x 15.24 cm x 15.24 cm), f) q1 \" y% L0 A# n
Layer thickness: 0.02 in. – 0.05 in. (0.5 mm – 1.27 mm)" M9 x+ Q5 Z2 \4 q1 q- q/ h2 w
E-beam scan speed:Not applicable; o7 v- } J g+ ]! B# ~
Deposition rate:5 cubic in. per hour (80 cubic cm per hour)7 } E, l& y) M' k" c K
E-beam positioning accuracy:±0.005 in. (±0.127 mm)" a- z7 d: S V* Q
Part accuracy:±0.1 in. (±2.54 mm) has been demonstrated, and experience * q m& i& r( U: g2 i
suggests that accuracy of ±0.05 in. (±1.27 mm) could eventually be
/ r. J" V- G1 l# D$ s achieved
6 n! M! d$ Z$ b' A3 H/ t% I+ E Calibration:Automatic% h* t$ ?* ~0 f H& o
Cooling:Automatic7 K0 N1 L+ C5 W6 B
Power supply:Max: 30 kV, 100 mA, 3 kW, ~) o8 n8 y0 a s+ s5 E: Z" t
Size:Standard 19-in. (48.26-cm) rack-mounted controls
! @$ v& Q4 C" \$ P Chamber option 1: 32 in. W x 42 in. H x 32 in. D
$ }$ z1 u3 D5 ~; |# {! q. U% Z (107 cm W x 107 cm H x 81 cm D)2 W2 O+ k7 y. e' l) [- e& W
Chamber option 2: 24 in. diameter x 24 in. high
9 h/ t; ]! p( m$ Y a( f5 S. n6 Y* l (61 cm x 61 cm)8 _9 R# D/ ?$ }2 e) A% F
Total system weight: 350 lbs. (160 kg)
1 U$ ]3 W" C. N9 U7 e# d Process computer:PC, XP, LabVIEW Interface
/ _8 g5 F: J! ~ CAD interface:Standard: STL or other engineering CAD/CAM (ProE, CATIA, # z9 T6 M/ r/ G8 g# h
FeatureCAM, MasterCAM)
$ v+ S8 t8 K, t& o Network:Ethernet: 10/100
T* v2 b* Z) @; Z0 f) I. q3 y { Certification:NASA’s partners are seeking aerospace certification |
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