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Direct Forming of 3-D Sandwich Parts by Fused Deposition Method Using Double Nozzle

使用双喷嘴熔融沉积法直接成型 3D 夹层零件

基本信息

批准号：
13650803
负责人：
KAGAWA Akio
金额：
$ 2.69万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

By applying a characteristic solidification sequence of melting and solidification in the Fused Spinning Deposition method and the difference in melting point of materials, direct forming of sandwich parts consisting of different metallic materials is expected to be available without bonding heat-treatment. In the present work, as an application of the FSD method, the conditions for direct forming of duplex tube castings consisting of inner and outer metallic materials were examined using a double nozzle type FSD apparatus. Al-4mass%Cu alloy and Cu-20mass%Sn alloy were used as outer and inner materials of duplex tube castings. After piling up the Al-Cu alloy melt to form the outer tube, the Cu-Sn alloy melt was deposited inside the Al-Cu alloy tube in contact with the side surface of the outer tube. Changing the time interval t between the start of deposition of outer and inner tubes, the microstructures on the vertical section were observed using OM, SEM and TEM. For smaller Δt, melting-down of the outer tube with low melting point occurred and, for greater Δt, insufficient interface bonding between the outer and inner tubes was observed. In the case of an adequate time interval, Δt=196s, complete interface bonding and duplex tube shaping were achieved, where two interfaces were observed on the outer and inner tube sides. The microstructures near the interfaces consisted of complex phases appeared in the Al-Cu-Sn ternary phase diagram. It was demonstrated from the results obtained that direct forming is possible by setting a suitable time interval between the start of deposition of outer and inner tubes without bonding heat-treatment by the FSD method using double nozzles.

利用熔融旋压沉积法熔融凝固的特点和材料熔点的差异，可以实现不同金属材料组成的夹层零件的直接成形，而不需要进行粘结热处理。作为FSD方法的一种应用，本文利用双喷嘴FSD装置研究了由内外金属材料组成的双层管铸件的直接成形条件。双管铸件的内外材质分别为Al-4质%铜合金和铜-20质%锡合金。在铝铜合金熔体堆积形成外管后，铜锡合金熔体沉积在与外管侧面接触的铝铜合金管内。改变外管和内管开始沉积的时间间隔t，用光学显微镜、扫描电子显微镜和透射电子显微镜观察了垂直截面上的显微组织。对于较小的Δt，低熔点的外管发生熔化，而对于较大的Δt，则观察到内外管之间的界面结合不足。在适当的时间间隔，Δt=196s的情况下，实现了完全的界面结合和双管成形，其中在管子的内外侧观察到两个界面。Al-Cu-Sn三元相图中，界面附近的显微组织由复杂的相组成。结果表明，在外管和内管开始沉积之间设置适当的时间间隔，而无需采用双喷嘴的FSD方法进行粘结热处理，直接成形是可能的。