2026-09-20T23:47:27Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/282012021-07-05T14:03:20Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Jung-Hoon Chun.
Shin, Jennifer Hyunjong, 1974-
Massachusetts Institute of Technology. Department of Mechanical Engineering
2005-09-26T19:05:56Z
2005-09-26T19:05:56Z
1998
1998
http://hdl.handle.net/1721.1/28201
42086301
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
Includes bibliographical references (leaf 29).
This work studied the feasibility of rapid prototyping using the Uniform Droplet
Spray (UDS) process. Straight and stable liquid metal jets are crucial requirements in the
application of UDS to rapid prototyping. Methods to maintain the jet straight and stable
were developed. Hardware improvements include an auxiliary orifice mounting fixture and
a new crucible bottom with a tightly-fitting orifice-pocket. A droplet trajectory controller,
including deflection plates and a pulse provider to a charging plate, was developed to
precisely deliver droplets for deposition. The degree of separation between deflected and
undetected streams of droplets was modeled and the prediction was compared with
experimental results. This comparison revealed that the degree of actual deflection was
approximately twice as high as the predicted value. Using the trajectory controller,
deposition was conducted using pure tin (Sn) with droplet impact conditions of velocity
and liquid fraction of 45 m/s and 97%, respectively. The deposition frequency was
varied in the experiment to study its effects on deposit shapes. A low frequency deposition
at 57Hz produced a vertical pillar, whereas a high frequency deposition at 574Hz resulted
in a large drop.
by Jennifer Hyunjong Shin.
S.B.
29 leaves
1507108 bytes
1507747 bytes
application/pdf
application/pdf
en_US
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering
Feasibility study of rapid prototyping using the uniform droplet spray process
Thesis
application/pdf
false
Publication
unknown
unknown
<Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="cfb5ffe3-2f7f-4e55-b018-48a5408705b3">
<Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type>
<Language>en_US</Language>
<Title>Feasibility study of rapid prototyping using the uniform droplet spray process</Title>
<PublishedIn>
<Publication>
</Publication>
</PublishedIn>
<PublicationDate>1998</PublicationDate>
<Authors>
<Author>
<DisplayName>Shin, Jennifer Hyunjong, 1974-</DisplayName>
<Affiliation>
<OrgUnit>
</OrgUnit>
</Affiliation>
</Author>
</Authors>
<Editors>
</Editors>
<Publishers>
<Publisher>
<DisplayName>Massachusetts Institute of Technology</DisplayName>
<OrgUnit />
</Publisher>
</Publishers>
<License>http://dspace.mit.edu/handle/1721.1/7582</License>
<Keyword>Mechanical Engineering</Keyword>
<Abstract>This work studied the feasibility of rapid prototyping using the Uniform Droplet
Spray (UDS) process. Straight and stable liquid metal jets are crucial requirements in the
application of UDS to rapid prototyping. Methods to maintain the jet straight and stable
were developed. Hardware improvements include an auxiliary orifice mounting fixture and
a new crucible bottom with a tightly-fitting orifice-pocket. A droplet trajectory controller,
including deflection plates and a pulse provider to a charging plate, was developed to
precisely deliver droplets for deposition. The degree of separation between deflected and
undetected streams of droplets was modeled and the prediction was compared with
experimental results. This comparison revealed that the degree of actual deflection was
approximately twice as high as the predicted value. Using the trajectory controller,
deposition was conducted using pure tin (Sn) with droplet impact conditions of velocity
and liquid fraction of 45 m/s and 97%, respectively. The deposition frequency was
varied in the experiment to study its effects on deposit shapes. A low frequency deposition
at 57Hz produced a vertical pillar, whereas a high frequency deposition at 574Hz resulted
in a large drop.</Abstract>
<Access xmlns="http://purl.org/coar/access_right"
>
</Access>
</Publication>