• Title/Summary/Keyword: Layered fabrication

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Development of a Novel Fabrication Process for Multi-layered Microstructures using a Micro Milling and Deep X-ray Lithography (마이크로 밀링과 X-선 리소그래피 공정을 이용한 다층 마이크로 구조물 제작 공정 개발)

  • Kim, Jong Hyun;Chang, Suk Sang;Lim, Geunbae
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.3
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    • pp.269-275
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    • 2014
  • Conventional machining technologies such as a milling process have limitations in accuracy to fabricate microstructures. Deep X-ray lithography using the synchrotron radiation is a promising micromachining process with an excellent accuracy, whereas there are difficulties in the fabrication of multi-layered structures. Therefore, it is mainly used for fabricating simple mono-layered microstructures with a high aspect ratio. In this study, a novel technology for fabricating multi-layered microstructures is proposed by combining two processes. In advance, an X-ray resist material is cut and machined into various shapes and heights by the micro milling process. Subsequent X-ray irradiation process facilitates the fabrication of multi-layered microstructures. The proposed technology can overcome the limitation of the pattern accuracy in conventional milling process and the difficulty of the multi-layered machining in x-ray process. The usefulness of the proposed technology is demonstrated in this study by applying the technique in the realization of various multi-layered microstructures.

Development of a Photopolymer-based Flexible Tactile Sensor using Layered Fabrication and Direct Writing (적층조형과 직접주사방식을 결합한 광경화성 수지 기반의 신축성 촉각센서의 제작)

  • Woo, Sang Gu;Lee, In Hwan;Kim, Ho-Chan;Lee, Kyung Chang;Cho, Hae-Yong
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.2
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    • pp.8-14
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    • 2014
  • Many kinds of robots and machines have been developed to replace human laborin industrial and medical fields, as well as domestic life. In these applications, the device sneed to obtain environmental data using diverse sensors. Among such sensors, the tactile sensor is important because of its ability to get information regarding surface texture and force through the use of mechanical contact. In this research, a simple tactile sensor was developed using the direct writing of pressure sensitive material and layered fabrication of photocurable material. The body of the sensor was fabricated using layered fabrication, and pressure sensitive materials were dispensed between the layers using direct writing. We examined the line fabrication characteristics of the pressure sensitive material according to nozzle dispensing conditions. A simple $4{\times}4$ array flexible tactile sensor was successfully fabricated using the proposed process.

Fabrication of Multi-layered Macroscopic Hydrogel Scaffold Composed of Multiple Components by Precise Control of UV Energy

  • Roh, Donghyeon;Choi, Woongsun;Kim, Junbeom;Yu, Hyun-Yong;Choi, Nakwon;Cho, Il-Joo
    • BioChip Journal
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    • v.12 no.4
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    • pp.280-286
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    • 2018
  • Hydrogel scaffolds composed of multiple components are promising platform in tissue engineering as a transplantation materials or artificial organs. Here, we present a new fabrication method for implementing multi-layered macroscopic hydrogel scaffold composed of multiple components by controlling height of hydrogel layer through precise control of ultraviolet (UV) energy density. Through the repetition of the photolithography process with energy control, we can form several layers of hydrogel with different height. We characterized UV energy-dependent profiles with single-layered PEGDA posts photocrosslinked by the modular methodology and examined the optical effect on the fabrication of multi-layered, macroscopic hydrogel structure. Finally, we successfully demonstrated the potential applicability of our approach by fabricating various macroscopic hydrogel constructs composed of multiple hydrogel layers.

A Study on Magnetization of Layered Metal Sulfide for the Removal of Cesium Ions from Aqueous Solution (수중 세슘 제거를 위한 층상 황화 금속 물질 자성화 연구)

  • Chul-Min Chon;Jiwon Park;Jungho Ryu;Jeong-Yun Jang;Dong-Wan Cho
    • Journal of Soil and Groundwater Environment
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    • v.28 no.4
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    • pp.1-5
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    • 2023
  • In the fabrication of magnetic adsorbent by incorporating iron species on base materials with layered structure, there can be a potential loss of adsorption capacity from the penetration of dissolved iron species into the structure. This work newly synthesized a magnetic adsorbent by incorporating nano magnetite and glucose into layered metal sulfide via hydrothermal treatment, and tested the removal efficiencies of cesium ions (Cs+) by the adsorbents fabricated under different conditions (final temperature and glucose mass ratio). As a result, the optimal fabrication condition was found to be mass ratio of 1 (layered metal sulfide): 0.1 (nano magnetite): 0.4 (glucose) and final temperature of 160℃. As-prepared adsorbent possessed good adsorption ability of Cs+ (54.8 mg/g) without a significant loss of adsorption capacity from attaching glucose and nano magnetite onto the surface.

Decomposition-based Process Planning far Layered Manufacturing of Functionally Gradient Materials (기능성 경사복합재의 적층조형을 위한 분해기반 공정계획)

  • Shin K.H.;Kim S.H.
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.3
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    • pp.223-233
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    • 2006
  • Layered manufacturing(LM) is emerging as a new technology that enables the fabrication of three dimensional heterogeneous objects such as Multi-materials and Functionally Gradient Materials (FGMs). Among various types of heterogeneous objects, more attention has recently paid on the fabrication of FGMs because of their potentials in engineering applications. The necessary steps for LM fabrication of FGMs include representation and process planning of material information inside an FGM. This paper introduces a new process planning algorithm that takes into account the processing of material information. The detailed tasks are discretization (i.e., decomposition-based approximation of volume fraction), orientation (build direction selection), and adaptive slicing of heterogeneous objects. In particular, this paper focuses on the discretization process that converts all of the material information inside an FGM into material features like geometric features. It is thus possible to choose an optimal build direction among various pre-selected ones by approximately estimating build time. This is because total build time depends on the complexity of features. This discretization process also allows adaptive slicing of heterogeneous objects to minimize surface finish and material composition error. In addition, tool path planning can be simplified into fill pattern generation. Specific examples are shown to illustrate the overall procedure.

Fabrication of Double-layered Porous Materials (이중 기공구조를 갖는 다공질체의 제조)

  • Yun, Jung-Yeul;Kim, Hai-Doo;Park, Chun-Hong
    • Journal of the Korean Ceramic Society
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    • v.39 no.10
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    • pp.919-927
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    • 2002
  • In order to fabricate double-layered porous materials powders of different particle sizes were pressed stepwise. Ford's equation which predicts the fired density with the change in pressed density was employed in order to adjust the difference in sintering shrinkage of the green body with double-layered porous structure. Double-layered porous materials were characterized by investigating microstructures and permeability. SEM micrographs showed the distinct difference in pore sizes of double-layered porous material. Permeability of single-layered porous material increased by increasing the starting particle sizes and porosity as well. Permeability of the double-layered porous material depends largely on the layer of small pore diameter.

Multi-layered Effect for the Insulation Design of a HTS Cable (고온초전도 케이블의 절연설계를 위한 적층효과)

  • Kwag, Dong-Soon;Cheon, Hyeon-Gweon;Kim, Hae-Jong;Cho, Jeon-Wook;Chung, Soon-Yong;Kim, Sang-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.10
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    • pp.950-955
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    • 2005
  • For the insulation design of a high temperature superconducting(HTS) cable, three kinds of design method were proposed, which used AC and impulse withstand voltage and partial discharge inception strength. However, the designed insulation thickness by AC and impulse could not be applied to cable fabrication process due to much low electrical breakdown strength. The effect of the multi-layered insulation paper was not considered on the previous insulation design and the insulation thickness by partial discharge inception strength could be applied only. In this paper, the electrical breakdown characteristic, which considered the effect of multi-layered of LPP, was investigated to design the insulation thickness.

Double layered Superconductor Wire using Electrophoresis (전기영동법을 이용한 2층 구조 초전도선재 제작)

  • Soh, Dea-Wha;Park, Jung-Cheol;Jeon, Yong-Woo;Li, Ying-Mei;Cho, Yong-Joon;Lim, Byung-Jae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.04a
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    • pp.21-24
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    • 2002
  • In this paper, for the study on the fabrication of YBCO superconductor wire, a double layered YBCO superconductor wire was fabricated by electrophoretic method on metal Ag wire(${\Psi}$0.8 mm). On the basis of previous researches for the fabrication of superconductor wire, the acetone suspension solution with 8 vol.% of 1% PEG(1000) was used and high molecular adhesive was experimentally performed for an improvement of the critical current density of superconductor wire. It was found that the Ag inter-layer deposited on the superconductor wire affect to the state of second YBCO film and its critical current density.

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Effect of Loading Path on the Hydroformability of a Three-layered Tube for Fabrication of a Hollow Part (중공품 성형시 삼중관의 액압성형성에 미치는 압력경로의 영향)

  • Han, S.W.;Kim, S.Y.;Joo, B.D.;Moon, Y.H.
    • Transactions of Materials Processing
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    • v.22 no.1
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    • pp.17-22
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    • 2013
  • Tube hydroforming is a technology that utilizes hydraulic pressure to form a tube into desired shapes inside die cavities. Due to its advantages, such as weight reduction, increased strength, improved quality, and reduced tooling cost, single-layered tube hydroforming is widely used in industry. However in some special applications, it is necessary to produce multi-layered tubular components which have corrosion resistance, thermal resistance, conductivity, and abrasion resistance. In this study, a hollow forming process to fabricate a part from multi-layered tubes for structural purposes is proposed. To accomplish a successful hydroforming process, an analytical model that predicts optimal load path for various parameters such as tube material properties, thickness of tubes, diameter of holes and the number of holes was developed. Tubular hydroforming experiments to fabricate a hollow part were performed and the optimal loading path developed by the analytical model was successfully verified. The results show that the proposed hydroforming process can effectively produce hollow parts with multi-layered tube without defects such as wrinkling or fracture.