【提出用】

Additive Manufacturing, ３D PrintingDe304

N INIINOI N O LAB.
LAB.
New Function
ThroughNewManufacturing
Technology※研究室名のみ
入力くださいDesign-Led X Platform
Department of Mecanical and Biofunctional Systems
Additive Manufacturing Science
Department of Precision Engineering, Graduate School of Engineering

http://lams.iis.u-tokyo.ac.jp

Laboratory for additive manufacturing science, LAMS, performs studies on process and application technologies of additivemanufacturing (3D printing), aiming at the creation of new mechatronic devices and systems through development of manufacturing
technologies of fully 3-Dimensional and multi-material structures.

Research subjects
IR Laser
Scanner

Additive manufacturing and laser sintering

Thermoplastic

Additive manufacturing is a process of joining materials to make parts or objects from 3D model data, usually layer
upon layer, as opposed to subtractive manufacturing methodologies. Laser sintering is one of the additive
manufacturing processes, which mainly involves spreading a thin layer of thermoplastic resin powder and repeatedly
heating it with an infrared laser to selectively melt and solidify it to materialise the desired shape.

Laser SinteringScrew

Research on Process Development• Process for high performance plastics
Most of the high-performance plastics possess a high melting point, and it raises therequirement for heat resistance of processing machines leading to high machine cost as
for conventional process. Removing this drawback, low temperature process facilitates
provision of high-performance parts through laser sintering at a lower cost.
• Multi-material AM process
Few AM methods that can process multiple materials with very different melting points,
such as resin and metal, in a single batch have been reported. An AM method of metalresin composite structures is being researched by combining LDS (Laser DirectStructuring), one of the manufacturing technologies for MIDs (Molded InterconnectDevices) with laser sintering technology.

PartAnchor
Backup plate

Temp. range forlow temperature process
Melting point
Temperature

Recrystalization temp.

Parts out of PEEK
1．Forming

2. Activation

4. Plating

Process of Multi-material AM

Copper foil

Copper Foil Structuring in Internal Hollow

Parts having cirucuit• Fabrication of optic devices（Collaboration with Edagawa Lab. at Div. 1）
In order to verify the theory proposed by Edagawa et al. (Div. 1, IIS) that high dielectric structures with anamorphous diamond structure have a band gap, amorphous diamond structures were actually produced bylaser sintering a material containing titanium dioxide with high efficiency and the band gap was observed.

Optical device having diamond amorphous structure
Labor time of technician

Socket of PEEK

3. Forming• Additive manufacturing of tissue engineering scaffolds（Collaboration with Sakai Lab. at FoE)
Additive manufacturing has been utilized in various organ reconstruction methods in tissue engineering(regenerative medicine). Laser sintering of tissue engineering scaffolds made of biodegradable resin and cell
culture using these scaffolds are being investigated for reconstruction of organs relatively large in scale andmetabolic rates.

Tissue Engineering Scaffolds

SkilledMid-skilled

beginner

Conventional

4h05m

5h15m

7h15m

CAD

1h12m

1h30m

1h36m

71%

71%

78%

Reduction

Temp. range forconventional process

Temperature Range of Low Temperature Process

Cutting line

Research on Application Development

Base plate

Low Temperature Laser Sintering
Heat Flow• Low Temperature Laser Sintering
Although powder bed preheating to near melting point effectively prevents warpage ofworkpieces during process, this method includes problems such as limitation of
applicable material species and difficulty in reusing the powder leading to high materialcosts. ‘Low-temperature laser sintering', where the preheating temperature can be freely
selected eliminates these problems.

• Sport prosthesis through AM (A national project, “New manufacturing through Additive Manufacturing”).
Proper utilization of AM requires comprehensive development of a business model, product selection, designand CAD tools suitable for AM. Using a sport prosthetic socket as an example, this project developed atrinity of processing technology for high-performance resin, functional and aesthetic design, and design tools
for custom-made products in order to manufacture lightweight and high-strength prosthetic legs.