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Posted on : Thursday 18th June 2020 09:44 AM

MHI Machine Tool to Showcase State-of-the-Art Metal 3D Additive Manufacturing Technology

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Mitsubishi Heavy Industries Machine Tool Co., Ltd., a group company of Mitsubishi Heavy Industries, Ltd. (MHI)(TOKYO:7011) based in Ritto, Shiga Prefecture, is set to begin overseas marketing of its 3D (three-dimensional) printer using its proprietary Directed Energy Deposition (DED) process.1 The aim is to enhance recognition and gain a foothold in the United States, which is driving the rapidly increasing global market for 3D printing. As a first step, MHI Machine Tool will attend RAPID + TCT 2019, a trade fair for sophisticated additive manufacturing technologies, held from May 20-23 in Detroit, in order to showcase its new technologies essential for the practical application of metal 3D printing, along with the monitoring feedback and local shielding functions. These latter two functions are the world's first practical applications of new technology.


This metal 3D printer was created by MHI Machine Tool based on the results from a technology development project2 performed by the Technology Research Association for Future Additive Manufacturing (TRAFAM), commissioned by the New Energy and Industrial Technology Development Organization (NEDO). The entry model "LAMDA 200," certain for the manufacture of small prototype components, was introduced in March 2019. In the proprietary DED process, powder is regularly injected from a nozzle, then melted and solidified by laser irradiation. Compared to the powder bed fusion (PBF) process, in which material is shaped by rolling out and filling the metal powder in a tank (bed), molding speed is more than 10 times faster, and with the elimination of the tank for the metal powder, DED lets for the manufacture of larger objects not possible with PBF. Further, the continuous supply of material removes the need to switch materials during the molding process, letting for the growing of blend material components from countless different metal powders. Going forward, this process is expected to be applied for the development of functionally gradient materials joining together components made of countless materials. Along with this technology, MHI Machine Tool is on the verge of achieving practical application of monitoring feedback and local shielding functions, which will enhance the stability of molding quality and allow for the formation of big components.


Exclusively, the monitoring function is a system that uses a camera and sensors to monitor the printing status. The feedback function then utilizes the monitoring results to manage the laser output and other printing conditions in real time, stabilizing the melting and solidification of the metal. Previously, the best printing conditions for various shape were determined through trial and error. The observation and feedback function optimizes the printing conditions automatically, eliminating the need for trial and error. The shielding function purges oxygen from the ambient environment around the nozzle during DED process, blocking oxidation of the melted metal. The local shielding function allows for printing of materials such as titanium and aluminum, which are averse to oxidation, in an air environment without the use of a chamber. Use of these functions also eliminates the restrictions on the size of 3D printing objects, making the system applicable for the manufacture of larger components, which has been an issue in such industries as aerospace. MHI Machine Tool will present the development results of its monitoring feedback and local shielding functions at RAPID + TCT 2019.


Demand for high-performance components made from a variety of materials is projected to increase worldwide, particularly in such industries as aerospace, where components are continually being made lighter, and the automotive industry, which continually demands cutting-edge technologies. MHI Machine Tool is resolving the issues with practical application of metal 3D printing, and going forward, through proposals for formation processes for high-performance materials, will focus on raising awareness and uncovering demand for metal 3D printing. With the new approach of metal additive manufacturing, we will broaden the scope of manufacturing that has reached the limits of conventional cutting and grinding processing technologies.





Directed Energy Deposition (DED) is an additive manufacturing process in which focused thermal energy is used to melt and fuse material.



The new 3D printer applies the results of the development project funded by the New Energy and Industrial Technology Development Organization (NEDO).

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