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Sci. & Tech. Daily: A Successful 3D Printing of Ultra-large Complex Parts of Titanium Alloy by KUST

On September 10th, the headline of the front page ofScience and Technology Dailyis——Kunming University of Science and Technology(KUST) has successfully  made the ultra-large complex parts of titanium alloy.

On September 7th, after more than 200 hours of continuous work, a large-scale complex part of titanium alloy which is close to the limit of the forming space of the equipment was made successfully at the Additive Manufacturing Center of KUST. This is also the largest single complex part of titanium alloy by using laser selective melting until now.

 

 

 

Laser selective melting is a kind of metal 3D printing method. It uses laser as a heat source to scan the paved metal powder according to the data of shape after dispersing, so that the metal powder is melted and accumulated point by point to manufacture   metal parts  directly. The metal parts manufactured by using this method have excellent mechanical properties, high surface quality and dimensional accuracy. This is also a hot research topic in the field of metal 3D printing. Made by KUST Professor Li Zhenhua and his research group, the complex part of titanium alloy has a size of 250×250×257 mm and a weight of over 21kg with the  support.

 

As it is reported, titanium alloy has excellent mechanical properties and property of corrosion resistance. It is widely used in aerospace, chemical, medical and other fields. In the process of metal laser 3D printing, high residual stress is generated. So the problems of stress deformation and cracking during the formation of complex parts have always been the biggest challenge in metal 3D printing, especially in laser 3D printing of titanium alloy. Prof. Li Zhenhua and his team have carried out plenty of preliminary preparation in powder and composition control, optimization in component structure and position , support design and stress release, remote monitoring, etc., and finally they determined the test plan, which has gained valuable experiences for the printing of large complex titanium alloy parts.

 

In recent years, the Additive Manufacturing Center of KUST has made great progress in 3D printing research in aerospace, medical, mold, and many other fields. At present, more than 5,700 undergraduates enter the manufacturing center to study and carry out innovative activities every year. In addition, more than 50 people including professional and technical personnel and both doctoral and master students are engaged in research at the center.

 

 

Translated by: XIE Aiwen, Faculty of Foreign Languages and Cultures

Edited by: Prof. CHE Yongping, Faculty of Foreign Languages and Cultures

Issued by: Division of Overseas Cooperation

Edited by: KUST News Center (Chinese)