After more than 200 hours of continuous work, a super-size titanium alloy complex part approaching the space limit of equipment forming was trial-manufactured in the additive manufacturing center of kunming university of technology on September 7, which is also the largest single titanium alloy complex part formed by laser precast melting method to date.
Laser precinct melting is a kind of metal 3D printing method. It takes laser as a heat source to scan the metal powder laid according to the shape data of the dispersed parts, so as to melt and accumulate the metal powder point by point and realize the direct manufacturing of metal parts. The metal parts produced by this method have good mechanical properties, high surface quality and high dimensional accuracy, which is a hot research topic in the field of metal 3D printing. Made by professor lai zhenhua's team, the complex titanium alloy has a size of 250 x 250 x 257 mm.
According to the introduction, titanium alloy has excellent mechanical properties and corrosion resistance, and is widely used in aerospace, chemical, medical and other fields. In the process of metal laser 3D printing, high residual stress will be generated, and the stress deformation and cracking of complex structure parts during forming are always the biggest challenges faced by metal 3D printing. These problems are more prominent in the case of titanium alloy laser 3D printing. Li zhenhua and his team carried out a lot of preliminary work on powder and component control, component structure and position optimization, support design and stress release, remote monitoring and other aspects, and finally determined the test program, which accumulated valuable experience for the completion of large complex titanium alloy parts printing.
In recent years, the additive manufacturing center of kunming university of science and technology has made great progress in the research of 3D printing in the fields of aerospace, medical treatment and mold. At present, more than 5,700 undergraduates enter the manufacturing center every year to study and carry out innovative activities. There are more than 50 professional technicians and doctoral and master degree students working in the center.