On March 31, the journalist learned from the Harbin Institute of Technology (Weihai) that the school developed the first additive manufacturing equipment to the solid high -power ultrasonic phase in China. This equipment obtained a production power of more than 6,000 watts by applying for the first time the two transducers on both sides in China. Compared to traditional unique transducers, it may suit the additives of stacking and large -scale accumulation with thicker leaves. It can respond to consolidation additives in the solid phase of various metal materials such as copper, aluminum, nickel and titanium. It can also carry out the high quality composite additive manufacturing of heterogeneous materials such as copper / aluminum, aluminum / titanium, and has opened a new process path for the preparation of light functional materials and the implantation without loss of thermal sensitive devices.
Additive manufacturing technology, also known as 3D printing technology, is a technological system that makes parts directly by three -dimensional data. He uses the laminate and stacked to carry out “free manufacturing” and the “form close to the network” of parts, reducing the difficulty of treatment and the manufacturing cost of complex structural parts.
Ultrasound is a sound wave with a frequency exceeding the upper limit of the hearing of the human ear, which triggers a series of physical reactions during the propagation of the environment. In the field of additive manufacturing, ultrasound waves can accurately handle the material on a microscopic scale, generate high local pressure through its high frequency characteristics, then trigger deep changes in the internal microstructure of the substance, in the end of the optimization of materials optimization and improve the quality of treatment. The manufacturing technology of ultrasonic additives based on metallic ultrasonic welding must generate high frequency friction between the layers of metal aluminum paper under a continuous ultrasonic vibration pressure. During the friction process, the oxides and contaminants covered with the metal surface are peelled to expose pure metal. Under the applied pressure, the pure metal material is softened and filled on the surface of the sheet of welded metal aluminum paper through the energy of ultrasonic waves. In this process, the surfaces of the two metal leaves reach an atomic bond to increase the resistance of the welding surface, then it is repeated again and again, the layer by layer and finally formed.
The solid phase connection is a technology to obtain a hardware connection to the solid state. It is not characterized by fusion materials, but rather by diffusion, plastic deformation or mechanical action between atoms. Zhang Hongtao, professor at the Harbin Institute of Technology (Weihai), said that the manufacturing of ultra -ultrasonic additives is a technology for manufacturing green additives based on solid phase. It produces layer of layer by layer of metallic leaves by mechanical energy and thermal energy generated by high frequency ultrasonic vibration. Compared to traditional fusion welding additive processes, its treatment temperature is low. The combined interface can avoid an excessive generation of brittle compounds. At the same time, it can also avoid additional problems such as high temperature oxidation, phase change and residual constraint of the material. It is particularly suitable for the preparation of heterogeneous metal connections and functional gradient materials. However, traditional ultrasonic additive equipment uses a single transducer, as the transducer is insufficient and it is difficult to operate continuously for a long time, it cannot meet the manufacturing needs of metallic components of large region, large region and high resistance.
With the support of the main engineering projects for scientific and technological innovation in the Shandong province, the Shandong Naval Constitting Research Institute and the Weihai Wanfeng Magnnesium Technology Development Co., LTD., the Zhang Hongtao team has started to design and optimize Vibration of ultrasonic vibrations since 2018; At the same time, the team has continuously improved and improved the overall equipment through resonance simulation, improving the roughness of the head and the development of the auxiliary treatment platform, and has finally developed additive manufacturing equipment with completely independent intellectual property rights. The prototype has now entered the test stage.
