Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

The Effect of Ultrasonic Vibration on Cutting Process of Soft Composite Material

Takumi Kamei1,a, Tomohisa Tanaka1 and Tomoki Wakasaki2

1School of Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan

2NSK Ltd.,1-5-50, Kugenumashinmei, Fujisawa, Kanagawa, 251-0021, Japan


Development of cutting technology for micro soft composite materials such as cells and biological tissues is highly important in the fields of regenerative medicine, pathology, and drug discovery. However, soft composite materials are not easy to cut because they deform non-linearly when a blade contacts or their cutting characteristics are non-uniform due to their complex compositions. In terms of cutting of such micro soft composite materials, notable phenomena have been reported that cutting performance can be improved by using ultrasonic vibration knife. A typical example of a knife-type tool using ultrasonic vibration is an ultrasonic cutter, but almost ultrasonic cutters are normally designed for crafting or food processing and are not suitable for cutting of such micro soft composite materials. Also, in general, it has been well known that ultrasonic vibration cutting has advantages such as reduction of frictional force between the blade and the material or hemostatic effect. However, few studies have researched the relationship between the vibration behavior of the ultrasonic knife such as how the blade should be vibrated and the cutting performance of micro soft composite materials. Therefore, the purpose of this study was to reveal the mechanism of ultrasonic vibration cutting of micro soft composite materials in viewpoint of vibration behavior. To conduct experiments, an ultrasonic vibration knife assembly which consists of horn, blade and bolt-cramped Langevin-type transducer was designed using finite element analysis and theoretical equation. Then, the knife was fabricated and after that, the vibration of tool top of the ultrasonic knife was measured. From the result, it was confirmed that the amplitude of axial direction was predominantly larger compared to other directions and therefore, it can be said that the tool vibrated in one axis. By changing the direction of the ultrasonic knife blade, pull-cut and push-cut vibration behaviors were given to the ultrasonic vibration knife. Then, biomodelling material was cut by each type of the knife changing the vibration amplitude. From the experiments, the relationship between vibration direction and amplitude and cutting performance of biomodelling material were obtained.

Keywords: Ultrasonic, Cutting Mechanism, Vibration Mode, Biological Tissue.

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