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Guo J.,RIKEN | Chee S.K.,Mechano Transformer Corporation
Sensors and Actuators, A: Physical | Year: 2015

The paper presents an experimental study on the key characteristics of a magnetostrictive vibrator being developed for polishing application. Firstly, the actuation principle is systematically illustrated by a general model and experimentally verified by measuring magnetic fluxes flowing in the legs of the vibrator. Then the vibration mode is analyzed by finite element method and proved by node position test. It is found that the experiment result shows good consistent with that of simulation. After that, the effect of external stress on vibration amplitude is tested and the result indicates that under the stress of 0-1 N, the vibration amplitude shows in a rough proportion relationship to the stress. However, when the stress is less than 100 mN, vibration amplitude is almost not changed. Finally, the heat generation of the vibrator is evaluated, and a cooling device is developed for effectively decreasing the operating temperature. © 2014 Elsevier B.V. All rights reserved. Source


Yano A.,Mechano Transformer Corporation
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C | Year: 2010

Piezoelectric actuators using piezoelectric element displacement magnifying mechanism are applied to many kinds of mechanical devices. However, the design of displacement magnifying mechanism depends on experiences and skills of designers and takes much time for optimizing the structure. In this paper the method of structural optimization for displacement magnifying mechanism using FEM and sequential linear programming is proposed. First, the sensitivities of the typical functions, that is, the displacement of nodes, the force of output node, the stress of each elements and the static energy transfer efficiency are formulated. The dictionary of sequential linear programming is constructed out of these sensitivities. Then the optimization procedure which starts from a roughly designed fundamental structure of magnifying mechanism is constructed. Finally the method is applied to an example of punching device to confirm the robustness of the method and the propriety of the optimized structure from the mechanical engineering point of view. Source


Lin W.M.,Gunma University | Chee S.K.,Mechano Transformer Corporation | Suzuki H.,Chubu University | Higuchi T.,University of Tokyo
Advanced Materials Research | Year: 2013

Demands of precision molds with complicated microstructures for digital devices such as DVD pick-up system, and medical devices such as μ-TAS and solar optics etc. are increasing. To enhance precision, the structured molds must be polished after grinding or cutting in order to improve the surface roughness. In this paper, a two-dimensional low frequency vibration (LFV) polishing actuator using PZT is proposed and developed. The LFV consists of four mechanical amplitude magnified actuators, a multilayer stacked piezoelectric actuator (PZT) incorporated with mechanical transformer, and a center piece. In the polishing experiments, HIPM workpieces were polished with WA slurry by the rotation and revolution type polishing method (RRP). The surface roughness of the work pieces and material removal amount (polished amount) was also evaluated. From the experimental results, it was found that the application of low frequency vibration is useful for realizing higher precision in the polishing of micro structured molds. © (2013) Trans Tech Publications, Switzerland. Source


Patent
Mechano Transformer Corporation and Satake Corporation | Date: 2011-05-13

A piezoelectric valve comprising: a valve main body formed in which are a gas pressure chamber that takes in compressed gas supplied from the outside as well as a gas release channel through which the compressed gas is released from the gas pressure chamber; a valve body placed in the gas pressure chamber to open and close the gas release channel; a piezoelectric element that generates, in the form of displacement, a driving force needed to operate the valve body; at least one displacement amplification mechanism that amplifies a displacement of the piezoelectric element and causes it to act upon the valve body; and a driving means for applying voltage to the piezoelectric element in order to drive the valve body to open the valve and thereby open the gas release channel; wherein such piezoelectric valve is characterized in that the driving means applies voltage to the piezoelectric element in multiple stages so as to suppress fluctuation in the amount of gas ejected from the gas release channel when the valve opens.


Chee S.K.,Mechano Transformer Corporation | Suzuki H.,Chubu University | Okada M.,Chubu University | Yano T.,Mechano Transformer Corporation | And 2 more authors.
Advanced Materials Research | Year: 2011

Demands of precision molds with complicated microstructures for digital devices such as DVD pick-up system, medical devices such as μ-TAS and solar optics etc. are increasing [1 - 5]. The structured molds must be polished after grinding or cutting in order to improve the surface roughness. In this paper, a two dimensional low frequency vibration (2DLFV) polishing actuator using PZT is proposed and developed. The 2DLFV consists of 4 mechanical amplitude magnified actuators (MechaTrans), a multilayer stacked piezoelectric actuator (PZT) incorporated with mechanical transformer, and a center piece. Mechanical transformer is a kind of flexure hinges structured that magnifies the stroke of the multilayer stacked piezoelectric actuator around 7 times to 120 μm. With this actuation, the tool vibrates in a circle trajectory to achieve polishing effect. In the polishing experiments, tungsten carbide molds (workpieces) are polished with diamond slurry. The surface roughness of the work pieces and polishing efficiency are evaluated. From the experimental results, it was found that low frequency vibration especially 2DLFV is a useful polishing system for micro structured mold. © (2011) Trans Tech Publications, Switzerland. Source

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