Kenichi HIROSAKI

Virtual sensor using model order reduction for real-time estimation of tool edge temperature

Masahiro Takano, Masayoshi Shinya, Hiroyasu Miyakawa, Yuta Yoshida et autres

Virtual sensor, which is one of the applications of the digital twin, is effective for estimating physical quantities that are difficult to measure. This paper deals with estimation of real-time tool edge temperature by virtual sensor. The tool edge temperature is estimated …

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Inverted Acetabular Labrum Causes Insufficiency-type Stress Fracture of the Femoral Head: A Biomechanical Study

Kiyokazu Fukui, Mingliang Chen, Ayumi Kaneuji, Eiji Takahishi et autres

Abstract Purpose: Subchondral insufficiency-type fracture is associated with rapidly progressive osteoarthritis of the hip, but are these fractures caused by a single load event such as an injury from a fall or by stress (fatigue) from repeated loading during the activities of …

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A Study on Chatter Vibration Suppression by Bringing a Damping Beam into Contact with Workpiece

Yuta Yoshida, Masahiro Takano, Hiroyasu Miyakawa, Kenichi HIROSAKI

Cutting thin cylindrical workpiece with low stiffness causes chatter vibration. The vibration increases machined surface roughness and cutting tool wear. This study aims to stabilize chatter vibration arising in turning workpiece with low stiffness. For the purpose of stabilizing vibration, the simple …

Development of Miniaturized Machine Tool with Pipe Frame Structure

Naohiko SUZUKI, Yoshitaka Morimoto, Yoshiyuki Kaneko, Kenichi HIROSAKI et autres

Development of Desktop CNC Lathe with Pipe Frame Structure

Naohiko SUZUKI, Yoshitaka Morimoto, Yoshiyuki Kaneko, Kenichi HIROSAKI et autres

While many components used in automobiles, household electric appliances, etc., are becoming more compact, the size of most machine tools used for machining such components remains unchanged. Therefore, to improve the efficient use of factory space and economical use of energy, machine …

Inversion of the acetabular labrum causes increased localized contact pressure on the femoral head: a biomechanical study

Xipeng Wang, Kiyokazu Fukui, Ayumi Kaneuji, Kenichi HIROSAKI et autres

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DIFFERENCE OF STEM SUBSIDENCE AND CEMENT BEHAVIOUR IN THE VARIOUS THICKNESSES OF BONE CEMENT: AN EXPERIMENTAL STUDY USING A COLLARLESS POLISHED TAPERED STEM

Eiji Takahashi, Ayumi Kaneuji, Kenichi HIROSAKI, Makiko Takano et autres

Introduction In cemented total hip arthroplasty (THA), proper cement mantle thickness in the femoral canal is still controversial subject. It is widely accepted that the cement mantle around a femoral stem should be at least 2 mm in thickness. But articles from …

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Thermal Deformation Control of a Pipe Structure Frame CNC lathe

Naohiko SUZUKI, Yoshitaka Morimoto, Yoshiyuki Kaneko, Kenichi HIROSAKI et autres

The miniaturization of many machine parts for machine tools is desired for the purpose of effectively utilizing space, energy saving, and realizing desktop factories. However, it is predicted that the reduction of the calorific capacity of machine leads increase in thermal deformation …

BIOMECHANICAL BEHAVIOR OF STEM AND CEMENT IN A COLLARLESS POLISHED TAPERED STEM AND A FRENCH STEM: AN EXPERIMENTAL STUDY USING AN ORIGINAL BIOMECHANICAL INSTRUMENT

Ayumi Kaneuji, Eiji Takahashi, Tsuda Ryoji, Yoshihiro Numata et autres

Introduction The French paradox regarding cemented femoral components has not been resolved, so we compared the mechanical behavior of a French stem, the CMK stem (Biomet, Warsaw, IN, USA), with a collarless, polished, tapered stem (CPT, Zimmer, Warsaw, IN, USA) using an …

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Development of a precision laser interferometer for roll measurement (Enhancing of sensitivity by retroreflection methods)

Toshihiro Nakayabu, Masato Okada, Naoki ASAKAWA, Yu Kanamaru et autres

Almost all geometric deviations that occur on a machine tool can be detected most precisely with the laser measurement system. However, the roll cannot be detected yet since the interferometer for it is not present. The purpose of the study is to …

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Continuous Movement of Stems and Cement in both Polished and Rough Tapered Femoral Stems in A Biomechanical Model

Ayumi Kaneuji, Kenichi HIROSAKI, Hiroyoshi Iwaki

Polished tapered stems used in hip replacement subside into bone cement without loosening. However, subsidence of rough stems leads to loosening of the prosthesis. There have been no reports on continuous movement of cement and stem. We believed that the relation of …

Vibration Control of CNC Lathe with Pipe Structure Frame

Yoshitaka Morimoto, Naohiko SUZUKI, Yoshiyuki Kaneko, Minoru Isobe et autres

Development of machine tool according to minimization of parts size has been required by downsizing of parts and progress of high precision. A new CNC lathe has been developed combining the enough rigidity and space utility for chip treatment based on the …