研究者詳細 - 児玉　紘幸

論文 - 児玉　紘幸

分割表示 90 件中 41 - 60 件目／全件表示 >>

Study of Surface Integrity in Micro-groove Cutting of Anisotropic Material 査読

Hiroyuki Kodama, Koichi Okuda, Yuji Kishi

Proc. of euspen’s 17th International Conference & Exhibition 2017年5月

Toolwear and surface roughness in milling of die steel using binderless CBN end mill 査読

Kazuya Hamaguchi,Hiroyuki Kodama*,Koichi Okud

International Journal of Automation Technology 11 ( 1 ) 84 - 89 2017年1月

Analysis of drilling process knowledge derived from microdrill catalog database using data-mining method 査読

Shogo Tabata, Eiichi Aoyama, Toshiki Hirogaki, Hiroyuki Kodama

Proceedings of the ASME Design Engineering Technical Conference 1 2017年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：AMER SOC MECHANICAL ENGINEERS

As electronic devices and products are being miniaturized, the printed wiring boards (PWBs) within them are also being miniaturized. Therefore, it is becoming increasingly difficult to decide the drilling conditions required for producing small-diameter and high-density holes. We have been focusing on drilling conditions recommended in drill catalogs and have been attempting to gather knowledge that drilling experts use to decide the drilling conditions. In this study, we classify drills using the relationship between the diameter and the flute length and hence show that the methods used for setting the cutting conditions are different in different regions of a PWB. In addition, by using a catalog of microdrills that use alloy steel as the work material, we discuss how unique drilling conditions can be set for PWBs.

DOI： 10.1115/DETC2017-67680

Web of Science

Scopus

researchmap

Abnormality diagnosis based on processing reaction force in deburring by rotary brush

Takumi Hatano, Masayuki Nunobiki, Koichi Okuda, Hiroyuki Kodama

ISAAT 2017 - Proceedings of the 20th International Symposium on Advances in Abrasive Technology 673 - 678 2017年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：20th International Symposium on Advances in Abrasive Technology, ISAAT 2017

Recently, automation and labor saving are advancing in the factory. It is necessary to develop some abnormality diagnostic system, because operators usually leave a machining device after mounting tools and workpieces on the machining device. This research developed an abnormality diagnostic method for deburring process using an articulated robot with a rotary brush device. It was able to detect some abnormalities such as erroneous mounting of the rotary brush and heavy wear of the brush which have a bad influence on processing performance. In our experiment, the rotary brush was pressed against a surface of test piece slowly, the processing reaction force after contact are measured, and the increasing ratio of the reaction force was calculated. In case of erroneous mounting of the rotary brush, larger reaction force than usual was observed. In case of heavy wear of the brush, the increasing ratio of the reaction force differed from the ratio of normal brush. It was clarified that appearance of the reaction force depends on the state of rotary brush.

Scopus

researchmap

USING CATALOG DATA MINING IN SUPPORT OF DETERMINING MICRO END-MILLING CONDITIONS 査読

Hiroyuki KODAMA, Koichi OKUDA, Takuya TSUJIMOTO

Proc. of ASME2016 International Symposium on Flexible Automation 2016年12月

Investigation of Lithium Niobate Finished Surface Quality from Viewpoint of Crystallographic Orientation 査読

Yuji KISHI, Hiroyuki KODAMA, Koichi OKUDA

2016 International Conference on Machining Materials and Mechanical Technologies 2016年10月

Effect on Processing Quality of Impurities in Coolant Used in Grinding Stainless Steel 査読

Hiroyuki KODAMA, Koichi OKUDA, Yuuki TAKENAKA and Taizou KAKO

2016 International Conference on Machining Materials and Mechanical Technologies, 2016年10月

Experimental Research on Small-Diameter Deep-hole Drilling of Austenite Stainless Steel 査読

Hiroyuki Kodama, Koichi Okuda, Toshiya Yamaguchi

Materials Science Forum 874 481 - 486 2016年10月

Characteristic of Tool Wear in Small end Milling of Nickel-Titanium Alloy 査読

Kazuya Hamaguchi, Hiroyuki Kodama, Koichi Okuda

Materials Science Forum 874 429 - 432 2016年10月

Decision Methodology of Micro end-milling Condition Using Tool Catalog Data-Mining System 査読

Hiroyuki Kodama, Koichi Okuda, Takuya Tsujimoto

Proc. of euspen’s 16th International Conference & Exhibition 2016年6月

Chip Formation during Precision Cutting of Metallic Glass 査読

Hiroyuki Kodama, Koichi Okuda, Tsukasa Inada

Advanced Materials Research 1136 265 - 270 2015年11月

An Experimental Study on Slotting of Inconel 718 Thin Sheet 査読

Hiroyuki KODAMA, Koichi OKUDA, Tomoya HAYASE

Journal of Mechanics Engineering and Automation 5 ( 11 ) 601 - 608 2015年11月

Machining Accuracy and Cutting Temperature Property in Deep Hole Drilling of Stainless Steel 査読

Toshiya Yamaguchi, Koichi Okuda, Hiroyuki Kodama, Taizo Yamamoto, Tsubasa Takeda

Advanced Materials Research 1136 162 - 167 2015年11月

Investigation of micro-drilling conditions of printed wiring board based on data-mining of catalog information

Yoshimasa Suzuki, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Hiroyuki Kodama

Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015 2015年10月

掲載種別：研究論文（国際会議プロシーディングス）

As electronic devices and products are being miniaturized, Printed Wiring Boards (PWBs) within them are also being miniaturized. Therefore, drilling conditions for small and high density holes have become more difficult to decide. We focused on drilling conditions recommended in drill catalogs and attempted to find out the knowledge that experts of drilling use to decide drilling conditions. In this paper, we focused on web thickness, one of the drill parameters, and qualitative variables written in the catalogs. The results clarified the importance of web thickness in drilling conditions and meaning of qualitative variables.

Scopus

researchmap

Monitoring of End-Mill Process Based on Infrared Imagery with a High Speed Thermography 査読

Masatoshi Shindou, Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama

Key Engineering Materials 625 213 - 218 2015年7月

A Study on Tool Damage of Threading Tap in Screw Cutting of Stainless Steel 15-5PH 査読

Jinno Hayashi, Koichi Okuda, Hiroyuki Kodama

Key Engineering Materials 656-657 164 - 167 2015年7月

Experimental Verification of Lithium Niobate Cutting Phenomena from the View Point of Crystallographic Orientation 査読

Hiroyuki Kodama, Koichi Okuda, Masaaki Harada, Tsunemasa Saiki, Kazuya Hamaguchi

Proc. of euspen’s 15th International Conference & Exhibition 323 - 324 2015年6月

Influence of tool shape and coating type on machined surface quality in face milling of CFRP 査読

Tatsuya Furuki, Toshiki Hirogaki, Eiichi Aoyama, Hiroyuki Kodama, Keiji Ogawa

Advanced Materials Research 1017 310 - 315 2014年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Trans Tech Publications Ltd

Since demands for Carbon Fiber Reinforced Plastics (CFRP) are increasing, the number of the studies on machining of CFRP is also increasing. However, since there are already reports on a trimming of a surplus portion or a drilling, we focus on a face machining and a generating the step shape with several cutting tools. Problems in the machining of CFRP include an occurrence of the burr and delamination. Therefore, in this report, we investigate these problems in face milling. And, the machining behavior (Cutting temperature, Cutting force) during the machining is estimated.

DOI： 10.4028/www.scientific.net/AMR.1017.310

Scopus

researchmap

Investigation of chatter vibration in end-milling process by considering coupled system model 査読

Kosuke Hattori, Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama

Advanced Materials Research 939 201 - 208 2014年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：TRANS TECH PUBLICATIONS LTD

Chatter vibration in cutting processes usually leads to surface finish degradation, tool damage, cutting noise, energy loss, etc. Self-excited vibration particularly seems to be a problem that is easily increased to large vibration. The regenerative effect is considered as one of the causes of chatter vibration. Although the chatter vibration occurs in various types of processing, the end-milling is a typical process that seems to cause the chatter vibration due to a lack of rigidity of one or more parts of the machine tools, cutting tool, and work-piece. The aim of our research is to propose a simple method to control chatter vibration of the end-milling process on the basis of a coupling model integrating the related various elements. In this study, hammering tests were carried out to measure the transfer function of a machine tool and cutting tool system, which seems to cause vibration. By comparing these results, finite elemental method (FEM) analysis models were constructed. Additionally, cutting experiments were carried out to confirm the chatter vibration frequencies in end-milling with a machining center. In the hammering tests, impulse hammer and multiple acceleration pick-ups are connected to a multi-channel FFT analyzer and estimate the natural frequencies and natural vibration modes. A simplified FEM model is proposed by circular section stepped beam elements on the basis of the hammering test results, considering a coupling effect. In comparisons of the calculated results and hammering test results, the vibration modes are in good agreement. As a result, the proposed model accurately predicts the chatter vibration considering several effects among the relating elements in end-milling. Moreover, it can be seen that the chatter vibration is investigated from a viewpoint of the integrating model of the end-milling process. © (2014) Trans Tech Publications, Switzerland.

DOI： 10.4028/www.scientific.net/AMR.939.201

Web of Science

Scopus

researchmap

赤外線サーモグラフィ画像の解析に基づくエンドミル加工温度の解明査読

新堂正俊, 松田亮, 児玉紘幸, 廣垣俊樹, 青山栄一

砥粒加工学会誌 58 ( 7 ) 457 - 462 2014年

記述言語：日本語出版者・発行元：社団法人砥粒加工学会

本研究では，現場で比較的容易に加工状態を診断する手法として，連写機能を有する赤外線サーモグラフィからの画像分析によるエンドミル加工時の工具温度のモニタリング手法に取り組んだ．工作物としてステンレス鋼の中でも難削材に分類される耐熱鋼SUS310を対象とし，工具径（熱容量）や刃数の違いと加工時のエンドミル工具温度の関係を考察した．連写機能における撮影フレームレートを考慮することで，加工時の工具回転角の影響も含めて簡易的な工具温度の計測が可能であった．さらに計測結果と有限要素法（FEM）による非定常温度解析の結果を比較考察し，計測された温度の妥当性についても検討した．

DOI： 10.11420/jsat.58.457

<児玉 紘幸>

論文 - 児玉 紘幸

<児玉　紘幸>

論文 - 児玉　紘幸