{"created":"2023-06-19T10:30:29.191576+00:00","id":10925,"links":{},"metadata":{"_buckets":{"deposit":"e4c733c5-9a0e-4740-9dcf-79f834396b82"},"_deposit":{"created_by":18,"id":"10925","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"10925"},"status":"published"},"_oai":{"id":"oai:muroran-it.repo.nii.ac.jp:00010925","sets":["41:227"]},"author_link":["59399"],"item_81_date_granted_17":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2022-03-23"}]},"item_81_degree_grantor_10":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"室蘭工業大学"},{"subitem_degreegrantor_language":"en","subitem_degreegrantor_name":"Muroran Institute of Technology"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"10103","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_81_degree_name_11":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）","subitem_degreename_language":"ja"}]},"item_81_description_25":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_81_description_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"薄肉部品は，高度な比強度を実現する構造として現代の製造業で広く使用されています．しかしながら，別の観点から見ると，これらの部品は構造が複雑で，剛性が低く，高精度な加工が必要になります．機械加工中においては，剛性の低い構造特性のため，実際の工作物保持の実施工程と把持具の選択により，薄肉部品の変形は大きく影響されます．さらに，ほとんどの工作物把持工程は手動操作として実行されるため，プロセスのばらつきが大きくなります．これらの変動する固定プロセスは，長い間加工精度を低下させてきました．この研究の目的は，固定力と工作物の変形を効率的かつ迅速に推定するためのオンマシン推定方法を調査することです．この推定により，工作物保持状態の視覚化が可能になり，薄肉部品の加工精度が向上します．本研究では，工作物把持シミュレーションと局所的に測定されたひずみを組み合わせた工作物把持状態の体系的な推定方法を提案し，その妥当性を評価します．提案されたオンマシン推定方法は，さまざまな工作物保持条件（把持シーケンスと固定力）で評価されます．把持された状態での薄肉工作物の推定固定力と工作物の変形を，実験結果と比較した．実験結果との比較から，提案手法は固定力不足や過度の変形などの不適切な工作物保持状態を検出する可能性があることが明らかになりました．この論文では，複数の基盤技術を用いて機械加工プロセスにおける薄肉部品のワーク保持状態を推定するシステムを構築しました．本編の構成は以下のとおりです．まず，本研究の背景として，最近の生産動向をまととめました．現代の製造業に適用される薄肉部品の役割，薄肉工作物加工の動向，薄肉工作物の重要性について整理します．さらに，工作物を把持した状況における工作物把持状態の推定，測定技術の開発，FEM分析，および測定とシミュレーションの組み合わせに関する関連研究の調査結果を示します．次に，本研究の目的を具体的に達成するために設定された4つのステップについて説明します．（1）オンマシン推定の実現可能性の検証（2）工作物固定力の推定（3）工作物把持シーケンスの影響評価（4）測定点の選択手法の構築　そして，オンマシン推定の枠組みを提案します．プロセス変数の考察に基づいて，状態推定のための最適化プロセス，工作物把持シミュレーションの枠組み，複雑形状工作物に対する把持状態推定の流れ，および測定可能点の評価指標の有効性について検討した結果を示します．この研究は，薄肉部品の工作物把持状態推定のための効果的なシステムを構築するためにこれらの方法を連携させる手法を提案しました．さらに，研究目的を達成するための4つのステップに基づいて，提案を検証するために行った，評価実験について紹介します．評価実験の結果から，提案された工作物把持状態の推定方法は，さまざまな工作物把持状況において，工作物把持状態を推定し視覚化することができることが明らかになりました．最後に，本論文の結論について述べます．","subitem_description_language":"ja","subitem_description_type":"Abstract"},{"subitem_description":"Due to the higher structure efficiency and lightweight characteristic, thin-walled parts are widely used in the modern manufacturing industry. However, from another point of view, these parts are complex in structure, have weak stiffness, and high precision demand. During the machining process, because of low rigidity structural characteristics, actual workholding process and fixture selection are heavily affected by the deformation of thin-walled parts. Moreover, most of the fixturing process is executed as manual operations, which generate large process variations. These fluctuated fixturing processes have deteriorated machining accuracy for a long time. The objective of this research is to investigate an on-machine estimation method to achieve an efficient and fast estimation of the fixturing force and workpiece deformation. The estimation enables visualization of workholding states and improves machining accuracies of thin-walled parts. In this research, a systematic estimation method of workholding states which combines fixturing simulation and locally measured strain is proposed and evaluated. The proposed on-machine estimation method is evaluated in different workholding conditions (clamping sequences and fixturing forces). Estimated fixturing force and workpiece deformation for a clamped thin-walled workpiece was compared to the results from the engineering experiments. From the comparison, it becomes clear that the proposed method has the feasibility to detect improper workholding states such as insufficient fixturing force or excessive deformation. In this thesis, several methods are used to build a system to estimate the workholding state of thin-walled parts in the machining process. The main story is described as follows. Firstly, trends of recent production are summarized as a background of this research. Roles of thin-walled parts which apply in the modern manufacturing industry, trends of thin-walled workpiece machining, and the importance of thin-walled workpieces are introduced. Moreover, related researches about workholding state estimation in workholding situations, measurement technology development, FEM analysis, and a combination of measurement and simulation are surveyed. Secondly, to concretely explain the overall objective, the whole research process is illustrated to follow four steps: (1) Feasibility verification of On-machine estimation (2) Fixturing force estimation (3) Effect of clamping sequence (4) Measurement points selection Thirdly, a framework for on-machine estimation is proposed. Based on considerations of process variables, a concept of the iteration optimization process, workholding simulation framework, estimation flow of complex workholding state, and evaluation criterion of measurable points are explained. This research presents these methods to build an effective system of thin-walled parts workholding estimation. Fourthly, several case studies are set to verify our proposal based on the four steps of the objective paragraph. From the results of case studies, the proposed estimation method of workholding state can visualize the fixturing states in various workholding situation. Lastly, the conclusion of the dissertation is described.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_81_dissertation_number_13":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第493号"}]},"item_81_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15118/00010862","subitem_identifier_reg_type":"JaLC"}]},"item_81_subject_9":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"530","subitem_subject_scheme":"NDC"}]},"item_81_text_12":{"attribute_name":"学位の種別","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"課程博士"}]},"item_81_text_14":{"attribute_name":"報告番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"甲第493号"}]},"item_81_text_15":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"博甲第493号"}]},"item_81_text_16":{"attribute_name":"研究科・専攻","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"工学専攻"}]},"item_81_version_type_24":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNameIdentifiers":[],"affiliationNames":[{"affiliationName":""}]}],"creatorNames":[{"creatorName":"曾, 靖凱","creatorNameLang":"ja"},{"creatorName":"ソウ, ジンガイ","creatorNameLang":"ja-Kana"}],"familyNames":[{},{}],"givenNames":[{},{}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2022-06-30"}],"displaytype":"detail","filename":"A493.pdf","filesize":[{"value":"6.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"A493","objectType":"fulltext","url":"https://muroran-it.repo.nii.ac.jp/record/10925/files/A493.pdf"},"version_id":"ec656425-928b-4b3c-a50f-62b86e38d079"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2022-06-30"}],"displaytype":"detail","filename":"A493_summary.pdf","filesize":[{"value":"389.6 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"A493_summary","objectType":"abstract","url":"https://muroran-it.repo.nii.ac.jp/record/10925/files/A493_summary.pdf"},"version_id":"5bcdcfa5-89df-4d2c-88f4-25fce12db473"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"On-machine Estimation of Workholding State for Precision Machining of Thin-walled Parts","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"On-machine Estimation of Workholding State for Precision Machining of Thin-walled Parts","subitem_title_language":"en"},{"subitem_title":"薄肉部品の精密加工のための工作物保持状態の機上推定","subitem_title_language":"ja"}]},"item_type_id":"81","owner":"18","path":["227"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2022-06-30"},"publish_date":"2022-06-30","publish_status":"0","recid":"10925","relation_version_is_last":true,"title":["On-machine Estimation of Workholding State for Precision Machining of Thin-walled Parts"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2024-01-22T02:14:53.793292+00:00"}