Research Career 【 display / non-display 】

Research Career 【 display / non-display 】

• Hot satamping of quenchable steel sheet and heat treatable aluminium alloy sheet

  Project Year：  -   

Thesis for a degree 【 display / non-display 】

Thesis for a degree 【 display / non-display 】

• 加圧・加熱履歴を制御した塑性加工に関する研究

  前野　智美 

    2011.12

  Doctoral Thesis   Single Work

  　View Summary

  豊橋技術科学大学大学院工学研究科 自動車部品の軽量化を背景に，加圧・加熱履歴を制御した成形プロセスについて提案し検討を行った． 中空部品を製造するチューブハイドロフォーミングにおいて，内圧履歴を制御して，局部的に肉厚減少が集中しない圧力履歴および，成形途中のしわを利用して成形中の割れを抑制する圧力履歴を持つハイドロフォーミングを開発した．成形荷重の大きくなる板鍛造において荷重振動を用いる板鍛造を開発した．荷重振動鍛造では，除荷において弾性回復量の違いから金型と板材の間に隙間が生じ，潤滑剤は自動的に隙間に浸入して板材が再潤滑され，摩擦が低減された．冷間で延性の低いアルミニウム合金管の成形限界を向上するために金型内通電加熱を用いたアルミニウム合金管の熱間チューブガスフォーミングを開発した．超高張力鋼歯形ドラムを対象に冷間で絞りしごき成形された容器の側壁を通電加熱する温・熱間スプライン成形を開発した．ダイクエンチされた鋼板をせん断で穴抜きするために局部通電加熱穴抜き加工法を開発した．ホットスタンピングにおいて強度分布を有する超高張力鋼成形品を製造するために，一部分だけを加熱する部分バイパス通電加熱を用いたホットスタンピング加工を開発した．

• 管材のハンマリングハイドロフォーミングにおける成形性向上のメカニズムの研究

  前野　智美 

    2005.03

  Master Thesis   Single Work

  　View Summary

  豊橋技術科学大学大学院工学研究科修士課程生産システム工学専攻 金型に挿入した管材の内部に水圧を加えながら管材を軸方向に圧縮して成形するチューブハイドロフォーミングにおいて，成形性向上が報告されている内圧振動のメカニズムをフリーバルジ成形において検討した．内圧振動ありとなしで異なる張出し形状が得られ内圧振動ありでは局部的な変形を抑制できることが分かった．また，変形挙動をビデオで観察することによって，しわの発生と消去を繰り返すことが局部的な張出しを抑制することが明らかになった．

Papers 【 display / non-display 】

Papers 【 display / non-display 】

• Blanking immediately after heating and ultrasonic cleaning for compact hot-stamping systems using rapid resistance heating

  Tomoyoshi Maeno, Ken-ichiro Mori, Tomoki Ogihara, Tomohiro Fujita

  International Journal of Advanced Manufacturing Technology ( Springer )  97 ( 9-12 )   3827–3837   2018.06  [Refereed]

  Joint Work

  　View Summary

  To produce ultra-high-strength steel parts for improving fuel consumption and collision safety of automobiles, a compact hot-stamping process having resistance heating was developed. In this process, a blanking operation was introduced immediately after heating to deal with non-rectangular blanks in resistance heating. By blanking, not only were the blank shapes optimised for stamping but the formability was also improved by removing both non-heating edges in contact with the electrode. A rectangular quenchable steel sheet was resistance-heated; the sheet was immediately blanked into the desired shape, and the blank was hot-stamped. In addition, reinforcements used for a body-in-white were hot-stamped using the proposed process to examine the applicability. The reduction in thickness of the hot-stamped reinforcement using a hot-blanked sheet was reduced compared with that using a rectangular blank. The formability was improved by blanking immediately after heating. Moreover, ultrasonic cleaning with diluted hydrochloric acid removed the thin oxide scale caused by resistance heating, and the spot-resistance weldability and electrodeposition paintability were improved. Blanking immediately after heating and ultrasonic cleaning are useful for practical hot-stamping processes using resistance heating.

  Web of Science DOI

• Use of liquid lubricant for backward extrusion of cup with internal splines using pulsating motion

  T. Maeno, K. Mori, Y. Ichikawa, M. Sugawara

  Journal of Materials Processing Technology ( Elsevier )  244   273 - 281   2017.06  [Refereed]

  Joint Work

  Web of Science DOI

• Hot stamping of high-strength aluminium alloy aircraft parts using quick heating

  Tomoyoshi Maeno, Ken-ichiroMori, Ryosuke Yachi

  CIRP Annals   66 ( 1 )   269 - 272   2017.04  [Refereed]

  Joint Work

  Web of Science DOI

• Improvement of formability using partial cooling during transfer in hot stamping of ultra-high strength steel parts

  Yasutaka Suzuki, Ken-ichiro Mori, Tomoyoshi Maeno, Kazuki Sakakibara, Yohei Abe

  Procedia Manufacturing ( Elsevier )  15   1119 - 1126   2018.08  [Refereed]

  Joint Work

  DOI

• Reduction in holding time at bottom dead centre in hot stamping by water and die quenching

  Yuki Nakagawa, Ken-ichiro Mori, Tomoyoshi Maeno, Yoshitaka Nakao

  Procedia Manufacturing ( Elsevier )  15   1111 - 1118   2018.08  [Refereed]

  Joint Work

  　View Summary

  A water and die quenching process with submerged tools was developed to improve the productivity of hot stamping. Although heated steel sheets are cooled only by the tools in the conventional hot stamping operation, the bent sheets are cooled by water around tools in the water and die quenching process, and thus the holding time at the bottom dead centre is reduced. The sheets were bent into a hat shape to examine the quenchability and deformation behaviour. For 1.6 mm in thickness, the holding times for sufficient hardening and the prevention of springback were 5 s and 20 s with and without water, respectively. Furthermore, the holding time was reduced by bottoming due to the increase in heat transfer coefficient.

  DOI

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Review Papers 【 display / non-display 】

Review Papers 【 display / non-display 】

• Implemention report on student research meeting of JSTP young research members at three kanto branches

  Bulletin of the japan society for technology of plasticity ( japan society for technology of plasticity )  1 ( 4 ) 285   2018.04

  Meeting report etc.   Single Work

• Full Hardening in Hot Stamping Using Rapid Resistance Heating

  T. Maeno

  SOKEIZAI ( SOKEIZAI Center )  56 ( 7 ) 2 - 7   2015.07

  Introduction and explanation (scientific journal)   Single Work

• Report on Metal Forming 2014

  Journal of the Japan Society for Technology of Plasticity ( The Japan Society for Technology of Plasticity )  56 ( 648 ) 19 - 20   2015.01

  Introduction and explanation (scientific journal)   Single Work

• Development of Hot Stamping Process for Aircraft Titanium Alloy Parts Using Resistance Heating

  YAMAZAKI Kiyoshi, YAMAGUCHI Takashi, MURAYAMA Yohei, MORI Ken-ichiro, MAENO Tomoyoshi

  Journal of the Japan Society for Technology of Plasticity ( The Japan Society for Technology of Plasticity )  55 ( 647 ) 1097 - 1101   2014.12

  Introduction and explanation (scientific journal)   Joint Work

• Gas Forming of Ultra-High Strength Steel Hollow Part Using Resistance Heating

  T. Maeno

  SOKEIZAI ( SOKEIZAI Center )  55 ( 11 ) 16 - 21   2014.11

  Introduction and explanation (scientific journal)   Single Work

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Academic Awards Received 【 display / non-display 】

Academic Awards Received 【 display / non-display 】

• ICTP2014 Best Paper Award

  2014.10   ICTP Standing advisory board   Gas forming of aluminium alloy tube using air filled into sealed tube and resistance heating

• The 12th ISPF for the Most Outstanding Presentation

  2009.03   The Japan Society for Technology of Plasticity   Reduction of Friction in Forging of Plates by Load Oscillation

  Winner： Tomoyoshi Maeno

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(B)

  Project Year： 2018.04  -    Investigator(s): Ken-ichiro Mori

• Grant-in-Aid for Scientific Research(C)

  Project Year： 2018.04  -    Investigator(s): Tomoyoshi Maeno

• Grant-in-Aid for Scientific Research(C)

  Project Year： 2015.04  -  2018.03  Investigator(s): Tomoyoshi Maeno

• Grant-in-Aid for Young Scientists(B)

  Project Year： 2013.04  -  2015.03  Investigator(s): Tomoyoshi Maeno

• Investigation of mechanism of load pulsation, and applying for forming of parts having small thickness

  Grant-in-Aid for Young Scientists(B)

  Project Year： 2010.04  -  2012.03  Investigator(s): Tomoyoshi Maeno

  　View Summary

  To prevent a sharp rise in load in compression of plates, a compression process using load pulsation was developed. The mechanism of the load pulsation was investigated. The load pulsation was applied for backward extrusion, flange forming and bulk forming of stainless steel sheet. The forming load was decreased and accuracy of the formed shape was increased by the load pulsation.

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Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• Effect of surface quality of hot-stamped products using resistance heating on spot weldability and adhesion of electrodeposition coating

  T. Maeno, T. Ogihara, K. Mori, T. Fujita, K. Sakakibara

  66th Japanese Joint Conference for the Technology of Plasticity  (Fukushima)  2015.10   The Japan Society for Technology of Plasticity

• Deformation behavior and quenchability in hot stamping of thin steel sheets without holding at bottom dead center

  Y. Nakagawa, T. Maeno, K. Mori

  66th Japanese Joint Conference for the Technology of Plasticity  (Fukushima)  2015.10   The Japan Society for Technology of Plasticity

• Forming and quenching behaviours in hot stamping of thin quenchable sheets

  Y. Nakagawa, T. Maeno, K. Mori

  ICNFT2015  (Glasgow, UK)  2015.08  

• Full hardening of products in hot stamping using rapid resistance heating

  T. Maeno, K. Mori, M. Sakagami, Y. Nakao,

  CHS2 2015  (Toronto, Canada)  2015.06  

• Successive Forging of long plate having inclined cross-section

  Liyana Tajul, T. Maeno, K. Mori

  ICTP2014  (Nagoya, Japan)  2014.10  

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Past of Collaboration and Commissioned Research 【 display / non-display 】

Past of Collaboration and Commissioned Research 【 display / non-display 】

• Development of forging of hollow products using fluid mandrel and pulsating motion 1st report

  Cooperative Research within Japan  

  Project Year： 2018.05  -   

Social Contribution(Extension lecture) 【 display / non-display 】

Social Contribution(Extension lecture) 【 display / non-display 】

• Metal Forming 2018, 17th International Conference on Metal Forming

  2018.09

  　

  　

• The 2018 japanese spring conference for the technology of plasticity

  2018.05

  　

  　

• 11th International Conference on Technology of Plasticity (ICTP2014)

  2014.10

  　

  　

• Advanced Tube Forming Special Session in ICTP2014

  2014.10

  　

  　

• The 65th Japanese Joint Conference for the Technology of Plasticity

  2011.10

  　

  　

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