Defect-free secondry working of glass and CFRP by on-machine birefringent measurement

2019 Fiscal Year Final Research Report

• Project/Area Number: 17H03154
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Hiromi Isobe 長岡技術科学大学, 工学研究科, 准教授 (60272861)
• Co-Investigator(Kenkyū-buntansha): 原 圭祐 一関工業高等専門学校, その他部局等, 准教授 (30515812) ; 鈴木 厚行 徳山工業高等専門学校, 機械電気工学科, 准教授 (40450142) ; 田邉 里枝 長岡技術科学大学, 工学研究科, 助教 (70432101)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 光弾性法 / 応力分布 / 超音波加工 / 脆性材料 / 研削加工

Outline of Final Research Achievements

In the forming of glass by grinding, high-efficient and defect free working technology is required. In this study, based on the principle of photoelastic method, birefringence information was acquired at high speed and on ‐ machine, and the technology which pursues stress distribution fluctuation and processing condition from the information was developed. The stress state just under the abrasive grain in the drilling to the glass by the electrodeposition grinding wheel and the impact stress fluctuation in the crack generation were observed. In addition, in order to confirm chip generation phenomenon in more detail, stress fluctuation and condition of the processing mark in the scratch test by the single grain abrasive grain were verified. As the result, it was proven that it did not come to the excessive crack by repeating the fine fracture by the ultrasonic vibration in the cutting depth submicron.

Free Research Field

精密加工，精密計測

Academic Significance and Societal Importance of the Research Achievements

これまで，加工現象を観察・検証する方法は，工具動力計によってワークとテーブル間に作用する力の測定，加工部の温度測定，もしくは加工後の被加工面の観察によるものであった．すなわち，加工状態を推測して，加工条件を最適化してきた．本手法では，これまでに観察が困難であった応力の分布を高速度撮影することに成功した．また，難削材加工に効果のある超音波加工の現象を考察するのに有効な手段であることを確認した．