Development of Laser Hardening Method for Convex and Concave Corners by Optimally Shaped Spatial Intensity Distribution by High-speed Laser Scanning

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K04116
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Ryukoku University
• Principal Investigator: Ogawa Keiji 龍谷大学, 先端理工学部, 教授 (80405232)
• Co-Investigator(Kenkyū-buntansha): 田邉 裕貴 滋賀県立大学, 工学部, 教授 (00275174)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: レーザ / 空間強度分布 / 焼入れ / 硬度分布 / 高精度

Outline of Final Research Achievements

Laser hardening makes it possible to harden only the necessary areas. It is a remarkable technology that is rapidly being used in industry because it not only improves strength, but also realizes a strain-free and clean working environment. In this research project, steel parts with corner angles (concave and convex) were targeted. Both experiments and analysis were conducted to establish a laser hardening technique to form hardened areas appropriately for a wide variety of corner angles. As a result, a method was found for analytically predicting the time variation of the temperature near the workpiece surface based on the difference in heat capacity between the concave and convex surfaces, and setting appropriate laser irradiation conditions based on the results.

Free Research Field

生産工学・加工学

Academic Significance and Societal Importance of the Research Achievements

レーザ焼入れ時の現象について、非定常熱伝導解析によるレーザ照射後の工作物表面付近の温度履歴に基づいて金属組織の変化を予測したことに学術的意義がある。そして、この知見を応用することで、部品形状および寸法に応じた適切かつ迅速なレーザ照射条件設定が実現され、これまで試行錯誤的な条件設定に悩まされた現状から脱却することができ、レーザ焼入れ技術の産業応用が一層拡大することが期待される。これにより、環境にやさしいものづくり技術の発展に寄与できることから社会的にも意義がある。