The Improvement of surface roughness in metal additive manufacturing inner and outer surface applying laser processing technology

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14635
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Tokyo Metropolitan Industrial Technology Research Institute
• Principal Investigator: Murakami Yuichi 地方独立行政法人東京都立産業技術研究センター, 技術支援本部多摩テクノプラザ複合素材技術グループ, 副主任研究員 (10707136)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 金属積層造形 / レーザ加工 / パルスレーザ / 除去加工 / 表面粗さ改善

Outline of Final Research Achievements

In this study, we investigated the possibility of removing stacking marks and adhered powder by irradiating a high-power pulsed laser using the prototype modeling method we have developed. The purpose of this research was to establish a modeling method to improve the surface roughness of the modeled product by (1) clarifying the mechanism of laser removal processing, (2) selecting flying conditions based on the difference between the two types of materials, and (3) confirming the phenomenon of laser removal processing during modeling. In fact, the surface roughness of the side surface of the modeled object was reduced by about 20% by irradiating a high-power pulsed laser.

Free Research Field

付加製造

Academic Significance and Societal Importance of the Research Achievements

金属AM技術は、従来製法では実現不可能な複雑形状を有する高付加価値製品を製造ができ、産業分野での幅い応用が期待されている。一方で、造形物側面は積層痕と固着粉末の影響により、表面粗さが組付け部品の表面粗さの5～10倍程度であるため、後加工が必要となる。後加工は様々な加工方法が検討されてる段階であり、利用が試作レベルに留まっていることが多い。そのため、本研究では、後加工を必要とせずに造形の中に造形物の側面に高出力のパルスレーザを照射することで表面粗さを改善できなか検討をした。