研究目的
To propose a new method for reducing residual stress generated by laser cutting by applying light indentation on the sheet metal edge.
研究成果
The proposed method of applying light indentation on the sheet metal edge significantly reduces the residual stress generated by laser cutting, as confirmed by FEM analyses and experiments. The warp was reduced to one-tenth of that without the treatment, making it suitable for industrial applications. The method is simple, effective, and has minimal impact on product quality.
研究不足
The method requires precise control of the indentation pressure and position, which may be challenging considering the variability in sheet thickness. Additionally, the residual stress is not completely eliminated but balanced to reduce warping.
1：Experimental Design and Method Selection:
FEM analyses were conducted to study the feasibility of the method, determine the method of applying indentation, and optimize the conditions. Experiments were then conducted for verification.
2：Sample Selection and Data Sources:
Cold-rolled steel sheet SPCC was used as the material for the experiments.
3：List of Experimental Equipment and Materials:
CO2 laser for cutting, punch for applying light indentation, and optical microscope for measuring curvature.
4：Experimental Procedures and Operational Workflow:
The method involved applying light indentation on the sheet metal edge after laser cutting, followed by U-bending to measure the warp height.
5：Data Analysis Methods:
The residual stress distribution was calculated from the curvature measured after wire cutting, using a specific formula.
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