研究目的
To establish a 3D transient FE model for predicting the temperature distribution in workpiece during LAM process, focusing on the temperature inside the workpiece to control the machined surface quality.
研究成果
The FE model is feasible for predicting workpiece temperature in LAM, with good agreement between simulated and experimental results. Workpiece temperature increases with laser power and decreases with feed speed. Laser spot size affects temperature, while incident angle has little impact. Optimized laser power is recommended for quality control.
研究不足
The model assumes workpiece material properties are independent of temperature, no heat transfer between the workpiece and the fixture, negligible thermal energy produced by material removal, and negligible geometry change of the workpiece. These assumptions may limit the model's accuracy under certain conditions.
1：Experimental Design and Method Selection:
A 3D transient FE model was developed using ABAQUS
2：13, incorporating a moving Gaussian laser heat source model implemented as a user-defined subroutine (DFLUX) in FORTRAN. Sample Selection and Data Sources:
The workpiece was a block of blackened AerMet100 steel. Temperature signals were collected by INOR fast response thermocouples.
3：List of Experimental Equipment and Materials:
A diode laser system (HDLS-1000), a square shoulder milling cutter (Kennametal, STELLRAM 7690VA12CA025Z03R40-3), and a carbide insert (Kennametal, ADHT12T308ER-46 SP6519) were used.
4：Experimental Procedures and Operational Workflow:
Machining experiments were carried out under different process parameters (laser power, spindle speed, and feed per tooth).
5：Data Analysis Methods:
The peak temperatures measured by thermocouples were averaged and compared with simulated results.
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