研究目的
To convert a laser beam from a fiber coupled diode laser source from a Gaussian-like distribution to a flat-top distribution for laser hardening and to demonstrate its processing ability on 35CrMo metal steel.
研究成果
A set of HOS successfully converts the diode laser beam to a flat-top distribution, achieving a hardened track with Rockwell hardness of 57 HRC and hardened depth of 1.6 mm on 35CrMo metal steel. The research demonstrates the diode laser source's suitability for industrial laser hardening.
研究不足
The actual hardened track width deviates from the simulation result due to the residual divergence angle of the collimated beam and installation difficulties of the lens group.
1：Experimental Design and Method Selection:
A homogenization optical system (HOS) is designed to convert the beam with a Gaussian-like distribution to a flat-top distribution. The methodology includes the use of cylindrical lens arrays (CLAs) and a subsequent field lens.
2：Sample Selection and Data Sources:
35CrMo metal steel is used as the workpiece for laser hardening experiments.
3：List of Experimental Equipment and Materials:
A fiber coupled diode laser source (DLS), a set of homogenization optical system (HOS), high purity argon as a shielding gas, and a Rockwell hardness tester for measurement.
4：Experimental Procedures and Operational Workflow:
The laser beam is converted to a flat-top distribution using HOS. Hardening experiments are performed by varying laser power and scanning speed. The hardness and hardened depth are measured.
5：Data Analysis Methods:
The homogeneity of the focal beam is evaluated using Zemax simulation. The hardness and hardened depth are measured and analyzed.
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