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The heat treatment and surface hardening of metals is a process that is of considerable interest to the metal working community. The use of lasers to accomplish this heat treatment permits one to produce results not possible with other methods. However, due to the somewhat complex nature of this process it can be confusing and it is sometimes difficult to understand exactly how to proceed: What type of beam shaping to use, what type of coatings to apply, what power levels to use, what laser, etc. In this paper , an examination of four distinct methods of beam shaping are presented. They are: 1. Focusing lens only 2. Beam scanner 3. Beam integrating mirror 4. Kaleidoscope (also known as the light pipe) Coating such as graphite paint, Manganese phosphate and black paint are used. The performance of these devices together with these various coatings, is then examined. Also factors such as the following are considered: 1. Power loss in each device 2. Energy uniformity that each produces 3. Penetrations possible 4. Limitations of each 5. Ease of installation and operation 6. Suitability of each for certain applications. Concerning the coatings, such things as: 1. Types 2. Coating thickness are studied. Each device was used in actual heat treatment with the data then examined and presented here with the hope being that specific merits and drawbacks would become evident.© (1989) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
