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激光已不再是工业加热领域中的一种实验现象。由于二氧化碳激光器已成功地用于焊接和切割等作业,如切割F—14战斗机钛翼桁架和水平安定面镶板,所以现在看来可以用于热处理。关于输出功率大于10瓩的连续波CO_2激光器的应用,在1974年美国金属学会热处理会议上的“多用途热处理工具—高功率激光器”报告中已有论述。激光器用于热处理是基于以下两个基本观点:1.通过马氏体转变来提高铸铁或钢的表面硬度;2.通过表面熔化和往熔化层内添加合金使表面硬化。有代表性的两工位激光装置如图1所示。它是为工业部门应用而设计的。典型的激光装置由功率调整装置、特制的控制台、激光源(一个7呎立方形箱)、激光束定向装置和工件传送附件所组成。
Laser is no longer an experimental phenomenon in the field of industrial heating. Since carbon dioxide lasers have been used successfully for jobs such as welding and cutting, such as cutting titanium wing truss and horizontal stabilizer panels for F-14 fighters, they now appear to be used for heat treatment. The use of continuous wave CO_2 lasers with output powers greater than 10, is discussed in the 1974 report “Multipurpose Heat Treatment Tools - High Power Lasers” at the American Society for Metals Heat Treatment Conference. The use of lasers for heat treatment is based on the following two basic points: 1. Increasing the surface hardness of cast iron or steel by martensitic transformation; 2. Hardening the surface by surface melting and addition of an alloy to the melt layer. A representative two-station laser device is shown in Figure 1. It is designed for industrial applications. A typical laser unit consists of a power adjustment unit, a custom console, a laser source (a 7-foot cube), laser beam directing unit and workpiece transfer attachments.