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大型水轮机叶片铸件热处理过程中,其角部区域容易发生翘曲变形行为,为此,需要设定较大的加工余量,增加了生产投入.本文开发了一种用于实时非接触测量热处理过程中大型铸件变形行为的方法,并将该方法对某企业热处理生产过程中叶片翘曲变形行为和温度场进行了实时检测.发现热处理过程中,叶片角部翘曲变形过程出现了三个拐点,第二个拐点出现时叶片上未发生马氏体相变区域面积的大小决定着叶片最终的残留变形大小.平均气温在10~20℃时,叶片最终残留变形较小;平均气温低于10℃时,容易出现正向的残留变形;平均气温高于20℃时,容易出现负向的残留变形.由气温变化导致叶片最终残留翘曲变形变化范围大,这是导致需要增加叶片加工余量的直接原因.
In the process of heat treatment of large-scale turbine blade castings, warping and deforming are likely to occur in the corner region, therefore, a larger allowance needs to be set and an increase in production input is required.This paper develops a new method for real-time non-contact measurement heat treatment Large-scale casting deformation behavior of the method, and the method of a business heat treatment during the production of leaf warpage deformation and temperature field conducted a real-time detection found that during the heat treatment of the corner of the blade warping deformation of the emergence of three inflection points, the first When the two inflection points appear, the size of the area where the martensite transformation does not occur determines the final residual deformation of the blade.The final residual deformation of the blade is small when the average temperature is 10 ~ 20 ℃, and when the average temperature is lower than 10 ℃ , Prone to positive residual deformation; the average temperature is higher than 20 ° C, the negative residual deformation prone to change from the temperature leaves the final residual warpage deformation range, which led to the need to increase the blade allowance direct the reason.