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迄今为止,浇注系统计算中流量系数μ值的确定仍然是有待解决的重要课题之一。几乎所有浇注系统方面的专门文献,都推荐凭经验选取流量系数μ值。由于浇注系统的种类、结构和尺寸,都与铸件的合金种类、结构尺寸以及铸造工艺方案有关,所以凭经验表格很难选取得准确,因而使浇注系统的计算停滞在半经验、半理论的状态,计算所得到的结果也常常达不到生产要求的精确度。为了使充填铸型的理论更科学化,必须解决μ值的科学计算问题。而μ值计算的关键所在是如何获得精确的浇注系统各部位的阻力系数ζ_i 值。
So far, the determination of flow coefficient μ in the calculation of pouring system remains an important issue to be solved. Almost all of the specialized literature on the casting system, are recommended by experience selected flow coefficient μ value. Due to the type, structure and size of the casting system are related to the type of alloy, the size of the structure and the casting process scheme, it is difficult to select accurately according to the experience form, so that the calculation of the casting system is stagnant in a semi-empirical and semi-theoretical state , The calculated results are often not up to the accuracy of the production requirements. In order to make the theory of filling mold more scientific, we must solve the scientific calculation of μ value. The key of μ value calculation is how to get the accurate resistance coefficient ζ_i of each part of the pouring system.