聚氨酯泡沫合成轨枕产品均匀性评价研究

Study on Uniformity Evaluation of Polyurethane Synthetic Sleeper

产品性能均匀性尤其是弯曲强度均匀性是聚氨酯泡沫合成轨枕的一个重要技术衡量指标。通过对弯曲强度与密度关系进行研究,发现弯曲强度与密度基本正相关,并通过数值拟合建立了弯曲强度σ与密度ρ的数学关系模型σ=180ρ^(2)。根据该模型的密度进行预测,其弯曲强度最大误差为6.97%,而采用10个样品的密度均值进行预估,则预估准确度可达98.92%。根据试验结果并结合产品技术指标要求,提出了±15%的密度离散性指标。该研究结果对于聚氨酯泡沫合成轨枕的质量检测、把控及优化均有重要实践意义。

The uniformity of product was an important technical index for the polyurethane synthetic sleepers.The relationship between bending strength and density was studied. The results showed that there was a positive correlation between bending strength and density,and a mathematical model σ = 180 ρ^(2)was established by numerical fitting. Predictions were made based on the density of model,the maximum error of bending strength was 6.97%,while the prediction accuracy could reach 98.92% by using the mean density of 10 samples. According to the test result and the technical requirements of the product,the density discrete index of ± 15% was proposed. The research results had important practical significance for the quality inspection,control and optimization of the synthetic sleepers.