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负偏差轧制是提高成材率的一个重要手段,前提是钢材定尺且按理论重量交货,其效益大小由负移量的大小来决定。所谓负移量,是公称尺寸与负偏差轧制时的目标尺寸之差。负移量越大,增材率越高,同时,轧制的钢材也越容易超出标准偏差而不能按合同交货,造成质量事故。因此,用什么方法给定负移量?负移量与增材率有什么样的定量关系等等,都是负偏差轧制的前提。本文将以钢板为例,对上述问题进行分析。一、负偏差轧制指数就某一架轧机而言,轧出的同一公称厚度的钢板实测值频率图,通常近似于正态分布,如图1所示。图中h_x为随机抽样的厚
Negative deviation rolling is to improve the rate of finished products is an important means, provided that the steel length and delivery by theoretical weight, the size of its benefit by the amount of negative shift to decide. The so-called negative shift, is the nominal size and negative deviation of the target size difference between the rolling. Negative displacement is larger, the higher the rate of increase, at the same time, the more easily rolled steel exceeds the standard deviation and can not be delivered according to the contract, resulting in quality accidents. Therefore, what method is used to give a negative shift? What is the quantitative relationship between the negative shift and the additive rate, etc., are the premise of negative bias rolling. This article will take steel as an example to analyze the above problems. First, the negative deviation of the rolling index In a rolling mill, rolled out of the same nominal thickness of the measured value of the frequency plate diagram, usually similar to the normal distribution, as shown in Figure 1. H_x is a random sample of thick