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在用试切法加工生产中,当加工被包容面时,操作者总习惯尽量使加工面尺寸接近图纸公差上限;而在加工包容面时,总是习惯于使加工面尺寸接近图纸公差下限。例如,加工内孔时使尺寸偏小,加工外圆时使尺寸偏大等等。大量生产实践表明,试切法加工与调整法加工,其零件尺寸分布规律是不同的,在用调整法加工中,零件尺寸呈正态分布,而在用试切法加工中,零件尺寸呈“偏态分布”。
In trial and cut processing production, when the processing is contained surface, the operator always try to make the processing surface size close to the upper limit of drawing; and in the process of inclusive, always used to make the processing surface size close to the lower limit of the drawing. For example, the size of the processing hole is too small, the outer diameter of the processing of large size and so on. A large number of production practice shows that the trial cutting method of processing and adjustment of processing, the size distribution of parts is different in the use of adjustment method of processing, the size of the parts were normal distribution, and in the trial and cut processing, the part size was “ Skewed distribution. ”