The existing tolerance value table is imperfect, resulting in a range of issues such as batch production, surface quality and machining accuracy in designing and processing microminiature parts. For solving such problems,a concept of relative accuracy factor was put forward to study the scope of micro-scale and meso-scale on analysis of the existing standard tolerance value table. The corresponding standard tolerance values in this scale can be obtained based on MATLAB curve fitting method, which established the mathematical model of the relative accuracy factor and the size of the geometrical mean value. These values provide some references for improving the existing tolerance value table.

micro-scale, meso-scale, tolerance, accuracy, curve fitting

在设计和加工微小型零件时,由于现有公差数值表缺少对微米和中间尺度的描述,因而使得批量生产和控制表面质量、加工精度极为不便。针对该问题,以微米和中间尺度为研究范围,在分析现有标准公差数值表的基础上,提出了相对精度因子的概念,并基于MATLAB曲线拟合的方法,建立了相对精度因子与尺寸几何平均值的数学模型,从而得到该尺度区间相对应的公差数值,为完善现有标准公差数值表提供参考。

微米尺度, 中间尺度, 公差, 精度, 曲线拟合