【摘要】 零件加工过程中存在多种误差源,包括零件基准、夹具、机床等等。现有的误差分析模型大多只对单方面的误差因素进行建模,缺乏将各种误差综合起来并统一分析的模型。在误差流模型和机床误差模型的基础上,采用齐次坐标变换的方法,将加工过程中占主要部分并且较为规则的几何误差统一整合到一个误差数学模型中,从全局的角度对误差进行综合分析。根据该几何误差模型可以对零件特征位置误差进行分析预测,对超出误差限制的零件及时停止后续无效加工,或根据预测值计算补偿量从而改进工艺,最后以实例对该模型的应用加以说明。更多还原

【Abstract】 There are lots of error sources influencing part accuracy in machining process such as datum,fixture and machine tool. But all the derived error models till now focus on only one aspect such as fixture or machine tool. In this paper,a mathematical model which integrates all the main geometric errors was derived based on stream of variation and machine tool error models using homogeneous transformation. With this model,producers can analyze and predict the part error before machining so that they can avoid useless following machining process if the error estimation is out of limitation or they could compensate the error based on the error estimation. At last,an example is used to illustrate the application of this error model.更多还原