基于特征单元的设备选型状态空间理论与方法

State space theory and method for equipment selection based on feature-unit

提出零件特征单元加工过程的状态空间理论,并将之用于解决零件加工的工艺设备选型问题.基于复杂零件特征具有多样性和复合性的特点,定义特征单元,以便于分析零件特征.针对单一特征单元,提取特征单元加工前和加工后两个状态,通过分析两个状态变换原因,构建状态变换矩阵,得出状态变换矩阵代表工艺设备加工能力的结论.通过构建状态变换方程描述加工过程.建立状态空间,将工艺设备选型问题转换为加工前和加工后两个状态在状态空间中的路径规划问题.在实际生产的约束条件下,将状态空间中路径规划问题转化为现有工艺路线的优化问题,并且建立工艺设备选型优化模型,优选出较理想的工艺路线,从而选出与该条工艺路线对应的一套工艺设备.应用算例验证了该方法的可行性.

The state space theory of machining process of part feature-unit is proposed to solve the problem of machining production line process equipment selection.Since part features are diverse and complex,feature-unit is defined to facilitate the analysis of part features.For a type of feature-unit, firstly,the two states of feature-unit before and after processing are extracted.Secondly,through analysis of the transforming reason of the two states,the state transformation matrix is constructed, and the conclusion is drawn that the state transformation matrix is on behalf of processing capacity of equipment.Thirdly, the state transformation equation is constructed to describe the machining process.Fourthly,through establishment of the state space,the problem of process equipment selection is translated into the path planning problem.Under the actual production constraint,the path planning problem in state space is translated into existing process routes optimization problem, and process equipment selection optimization model is established to optimize the most ideal process route,so a set of ideal process equipment can be selected.At last,an application example verifies the feasibility of this method.