Research On Tool Dynamic Configuration Optimization In Machining Center Magazine

The production organization model is changing from product-oriented to customer-oriented,demand-oriented and service-oriented.This means that the processed products have smaller batches,more frequent replacement of processed products,and shorter delivery times required by customers.This is how to improve manufacturing.System efficiency and production flexibility put forward higher requirements.Machining centers are an important part of an automated production line or a flexible manufacturing cell.Because of the limited capacity of the magazine and tool demand diversity of process,there must be a tool change in the machining process.The tool change process requires downtime,adjustments and setup,etc.,which will affect the productivity and efficiency of the entire production system.The problem of dynamic tool configuration in tool magazine of machining centers is an important decision-making issue in the operation and control of automated production lines or flexible manufacturing units: how to reasonably and dynamically configure the tools in the tool magazine to minimize the total number of tool changes after completing a batch of tasks,or to minimize the total cost of tool change.By studying the tool dynamic configuration optimization method in the machining center,it has clear practical application prospects and important theoretical research significance for improving the efficiency of the production system,shortening the delivery time and reducing the cost.An automated production line(unit)with turning and milling machining center is taken as the background,and the optimization goal of minimizing the total tool change cost is given under the given machining task in the machining center of the production line in the text.The tool dynamic configuration optimization problem in the tool magazine is studied.The main research works as following:Firstly,a detailed analysis of the operation process of an automated production line(flexible manufacturing unit)with turning and milling machining centers in an enterprise is described.The dynamic configuration optimization of the tool in the machining center of the machining center is described,and the state variables are given.Decision variables,constraints,and optimization goals,a mathematical model is established by using dynamic programming methods;Secondly,according to the established mathematical model,the solution analysis is performed: firstly,the complexity of the model is analyzed,then the small-scale problem is solved accurately;then,for large-scale problems,various approximate greedy algorithms are proposed,and the results of total cost of tool change under different greedy steps has been compared;Thirdly,based on the actual needs of a company,a simulation model was built for an automatic production line including turning and milling machining center.The optimization method proposed in this paper was applied in the simulation model to calculate.The tool configuration method of the machining center tool magazine proposed in this paper can effectively reduce the tool-change time cost for an automatic production line or a flexible processing unit that generally includes multiple machining centers and faces multiple types of task transformation.