Second, based on case-based reasoning high-speed machining database construction technology CBR (Case-Based Reasoning) originated in the 1970s and is a kind of reasoning model that emerged during the development of artificial intelligence technology. To put it simply, it is to solve the new problem by using solutions and knowledge of similar problems in the past. Case-based reasoning is a kind of reasoning method widely used in various problem solving fields. Applying this reasoning method to solve problems does not depend on the rules of the problem domain, but relies on previous accumulated experience and similar examples of successful solutions. . This is very close to the ideas and methods of human experts to solve problems. In fact, the case-based reasoning technique is a problem solving method that can be applied to many fields. In the field of high-speed machining of automotive molds, there are many factors to consider in solving problems. Some parts of the solution can be determined by simple rules, but in most cases, the actual situation should be noted. If a cutting tool is selected, the tool type can be easily determined using rules, but the determination of data such as tool size, geometry, blade type, size, angle, machining parameters, etc., is difficult to determine with simple and effective rules. Sometimes, using certain rules that already exist may even lead to erroneous conclusions. In this case, the application of rule-based reasoning is greatly limited. It is difficult to deal with non-numeric data in the problem domain by using artificial neural network algorithm, and applying case-based reasoning technology to solve such problems It is easy to overcome the above difficulties. In addition, due to the lack of accumulated experience, the optimal matching of parts and tool materials, the selection of cutting amount, the selection of cutting fluid, the rigidity of the machine tool and the rigidity of the workpiece on the machining accuracy and surface quality, and the cutting method are The choice of machine tool, the reasonable matching between tool life and cutting amount and processing cost, and the influence of parts and machining surface types on the process plan cannot be expressed by simple formulas or rules. And this information and experience is significant for the promotion of high-speed cutting technology, so how to collect and process is very important. The method of solving problems based on case-based reasoning can just use the above experience and processing examples to solve various problems in the high-speed machining process. In the current high-speed machining field lacking a large number of systematic applicable cutting data, experience and rules, the application of case-based reasoning technology to solve problems can provide a practical and feasible way to establish a high-speed cutting database and promote high-speed cutting technology. way. Technical route of automotive mold high speed cutting technology The high-speed cutting database construction technology based on finite element simulation technology and case-based reasoning is used to study the supporting technology, and theoretical analysis and experimental research are used as auxiliary technologies to carry out in-depth research on the high-speed cutting process of automobile molds, especially the cover parts. The research process is as follows: firstly, the mechanical properties test of materials is carried out, and the finite element model is constructed by using experimental data. The mechanism of high-speed machining is discussed, the parameters of high-speed machining are optimized and the laws of high-speed machining are revealed. The source data of machining parameters and the law of high-speed machining are optimized. The high-speed cutting database was established by using case-based reasoning method. The high-speed cutting strategy of automobile cover mould with complex surface features to maintain approximate constant cutting load was studied. The key application technology of 3+2 axis CNC machining method was broken, and the car cover mould 3+2 axis CNC was developed. Auxiliary programming tools are used to finally apply these results to actual high-speed machining. Application examples of high speed cutting technology for automotive molds Dongfeng Auto Mould Co., Ltd. is one of the largest and most technologically advanced companies in the domestic automotive mold industry. Since 2000, the company has organized technicians to carry out research on high-speed machining technology, closely combined with the actuality of automobile molds, especially the manufacture of cover molds, to solve a series of key technologies, and summarized a set of high-speed machining for automobile cover parts. Technical solutions and methods, including: the basic concept of high-speed machining of automotive panel molds; the selection of high-speed machining equipment; the installation and commissioning of high-speed machining tools; the use of high-speed cutting tools; CAM software suitable for high-speed machining; 3+2†axis high-speed machining technology; high-speed machining technology and measurement technology. In the past two years, it has jointly carried out the optimization of process parameters and database system development and application projects for automobile molds with Zhejiang University and Hubei Automotive Industry Institute. This project takes the high-speed finishing of the complex profile of large automobile cover parts as the main research object. Based on the introduction of foreign large-scale high-speed CNC machining center equipment, the combination of metal cutting finite element simulation and experimental technology is used to study the common molds. The high-speed machining mechanism of materials; the high-speed cutting database of automobile molds with self-learning function was established based on the case-based reasoning method; the tool axis inclination optimization tool was developed in close cooperation with the UG CAM software function, so the complex profile of the automobile cover mould was “ When the 3+2 axis is machined, it meets the processing requirements of high speed, high quality and high reliability of automotive molds. After practical application, good application results have been achieved. Previous page
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