The next development goal of intelligent nc machine tools
1. Establishment of expert system
Expert system is an intelligent accounting machine program system, which contains a lot of knowledge and experience of a certain category of experts, and can use human experts' common sense and processing methods to deal with the category of questions. Also that said, the expert system is a has a lot of specialized knowledge and experience of application system, it USES the artificial intelligence technology and accounting machine technology, according to the supply of a certain category of one or more experts knowledge and experience, reasoning and judging, mimic human expert decision-making process, in order to deal with the demand of human experts to deal with complex question. At present, the scope of CNC machine tools is missing is the establishment of this expert system.
On the intelligent development of CNC machine tools, the establishment of the expert system is very necessary, no matter from the fault diagnosis is still the machine running aspects are very meaningful. The emphasis of the expert system is to set up the common sense database, which is used to store the common sense provided by experts. The question solving process of expert system imitates the thought and method of experts through the common sense in the common sense database. Therefore, the common sense database is the key to whether the quality of expert system is superior, that is, the quality and quantity of common sense in the common sense database determines the quality level of expert system. Generally speaking, the knowledge base in the expert system and the program of the expert system are independent of each other, and users can advance the function of the expert system by changing and perfecting the content of the knowledge base.
Common sense in artificial intelligence indicates that the methods include occurrence, framework, semantic network, etc., while common sense in expert system is occurrence rules. Occurrence rule with IF... THEN... IF is followed by a condition (antecedent), THEN by a conclusion (antecedent), both of which can be combined by logical operations such as AND, OR, AND NOT. Here, the understanding of the occurrence rules is very simple: if the preconditions are met, the corresponding action or conclusion occurs.
2. Artificial neural network
Currently, nothing is more intelligent than the human brain, and an artificial neural network is a mathematical model that USES structures similar to the synapses of the brain to process information. The development trend of intelligent CNC machine tools should also be carried out in the direction of artificial neural network.
A neural network is an operational model consisting of many nodes (or neurons) connected to each other. Each node represents a specific output function called an ActivationFunction. The connection between each node represents a weighted value of the signal passing through the connection, called the weight, which is equivalent to the recall of the artificial neural network. The output of the network varies according to the connection method, weight value and excitation function of the network. However, the network itself is generally the imminent arrival of some natural algorithm or function, or the expression of a logical strategy. If this is used in the control of CNC system, the development of CNC machine tools will be a rapid advance. ,
The characteristics and advantages of artificial neural network are mainly manifested in three aspects:
(1) with self-learning function. For example, when picture recognition is completed, many different picture templates and corresponding results that should be recognized are first input into the artificial neural network, and the network will learn to recognize similar pictures gradually through self-learning function. The function of self-learning has particularly important implications for guessing.
(2) associative storage function. This association can be accomplished by using the response network of the artificial neural network.
(3) have the ability to search for optimal solutions at high speed. Searching for the optimal solution of a complex question usually requires a large amount of accounting. Using a reactive artificial neural network to plan for a certain question to show the high speed calculation ability of the accounting machine may quickly find the optimal solution.
With the advance of science and technology, CNC machine tools are constantly carried out, it not only extends the physical strength of the people, but also gradually replace the question of mental labor, including independent process planning, work fixtures, production control and protection management, machine tools will become more and more "smart" and human nature. Sheng general notice metal processing online reporters, in the future direction should be carried out in the following three technical directions: first, from the single factor of the bondage of intelligent control to the process of inductive elements of the optimization of intelligent control; Secondly, processing information and technical information offline intelligent to process online real-time intelligent control; Then by the program has not finalized the intelligent control to independent association intelligent development. There may be more research to be done, but the speed of forward computation does not seem to be sufficient to deal with it. In addition, the sensor with small and reliable activation is also an important condition for the development of intelligent entity technology.
In the future factory, CNC machine tool is not just a processing equipment, but a node in the factory processing network, with a more extensive man-machine interaction, object-object communication function, and then the founding of a new era of CNC technology.
