Control Algorithm And Simulation, Automatic Pouring System

Casting is a very important technique in modern casting. China is a big country for casting, all this kind of companies want to be successful in the hotly compete market, so the request to the cast is higher and higher, but there are many factors influence and restrict the improvement of the products. There are many factories still stay in the period of using workers to pouring, the result is that the quality is good, but the efficiency is low. The writer analyzed and studied the pouring system, found the key factor which influence the casts' quality is the fluid-station in the pouring cup. It is too higher, will make the molten metal overflow and destroy the whole common manufacturing process; or it is too lower, will make inferior products.The pouring system is a complex object to be controlled, which has the character of non-linear, occasional and ashen. Although simple control method can realize the auto-pouring, it has some shortcomings, that is, with the declining of molten iron level in pouring bag, it can' t response automatically to the change of the parameters of the controlled object, and need seasoned workers to adjust these parameters online, which is possible to reach the technical request. Compare the result with the seasoned workers' , the quality is very different, and if the workers are different and changing, the operational knowledge will be lost. So it' s necessary to in-troduce some new control method in the pouring system, in order to reach the technical request and impulse the development of the casting manufacturing in our country.This thesis is developed on an existing problem for the control of molten iron level in the casting system. The level of the pouring cup is the core in the casting procession; like what we said, the control will influence the quality and output of the production directly. It is very difficult to realize the control request if we just use traditional control methods. Base on the analyze and study, the writer constantly operate in the factory and communicate with the seasoned workers, collect a lot of operational knowledge, provide a fuzzy control based on the present existing problems inthe casting system, and combine the two control method to a new way to resolve the problem better, which realize the technical request.During designing the fuzzy control, the writer found the subject function, control rule, and adjusting-gene play very important roles to the capability of the controller, constantly correct these factors, emendate the controller which has been designed; chose the best factors which suit to the pouring system. Summarize the advantage and disadvantage in the traditional control and the fuzzy control, the writer design a new one which is a kind of controller can self-adjust parameters. At last, emulation proved that this control method has reached the respected control effect.