Barrel temperature control method of injection molding machine

Abstract

The invention discloses a barrel temperature control method of an injection molding machine. The method comprises the following steps: S1, a fuzzy value E of temperature deviation between measured temperature and target temperature in a current sampling period k and a fuzzy value EC of temperature deviation variation rate between the measured temperature in the current sampling period and measured temperature in the last sampling period are calculated; S2, PID fuzzy reasoning operation of the current sampling period is carried out, and fuzzy rule of the current sampling period during the operation is corrected; S3, PID controlled quantities of the current sampling period are calculated, and current heating control is carried out according to the controlled quantities of the current sampling period; and S4, the Steps S1 to S3 are repeated successively in the next sampling period (k+1). The fuzzy rule is corrected continuously by the method, and three quantities of PID are obtained according to the corrected fuzzy rule. Control precision can be raised, temperature overshoot can be effectively reduced, and time spend in heating to a specified temperature can be shortened.

Description

technical field [0001] The invention belongs to the related field of temperature control, and more specifically relates to a method for controlling the temperature of a barrel of an injection molding machine. Background technique [0002] The temperature of the barrel of the injection molding machine is an important parameter in the injection molding process. Effective control of the barrel heating temperature is an important link to ensure the molding quality of plastic products. During heating, the temperature of the barrel affects the rheological properties of the molten plastic. If the melt temperature is too high, it is easy to cause quality defects such as warping and burning; if the melt temperature is too low, the degree of plasticization of the plastic is uneven, and the flow performance decreases, which is not conducive to the melt injection filling the mold cavity, and it is easy to form short shots, flow Quality defects such as scratches. Accurate temperature c...

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Problems solved by technology

[0010] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for controlling the temperature of the barrel of an injection molding machine, the purpose of which is to dynamically adjust the fuzzy rules according to the actual temperature of the barrel of the injection molding machine, and continuously adjust the fuzzy rules. The correction, and according to the modified fuzzy rules to obtain the three control quantities of the PID, and then according to the three control quantities for heating control, can reduce the temperature overshoot, shorten the time spent heating to the specified temperature, thus solving the existing technology In the process, the fuzzy rules cannot be adjusted in real time according to the temperature change of the barrel, resulting in the problem that a more ideal PID control output cannot be obtained

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