Barrel temperature control method of injection molding machine

A barrel temperature and control method technology, applied in the field of temperature control, can solve problems such as shortening the time spent, reducing the overshoot of the temperature, and unable to obtain PID.

Active Publication Date: 2015-09-09
HUAZHONG UNIV OF SCI & TECH
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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 obtai

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  • Barrel temperature control method of injection molding machine
  • Barrel temperature control method of injection molding machine
  • Barrel temperature control method of injection molding machine

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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0039] figure 1 It is the schematic diagram of the fuzzy PID controller for the barrel temperature of the injection molding machine in the embodiment of the present invention. It introduces temperature deviation e and temperature deviation change rate e c Carry out fuzzy reasoning, and constantly revise the fuzzy rules, realize the self-adaptation of fuzzy rules, improve the accuracy of the th...

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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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Application Information

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IPC IPC(8): B29C45/78
CPCB29C45/78B29C2945/7604B29C2945/7619
Inventor 周华民张云黄志高李德群罗帆阮宇飞高煌周循道
Owner HUAZHONG UNIV OF SCI & TECH
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