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Method for quickly and accurately positioning die in injection molding process

A precise positioning and mold technology, which can be used in the injection molding process to quickly and accurately locate the mold, solve the problems of unusable track error, difficult to achieve mold positioning, and inability to use well, and achieve shortened time, shortened time, The effect of reducing vibration damage

Inactive Publication Date: 2011-04-20
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This non-linearity makes traditional control methods not well used
Therefore, in the injection molding industry, fast and accurate mold positioning is difficult to achieve
[0005] In addition, ILC is usually applied to linear models, and nonlinear systems can only produce small track errors and cannot use this method
[0006] The current mold positioning method in the injection molding process, either does not use ILC control, or only controls the mold deviation through the outer layer ILE, which cannot achieve the purpose of fast and accurate positioning

Method used

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  • Method for quickly and accurately positioning die in injection molding process
  • Method for quickly and accurately positioning die in injection molding process
  • Method for quickly and accurately positioning die in injection molding process

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Embodiment Construction

[0050] Such as figure 1 As shown, in the process of the Kth cycle, the reference speed V of the mold at the moment (t+d) k (t+d) and the speed V at the moment (t+d) in the last cycle K-1 stored in memory 1 k-1 (t+d) Through the calculator, compare and get V k (t+d)-V k-1 (t+d), V k (t+d)-V k-1 (t+d) Through the learning of the controller C, the input signal Kp*V is obtained k (t+d)-V k-1( t+d), where Kp is the learning rate of the controller, and the input signal is compared with the speed V of the mold at time t in the previous cycle stored in the memory 1 k-1 (t) Through addition, the input signal is obtained, that is, the speed u of the valve at the time of the K-th cycle t k (t), on the one hand, this input signal will be stored in the memory 1 for the next cycle of learning, on the other hand, it will control the process 1 to obtain the output signal V k (t), that is, the speed of the mold at the time t of the K cycle. Repeat learning in this way until the output...

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Abstract

The invention relates to a method for quickly and accurately positioning a die in injection molding process. In the invention, based on closed-loop control, the iterative learning control (ILC) over speed is adopted on an inner layer and iterative learning estimator is used to estimate offset on the outer layer, so as to ensure a smooth die opening process and realize the quick and accurate positioning of the die; therefore, the production period is shortened and mechanical vibration damage is reduced.

Description

technical field [0001] The invention relates to a method for quickly and accurately positioning a mold during the mold opening stage of the injection molding process. Under the condition of closed-loop control, the method uses ILC (Iterative Learning Control, Iteratvie Learning Control) inner layer to control the speed, combined with the outer layer ILE (Iterative Learning Estimator, Iteratvie Learning Estimator) to evaluate the deviation, and quickly and accurately locate the mold. Background technique [0002] The injection molding process mainly includes five stages: mold closing, injection, pressure holding, cooling and plasticizing, and mold opening. There are two aspects to the impact of mold opening on the entire injection molding process. On the one hand, accurate mold positioning can ensure the continuous production process. sex. For example, when using a manipulator to take out a plastic product from a mold, the movable mold must stop at a precise position to ensu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/80
Inventor 高福荣杨毅
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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