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Model-free weight controlling method for injection molding product

A technology of injection molding and control method, which is applied in the field of model-free control of injection molding product weight, and can solve problems such as low efficiency, sensitivity to noise and interference, and inability to implement

Inactive Publication Date: 2011-06-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(Nelder, J. A.; Mead, R., A Simplex-Method for Function Minimization. Computer Journal 1965, 7, (4), 308-313.) The advantage of this method is that the search process does not depend on the gradient information of the iteration point, but only Function value information is required; therefore, the implementation is convenient and the efficiency is high; however, this method is sensitive to noise and interference, and in the presence of noise and interference, the efficiency is low and even the algorithm stagnates; it cannot be directly controlled by the model-free implementation in process

Method used

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  • Model-free weight controlling method for injection molding product
  • Model-free weight controlling method for injection molding product
  • Model-free weight controlling method for injection molding product

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Experimental program
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Embodiment

[0055] The following uses the weight control of a plastic magnifying glass handle as an example to illustrate the implementation process of a model-free weight control method for injection molded products proposed by the present invention.

[0056] First, enter step (1) to initialize the method; the weight control target of the product =6.5 grams, according to the weight fluctuation of the product, set the weight deviation tolerance Grams, Weight Fluctuation Variance Tolerance grams, number of repetitions , the number of repeated measurements , the number of validation trials , the maximum number of trials , the coefficients of the simplex algorithm ; The optimized process parameters are: injection pressure, holding pressure and holding time, in which the injection section is divided into one section and two sections to be controlled respectively, and the subsection point is also a key process parameter. In this way, a total of 5 process parameters need to be adj...

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Abstract

The invention discloses a model-free weight controlling method for an injection molding product. In order to solve the problems of frequent operation parameter variation, difficult process modeling and finite model precision and the like during injection molding production, model-free quick product weight control is realized by using the characteristics of low cost and repeated batches of the injection molding production. The method is favorable for reducing the test expenses of a product weight control process and shortening the control time; moreover, the method has significance for improving the weight control efficiency during injection molding and achieving the effects of energy saving and emission reduction during injection molding industrial production.

Description

technical field [0001] The invention relates to the field of weight control of injection molded products, in particular to a model-free control method for the weight of injection molded products. Background technique [0002] Injection molding is a common and important plastic processing method. The weight of molded products is an important quality performance index of injection molded products. The weight control of injection molded products is of great significance to the quality control of products. However, the injection molding process is a complex, multi-stage, multi-variable and non-linear batch production process. There are many factors that affect the weight of injection molded products. At the same time, there are uncertain factors such as noise in the actual production process, which makes it difficult to realize the weight control of injection molded products and the cost is high. [0003] From the perspective of product quality control, currently in the field...

Claims

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Application Information

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IPC IPC(8): B29C45/76
Inventor 陈曦孔祥松邵之江王喆
Owner ZHEJIANG UNIV
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