A method for online quality detection of injection molding process

A quality inspection method and quality technology, applied in the field of injection molding, can solve problems such as inability to effectively ensure product quality, lack of online quality inspection methods, etc., and achieve the effect of reducing impact, wide adaptability, and high flexibility

Active Publication Date: 2017-10-31
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Description
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  • Application Information

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Problems solved by technology

However, due to the lack of effective online quality detection methods, the current quality control of the injection molding process can only be achieved indirectly by controlling process variables such as temperature, pressure, and displacement.
However, indirect quality control methods cannot effectively guarantee product quality in the actual production process.

Method used

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  • A method for online quality detection of injection molding process
  • A method for online quality detection of injection molding process
  • A method for online quality detection of injection molding process

Examples

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Effect test

no. 1 example

[0056] This embodiment mainly introduces the point electrode capacitance sensor.

[0057] In order to meet the needs of online measurement of flat-shaped products (such as mobile phone casings), some people have designed and processed flat-type capacitive sensors, but flat-type capacitors cannot be installed in plastic product molds with complex cavity surface structures. Based on this requirement, the present invention designs a novel point electrode capacitive sensor to solve the problem of online measurement of plastic products with complex surfaces.

[0058] The point electrode capacitive sensor of the present invention can not only play the role of a flat capacitive sensor in the form of an array, but also can be rationally arranged in a mold with a non-planar surface structure, and has wider applicability. The pole plate of the point electrode capacitive sensor of the present invention is designed as a single point shape (generally 3~6mm round), which can be respectively...

no. 2 example

[0069] The injection molding process has the typical characteristics of a batch process: multi-session, repeatability and variability of working conditions. Based on the point electrode capacitive sensor in the first embodiment, this embodiment proposes an online quality detection method of the injection molding process using the three characteristics of the batch process, and introduces a three-dimensional time model for quality detection control for the first time. The three-dimensional time model is divided into multi-period sensor detection modeling (on the one-dimensional time axis), detection signal processing along the period direction (on the two-dimensional batch axis), and rapid transplantation of the detection model after the working condition changes (on the three-dimensional Working condition axis) these three parts. The detection method proposed by the invention can detect the flow position and speed of the polymer material melt in the mold cavity in the injectio...

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Abstract

The invention discloses an online quality detection method for an injection molding process. The online quality detection method for the injection molding process includes the steps that a three-dimensional time model for online quality detection of the injection molding process is established, and three-dimensional coordinates of the three-dimensional time model include cycles, time and working conditions; multi-period sensor detection is carried out according to the established model, and sensor signals of all stages of the injection molding process are obtained; digital signal processing is carried out on the obtained sensor signals in the cycle direction, and preliminary online quality detection data are obtained; and the preliminary online quality detection data are rectified according to changed working conditions, and final online quality detection data are obtained. According to the online quality detection method for the injection molding process, multi-period performance, repeatability and variability of the working conditions of the injection molding process are considered comprehensively, the three-dimensional time model based on the time, the cycles and the working conditions of batch processes is used for carrying out detection, the working conditions are introduced into the injection molding process model for the first time, and online quality detection of the injection molding process is achieved more effectively, comprehensively and accurately. The online quality detection method for the injection molding process can be widely applied to the technical field of injection molding.

Description

technical field [0001] The invention relates to the technical field of injection molding, in particular to an online quality detection method in the injection molding process. Background technique [0002] The injection molding process is a complex industrial manufacturing process, and the quality of injection molded products depends on material parameters, machine parameters, process parameters and the interaction of these parameters. Maintaining a good and stable molding process is a necessary condition for obtaining high-quality products, and to achieve this condition must be based on precise quality control of the injection molding process. However, due to the lack of effective online quality detection methods, the current quality control of the injection molding process can only be achieved indirectly by controlling process variables such as temperature, pressure, and displacement. However, indirect quality control methods cannot effectively guarantee product quality i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/76B29C45/77
CPCB29C45/76B29C45/77
Inventor 莫胜勇姚科高福荣
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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