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Method for detecting die cavity pressure in injection molding process based on ultrasonic signals

A technology of cavity pressure and injection process, used in the field of plastic injection molding

Inactive Publication Date: 2012-07-25
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a Gaussian soft measurement method for the melt pressure in the mold cavity based on ultrasonic signals in view of the shortcomings of the existing method for detecting the melt pressure in the mold cavity

Method used

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  • Method for detecting die cavity pressure in injection molding process based on ultrasonic signals
  • Method for detecting die cavity pressure in injection molding process based on ultrasonic signals
  • Method for detecting die cavity pressure in injection molding process based on ultrasonic signals

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Embodiment

[0101] In this embodiment, polyvinyl chloride (PVC) is selected as the injection material, such as figure 1 As shown, the implementation steps of the Gaussian soft measurement method for cavity pressure in the plastic injection process based on ultrasonic signals in this example are as follows:

[0102] 1. Acquisition of ultrasonic echo signals between the cavity wall and the melt:

[0103] The method uses ultrasonic signals to detect the density of the melt in the mold cavity, and then establishes the relationship between the melt temperature, density and pressure through the PVT characteristics of the melt and the Gaussian soft sensor model, and realizes real-time online measurement of the pressure. For this reason, this method builds an ultrasonic detection platform for the cavity pressure. The positional relationship between the cavity, melt and ultrasonic sensors in this system is as follows: figure 2 shown. An ultrasonic probe with a frequency of 5 MHz is fixed on th...

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Abstract

The invention discloses a method for detecting die cavity pressure in an injection molding process based on ultrasonic signals. The method includes the steps: firstly, acquiring ultrasonic echo signals, die temperature and injection cylinder pressure between the wall of a die cavity and a melt interface in the injection molding process; secondly, building a Gaussian process measuring model based on the Bayesian information criterion, using data acquired in the first step as training data, inputting the ultrasonic echo signals, the die temperature and the injection cylinder pressure to the model, outputting melt pressure in the die cavity from the model and optimizing the model by the aid of a minimal negative boundary likelihood function logarithm method after building the model; and finally, writing the optimized Gaussian process measuring model into an injection molding equipment controller in the form of C language and realizing real-time online soft measuring for the die cavity pressure. The method can be used for realizing online soft measuring for the melt pressure in the die cavity in the injection molding process, and has the advantages of low cost and convenience in use.

Description

technical field [0001] The invention relates to the field of plastic injection molding, in particular to an online soft measurement method and device for melt pressure in a mold cavity during the injection molding process. Background technique [0002] Plastics are synthetic high molecular compounds, also known as polymers. Most plastics are light in weight, stable in chemical properties, will not rust, have good impact resistance, good insulation, low thermal conductivity, and can be molded at one time. Plastics are widely used in various industries such as medical treatment, automobiles, and electronics due to their excellent performance and easy processing and molding. The processing and molding methods of plastic products mainly include compression molding, extrusion molding, injection molding and hollow molding, among which injection molding is the main processing method of plastics. In China, injection molding equipment (Injection Molding Machine) accounts for 40% of...

Claims

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Application Information

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IPC IPC(8): B29C45/77
Inventor 王硕应济蔡侃孙明涛
Owner ZHEJIANG UNIV
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