Calculating method of plastic injection moulding technological window

Abstract

The invention provides a calculating method of a plastic injection moulding technological window. The method comprises the following steps: selecting types of technological parameters, determining factors of an orthogonal test, determining the level of each factor according to the value range of the technological parameters, and selecting an orthogonal table according to the numbers of factors and levels; calculating pressure distribution, melt temperature distribution and shearing speed distribution of a product in a moulding process, and calculating the inlet maximum pressure, the melt maximum temperature difference and the maximum shearing speed; evaluating each technological parameter combination in the orthogonal table in the second step according to the calculating result to establish quality evaluation of the product; training a training sample by a support vector sorting machine according to the quality evaluation of the product to calculate an optimal solution and a threshold value; and constructing a discriminant according to the training sample, the optimal solution and the threshold value to describe the technological window of selected parameters. The method provided by the invention is free from comprehensive tests, the calculated amount of numerical simulation is less, and the high-dimensional non-linear technological window can be directly described through a discrimination function.

Description

technical field [0001] The invention belongs to the technical field of plastic injection molding, and more specifically relates to a calculation method for a process window of plastic injection molding. Background technique [0002] In the injection molding process, the process parameters of melt temperature, mold temperature, VP switching position, injection rate, holding pressure, and holding time are the main factors that determine the quality of plastic injection molding products. Its setting mainly depends on the experience and level of the craftsman at present. However, due to the wide variety of plastic materials and various mold structures, it is difficult to set manual process parameters, low production efficiency, low yield, poor repeatability, and difficult to guarantee quality. [0003] Injection molding process parameters need to have strong robustness in actual production to ensure the stable production of products. Due to the differences in the power, struct...

AI Technical Summary

Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a calculation method for the process window of plastic injection molding, which overcomes the problems of high dimensionality and nonlinearity of the process window, difficulty in description and large amount of calculation in the prior art

Images