Automatic identification method for injection forming process period
An automatic identification and injection molding technology, applied in the field of injection molding machine data acquisition system, can solve the problems of low precision, poor processing effect, poor applicability, etc., and achieve the effect of high precision and stable operation
Active Publication Date: 2014-03-12
HUAZHONG UNIV OF SCI & TECH
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[0005] At present, some scholars use filtering algorithms that are more suitable for processing travel curves, such as: recursive average filtering method, median value average filtering method, first-order lag filtering method, weighted recursive average filtering method, etc. to try to eliminate the influence of fluctuations on period recognition. Influence, see Liu Jinfan "Research on Key Technology of Intelligent Setting System of Injection Machine Process Parameters" Huazhong University of Science and Technology, 2009 [Master's Dissertation]; however, these filtering methods have low precision, poor processing effect and poor applicability in actual use. And other shortcomings, making the recognition cycle and the actual value are quite different
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[0023] The present invention uses a series of polylines to approach the travel curve under the criterion of the area limit value, and on this basis uses the angle limit value to determine the inflection point of the travel curve, and then determines the process cycle. The area limit value fArea is used to limit the extent of the polyline approaching the data curve. The smaller the fArea, the more accurate the approximation. Conversely, the larger the fArea, the rougher the approximation. The angle limit value fAngle is used to limit the size of the absolute value Δα of the angle difference between the previous polyline and the subsequent polyline. The determination method of the area limit value fArea and the angle limit value fAngle is as follows: first, the area limit value fArea and the angle limit value fAngle are initialized arbitrarily many times, and then the cycle is determined by the present invention, and the accuracy analysis is performed on the result to see whether...
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The invention discloses an automatic identification method for an injection forming process period. The method comprises the following steps of: searching a key point in a process period in two stages; performing linear approximation processing on a travel curve by taking an area limit value as a reference; approaching the travel curve with a series of polyline segments; identifying an inflection point according to azimuth difference of two adjacent polyline segments and an angle limit value based on the linear approximation; and finally analyzing the travel value of each inflection point to determine the process period according to an injection molding process. Due to the adoption of the method, the process period of an injection molding machine can be accurately determined according to data acquired by a data acquisition system of the injection molding machine; and compared with a conventional filtering method, the method has the advantages of high accuracy and more stable operation and thus lays a solid foundation for subsequent statistical analysis of the data acquired by the injection molding machine.
Description
technical field [0001] The invention belongs to the field of injection molding machine data acquisition systems, and in particular relates to a method for automatically identifying the process cycle of the injection molding machine through the data acquisition system during the working process of the injection molding machine. Background technique [0002] Injection molding machine is a machine that injects molten plastic into a molding mold to make plastic products. As an important plastic molding machine, it has made great contributions to the development of the plastics industry. The performance parameters (such as injection pressure, speed, temperature, etc.) of the injection molding machine directly determine the molding quality of the plastic parts it produces. Accurately obtain the characteristics of the operating parameters of the injection molding machine, on this basis to optimize the forming process to improve product quality is particularly necessary. [0003] A...
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IPC IPC(8): B29C45/76
Inventor 崔树标赵朋张云黄志高徐凯陈晓磊
Owner HUAZHONG UNIV OF SCI & TECH