Injection mold measuring and control instrument

Abstract

The invention discloses an injection mold measuring and control instrument, and belongs to the field of automatic control of injection molding. The problem that actual molding parameters are deviatedfrom set values which is caused by different machine tool configurations is solved, the quality of products is accurately controlled, and a data foundation is provided for defective product screeningof automatic production. The mold forming measuring and control instrument comprises a universal recorder and a data communication module. The universal recorder periodically records data, and forms apressure-time curve and a temperature-time curve over time. Data recorded by a central processing module in a mold trial process and parameters stored in the mold forming measuring and control instrument are sent to a remote through a host computer (PC or a human-machine interface) connected through a data communication module or satellite positioning and a mobile data network, remote control andthe Internet of Things are achieved, through sent control signals, defective products are screened out through manipulators, and automated production is achieved.

Description

technical field [0001] The invention relates to a measurement and control system and a measurement and control method for the molding process of injection molds, in particular to the quality control of product molding states in the development process of injection molding molds. Background technique [0002] The control of product quality requirements in the production process of injection molds mostly depends on the negative feedback of the screw pressure of the injection molding machine and the familiarity of the quality personnel with the product, and there is no specific and direct measurement and control of the impact on mold molding after adjusting the injection parameters. The injection process is a dynamic cycle process that can be divided into several stages. The injection cycle starts (the internal pressure of the barrel increases and the screw moves forward) → the melt is injected into the cavity → the cavity is filled (the cavity pressure increases , the filling ...

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Problems solved by technology

[0002] The control of product quality requirements in the production process of injection molds mostly depends on the negative feedback of the screw pressure of the injection molding machine and the familiarity of the quality personnel with the product, and there is no specific and direct measurement and control of the impact on mold molding after adjusting the injection parameters. The injection process is a dynamic cycle process that can be divided into several stages. The injection cycle starts (the internal pressure of the barrel increases and the screw moves forward) → the melt is injected into the cavity → the cavity is filled (the cavity pressure increases , the filling pressure depends on the melt flow resistance)→full filling→extruding the melt (compressing the melt to ensure complete filling)→holding pressure (the melt no longer flows into or out of the cavity)→stabilization (the injection part begins to cool and shrink , size setting), the above process forms different pressure-time function curves at different points in the cavity; the current plastic mold cannot perceive the above parameters in the cavity because there is no induction device, and the injection parts are usually adjusted according to the experience of personnel. Adjust the process parameters, test repeatedly and determine the injection process. This is based on the fact that the injection equipment is accurate and the mold temperature does not change at all. In fact, it is impossible to achieve. Any slight changes in the equipment and molds during the production process will be reflected. In terms of products, defective products often appear in the production process; the pressure in the mold cavity is the only real parameter that reflects the essential characteristics of the injection process, and the mold temperature is also one of the factors affecting the fluidity of the plastic. The multi-point pressure-time curve and mold cavity temperature-time curve data are collected and output to the central processing module. The central processing module compares the timely collected data with the set curve to determine the possibility of defective products. Realize automatic detection in the production process, so as to realize the screening of defective products;

[0003] Through the understanding of the above-mentioned injection mold production process, we are convinced that the measurement and control of the internal pressure and temperature of the mold is necessary for automatic production, and the existing fluid pressure and temperature measurement and control cannot be installed in the mold cavity with a relatively small space, and there is no The control software that can be matched with it can realize real-time monitoring of the molding parameters inside the cavity, let alone large-capacity data comparison;

[0004] Foreign developed countries have also made many attempts in this regard, but the accuracy and reliability cannot meet the requirements of the existing cavity mold development, and the cost is high and the interchangeability is poor. The single-piece and small-batch characteristics of cavity mold development itself urgently need a A mold injection molding measurement and control method that can adapt to the measurement and control of most mold cavities. Only by connecting with a PC can we further realize networked remote interaction

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