Temperature control system and method for injection mold

Abstract

The invention relates to the field of injection mold control, and specifically discloses a temperature control system and method for an injection mold. The method comprises the following steps of acquiring actual temperature values of a mold cavity and room temperature; acquiring the duty ratio of PWM (Pulse Width Modulation) waves by an adaptive PID (Proportion Integration Differentiation) algorithm according to the actual temperature value when a mold cavity temperature value error exceeds a preset error range, and generating a control command; adjusting the on / off time according to the control command; and heating the injection mold according to the on / off time. According to the temperature control system and method, the output of a main control module is accurately adjusted by the PIDalgorithm according to the actual temperature values of the mold cavity and the room temperature, so that the temperature control of the mold cavity is stable. Meanwhile, the mold cavity is heated andcooled rapidly by controlling the on / off time of the heating device, so that the mold machining is more accurate and efficient. Moreover, temperature compensation is added for eliminating the influence of room temperature at a non-working end of a thermocouple on the detection, so that the temperature detection is more accurate.

Description

technical field [0001] The invention relates to the field of injection mold control, in particular to a temperature control system and method for injection molds. Background technique [0002] Mold is known as the "mother of industry" and is the cornerstone of industrial manufacturing. In modern life, plastic parts are indispensable components for various daily necessities and electronic equipment. With the increasingly sophisticated product technology and consumer With the improvement of aesthetic vision, the requirements for the plastic parts used are getting higher and higher, which are specifically reflected in the high requirements for the appearance, dimensional accuracy, and deformation of the products. A well-made mold is crucial for the later production of products. important. In the mold trial link of the injection mold production process, the influence of the mold temperature factor on the production specifications is extremely obvious, especially the influence o...

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Problems solved by technology

[0003] When the cavity temperature is high, it is conducive to plastic flow filling, and the surface effect of the product is good, but too high cavity temperature will cause the deformation of the part after demoulding, which requires a longer cooling time to overcome it, thus reducing production efficiency. ;If the temperature of the cavity is low, it is not conducive to the flow and filling of plastic, and it is easy to cause the product to lack glue or the surface welding marks are obvious; moreover, the change of the cavity temperature will easily cause the consistency of the product to deteriorate, and the dimensional accuracy of the product is difficult to guarantee. The temperature in the mold cavity needs to go through a process of first rising and then stabilizing and then falling. If the temperature control is not in place, the quality of the product produced by the mold will be difficult to guarantee

At present, most of the temperature control methods used in the field of injection mold production have problems such as slow temperature rise and fall, temperature jumps, and unstable temperature control.

And in the actual production process, the ambient temperature will affect the actual measured temperature of the non-working end of the temperature collector, thus causing an irreparable impact on the overall temperature collection, resulting in the unsatisfactory actual experience of temperature control of most existing injection molds

[0004] In the prior art, such as the Chinese patent with the publication number CN108943594A, a cavity temperature-controllable injection mold is disclosed, which mainly discloses that the temperature control is controlled by monitoring whether the cavity temperature exceeds the threshold value. , but it does not add the influence of indoor temperature on production into the control amount, the actual temperature control is not accurate, and only depends on the threshold value judgment, the actual temperature control is not stable, and it is easy to cause up and down jumps; another example is the public number is The Chinese patent of CN106180640B discloses a multi-chamber temperature control system and method of a die-casting mold, which achieves the purpose of multi-chamber temperature control by monitoring and regulating the temperature of the multi-chamber, but it does not take into account Influence of the ambient temperature outside the mold on the accuracy of temperature acquisition

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