Piezoelectric dynamic plasticizing forming device and injection molding method thereof

Abstract

The invention discloses a piezoelectric dynamic plasticizing forming device and an injection molding method thereof. The forming device is characterized in that: the forming device comprises, sequentially connected from front to back, a nozzle, a nozzle seat, a material tube, a compression screw, a piezoelectric ceramic driving system, a hydraulic cylinder, and a hydraulic motor; the material tube is provided with a heating jacket, and the hydraulic cylinder and the hydraulic motor are connected with a hydraulic pump; the nozzle seat is connected to the front end of the material tube, and the nozzle is connected to the nozzle seat; the compression screw is positioned in the space of the material tube, and the back end of the piston rod, which extrudes the material tube, is connected with the front end of a piezoelectric ceramic; the back end of the piezoelectric ceramic is connected with a piston rod, two ends of the piston rod extrude the hydraulic cylinder, and the back end of the piston rod is fixedly connected with the hydraulic motor. The injection molding method comprises the following steps: a reverse piezoelectric effect of the piezoelectric ceramic is utilized, and a computer controls the piezoelectric ceramic to generate a driving signal, so the piezoelectric ceramic vibrates in an axial direction and the frequency and the amplitude of the vibration are controllable; the compression screw reciprocatingly vibrates in a small amplitude, high frequency, and high acceleration mode; and products with higher intensity than common products are finally obtained by mixing and injection molding.

Description

technical field [0001] The invention relates to a plasticizing molding device, in particular to a device capable of realizing dynamic plasticizing molding processing and an injection molding method thereof. Background technique [0002] In the traditional injection molding process, the melting of plastic is completely completed by external heating and mechanical shearing, and the final die flow is carried out under the action of a stable external force. Due to the poor heat transfer performance of the plastic itself, on a traditional injection machine, in order to completely melt the plastic in the barrel, it often requires a relatively high external temperature to truly transfer heat to the inner plastic. At the same time, because the screw moves back and forth along the axis during the plasticization and injection process, the residence time of the plastic in the barrel is inconsistent, and the heating and shearing processes it bears are also different. To make the plasti...

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Problems solved by technology

The above-mentioned vibration frequency is 0-300 Hz, and the amplitude is 0-1.5 mm. It cannot achieve sub-micron amplitude, nor can it reach the sub-ultrasonic vibration frequency of 16 kHz to 20 kHz, and the driving frequency, applied voltage, and driving waveform cannot be adjusted according to different plastics. feature tweaks

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