Hot runner unit, injection molding system and control method of injection molding system

Abstract

The invention discloses a hot runner unit comprising a fixed mold plate and a splitter plate, a nozzle is arranged on the fixed mold plate, the nozzle comprises a nozzle body, a main runner is arranged in the nozzle body, the splitter plate comprises a splitter plate body, a sub-runner communicated with the main runner is arranged in the splitter plate body, and a pressure sensor is mounted in the sub-runner. According to the invention, the pressure sensor is used for detecting the pressure of the sub-runner, then the pressure of the sub-runner is compared with the injection pressure applied to a screw rod, and the injection pressure is adjusted, so that the pressure of the hot fluid in the sub-runner meets the requirements of the injection molding process parameters of the mold; influence of injection pressure loss caused by abrasion and aging of components of the injection unit on product quality is avoided; meanwhile, abrasion and aging degrees of the components of the injection unit are monitored, and early warning at the early stage of fault occurrence is achieved. The invention further discloses an injection molding system with the hot runner unit. The invention further discloses a control method of the thermal injection molding system.

Description

technical field [0001] The invention belongs to the technical field of plastic injection molding, and in particular relates to a hot runner unit, an injection molding system and a control method for the injection molding system. Background technique [0002] Injection molding is to feed the granular or powdery fiber-resin mixture into the barrel, heat and melt it, pressurize it by a plunger or screw, inject it into a closed mold with a lower temperature through a nozzle, and after cooling and setting, demould to obtain a plastic product Among them, injection pressure is the most important process parameter of injection molding, and the accuracy of injection pressure plays a key role in the quality of plastic products, the stability of production process, and the solution of injection molding defects. [0003] However, with the passage of time, due to the wear and aging of the components of the injection unit, uncertain faults, pressure loss between the nozzle of the injectio...

AI Technical Summary

Problems solved by technology

[0003] However, with the passage of time, due to the wear and aging of the components of the injection unit, uncertain faults, pressure loss between the nozzle of the injection unit and the mold, etc., the accurate output of the injection pressure is affected, resulting in the displayed injection pressure and the injection molding process parameter setting. Deviations in the injection pressure lead to defects such as sink marks, deformation, and dimensional deviation of plastic products. At the same time, the pressure data cannot form experience precipitation, which hinders the injection molding process debugging and the intelligent development of injection molding production.

[0004] For example, a Chinese patent discloses a hot runner system for injection molding, including: a main channel, a manifold, a hot nozzle and a controller. The main channel is connected with a first pressure pump for driving the thermal fluid; It includes a confluence channel docked with the main flow channel and a plurality of sub-runners branched from the confluence channel. A second pressure pump is provided on the sub-runner; a hot nozzle is connected under each sub-runner, and a pressure sensor is installed inside the hot nozzle for heating. The pressure of the thermal fluid flowing into the hot nozzle after pressure is used to meet the requirements of the injection molding process, but it cannot reflect the loss of injection pressure

Images