Dynamic mold temperature control system for powder injection molding part with high appearance requirement

Abstract

The invention relates to powder injection molding, in particular to a dynamic mold temperature control system for a powder injection molding part with the high appearance requirement. According to thescheme, the dynamic mold temperature control system for the powder injection molding part with the high appearance requirement comprises a quick cooling and quick heating mold temperature control system and a dynamic self-adaptive mold temperature adjusting system; the quick cooling and quick heating mold temperature control system is composed of a high-temperature mold temperature machine (150-200 DEG C), a middle-temperature mold temperature machine (100-150 DEG C), a low-temperature mold temperature machine (20-100 DEG C), an oil cooling mold temperature machine (0-10 DEG C), matched pipelines and automatic adjusting valves; an application zone of the quick cooling and quick heating mold temperature control system comprises a main runner, a sub-runner, a product rubber location and anincoming sub sliding block zone of an injection molding mold; and the dynamic self-adaptive mold temperature adjusting system is used for setting the corresponding temperature on different mold portions in the different stages of injection molding according to the requirements of the product structure and the mold structure. According to the dynamic mold temperature control system for the powder injection molding part with the high appearance requirement, by applying a mold temperature control technology on the different mold portions at different time and different locations in the differentmolding stages, the molding period can be shortened, the material returning amount can be decreased, and the deformation degree of a molded green body can be lowered.

Description

technical field [0001] The invention relates to powder injection molding, in particular to a dynamic mold temperature control system for powder injection molding parts with high appearance requirements. Background technique [0002] With the rapid expansion of the powder injection molding industry, the market for products with high appearance requirements or thin walls, thick walls, and large sizes is expanding, especially consumer electronics accessories with high appearance requirements such as mobile phone backplanes and smart watch cases. Smoothness, no flow lines, weld marks and other injection molding defects have become new requirements. [0003] For products that require a high finish on the product surface, the rapid cooling and rapid heating mold temperature control process combined with the adaptive dynamic mold temperature control system can improve the surface gloss of traditional plastic products compared with traditional powder injection molding, and there wil...

AI Technical Summary

Problems solved by technology

However, this technology cannot adjust the mold temperature adaptively, and cannot quickly adjust the temperature according to the requirements of different process stages and different product parts.

[0005] The powder injection molding feed is made of polymer binder and metal powder. During the injection molding process, it is easy to separate the middle and high polymer binder and metal powder due to temperature changes and unevenness, thus forming Surface defects such as flow lines on the product

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