Cross-scale macro-micro coinjection molding rapid molding method based on tungsten metal mold core

Abstract

The invention relates to a rapid prototyping method for cross-scale macro-micro co-injection molding based on a metal tungsten mold core. In the method, a metal tungsten etching technique is used to manufacture a micro-mold, the obtained metal tungsten micro-mold is embedded in a macroscale mold (traditional mold), and then an injection molding process is used to realize co-injection molding of the macrostructure and the microstructure. This method adopts two-stage clamping injection molding, first injection molding in the half-closed state, and then compression molding in the fully-closed state. The two-step molding is controlled separately, and the macrostructure is formed in the half-closed stage, and the microstructure is realized in the fully-closed stage. forming. The invention adopts the metal tungsten micro-mold core, which greatly improves the line accuracy and mold life in the micro-injection molding process, and reduces the cost; the metal tungsten is embedded in the traditional mold as the mold core, and the existing injection molding machine is used to realize micro-injection molding, which is beneficial to the process. Standardized integration.

Description

technical field [0001] The invention belongs to the fields of metal tungsten etching technology and injection molding technology, and in particular relates to a cross-scale macro-micro co-injection rapid prototyping method based on a metal tungsten mold core. Background technique [0002] With the development of manufacturing technology to the micro-nano scale, the requirements for products with both macroscopic and microscopic feature sizes are getting higher and higher. For example, microfluidic chips are in increasing demand in the fields of chemistry and biology. The size of the chip is about a few square centimeters, and the width and depth of the microchannels are on the order of microns. Due to the wide application of microfluidic chips, especially in the biological field, it is necessary to meet the requirements of low cost, biocompatibility, flexibility and mass production, and these requirements are difficult to meet at the same time. [0003] Plastic materials a...

AI Technical Summary

Problems solved by technology

At present, silicon molds or nickel molds are mostly manufactured by the LIGA method, but the LIGA method is expensive, and the mold life of silicon and nickel materials is poor

[0005] 2. Micro-injection molding process Because the macro-micro scale spans 4 orders of magnitude, in micro-injection molding, it often occurs that the filling of the micro-plastic parts is incomplete, the weld line is obvious, or the cavity of the micro-mold is caused by the increase of the melt filling flow resistance and viscosity. The gas in the gas cannot be discharged smoothly, resulting in quality defects such as local burns and blackening of the micro-plastic parts and internal pores, which seriously affect the molding quality and practical application of the micro-plastic parts.

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