- 期刊
透過雷射製程參數調控模具表面粗糙度、硬度與孔隙大小之研究與案例分享
Control mold surface roughness, hardness, and pore size through laser process parameters and applications
摘要
傳統塑膠射出模具遇到結構複雜或深寬比長的模仁時，常會有不飽射、氣泡殘留等問題，但受限於逃氣孔位置過遠或無法使用等問題，因此需使用透氣模具或滑塊來解決逃氣問題，提升射出產品的良率。金屬粉末雷射造型複合加工技術所具有的加工柔性，可以在模具的任選位置上構造出具有稀鬆緻密度的多孔質層，孔徑範圍：0.03-0.6 mm，用於排除模內困氣，甚至用作為氣輔成型時的腔內進氣部位。本案例開發之模具加入創新的SLM多孔隙製程技術，可控的孔隙度、孔洞大小與厚度，可使空氣能順利滲透，降低注射壓力、減少成型和保壓時間。現今多以加入透氣鋼來解決，但目前市售透氣鋼價格昂貴且有相當多的局限性，因此本文利用此技術開發所產生的孔洞性來應用於模具上，使氣體跑入模穴就從周圍的孔洞排出，避免真空現象發生。
並列摘要
When traditional plastic injection molds encounter mold cores with complex structures or long aspect ratios, they often have problems such as insufficient injection and residual air bubbles. However, they are limited by problems such as too far away from the escape holes or cannot be used. Therefore, it is necessary to design and use a breathable molds or ventilated sliders are used to solve the problem of air escape and improve the yield of injection products.The processing flexibility of the metal powder laser molding composite processing technology enables it to control the melting degree of the metal powder through laser, so as to control the density of the molding parts. Effect using this technology, a loose and dense porous layer can be constructed at any position of the mold, with a pore size range of 0.03-0.6mm, which is used to eliminate trapped air in the mold, and can even be used as a barrier for gas-assisted molding and intake part of the cavity. The article on the multi-porous breathable mold developed in this case is to combine the current popular technology-composite laminated manufacturing technology to realize the design and manufacture of complex flow channels, adding innovative SLM multi-porosity process technology, controllable porosity , pore size and thickness, so that air can penetrate and pass through smoothly. The characteristic is to reduce injection pressure, reduce molding and holding time. Nowadays, it is mostly solved by adding breathable steel. However, the current commercially available breathable steel is expensive and has considerable limitations in performance. Therefore, this article uses the porosity produced by the metal laminate manufacturing technology to apply it to the mold, so that the gas enters the mold cavity is discharged from the surrounding holes and avoid vacuum phenomenon.