Best describes how these three factors affect the fluidity of MIM stainless steeltime：2020-06-05Views：318 Author：Best Seiko
Metal powder injection molding plant process (abbreviated as MIM) is a method of mixing metal powder and organic binder into granules, and then manufacturing them into specific traits by injection molding, especially suitable for small and precise The manufacture of complex parts has also been recognized and used by a large number of precision parts manufacturers, such as powder metallurgy miniature gears, MIM auto parts, and MIM mobile phone parts, etc., which occupy an important position in the field of metal product forming today. The metal powder injection molding plant process needs to prepare the injection material in advance, which is often referred to as MIM feed, and has relatively strict requirements on the rheology of the feed. The two currently used feeds for injection of metal powders for MIM technology are iron-based feeds (eg Fe2Ni, Fe8Ni) and stainless steel feeds (eg SUS316L, SUS630 17-4, SUS304, etc.). Demand is increasing, and research on stainless steel feeding is rapidly heating up. Feeding is the first step in the metal powder injection molding plant process, so the characteristics of the feed directly affect all subsequent metal powder injection molding process parameters and the quality characteristics of the finished product. Best Editor Seiko takes the commonly used stainless steel as an example to introduce the three factors that affect the flowability of stainless steel feed in the process parameters of the metal powder injection molding plant: First, the metal powder loading in the process of the metal powder injection molding plant. The powder loading is a ratio, which refers to the percentage of the metal powder volume to the total volume of the feed. The greater the loading of metal powder, the greater the proportion of metal powder in the feed. At this time, the viscosity of the feed increases and the rheology becomes correspondingly worse; when the loading of metal powder becomes smaller, the proportion of binder changes accordingly. The viscosity of the feed decreases and the fluidity improves. Shenzhen Best Precision Industry Co., Ltd. specially reminds everyone that the more binders, the better, but also the influence of the amount of binders on other subsequent processes. Second, the shear rate in metal powder injection molding plant processes. In the process of metal powder injection molding, the stainless steel feed flows at a high shear rate, so the feed is heated by high shear force, and the viscosity decreases after the heat is generated, so the fluidity is strong; otherwise, the feed is at a low shear Flowing at a rate, the heat generated by the lower shear force is slower, the viscosity will not be significantly reduced, and the fluidity is relatively poor. Third, the temperature in the metal powder injection molding plant process. Here mainly refers to the injection temperature of the metal powder injection molding and the temperature after entering the mold cavity. The effect of temperature is a thermally activated process for stainless steel feeding. Temperature affects the fluidity of the feed viscosity. When the temperature increases, the viscosity of the feed will become smaller and the corresponding fluidity will become stronger; When the temperature is lowered, the feed viscosity becomes larger and the fluidity will be relatively poor. The above are the three main factors that affect the flow of stainless steel feed flow in the metal powder injection molding plant process organized by Best Seiko. In general, the influence of various factors on stainless steel feeding will follow the above rules, but there are many factors that affect the fluidity of stainless steel, and the changes reflected in different production conditions are also different, so Shenzhen Best Precision believes that Each stainless steel product manufacturer should consider comprehensively when purchasing and using stainless steel feed, and adjust the working environment to a very good state according to the actual situation.
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