【摘要】 以硬质合金I型拉伸试样为例,模拟了PIM喂料在普通几何模腔的流动情况,讨论了注射速度、注射温度、浇口位置等主要工艺参数对熔体充模过程的影响,预测注射成形过程中部分常见缺陷产生的条件。分析表明:当采用侧面浇口、模温300K、注射温度420K、体积流速61cm3/s的注射参数进行注射可以得到良好的硬质合金I型拉伸试样预成形坯。更多还原

【Abstract】 The simulation of cemented carbide PIM feedstocks flowing in simple cavity is illustrated in this paper, taking cemented carbide I part for example. The effects of injection velocity, temperature, the position of gate are discussed, and the conditions for some defects which often appear in the process of the powder injection molding are predicted.The results show that good green compacts of cemented carbide could be made if the volume flow velocity is equal to 61cm3/s when the die temperature and the injection temperature are at 300K and 420K respectively with lateral injecting gate, which is proved by the experiments.更多还原