Abstract In this paper, milling cutter was prepared, by metal injection molding (MIM) process under four gate patterns with different numbers and locations. Combined with Cross-WLF viscosity model, the influence of the gate patterns on powder concentration was analyzed using Moldflow2017 software. The results show that the position and the number of the gates can affect the distributions of the powder in the milling cutter. While filling, the pressure has little effect on the distribution of powder concentration. For, different gate patterns, the change of shear rate of the feeding is different during the filling process, thus the distribution of powder concentration appears obvious difference. Using two gates in the end of handle plane, while filling, the distribution of powder concentration is in the range of ±0.5%. The powder distribution is evenly distributed, which meets the requirements of injection molding process. It is the optimal gate patterns when milling cutter is prepared by MIM.
LIU Fei,LI Wenming. Numerical simulation research on the effect of gate patterns on powder volume fraction variation of MIM milling cutter[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(3): 292-297.
[1] 尚峰, 姬祖春, 付广柱. 粉末粒度对注射成形Fe-50%Ni 金显微组织和力学性能的影响[J]. 热加工工艺, 2014, 43(10): 34-36. SHANG Feng, JI Zuchun, FU guangzhu. Effects of particle size of powder on microstructure and mechanical property of metal injection molding Fe-50%Ni alloy[J]. Hot Working Technology, 2014, 43(10): 34-36. [2] SHIVASHANKAR T S, ENNETI R K, PARK S J, et al.The effects of material attributes on powder-binder separation phenomena in powder injection molding[J]. Powder Technology, 2013, 243(7): 79-84. [3] 李益民, Khalil K A, 黄伯云. 金属注射成形17-4PH不锈钢的研究[J]. 粉末冶金技术, 2005, 23(4): 254-258. LI Yimin, KHALIL K A, HUANG Baiyun.Metal injection molding 17-4PH stainless steel[J]. Powder Metallurgy Technology, 2005, 23(4): 254-258. [4] 宋明, 谢志鹏, 温佳鑫, 等. 先进陶瓷注射成形的脱脂工艺进展[J]. 陶瓷学报, 2015(2): 119-126. SONG Ming, XIE Zhipeng, WEN Jiaxin, et al.Progress in the debinding process of advanced ceramic injection molding[J]. Journal of Ceramics, 2015(2): 119-126. [5] 许静静. 金属粉末注射成形工艺参数及浇口尺寸对流动性能的影响[D]. 长沙: 中南大学, 2004: 10-12. XU Jingjing.Influence of metal powder injection molding process parameters and gate size on flow performance[D]. Changsha: Central South University, 2004: 10-12. [6] 蒋炳炎, 许静静, 黄伯云, 等. 金属粉末注射成形模具浇口对成形性能的影响规律[J]. 粉末冶金技术, 2004, 22(6): 323-327. JIANG Binyan, XU Jingjing, HUANG Baiyun.Effect of gate dimensions on molding capability in metal injection molding[J]. Powder Metallurgy Technology, 2004, 22(6): 323-327. [7] 郑洲顺, 曲选辉, 徐勤武, 等. 粉末注射成形两相流动三维数值模拟及粉末与粘结剂的分离[J]. 中国有色金属学报, 2014, 22(1): 122-129. ZHENG Shunzhou, QU Xuanhui, XU Qinwu.Three dimensional numerical simulation of two-phase flow for powder injection molding and separation of powder and binder[J]. The Chinese Journal of Nonferrous Metals, 2014, 22(1): 122-129. [8] ANN S, PARK S J, LEE S, et al.Effect of powders and binders on material properties an molding parameters in iron and stainless steel powder injection molding process[J]. Powder Technology, 2009, 193(2): 162-169. [9] 刘煜, 李益民, 夏卿坤, 等. 粉末注射成形的离散元模拟实验研究[J]. 材料工程, 2014(4): 85-88. LIU Yu, LI Yimin, XIA Qingkun.Experimental study on discrete element simulation of powder injection molding[J]. Material Engineering, 2014(4): 85-88. [10] 郑洲顺, 曲选辉, 韩旭里. PMI粉末一粘结剂固液两相流的动力学基本方程[J]. 稀有金属与硬质合金, 2002, 30(4): 1-5. ZHENG Shunzhou, QU Xuanhui, HAN Xuli.Basic kinetic equations of solid-liquid phase flow powder binder of PIM[J]. Rare Metals and Cemented Carbides, 2002, 30(4): 1-5. [11] 刘春太. 注射成形过程中非牛顿塑料熔体的粘度模型[J]. 中国塑料, 1997, 11(1): 48-52. LIU Chuntai.The viscosity of non-newtonan plastics melt in injection molding[J]. China Plastics, 1997, 11(1): 48-52. [12] QUINARDC, SONG J, BARRIERET. Elaboration of PIM feedstocks with 316L fine stainless steel powders for the processing of micro-components[J]. Powder Technology, 2011, 208(2): 383-389. [13] SAMANTA S K, CHATTOPADHYAYH, PUSTAL B, et al.A numerical study of solidification in powder injection molding process[J]. International Journal of Heat and Mass Transfer, 2008, 51(3): 672-677. [14] GERMAN R M, BOSE A.Injection molding of metals and ceramics[J]. Metal Powder Industries Federation, 1997: 15-28.
2018, Vol. 23 
