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振動(dòng)力場(chǎng)對(duì)金屬粉末注射熔體流變性能及相分離的影響研究(華工學(xué)報(bào))(留存版)

  

【正文】 工程教育部重點(diǎn)實(shí)驗(yàn)室 廣州 5106402.廣州有色金屬研究院,廣州 510650)摘 要:本文介紹了動(dòng)態(tài)注射成型技術(shù)在金屬粉末注射成型中的應(yīng)用情況,探討了振動(dòng)頻率、振幅對(duì)316L不銹鋼粉末喂料熔體流變性能及相分離的影響。同時(shí),由于MIM喂料容易由于內(nèi)摩擦產(chǎn)生的熱量而使得粘結(jié)劑分解,從而影響流動(dòng)性。 (a)裝載量40%,L= cm (b)裝載量30%,L= cm (c)裝載量20%,L=圖2 振幅A=150um、頻率f=10Hz工藝條件下不同粉末裝載量流程測(cè)試試樣Fig. 2 The flow length of different powder loading samples when A=150um,f=10Hz在注射成型實(shí)驗(yàn)完成24h后,在室溫下記錄各有效試樣的長(zhǎng)度尺寸。從圖7中可以看出,振幅對(duì)相分離的影響不明顯,如粉末裝載量為30%時(shí),%,%,說明振幅對(duì)相分離的影響較小。 liubinbox***********************************************第 8 頁(yè) 共 8 頁(yè)。金屬粉末裝載量為30%的喂料熔體在振動(dòng)注射過程中,、其上限的體積比可以從圖7中看出,%,;%。從表2可以看出,在加入振動(dòng)后,各種粉末裝載量下的喂料的流程相比于穩(wěn)態(tài)情況下的均有所增加,這說明動(dòng)態(tài)注射成型能改善金屬粉末喂料的流變性能,使喂料在充模階段的流動(dòng)性更好,更易于充模?;诮饘俜勰┪沽虾途酆衔镌谛阅苌系牟町?,何亮等[7]人針對(duì)金屬粉末喂料高粘度、強(qiáng)剪切、高摩擦熱的特點(diǎn)對(duì)塑料動(dòng)態(tài)注射機(jī)的塑化部件進(jìn)行了改造,制成了一臺(tái)金屬粉末動(dòng)態(tài)注射成型機(jī)DPII90,其原理示意圖如圖1所示。關(guān)鍵詞:動(dòng)態(tài)注射成型;金屬粉末注射;流變性能;相分離Study on the Effect of Vibration Force Field on the Melt Rheology and Powder PhaseisolationLiu Bin1 Luo Jiewen1, 2 Qu Jinpin1 Cai Yixiang2(1. The Key Laboratory of Polymer Processing Engineering of Ministry Education, South China University of Technology, Guangzhou, 5106402. Guangzhou Research Institute of Nonferrous Metals,Guangzhou 510650)ABSTRACT:The application of dynamic injection molding in the metal injection molding is introduced in this paper. The dynamic injection molding experiment result shows that the dynamic frequency and amplitude ameliorate the feedstock’s rheological property and lengthen the flow length in the Archimedes helical mold. The scanning electron microscope test result shows that the dynamic frequency and amplitude ameliorate the feedstocks phaseisolation. When the dynamic frequency f is10Hz and the amplitude A is , the affection is the best..KEYWORDS:Dynamic Injection Molding。在高分子填充體系加工工程中引入振動(dòng)場(chǎng),對(duì)于體系的混合特性
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