摘要
根据金属粉末注射成形原理 ,在材料、模具温度等试验条件一致的前提下 ,将螺旋测试模与 0 5～2 1mm之间的 6个不同深度尺寸的侧浇口相结合 ,通过改变注射料熔体温度、注射压力、注射速率等工艺参数 ,描绘出在不同工艺参数时的侧浇口深度尺寸与阿基米德螺妖线长度的关系曲线 ,从而研究得到金属粉末注射成形的浇口尺寸与注射料熔体注射成形性能的关系规律 :浇口尺寸对金属粉末螺旋线流动长度的影响较大 ,且不成比例 ;浇口尺寸与螺旋线流动长度关系曲线 (L -H曲线 )的变化不是单调的递增或递减 ,曲线形状呈较为明显的“波浪”形 ;在一定试验条件下粉末注射成形的理想浇口尺寸值为 1 8mm ,要偏大于注塑成形的浇口尺寸值 ;相对注射压力变化时浇口尺寸对L -H曲线关系的影响而言 ,注射料熔体温度和注射速率的影响相对较小 ,波动方向一致且较平坦 ,曲线有微小的上升趋势 ;当浇口尺寸一定时 。
Based on principles of Metal Injection Molding (MIM), when the experimental conditions are invariable, giving six values between 0.5 mm and 2.1 mm of depth of the side gate, basic laws that gate dimensions affect the molding capability were found by drawing their relation curve, through changing some technologic parameters such as injection pressure, injection rate and feedstock temperature. The relation between the depth of gate and the Archimedes flow length is nonlinear, and the H-L curve is of obvious wave. Besides, under some given conditions, depth of the gate with the longest flow length is 1.8 mm, which is longer than that of Plastic Injection Molding. Compared with effect of injection pressure, effect of feedstock temperature or injection rate on the H-L curve is smaller. When the dimension of the gate is invariable, effect of technologic parameters on the flow length in MIM is similar to that in Plastic Injection Molding.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2004年第6期323-327,共5页
Powder Metallurgy Technology
基金
国家重点基础研究发展规划 973计划项目 (G2 0 0 0 0 6 72 0 0 )
