基于响应面法的粉末挤出打印黄铜材料工艺参数优化

Optimization for Process Parameters for Powder Extrusion Printing of Brass Materials based on Response Surface Method

以水雾化CuZn30黄铜粉末为主要原料,微晶蜡等有机物为粘结剂,经混炼、破碎和过筛得到打印喂料,通过粉末挤出3D打印制得打印坯体。以层厚、挤出温度、挤出率和打印速度为研究因素,以生坯密度为响应指标,采用中心复合设计(Central Composite Design,CCD)进行实验设计,并建立响应面分析数学模型。实验结果表明:在实验优化范围内,打印件的生坯密度大小主要由层厚和挤出温度决定,当层厚为0.25 mm、挤出温度为150℃、挤出率为140%、打印速度为50 mm/s时可获得生坯密度最高的打印坯体。

The printing feed stocks were obtained by mixing,crushing and sieving through using water-atomized CuZn30 brass powders as raw materials and organics such as micro-crystalline wax as binder,and the printing blanks were produced by powder extrusion printing.The experimental design was carried out by using the central composite design(CCD)with layer thickness,extrusion temperature,extrusion multiplier and printing speed as the research factors,and the green density as the response index,so as to establish a response surface analysis mathematical model.The experimental results showed that in the experimental optimization range,the density of the green part was mainly determined by the layer thickness and the extrusion temperature.When the layer thickness was 0.25 mm,extrusion temperature was 150℃,extrusion multiplier was 140%and printing speed was 50 mm/s,the green part achieved the highest density.