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以1650MPa的压制压力对粒度为-100/+140到-400目的几种电解和还原铜粉筛分料进行了压制。通过载荷一位移曲线的数字化,计算了各种成形压力下的压坯密度。由脱模载荷一压坯位移曲线得到的最大滑动载荷确定了脱模力。使用Heckel′s压制方程进行的分析表明,在不同的压力范围内,三种不同的致密化机理是有效的。还发现,Heckel′s方程的常数K和A对粉末的粒度和形状很敏感。也可推断,生坯密度和脱模力将随着粉末粒度及形状不规则程度的增加而增加。而且颗粒形状对于压制和脱模过程的影响大于粒度的影响。
Several electrolytic and reduced copper powder sifting materials were pressed at a pressing pressure of 1650 MPa against a particle size of -100 / + 140 to -400 mesh. By digitizing the load-displacement curve, the compact density at various forming pressures was calculated. Demolding load by a squeegee displacement curve obtained the maximum sliding load to determine the release force. Analysis using Heckel’s pressing equation shows that three different densification mechanisms are effective at different pressure ranges. It has also been found that the constants K and A of the Heckel’s equation are sensitive to the particle size and shape of the powder. It can also be inferred that the green density and the release force will increase as the particle size and shape irregularities increase. Moreover, the effect of particle shape on pressing and demolding processes is greater than the effect of particle size.