Question

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Air trapped in unvented pockets or recesses in the mold can exit these aras or teardrop-shaped surface defects. Severe weld line often form where flow streams meet head on, especially at the end of fill. You can often improve the strength and appearance of these weld lines by installing overflow wells. Overflow wells are modfied vent features that provide and extra-deep vent channel, usually about one-third the part thickness, that empties into a cylinderical well. Venting air escapes that well around a shortened ejector pin fittted with a 0.002-inch clearance. Cool material at the leading edge of the advancing of flow frontd merges and enters the overflow well leaving hotter material to mix and fuse at the weld line. The overflow well is ejected with the part and clipped off after molding. Overflow wells can alos provide ejector-pin lcation for parts such as clock faces or instrument lenses that cannot to tolerate ejector-pin marks on the part surface.

Answer 1

空气被困住在unvented 口袋或凹进处内在模子可能退出这些aras 或泪珠形状的表面瑕疵。严厉焊接线经常形式流程小河遇见头的地方, 特别是在积土的末端。您能经常改进这些焊接线力量和出现经过安装溢出井。溢出井是modfied 提供和额外深出气孔渠道的出气孔特点, 通常大约三分之一部份厚度, 倒空入一口cylinderical 井。通风口在一个被变短的喷射器别针附近很好fittted 以0.002 英寸清除的空气逃命。凉快的材料在推进的前沿流程frontd 合并和进入溢出好的离开的更热的材料对混合和保险丝在焊接线。溢出井抛出与零件和被截去在铸造以后。溢出井装alos 于罐中为部份提供喷射器别针lcation 譬如无法容忍喷射器别针标记在零件表面的时钟表盘或仪器透镜。