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农用深井潜水电泵的水泵叶轮、导流壳质量的好坏直接影响到水泵的性能。铸造叶轮、导流壳的关键在泥芯部分。我们厂生产这两种零件的芯盒全是铸造黄铜的,芯沙是郑家屯白沙(粒度100/200),粘结剂是合脂油。但由于合脂油粘度大,往往发生粘模的现象,影响泥芯的质量。采用红砖粉作脱模剂使泥芯质量提高很多。对保证、提高这些铸件过流部分的尺寸精度和表面光洁度作用较大,效果很好。具体作法是:将建筑用红砖粉碎,筛出100~#～200~#细粉,用炉烘干后放入沙布袋里。在制造泥芯时,先将比粉抖入芯盒少许,再放芯沙造型。由于砖粉具有吸潮作用,解决了泥芯的粘膜问题;另一方面,细小的砖粉
Agricultural deep well submersible pump pump impeller, diversion shell quality directly affects the performance of the pump. Casting impeller, diversion shell key in the mud core part. Our factory production of these two parts of the core box is all cast brass, sand core is Zhengtaitun Baisha (size 100/200), the binder is combined fat. However, due to the high viscosity of fat, sticking phenomenon often occurs, affecting the quality of mud core. The use of red brick powder as mold release agent to improve the quality of mud core lot. On the guarantee, improve the flow of these castings part of the size of the accuracy and surface finish larger, the effect is very good. The specific approach is: smash the building with red brick, sift out 100 ~ # ~ 200 ~ # fine powder, oven dried into sand bag. In the manufacture of mud core, the first shake than a little bit into the core box, put sand core shape. As the brick has a moisture absorption effect, to solve the mucus muck problem; the other hand, a small brick powder