Precision casting can have such good technology, of course, because the structure of the precision casting, to facilitate manufacturing model, core box and style:1, Qingdao hexing precision castings appearance should strive to simple, in order to draw, should try to make the casting parting surface is flat, and the number of the smallest.2, Qingdao lumen hexing precision castings shall seek no or little use casting cores, when using core, should be the support, the fixed and exhaust sanding, should have enough technology hole when necessary.3, inner and outer side for precision casting and strengthening rib structure, should be in the draw direction Angle is equipped with a certain structure.4, Qingdao hexing precision casting on the convex part of the ontology and precision castings should not differ too much, it is best to take the same height, the same distance on the surface of the close several convex sets, best into convex part of the whole.