为铸造高精度的优质铸件,必须有稳定的好铸型。要造出良好的铸型,其首要条件就是稳定地供给质量好的型砂,同时要有合适的造型操作相配合。虽然湿型铸型的造型方法有各种各样,但几乎都为自动化操作,因此造型条件可以认为基本是稳定的。重要的是型砂的稳定性。化学粘结的造型材料几乎都只能使用一次而失去粘结力,因此这种型砂每次都必须加入新的粘结剂,经混辗后才能再使用。可是湿型单一砂,其大部分旧砂都可回收而循环再使 To cast high-precision high-quality castings, there must be a stable, good mold. To create a good mold, the first condition is the steady supply of good quality sand, at the same time have the appropriate shape matching. Although there are a variety of styling methods for wet molds, almost all of them are automated, so styling conditions can be considered as essentially stable. Important is the stability of the sand. Almost all of the chemically bonded molding materials can only be used once and lose the bonding force, so the sand must be added each time a new binder, the roller after re-use. However, wet single sand, most of its old sand can be recycled and re-use