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大家知道,型砂和芯砂的好坏对铸件的质量有很大的影响,铸件中的一些主要缺陷,如砂眼,气孔,粘砂,夹砂,裂纹等,都与型(芯)砂有直接的关系。另外,型砂的性能还直接影响造型的工艺操作和生产成本。因此用于铸造生产的型砂必须具备一定的性能。一、强度型砂的强度是指型砂紧实后在外力作用下能抵抗破坏的能力。型砂的强度可分为温强度和干强度,也可以根据试验方法分为抗压强度,抗拉强度,抗剪强度,抗弯强度等(见图1)。如果强度不足,铸型在起模、搬运、合箱时会损坏,在浇注时会造成冲砂,胀砂等缺
As we all know, the quality of sand and core sand castings have a great impact on the quality of the castings, some of the major defects in the casting, such as trachoma, porosity, sticky sand, sand, cracks, etc., with the Relationship. In addition, the performance of sand also has a direct impact on the molding process operations and production costs. Therefore, the sand used for casting production must have a certain performance. First, the strength of the strength of the sand sand is sand compacted under the action of external force to resist damage. Sand strength can be divided into temperature strength and dry strength, but also can be divided into test methods according to compressive strength, tensile strength, shear strength, bending strength (see Figure 1). If the strength is insufficient, the mold will be damaged when it is removed from the mold, handled and combined with the box, and it will cause sand and sand expansion when pouring