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What is the result of using high strength and fine grain molding sand stamping parts as materials?

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What is the result of using high strength and fine grain molding sand stamping parts as materials?

Data:2018-10-05 00:00 Source:http://www.dlhuashuo.com Click:

  Dalian stamping parts use high strength and fine sand as modeling materials. Because the casting temperature of zinc alloy is relatively low, the fire resistance and permeability of molding sand are not high. For molding the punch and the concave die, we can choose sand box modeling or pit modeling. According to the requirements of the mold, the casting system adopts bottom or open type. Due to the large shrinkage coefficient of zinc alloy, a feeding riser should be provided.


  For medium and small moulds, dry casting can be used, or Nirvana casting. Nirvana cast more vent holes. When casting the zinc alloy, the liquid flow in the alloy should be slowly and smoothly injected into the cavity. For large molds, in order to prevent or reduce the deformation of the mold cavity, cooling pipes or chills can be set around the cavity to ensure the sequential solidification of liquid alloys.


  Natural cooling is generally adopted for the castings after casting, but water cooling can also be used for the castings with simple shape, which is beneficial to the improvement of mechanical properties of the alloy. For complex or large zinc alloy dies, cast slowly should be cooled. After the alloy is cooled completely, the castings should be cleaned and the gating and riser should be removed by gas cutting. The mold cavity is no longer processed, but it needs to be grinded with sandpaper.

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