Resin Sand Casting
What is resin sand casting?
Resin sand casting process is a kind of floor molding process by using the resin sand as the molding material. Resin sand is a kind of mixture of quartz sand and resin. After mixing and burning, the resin sand could become very hard and solid, so we called it as the hard mold. The iron casting made by resin sand will be usually called as resin sand casting.
What is the character of resin sand casting?
Since resin sand mold is very hard and solid, and it has smooth surfaces, so the resin sand casting has more accurate dimensions and better surface smoothness, and less sand residual and casting defects on the surfaces and inside.
What kinds of castings are suitable for resin sand casting process?
Because the resin sand is expensive, and lower production rate than green sand casting process, so it is more suitable to produce larger iron castings, such as the castings with weight from dozens of kilograms to several tons. By the way, resin sand casting process is not suitable to produce steel castings since steel castings need higher air permeability.
What is the disadvantage of resin sand casting process?
One disadvantage is the low production rate. Since the resin sand needs to be mixed and burning, it needs more production time. Another is the high production costs. The resin price is increasing largely by the end of 2010 because of the flood in northern China. Moreover, the prices of the related materials such as paints are also increasing. So, the resin sand casting became more and more expensive than before.
Various high quality castings are made of gray iron, ductile iron, aluminum, steel, brass etc. Quality control checks are performed throughout the casting process form screening the raw material for stability the concentration of alloy and melted by the electric furnace. We analyze the chemical elements concentration of the alloy with spark spectrometer testing before casting¡ After casting and heat treatment we continue testing by metallurgical microstructure analysis, as well as checking tensile, impact strength and surface hardness by physical test and magnetic particle etc.