Ductile iron pipe fittings because of its good corrosion resistance, impact resistance, sealing and other characteristics, can improve the water supply environment, improve water supply capacity and reduce energy consumption, thus becoming China's current water supply industry commonly used in the main pipe. Which we use the automatic level of molding machine products customers also reflect this problem, they also asked us to solve, this time, we have to look at the sand and sticky sand on the simple analysis to study whether practical.

But in the ductile iron pipe brushing paint prone to cast sand, sand eyes of the situation. There are two main reasons for this:
 
First, because the gate brushing paint more difficult and difficult.
 
Two is in the pouring process pouring high temperature, scouring large, paint in the erosion and high temperature soak is easy to fall off. Resulting in sand sand eyes. Many castings have been very much attention to the sprue. Ignoring the scouring of the runner wall during pouring. Thus leading to the ductile iron pipe castings sand sand eyes. So in order to improve the casting yield, improve casting quality, reduce the total cost of casting. The use of casting pots, this product is easy to use, with smooth flow, resistance to molten iron, molten steel scouring, do not absorb molten steel, can be sawable and other characteristics, can simplify the modeling process, eliminating the difficulties inside the gate paint work, and To improve the layout of the casting system, to avoid casting sand, trachoma, sand defects. This can be said that the best way, we can come to use it.

Ductile iron pipe fittings due to its use of the environment, corrosion phenomenon is inevitable, so we need to know how to deal with the phenomenon of bulb tube bulb.
 
Cause Analysis of Sticky Sand in Ductile Iron Pipe
 
1, enough pressure to penetrate the metal liquid between the higher metal liquid static pressure head. Ie the casting height and the pressure formed by the casting system. Such as the pressure exceeds the shear pressure formed by the capillary phenomenon between the sand gaps. That is, corpse hair = QcosO / r, where P hair is capillary pressure; Ductile tube for the metal surface tension; e for the metal liquid capillary wetting angle; r for the capillary radius. It will form a mechanical sticky sand. Static pressure head more than 500mm, forging sand and thick, most will produce angry but willing to sticky sand, unless the paint. The formula also shows that: the greater the size of the sand particles, the smaller the body, the more easy to produce angry but willing to sticky sand.

2, the metal liquid flow in the mold to form the dynamic pressure.
 
3, casting "burst" or "choke". That is, when the mold is cast, the combustible gas is mixed with the air and is ignited by the hot metal liquid.

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