Shandong ductile iron manhole cover is a kind of cast iron products are very common in our daily life, but for the ductile cast iron grate performance or that is a common problem is not very understanding, nodular cast iron grate as metal material, the use of the inevitable expansion and contraction, but the application in the road, as a part of the road of the nodular cast iron grate once this phenomenon will cause extremely serious consequences, it should be how to solve this kind of phenomenon?
1. take reasonable process design. The ingate in nodular cast iron grate relatively thin wall, when the number of scattered. The metal liquid that first enters the thick wall is first solidified, and the thin wall is solidified in the back to achieve the basic equilibrium solidification.
For the machine tool castings with uniform wall thickness, many inner castings and vent holes are used. The inside runner is more, dispersed and evenly distributed, so that the whole heat is balanced. The vent hole is fine and many, which also makes the exhaust smooth and plays the role of heat dissipation.
With the thickness of hot spot 2。 is formed on the grate structure of ductile iron, by rapid solidification, the basic balance of the man-made grate temperature throughout the ductile iron field。 The cold iron, in part by the zircon sand is the large heat, chromite sand or special coatings。
Other 3. use a heat storage material.
4。 ductile cast iron grate by low temperature fast firing, open gating system。
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