Many manufacturers have experienced such an experience. When the ductile iron manhole cover is delivered to suppliers and customers, the appearance and shape of the rainwater grate are different from the size of the drawing, and some even have serious deformation. For example, the edge strip is bent and deformed, the difference between the straight lines is very large, and the horizontal bar is opened and welded.
How to prevent the deformation of the ductile iron manhole cover?
1. In the case of welding ductile iron manhole covers, the flat steel should be straightened before welding.
2. Before pickling and galvanizing, remove the internal stress of the manhole cover. In intelligent industrial production, such problems will generally not occur.
3. At least three ductile iron manhole cover bases need to be placed, and they can be placed on both sides and in the middle. It is absolutely impossible to only put them on both sides and not in the middle. If there are too many rainwater grates on it, it will deform and make it become uneven.
Keep it stable during the transportation process, so that it can bear evenly, and it will not be knocked hard during loading and unloading.
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