Ductile iron art manhole cover: Many manufacturers have experienced such an experience. When the ductile iron rainwater grating is transported to the supplier, the appearance design and appearance of the rainwater grille are somewhat different from the size of the drawing, and some are even more seriously deformed. For example, the packaging strips are bent and deformed, the straight lines are very different, and the crossbars are welded to these. This is the deformation of the rainwater grille. At this time, the subjective evaluation is usually that the quality of the products produced by the manufacturer is poor, and more serious disputes will continue to arise.
How to prevent the deformation of the ductile iron rainwater grate?
1. When welding rainwater grates, the flat steel should be straightened before welding.
2. Before pickling passivation and hot-dip galvanizing, remove the internal stress of the rainwater grating. In intelligent industrial production, it is generally not easy to cause such problems.
3. At least three rainwater grate bases need to be placed, which can be placed on both sides and in the middle. Drying can't just be placed on both sides, and it can't be placed in the middle. More rainwater grates pressed on it will cause deformation, making the surface more and more different.
4. Place it stably during the entire transportation process, so that its bearing capacity is symmetrical, and it is not easy to fall down during loading and unloading. It should be handled with care to ensure that the rainwater grille is not easily deformed
How does the ductile iron rainwater grate deform?
1. When the surface of the rainwater grille is hot-dip galvanized, the rainwater grille will also be deformed under high temperature. If the internal stress of the rainwater grille is strong after welding, serious deformation will occur at this time.
2. Internal stress in the rainwater grid substrate. If the flat bar is not straightened when welding the rainwater grating, just put the flat bar on the mold immediately and weld it. The surface looks straight, but in fact, the rainwater grille causes strong internal stress at this time. If a strong external force is added (such as high temperature, beating, extrusion), the internal stress will be manifested, and the appearance of the rain grate will become a standard bow.
3. When transporting rainwater grates, minimize bruises, extrusion molding and collisions.
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