Cast Iron Weights Caution Precautions
1) Due to the high fluidity of cast iron, with minimal shrinkage and line shrinkage, thin-walled and complex-shaped castings can be planned.
2) The mechanical properties of cast iron are highly sensitive to wall thickness, thus it is not advisable to increase the load-bearing capacity of castings by adding wall thickness. Instead, the objective of both eliminating thick sections and enhancing load-bearing capacity can be achieved by altering the shape of the cross-section.
3) Due to the fact that gray cast iron has a compressive strength three to four times higher than its tensile strength, to fully utilize the characteristics of gray cast iron, it is advisable to commonly use asymmetric cross-sections, making the section under compressive stress smaller than the section under tensile stress.
4) When planning cast iron structural castings, the wall thickness should not be too thin, and the corners should be appropriately thickened to prevent white mouth formation, which makes the area hard and brittle and difficult to machine.
5) Cast iron has very little plasticity, so it cannot be corrected like cast steel after deformation. Therefore, when planning gray cast iron structures, it is advisable to follow the principles of simultaneous solidification and choose symmetrical structures. Design the structural members and wall thicknesses to be freely shortened, in order to prevent 1) deformation cracks in castings.