1. The deformation of the casting mold causes the deformation of the cast iron surface plates; 　　

2. The environment of the casting mold causes the deformation of the cast iron surface plates, such as the inclined or uneven ground on which the casting mold is placed;

3. Irregular casting process leads to deformation of cast iron surface plates;

4. The sudden change of the external environment during the casting of the cast iron surface plates causes the cast iron platform to deform, for example, the temperature sudden heat and rapid cooling causes the cast iron platform to be unevenly cooled and deformed;

5. The casting stress generated during the cooling process of the cast iron surface plates exceeds the yield strength of the material at that temperature, resulting in residual deformation;

6. Improper use of the cast iron surface plates causes deformation. In the application, the lifting capacity of the platform exceeds the load-bearing capacity of the platform. For example, collision, crushing, beating, etc. may cause deformation of the platform; 　

7. Improper maintenance and storage of the cast iron surface plates may cause deformation, such as placing other heavy objects on the platform during storage. In order to prevent the cast iron platform from deforming and maintain the accuracy, it is necessary to take regular maintenance and frequent maintenance by scraping personnel to test the accuracy of the cast iron platform. Maintenance work is necessary.

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