For centrifugal casting manufacturers, in addition to sunken roll surfacing, there are other products, such as Hitachi crawler bottom rolls. Today, I will take you to understand the cause of damage to the bottom roller of Hitachi crawler crane.
1. What is the manifestation of surface damage to the bottom roller of Hitachi crawler crane?
If the surface of the bottom roller of the Hitachi crawler crane is damaged, in terms of the form and performance of the bottom roller of the Hitachi crawler crane, there are mainly the following:
Form 1: Hitachi crawler crane bottom roller surface crack
There are normal and abnormal spots on the surface of Hitachi crawler crane bottom roller. Normal cracks are caused by thermal stress, usually on the surface of Hitachi crawler bottom rollers, while abnormal cracks are mainly thermal shock cracks, which are ductile cracks.
Form 2: Indentation
The reason is the continuous or discontinuous distribution of foreign matter on the roller surface during the production process, and there are no regular pits.
Form three: peeling off the oxide film
If a layer of oxide film is formed on the surface of the roller, if the Hitachi crawler bottom roller is insufficiently cooled or other reasons, the oxide film will deteriorate and cause the problem of shedding. The Hitachi crawler bottom roller surface will have defects and increase the Hitachi crawler bottom. The amount of roller wear.
2. What is the material of the bottom roller of Hitachi crawler crane?
The bottom roller material of Hitachi crawler crane is cast iron material or high-grade chilled cast iron material in China. However, due to its shortcomings, it was not used instead of ductile iron to increase its life. In foreign countries, it is semi-steel or high-hardness special semi-steel.
