Wear resistance of large steel castings
The hardness of large steel castings is the main reason affecting wear. Generally, the hardness of steel castings is higher than that of abrasives to obtain higher wear resistance. The hardness of large steel castings is more the hardness of wear-resistant working surfaces after wear than the initial hardness before wear. The higher the hardness is, the better it is, because in some specific conditions, too high a hardness will also lead to cracks.
In general industrial production, large steel castings with strong wear resistance are mainly accessories made of raw materials. In processing, they are all made by pouring, so they are endowed with greater strength, stiffness, plasticity, etc. It is necessary to control the casting process to prevent inaccurate positioning or bubbles. Large steel castings can produce many kinds of castings according to different materials.
For example, it can be processed into the body of a large press or hydraulic press, because the upper crossbeam, column, lower crossbeam, slider and other large pieces that make up the body can be processed separately, which is also conducive to organizing production and controlling welding quality, and can also solve the difficulties in the transportation of the whole machine. The column of the press supports the weight of the upper machine parts and bears the pressure of the tension bolt. It is also the track for the movement of the slider. The column is a compression part, which can be welded with a thicker steel plate to maintain local stability and sensibility.
Wear is the direct failure mode of large steel castings, especially in the case of abrasive wear, because the abrasive and other factors affect the wear-resistant steel casting material will gradually loss until failure.