Din 15070 17
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What is Din 15070 17 and why is it important for crane rail wheels
Din 15070 17 is a standard that specifies the basis of calculation for crane rail wheels. Crane rail wheels are used to support and move heavy loads on rails, such as in cranes, gantries, or transfer cars. They are subject to high stresses and wear due to the contact with the rail, the load, and the speed.
The standard Din 15070 17 defines the symbols and units, the load cases, the stress analysis, the fatigue strength, and the service life of crane rail wheels. It also provides tables and formulas for calculating the material coefficient, the speed coefficient, the operating time coefficient, and the wheel diameter. These factors affect the performance and durability of crane rail wheels.
By following the standard Din 15070 17, crane rail wheel manufacturers can ensure that their products meet the quality and safety requirements of their customers. The standard also helps customers to select the appropriate crane rail wheels for their applications and to estimate their maintenance costs.
One of the main challenges of crane rail wheels is to withstand the wear caused by the friction and abrasion between the wheel and the rail. The wear can reduce the wheel diameter, increase the rolling resistance, and affect the alignment and stability of the crane. To prevent excessive wear, crane rail wheels need to have a high hardness and a good resistance to cracking and spalling.
The standard Din 15070 17 recommends a minimum hardness of 300 HB for crane rail wheels. However, some manufacturers offer higher hardness levels, such as 350 HB or 400 HB, to increase the wear resistance and service life of their wheels. For example, Xtek Crane Wheels are manufactured from fine grain, fully killed, vacuum degassed forged medium carbon steel and heat treated using their in house processes to provide a uniform contour hardness in the tread and inner flange wear surfaces, while maintaining a ductile core to resist shock loads.
Another challenge of crane rail wheels is to cope with the dynamic loads and stresses that result from the acceleration, deceleration, and braking of the crane. These loads and stresses can cause fatigue damage and cracks in the wheel material, leading to failure and accidents. To prevent fatigue damage, crane rail wheels need to have a high strength and a good resistance to cyclic loading.
The standard Din 15070 17 provides formulas for calculating the fatigue strength and the service life of crane rail wheels based on the load cases, the stress analysis, and the material properties. It also provides tables for selecting the appropriate material coefficient, speed coefficient, and operating time coefficient for different types of crane rail wheels. These coefficients reflect the influence of the material quality, the speed range, and the operating time on the fatigue strength and service life of crane rail wheels.
In conclusion, crane rail wheels are essential components of cranes and other rail-based systems that are used to transport heavy loads. They are exposed to high loads, stresses, and wear that can affect their performance and safety. The standard Din 15070 17 provides a comprehensive framework for calculating and designing crane rail wheels that can meet the quality and safety requirements of their customers. By following the standard Din 15070 17, crane rail wheel manufacturers and customers can ensure that their products have a high hardness, strength, fatigue resistance, and service life. 061ffe29dd