In the field of precision measurement, the length measuring machine is a key device for ensuring the dimensional accuracy of products, and the performance of its base material directly affects the stability and service life of the equipment. In recent years, an increasing number of length measuring machines have begun to use granite as the base material. One of the important reasons for this is the outstanding fatigue strength of granite. Experimental data show that the fatigue strength of granite material is seven times higher than that of cast iron. This significant advantage provides a strong guarantee for extending the service life of the base of the length measuring machine.
To verify the difference in fatigue strength between granite and cast iron, the research team conducted a series of rigorous experiments. The experiment selected samples of granite and cast iron bases of the same specifications and under the simulation conditions of the same working conditions. Through the fatigue testing machine, periodically changing loads are applied to the base samples of two materials to simulate the external forces such as vibration and pressure that the length measuring machine is subjected to during long-term use. During the experiment, the microstructure changes, surface damage conditions and the degree of degradation of macroscopic mechanical properties of the material after each loading cycle were precisely recorded.
After a large number of loading loop experiments, the results are remarkable. Obvious fatigue cracks appeared in the cast iron base samples after a relatively small number of loading cycles. As the number of cycles increases, these cracks continuously expand and converge, resulting in the destruction of the structural integrity of the material and a significant decline in its mechanical properties. However, the granite base samples began to show extremely fine microscopic cracks only after undergoing loading cycles several times that of cast iron, and the crack propagation speed was extremely slow. From a macroscopic perspective, the degree of mechanical property degradation of granite bases is much lower than that of cast iron bases. Through professional data analysis and calculation, it was ultimately concluded that the fatigue strength of granite material is seven times higher than that of cast iron.
The reason why granite materials have such high fatigue strength is closely related to their internal structure and mineral properties. Granite is an igneous rock formed by the close combination of various mineral crystals. The mineral particles inside it interlock with each other, forming a dense and stable structure. This structure enables granite to evenly disperse stress when subjected to external forces, reducing the phenomenon of local stress concentration, thereby effectively delaying the generation and expansion of fatigue cracks. In contrast, there are some microscopic pores and impurities inside cast iron. These defects become the "breeding ground" for fatigue crack initiation. When subjected to external forces, they are prone to cause stress concentration and accelerate the fatigue failure of the material.
For the length measuring machine, the high fatigue strength of the granite base means that during long-term use, the stability and accuracy of the structure can be better maintained. The measurement error caused by the fatigue deformation of the base has been reduced, and the reliability of the measurement results has been improved. Meanwhile, as the granite base is less prone to fatigue damage, it significantly reduces the maintenance frequency and replacement cost of the equipment, and greatly extends the overall service life of the length measuring machine.
In today's manufacturing environment where the precision requirements for products are increasingly strict, the stability of the performance of the length measuring machine, as a key equipment for quality control, is of vital importance. Granite material, with its fatigue strength far exceeding that of cast iron, provides a better choice for the design and manufacture of the base of the length measuring machine, becoming an important secret to extending the service life of the base of the length measuring machine and ensuring the accuracy of precise measurement. It is bound to play a greater role in promoting the development of precision measurement technology.
Post time: May-13-2025