Carbide band saw blade is a new type of saw blade invented in the 1960s, welded by the back spring steel and tooth carbide, the main processing technology flow is: welding, annealing, milling, washing, tooth splitting, quenching, tempering, sandblasting. Carbide band saw blade is a highly technical, new type of sawing metal products, which is characterized by high hardness, high strength, with high red hardness, high sawing precision. At present, the global market application of high-end carbide band saw blades are all products outside of China (such as Wikus, Bahco, Amada, etc.), China's production of carbide band saw blades are mostly concentrated in the middle and low-end products, the fatigue performance of the band saw blade backing material is far lower than abroad. Chinese enterprises need to overcome the difficulties, research and development and mass production of high-end carbide band saw blades with excellent fatigue resistance.
At present, in the carbide band saw blade industry, foreign countries have formed a market mechanism for market segments, the introduction of more personalized products.
However, for high-speed sawing of non-ferrous metals, China's carbide band saw blade manufacturing capacity is still a bottleneck, such as the backing material composition and the relationship between the tension tolerance, band saw blade fatigue rupture failure of the critical residual stress and the relationship between the tension and the change in the residual stress is still not clear, the band saw blade of the heat treatment and surface enhancement of the fatigue performance of the impact of the research is also relatively lagging behind. Make the actual sawing band saw blade sawing tension with inappropriate, easy to lead to the band saw blade back material early fatigue fracture, failed to give full play to the maximum efficiency of the band saw blade, but also make the sawing performance of carbide band saw blade and foreign similar products there is still a certain gap. At present, the high-speed cutting of non-ferrous metals band saw blade market is basically occupied by the German brand Wikus. In order to narrow the gap with foreign products, researchers need to carry out some basic research around the domestic carbide band saw blades.
In the many processes of band saw blade manufacturing, the heat treatment of the backing material is a key link in determining the fatigue performance of the band saw blade, different materials and their compositions need to use different heat treatment processes, and mastery of the performance of domestic cemented carbide band saw blades backing material and foreign products related to the data is to realize the key step in the manufacture of high-end band saw blade products.
Domestic BE100 and Wikus two kinds of cemented carbide band saw blade backing material as the research object, using optical microscope, scanning electron microscope (SEM), X-ray diffractometer (XRD) and Vickers hardness tester to study the backing material of the microstructure, the physical phase and hardness, the use of tensile testing machine and fatigue testing machine to test its tensile and fatigue properties, comparative research on the two kinds of backing material microstructure and mechanical properties. The microstructure and mechanical properties of the two backing materials were comparatively studied.
The results show that: the main components of the two backing materials, Fe, Cr and Ni, exist in single-phase solid solution, and the carbides formed in the backing materials are amorphous; compared with the BE100 backing material, the Wikus backing material adopts the heat treatment process of high-temperature quenching and low-temperature tempering, which produces the effect of martensitic solid solution strengthening and obtains higher hardness; the microstructures of the BE100 and the Wikus backing materials consist of tempered The microstructures of BE100 and Wikus backing materials are composed of tempered austenite and tempered flexure, respectively, and the uniformity of microstructure of Wikus backing material is better; the plasticity of BE100 backing material is better than that of Wikus backing material at the initial stage of tensile stretching, but is lower than that of Wikus backing material with the increase of strain to 10%, and the necking phenomenon occurs sooner in BE100 backing material than that of Wikus backing material; moreover, the fatigue stability of Wikus backing material is better than that of BE100 backing material.
