Home>Bearing knowledge>The development of NSK bearings is based on the application of new wear-resistant materials

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The development of NSK bearings is based on the use of new wear-resistant materials

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The development of nsk bearings has always been based on the application of new wear-resistant materials. The high-manganese steel first proposed in 1882; after water tough treatment; under the high impact load and high kneading stress, due to the deformation of the twin crystal The surface is hardened by work; the microhardness is up to HV750; and the core still adheres to excellent impact resistance. It is applied to the squat type of tooth plate; the moving cone of cone, fixed cone and hammer type; Wear-resistant materials. It is not used in low-impact loads or low-stress applications. The Tox bearing is based on two aspects of product skill and quality; the information on the equipment produced is gradually updated. In order to bring the imported equipment parts into the country; The anti-wear parts in the machine have been repeatedly researched and trial-produced. The production operation experiment; the use of the anti-wear alloy developed by the accessories is suitable for the service life and imported products; it can completely replace the imported accessories. Follow the development of nsk bearing machinery; More and more puzzles come out; for example, the expansion of the fracture category and the durability of the equipment; the continuous development of the profession puts forward a higher demand for wear-resistant materials. Hard nickel presented around 1930 Iron; hardness up to HRC55-60; as the second generation of wear-resistant materials; because it is too brittle; it can only make small parts; such as spiral blade plate of sand washing machine; and China's nickel is expensive; so the application is very small. The high-grade cast iron presented in the hard nickel cast iron in the past few years is called the third-generation wear-resistant material; on its strong martensitic matrix; the sturdy bulk primary carbide and a certain amount of diffuse fine secondary carbonization When the chromium content exceeds 10%; the carbide is in the form of (Fe,Cr)7C3. Its microhardness is as high as HV1300-1800. Currently it is mainly used for counterattack hammers and vertical shafts. High chromium Cast iron is divided into three types: Cr15, Cr20 and Cr26 according to the chromium content; low chromium content is relatively good at low price and high resistance; counterattack hammer; most domestic manufacturers use Cr20; while foreign countries use Cr26.
Tokes bearings learn advanced foreign skills; in the production of some high-end equipment (VAI new sand making machine; hydraulic cone nsk bearing; JCE European version of the nsk bearing, etc.); selected and imported high wear-resistant materials; with alloy content High, good fluidity, large amount of shortening, poor thermal conductivity, etc.; therefore, when describing the casting process, adopt the principle of order condensation; and increase the feeding effect of the riser on the casting; impact hammer, counterattack and other thickness Casting method for large castings using vertical pouring rainproof riser. The disadvantage of high chromium cast iron is hard brittleness and high price. The current research on new wearable materials is ongoing. It is known that: high tolerance Martensitic cast steel, multi-component low-alloy air-cooled martensite-bainite cast steel, high-strength resistant austenitic-bainitic steel, etc.; expected to become a new generation of wear-resistant materials; once these new materials are used and applied Will promote the nsk bearing, especially the anti-impact nsk bearing and impact nsk bearing with strong dependence on wear-resistant materials.

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