In industrial high-temperature and high-speed production scenarios, a large number of core equipment needs to operate continuously under harsh working conditions of high rotation speed, continuous high temperature, hot air baking and non-stop operation for a long time. Restricted by ordinary carbon steel materials, conventional heat treatment technology, general lubricating grease and extensive structural design, ordinary standard bearings have poor high-temperature resistance. The friction heat generated by high-speed operation superimposed with ambient high temperature easily causes rapid temperature rise, material thermal softening, structural thermal expansion, raceway deformation and warping. Short-term operation will lead to failures such as high-temperature carbonization of lubricating grease, oil film rupture and failure, metal dry friction abnormal noise, high-speed jitter and eccentricity, and operation stalling; long-term high-temperature and high-speed operation will directly cause permanent thermal deformation of bearings, raceway scratching, steel ball wear and peeling, bearing jamming and locking, and whole machine shutdown paralysis. It not only seriously reduces equipment production efficiency, but also causes a series of industrial problems such as frequent parts replacement, high-frequency maintenance, soaring production costs and high equipment failure rate.

Most ordinary high-speed bearings and conventional high-temperature resistant bearings on the market generally have obvious shortcomings: ordinary high-speed bearings have high rotation speed but poor heat resistance, and grease drying carbonization, increased wear and rapid precision attenuation will occur in environments above 80℃; ordinary high-temperature resistant bearings have heat-resistant materials but rough technology and large raceway friction resistance, which cannot support long-term high-speed operation, and are prone to excessive heat generation, increased vibration and greatly reduced service life under high-speed working conditions. Both types of conventional bearings cannot meet the four strict requirements of "high rotation speed + high temperature resistance + deformation resistance + long-term wear resistance" at the same time. In hard-core working conditions such as drying and curing, industrial baking, heat treatment processing, high-speed hot air motors and high-temperature assembly lines, bearing burnout, deformation, jamming and premature failure frequently occur, becoming the biggest shortcoming in the stable operation of high-temperature and high-speed equipment.

Aiming at the core industry pain points of traditional bearings, including easy temperature rise at high speed, easy deformation at high temperature, easy jamming in hot state, easy carbonization of lubrication, large high-speed wear and short high-temperature service life, NMT has been deeply engaged in the field of high-temperature and high-speed bearings for many years. Relying on Japanese high-temperature material research and development system and high-speed precision processing technology, it has iteratively upgraded the new series of high-speed high-temperature resistant long-life bearings. It has achieved all-round breakthroughs and optimization from six core dimensions: special heat-resistant alloy materials, high-temperature stable heat treatment, high-speed low-resistance super-precision technology, exclusive clearance adapted to thermal expansion, high-temperature anti-carbonization lubrication and heat-resistant fastening sealing structure, building an integrated industrial transmission solution of low heat generation at high speed, no deformation at high temperature, no jamming under heat resistance and long-term wear resistance suitable for various harsh working conditions of high temperature, high speed, continuous operation and hot air baking.

In terms of materials, all NMT high-speed high-temperature resistant bearings adopt imported special heat-resistant alloy steel substrates. Different from ordinary carbon steel of common bearings, they undergo multiple vacuum refining, homogenization smelting and deep impurity filtration. The steel has dense and stable internal metallographic structure, strong high-temperature stress resistance and extremely low thermal expansion coefficient. Meanwhile, it adopts exclusive high-temperature quenching + multiple constant-temperature tempering stabilization processes to completely eliminate residual internal stress of materials, greatly improve the high-temperature hardness, thermal stability and creep resistance of materials. It can withstand long-term normal high-temperature working conditions of 180℃-280℃ and short-term higher temperature impact. There will be no material softening, hardness attenuation, structural creep or thermal deformation in high-temperature environments, always maintaining stable mechanical strength and wear resistance, fundamentally solving the fatal defects of ordinary bearings such as high-temperature softening, high-speed wear and permanent deformation.

In terms of process accuracy, the product adopts exclusive low-resistance super mirror-finishing technology for high-speed working conditions, which is precisely optimized for the problems of friction heat generation during high-speed operation and high-temperature raceway loss. The inner and outer ring raceways of bearings undergo multiple ultra-fine polishing, curved surface symmetry correction and low-resistance finishing treatments, with extremely smooth inner walls and accurate and regular arc curves, greatly reducing the friction resistance coefficient. The low-resistance raceway structure can effectively reduce rolling friction heat during high-speed operation, inhibit temperature rise accumulation, and avoid oil film rupture and dry wear caused by superposition of high speed and high temperature. At the same time, ultra-high roundness and concentricity accuracy can ensure stable rolling track, balanced stress and no eccentric jitter of steel balls at high speed, eliminating high-speed resonance, thermal vibration and operation offset, realizing long-term precise and stable operation under dual working conditions of high speed and high temperature.

In terms of structural clearance, NMT innovatively adopts a high-temperature thermal expansion adaptive clearance system. According to the law of metal thermal expansion in high-temperature environments and the deformation characteristics of high-speed operation, it accurately calibrates the exclusive enlarged clearance range, perfectly offsetting the structural stagnation problems caused by high-temperature thermal expansion and high-speed extrusion. It not only solves the common problems of thermal expansion jamming and high-speed friction locking of ordinary standard clearance at high temperature, but also avoids high-speed shaking, vibration abnormal noise and reduced transmission accuracy caused by excessive clearance. It is precisely adapted to high-temperature static placement, continuous high-speed operation and alternating cold and hot working conditions, ensuring that the bearing operates smoothly without jitter and stably under high-temperature and high-speed conditions.

In terms of cage and structure, all series are upgraded with high-strength heat-resistant cages, integrally formed with special high-temperature resistant, aging-resistant and high-rigidity materials and stabilized by high-temperature shaping treatment. They are not easy to deform or loosen in high-temperature environments, and will not generate thermal expansion clearance. They can accurately constrain the high-speed operation track of steel balls and eliminate clutter and wear caused by high-speed steel ball shifting and collision friction. The cages have excellent high-temperature creep resistance and high-temperature aging resistance, without deformation, damage or falling off during long-term continuous high-temperature and high-speed operation. Their structural stability is far better than that of ordinary stamping and injection molded cages, providing strong structural support for long-term operation of bearings at high speed and high temperature.

In terms of lubrication system, it is equipped with imported industrial-grade special high-temperature anti-carbonization lubricating grease, adopting an exclusive formula of high temperature resistance, oxidation resistance, carbonization prevention and low volatilization, with excellent characteristics of no volatilization at high temperature, no coking at high heat, no long-term carbonization and no oil throwing at high speed. It can form a tough and stable heat-resistant oil film on the high-temperature high-speed friction surface, continuously isolating metal friction, buffering high-speed vibration and inhibiting temperature rise accumulation, eliminating the common problems of ordinary lubricating grease such as high-temperature drying, coking carbon deposition, oil film failure and dry wear. Even in long-term continuous high temperature, ultra-high speed operation and hot air purging working conditions, it can still maintain excellent lubrication performance, protect bearing raceways and steel balls for a long time, and greatly extend the service life under high-temperature working conditions.

In terms of sealing protection, it adopts a heat-resistant and aging-resistant reinforced sealing structure with special high-temperature resistant sealing rubber rings and dust-proof heat-resistant cover plates. It can withstand continuous high-temperature baking and hot air erosion. The sealing parts are not easy to soften, deform, age and fail at high temperature, always maintaining a tight fitting state. It can effectively block the invasion of high-temperature dust, hot air impurities and oxidized particles into the bearing, avoiding high-temperature carbon deposition, dust wear and internal oxidative corrosion, locking the clean internal lubrication environment, and comprehensively improving the durability and stability under high-temperature and high-speed working conditions.

In terms of overall performance, NMT high-speed high-temperature resistant bearings have passed multiple strict verifications including high-temperature durability test, continuous high-speed operation test, alternating cold and hot impact test, high-temperature deformation resistance test and high-temperature lubrication stability test. They have excellent temperature rise control, outstanding thermal deformation resistance, stable high-speed operation and strong high-temperature wear resistance. Their service life is 3-5 times that of ordinary high-speed bearings and ordinary high-temperature resistant bearings, which can perfectly replace imported high-end high-speed high-temperature resistant bearings and adapt to various industrial high-temperature and high-speed hard-core working conditions.

Core Advantages

1. Special heat-resistant alloy substrate with stable high-temperature strength: Made of vacuum-refined high-temperature resistant alloy steel with strong thermal stability and low thermal expansion coefficient, it will not soften, creep or attenuate in hardness at high temperature, eliminating high-temperature deformation failure from the material source.

2. Low-resistance super-precision mirror process with low heat generation at high speed: The exclusive low-friction raceway for high speed has minimal friction resistance, low heat generation and slow temperature rise during high-speed operation, effectively avoiding oil film damage and dry wear loss caused by superposition of high speed and high temperature.

3. High-temperature adaptive exclusive clearance with anti-jamming and anti-locking performance: Optimized clearance precisely matched with high-temperature thermal expansion characteristics offsets metal thermal expansion deformation, completely solving jamming and stalling failures under high-temperature and high-speed working conditions for smoother operation.

4. High-strength heat-resistant cage with no structural deformation: The high-rigidity integrally formed heat-resistant cage resists high-temperature creep and high-heat aging, with strong constraint during high-speed operation, no shifting, no loosening and no structural deformation.

5. High-temperature anti-carbonization lubrication with long-term non-coking performance: Imported special high-temperature resistant lubricating grease does not volatilize, carbonize or coke at high temperature, forms stable films continuously, and eliminates high-temperature dry wear to protect bearing friction pairs for a long time.

6. Dual adaptation of high speed and high temperature with extremely low operation cost: It meets the dual strict requirements of high rotation speed and high temperature resistance at the same time, with wide working condition adaptability and long durable life, greatly reducing equipment shutdown maintenance and frequent replacement costs under high-temperature conditions.

Application Scenarios

NMT high-speed high-temperature resistant bearings are accurately adapted to various industrial harsh working conditions of continuous high temperature, high-speed operation, hot air baking, alternating cold and heat and non-stop continuous operation, covering six core fields: high-temperature motor equipment, industrial drying and baking equipment, heat treatment processing machinery, hot air circulation equipment, high-temperature assembly line equipment and industrial high-temperature precision transmission. In the high-temperature motor field, they are suitable for high-speed high-temperature variable frequency motors, hot air motors, oven special motors, industrial high-temperature motors and continuous operation high-speed motors, solving motor failures such as high-speed temperature rise, high-temperature abnormal noise and bearing burnout. In the industrial drying and baking field, they adapt to industrial drying lines, food baking equipment, hardware paint curing equipment, hot air drying machinery and constant-temperature baking equipment, withstanding long-term hot air high-temperature baking and continuous non-stop operation. In the heat treatment field, they apply to annealing equipment, quenching auxiliary transmission machinery, high-temperature heat treatment assembly lines and hot forming equipment transmission parts, adapting to hard-core high-temperature processing working conditions. In the hot air circulation field, they fit industrial hot air blowers, high-temperature wind wheels, hot air circulation units and high-temperature ventilation transmission equipment, operating at high speed without heat generation, aging or deformation. In the high-temperature assembly line field, they adapt to high-temperature conveying assembly lines, curing conveying equipment, heat treatment conveying machinery and constant-temperature processing transmission modules, withstanding alternating cold and heat and continuous high-temperature load operation. In the high-temperature precision transmission field, they are suitable for various industrial high-temperature high-speed precision transmission mechanisms, high-temperature automation equipment and high-temperature test instrument transmission parts, ensuring accurate and stable transmission under high-temperature working conditions. All industrial equipment with working conditions of high-temperature heat, high-speed continuous operation and hot air erosion can be adapted for long-term stable and durable operation.

Quality Assurance

NMT high-speed high-temperature resistant bearings strictly follow Japanese industrial high-temperature bearing precision quality control standards and establish an exclusive high-temperature and high-speed detection system to strictly control quality throughout the whole process. Before warehousing, raw materials are subject to one-by-one high-temperature resistance detection, metallographic thermal stability analysis, high-temperature hardness test and thermal expansion coefficient detection to eliminate inferior substrates with poor heat resistance, insufficient thermal stability and uneven materials. The whole production process adopts exclusive precision processes for high-temperature and high-speed bearings, including vacuum refined forging, multiple high-temperature stress relief, constant-temperature tempering stabilization treatment, high-speed low-resistance super-finishing grinding, high-temperature clearance precise sorting, precise adaptation of heat-resistant cages, quantitative oiling of high-temperature lubricating grease, pressure fitting of heat-resistant seals and dust-free precision assembly, with each process meeting the standards of imported high-end industrial high-temperature bearings. All finished products undergo 100% full inspection before delivery, including continuous high-temperature durability test, continuous high-speed operation temperature rise test, alternating cold and hot impact test, high-temperature deformation stability test, high-temperature lubrication anti-carbonization test and load high-speed stability test, layer by layer eliminating defective products with easy deformation at high temperature, easy heat generation at high speed, easy lubrication failure and unstable operation. All delivered bearings have excellent performance of low heat generation at high speed, no deformation at high temperature, heat and wear resistance and long-term stability, which can perfectly replace imported high-speed high-temperature resistant bearings and provide solid and reliable long-term transmission guarantee for various industrial high-temperature and high-speed equipment.