The types of NSK Bearings are very widely used, mainly in machinery to support and reduce friction, so the accuracy and noise of NSK bearings are directly related to the use and life of the machinery. Therefore, we need to pay attention to some matters when buying NSK bearings.
1. Selection of NSK bearing model: The NSK bearing model is generally selected by the user's technical staff according to the use conditions and load bearing of the supporting products. Business personnel mainly understand whether the actual load of the user is consistent with the selected NSK bearing. If the NSK bearing cannot meet the requirements for use, it should be recommended to change the model as soon as possible, but unless there are special products in the selection of the model, there will generally be no problems.
2. The choice of NSK bearing clearance: When users buy NSK bearings, merchants generally only tell what type and grade, and rarely ask for NSK bearing clearance. Among them, the speed, temperature, and tolerance of NSK bearings are directly related to the selection of NSK bearing clearance. Generally, motors with a speed below 3500 rpm mostly use CM clearance. For example, high-temperature high-speed motors require a relatively large clearance.
NSK bearing clearance after assembly will be reduced due to the expansion of the inner hole and the shrinkage of the outer circle, the reduction of clearance = interference x60% (except for the NSK bearing chamber is aluminum). For example, the clearance before assembly of NSK bearing is 0.01mm, and the interference during assembly is 0.01mm, then the clearance after assembly of NSK bearing is 0.004mm. In theory, the NSK bearing has the best noise and life at zero clearance, but in actual operation, considering the temperature rise and other issues, the NSK bearing has a clearance of 0.002mm-0.004mm after assembly.
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3. Selection of grease: The selection of grease is generally based on the NSK bearing speed, temperature resistance, noise requirements and aerodynamic torque, etc., and requires us to understand the performance of grease.
4. Selection of NSK bearing sealing form: NSK bearing lubrication can be divided into oil lubrication and grease lubrication. Oil-lubricated NSK bearings are generally selected in the form of NSK bearings, and grease-lubricated NSK bearings are generally sealed with dust caps or rubber seals. The dust cover is suitable for high temperature or good environment. The seals are divided into contact seals and non-contact seals. The contact seals have good dustproof performance but large aerodynamic torque, and the non-contact seals have small aerodynamic torque, but the seal Performance is not as good as contact.
NSK bearings, pure materials, high product accuracy, as many as hundreds of thousands of varieties, are widely used in different environments and machinery, known as the "grain of the machinery industry", NSK has more than 80 years of bearing production experience is still Continuously improve existing products, research and develop new products, and always maintain a leading advantage in technology; with the widespread application of CNC machine tools and machining centers, industrial machinery has entered a new stage of mechatronics. This technological progress is inseparable from NSK bearing products represented by ball screws and linear guides. Its high-precision positioning technology is more prominent in cutting-edge fields such as semiconductor manufacturing equipment and industrial robots.