Rolling bearings are also a kind of commonly used mechanical hardware products. They need to be lubricated continuously during use to ensure their normal work. So what are the main purposes of rolling bearing lubrication? What are the methods of lubrication treatment? Today, the editor will organize the following for you, hoping to help more people have an understanding and understanding of this type of bearing!
The main purposes of rolling bearing lubrication are:
1. Reduce friction and wear: In the mutual contact parts of the rings, rolling elements and retainers that constitute the bearing, prevent metal contact and reduce friction and wear.
2. Extend the fatigue life: The rolling fatigue life of the bearing will be extended when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the lubricating oil film thickness is not good, it will be shortened.
3. Discharge friction heat and cooling: the circulating oil supply method can use oil to discharge the heat generated by friction, or the heat from the outside, and cool it. Prevent the bearing from overheating and prevent the aging of the lubricating oil itself.
4. Others: It also has the effect of preventing foreign objects from invading the inside of the bearing, or preventing rust and corrosion.
The main methods of rolling bearing lubrication:
At present, the lubrication methods of bearings mainly include grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to choose a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication.
Method of manufacturing rolling bearing
Do you know how to manufacture rolling bearings? Although there are many types of rolling bearings, there are differences in their structural types, public service grades, material selection, and processing methods, but their basic manufacturing processes include the following.
Bearing parts manufacturing – bearing parts inspection – bearing parts demagnetization, cleaning, rust prevention – bearing assembly – bearing products inspection – bearing products demagnetization, cleaning – bearing products oiled packaging bucket products storage.
The ring is the main part of the rolling bearing. Because of the variety of rolling bearings, the ring size, structure, manufacturing equipment and process methods of different types of bearings are different. And because the ferrule has many processing procedures, complex technology and high processing accuracy requirements, the processing quality of the ferrule has a major impact on the accuracy, service life and function of the bearing.
The raw material of the ring manufacturing is cylindrical bar material or tube material. At present, according to the different forming processes, rolling bearing rings generally have the following manufacturing processes.
1) (bar) blanking – forging – annealing (or normalizing – turning (cold rolling) – heat treatment quenching, tempering – grinding – parts inspection – demagnetization, cleaning – submit assembly
2) (bar, tube) blanking – cold rolling forming – heat treatment quenching, tempering – grinding – parts inspection – demagnetization, cleaning – submit assembly
3) (tube material) blanking – turning forming – heat treatment quenching, tempering – grinding – parts inspection – demagnetization, cleaning – submit assembly
4) (bar material) blanking – cold (warm) extrusion – turning – heat treatment quenching, tempering – grinding – parts inspection – demagnetization, cleaning – submit assembly
Ring forming method
At present, in the ferrule processing, the forming methods mainly include the following: forging forming, turning forming, cold rolling forming and cold (warm) extrusion forming. Among the above forming methods, forging forming processing is the most common, accounting for about 80% of the total output. For some small general-purpose products, rods (tubes) can be used for direct turning forming. Since the 1980s, some small and medium-sized enterprises in my country have adopted cold rolling and cold (warm) extrusion molding processes in the production of small and medium-sized ferrules.
1) Forging forming
The forging process can eliminate the internal defects of the metal, improve the metal structure, make the metal streamline distribution reasonable, and the metal tightness is good. The forging forming process is generally used in the bearing forming process, which can complete the processing from small products with an inner diameter of ~20mm to extra large products with an outer diameter of 5000mm. Common forging forming methods are: hot forging, cold forging and warm forging. In my country, hot forging is the main method.
Hot forging is divided into: free forging process, press forging process, flat forging process and high-speed upsetting machine forging process due to different forming and processing equipment.
2) Cold rolling forming
The cold rolling process is an advanced process method that can improve the utilization rate of materials, improve the density of metal structure, and maintain the linearity of metal flow. It is a chip-free processing method. In theory, the cold rolled product can be directly heat treated and ground without turning. At present, the cold rolling process is mainly used for medium and small deep groove ball bearings. The main process is as follows:
Forging blank (ring) – turning (except for channel) – rolling (groove and chamfering) full diameter – soft grinding of both ends
When using the cold rolling process and the forging forming process, the accuracy of the product is not only affected by the accuracy of the equipment, but also by the accuracy of the forming die.
3) Turning and forming
In the bearing industry, the traditional turning and forming skills are to use a special lathe to complete the forming process using a centralized process method. However, due to the difficulty of adjustment of the equipment used in this method, the low precision of the machine tool, and the low utilization rate of materials, this process method is being reduced.
With the development of scientific technology, CNC turning machine tools develop rapidly and become more and more perfect. At present, some products with complex shapes and high precision requirements are increasingly using CNC turning forming skills.
In summary, the direction of ferrule forming processing should be towards the direction of high application rate of metal materials, high production efficiency, and high forming accuracy. Therefore, high-speed upsetting technology, cold rolling technology, and CNC turning forming technology will be used more and more.
