Ferrule forming process

Manufacturing of Rolling Bearings - Ring Forming Processing

Although there are many types of rolling bearings, their structural types, tolerance levels, material selection, and processing methods are different, but the basic manufacturing process includes the following:

Bearing parts manufacturing - Bearing parts inspection - Bearing parts demagnetization, cleaning, rust prevention - Bearing assembly - Bearing finished product inspection - Bearing finished product demagnetization, cleaning - Bearing finished product oiled packaging bucket finished product storage.

The ring is an important part of the rolling bearing. Due to the wide 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 an important impact on the accuracy, service life and performance of the bearing.

The raw material of the ferrule is cylindrical bar or tube material. At present, according to different forming processes, rolling bearing ferrules 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 - 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 Forming - Turning - Heat Treatment, Quenching, Tempering - Grinding - Parts Inspection - Demagnetization, Cleaning - Submission for Assembly

Ferrule Forming Method

At present, in the ferrule processing, the main forming methods are There are the following types: forging, turning, cold rolling and cold (warm) extrusion. Among the above forming methods, forging forming is the most widely used, accounting for about 80% of the total production. For some small general-purpose products, rods (tubes) can be directly turned to form. 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

Forging can eliminate the inherent 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 widely used in the bearing forming process, and 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 methods are: hot forging, cold forging, and warm forging. In my country, hot forging is the main method.

The hot forging process is divided into: free forging process, press forging process, flat forging process and high-speed upsetting forging process due to its different forming and processing equipment.

2) Cold rolling forming

The cold rolling expansion process is an advanced process method that can improve the utilization rate of materials, improve the compactness of metal structure and maintain the linearity of metal flow. A chipless machining method. In theory, cold rolled products can be directly heat treated and ground without turning. At present, the cold rolling process is mainly used in medium and small deep groove ball bearings. The main process is:

Forging blank (ring) - turning (removing channel) - rolling (groove and chamfering) ) Full diameter - soft grinding both ends

When using cold rolling and forging process, the precision of the product is not only affected by the precision of the equipment, but also by the precision of the forming die.

3) Turning and forming

In the bearing industry, the traditional turning and forming technology is to use a special lathe and use a centralized process method to complete the forming process. However, due to the difficulty in adjusting 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 eliminated.

With the development of science and technology, CNC turning machine tools have developed rapidly and become increasingly perfect. At present, some products with complex shapes and high precision requirements are increasingly using CNC turning forming technology.

In summary, the direction of ferrule forming processing should be towards the direction of high utilization rate of metal materials, high production efficiency and high forming precision. Therefore, high-speed upsetting technology, cold rolling technology, and CNC turning forming technology will be more and more applied.