**Bearing Ferrule Grinding and Superfinishing: New Skills and Developments (1)**
Home > Bearing Knowledge > New Skills and Development of Bearing Ring Grinding and Superfinishing (1)
Source: Bearing Network | Time: May 1, 2013
---
Grinding and superfinishing are essential processes in the production of mechanical components, especially in the bearing industry. These operations are typically the final steps in manufacturing, directly impacting the quality, performance, and lifespan of the product. In bearings, the grinding of the ferrule is a crucial step that determines the accuracy of the entire bearing. Similarly, the superfinishing of the raceway surface significantly affects the bearing’s durability, noise levels, and vibration control.
In the foreign bearing industry, by the 1960s, a stable process for ferrule grinding and superfinishing had been established. This included double-face grinding, centerless cylindrical grinding, raceway cutting, and subsequent superfinishing. Most bearings were processed using this method, and although the basic process remained unchanged for decades, significant improvements in technology and automation have continued to evolve.
In the 1960s, the "double-end centerless grinding and superfinishing" process was introduced, along with specialized machines that achieved part machining accuracy of 3–5 micrometers with processing times between 13–18 seconds. By the 1970s, high-speed grinding at 60 m/s became common, accompanied by improved control systems and digital electronics. This led to higher precision, reaching 1–3 micrometers, and faster processing times of 10–12 seconds.
In the 1980s, the focus shifted towards increasing productivity while maintaining quality. The introduction of numerical control (NC) and automated systems allowed for more efficient and flexible production. High-speed spindles, advanced grinding wheels, and better cooling systems became standard features in modern grinding equipment.
---
**High-Speed Grinding Technology**
High-speed grinding has become a key technique in improving both product quality and production efficiency. Increasing the grinding speed from 35 m/s to 50–60 m/s can boost productivity by 30–60%, extend grinding wheel life by up to 1.7 times, and reduce surface roughness by about 50%.
Grinding speeds of 45 m/s or higher are classified as high-speed grinding. For example, the ZYS 811 automatic internal grinding machine developed in the 1980s was one of the first in China to apply this technology. It featured a high-rigidity, high-speed, and high-power electric spindle, as well as high-speed grinding wheels.
Today, high-speed grinding is widely used globally, often combined with CBN (Cubic Boron Nitride) abrasives, which offer superior hardness, thermal conductivity, and wear resistance. Grinding speeds have reached 80–120 m/s, with some machines even exceeding these limits. Companies like Mikrosa (Germany), KOYO (Japan), and TOYO (Japan) use such advanced technologies in their centerless and internal grinding machines.
To achieve high-speed grinding, it's essential to enhance the power of the grinding wheel drive system and improve the rigidity of the machine tool. Additionally, effective cooling systems are critical for maintaining performance and prolonging tool life.
---
**CBN Grinding Wheel Technology**
CBN grinding wheels, made from cubic boron nitride abrasive, offer several advantages over traditional corundum wheels. They have:
1. **High Hardness and Thermal Stability**: CBN can withstand temperatures up to 1300–1500°C.
2. **Longer Life**: CBN wheels have a grinding ratio of 4,000–10,000, compared to just 50–80 for conventional wheels.
3. **Low Grinding Force**: Reduces wear on both the workpiece and the wheel.
4. **Easy Dressing and Replacement**: Requires less frequent maintenance.
In China, the use of CBN wheels for ferrule grinding is still emerging but holds great potential. Challenges include developing CBN wheel manufacturing techniques, optimizing finishing processes, and improving coolant systems for specialized bearing grinding machines.
CBN grinding has already revolutionized the industry abroad, particularly in Japan, where its use has grown rapidly since 1982.
---
**Related Bearing Knowledge**
- Noise Characteristics and Countermeasures of Motor Bearings
- SKF Bearings: The Influence of Clearance on Bearing Life
- Discussion on the Processing of Imported Bearing Cages
- How to Improve the Quality of Cylindrical Roller Bearings
This article is linked to http://
Please indicate China Bearing Network http://
Previous: NTN Bearing Inner Packaging Method and Data Requirements
Next: TIMKEN Thrust Bearing Inspection Method Analysis
Aluminum Door Handle On Iron Plate
Aluminum Door Handle On Iron Plate,Aluminum Handle Iron Plate,Simple Iron Bathroom Handle,Plate Lever Door Handle
Wenzhou Shenghong Metal Products Co.,Ltd , https://www.shenghonglock.com