Product categories of Gearless Traction Machine, we are specialized manufacturers from China, Gearless Traction Machine, Gearless Traction Elevator suppliers/factory, wholesale high-quality products of Gearless Elevator Traction Machine R & D and manufacturing, we have the perfect after-sales service and technical support. Look forward to your cooperation!
Machine power is optional for some machines with AC380V or AC 220V, Please consult us if needed.
Recommended lift travel height: within 60 times of elevator speed.
If exceed the above range, please confirm with our engineer.
Gearless Traction Machine,Gearless Traction Elevator,Gearless Elevator Machine,Gearless Elevator Motor Suzhou Keffran Parts Co.,ltd , https://www.keffran-elevatorsmart.com
**How to Improve the Matching Rate of Cylindrical Roller Bearings**
Home > Bearing Knowledge > How to Improve the Matching Rate of Cylindrical Roller Bearings
Source: Bearing Network | Date: April 3, 2014
Cylindrical roller bearings are known for their high rotational precision, accurate fit, and ability to handle primary radial loads. They are widely used in the spindle support systems of large-scale precision machine tools and finishing equipment. However, due to outdated production processes and traditional machining methods, the qualification rate of these bearings is low—often around 60%. This results in a significant amount of data processing and labor hours, which negatively impacts the economic benefits of the company.
In recent years, this type of bearing has become a leading product in the large-scale bearing division of Luozhou Group Company. Its output value accounts for approximately one-third of the division's total production. To address the challenges and improve efficiency, an improvement plan was implemented focusing on optimizing the "32672" bearing's manufacturing process.
The key improvements include:
1. **Heat Treatment Optimization**: By actively collaborating with the heat treatment plant, deformation during quenching was controlled. Adjustments were made to the raceway retention based on the shortening data provided by the plant, ensuring that the grinding allowance after quenching met the required standards.
2. **Additional Tempering Process**: A tempering step was added after the original processing to eliminate residual stresses and stabilize the raceway dimensions, improving consistency across batches.
3. **Machine Tool Upgrade**: After equipment overhaul, the spindle rotation accuracy was improved. Measures such as controlling feed rates helped enhance the surface finish of the raceway, reducing the risk of over-grinding.
4. **Process Layout Adjustment**: The layout was reorganized to better accommodate the inner ring raceway, especially when there was over-running. Techniques like undercutting the jacket and adjusting the middle diameter of the cage hole were introduced to ensure better matching.
5. **Standardization of Dimensions**: By tightening the raceway size tolerance and ensuring uniformity within a small range, the overall matching rate was significantly improved, saving time and reducing the need for clearance adjustments.
These changes led to a dramatic increase in the matching rate of the "32672" cylindrical roller bearing, from 60% to over 96%. This not only reduced the repair rate but also saved labor hours, data processing time, and production costs.
The issues faced by the "32672" bearing include quenching-induced elliptical deformation, uneven material composition, and residual stress, which caused instability in the raceway scale. Additionally, aging machine tools led to poor grinding precision, resulting in excessive variation in the final dimensions.
By selecting the "32672" bearing, which has the highest annual output, the company was able to implement process optimization effectively. Similar improvements can be applied to other types of cylindrical roller bearings, such as single-row, double-row, and four-row designs, which share similar structural features like straight raceways and cage retainers.
This approach not only enhances product quality but also brings substantial economic benefits. With ongoing process refinement, the industry can continue to improve efficiency, reduce waste, and meet the growing demand for high-precision bearings.
Recommended Articles:
- Reasons for Bearing Damage and Rescue Methods
- SKF Bearing Alignment Function Calibration
- Steel Ball Mill Main Bearing Expansion Gap Adjustment
- KOYO Bearing Radial Clearance Maintenance
For more information, visit [China Bearing Network](http://www.chinabearing.net).
Previous: The Method of Improving the Precision of SKF Bearing Device
Next: Bearing Layout