**Short Cylindrical Roller Bearing Matching Qualification Rate Improvement Method** Home > Bearing Knowledge > Short Cylindrical Roller Bearing Matching Qualification Rate Improvement Method /*728*90 created on 2018/5/16*/ var cpro_id = "u3440131";

Short Cylindrical Roller Bearing Matching Qualification Rate Improvement Method

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Short cylindrical roller bearings are known for their high precision, accurate fit, and ability to handle primary radial loads. They are widely used in large precision machine tools and finishing equipment. Recently, these bearings have become a core product of Luo Axis Group's large-scale bearing business unit, contributing significantly to the unit’s output value—accounting for about one-third of total production. However, the business unit has been using outdated production methods, resulting in a low matching qualification rate (only 60%). This inefficiency leads to excessive data processing, long working hours, and ultimately, reduced economic benefits. To address this, a comprehensive process optimization plan was implemented, focusing on improving the matching rate and overall efficiency. The optimization process began by selecting the “32672” type short cylindrical roller bearing, which has the highest annual output. The main challenges included issues with heat treatment deformation, uneven residual stress, and poor surface finish due to aging machinery. These problems led to over-grinding of raceways, affecting installation clearance and causing instability in the bearing’s performance. To resolve these issues, several improvements were introduced: 1. **Heat Treatment Optimization**: By collaborating closely with the heat treatment plant, deformation control was improved. Adjustments were made to the raceway retention based on the plant’s shortening data, ensuring sufficient grinding allowance after quenching. 2. **Additional Tempering Process**: A tempering step was added to reduce internal stresses and stabilize the raceway scale, preventing irregularities after final grinding. 3. **Machine Tool Upgrade**: The aging machine tools were overhauled to improve spindle rotation accuracy and control feed rates, leading to better surface finish and reduced over-grinding. 4. **Process Layout Adjustment**: The layout was modified to accommodate the inner casing raceway, which was most affected by deformation. A method was developed to undercut the outer jacket and adjust the middle diameter of the cage hole, ensuring better matching. 5. **Standardized Raceway Finishing**: A public service belt was introduced to standardize the raceway dimensions across batches, minimizing variation and improving matching consistency. As a result of these improvements, the matching qualification rate of the “32672” bearing increased from 60% to over 96%. This not only reduced the repair rate but also saved significant time, labor, and material costs, greatly enhancing production efficiency and profitability. **Related Bearing Knowledge** - How to Maximize the Life of the Bearing? - How to Deal with the Increase in Bearing Temperature During Turbine Operation - Analysis of SKF Bearing Faults in Transmission Systems - The Accuracy of Bearings Is Not Just About Smoothness This article is linked to http:// Please indicate the bearing network http:// Previous: The Higher the Importance of INA Bearings, the More Stable It Is Next: Analysis: Use of Bearings in Coal Mine Operations

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