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Bearing correction skills
Source: China Bearing Network Time: 2018-06-16
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1. The necessity of bearing correction The bearing damage will cause the entire working system to be lost. In most traditional industrial applications, the bearing will be scrapped in advance; the cost will be added and the dregs will be incurred. The bearing correction will extend the bearing life; Another economic aspirational choice.
In terms of skill; bearing correction is to correct or replace the parts of the bearing damage; in the process of bearing correction; by grinding the raceway, replacing the roll, pin and other components; correct the bearing all the way, so its functional parts or The appearance is fully compatible with the application requirements of the new bearing.
Related to the production of new bearings; high-quality correction process can recover the bearing to the new bearing in 1/3 of the time. Compared with the acquisition of new bearings; bearing correction skills can help industrial companies save at least 40% or even higher The acquisition cost; under normal application protection; the modified bearing can fully reach the function of the new bearing.
Compared with the new bearing production; bearing correction is more suitable for environmental protection; less power input and reduced material consumption and dross. In addition; bearing correction can end the life cycle of the bearing. The discussion of the prestige seminar After the correction; the bearing cycle can be the same as the new bearing cycle. The modified bearing uses the proven bearing steel data from the beginning; thus reducing the risk of failure of the bearing data. Information and public service are necessary to match the original producer or equal norms; amendments that do not conform to the original production specifications will increase the risk of premature failure.
2. Damage to the bearing Once the bearing is damaged, it is necessary to determine whether the bearing of the damage can be corrected by a very strict inspection process. It is necessary to remove all the bearings to be repaired; then all the tests are very severe. First of all, the bearing is only detected. Need to be damaged; if there are cracks, large shedding and overheating discoloration; the bearings with these damages can not be corrected and need to be invalidated.
Bearing damage is primarily caused by chemical damage (etching, rust, corrosion spots, rust or abrasion), thermal damage (discoloration or cracking), current damage (burns, grooves or pitting), mechanical damage (tiredness, cracks, Shedding, cracking, scratching, micro shedding, staining, hardness reduction, chipping, wear, device damage, partial pain or smooth failure). It is possible to find out in advance whether the bearing work can be difficult through condition monitoring and routine inspection; Determine whether the bearing can be corrected.
3. Bearings that can be modified have many advantages over bearing corrections; but for damaged bearings; corrections are not always the best choice. Correct use of bearing correction skills depends on whether the bearing needs correction; and from the delivery and economy Think about the best of the correction plan. From the correction of things; the limitations of the correction are the maximum and minimum dimensions of the bearing and the type of product. The correction scale also constrains the scale of the correctable bearing; however, regardless of the original manufacturer; The bearings can be modified; including tapered roller bearings, spherical roller bearings, cylindrical bearings, ball bearings, stop bearings, insert roller bearings, etc.
4. Bearing correction process method When the correction piece arrives in the middle of the correction; all the bearings will be completely removed; then collapse; together with the correction engineer will record the internal information of the bearing information and practice; and end the crash and mark the only identification number; Then; will make a detailed view of all the bearing components. After the completion of the inspection, the correction plan will be determined. In addition, the target should be measured in the correction of the inner and outer diameter and bearing width; determine the type and degree of damage to determine whether the bearing can be repaired and suitable Revision plan.
Different bearing and service conditions require different bearing correction services; Timken has seven different types of bearing correction programs for all types of customers; to complete the bearing correction; but overall; bearing correction service points For the following three types. (1) Correction type I. First alignment with new bearings or bearings with less damage; including eradication detection, overall evaluation, handling of minor damage, clearance setting and modification, etc. (2) Correction type II The first priority is to match the bearing with short-term appearance damage; including eradication detection, overall evaluation, collapse, raceway and tumbling external table disposal, clearance setting and modification, etc. (3) Correction type III. All types of damaged bearings that require full correction; including eradication detection, overall evaluation, collapse, raceway fatigue removal, rollover replacement,
Cage processing or replacement, clearance ancient brakes and changes.
In short; correction type I: inspection, eradication, determination. Modification type II: protection protection or appearance fine grinding correction process. Bearings with larger damage require type III correction; that is, remanufacturing correction process. Additional corrections include more processes; such as re-grinding raceways, replacing roll and cage assemblies; and even replacing more bearing components. Correction Type III is in principle suitable for larger-scale bearings. Bearing scales are small or often Small bearings that are obsolete can also be modified if they are in batches. Excavation, inspection and surface grinding can restore these used bearings to the function of the new product; the cost is only a small part of the cost of replacing the new product.
Depending on site conditions and injury procedures; certain modifications can be made on site; however, on-site amendments are applicable to protect against protective rehabilitation;
When the correction plan is finalized and the correction is completed, the bearings will be loaded and packaged from the beginning for storage and transportation. Usually; the final inspection will be carried out to ensure the design specifications at the time of design. Different suppliers perform different levels. package.
5, the role of bearing correction The correct correction of the bearing function is the same as the new bearing. Its clearance and other precision parameters can reach the requirements of the new bearing; it is important to know and identify the damage level to select the correct correction plan. Fine grinding can eliminate certain minor damages; but it can't eliminate the real fatigue layer; it can't eliminate the fragmentation or wear caused by debris. Therefore, if only the bearing is finished for fine grinding, it is usually not suitable for severe bearing damage. If the repair process is completed by all the re-production, the fatigue layer of the bearing is completely removed; the roll body is also completely replaced; the cage is also fully packed; so that the bearing can fully reach the functional requirements of the new bearing.
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