In the use of cross bearing, we first check the appearance of imported bearings, to determine whether it conforms to the standard we require. Here to share with everyone one that we should check that those parts. Bearings should be checked for astigmatism lamp, the appearance of the bearings, cracks and other parts of careful observation.
1, various mechanical injuries, such as rubs, scratches, bruised, bumps, etc., can cause adverse bearing installation, causing partial load and stress concentration, resulting in a decline in rotation accuracy and service life.
2, rust, black and pits, the latter two are easy to store moisture and dirt defects, the most likely to develop into rust. The corrosion is the cause poor installation, the sources of early wear and fatigue, severe corrosion cause bearing scrap.
3, various cracks, such as raw materials, crack, crack forging, heat treatment and grinding cracks, cracks, these cracks in the future during the operation of the bearing, will be a source of stress concentration and rapid expansion, resulting in rupture of the bearing of the bearing life and safety at work of great impact. In fact, for the important purpose bearings, bearing factory has 100% of its constituent parts or ray magnetic particle inspection.
4, peeling and folding, these two defective part and base metal binding is not strong, and its surroundings often exist to varying degrees, or depleted carbon decarburization phenomenon, materials easy caving, debossing or wear of the bearing life and accuracy are negative.
5, riveted or welded cage quality rivet head is mainly observed deviation, skew, relaxation, lack of meat or 'eyelid', the correct position of the welding, solder joint is too large or too small, whether strong or welding welding caused by excessive stuck rolling phenomenon more than a few that we focus on checking SKF bearings in part inspection, in addition to other than the part of the inspection, in addition to poor quality such as typing, such as illegible, damaged, shall be considered as defective, In severe cases, can not be accepted.
2013年8月27日星期二
2013年8月23日星期五
Crossed roller bearings isolation block design defects and improvement
Crossed roller bearings known as cross roller bearings, cylindrical roller generally use roller or tapered roller in a single raceway cross mutually arranged between the roller and the roller cage or through isolation block interval, with high rotational accuracy, the larger the capacity, the smaller dimensions and a higher rotational speed and rigidity, with a very wide range of uses.
cross roller bearing design flaws and improve it.
1 inside the bearing arrangement of the roller, two adjacent rollers arranged in cross, all arranged in the same direction roller intersects the centerline axis of the rotary bearing, two rollers arranged in a direction opposite to the axis of intersection of the center line of the bearing slewing relative to the plane of the center roller symmetrical.
2 Isolation of existing designs of the defect blocks according to the current design, two cylindrical grooves spacers axis the axis perpendicular to the radial plane spacers are parallel, and in that the projection plane perpendicular to each other. Manufactured using current design method has the advantage of an isolation block with good versatility. As long as the selection of different roller bearing the same specifications, generally can use the same kind of isolation blocks. Spacers is cylindrical, its axis center line tangent to the circle of rollers. However, two adjacent roller axes A and B blocks are not isolated from the axis perpendicular to the radial plane are parallel.
Prime line roller work surface and isolation block cylindrical groove surface pixel lines are not parallel, but inclined at an angle, causing the contact state is not good, affect the bearing rotation flexibility and precision rotation speed is higher, the effect is also more obvious. Therefore, it is necessary to improve the design of the separators, the separators of the roller axis of the cylindrical grooves parallel to the axis, thereby improving the isolation block the cylindrical roller groove surface. The higher the speed, the more obvious the effect.
cross roller bearing design flaws and improve it.
1 inside the bearing arrangement of the roller, two adjacent rollers arranged in cross, all arranged in the same direction roller intersects the centerline axis of the rotary bearing, two rollers arranged in a direction opposite to the axis of intersection of the center line of the bearing slewing relative to the plane of the center roller symmetrical.
2 Isolation of existing designs of the defect blocks according to the current design, two cylindrical grooves spacers axis the axis perpendicular to the radial plane spacers are parallel, and in that the projection plane perpendicular to each other. Manufactured using current design method has the advantage of an isolation block with good versatility. As long as the selection of different roller bearing the same specifications, generally can use the same kind of isolation blocks. Spacers is cylindrical, its axis center line tangent to the circle of rollers. However, two adjacent roller axes A and B blocks are not isolated from the axis perpendicular to the radial plane are parallel.
Prime line roller work surface and isolation block cylindrical groove surface pixel lines are not parallel, but inclined at an angle, causing the contact state is not good, affect the bearing rotation flexibility and precision rotation speed is higher, the effect is also more obvious. Therefore, it is necessary to improve the design of the separators, the separators of the roller axis of the cylindrical grooves parallel to the axis, thereby improving the isolation block the cylindrical roller groove surface. The higher the speed, the more obvious the effect.
Cross roller bearing raceway gears and repair
Commonly used in the manufacture of gears with steel quenched and tempered steel, hardened steel, case hardening steel and nitriding steel. Slightly lower than the strength of forged steel, commonly used in sizes larger gear; poor mechanical properties of gray cast iron can be used for light load of open gear drive; ductile iron can partially replace the steel gears; multi-purpose plastic gear at light load and low noise requirements of the place, with its paired gear generally good thermal conductivity of steel gears. Once the gear wear, how to fix next described in detail.
Crossed roller bearing Gear Repair:
The best way to go is to measure the wear of the ring gear worst damage teeth, the gear module to ensure the same case, by calculating, re-hobbing, negative change of the gear position, the same, the gear unit associated with it The output pinion positive displacement, in order to ensure that the two gears meshing center distance constant, a pair of gears to high displacement. Followed by the corrupted repair worn teeth first with liquid plastic or surfacing and leave allowance, then hobbing to its original size. To ensure that the original transmission parts and spare parts (such as the output pinions, etc.) can be used again, the need to ensure the same gear center distance of tooth repair, using the method of surfacing reprocessing.
Raceway Repair:
Four raceway formed by the diameter of the square cross-section, the diagonal perpendicular to the ground, that is, each raceway by both the overall cross-sectional diameter of the center line of a 45 ° angle, the raceway surface damage is more serious, oval-shaped, with a flange ring and the annular surface dents to the front indicated baselines grinding raceway surface (due to high surface hardness), by measuring the roundness deviation of 3mm, after grinding, measuring hardness, were HRC30 ~ 40, in order to ensure a 45 ° angle, special production model (see figure II) is used to measure angles. Raceway surface-hardening, quenching hardness HRC55 ~ 60. Then again grinding.
Crossed roller bearing Gear Repair:
The best way to go is to measure the wear of the ring gear worst damage teeth, the gear module to ensure the same case, by calculating, re-hobbing, negative change of the gear position, the same, the gear unit associated with it The output pinion positive displacement, in order to ensure that the two gears meshing center distance constant, a pair of gears to high displacement. Followed by the corrupted repair worn teeth first with liquid plastic or surfacing and leave allowance, then hobbing to its original size. To ensure that the original transmission parts and spare parts (such as the output pinions, etc.) can be used again, the need to ensure the same gear center distance of tooth repair, using the method of surfacing reprocessing.
Raceway Repair:
Four raceway formed by the diameter of the square cross-section, the diagonal perpendicular to the ground, that is, each raceway by both the overall cross-sectional diameter of the center line of a 45 ° angle, the raceway surface damage is more serious, oval-shaped, with a flange ring and the annular surface dents to the front indicated baselines grinding raceway surface (due to high surface hardness), by measuring the roundness deviation of 3mm, after grinding, measuring hardness, were HRC30 ~ 40, in order to ensure a 45 ° angle, special production model (see figure II) is used to measure angles. Raceway surface-hardening, quenching hardness HRC55 ~ 60. Then again grinding.
2013年7月29日星期一
Cross roller bearing life affecting reasons
Using factor mainly refers to the installation and adjustment, use and maintenance, repair and other maintenance meets the technical requirements. According cross roller bearing installation, use, maintenance, maintenance of the technical requirements for operation of the bearings to bear the load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, abnormal immediately find reasons to adjust bring it back to normal. Installation conditions are the primary factors that one of the factors bearing is often caused by improper installation package bearing force between the various parts of the state change, bearing in abnormal state of operation and early end of life
Internal factors mainly refers to the structural design, quality manufacturing processes and materials of the three factors that determine the quality of the bearing.
cross roller bearing materials metallurgical quality affect cross roller bearings early failure of the main factors. As metallurgical techniques (such as bearing steel vacuum degassing, etc.) progress, improve the quality of raw materials. Raw material quality factors in bearing failure analysis in the proportion has decreased significantly, but it is still bearing failure is one of the main factors. Appropriateness of the selection is still bearing failure analysis must be considered.
Crossed roller bearings are generally manufactured through forging, heat treatment, turning, grinding and assembly of multi-channel processing. The reasonableness of the processing technology, advanced, will also affect the stability of the bearing life. Which affect the quality of the finished bearing heat treatment and grinding processes, often with bearing failure have a more direct relationship. In recent years, the working surface of the bearing metamorphic layer studies show that the quality of the grinding process and is closely related to the bearing surface.
Cross roller bearing life analysis of the main task is based on a lot of background material, analysis of data and failure modes, find the cause of bearing failure of the main factors in order to have targeted improvements to extend bearing service period, to avoid bearing sudden occurrence of early failure.
Internal factors mainly refers to the structural design, quality manufacturing processes and materials of the three factors that determine the quality of the bearing.
cross roller bearing materials metallurgical quality affect cross roller bearings early failure of the main factors. As metallurgical techniques (such as bearing steel vacuum degassing, etc.) progress, improve the quality of raw materials. Raw material quality factors in bearing failure analysis in the proportion has decreased significantly, but it is still bearing failure is one of the main factors. Appropriateness of the selection is still bearing failure analysis must be considered.
Crossed roller bearings are generally manufactured through forging, heat treatment, turning, grinding and assembly of multi-channel processing. The reasonableness of the processing technology, advanced, will also affect the stability of the bearing life. Which affect the quality of the finished bearing heat treatment and grinding processes, often with bearing failure have a more direct relationship. In recent years, the working surface of the bearing metamorphic layer studies show that the quality of the grinding process and is closely related to the bearing surface.
Cross roller bearing life analysis of the main task is based on a lot of background material, analysis of data and failure modes, find the cause of bearing failure of the main factors in order to have targeted improvements to extend bearing service period, to avoid bearing sudden occurrence of early failure.
Thin section crossed roller bearings rust causes and preventive measures
Thin section crossed roller bearings rust causes and preventive measures
Thin section crossed roller bearing corrosion, there are two main reasons: First, the bearing itself metal corrosion, corrosion of two human factors.
Bearing itself accounted for the vast proportion of metal corrosion, because the work needs, many times this is unavoidable. Human contact bearing, the hand can cause bearing corrosion sweat, sweat contact bearings mainly in its surface sweat membrane interactions lead to corrosion electrochemical reaction will occur, but this is to be avoided, such as to bring professional pick Part of gloves and other tools.
Thin section crossed roller bearings cause metal corrosion which is mainly reflected in the following points:
1, the surface finish;
2, the metal materials, chemical structure and composition;
3, the metal surface of the component and the PH value of the solution;
4, the environmental media;
5, the ambient humidity and temperature.
Thin section cross roller bearing prevent corrosion measures are mainly: to maintain the bearing surfaces are clean, and the cleaning must use the appropriate method. General chemical treatment cleaning, mechanical cleaning and a solvent cleaning methods. Clean the surface after drying compressed air available, you can also use 120 ~ 170 ℃ the drier, and then wipe dry with a clean gauze. Finally, the bearings coated with anti-rust oil, as follows:
Using the immersion method, the film thickness can be controlled by anti-rust oil temperature or viscosity to achieve. Some small items using immersion in rust oils, allowed surface adhesion layer of anti-rust oil; Dena Man Mr. Gao
Using a spray method, the object can not be taken to some large rust oiled soaking method for thin-layer anti-rust oil or solvent dilution type rust preventive oil, but pay attention to labor and fire protection measures;
Use brushing, brushing not only to avoid the accumulation does not produce, but also to prevent leakage caused by paint. For non-immersion or spray with some of the special shape of the products or outdoor construction equipment.
Thin section crossed roller bearing corrosion, there are two main reasons: First, the bearing itself metal corrosion, corrosion of two human factors.
Bearing itself accounted for the vast proportion of metal corrosion, because the work needs, many times this is unavoidable. Human contact bearing, the hand can cause bearing corrosion sweat, sweat contact bearings mainly in its surface sweat membrane interactions lead to corrosion electrochemical reaction will occur, but this is to be avoided, such as to bring professional pick Part of gloves and other tools.
Thin section crossed roller bearings cause metal corrosion which is mainly reflected in the following points:
1, the surface finish;
2, the metal materials, chemical structure and composition;
3, the metal surface of the component and the PH value of the solution;
4, the environmental media;
5, the ambient humidity and temperature.
Thin section cross roller bearing prevent corrosion measures are mainly: to maintain the bearing surfaces are clean, and the cleaning must use the appropriate method. General chemical treatment cleaning, mechanical cleaning and a solvent cleaning methods. Clean the surface after drying compressed air available, you can also use 120 ~ 170 ℃ the drier, and then wipe dry with a clean gauze. Finally, the bearings coated with anti-rust oil, as follows:
Using the immersion method, the film thickness can be controlled by anti-rust oil temperature or viscosity to achieve. Some small items using immersion in rust oils, allowed surface adhesion layer of anti-rust oil; Dena Man Mr. Gao
Using a spray method, the object can not be taken to some large rust oiled soaking method for thin-layer anti-rust oil or solvent dilution type rust preventive oil, but pay attention to labor and fire protection measures;
Use brushing, brushing not only to avoid the accumulation does not produce, but also to prevent leakage caused by paint. For non-immersion or spray with some of the special shape of the products or outdoor construction equipment.
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