Rolling element of the roll-in elemental pads in race . Big races that go into the hole are called outer races , and the small race ridden by the axis is called inner races .
Video Race (bearing)
Design
In the case of ball bearings, bearings have inner and outer races and a set of balls. Each race is a ring with a groove where the ball is resting. The groove is usually formed so the ball is slightly loose in the groove. So, in principle, the ball contacts every race at one point. However, the load at a very small point will cause very high contact pressure. In practice, the ball deforms a bit where it contacts every race, just like a flat tire where it touches the road. The race is also a bit dented where every ball presses it. Thus, contact between the ball and the race has a finite size and has limited pressure. Note also that flawed balls and races do not roll entirely smoothly because different parts of the ball move at different speeds as they roll. Thus, there are opposite forces and sliding motion at each ball/race contact. Overall, this causes bearing resistance. The "V" race track distributes the load evenly over the ball as they travel on four points of contact, creating a straight-line coiling effect and reducing the amount of friction created by the full contact spherical design.
In some applications, two races can be arranged on plates parallel to the spherical plane, not on the inner and outer sleeves. In this case, the inner and outer sides of the grooves that make up the race must have different angles with respect to this field, with a steeper angle to the deeper grooves and the shallower angles of the outer groove, so that each sphere can rotate properly. without slipping.
Maps Race (bearing)
Producing
No center milling
The outer diameter (OD) of the race is often without center using throughfeed process. The centerless grinding can achieve a very high degree of accuracy, especially when it is done gradually. These stages are: rough, semi-finished and finished. Each grinding stage is designed to remove enough stock of material from the casing so that the next stage does not encounter problems such as burning or surfaces, the final stage reaches the final dimension. Each grinding wheel at all the above mentioned stages has a varying abrasive quality level (finished to the best grade) to achieve the proper stock removal for the next stage and the required final surface finish.
Feed
The casing pad is introduced into the grinding action by transfer from the delivery system to a pair of infeed rollers, the infeed roll is tapered to a certain angle so the casing is pushed forward until the regulating wheels and grinding wheels catch it and slow them down to their grinding speed which can be changed by the speed control of the wheels regulator. The casing keeps spinning and is inserted into the milling area to prevent any separation that may cause the finished problem/size or even "bump" which could potentially crack or damage the casing and will damage the grinding wheels and regulator.
Work rest blade
While grinding, the case bearing goes through the grinding stage in a long tube of casing that is bombarded with cutting fluid. The 'tube' lies in a hardened steel blade with a very sloping ground surface held in the horizontal plane between the grinding wheel and the adjusting wheel, commonly called the Work Rest Blade, the tube causing wear and tear on the work surface of the blade so it must be reset periodically. The height of the work break blade perfectly aligns the bearing casing with the horizontal centerline of the grinding wheel that creates a perfect soil layer, the height of the working break blade can be changed using the packing rods placed under the blade, altitude adjustment should be made depending on the diameter of the milled casing.
Inspection
Each casing exits the milling zone to a high-speed conveyor that delivers them to any manufacturer's storage and/or inspection arrangements, checks are also performed by the central line operator, by checking the final display, diameter, square and roundness by using the call test indicator in various configurations, size allowances are permitted but are very strictly dependent on customer requirements and may vary plus or minus in micrometers of the finished diameter, Size can be adjusted at all stages of milling via compensation buttons that can be pushed to remove additional material in various micrometer units, can move with the same compensation to make the casing larger if necessary if the size of the casing moves from the target operator, and like the grinding wheel used. Since the centerless grinding line is usually three milling machines the operator must be in full control and should prevent plugging in transfers, grind out and packing areas, also the size and quality should always be checked, so the operator is always alert when operating the channel and checking for quality problems and problems.
Security
Safety features include an emergency stop button that immediately removes the grinding wheel from the earth ring on its revolutionary axis. Because of the momentum of the wheel, it can not be stopped but the power is cut and the wheel slows down naturally, it can not be reactivated until the emergency stop reset. After the emergency stop is activated, the size of the workpiece must be reshaped before the line can be re-enabled into production mode.
Completed
The outer and inner cushioning casing is then sent for assembling raceway grinding, superfinishing and final.
References
See also
- Brinelling
- Wire racing pad
Source of the article : Wikipedia
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