How to extend the life of the rotor bearing?

Rotor bearings are one of the frequently replaced parts of the impact crusher. How to extend the life of the rotor bearing? The following Asian fluid network small series is explained in the following three aspects.

First of all, to choose the appropriate model and specifications, the common column-center spherical rolling bearing has strong pressure resistance, high wear resistance and good self-aligning. It is more suitable as a rotor bearing for impact crusher, and its service life is long and its average life is 10,000 hours or so.

Secondly, it is necessary to adjust the force of the impact crusher rotor bearing. The force of the rolling bearing depends on the impact force of the broken rock of the rotor and the supporting force of the bearing seat. Moderate adjustment of the flexibility of the bearing seat will reduce the rolling pressure of the bearing to a certain extent, and the user can pass the bearing seat. A rubber sheet is added in the middle of the bracket to increase the flexibility of the bearing seat, thereby damping the bearing's rotational pressure, reducing bearing wear and prolonging the service life of the rotor bearing.

Finally, it is necessary to ensure that the rotor balance accuracy is within the appropriate range. The quality of the counter crusher rotor and the plate hammer is very large. If the plate hammer is eccentric when the rotor rotates due to quality error or misalignment, the bearing rotational pressure will be increased, and the crusher will generate abnormal vibration and damage other zeros. component. Therefore, when installing the hammer, the staff must strictly follow the instructions on the drawings to reduce the error as much as possible, so that the rotational pressure of the rotor bearing becomes smaller and the service life is prolonged.
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Ferrule forming method for rolling bearing manufacturing

At present, in the ferrule processing, the molding methods mainly include the following types: forging type, turning forming, cold boring expansion molding, and cold (warming) extrusion molding. Among the above molding methods, forging type processing is the most widely used, accounting for about 80% of the total production volume. For some small general-purpose products, rod (tube) material can be directly turned and formed. Since the 1980s, some small and medium-sized enterprises in China have adopted cold rolling and cold (warm) extrusion molding processes in the production of small and medium ferrules.

First, cold forming

The cold rolling process is an advanced process method that can improve the material utilization rate, improve the compactness of the metal structure, and maintain the linearity of the metal flow. It is a chipless processing method. In theory, cold-formed products can be directly heat treated and ground without turning. At present, the cold rolling process is mainly applied to medium and small deep groove ball bearings. The main process is:

Forged blank (ring) - turning (except channel) -  expansion (ditch and chamfer) full diameter - soft grinding end faces

When using the cold boring process and the forging process, the accuracy of the product is affected by the accuracy of the machine, and the accuracy of the forming die.

Second, forging type

Through forging processing can eliminate metal internal defects, improve metal structure, make metal flow line distribution reasonable, and metal tightness. The forging-type processing technology is widely used in bearing forming processing, and can process from small products with an inner diameter of ~20mm to extra large products with an outer diameter of 5000mm. Common forging methods are: hot forging, cold forging, warm forging, and hot forging in China.

Hot forging processing is divided into: free forging processing technology, press forging process, flat forging machine forging process and high speed upsetting machine forging process due to different molding processing equipment.

Third, turning molding

In the bearing industry, the traditional turning technology uses a special lathe to complete the forming process using a centralized process. However, due to the difficulty in adjusting the equipment used in this method, the low precision of the machine tool and the low material utilization rate, the process is being eliminated.

With the development of science and technology, CNC turning machine tools have developed rapidly and become more and more perfect. At present, some products with complex shapes and high precision requirements are increasingly using CNC turning technology.
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Bearing model size

Bearing model sizes vary depending on the type of work.

A, deep groove ball bearings 6000, 6200, 6300, 6400;

B. Deep groove ball bearings with stop grooves on the periphery 6000-N, 6200-N, 6300-N, 6400-N type;

C. Deep groove ball bearings with dust cover on one side 6000-Z, 6200-Z, 6300-Z, 6400-Z, 6000-2Z, 6200-2Z, 6300-2Z, 6400- with dust cover on both sides 2Z type;

D, deep groove ball bearing with dust ring (contact type) 6000-RS, 6200-RS, 6300-RS, 6400-RS type, double-sided contact seal 6000-2RS, 6200-2RS, 6300-2RS, 6400- 2RS type;

E, deep groove ball bearing with sealing ring (non-contact type) 6000-RZ, 6200-RZ, 6300-RZ,, 6400-RZ type, two-sided non-contact deep groove ball bearing 6000-2RS, 6200-2RS , 6300-2RS,, 6400-2RZ type;

 Deep groove ball bearings can be roughly divided into the following types of structures;

Single row deep groove ball bearing: single row deep groove ball bearing with dust cover, single row deep groove ball bearing with dust cover and sealing ring, single row deep groove ball bearing with single groove and deep groove ball on the outer ring with stop groove and stop ring Bearings: These bearings are generally used in parts that are installed, sealed, and fitted without special requirements.

Single row deep groove ball bearings with dust cap: These bearings can be used in difficult lubrication and difficult to check lubrication and special conditions. There is a gap between the dust cover and the inner ring. Bearings with dust caps on both sides are filled with the appropriate lubricant at the time of manufacture, so no cleaning or lubrication is required during installation.
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One-way bearing working principle

1. Slope and roller design one-way bearing

The ramp and roller one-way clutch consists essentially of an outer ring of cylindrical inner diameter, an inner ring with a ramp, and a set of rollers that are respectively spring-loaded and in close contact with the inner and outer rings. As long as the rotation of one of the raceways in its direction of motion has an effect on the other, this arrangement essentially ensures the instantaneousness of the speed of overrun and ensures immediate drive capability.

A ramp-type one-way clutch with only the inner ring rotating is suitable for relatively low speeds. If the required speed is higher than the recommended speed, a wedge type one-way clutch is recommended. When used as an indexing one-way clutch, the outer ring is often seen as a wobble element and the inner ring is often seen as a slave element. Otherwise, the inertia of the rollers and springs will cause errors, especially at high frequency divisions. The use of diluted lubricants and powerful springs provides high-speed indexing accuracy and high quality.

2, wedge type design one-way bearing

The wedge type one-way overrunning clutch is generally composed of an inner ring, an outer ring, a wedge group, a wedge cage, a strong spring and a bearing. The wedge transfers forces from one raceway to the other by wedging between the inner and outer races. The wedge has two diagonal diameters, one from the corner of the wedge to the other diagonal, one of which is larger than the other. The wedge action forces the wedge to have a larger vertical position on a relatively large cross section when the inner and outer rings are rotated relative to each other.

3, self-locking angle one-way bearing

The wedge action mainly depends on the wedge and self-locking angle of the wedge between the inner and outer rings. The basic concept of a wedge one-way clutch requires that the friction coefficient of the wedge be related to the sudden generation of torque in the inner ring in the drive direction. This friction value must be greater than the tangent of the self-locking angle. If the condition is not met, the wedge will not occur. The self-locking angle is determined by the structure of the wedge, and the points on the inner and outer rings are respectively connected by wedges.

The design of the wedge has a very low initial self-locking angle to ensure absolute bonding at the beginning. As the torque increases, a radial force will be created on the wedge that deflects the wedge race, causing the wedge to roll to a new position. Wedges are often designed to have a self-locking angle that can be gradually increased, as it goes from the overrun position to the maximum load bearing position. A relatively large self-locking angle can reduce the radial force generated by the wedge, so that a larger torque is allowed to be transmitted as long as the elongation and Brinell hardness limits are required.

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