6 methods to distinguish the false bearings

Bearing is an important part in mechanical equipment. Its main function is to support the mechanical rotator, reduce the friction coefficient during its motion, and ensure its rotation accuracy. In production and processing, once fake bearings are used, the consequences are not only machine maintenance and even downtime, but also millions of losses for the company. Today I will share 6 methods to distinguish the false bearings.

1. Check the logo and characteristic on the package is clear or not. 
2. Check certificate of quality is standard or not. 
3. Check whether the steel print on the bearing is clear or not.
4. Check the overall quality of bearings.
5. Check the metallic luster of bearings.
6. Rotate the bearings to check whether there is noise or not. 

Features of Deep groove ball bearings

Features Of Deep Groove Ball Bearings:

• The cheapest and most commonly used bearing type; produced in many designs and sizes
• The bearings are characterised by simple designs and cannot be disassembled
• The bearings can handle operational conditions and their maintenance is simple
• The bearings show relatively good load rating both in radial and axial directions
• The bearings are suitable for high and very high speeds
• The bearings require good alignment of the journal and bearing body; the permissible tilting angle is approx. 10'
• The bearings are delivered with shields or seals

Selection of Angular contact ball bearing

The selection of angular contact ball bearing should consider working condition and limited space. Working conditions mainly include use environment, precision, speed, force direction and size, and so on. 

High speed, small load generally use non-metal cage; low speed, heavy load use metal cage; High temperature environment use metal cage; medium temperature environment generally use engineering plastic cage; general nylon cage temperature can not exceed 120 degrees.

For ultra-high speed, wear resistance, low temperature rise, long life and high availability environment, hybrid ceramic ball bearings can be used; balls use silicon nitride ceramics. 

If the accuracy of the shaft is high, for example, P4 or P2 bearing is generally used for machine tool spindle; P5 or P4 grade is generally chosen for medium precision, and P0 or P6 grade can be selected for general precision. 

If high rotational speed is required, light series bearings with contact angle of 15 ° should be selected first；2 series or 3 series angular contact ball bearing with 40 °contact angle can be selected if bearing needs to bear big axial load; the angular contact ball bearing with contact angle of 25 °can be selected if the rotational speed and axial load should be taken into account at the same time.

The requirements of oil and gas lubrication for motorized spindle

1. lubrication oil cleanliness grade: 13 / 10 (ISO4406); 

2. Air cleanliness: air filtration accuracy 0.01 micron; 

3. Air dryness: Dew point is +2 ℃; 

4. Inlet gauge pressure in front of bearing nozzle: 2-3 bar; 

5. Oil and gas delivery pipe: inner diameter 2 to 2.5 mm; 

6. The length of oil and gas pipeline: the length should be 1 ~ 4 meters; the helical pipe is favorable for oil storage near the terminal lubricating point. 

When the bearing runs again after stop, the oil and gas can be put in place quickly and the response time will be shortened. Then the selection of oil and gas lubrication products must first meet the above requirements. In addition, it is important to make use of the performance of oil and gas lubricating products in order to transport oil and gas to the motorized spindle and to realize reliable and stable operation. 

Selection of Oil and Gas Lubricating products for High Speed motorized spindle

High speed motorized spindle is mainly used in high speed engraving and milling machine and grinding machine. The reliable lubrication for motorized spindle with high speed operation is really important. At present, lubrication is divided into: grease, oil mist, oil and gas.

Oil lubrication: The speed of oil lubricating motorized spindle is not high and bearings have been packed when they are selected. For the motorized spindle with high load running, this kind of lubricating method has advantages that the cost of motorized spindle is low.

Oil mist lubrication: In fact, when the motorized spindle has only one lubricating inlet, this type of lubrication is not conducive to the reliable and effective supply of lubricating, and it will cause the excessive consumption of oil and the risk of pollution to the operating environment.

Oil-gas lubrication: because of the obvious advantages of oil-gas lubrication, the current motorized spindle manufacturers generally use it.

How to ensure the stable and reliable operation of the motorized spindle?

1. Accurate quantitative oil supply. Adjust the quantity of lubricating oil to the bearing end freely with the range of 5-40mm. 

2. Digital display time setting: can realize the arbitrary setting of oil supply cycle time. 

3. Pressure monitoring: able to monitor oil and gas pressure or gas supply pressure. 

4. Monitoring of oil supply status: because of the small amount of oil supply per unit time of motorized spindle and the interval of oil supply is 3 min-7 mins or more, so the stability test of oil feeding at each lubricating point is an important index. 

5. Bearing chamber pressure: that is, oil and gas pressure should be adjustable to set. 

6. Display and fault feedback: product running state and fault should be displayed with remote feedback functions, such as: high or low gas source pressure fault, low liquid level, oil fault and so on. 

The above points are the guarantee to ensure the stable and reliable operation of the motorized spindle. Therefore, the selection of oil-gas lubrication products should be careful. 

How to distinguish ZYS low speed bearing and high speed bearing?

High and low speed bearings are generally defined with linear speed rather than rotational speed. The speed of high speed bearings must reach the speed requirement of over 60 meters per second, so small bearings may be tens of thousands of turns, but they are not high speed bearings; very large bearings may only have hundreds of turns per minute, but they are high speed bearings, because their linear speed is high. In sliding bearings, hydrostatic bearings, hydrodynamic bearings and pneumatic dynamic bearings are suitable for high speed rotation. Low speed generally use rolling bearings, and high-speed generally use general sliding bearings.

If we must distinguish the high and low speed bearings from the appearance, we can see the following two points: 

1. The high speed bearing is more accurate than the low speed bearing, and its surface roughness is small. The intuitive difference is that the surface of the high speed bearing is more smooth than the low speed bearing, and the clearance between the outer ring and the inner ring of high speed bearing is smaller.
2.  Compared with the low speed bearing, the raceway precision of high speed bearing is higher than that of low speed bearing. 

Advantages of ZYS electrical spindles

Alternative import

All key components of the product are independently researched and developed, and the performance has reached the same level of foreign products, and the quality is reliable.

Professional customization

According to the actual work situation of the customer, the optimal design obtained from various factors can be integrated to meet the individual needs.

Flexible configuration

The machining center spindle can be equipped with temperature sensor (temperature measurement and temperature switch), vibration sensor, proximity switch, encoder, rotary joint, etc. according to customer's requirements. At the same time, the spindle electrical components adopt well-known brands and have good compatibility.

Quality service

Pre-sales technical exchange is sufficient, after-sales service response is fast, product maintenance cycle is short.