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Posted on Nov 14, 201812
For those in the field of mechanical engineering, ball bearings are a type of rolling bearing, which uses balls to support the separation between the bearing races, which is essential for the entire machining process. In other words, the main purpose of ball bearings is to reduce rotational friction and help radial loads and axial loads.
For those in the field of mechanical engineering, ball bearings are a type of rolling bearing, which uses balls to support the separation between the bearing races, which is essential for the entire machining process. In other words, the main purpose of ball bearing is to reduce rotational friction and help radial loads and axial loads.
The effect of reducing friction and loads is achieved by using at least three races to accommodate the balls, and therefore the load can be transmitted through the balls. In most applications, one race is stationary, while the other one is attached to the rotating assembly.
The rotation of one of the bearing races causes the balls to rotate as well. Compared with two flat surfaces sliding, the friction coefficient of ball rolling is much lower. Bearing is useful tool that can help the machine operate normally. The original concept of the bearing can be traced back to the middle ages.
One of the earliest versions of the bearing design is a rolling bearing, which is a wooden ball bearing model that supports a rotating table. During the Renaissance, Leonardo da Vinci used ball bearings in the design of helicopters in the 16th century. Later, many Europeans were devoted to the development of bearing structures in mechanical design, with a view to smoothing the mechanical operation and reducing friction.
When it comes to modern bearings, the operation is much more complicated. During operation, due to the small contact area between the ball and the race, compared with other types of rolling bearings, ball bearings tend to have a lower load capacity. However, they can allow some deviations of the inner and outer races.
Like other mechanical devices that generate friction and movement, ball bearings must have an appropriate lubrication mechanism to work properly. Lubricants can achieve elastic hydrodynamic effects through oil or grease, and dry lubricated bearings can also be used at extreme temperatures.
If the bearing device is expected to have its nominal life under its maximum loading, a certain lubricant must be used, which must have a minimum dynamic viscosity. Only in this way can the dynamic viscosity be proportional to the diameter of the bearing.
The recommended dynamic viscosity will decrease to an appropriate value with the rotation frequency. The calculation of this value is very complicated but very critical. Professional engineers must set all the factors correctly to make the equipment operate well.
Throughout the history, the application of bearings is wide and extensive. In the field of machine tools, there are many items that cannot work without the help of bearing devices.
The spindle is one of the important components of modern machine tools. There are many types of spindle. The difference between these types is their drive mechanism and power system.
The spindles can be classified into belt driven, motorized, gear driven and direct driven according to the driven mechanism. Among them, the direct driven spindle has greater torque, which can activate the spindle faster and more accurately, while allowing a larger processing range.
Many designs and components in machinery need to cooperate with each other. Machine tools with direct driven spindles are usually designed with larger bodies to accommodate larger and longer spindle to provide higher machining strength for the work piece.
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