Deep Groove Ball Bearing GuideDeep groove ball bearings refer to deep groove ball bearing units, which are designed as part of deep groove bearing part. Ball bearings are commonly used parts with or without deep grooves, especially for transmission purposes in machine tools. Grooved ball bearing units are common in the industrial usages, because the deep groove bearing is a positive feature that can help many works for operation.
For engineers in the field of mechanical engineering, a ball bearing is a type of rolling-element bearing, which uses balls to support the separation between the bearing races, which is essential to the entire processing process. In other words, the main purpose of ball bearings is to reduce rotational friction and help radial and axial loads. Both the friction reduction and loads are achieved by utilizing at least three races to contain the balls, and are thus able to transmit the loads through the ball units.
In most applications, one race of the bearing is fixed, while the other is attached to the rotating assembly. This design allows one of the bearing races to rotate and causes the balls to rotate. Compared with the sliding of two flat surfaces, the friction coefficient of ball rolling is much lower.
Bearings are a useful tool to help the machine work smoothly. The initial concept of bearing can be traced back to the Middle Ages. One of the earliest versions of bearing design is a rolling element bearing, which is a wooden ball bearing model that supports a rotating table. During the Renaissance, an artist used drawings of ball bearings in his design for helicopter in 16th century. Later, many European engineers devoted themselves to the development of bearing structures in mechanical design, hoping to stabilize the mechanical operation and reduce damage caused by friction by installing bearings.
Loading of Ball Bearing
Modern bearings have many functions, so they are versatile and the operation is much more complicated. During operation, due to the smaller contact area between balls and races, the load capacity of the ball bearing is often lower than that of other types of rolling-element bearings. However, they can tolerate certain misalignment of the inner and outer races.
Like any other mechanical devices that involve friction and movements, ball bearings must have an appropriate lubrication mechanism to work properly. Generally, an elasto-hydrodynamic effect achieved by an oil or grease-based lubricant is used. In extreme temperatures, dry lubricated bearings can be used.
If the bearing device is expected to have its nominal life under its maximum loading, the bearing must be lubricated with lubricant. The lubricant needs to have the recommended minimum dynamic viscosity, and the correct dynamic viscosity can be proportional to the diameter of the bearing. At this point, to be precise, the recommended dynamic viscosity will decrease with rotating frequency to an appropriate value. The calculation is complex but critical, and engineers must set all factors correctly to make the equipment operate normally. Throughout history, the application range of bearings is wide. In the field of machine tools, there are many mechanisms that cannot work without the help of bearing devices.
Application onto Spindle
As described, the machine tool spindle is one of the important components of modern machine tools. There are many types of spindle designs, and different types depend on its driving mechanism and power system. The spindle classification includes belt driven, motorized, gear driven, direct driven, motor built in, etc. Compared with other drive mechanisms, the design of the direct driven spindle can provide greater torque power, faster and more accurate activation, while allowing a larger processing area.
The speed of the spindle is a key parameter that determines the performance of the machining center. In high speed models, the RPM (revolutions per minute) standard is different, and there is no such a common range. Although manufacturers in Europe, Japan and Taiwan have a consensus on the RPM standard, regional differences are still large. In the metalworking field, a turn and mill machine is also known as a CNC turning center. This is a machine tool with both turning and milling functions, and can rotate the workpiece on the rotating axis to perform various machining operations.
Traditionally, a machine tool can contain several spindles, such as the headstock and tailstock spindles of a bench lathe machine. The primary spindle is usually is the biggest one. Therefore, if the spindle is referred to without further qualification, it usually refers to the primary spindle. Today's industry tends to integrate many available components together. Machine tools equipping DD spindles are usually designed to have a larger body so that they can accommodate larger and longer spindles, thereby providing greater machining strength for the workpiece.
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