Turntable Bearings-Wenzhou Bearing wholesale

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Bearing Knowledge

Turntable Bearings

点击数：6699 日期：2014/4/4

Turntable Bearings CNC machine tools commonly used in rotary table partakers of the table and CNC rotary table . CNC machine tools in the processing of certain parts , apart from the straight line need X, Y, Z three axes feed motion , but sometimes also need to have X, Y, Z three axes around in a circular motion , we were called the A, B, C axis. NC rotary table can be used to achieve the circumference feed movement . NC rotary table ( referred to as NC rotary table ) in addition to the circumference of the feed movement can be achieved , but also can be completed indexing movement . The indexing table indexing function just changing the workpiece surface , and with the use of automatic tool changer , the installation can be completed to achieve a workpiece several faces a variety of processes , thus , greatly improving the work efficiency. Not much difference in the shape and NC rotary indexing table , but it has a series of structural features. Since the NC rotary table enables feed movement , so it is structurally and CNC machine feed drive mechanism have much in common . The difference is that the drive mechanism to achieve is linear feed movement, and NC rotary table to achieve is the circumference of the feed movement . Rotary table is widely used in a variety of CNC milling machines, boring machines , a variety of vertical lathe , vertical milling machine . In addition to requiring rotary table can well withstand the weight of the workpiece , but also the need to ensure the accuracy of its rotation under load . Turntable bearing , as the core component of the turntable , the turntable is running, only to have a high load carrying capacity , the need to have a high rotational accuracy , high resistance to overturning capacity, and high speed capability. In the rotary table design, more bearing types used so broadly divided into categories: Thrust ball bearings Cylindrical roller bearings Thrust ball bearings can withstand axial force , so that the bearings are mainly used to bear the weight of the workpiece ; and cylindrical roller bearings are mainly used to locate the radial and radial withstand external forces ( such as cutting force , milling force, etc. ) . Wide application of such design , and the cost is relatively low . Because a point contact thrust ball bearing , so it's axial capacity is relatively limited , mainly for small or medium-sized machine tool rotary workbench . Thrust ball lubrication is also difficult . Hydrostatic bearing Precision Cylindrical Roller Bearings A hydrostatic bearing by the pressure oil supplied from the outside , in order to achieve the establishment of hydrostatic fluid film bearing lubricated slide bearing in the bearing . Hydrostatic bearings from start to stop always work under liquid lubrication, so there is no wear, long life, start small power ; addition, this bearing also has a high rotational accuracy , film rigidity, can inhibit oil whip advantages. Precision Cylindrical Roller Bearings has a good radial bearing capacity , and thanks to the precision bearings , precision rotary rotary table can be well assured. The use of such design rotary table can withstand high axial force , the weight of some of the work of more than 200 tons or more, more than 10 meters in diameter turntable . But such design also has some shortcomings , because the hydrostatic bearing must be accompanied by a dedicated supply system to supply pressure oil , maintenance is more complex , and the cost is relatively high. Crossed roller bearings Cross roller bearings in the turntable is also more common. Cross roller bearing is characterized by two roller bearings , roller two rows of staggered . Compared with the traditional combination thrust bearing radial -centering bearing , cross roller bearings, compact structure , small size, and simplifies the design table , thereby reducing the cost of the turntable. Further , the use of optimized preload such bearings having high stiffness , rigidity and precision turntable thus also guaranteed. Thanks to the two rows of cross roller design , the effective bearing span can be significantly improved , so these bearings have a high resistance to overturning moment. In cross roller bearings , divided into two types: the first is a cylindrical cross roller bearings , and the second is a conical cross roller bearings. Typically , cylindrical cross- price ratio tapered roller bearings Crossed roller bearings low for a relatively low speed rotary applications ; while tapered cross roller bearings tapered roller rolling pure design, so these bearings have • High precision operation • high speed capability • Reduce the length of the shaft and processing costs , leading to limited thermal expansion changes the geometry • nylon separator , low inertia , low starting torque , easy-to- control angle indexing • Optimized preload, stiffness, beating small • line contact , stiffness, high precision guide rollers running • hardened steel to provide excellent impact resistance and surface abrasion resistance • simple but adequate lubrication When the bearing is installed , customers simply cross roller bearing preload to the recommended values , rather than as the hydrostatic bearing is installed as a complex reconciliation process . Cross roller bearing installation is simple, easy to adjust the form of the original installation or repair methods. Crossed roller bearings are suitable for all types of vertical or horizontal boring machine, as well as vertical mill , vertical lathe and large gear milling applications. All in all, a machine tool spindle bearing turntable and the core components of the operating performance of the machine has played a pivotal role. In order to choose the right size and type of bearings , we need to consider various operating conditions , such as running speed , lubrication, installation type , shaft stiffness, precision requirements. On the bearing itself, the only fully understand its design features and the advantages and disadvantages resulting , we can achieve the best performance out of the bearing.

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