Important application of rolling bearings in stone engraving machines

The use of rolling bearings on the engraving machine is mainly used in the following three parts: the main shaft, the ball screw and the general drive shaft. This is an important part of the engraving machine.

As the basic accessory of the machine tool, the spindle bearing directly affects the speed, rotation accuracy, rigidity, anti-shake vibration cutting performance, noise, temperature rise and thermal deformation of the machine tool, which affects the precision and surface quality of the machined parts. Therefore, high-performance machines must be equipped with high-performance bearings.

The accuracy of rolling bearings is generally divided into five grades: P0, P6, P5, P4 and P2. The accuracy of bearings used on precision machine tool spindles should be P5 and above, and for high-speed, high-precision machine tools such as CNC machine tools and machining centers. For the spindle support, P4 and above super precision bearings are required.

Spindle bearings for machine tools usually include six types of construction: deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, two-way thrust angular contact ball bearings, tapered roller bearings and thrust bearings.

With the rapid development of numerical control technology, "composite, high speed, intelligent, precise, environmental protection" has become the main trend of the development of today's machine tool industry technology. Among them, high-speed machining can effectively improve the machining efficiency of the machine tool and shorten the machining cycle of the workpiece. This requires the machine tool spindle and its related components to meet the needs of high-speed machining. At present, CNC machine tool spindle bearings are basically limited to four types of structural types: angular contact ball bearings, cylindrical roller bearings, two-way thrust angular contact ball bearings and tapered roller bearings.

With the development of high-speed main axis of CNC machine tools, ceramic materials (mainly referred to as Si3N4 engineering ceramics) have high performance due to their low density, high modulus of elasticity, small coefficient of thermal expansion, wear resistance, high temperature resistance and corrosion resistance. The ideal material for precision bearings. Ceramic bearings are used more and more widely. In view of the difficult processing of ceramic materials, the precision ceramic bearings are mostly mixed ceramic ball bearings whose rolling elements are ceramics and whose inner inner ring is still made of chrome steel.

As a precise, efficient and sensitive transmission component, the ball screw pair should be equipped with high-precision lead screws, nuts and balls, as well as bearings with high axial rigidity, low friction torque and high running precision. The ball screw supports the conventional two-way thrust angular contact ball bearings, tapered roller bearings, needle roller and thrust roller combined bearings, deep groove ball bearings and thrust ball bearings. At present, the ball screw support adopts a single row thrust angular contact ball bearing with a maximum contact angle of 60°, and the accuracy grade is mainly P4 and above. The rolling bearing for the machine tool mounted on the general drive shaft has the same requirements and options as the ordinary mechanical transmission bearing. It only needs to meet the strength and life requirements, and the speed does not exceed the specified bearing limit speed.

In the stone machinery, under normal circumstances, the rolling bearing of the machine tool we refer to refers to the spindle bearing of the machine tool and the ball screw bearing. The precision machine tool bearing refers to the spindle bearing and the screw bearing with the accuracy of P5 and above.  

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