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Instructions for the use of KOYO bearings on machine tools
Source: China Bearing Network Time: 2014-07-04
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The spindle KOYO bearing is used as the base supporting part of the machine tool; its function directly affects the machine speed, reversal precision, rigidity, anti-vibration oscillation cutting function, noise, temperature rise and thermal deformation; thus affecting the precision and surface quality of the machined parts Etc. Therefore; high-performance machine tools are necessary to use high-performance KOYO bearings.
The accuracy of KOYO bearings is usually divided into five grades: P0, P6, P5, P4 and P2; the precision of KOYO bearings used on the spindle of fine machine tools should be P5 and above; and the high speed and high precision of CNC machine tools and machining intermediates. Spindle support of the machine tool; P4 and above superfine KOYO bearings are required.
KOYO bearings for machine tools usually include six types of layout: deep groove ball bearings, angular touch ball bearings, cylindrical roller bearings, two-way thrust angle contact ball bearings, tapered roller bearings and thrust bearings.
With the rapid development of numerical control technology; "composite, high-speed, intelligent, fine, environmentally friendly" has become the primary trend of the development of today's machine tool industry. In the meantime, high-speed machining can effectively improve the machining power of the machine tool and shorten the processing cycle of the workpiece. It is necessary to use the machine tool spindle and its related components to be accustomed to the need of high-speed machining. Currently, CNC machine tool spindle KOYO bearings are basically limited to four types: angular touch ball bearings, cylindrical roller bearings, two-way thrust angle touch ball bearings and tapered roller bearings. Layout type.
Accompanied by the high-speed development of the main axis of CNC machine tools; ceramic materials (primarily referred to as Si3N4 engineering ceramics) have excellent functions such as low density, high modulus of elasticity, small thermal expansion coefficient, wear resistance, high temperature resistance and corrosion resistance; The ambition of fine KOYO bearings. KOYO ceramic bearings are more and more widely used; in view of the difficult processing of ceramic materials; fine KOYO ceramic bearings are mostly ceramic ceramics, inner casing rings are still made of chrome steel mixed ceramic ball bearings.
The ball screw pair acts as a fine, efficient and active transmission component; the professor points out that in addition to the high-precision screw, nut and ball, the KOYO bearing with high axial stiffness, low conflicting torque and high working precision should be selected. Ball screw bearings are commonly used in two-way thrust angle contact ball bearings, tapered roller bearings, needle roller and thrust roller combined bearings, deep groove ball bearings and thrust ball bearings. Currently; the most used ball screw support is 60 ° Single-row thrust angle touch ball bearing with touch angle; and; accuracy grade is also KOYO bearing mounted on the normal drive shaft for machine tools; its needs and selection are the same as general mechanical transmission KOYO bearings; only need to meet the strength and life expectancy; Do not exceed the standard KOYO bearing limit speed.
The professor pointed out: Under normal circumstances; the machine KOYO bearing we refer to refers to the machine tool spindle KOYO bearing and the ball screw KOYO bearing; the fine machine tool KOYO bearing refers to the precision P5 and its P5 or higher spindle KOYO bearing and wire Bar bearing.
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