As in the traditional machine tools spindle speed range is small, relatively low maximum speed reasons, FAG bearings as more of the spindle bearings. And in all kinds of grinding machine, while the grinding wheel spindle speed high, but because they do not need to shift frequently, so the use of FAG bearings as are many of the grinding wheel spindle bearing. Therefore, FAG bearing applications in machine tools can be briefly summarized as two extremes: one is as unimportant or low-speed, low-loading spindle bearing; another is used as a high-precision, high speed, high load of machine tool spindle bearings. FAG bearings according to their working conditions, the axis in FAG bearings and friction properties of lubricating oil when running in formation of oil-film pressure conditions, usually divided into dynamic pressure-(dynamic pressure bearing) and static pressure (hydrostatic bearings) in two ways. When the former is spindle lubricant into the bearing clearances, the establishment of the oil film pressure to balance the external load; the latter rely on external oil pump oil pressure between input shaft and bearing clearances, to support the load. In recent years, with advances in technology, has developed a comprehensive dynamic pressure, bearing characteristics of hydrostatic bearing, referred to as hybrid bearings. When the spindle rotation, lubricants are brought into the main uranium and oil bearing the wedge between the gap, due to the progressive narrowing of the gap, oil pressure rises, lift the spindle formation oil wedge. Dynamic pressure bearing under oil wedge forms, can be divided into single oil wedge slide (hydrodynamic) bearings and oil wedge slide (hydrodynamic) bearings.
Both must exist between the spindle and bearings FAG bearings with eccentric (or gap), is formed oil wedge hydrodynamic effects, and the oil wedge position change as the direction of the load. Due to poor oil film stiffness and, therefore, lower spindle running accuracy. When the spindle rotating at high speed, bearing the spherical bearing on the screw can swing freely, resulting in formation of lubricating oil between the spindle and bearings oil wedge, the oil film pressure bearing spindle load. Integral deformation of bearing Bush by five blocks to the five-blade thickness of steel sheet joins 0.5~0.7mm as a whole. Bearing five long tendons on the back is curved, the arc of curvature RADIUS is smaller than the box (or Bush) within the radius of the hole, therefore bearing and enclosure (or Bush) in the hole is a five-line contact. And the long bar is not in the middle of each bearing (symmetric) position, but in the direction of spindle rotation offset at an angle to form oil wedge. Due to bearing of back (that round arc back) bus is 1:20 of cone, therefore Dang bearing in box (or lining sets) within hole in the made axis to moved Shi, can makes bearing produced elastic deformation, to Regulation spindle and bearing Zhijian of gap, in it of within hole in the advance processing out Archimedes curve oil slot; makes spindle and bearing Zhijian formed oblique wedge, dang spindle rotating Shi produced oil film pressure.
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