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Method of improving the properties of spindle Assembly
- Aug 01, 2016 -

In ensuring the spindle manufacturing precision bearings and precision at the same time, proper bearing preload and the adoption of measures such as the directional error of bearing Assembly also can further enhance the spindle rotation accuracy and stiffness, for different types of bearings and tightening devices and methods vary, commonly preload method of mechanical design is available.

In ensuring the spindle manufacturing precision bearings and precision at the same time, proper bearing preload and the adoption of measures such as the directional error of bearing Assembly also can further enhance the spindle rotation accuracy and stiffness, for different types of bearings and tightening devices and methods vary, preload commonly used methods are available "basis of mechanical designing" aspects of the book, and will not repeat them here.

1. The directional error of rolling bearing Assembly

Spindle front end must be positioned surfaces (cylindrical surface or the surface of the tapered hole before). Prior to installing the bearings, you must first measure the surface of the inner ring of the bearing and position radial runout, and then pressing the directional fitting method to assemble bearings, can improve the Rotary precision of spindle.

1) with cylindrical surfaces of the spindle

Due to technological reasons, the spindle shaft surfaces with front cylindrical localization of radial circular run-not only in the same axial plane and in the same direction and runout on impact of bearing Assembly is very small, can be ignored;

The Assembly should make front and rear axle maximum radial runout in the same axial plane, and with the side of the axis, which can reduce the radial runout of spindle end, improve the accuracy of spindle rotation.

2) has a surface of the tapered hole of the spindle

Due to technological reasons, the spindle shaft surfaces and surface cannot be processed in a single clamping taper hole formed, must be relative to the axis of radial circular run.

When assembling the spindle bearing inner ring both before and after the radial circle jump momentum and center line of spindle taper hole deviation within the same axial plane and assembled in a certain direction in order to improve the accuracy of spindle rotation.

2. After Assembly finish machining

Special precision spindle components, such as coordinate boring machine spindle, spindle bearings mounted on the sleeve, spindle bore runout tolerance of only 1 µ m-2 µ m. In order to ensure the accuracy of spindle Assembly, Assembly after finishing methods can be used, namely spindle components assembled, based on both ends of the spindle taper hole grinding spindle sleeve outer circle; the sleeve od as the benchmark, grinding shaft taper bore.

After using these methods very high rotation accuracy of precision machine tools, repair if necessary dismount, prior to demolition, in the bearing inner ring and outer ring with the spindle box (or spindle sleeve) should make a mark, mark put when it is assembled, otherwise after reloading accuracy is difficult to control.