The machining accuracy of vertical lathes continues to improve with the development of techniques in recent years. High-precision, high-speed machine tool products are popular on the market. Crossed roller bearings play a key role in improving the accuracy of vertical turning and a boring mill.

Traditional vertical lathe bearings and crossed roller bearings

In the vertical spindle structure, the spindle bearing, as the core component of the table rotation, plays a vital role in ensuring its rotation accuracy. The traditional vertical spindle structure has two bearings to support the spindle. Thrust ball bearings bear axial loads, and cylindrical roller bearings mainly bear radial loads. The shortcomings of this structure are that there are many structural parts, large axial dimensions, and cumbersome adjustment leading to reduced overall structural rigidity.

Crossed roller bearings rollers are placed crosswise on the raceway, with each other perpendicular to the adjacent one. So the bearing can bear axial load, radial load, overturning moment, and other combined loads at the same time. Although the cross-section of the bearing is small, its rigidity is very high. Therefore the design of the equipment can be more compact, which reduces the height of the center of gravity of the table and the weight of the spindle structure. There are fewer adjustments need to make, and the rigidity of the overall structure of the spindle is greatly improved, which makes the worktable run more smoothly.

Application Summary

The application of crossed roller bearings in vertical lathes has been very successful. It greatly improves the accuracy of the machine tool, and its geometric accuracy has been significantly improved during high-speed rotation. However, it is undeniable that there are still many shortcomings that restrict the use of bearings. If the individual size of the bearing is very different, the size of the relevant parts will be restricted. Of course, with the improvement of machining technology level and the rapid development of assembly methods, the application of cross roller bearings in vertical lathe will become more and more widespread.