Application of Crossed Roller Bearings in High-end Machine Tools and Processing Equipment

Crossed roller bearings play a central role in high-end machine tools and processing equipment, particularly in critical areas requiring ultra-high precision, high rigidity, compact design, and the ability to handle composite loads. Their application scenarios and technical value are as follows:

1. CNC rotary tables and indexing plates

Function: As the core rotational support for the workbench, it bears overturning moments plus axial/radial composite loads (e.g., cutting forces in vertical lathes).

Advantages:

- Replaces traditional double-row angular contact ball bearing combinations, simplifying the structure (reducing parts by over 50%) and eliminating preload adjustment errors.

- Rotational precision ≤0.001mm, ensuring positioning repeatability in five-axis simultaneous machining.

- High rigidity: overturning stiffness is 3–5 times that of ordinary bearings, suppressing cutting vibrations.

2. Direct-drive motor turntable

Function: Directly integrated into the direct-drive motor rotor to transmit torque and support loads.

Advantages:

- Ultra-thin design (e.g., CRBT series width as low as 5 mm) reduces axial space and enhances system rigidity.

- Zero backlash: Eliminates transmission chain errors, enabling nanometer-level motion control (e.g., wafer cutting positioning).

- Hollow structure: Provides channels for cables/coolant (e.g., in milling-turning centers).

3. Precision Spindle Unit

Function: Used for auxiliary support in high-speed electric spindles, grinding heads, etc.

Advantages:

- High-speed stability: DN value up to 1.5×10⁶ (with optimized lubrication), temperature rise 30% lower than tapered roller bearings.

- Micro-vibration resistance: Crossed roller 90° layout dampens vibration transmission, improving surface finish quality (Ra ≤ 0.1μm)

Comparison of Key Technological Advantages:

Summary:

With their minimalist design, extreme precision, and extreme rigidity, cross roller bearings have become the core component for high-end machine tools to achieve micron-level machining, directly determining the performance ceiling of the equipment.