The Role Of Couplings in CNC Machine Tools

Couplings are core components of the transmission system in CNC machine tools. They connect the spindle to tools/fixtures (such as cutting tools), enabling precise transmission of torque (50-500 Nm), speed (100-6000 rpm), and direction of motion, while compensating for axial/radial deviations (±0.1-5 mm). Flexible couplings absorb vibration through metallic elastomers (deformation rate 15-30%), suitable for high-precision machining applications; gear couplings use hardened gears (hardness HRC58-62) for meshing transmission, suitable for high-torque, heavy-load conditions; universal joint couplings support 5°-10° deflection angles, solving the problem of limited space in multi-axis applications. Selection must match the machine tool's load characteristics (e.g., dynamic stiffness ≥100 N/μm). During installation, alignment accuracy (≤0.05 mm) must be maintained, and regular lubrication is required (grease replacement cycle 3-6 months) to avoid transmission failure due to overload (safety factor ≥1.5).