In CNC machining centers, the performance of the lubrication and cooling system directly affects machining accuracy, spindle life and surface quality.
The hydraulic pump, as the oil supply source, must provide stable flow, sufficient pressure and reliable operation under varying thermal and load conditions.

A structured selection method helps ensure stable machining performance and long-term equipment reliability.

Flow Rate Requirement

Flow rate determines whether cooling and lubrication can be evenly distributed across the spindle, tool and work area.

Typical requirement:
10–100 L/min depending on machine size and cooling system design

Selection principle:
Match spindle power, cutting zone size and cooling layout

Insufficient flow leads to poor heat dissipation and uneven lubrication
Excessive flow increases energy consumption and oil temperature rise

Operating Pressure

CNC machining requires stable oil pressure to maintain lubrication film integrity and cooling effectiveness.

Recommended range:
10–25 MPa

Stable pressure ensures:
Consistent lubrication of precision components
Reliable operation under long-duration machining

Oil Viscosity Compatibility

The pump must operate reliably across a wide viscosity range due to temperature variation.

Typical range:
10–1000 cSt

Proper viscosity matching helps maintain:
Stable flow characteristics
Reduced wear and improved efficiency

Noise Control

Noise directly affects machining environment and precision perception.

Recommended requirement:
Low pulsation design
Noise level typically below 70 dB(A)

Internal gear pumps are well suited due to their low vibration and stable flow output

Drive Type Compatibility

CNC systems are typically driven by electric motors.

Recommended configuration:
Direct motor drive or coupling connection

Proper matching ensures:
Stable operation
Efficient power transmission

Temperature Adaptability

CNC machining generates heat, especially in continuous cutting operations.

Typical requirement:
-20°C to +80°C

For high-temperature environments, select pumps with heat-resistant seals and materials

Materials and Sealing

Material selection must consider oil properties and operating conditions

Common configurations:
Cast iron housing for general industrial use
Stainless steel for high cleanliness or special fluids

Seal materials:
NBR for standard conditions
FKM or PTFE for high temperature and chemical resistance

Recommended Pump Models

Key Selection Considerations

Pressure matching
Ensure the pump meets system pressure requirements to maintain lubrication performance

Flow matching
Select flow based on cooling demand to avoid insufficient lubrication or energy waste

Noise and stability
Prioritize low-noise, low-vibration pumps to improve machining accuracy and operator comfort

Summary

Pump selection in CNC machining centers should balance flow, pressure, temperature and noise performance.

A well-matched pump provides:

Stable lubrication and cooling

Improved machining accuracy

Reduced thermal impact

Reliable long-term operation