English Author: Site Editor Publish Time: 2026-01-23 Origin: Site
The key to adjusting the rotational handover accuracy of the secondary spindle lies in the dynamic synchronous control , which is achieved through the feedback of the precision encoder and real-time error compensation. The following are the specific adjustment methods:
I. Core Methods for Precision Adjustment
Dynamic synchronous docking technology
Principle : The secondary spindle dynamically moves to the docking position during rotation and synchronizes its speed and phase with the main spindle in real time.
Key : The positions of the two axes are detected in real time through precision encoders (such as sine and cosine encoders) and fed back to the numerical control system.
Effect : Avoid errors caused by mechanical clearance and inertia, and achieve micron-level precision control.
Precision encoder feedback and calibration
The function of is : it provides high-resolution position signals and serves as the foundation for error compensation.
Operation : Regularly calibrate the encoder to ensure the accuracy of the feedback signal; Check whether the encoder is installed firmly to avoid loosening.
Real-time error compensation
Principle : The numerical control system calculates the deviation based on the encoder signal and dynamically adjusts the speed and phase of the spindle motor through the servo driver.
Compensation content : including position deviation, speed fluctuation, mechanical clearance, etc.
Effect : Keep the docking accuracy within 0.015mm .
Ⅱ. Key Factors Affecting Accuracy and Adjustments
Mechanical structure accuracy
Main shaft bearing : Ensure that the bearing clearance is appropriate to avoid axial movement and radial runout. When adjusting, the shaft needs to be rotated by hand to feel flexible and free of axial movement.
Spindle axis line : Adjust the parallelism between the secondary spindle and the worktable to ensure that the levelness of the two spindle areas is consistent.
Structural rigidity : High-rigidity bed structures (such as marble or specially treated cast iron) are adopted to reduce vibration and thermal deformation.
Transmission system accuracy
Coupling and lead screw : Check the clearance and wear of the transmission components, and replace or adjust them in time.
Guide rail lubrication : Keep the guide rails well lubricated to reduce friction and crawling.
Control system parameters
Servo gain : Adjust the P, I, and D parameters of the spindle servo motor to optimize the response speed and stability.
Interpolation algorithm : Select a high-precision interpolation algorithm to enhance the accuracy of trajectory control.
Ⅲ. Precision Verification and Daily Maintenance
Accuracy verification method
No-load operation : Observe whether there is any abnormal vibration in the movement of each axis.
Trial cutting processing : Measure the processing accuracy of the workpiece and verify the adjustment effect.
Regular review : It is recommended to check the level status and accuracy every 3 months or after a cumulative operation of 500 hours.
Key points for daily maintenance of
Cleaning and maintenance : Clean the appearance of the machine tool, guide rails, cooling system and cutting tools every day.
Lubrication inspection : Regularly check the lubrication conditions of the main shaft bearings, lead screws and guide rails.
Accuracy detection : Regularly detect geometric errors using measuring equipment such as laser interferometers and ballbar gauges.
Iv. Professional Operation Suggestions
Operator : Must undergo professional training, be familiar with the operation principles, programming methods and precision adjustment processes of the machine tool.
Complex adjustments such as the adjustment of main shaft bearings and geometric error compensation should be carried out by professional technicians.
Record preservation : After each adjustment, record the data in detail and establish an equipment accuracy file.
