Rotary bearing CNC drilling machineIt is a specialized CNC machine tool for high-precision drilling, tapping, and milling of large slewing bearings (also known as rotary bearings), widely used in the manufacturing of high-end equipment such as wind power, engineering machinery, port machinery, metallurgical equipment, radar turntables, and heavy robots. As the core transmission component connecting rotating and fixed parts, the slewing bearing has dozens to hundreds of high-precision mounting holes distributed on its end face or inner and outer rings. The requirements for hole position accuracy, pitch diameter consistency, and surface quality are extremely strict, and traditional processing methods are difficult to meet the requirements of high efficiency and high precision.
This drilling machine adopts a high rigidity gantry or vertical structure, equipped with a high torque servo spindle and an automatic tool changing system, which can achieve multiple processes such as drilling, reaming, countersunking, tapping, and even light milling in one clamping. The core feature is the integration of high-precision CNC rotary worktable (usually dual drive or torque motor direct drive), with a division accuracy of up to ± 5 ", combined with fully closed-loop grating feedback, ensuring that the position error of each bolt hole on the large diameter (usually 2-6 meters) circumference is controlled within 0.02 mm. The machine tool is also equipped with laser alignment, automatic alignment, and workpiece recognition system, which can adapt to the rapid replacement of different specifications of rotary bearings.
Rotary bearing CNC drilling machineOperation steps:
1、 Preparation before operation
environment check
Clean up obstacles around the machine tool, ensure that the ground is free of oil and water, and prevent slipping.
Check whether the outer skin of cables and wires is damaged to avoid the risk of electrical leakage.
Confirm that the connecting bolts of each part of the machine tool are not loose, and that the protective cover and cover plate are installed in place.
Equipment inspection
Lubrication system: Check the lubrication condition of the column guide rail, rocker arm guide rail, spindle bearing, lifting screw and other parts to ensure sufficient oil volume and smooth oil circuit.
Hydraulic system: Check whether the oil level of the hydraulic unit is within the scale range, whether the pipeline joints are tightened, and whether the solenoid valve electromagnet is well fixed.
Cooling system: Confirm that the coolant volume is moderate, there is no chip accumulation, and avoid affecting heat dissipation and cutting efficiency.
Electrical system: Check whether the electrical equipment is complete, whether the circuit configuration is intact, and promptly deal with any problems found.
Preparation of workpieces and fixtures
Select appropriate fixtures (such as flat pliers, pressure plates, etc.) based on the shape of the workpiece and processing requirements to ensure that the workpiece is clamped smoothly and firmly.
Clean the workpiece reference surface and fixture surface to avoid impurities affecting machining accuracy.
2、 Startup and initialization
Power on
After confirming that there are no personnel or obstacles around the machine tool, turn on the power.
Observe the machine tool display screen and check for any alarm messages. If so, troubleshoot the issue first.
Mechanical zeroing
Start the CNC system, perform mechanical zeroing operation to return each axis to the reference point, and establish the machine coordinate system.
trial operation
Run each axis (X, Y, Z axis) at low speed in manual mode to confirm smooth movement and no abnormal noise.
Check if the spindle rotation direction is correct (confirmed by trial operation or jogging).
3、 Programming and Parameter Setting
Coordinate system setting
Select the origin of the workpiece coordinate system (such as the corner point, center point, or reference hole center) based on the shape of the workpiece and the clamping method.
Enter the origin coordinates in the CNC system and establish a workpiece coordinate system.
Programming unit selection
Select the programming unit (millimeter or inch) according to the processing requirements, and set it at the beginning of the program (e.g. G21 represents millimeter, G20 represents inch).
Write processing programs
Basic instructions:
G00: Quick positioning, used for quickly moving the tool to the starting point of machining.
G01: Linear interpolation, used for straight line machining such as countersunking and hole drilling.
G81: Ordinary drilling cycle, suitable for general depth drilling.
G83: Deep hole pecking drilling cycle, suitable for deep hole machining, using segmented drilling to remove chips.
Parameter Settings
Set the spindle speed (S value), feed rate (F value), and cutting depth (Z value) based on the material properties and aperture size.
For deep hole machining, it is necessary to set the incremental depth of each drilling (Q value, such as Q10.0 in G83, which represents 10mm per drilling).
4、 Processing operation
Knife loading and alignment
Install the drill bit while the mechanical motion is stopped, ensuring that the drill bit is concentric with the spindle.
Perform trial cutting and adjust the tool compensation value by measuring the position and size of the trial cutting hole.
Start processing
Close the protective sliding door and activate the automatic cycle processing mode.
Observe the machining process to ensure smooth tool movement and normal chip discharge.
Manual intervention (if necessary)
When manual operation is required during spindle rotation, keep your body and clothing away from the rotating parts.
When manually or automatically changing knives, pay attention to the rotation position of the knife tower, knife magazine, and robotic arm to avoid collision injuries.
5、 Post processing treatment
Shutdown and power outage
After processing, return the tool to a safe position and turn off the spindle and cooling system.
Disconnect the power supply and clean the chips and oil stains on the machine guide rail and worktable.
quality inspection
Use measuring tools such as calipers and micrometers to check the aperture size, positional accuracy, and surface roughness.
If non-conforming products are found, the reasons need to be analyzed and processing parameters or programs adjusted.
Recording and maintenance
Fill in the work log to record processing parameters, tool usage, and equipment status.
Regularly maintain the machine tool and replace worn parts (such as drill bits, guide rail lubricating oil, etc.).