The core methods and practical skills of compound programming for turning and milling on CNC lathes
Youdaoplaceholder0 I. Programming Basics: Understand the processing logic of turning and milling compound processing
Turning and milling compound programming requires simultaneous mastery of the compound motion control of turning (rotating workpiece + tool linear motion) and milling (rotating tool + workpiece linear/curved motion). The core lies in:
Youdplaceholder0 coordinate system definition :
Turning coordinate system (Z-axis is the workpiece rotation axis, X-axis is the radial axis);
Milling coordinate system (X/Y/Z are Cartesian coordinate systems, and B/C axes are rotation axes).
Youdaoplaceholder0 Key point : It is necessary to switch the coordinate system mode in the program (for example, activate the turning mode in G112 of the system and switch back to the milling mode in G111).
Youdaoplaceholder0 tool path planning :
Youdaoplaceholder0 Turning section : Use G-codes (such as G01 linear interpolation, G02/G03 circular interpolation) to control the radial feed of the tool;
Youdaoplaceholder0 Milling section : Complex curved surface processing is achieved through multi-axis linkage (such as 5-axis positioning 3+2 machining). Common instructions include G54.1 (workpiece coordinate system offset) and G43.4 (tool radius compensation).
Youdaoplaceholder0 2. Practical Case: Processing complex rotary parts
Youdaoplaceholder0 task : Process a shaft part with an inner cavity, threads and special-shaped grooves.
Youdaoplaceholder0 steps :
Youdaoplaceholder0 turning stage :
Rough turning outer circle: Use the G71 loop command to quickly remove the allowance;
Precision thread turning: The feed depth and pitch are controlled by the G76 thread cycle command.
Youdaoplaceholder0 code example :
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G99 G40 G21; (Safety Settings: Feed per turn, cancel tool compensation, metric units)
G54 X100 Z10; (Workpiece coordinate system setting
G71 U2 R1; (Rough turning cycle: Each cutting depth is 2mm, and the retraction allowance is 1mm)
G71 P10 Q20 U0.5 W0.1 F0.2 (Finishing allowance: 0.5mm in X direction, 0.1mm in Z direction)
N10 G0 X20; (Starting point of the finishing path
G1 Z-50 F0.1; (Precision machined outer circle
N20 X100; (End of the path
G76 P020060 Q100 R50; (Thread cycle: pitch 2mm, tooth profile Angle 60°, minimum cutting depth 0.1mm, tool withdrawal allowance 0.5mm)
G76 X50 Z-30 P1000 Q200 F2; (Thread end point coordinates: X50, Z-30; thread height 1mm, first cut depth 0.2mm, pitch 2mm)
Youdaoplaceholder0 milling stage :
Youdaoplaceholder0 drilling : Use the CYCLE83 deep hole drilling cycle command;
Youdaoplaceholder0 special-shaped groove processing : Generate a virtual Y-axis through TRANSMIT (end face transformation) or TRACYL (cylindrical surface transformation) to achieve curve milling.
Youdaoplaceholder0 code example (numerical control system) :
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T8 D1; (Call Tool No. 8: φ10mm end mill)
G54 X0 Y0 Z5; (Workpiece coordinate system setting
TRANSMIT; (Activate the end face conversion to generate the virtual Y-axis)
G01 Z-10 F100; (Quickly insert the tool to the machining depth
G01 X20 F50; (Milling straight sections of irregular grooves
G03 X30 Y10 CR=5; (Circular interpolation: radius 5mm
TRAFOOF; (Cancel conversion
Youdaoplaceholder0 multi-axis machining :
Use G68.2 (coordinate system rotation) or G128 (polar coordinate programming) to process helical grooves, avoiding the interference problem of traditional 3-axis processing.
Youdaoplaceholder0 code example :
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G17 G40 G90 G54; (XY plane selection, tool compensation cancellation, absolute coordinates, workpiece coordinate system)
G68.2X0Y0R45; (Rotate the coordinate system 45 degrees around the Z-axis)
G01 X50 Y30 F200; (Processed in the rotated coordinate system)
G69; (Cancel coordinate system rotation
Youdaoplaceholder0 III. Programming Skills: The Key to Improving Efficiency and accuracy
Youdaoplaceholder0 modular programming :
Encapsulate repetitive processes (such as drilling and thread processing) as subroutines (such as O1000) and call them through M98 P1000 to reduce the amount of code.
Youdaoplaceholder0 tool compensation optimization :
When performing rough machining, use G41/G42 (tool radius compensation) to reserve allowance for finish machining.
During finish machining, tool wear is corrected through G43 (tool length Compensation).
Youdaoplaceholder0 simulation verification :
Use the simulation function of VERICUT or UG NX to check the tool path to avoid overcutting or collision. For instance, in the simulation, set the material library and tool parameters to simulate the actual cutting force and temperature.
Youdaoplaceholder0 IV. Industry Application Scenarios and Innovative gameplay
Youdaoplaceholder0 aerospace :
When processing turbine blades, the blade profile is formed in one go through the 5-axis linkage function of turning and milling compound, reducing the number of clamping times and improving the surface roughness to Ra0.8.
Youdaoplaceholder0 medical equipment :
When processing artificial joints, CYCLE60 (engraving cycle) is used to endow microstructures on the surface of titanium alloy to enhance the bone bonding strength.
Youdaoplaceholder0 programming :
Automatically generate the optimal tool path, for instance, by optimizing cutting parameters (spindle speed, feed rate) through reinforcement learning, thereby increasing processing efficiency by 20%.
Interactive Discussion Which specific scenario of turning and milling compound programming do you pay more attention to? For example:
How to optimize the multi-axis linkage code for complex surfaces?
How can the online detection function of turning and milling compound machine tools be combined with programming?
Which industries have the most urgent demand for intelligent turning and milling compound programming?
Welcome to keep asking questions. I will provide you with in-depth answers based on actual cases!
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