Internal thread milling program on XY plane For CNC boring and milling machine tools (machining center), the thread milling program is mainly programmed with G02 and GO3 circular interpolation commands to form a helical interpolation motion. The following is a subroutine list used by the Siemens 8M system: N1 R1O 0.8S6 R12 4 R50 0;
R52 2 R53 R02 0
R54 0
N2 R30×RO9 R00 0 R30/R32;
N3 R01 R30 R00 0 R06/R51;
N4 R01 R06 R00 0 R01-R01;
N5 R01/R52 R00 0 R02 R01;
N6 R02/R52 R00 0 R54 R01 ;
N7 R54×R51 R00 0 R05 R54 ;
N8 G64 G91 G01 Z-R05 FR08 M03; cutting tool enters hole bottom N9 G03 X-R01 Y0 PR2; arc cut into maximum outer diameter N10 G03 X0 Y0 IR01 J0 ZR9; helical interpolation milling one button N11 R50 R09; processed length Add a pitch N12 @02-10 R5 R50; judge R05>R50, jump to N10 segment N13 G00 XR01 M05; R05≤R50, the tool retreats to hole center N14 G90 G60 M17; subroutine end program is processed right For the design of the internal thread, the general parameter subroutine for the left-hand internal thread can also be programmed in the same way.
4 Conclusion
The use of cyclone milling to machine large precision internal threads can strictly control the medium diameter tolerance, with good machining accuracy and high efficiency. Programming is relatively simple due to the use of subroutine technology. And for different types of threads, only need to modify the parameters in the program, the program can be saved in the CNC system, recalled during processing, suitable for mass production. We used a large internal thread of the M200 for cyclone milling on the XK713 CNC machine. The results show that the machining efficiency is 40% higher than that of the conventional method, and the machining accuracy is easy to control.
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