1. Process Analysis
(1) Determine the treatment route
The machining route is determined according to the machining principle of machining first, roughing then fine, using fixed cycle instructions to machine the outer contour, then finish machining, then turn the groove of the tool, then process the thread and finally cut.
(2) Tightening method and tool set point selection
A three-claw self-centering chuck is used for self-centering clamping, and the tool setting point is selected at the intersection of the right end face of the workpiece and the rotation axis.
2. Choice of cutting tools
According to the processing requirements, four knives are selected, No. 1 is a roughing cylindrical turning tool, No. 2 is a finishing cylindrical turning tool, No. 3 is a grooving tool, and No. °4 is a threading tool. Use the trial cutting method to set the tool and process the end face while setting the tool.
3. Selection of cutting parameters
Table 1 shows the cutting speed and feed rate of each process.
Table 1 Cutting parameters of each process
Processing steps | Tool number | Tool type | Spindle speed S( ) | Feed rate F( ) | |
Rough turning outer circle | T1 | External turning tool | 336 | 0.3 | |
Fine-turned outer circle | T2 | External precision turning tool | 475 | 0.08 | |
Cutting groove | T3 | Grooving knife | 336 | 0.05 | |
Thread, concave arc | T4 | thread cutter | 170 | 1.5 | |
cut | T3 | Grooving knife | 336 | 0.05 |
4. Programming(The CNC lathe is CAK6150D from Shenyang First Machine Tool Factory and the CNC system is FANUC-0i) Determine the intersection O of the right end surface of the workpiece and the center line of the axis as the programming origin. The part processing program. is as follows:
program | illustrate |
O0004; | |
N1; | process (A)Rough contour machining |
G40G97G99T0101; | |
M43; | |
M03; | |
G00X40.0Z1.0 ; | |
G71U1.5R0.5; | |
G71P10Q11U0.5W0.1F0.15; | |
N10G00G42X0 ; | |
G01Z0; | |
X19.8 | |
X27.8Z-20.0; | |
X28.0; | |
Z-45.0; | |
X36.0Z-50.0; | |
Z-59.0; | |
N11G01G40X40.0; | |
G00X100.0Z100.0 ; | |
N2; | process (two)Contour finishing |
T0202; | |
M44; | |
G00X40.0Z1.0 ; | |
G70P10Q11F0.08; | |
G00X100.0Z100.0 ; | |
N3; | process (three)Grooving |
T0303; | |
M43; | |
G00X30.0Z-24.0; | |
G01X24.0F0.05; | |
G01X30.0F0.2; | |
G00X100.0Z100.0 ; | |
N4; | process (Four)Processing of conical thread and concave arc |
T0404; | |
M41; | |
G00X30.0Z5.0 | |
G92X28.4Z-22.0R-5.4F1.5; | |
X27.8; | |
X27.4; | |
X27.2; | |
X27.0; | |
X26.9; | |
X26.85; | |
X26.85; | |
G00X32.0; | |
Z-27.0; | |
M44; | |
M98P041234; | Call O1234subroutine4Secondary treatment of concave arc surface |
G00X100.0Z100.0 ; | |
N5; | process (five)Cutting of parts |
T0303; | |
M43; | |
G00X40.0Z-59.0; | |
G75R0.5; | |
G75X0P2000F0.05; | |
G00X100.0Z100.0 ; | |
M05; | |
M30; | End of program |
O1234; | subroutine |
G01U-1.0F0.1; | The tool advances radially 1 mm each timeConcave arc surface treatment |
G02U0W-18.0R20.0; | |
G01U3.0F0.5; | |
W18.0; | |
U-3.0; | |
M99; | End of subroutine call |
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