CNC milling program introduction

Through a simple numerical control car parts, introduce the machining process of the parts and CNC machining program to further understand the structure, characteristics and common code meaning of the CNC car program. Parts are shown below.

Figure NC vehicle programming examples

Numerical control programming uses imaginary tool tip programming. The roughing program of the CNC car is shown in Table 1, and the NC car finishing program is shown in Table 2.

Table 1 NC car roughing program

Program content

Program description

The beginning of the program

O5555;

The program number is O5555

N1(RONXH OF CUT);

Roughface and Cylindrical Procedures

G50 S2000;

The maximum spindle speed setting, the maximum speed is 2000RPM

G28 U0;

Back to X axis machine reference point

G0 T0808 M8;

Automatic adjustment No. 8 left-side offset No. 8 tool offset, open coolant

G96 S150 M4;

Constant linear speed turning, cutting speed 200m/min, spindle reversal

Continued

Program content

G0 Z5.0;

The tool moves in the Z direction to the starting point Z5.0

X65.0;

The tool moves in the X direction to the starting point X65.0

G72 W1.0 R1.0;

Face roughing cycle, each face cutting 1mm, retract distance 1mm

G72 P10 Q20 U0 W0.3 F0.22;

Rough cutting cycle cutting parameters are set, the starting block is 10, the ending block is 20, the balance of finished car is 0, and the end face is 0.3mm

N10 G0 Z0;

Tool quickly moves from X65.0, Z5.0 to X65.0, Z0

N20 G1 X-1.0 F0.2;

Car end face from X65.0 to X-1.0, feed rate 0.22mm/r

G0 X60.0 Z2.0;

Quick retraction to the outer circular circle of the vehicle from the point X60.0, Z2.0

G71 U2.0 R1.0;

Cylindrical roughing cycle, each cutting depth 1mm, retract distance 1mm

G71 P30 Q40 U0.6 W0.1 F0.3;

Cylindrical roughing cycle cutting parameter setting, starting block is 30, ending block is 40, fine wheel allowance is 0.6, face is 0.1mm, feed rate is 0.3mm/r

N30 G0X 30.0;

Define the finishing path from block 30 to block 40, assuming tool tip programming. Note:

1 In the program, the offset value of the tool nose arc R0.8mm used in the finishing line in each block is added to the value of the coordinate point.

2 Feed rate 0.15mm/r is fine feed

G1 Z-15.705 F0.25;

X45.0 Z-46.705;

Z-60.0;

N40 X62.0;

End of program

G28 U0 M5;

Return to X axis machine reference point, spindle stop

G0 Z300.0;

Back to Z axis direction reference point

M1;

Program selection stop

Table 2 CNC car finishing program

Program content

Program description

The beginning of the program

N2 (FINISH OF CUT);

Finishing car and cylindrical program

G50 S2000;

The maximum spindle speed setting, the maximum speed is 2000RPM

G28 U0;

Back to X axis machine reference point

G0 T1010 M8;

Automatic adjustment No. 10 left-handed knife No. 10 tool compensation, open the coolant

G96S200M3;

Constant linear speed turning, cutting speed 200m/min, spindle positive rotation

Program content

G0Z2.0;

The tool moves in the Z direction to the starting point Z2.0

X65.0;

The tool moves in the X direction to the starting point X65.0

G70P10Q20;

Finishing cycle

G70P30Q40;

Cylindrical finishing cycle

End of program

G28U0;

Back to X axis machine reference point

G0 Z300.0;

Back to Z axis direction reference point

M30;

Program stop

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