CNC Knowledge: How to die the internal and external threads?

By taking the machining of the internal thread M30 × 1.5 and the external thread M27 × 3 as examples, we will introduce the strawberry treatment method of the internal thread and the external thread.

1. Preparation of treatment

According to the general process method, determine the method of milling internal and external threads, prepare tooling tools according to the processing method and prepare the programs.

2. Tool list

1. Mison of internal threads

As the figure below shows, the inner wire of M30 × 1.5 in the geometric center of the part drawing is treated.

1) Part material: 45 Standardization of steel, forging. 90 mm × 90 mm × 20 mm
2) Treatment requirements: Ruriousness value of the surface of the rp thread = 1.6;
3) Operating system of the machining center: Fanuc0i
4) Tools: tooth thread striker, 9 -tooth comb cutter

Before dying of the threads with a threading striking fragmentation, the thread base should be treated first, then the processing of the thread must be carried out.

The principle of treatment of the thread of the thread tooth thread is:
Whenever the tool turns for a cycle, the wire step is lowered in the negative direction of the Z axis.

Calculate the diameter of the lower hole of the wire m30 × 1.5: nominal diameter -1.08p = 30-1.62 = 28.38 mm, therefore the hole through the diameter of the threaded lower hole is 28.38 mm . Choose the mill at two teeth of 12 mm, spindle S = 700R / min, the tool material is made of high speed steel, power f = 120 mm / min, the length of extension of the tool is 28 mm and the program is written as follows:

O0001 (program name)

M06T01 (using knife n ° 1)

G54G90G40M03S1200 (program initialization)

G00x0y0z100 (quick positioning of the tool)

Z5

G01Z0F40 (the tool tool enters the surface of the room)

# 1 = -4 (Assign -4 to the local variable # 1)

N10G01Z[#1]F100 (the tool tool between Z-4)

G41D01G01X14.25F120 (fixed cycle, tool radius compensation)

G03I-14.25J0 (round milling in the antihorarous direction for a week)

G40G01X0 (Cancel compensation for the radius of the tool)

# 1 = # 1-4 (Assign # 1-4 to the local variable # 1)

IF[#1GE-20]Goto (conditional discrimination statement, if n ° 1 is greater than -20, go to N10 to continue the treatment)

G00Z100 (Quick knife lifting)

Y150

M05 (spindle stop)

M30 (end of the program)
2. Make sure the lower hole is treated and drill the angle of C1.5 mm with the chamfer ⌀32, select ⌀14 mm of thread striping on a single edge at the mill, Speed ​​S = 1200r / min, F = 120 mm / min as follows:

O0002 (program name)
M06T02 (Change knife number 2)
G54G90G40M03S1200 (program initialization)
G0x0y0z100
Z5 (the tool moves quickly to the positioning point)
G01Z0F40 (the tool tool enters the surface of the room)
# 1 = 0 (assign 0 to the local variable # 1)
N10 # 2 = # 1-1.5 (attribute # 1-1.5 to the local variable # 2)
G42D02G01X14, .19
G02Z[#2]I-4.19 (arc import department)
# 1 = # 1-1.5
IF[#1GE-21]Goto10 (conditional discrimination statement, if # 1 is greater than -21, go to N10 to continue executing the program)
G40G01X0 (Cancel compensation for the radius of the tool)
G00Z100 (Quick knife lifting)
Y150
MO5 (spindle stop)
M30 (end of the program)
3. Select the 9 tooth-cutting (T03) to die the wire, the speed of the spindle S = 1200r / min, F = 120 mm / min. From the treatment of the wire, it has a large quantity. For threads of different specifications, simply select different tools. Examples of application are programmed as follows:

O0003 (program name)
M06T03 (change n ° 3 knife)
G54G90G40M3S1200 (program initialization)
G00x0y0z100
Z5 (positioning of the quick tool)
G01Z0F40 (working on the surface of the room)
# 1 = -12 (Assign -12 to local variable # 1)
N10G01Z[#1]F120
G42D01X14.25 (compensation for the radius of the tool)
G02Z[#1-1.5]I-4.25 (Arc cut)
G40G01X0 (cancel the repair of the knife)
# 1 = # 1-13.5 (attribute # 1-13.5 to the local variable # 1)
IF[#1GE-22.5]GOTO10 (conditional discrimination statement, if # 1 is greater than -22.5, go to N10 to continue executing the program)
G00Z100
Y150 (Quick knife lifting)
M05 (spindle stop)
M30 (end of the program)
2. Mise of external threads

Compared to the method of milling the processing of thread such as cutting-edge tips, the milling method is less limited by tools, etc. shown in the figure below.

O0004 (program name)
M06T04 (Change knife number 4)
G54G90G40M03S1200 (program initialization)
G00x35y0z100 (fast tool positioning)
Z5
G01Z0F50 (the tool tool enters the surface of the room)
G41G01X13.5F120 (compensation for the radius of the tool)
# 1 = 0 (assign 0 to the local variable # 1)
N10 # 2 = # 1-3 (attribute n ° 1 to the local variable # 2)
G02Z[#2]I13.5 (Arc cut)
# 1 = # 1-3 (assign # 1-3 to the local variable # 1)
IF[#1GE-39]Goto10 (conditional discrimination statement, if n ° 1 is greater than -39, go to N10 to continue executing the program)
G40G01X35 (Cancel the repair of the knife)
G00Z100 (Quick knife lifting)
M05 (spindle stop)
M30 (end of the program)

For external wires with height p = 3 mm, the dental depth is 1.949 mm.

The amount of knife for eaters for each treatment can be roughly selected: 0.6 mm, 0.35 mm, 0.3 mm, 0.2 mm, 0.2 mm, 0.1 mm.

Choose a 6 -tooth threaded comb knife:

O0005 (program name)
M06T05 (change n ° 5 knife)
G54G90G40M03S1200 (program initialization)
G00x35y0z100 ()
Z5 (positioning of the quick tool)
G01Z0F50 (working on the surface of the room)
G41D04G01X13.5F120 (compensation for the radius of the tool)
# 1 = -15 (assign -15 to the local variable # 1)
N10 # 2 = # 1-3 (attribute n ° 1 to the local variable # 2)
G02Z[#2]I13.5 (Arc cut)
# 1 = # 1-18 (assign -18 to the local variable # 1)
IF[#1GE-39]Goto10 (conditional discrimination statement, if n ° 1 is greater than -39, go to N10 to continue executing the program)
G40G01X35 (Cancel the repair of the knife)
G00z100 (quick lifting of the knife)
M05 (spindle stop)
M30 (end of the program)