Technical

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VHM End Mills for General Use - DARMET

Recommended machining parameters for VHM end mills for general use:

Machined materialsCutting speed
[m/min]
Feed per tooth [mm/tooth]
?3?4?6?8?10?12?16?20
Unalloyed steel 60 ÷ 90 0,014 0,020 0,028 0,038 0,049 0,063 0,082 0,10
Unalloyed and alloyed steel 60 ÷ 90 0,014 0,020 0,028 0,038 0,049 0,063 0,082 0,10
Alloyed steel 30 ÷ 50 0,010 0,014 0,019 0,026 0,034 0,045 0,058 0,075
Alloyed steel 30 ÷ 50 0,009 0,013 0,018 0,024 0,031 0,041 0,053 0,069
Hardened alloyed steel 30 ÷ 50 0,009 0,013 0,018 0,024 0,031 0,041 0,053 0,069
Stainless and acid-resistant steel 30 ÷ 50 0,009 0,013 0,018 0,024 0,031 0,041 0,053 0,069
Stainles and acid-resistant steel with higher chromium and nickel content 20 ÷ 35 0,004 0,006 0,008 0,011 0,014 0,018 0,024 0,031
Grey cast iron 40 ÷ 90 0,015 0,022 0,031 0,042 0,054 0,070 0,091 0,119
Ductile cast iron, malleable cast iron 40 ÷ 90 0,015 0,022 0,031 0,042 0,054 0,070 0,091 0,119
Titanium 25 ÷ 45 0,010 0,015 0,021 0,029 0,037 0,048 0,062 0,082
Titanium alloys 20 ÷ 40 0,009 0,013 0,018 0,024 0,031 0,041 0,053 0,069
Aluminium, copper 70 ÷ 100 0,009 0,012 0,017 0,023 0,030 0,039 0,050 0,066
Aluminium alloys, copper alloys 200 ÷ 500 0,014 0,021 0,030 0,039 0,051 0,066 0,086 0,113
Plastics 100 ÷ 150 0,014 0,020 0,028 0,038 0,049 0,063 0,082 0,106

 

AlTiN coating:

Materials aluminium and titanium nitrade
Properties blue/grey colouring
coating temperature 450 - 500 ?C
hardness approx. 3300 - 3500 HV 0,05
thickness 1 ? 4 ?m
coefficient of friction 0,4 - 0,5
max. working temperature approx. 900 ?C
Foundations cemented carbides
cermet
powder and standard high-speed steel
Application tools with endurance limited by high temperatures and oxidation occuring during cutting of hard materials, dry cutting and high-speed cutting
cutting tools for machining steel with hardness up to approx. 50 HRC
high speed machining

 

Advantages of coating:

  1. Lengthens life-period of the tool
  2. Better quality of the machined surface
  3. Higher machining efficiency by minimum 100% due to:
    • higher machining parameters
    • high flute hardness
    • lower coefficient of friction
    • large thermal conductivity (faster heat removal from the cutting area)
    • very good adhesion of the layer to the tool surface (protects working surfaces against crushing)

 

 

Indexable Milling Inserts DARMET - Technical Information


INSERTS DESIGNATION (ISO CODE)


  1. 2. 3. 4. 5. 6. 7. - 8. 9.
Designation Insert shape and angle Normal clearance angle Tolerance class Chipbreaker and clamping type Edge length Insert thickness Corner radius/ Finishing edge   Cutting edge condition Cutting direction
Example C N M G 12 04 08 - E N

1. Insert shape and angle

ksztalt plytki


2. Normal clearance angle

kat przylozenia


3. Tolerance class

dokladnosc


4. Chipbreaker and clamping type

ksztalt pow natarcia


5. Edge length

length c length d length r length s length t length v length w l, d
mm cale
S4 04 03 03 06 - - 3,97 5.32
04 05 04 04 08 08 S3 4,76 3/16
05 06 05 05 09 09 03 5,56 7/32
- - 06 - - - - 6,00 .236
06 07 06 06 11 11 04 6,35 1/4
08 09 07 07 13 13 05 7,94 5/16
- - 08 - - - - 8,00 .315
09 11 09 09 16 16 06 9,52 3/8
- - 10 - - - - 10,00 .394
11 13 11 11 19 19 07 11,11 7/16
- - 12 - - - - 12,00 .472
12 15 12 12 22 22 08 12,70 1/2
14 17 14 14 24 24 09 14,29 9/16
16 19 15 15 27 27 10 15,88 5/8
- - 16 - - - - 16,00 .630
17 21 17 17 30 30 11 17,46 11/16
19 23 19 19 33 33 13 19,05 3/4
- - 20 - - - - 20,00 .787
22 27 22 22 38 38 15 22,22 7/8
- - 25 - - - - 25,00 .984
25 31 25 25 44 44 17 25,40 1
32 38 31 31 54 54 21 31,75 1 1/4
- - 32 - - - - 32,00 1.260

6. Insert thickness

Symbol Thickness [mm]
01 1,59
T1 1,98
02 2,38
03 3,18
T3 3,97
04 4,76
06 6,35
07 7,94
08 8,00
09 9,52
12 12,70

7. Corner radius / Finishing edge

Symbol Corner radius r
02 0,2
04 0,4
08 0,8
12 1,2
16 1,6
20 2,0
24 2,4
32 3,2
Symbol Insert's clearance angle ?r Symbol Finishing edge's normal clearance angle ?n
A 45° A
D 60° B
E 75° C
F 85° D 15°
P 90° E 20°
Z other angle F 25°
    G 30°
    N
    P 11°
    Z other angle

8. Cutting edge condition

krawedz en


9. Cutting direction

kierunek


Basic Cutting Conditions for milling

Material group Group number Brinell hardness
[HB]
Coolant Feed per tooth
[mm/tooth]
Vc [m/min]
45° 90°
Low carbon steel 1 150 No 0,30 0,22 300
180 270
210 230
Alloy steel 2 180 No 0,25 0,18 230
230 190
280 170
320 150
High alloy steel 3 220 Yes / No 0,22 0,15 150
280 110
320 100
350 70
Austenitic stainless steel
4 210 - 250 No 0,27 0,18 230
5 230 - 270 Yes / No 0,25 0,15 210
6 - Yes 0,23 0,12 90
Ferritic stainless steel
7 annealed No 0,25 0,15 210
Martensitic stainless steel
8 annealed No 0,25 0,15 210
treated 130
Grey cast iron 9 140 - 250 Yes 0,30 0,18 250
230
190
Nodular cast iron 10 210 Yes 0,25 0,15 190
260 150
310 130
Nickel based alloys
11 - Yes 0,23 0,15 32
32
55
Titanium based alloys
12 - Yes 0,23 0,15 48
38
Aluminium (Si < 8%) 13 - Yes 0,25 0,15 800
- 0,18 0,12 450
 

For Alu group 13 please use Aluline grade PL 05

Aluminium (Si > 8%) 14 - Yes 0,25 0,15 250
 

For Alu group 14 please use Aluline grade PL 10

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