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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)

 

 

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