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MRTの技術

Cutting conditions

Cutting condition

First, please enter the specs which you are using, the number of rotations, etc. and calculate the speed of cutting. After that, please compare it with the standards which MRT recommends(please refer to the following chart)

※The speed which MRT recommends is just a standard. It varies from the type of work materials and the performance of the machines. If you would like further informationt in detail, please contact our technical staff.

Please confirm the work material or cutting materials, and try to compare to the table below.

◆Cutting speed V(m/mim)
Work MaterialCutting materials
Common materialHigh speed steelCarbide
Iron steelCarbon steelSuper soft steelS10C30~6060~130
Soft steelS30C40~6080~130
Semi-hard steelS40C35~5570~110
Hard steelS50C30~5060~100
Hardest steelSK525~4050~80
Free cutting steelLead  Free cutting steelAdditional code “L”45~70100~150
Sulfur  Free cutting steelAdditional code
“S” or “SUM”
50~80110~170
Stainless steelFerritic StainlessSUS43030~6560~130
Martensitic StainlessSUS420J220~5550~120
Austenitic StainlessSUS30415~5040~110
Special steelHigh manganese steelSCMnH215~1515~30
High speed steelSKH5115~3035~60
Tool steelSK220~3060~90
Alloy steelSCM43035~5070~110
Cast materialsChilled cast iron 5~15
Alloy cast iron 5~1515~35
Spheroidal graphite cast ironFCD5015~3535~60
Standard cast ironFC2020~5045~100
Malleable cast ironFCMB3220~3040~70
Cast steelSC4625~4050~80
Non-ferrous metalsCopper alloyCopperC110040~10080~250
BronzeBC270~100150~250
BrassC2600100~250200~350
Light alloySilicon aluminum alloyAC325~4050~80
Aluminum alloyA2017120~200250~400
AluminumA1100S150~400300~500
Magnesium alloyMP1200~600400~1200
 TitaniumTR3510~3020~60
Cobalt and Nickel alloyStellite 7~15
Hastelloy X 10~20
Inconel X 15~30
NickelNNCP-010~25
Non-metals Thermosetting plastic 80~130180~250
Thermoplastic 150~220300~450
◆Feed per tooth Sz(mm/tooth)

 

High speed steel screw slotting cutter0.01mm~0.04mm
Solid carbide metal slitting saw0.005mm~0.02mm

Sz=Vf/Z・N

Vf:Feed speed(mm/min)
Z:Number of teeth
N:Cutting rotation per minute(r.p.m.)

Troubleshooting for cutting use

◆Deciding the cutting speed
Maintain low speed when....
  • durability of the cutter is required
  • the work material is hard, or it is coated with surfaces resistant to wear
  • the processing is in a primary stage (coarse cutting)
  • the process is new or still unfamiliar for you
  • the wear and the damage of cutting edge are rapid
Maintain high speed when....
  • the work material is relatively easy to be cut
  • finishing process which requires high precision and accuracy
◆Choosing the feed per tooth
Decrease the feed when....
  • the work material can only be set up in an unstable position, or you are handling a thin and irregularly-shaped material
  • the work material must be cut by a thin, fragile cutter
  • the machined surface must be high level accuracy of roughness
  • chipping occurs more than minimum feed condition
  • you are slotting a deep groove
Increase the feed when....
  • the work material set up firmly, heavy duty cutting
  • the work material is relatively easy to be cut, or it is hard only on the surface, and the inside is relatively soft
  • the work material surface has intermittence shape
  • relief angle of the cutter wears rapidly
  • the machinery vibration occurs at cutting process

If you must change the machine set up from the testing stage, please experiment with the cutting speed, feed, depth, independently to find out what causes right / wrong results.

Even if the combination is proven right during the testing stage, it is advisable to gradually increase the limit to reach the highest efficiency possible. Then, adjust the limit to meet the safety guidelines for the best result.

Please reinforce with fix ture equipment if necessary.

MRTの技術 -technology-