Manganese steel machining

[GV]

Hi!

Does any of you have experience machining this type of steel? Is ASTM A128 grade A cast manganese steel, work hardens. I'm eating inserts like no tomorrow.

Any input will help.

[mkd]

Some fundamental strategies will certainly help, almost, regardless of material.

give us the parameters you are using now and some experts will chime in with helpful ideas.

 

axial depth of cut=

radial step over=

cutter dia=

rpm=

feed=

make and model of machine=

[GV]

Thanks MKD for your reply!

It is a face milling operation,removing .180 stock

I'm using a Sandvik Coromill 300 2 1/2" face mill (1.850 center of inserts) with 16mm round inserts grade 2040

Machining in 3 passes, .07, .06 and .05 depth of cut.

Using dynamic toolpath, climb, 66% stepover (1.220")

360 rpm

8 ipm

The machine is Fadal HS 4020

[mkd]

well the number one idea would be to reduce stepovers dramatically; under 30% of cutter dia. This will allow taking advantage of Radial Chip Thinning Factor and reduce heat build up. this in turn will allow more feed and more RPM.

i would want to run that cutter at 1000rpm and 30Ipm to start. the idea is to adjust depth of cuts to suit the RPM and feed. not visa-verse.

get rid of the depth passes as much as possible; they are killing you. should be able to take .180" in one whack, no problem.

 

i have run 1/2 carbide endmills at 100 ipm, with .02-.03" stepover, 1.0" z depth, in p-20 tool steel (mildly pre-hardened) on Fadals. high spindle load, very little sound! one cutter lasts all day with chips hitting the enclosures. NO B.S.

 

RUN DRY!!!!!!!!!!!!