Roughing mold cavities

[Programinator]

I need info for what type of endmills to use to rough out small mold cavities. Like say i needed a 3/8 cutter. What i have been using is the regular zcarb endmills from sgs. Im cutting P20.

 

Any suggestions?

[[email protected]]

I use Fraisa....really like em

 

www.fraisausa.com

[Programinator]

quote:

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I use Fraisa....really like em

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Any certain ones that you seem to like. That catalog is huge.

[[email protected]]

For roughing H-13 I use the U5956.530 Its a .5 w/.09 Rad.

I use them for HST Restmill to follow a 2" Iscar Feedmill.

 

Edit: I use a holepopper and put a 1mm hole thru the center of the EM for coolant thru. It makes it last longer getting the chips outta the way

 

 

I use the .25 (U5956.312) also to rough out a fin section on some head dies we do.

 

They hold up very good

 

HTH

[Ocean Lacky™]

Ok....now I'm curious. What kind of molds?

 

I do a lot of forging dies, and absolutely NEVER use end mills for roughing cavities. Always use ball cutters. 10% DOC with 6-12k RPM and 100-170 IPM Feeds.

 

What kind of feeds and speeds do you use? Just wondering if maybe I should/could be doing it better.

[Leigh @ Kodiak]

If I was doing the sort of work you guys are speaking of, I would want to give these a try from Iscar.

[Millertime]

I agree with ocean lacky i cut alot of hard s-7 around 56 rc. i will z level rough a small cavity with a 6mm 2flute seco ball endmill at about 10,600 rpm .070 step over and a .023 depth of cut they also make a 2fl hi feed end mill wich works good.

[Millertime]

almost forgot 95 ipm woops

[Redfire427]

Call up your local Millstar rep and I'm sure they will hook you up with a sample. We use their 3/8 4-flute solid carbide feedmills in P20 or even hardened H13. How fast you go will be based on your machine dynamics, not the tool. I can run 7000rpm and 350 ipm on P20 with our Makino's and it cuts ( and lasts ) like a dream. Solid carbide feedmills have come a long way in the last couple of years. HST toolpath with a feedmill is fun to watch on the right equipment.

[Ocean Lacky™]

Dapra makes some nice tools, too. I have a 3/4 inserted ball nose that I use for probably 90% of my initial rough cuts. 6000rpm, .075 doc, and 45% step-over @ 150 ipm is pretty impressive. I usually bump it up to 8,000 rpm and 150 ipm for finish cuts in non critical areas. Makes for a nice finish! Usually, I go right to a 1/4" 2 fluted ball for a rest roughing pass and depending on the particular part, finish with the 1/4 or 1/8. @ 12000 rpm and 100 ipm.

[Millertime]

Having a problem verifying a slot mill with a full rad.the program is a surface finish contour and the tool is cuting a -6 deg angled wall.Every time I verify i get some red at the top of the draft.

[Odin]

Look into GARR die sinkers- www.garrtool.com/pdf/catalog_09.pdf Page 111...we use diameters .031" to .500" , from engraving to profiling roughing amd finishing of hardened h-13 on a makino mcb 1210 machining center and a makino s56 vert mill. Also look into the Iscar Multi-Master tooling. they have interchangebale tips with carbide shanks...