I'm using a CNC swiss type lathe. We are trying to machine bar 1/8 SST304, but we have problems with tool wear and chip control, we are using a SECO DCMT 070204 F1 CP500, the cutting conditions are RPM 8000, F=0.04 mm/rev DOC=0.8 mm. Got any tips to improve the process?
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Machining SST304
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Posted 7 months ago #
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That's a pretty small I.C. insert. There aren't many choices of insert in that size, but one that I know will impress you with tool life in 304SS. Get a Valenite DCGT070204 1L (a.k.a. DCGT21.51 1L) in grade VP9605. EDP number is 19082. They have a smaller radius one also, a DCGT070202 1L VP9605 EDP# 19081. If you can go to a smaller tool nose radius, that will further reduce cutting force, something important on such small diameter stock.
Two things about that insert will help over the current one. First, it's a ground periphery on the insert for a sharper edge. This reduces cutting forces and lessens the risk of work-hardening. The coating is extra-hard and the substrate carbide is sub-micron size, this will help with tool life.
Posted 6 months ago # -
This may not apply to the insert, but when rotary broaching SS many of our customers upgrade to tougher materials and coatings for wear, but for chipping we recommend they try slowing down a little bit first. This often solves the problem.
Posted 6 months ago #
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