SCARFING INSERT_SNMX 19-R

General information

• Designation: S = square insert shape, N = 0° clearance, M = tolerance class, X = special design, 19 = insert size, R00 = profile radius (straight edge), T9335 = grade.
• Grade T9335 is intended for the P (steel), M (stainless steel) and S (super alloys) material groups at medium cutting speeds, in continuous and heavily interrupted cuts.
• Coolant has a positive effect on tool life; cooling is recommended.
• Compatible holders: PXFNR/L 2525 S 19 and PXFNR/L 2525 S 19/15 (version with 15° inclined head), shank 25 x 25 mm.
• Spare parts for these holders (Dormer Pramet set PX50): shim SNU 190410-R, PU 05, US 38, NT 06, MT 06 and HXK 5.
• R00 has no working radius, so no tube diameter range applies. For round tubes, use the SNMX 19-R radius version that matches the tube outside diameter.

Cautions

• Clean the insert seat and clamp the insert firmly before use. Stable clamping prevents vibration and edge chipping.
• Set the cutting edge accurately to the weld seam so the bead is removed flush without cutting into the tube wall.
• Scarfing chips are hot and sharp. Wear safety glasses and gloves when handling chips and inserts.

The SNMX 19-R series is Dormer Pramet's double-sided, negative square insert for external scarfing, which means removing the outside weld bead that forms when metal strip is welded into tube or pipe on a tube mill. SNMX 19-R00:T9335 is the straight-edge version (profile radius R00). The other versions have a cutting edge curved to follow a round tube. This one has straight cutting edges, which makes it the choice for deburring the outside of square and rectangular steel, stainless-steel and super-alloy tubes.

Key features

• Square, negative insert (0° clearance) with a 19.05 mm main cutting edge, 19.05 mm inscribed circle, 8.15 mm thickness and a 7.95 mm fixing hole.
• Double-sided design: both faces of the insert can be used, giving more cutting edges per insert.
• Grade T9335: MT-CVD coated, functionally graded WC-Co carbide covering ISO P20-P45, M15-M40 and S15-S25.
• Tough coated carbide made to withstand the high temperatures of scarfing, with excellent resistance to heat and chipping for long edge life.
• Precise cutting edges give a high-quality surface on the scarfed seam.
• Stable clamping in PXFN(RL) holders prevents insert vibration.

Typical applications

• External scarfing (outside weld bead removal) on welded square and rectangular tubes.
• Steel, stainless-steel and super-alloy tubes.
• Continuous and heavily interrupted cuts, including very unfavourable machining conditions.

SNMX 19-R00 is a square (90°) indexable insert with 0° clearance on all sides (negative), so both the top and bottom faces can be used for cutting. A fixing hole runs through the centre of the insert.

• L, main cutting edge length: 19.05 mm
• IC, inscribed circle diameter: 19.05 mm
• S, insert thickness: 8.15 mm
• D1, fixing hole diameter: 7.95 mm
• PFRAD, profile radius of the main cutting edge: R00 (straight cutting edge, no working radius)

On the radius versions of the SNMX 19-R series the main cutting edge is curved to a working radius (PFRAD) that matches the tube diameter. On R00 this edge is straight.

How to choose an SNMX 19-R insert

Choose the profile radius (PFRAD) by tube shape and outside diameter. R00 has straight cutting edges for square and rectangular tubes, and the radius versions are for round tubes and pipes. The values below come from the Dormer Pramet catalogue for grade T9335:

• Many radius versions are also available in grade 6640 for steel and stainless-steel tubes. R00 is supplied in T9335.
• Straight-edge R00 inserts also exist in other sizes: SNMX 15-R00 and SNMX 25-R00.