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TNMG 220412 AS A MORE ECONOMICAL ALTERNATIVE to CNMG 160612

16.11.2020

Widely used for rough turning, the CNMG160612 insert has 4 cutting edges, while the TNMG220412 has 6 edges. At the same time, the cost of machining with a triangular insert is lower than that of a rhombic one, due to the lower consumption of hard alloy, and, as a consequence, the lower cost of the cutting edge.

High performance carbide tool Mikron Tool. Micro drills, flexible drills and much more from the first supplier in Belarus - Iron Park LLC

As an example, you can calculate the cost of one cutting edge using the example of an insert manufactured by SECO TOOLS (Sweden).

Name CNMG160612 MR7,TP3501 TNMG220412-MR7,TP3501
Number of cutting edges 4 6
Plate cost, EUR 12,5 9,65
Cutting edge cost, EUR 3,13 1,61

* Prices for reference, current as of 11.2020

With simple calculations, you can see that the cutting edge cost of the TNMG220412 insert is 51% lower than that of the CNMG160612.

Consider roughing with the above inserts. Billet - circle Ø220, steel 45 as delivered.

Recommended modes for each of the plates are shown below.

CNMG160612-MR7 TP3501

High performance carbide tool Mikron Tool. Micro drills, flexible drills and much more from the first supplier in Belarus - Iron Park LLC

660.0

4,00

200

1

0,48

260

Material

Processing method

Other

Select material

Tensile strength [520-1200 N / mm2]

Required feed / revolution [0.333-0.665]

Final diameter  [D2]

Required number of passes (ar) [1-3]

Required cutting speed [185-321]

Depth [S ap]

Low alloy structural steels, 0.25% <C <67% wt

Select material

Calculation of modes

Longitudinal external turning

TNMG220412-MR7 TP3501

High performance carbide tool Mikron Tool. Micro drills, flexible drills and much more from the first supplier in Belarus - Iron Park LLC

660.0

200

1

Material

Processing method

Other

Select material

Tensile strength [520-1200 N / mm2]

Required feed / revolution [0,308-0,615]

Final diameter [D2]

Required number of passes (ar) [1-2]

Required cutting speed [202-349]

Depth [S ap]

Low alloy structural steels, 0.25% <C <67% wt

Select material

Calculation of modes

0,44

285,0

3,0

Longitudinal external turning

As you can see from the above modes, the recommended feed, speed and depth of cut differ for inserts. Let's calculate the productivity (chip removal rate) for each of the inserts.

Specific metal removal (cm3 / min):

Q = V×f×ap => CNMG160612: Q = 260×0,48×4 = 499 см3/мин

TNMG220412: Q = 285×0,44×3 = 376 см3/мин

It can be seen from the calculations that the productivity of the CNMG160612 insert is 33% higher, but the cost of the cutting edge is also 51% higher.

Summing up on the given example, we can see that optimization of processing with removable inserts is possible in two directions: optimization according to the criterion of the highest productivity and according to the criterion of the lowest costs. In the case of using an expensive tool, its price begins to have an increased effect on the cost of machining a part, which causes an obvious need to minimize tool costs. One of the ways to reduce these costs is to minimize the cost of the cutting edge of the insert while maintaining a consistently high quality of processing.

Technological engineer of Iron Park LLC

Orlovsky A.L.

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