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Description
TPKN 2204 milling insert – 90° triangle without a hole
| Technical data | |
|---|---|
| Shape | Triangle (T) |
| Side length l | 22.0 mm |
| Insert thickness s | 4.76 mm |
| Inscribed circle diameter IC | 12.7 mm |
| Entering angle κ | 90° |
| Carbide grade | H8320 (Horn) |
| Hand | right-hand (R) |
| ANSI code | TPK 43 |
TPKN indexable insert for milling steel and stainless steel
conservative ranges for ISO P and M groups — 90° shoulder milling
| Material | Vc [m/min] | Feed per tooth fz [mm/tooth] | Depth ap [mm] |
|---|---|---|---|
| PSteel | 130-200 | 0.10-0.20 | 1.0-4.0 |
| MStainless steel | 70-130 | 0.06-0.15 | 0.5-2.0 |
H8320 cemented carbide insert – design and applications
clamp-on without a hole for 90° milling heads and indexable milling cutters
The TPKN 2204 PPR H8320 milling insert is a triangular, single-sided cemented carbide indexable insert designed for milling steel and stainless steel. Positive geometry with an eleven° clearance angle and the absence of a hole and chip breaker are features of the TPKN family, secured with a top clamp (clamp-on). The triangular shape provides three cutting edges on one side of the insert. The PPR suffix encodes a ninety° entering angle, a wiper chamfer at the corner and a right-hand version. Grade H8320 from Horn is selected for materials that are more difficult to machine. The carbide is supplied by the Korean brand Horn. The wiper chamfer at the corner smooths the floor of the milled surface and allows higher feed rates without sacrificing surface finish.
Key benefits of the TPKN 2204 milling insert
- Three cutting edges — the triangle uses 3 corners on one side; when an edge is worn, index the insert in the milling head pocket.
- 90° entering angle — the insert face mills the surface while simultaneously milling a perpendicular shoulder, a typical shoulder milling operation.
- Wiper land at the corner — the wiper edge improves the floor and wall finish during face milling at higher feed rates.
- The absence of a hole and chip breaker simplifies the pocket; the top clamp securely locates the insert in the 90° milling head.
- Dimensions according to GOST 27302-87: side 22 mm, IC 12.7 mm, thickness 4.76 mm — fit TPKN 2204 pockets.
- Grade H8320 from Horn handles more demanding materials than general-purpose carbide for steel and stainless steel.
Applications and milling data selection
The TPKN 2204 milling insert operates in milling heads and indexable milling cutters with a ninety° entering angle, face milling surfaces and machining perpendicular shoulders in steel and stainless steel. Calculate the spindle speed using n = 1000·Vc/(π·D). For a milling head with a diameter of 63 mm at a cutting speed of 150 m/min, the result is approximately 758 rpm. With five inserts and a feed of 0.12 mm per tooth, the table feed rate is vf = fz·z·n, or approximately 455 mm/min — a practical starting point for fine-tuning.
The wiper chamfer at the corner improves surface quality, but keep the feed per revolution below sixty percent of its width to limit burr formation. For stainless steel, reduce the cutting speed to 70–130 m/min and maintain a constant feed, as austenitic steel conducts heat poorly and work-hardens. Select the depth of cut according to system rigidity and machine power, and index the insert before excessive corner wear occurs. Climb milling extends cutting edge life and reduces surface roughness, so it is preferred on CNC machines with table backlash eliminated.
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Application limitation
Inserts TPKN have no chip breaker — chip formation depends on the cutting parameters and coolant. For ductile stainless steel, select the feed and coolant to ensure chip breaking, and do not exceed the cutting speeds recommended for grade H8320.
Triangular insert designation decoder according to ISO 1832
how to read the TPKN 2204 PPR code — designation positions 1–9
Designation TPKN 2204 PPR according to the standard ISO 1832: 4 letters describe the geometry and construction, 2 numeric codes describe the dimensions, and the suffix PPR — the wiper edge geometry. Each field has a number, an icon and a brief description.
ISO 1832 designation decoder — how to read the code
1Tshape 2Pangle α 3Ktolerance 4Ntype – 522size 604thickness – 7Pangle κ 8Pland α′ 9Rhand
Positions 1–3 · ISO code
1TShape
60° triangle
3 corners of 60° per side
2PClearance angle
α = 11°
positive, single-sided
3KTolerance
Class K (precision)
ground thickness ±0.025 mm
Positions 4–6
4NType
Without hole or chip breaker
clamp or wedge mounting
522Size
l = 22 mm
IC = 12.7 mm · 1/2″
604Thickness
s = 4.76 mm
between rake faces
PPR suffix · wiper edge
7PEntering angle
κ = 90°
90° angle milling cutters and milling heads
8PWiper land
α′ = 11°
wiper land clearance angle
9RHand
Right-hand
standard clockwise spindle rotation
✓ 3 corners × 1 side = 3 cutting edges
Full designation: TPKN 2204 PPR = triangle 60° · positive 11° · class K · without hole or chip breaker · IC 12.7 mm (l 22 mm) · s 4.76 mm · κ 90° · wiper land 11° · right-hand (R)
Milling heads and indexable milling cutters for the TPKN 2204 insert
90° pocket — face milling and shoulder milling
| Milling head / indexable milling cutter | Entering angle | Compatible |
|---|---|---|
| Dolfamex 220.17 (Ø40–200 mm) | 90° | ✔ |
| Darmet FA90TP22 | 90° | ✔ |
| YG-1 F90-TPKN22 | 90° | ✔ |
| MBC EM90 | 90° | ✔ |
| Milling heads for inserts SPKN | 75° | ✗ |
| Milling heads for inserts SEKN / SEAN | 45° | ✗ |
Frequently asked questions about the TPKN 2204 insert
geometry, designation and milling head selection
Three — the triangular insert has 3 corners, and its single-sided, positive design means that only the top side is used. When a corner is worn, index the insert in the milling head pocket to the next edge without replacing the tool.
Three subpositions: the first P is the entering angle κ 90°, the second P is the wiper chamfer clearance 11°, a R indicates the right-hand version. The insert remains without a hole or chip breaker.
Milling heads and indexable milling cutters with an entering angle of 90° — for example, Dolfamex 220.17 (Ø40–200 mm), Darmet FA90TP22, YG-1 F90-TPKN22 or MBC EM90. It does not fit 75° milling heads (for SPKN inserts) or 45° heads (for SEKN).
Yes — grade H8320 covers group ISO M. Maintain a cutting speed of 70–130 m/min, constant feed and coolant: austenitic steel conducts heat poorly and work-hardens when cutting too slowly.
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