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Description
TPUN 220408 turning insert – positive 60° triangle
| Technical data | |
|---|---|
| Side length l | 22 mm |
| Inscribed circle diameter IC | 12.7 mm |
| Insert thickness s | 4.76 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | TPUN 432 |
Cutting data for the TPUN 220408 insert for steel and stainless steel
finishing, semi-finishing and roughing — ISO P and M groups
| Material | Finishing | Semi-finishing | Roughing | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | |
| PSteel | 200-295 | 0.15 | 1.5 | 170-240 | 0.3 | 4.5 | 150-215 | 0.4 | 7 |
| MStainless steel | 110-230 | 0.15 | 1.5 | 70-175 | 0.3 | 4.5 | 50-135 | 0.4 | 7 |
Grade H6018 cemented carbide indexable insert – applications and construction
positive, single-sided 60° triangle without a hole or chip breaker
The TPUN 220408 turning insert is a positive, single-sided indexable insert made of grade H6018 cemented carbide, designed for turning steel, cast steel, and stainless steel. Shape T denotes an equilateral triangle with a 60° corner angle, providing easier access to the contour during longitudinal turning and facing. Positive geometry with a 11° clearance angle (letter P) reduces cutting resistance, so the insert cuts on one side and provides three cutting edges. The letter N in the designation indicates a design without a hole or chip breaker — the insert is secured with a top clamp.
The insert body is made of coated H6018 cemented carbide, which retains its hardness and resistance to abrasive wear at elevated cutting temperatures. This enables the tool to withstand varying dynamic loads and makes it suitable for cutting with large-cross-section discontinuous chips. The absence of a hole and the flat rake face increase insert rigidity in the pocket, which is important during rough stock removal. Top clamping requires a tool holder with a clamping arm instead of a center screw.
Key features of the H6018 cemented carbide insert
- Three cutting edges — the triangle has 3 corners, and the positive single-sided geometry uses one side of the insert; once a corner is worn, rotate the insert in its pocket.
- Grade H6018 for ISO groups P and M — coated carbide for steel, cast steel, and stainless steel, including large uncut chip cross sections.
- Corner radius rε 0.8 mm — a general-purpose version combining surface finish with edge strength at feeds of 0.15–0.4 mm/rev.
- Positive geometry with a 11° clearance angle reduces cutting forces and performs well at low and medium speeds.
- Dimensions according to ISO 1832: edge length 22 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — for tool holders with a 22 triangular pocket.
- Tolerance class U (wide) indicates standard corner position repeatability, typical of inserts secured with a top clamp.
Applications and parameter selection for the triangular insert
The TPUN 220408 insert (also written without a space as TPUN220408) is suitable for rough turning and semi-finishing of shafts, bushings, and forgings made of structural steels and cast steel, including interrupted cutting and varying uncut chip thickness. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 50 mm at Vc = 200 m/min, the result is approximately 1273 rpm. For stainless steel, maintain a cutting speed of 50–230 m/min and a constant feed to limit work hardening of the layer being cut. Roughing allows depths of cut ap up to 7 mm, which the insert can withstand thanks to its 4.76 mm thickness and rigid, single-sided body without a hole. Indexable inserts in grade H6018 are supplied by the Korean brand Horn, which is not part of the German company Paul Horn.
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Application limitation
Insert TPUN 220408 has no chip breaker — chip control depends entirely on the selected feed and cutting speed. For materials producing long, continuous chips, increase the feed or choose an insert with a shaped chip breaker.
Triangular insert designation decoder according to ISO 1832
how to read the TPUN 220408 code — designation positions 1–7
Designation TPUN 220408 according to the standard ISO 1832: 4 letters describe geometry and construction, 3 numeric codes describe dimensions. Each field has a number, an icon, and a brief description.
Frequently asked questions about the TPUN 220408 insert
number of edges, clamping, and selection of turning parameters
Three — the triangle has 3 corners, while the positive, single-sided geometry (letter P) allows only one side of the insert to be used. Once a corner becomes dull, simply rotate the insert in its pocket without changing the tool holder.
The letter N indicates a design without a hole or chip breaker. The insert is secured with a top clamp (clamping arm) in a tool holder with a 22 triangular pocket, rather than with a center screw through a hole. Chip control is achieved by selecting the feed and cutting speed.
Only in the nose radius rε: 0.4 mm is used for finishing at low feed rates, 0.8 mm is the general-purpose version, and 1.2 mm is selected for roughing at higher feed rates. The remaining dimensions (IC 12.7 mm, thickness 4.76 mm) are identical.
Yes — grade H6018 also covers the group ISO M (stainless steel). Maintain a cutting speed of 50–230 m/min, a constant feed, and continuous cooling: austenitic steel dissipates heat poorly and work-hardens when cutting is too slow.
Product accessories
Carbide insert TPUN 220404 H6310 Horn
Reference: 0000004235 In stock > 10 items
€6.84
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