The first wiper edge was pioneered by Sandvik Coromant in 1997. Now, we have taken another step with the new WMX geometry, the first true all-round solution to maximize productivity in turning, with a feed rate capability that is considerably higher than with existing wipers. This means cutting times are reduced by around 30% – with improved component quality.
Wiper radius, same feed rate.
Wiper radius, two times the feed rate.
Performance of wiper inserts
Wiper inserts are capable of turning at high feed rates -
without losing the capability for generating good surface
finishes or chip breaking ability.
Wiper inserts are used primarily for longitudinal and face turning
Designed to smooth the surface generated as the insert is fed along a workpiece, the wiper effect is primarily designed for straight-line turning and facing.
Wiper geometry selection
-WMX is the first choice wiper, and is a good starting point for most applications, but there is always a productive alternative when conditions change.
Move to a positive wiper geometry to lower forces and maintain productivity in case of vibration problems.
-WL: for improved chip control when moving to a lower fn/ap.
-WF: improves chip control at a lower fn/ap. Also for lower cutting forces when vibrations occur.
-WMX: always the first choice within the wide chip application area. Provides
maximum productivity, versatility and the best results.
when a stronger edge line is needed, e.g. for interrupted cuts.
Modified nose radius
The modified nose radius is within the tolerances for C- and W-style inserts as specified by ISO standards and therefore does not give rise to any programming complications. The corner has been given a new carefully developed shape rather than just one straightforward radius. This has a profound effect on the surface generated as the ridges, normally left behind as the insert moves on, are ”wiped” off by the extended cutting edge.
T-Max® P Wiper inserts
Are optimised for tool holders with 93° entering angle. Can also be applied in tool holders that have entering angle in the range of 92°–94°.
Works with tool holders that have entering angle in the range of 91°–93°.
The DNMX/TNMX Wiper insert has a corner configuration that deviates from a conventional DNMG/TNMG insert, which means that on some operations it has an effect on workpiece dimensions.
There is no Wiper-effect when making chamfers with Wiper C- and W-style inserts.
Negative basic shaped P-style inserts with a 100-degree corner have been provided with Wiper-effect.
Thanks to increased feed rate the chip breaking is normally improved with Wiper inserts.
CNMG wiper inserts
T-Max P negative basic-shaped CNMG 80° rhombic inserts also have a wiper effect on the 100° corner.
Thanks to increased feed rate, the chip breaking is normally improved with wiper inserts.
CoroTurn® 107 Wiper inserts
Are optimized for toolholders with 93° entering angle. Can also be applied in toolholders that have entering angle in the range of 92°–94°.
Works with toolholders that have entering angle in the range of 91°–93°.
The DCMX/TCMX Wiper insert has a corner configuration that deviates from a conventional DCMT/TCMT insert, which means that on some operations it has an effect on workpiece dimensions.
CoroTurn® 107 knife edge wiper inserts
Triangular inserts T06 and T09 with wiper geometry -WK are optimized for tool holders with a 91° entering angle. They can also be applied in tool holders that have entering angles in the range of 90°–92°.
The triangular T11 insert works with tool holders that have entering angles in the range of 91°–93°.
The TCGX wiper insert has a corner configuration that deviates from a conventional TCGT insert, which means that in some operations it affects workpiece dimensions.
Effect on workpiece dimensions
Effect on the workpiece when using TCGX inserts and methods for compensating to achieve the correct dimension.
Wiper in ceramic and CBN
T - Negative land
S - Negative land and ER treated cutting edge
The ceramic and CBN wiper inserts have their cutting edges prepared for their particular application ranges: the ceramic inserts have edge preparations type T01020, T02520 and S01525. CBN inserts have T01030 and S01030.
T = negative land
010 = chamfer 0.10 mm
20 = chamfer angle 20°.
Effect on workpiece dimensions
bs = length of wiper radius
Effect on the workpiece when using DNMX or TNMX inserts and methods for compensating to achieve the correct dimension.
Edgecam provides CNC programming support for wiper nose radius compensation. For more information, see www.edgecam.com.
Comparison of standard inserts versus wiper inserts
The tables show the differences in radii between a standard insert and a wiper insert at different feed rates. Match the nose radius size with feed.
All values for standard radii are theoretical, and based on the use of a CNMG insert for radii re, 0.4, 08, 1.2 and DNMX for re 1.6 mm. Values obtained by other styles of inserts or systems, and workpiece materials may vary.
Ra values for wiper radii are based on experimental values in low alloy steel. Values may vary based on material condition and set-up rigidity.
1) Values for 1.6 mm radius are based on a DNMX insert.
General rules on achieving surface finish with wiper inserts
- The surface finish can often be improved by using a higher cutting speed.
- The insert geometry (neutral, positive and negative rake angles as well as positive clearance angles) influences the surface finish.
- The selection of insert grade has only a minor influence on surface finish.
- In the event of vibration tendencies, select a smaller nose radius.