The Sandvik Coromant TNMX GC2015 indexable turning insert with a choice of WM, WMX or WF chipbreaker style has a triangle shape with a 60-degree cutting angle, providing wear resistance without limiting shock resistance for medium machining to finishing of stainless steel in average to good machining conditions. This double-sided negative insert has a chip groove on both sides, a hole in the center and six cutting edges. It has strong edges, zero clearance, and is a better choice for external turning than a positive insert. GC2015 grade is a combination of carbide and a coating of titanium carbonitride (TiCN), aluminum oxide (Al2O3), and titanium nitride (TiN) applied through medium temperature chemical vapor deposition (MTCVD), which provides hardness for wear resistance without limiting shock resistance. This grade is capable of handling high temperatures, making it a good choice for continuous cuts at moderate to high cutting speeds. MTCVD coatings are deposited at lower temperatures than CVD coatings. The lower temperatures reduce cracks in the coating and provide increased toughness and smoothness without limiting wear resistance. The coating also provides shock resistance during interrupted cuts.
The TNMX GC2015 is available with a choice of three chipbreakers: WM, WMX, or WF, for a range of cutting depths and feed rates. Wiper chipbreakers are designed for high-feed machining as well as operations requiring a high-quality finish. When reduced production time is a priority, inserts with wiper chipbreakers can be used at double the feed rate for the same finish quality as other inserts. When surface finish is a priority, they can be used at standard feed rates to achieve improved finish quality compared to other inserts. Wiper inserts can also reduce many grinding operations, resulting in improved component quality and roundness. The WMX chipbreaker has the highest range of cutting depths and feed rates, and can be used at up to triple the feed rates used by conventional finishing geometries. It also produces a higher quality finish than the WF or WM chipbreaker. The WF chipbreaker has the lowest range of cutting depths and feed rates. The WM chipbreaker is designed for medium-machining cutting depths and feed rates.
Tolerance of the distance from the base to the tip of the triangle is + or - 0.002” to 0.005”. Tolerance of the theoretical diameter of the insert is + or - 0.002” to 0.005”. Insert thickness tolerance is + or - 0.005”. Different insert shapes and sizes may have different inscribed circle (iC) measurements, which are related to the insert’s range of cutting depths, speeds, lead angle, and feed rates. The inscribed circle is the largest circle that can be drawn within the edges of the insert shape. In general, as the insert size and iC become larger, the maximum cutting depth increases. The cutting depth influences the metal removal rate, number of cuts, chip evacuation, and power required when using the insert.
Indexable inserts are small cutting tools designed to remove material in external and internal cutting applications such as turning, milling, drilling, and grooving. They are held by an insert holder, have multiple cutting edges, and can be rotated when one edge wears down. Multiple inserts can be used to accomplish a variety of cuts in one operation. An insert is either positive or negative, which refers to the rake or clearance angle at which the insert removes material. Inserts are coded according to their specific cutting and application capability (e.g. VNMG 16 04 04-QM). Each part of the code represents details of the insert shape, nose angle, clearance, tolerance, size, geometry, grade, and chipbreaker style.
Sandvik Coromant manufactures tools for turning, milling, and drilling. The company, headquartered in Sweden, makes tools used throughout the metalworking field, including the automotive and aerospace, die and mold, and general engineering industries. Sandvik Coromant inserts meet International Organization for Standardization (ISO) and American National Standards Institute (ANSI) standards.
Matching Inserts to Holders
These inserts are part of the Sandvik Coromant TMax P Negative Insert family, which means they can be used with CoroTurn RC, a clamp-style insert holding system. This system is for use when stability and security are essential for productive turning of large components. The system is mostly used for external turning, from roughing to finishing, but also for internal turning.
