PVD Inserts Speed Machining for Hard-to-Cut Materials

Walter has launched a line of Tiger-tec Silver PVD-coated inserts for machining of stainless steel, high-temperature alloys (ISO-M and ISO-S) and other materials that are difficult to machine.

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Walter has launched a line of Tiger-tec Silver PVD-coated inserts for machining of stainless steel, high-temperature alloys (ISO-M and ISO-S) and other materials that are difficult to machine. These materials are said to be particularly challenging if low cutting force is required, such as for finish-turning small, delicate components or boring internal diameters.

The aluminum oxide coating is applied by physical vapor deposition (PVD) and is designed to protect the inserts from wear, particularly at high temperatures, as many ISO-M and ISO-S materials are poor thermal conductors. In addition to offering high-temperature-wear resistance, the coating promotes higher cutting speed capability, longer tool life and increased toughness. Special surface smoothing on the rake face reduces friction to keep heat generation in check, and the thinness of the PVD layer helps maintain sharp cutting edges, a prerequisite for a soft cutting action or low cutting forces.

Three new PVD grades are available—WSM10S, WSM20S and WSM30S—in three positive geometries: FM4 for finishing operations; MM4 for universal use, including both 7- and 11-degree positive rake; and RM4 for roughing operations.