Gold is the metal: Turning Performance

CTE Editor Alan Richter covers a unique insert clamping mechanism and seating configuration in his April 2011 Look Ahead column.

April 15, 2011By Alan Richter

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Increasing the material-removal rate to reduce cycle time using lower horsepower while imparting the specified surface finish is the goal when turning. To achieve that, Ingersoll Cutting Tools introduced the Gold-Duty family of CNMX and SNMX double-sided turning inserts.

The aggressive HB chipbreaker on the inserts lowers cutting forces and therefore lowers a machine’s horsepower requirement, the company reports. The chipbreaker also provides finer finishes when medium to rough turning compared to equivalent CNMG and SNMG inserts. The toolmaker says the new inserts offer performance comparable to single-sided CNMM and SNMM inserts, but with the double-sided economy advantage.

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Courtesy of Ingersoll Cutting Tools

Ingersoll’s new Gold-Duty double-sided insert for medium to rough turning is securely clamped with the toolmaker’s hook lever (bottom).

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Heavy Lifting Use the power of CUTTING TOOL ENGINEERING to reach your customers When it comes to delivering manufacturers who cut or grind metal, CTE is a heavyweight: month (AWStats). 99% of CTE subscribers perform metalworking operations (Readex Research, 2010). 96% of CTE subscribers are involved in purchasing/selecting.

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For example, when test cutting a 4.0 ” length of 25 “-long, 0.45 percent carbon steel at 500 sfm, 0.040 ipr and a 0.200 ” DOC, Ingersoll’s CNMX 553 HB insert imparted a 8.8µm Ra finish compared to 9.0µm Ra for a competitor’s double-sided CNMG 543 insert and 9.7µm Ra for a competitor’s single-sided CNMM 543 insert.

Instead of having a flat bottom to maximize seating rigidity, Gold-Duty inserts have four resting pads on their concave sides that enable even a used side to be raised above the convex mating seat yet stably contact it, explained Ed Woksa, marketing manager for turning and holemaking products. That further lowers cutting forces and enhances chip flow at the recommended DOC from 0.060 ” to 0.315 “.

Woksa added that a hook lever clamping system enhances seating rigidity in the insert’s new H-type holder by exerting a double-clamping force. In contrast, a conventional lever design on a P-type holder pushes the insert in one direction back into the two seating walls. “We’re getting multidirectional clamping force,” he said. “That’s going to be 30 percent stronger than the typical lever lock.”

According to the company, the hook lever clamping system eliminates the need for top clamps, which often wear out because of chip wash.

For more information, contact Ingersoll Cutting Tools, Rockford, Ill., by calling (815) 387-6600 or visiting www.ingersoll-imc.com.

Glossary terms in this article

chipbreaker
Groove or other tool geometry that breaks chips into small fragments as they come off the workpiece. Designed to prevent chips from becoming so long that they are difficult to cont…