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.
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).
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.
Related Glossary Terms
- Brinell hardness number ( HB)
Brinell hardness number ( HB)
Number related to the applied load (usually, 500 kgf and 3,000 kgf) and to the surface area of the permanent impression made by a 10mm ball indenter. The Brinell hardness number is a calculated value of the applied load (kgf) divided by the surface area of the indentation (mm2). Therefore, the unit of measure of a Brinell hardness number is kgf/mm2, but it is always omitted.
- chipbreaker
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 control, catch in turning parts and cause safety problems.
- flat ( screw flat)
flat ( screw flat)
Flat surface machined into the shank of a cutting tool for enhanced holding of the tool.
- turning
turning
Workpiece is held in a chuck, mounted on a face plate or secured between centers and rotated while a cutting tool, normally a single-point tool, is fed into it along its periphery or across its end or face. Takes the form of straight turning (cutting along the periphery of the workpiece); taper turning (creating a taper); step turning (turning different-size diameters on the same work); chamfering (beveling an edge or shoulder); facing (cutting on an end); turning threads (usually external but can be internal); roughing (high-volume metal removal); and finishing (final light cuts). Performed on lathes, turning centers, chucking machines, automatic screw machines and similar machines.
Author
Alan holds a bachelor’s degree in journalism from Southern Illinois University Carbondale. Including his 20 years at CTE, Alan has more than 30 years of trade journalism experience.
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