WNT broaching system eliminates separate set-up time

Published : January 07, 2010

The recently introduced range includes solid carbide tools (type NPU), certain sizes of which are compatible with WNT’s existing Mini-Cut toolholders, and a range of indexable insert type tools (type NPV); with both being available to cut class C11 (DIN138), Class JS9 (DIN 6885) and Class P9 (DIN 6885) grooves. The tools are available in a variety of widths ranging from a nominal 4 mm through to 10 mm, with special widths available to order, using the straightforward order form in the WNT (UK) catalogue supplement.

The design of the clamping mechanism for the indexable NPV-type inserts is such that it overcomes one of the key issues with existing broaching systems, namely insert breakage. As a result cutting data can be increased and typically, when broaching a 42CrMo4 850N/mm2 steel, the feedrate will be 7200 mm/min at a depth of cut of 0.072mm.

The system is designed for use on lathes, machining centres and, in particular, sliding head lathes, where slots that would normally be produced on stand-alone machine tools can now be completed in a single set-up.

“In developing this series of broaching tools WNT has addressed many of the issues that were raised by users of this type of tool. They can now confidently produce slots and grooves to precise tolerances and by eliminating second operations the overall accuracy of components is improved,” says Adrian Fitts, Business Development Manager, WNT (UK).

By broaching as part of an existing machine cycle users can also provide a more cost-effective solution to their customers. For example, economical batch quantity for the process is now one-off, allowing work to be taken on that may previously have been turned down, due to the requirement of sub-contract broaching. And, with the interchangeability of the inserts and the rapid availability of special width inserts sub-contractors can react quickly to changes to their customers’ requirements.

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