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Home » Sandvik Coromant Introduces Collet for CoroChuck 930

Sandvik Coromant Introduces Collet for CoroChuck 930

December 2, 2019
Cutting tool and tooling system specialist Sandvik Coromant has introduced a new collet for its CoroChuck 930 high-precision hydraulic chuck. Designed to suit Weldon shanks, the new collet features a mechanical locking interface to prevent tool pull-out or movement when producing expensive components and/or machining with challenging cutting data. 

“Being 100% assured of zero pull-out for Weldon shanks when producing high value-added parts, such as aerospace frame and engine components, is paramount in the highly competitive manufacturing arena,” says Mats Backman, global product manager at Sandvik Coromant. “Production engineers and managers are under constant pressure to minimize scrap and maximize bottom-line profitability. These thoughts were the driver for developing the new collet.” 

The mechanical locking interface acts between the collet and chuck, and between the collet and shank. Having confidence in no pull-out when both collet and chuck are locked enables increased productivity in heavy-duty applications. Further benefits include easy assembly into CoroChuck 930 chucks, both slender and HD versions, while high run-out accuracy is assured with cylindrical clamping of Weldon shanks. In addition, coolant supply through the collet provides secure and reliable coolant delivery to the tool. 

Ultimately, this new solution will benefit any machine shop seeking trouble-free machining in heavy applications. No pull-out or tool movement protects against the potentially sizable cost of reworking or scrapping an expensive component. Pull-out effectively changes the gauge length of the tool mid-cut, leading to the generation of features with incorrect dimensions or crash marks.

To provide an example of the potential gains on offer, a customer case trial saw CoroChuck 930 (featuring the new collet) used for a milling operation on a CNC turn-mill machine. The objective was to produce a twin-screw from 42CrMo4 alloy steel. At cutting data of 3220 rpm spindle speed, 1500 mm/min (590 in/min) feed speed, 10 mm (0.394 inch) axial depth of cut (nominal), and 20 mm (0.787 inch) radial depth of cut, the mechanical locking interface generated a stable process with no pull-out. In addition, productivity increased due to longer tool life.

Collets are available to suit an assortment of common Weldon shank sizes. Accessories include assembly tools and anchor screws.
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