Production Machining

AUG 2018

Production Machining - Your access to the precision machining industrial buyer.

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Here's another article on this topic: e Basics of Rotary Broaching is effective process creates a non-round shape on the inside or outside of a part. LINK :: short.productionmachining.com/rotabroach the depth of cut should be the first action to take when poor chip control is present. Feed is also very critical to correct chip control. If the feed is too low, the chip will form on the hone and primary rake and not make use of the chip control geometry. Low feed rates can also cause the workpiece material to build up on the cutting edge and change the chip behavior. On the other hand, if the feed is too high, the chip can become too compressed, which can result in high pressure and tool breakage. Cutting speed also plays a role in chip control. It has a lesser effect than the feed, but can be an option when other changes to the process are not successful. Cutting speed that is too low can be a detriment to chip control. BUE effects may nullify the chip geometry, or the heat in the cutting zone may be too low, which does not transition the material to a more brittle phase. Using cutting speed that is too high can deform the cutting edge and change the chip control behavior completely. When other options have failed, programming changes can still aid in chip control. For grooving, speed pecking can be incorporated. is process involves the deliberate division of passes into smaller plunges. e grooving tool is plunged into the workpiece material at about 0.015 inch, for example. At each plunge, the cutting tool is retracted half the feed rate and moves to the next depth. Pecking in rapid succession does not significantly increase the cycle time. Horn USA Inc. | 615-771-4100 | hornusa.com Precision Machined Products Association | 440-526-0300 | pmpa.org Somma Tool Co. Inc. | 203-753-2114 | sommatool.com CUTTING TOOLS 34 PRODUCTION MACHINING :: AUGUST 2018

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