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Replaceable and Regrindable Drill Heads

Story added 04 February 2012.

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A breakthrough in detachable replacement head drilling technology is launched at MACH 2012 by Sumitomo Electric Hardmetal (Stand 5369) which brings new orders of flexibility and tool inventory reduction by enabling up to five drill sizes to be accommodated by one drill body. Drill heads can also be selected to suit the machine type/power available and the material being processed. In addition, the new Sumitomo drill is able to achieve a level of hole tolerance normally only met using the reaming process with the added bonus of maintaining improved hole consistency and in-cut life.

The Sumitomo Multi-Drill SMD now available from Sumitomo Electric Hardmetal of Princes Risborough has a large range of diameters available between 12 mm and 42.5 mm and can be specified in short (3 x D), long (5 x D) or as a deep hole (8 x D) series with effective drilling depths up to 244 mm. Due to the balanced design of the tool vibration and noise generated under-cut are reduced.

There are also two variants of drill head with ultra-hard and smooth PVD coating, having improved peeling and chipping resistance. MTL ACX70 is for general purpose drilling applications and MEL ACX80 where the design of the drill head will provide higher performance on lower powered machine spindles. This is achieved due to the decrease in cutting force (thrust) requirement, that is some 25 per cent lower, making this variant of the drill ideal for stainless steel or more difficult cutting conditions.

The replaceable drilling head is located on precision ground radial serrations that are fixed to form a rigid and positive clamping platform. The specially treated and surface toughened SMD nickel plated steel body is able to resist wear and oxidation.

The two styles of cutting head SMDT-MEL and MTL are secured with two screws and through the tool coolant supply channels are designed to optimise coolant flow, pressure and direction while maximising heat dissipation. Both head types can be reground which further extends the return on productivity, overall processing life cycle and reduces tool inventory costs.

The SMDT-MEL drill head has a light edge preparation and is coated with Sumitomo’s latest ACX80 ideal for soft steel where cutting speeds between 80 and 130 m/min and feed rates between 0.15 and 0.4 mm/rev can be maintained. Stainless steel and super alloys can be drilled between 50 and 90 m/min with feed rates between 0.1 to 0.25 mm/rev and grey cast iron 50 to 100 m/min with 0.2 to 0.45 mm/rev feed.

Meanwhile, the SMDT-MTL drill head type has a standard edge preparation and is coated with ACX70 for general carbon steel applications with cutting speeds between 80 and 130 m/min and feed rates of 0.15 to 0.35 mm/rev. Hardened steel (HRC45) can be drilled between 50 and 90 m/min with feed rates of 0.1 to 0.25 mm/rev. Nodular cast iron components can be processed at speeds of 70 to 110 m/min and feed rates between 0.15 to 0.4 mm/rev.

There is also a special MB designation of drill head for structural steel applications.

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