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Deep Hole Drilling Innovation

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In this issue, MEGA Tech would like to discuss the latest innovations of 2 drills, the VB80/ VB100, Cast machining at twice the speed, and the RT 100T, deep hole drilling with solid carbide spiral fluted gun drill EXCLUSIVE LINE. Both models have been developed with 40xD drilling depth technology to increase the efficiency of deep hole drilling. and work up to 2 times faster.

Deep Hole Drilling Innovation

VB 80 and VB 100

Deep Hole Drilling Innovation

VB 80 and VB 100

               Gühring has developed a new tool technology that can produce drilling depths of up to 40xD. This technology can work up to twice as fast compared with conventional methods – even when drilling deep holes, reducing the cycle time considerably, sometimes by several minutes, significantly increases capacity.

               The crux of the matter: The machine related limits of axial force and torque are limited on many machines. The drilling quality and tool life must also remain the same as with conventional methods. Working in partnership with a customer, Gühring developed a new power technology: The four-fluted deep hole drill VB 80 and the four-fluted drill VB 100 are used to drill holes, pilot holes and stepped holes.

2+4 cutting edges for process reliability

               These tools are specially designed for castings. Their performance is based on the carbide made by Gühring from ultra-fine grains and the proven Signum coating. “This has proven to be the strongest layer for castings,” explains Philipp Kunze, developer in the field of deep hole drilling at Gühring. To cope with the high chip volume, Gühring uses its patented 2+4 cutting edge division. The main load of the massively increased feed per revolution is initially absorbed by the two inner cutting edges. These are supported by a thick core and a specially defined cutting wedge static. The special grinding for producing the transverse cutting edge ensures low forces. The four “peripheral cutting edges” are then used to absorb the high torque. Typical casting wear is divided over four instead of two cutting edges. The corner radii complete the system by creating the finest surface finishes. The result: shorter chips, higher cutting parameters and a significant increase in process reliability.                With regard to possible roundness, values of less than 10 μm have already been achieved with the four-flute drills. With diameter tolerances zones of up to IT7, the tool also outperforms established quality values, and surface values in the roughness class N8, sometimes even N7, can be

Deep Hole Drilling Innovation

Safe cooling and flexible voltage

               As with any high-performance drilling tool, the coolant supply is crucial for functional and process reliability. With the four-flute drills, the coolant or minimum quantity lubrication is transported via a central channel and a Y-distribution integrated into the solid carbide.

               From there, it is distributed highly efficiently to the front four channels and the cutting edges. This is necessary to flush the coolant chips produced during drilling out of the hole with maximum flow rates. The result: The tool geometry is also protected during high performance.

               The already tested diameter range for the VB 100 to 5xD drill is between 8.0 and 40 mm. With the VB 80 deep hole drill, diameters of 8 to 30 mm and tool lengths of up to 1000 mm can currently be produced.

RT 100 T

               With spiral deep hole drills type RT 100 T available as part of an extended ex-stock program for the drilling depths 15xD, 20xD, 25xD, 30xD and 40xD, the user benefits from maximum feed rates and cutting speeds and therefore benefits from a significant reduction in manufacturing times. Gühring achieves these advantages thanks to the following features:

Optimized flute cross-section gun drilling
               The spiral deep hole drills have a groove geometry specially adapted to the special requirements for optimum chip transport from deep holes.

Maximum coolant duct cross-section
               To optimally supply the cutting edge with lubricant, the tools possess coolant ducts with maximum cross-section. This ensures an effective lubricant supply to the cutting edge and excellent chip evacuation.

Problem-free chips
               The aforementioned factors in combination with the perfectly adapted cutting parameters to suit the application result in chips that are evacuated problem-free even from deep holes. Therefore, chip congestion and the herewith combined jamming of the tool is effectively prevented.

HA shank for accurate clamping
               For clamping with hydraulic chucks from Gühring’s GM 300 program the RT 100 T ex-stock range is equipped with a HA shank, shank tolerance h6. The combination of RT 100 T and hydraulic chuck guarantees maximum concentricity, extreme clamping force, minimal imbalance and optimal economic efficiency.

Article by: Guehring (Thailand) Co., Ltd. & MEGA Tech