NEW PRODUCTS and INNOVATIONS Top-class drilling rate with long tool life Jun 2011
Sandvik News Release
Higher penetration rates and a longer life for drilling tools are the features offered by two new rock drills from Sandvik.
The new RD525 and RD520 hydraulic percussive rock drills that provide a higher frequency than other models and feature a simple yet advanced stabilizer construction that efficiently dampens harmful shock waves reflected from the rock. These translate into an almost 17% higher penetration rate and a significantly longer tool life. While subject to rock conditions and drilling parameters, the new drills have shown a 40% longer life for the shanks and 17% for the bits when compared in tests with the HLX 5 drill.
Body structure of the new and robust percussive drills

Body structure of the new and robust percussive drills

Table 1. RD525/RD520 specifications
Drifting hole diameter 43mm to 64mm
Cut hole diameter 76mm to 127mm
Power class 25kW and 20KW
Percussion rate 94Hz and 74Hz
Max percussion pressure 235bar and 220bar
The RD525 supplies a real power level of 25kW and of 20kW for the RD520. A simple body structure with a minimum number of parts, a modular construction, and visual wear indicators, guarantee ease of service for the new units. With only few pressurized seams between functional modules, both models exhibit robust and reliable performance.
"The focus of the development was to improve reliability and serviceability, but without compromising performance", said Tomi Haapaniemi, Product Manager, Rock Drills at Sandvik. "Our target was to maximize total uptime in various customer drilling conditions. We have run numerous field tests in tough conditions, and they have clearly shown that the target has been reached."
In addition to face drilling in tunneling and mining, the new RD525/RD520 drills are suitable also for bolt hole, exploration and injection hole drilling.

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