Partner in the mining industry
Mining is as old as human history itself. Even during the Stone Age, people mined mineral resources – in the form of flints. Today, MAPAL also makes a small contribution to mining in the modern era as a partner to manufacturers of mining drilling tools.
Drilling tools an important part of modern mining
The drilling tools that break the rock and carry it out in chunks are an essential part of the process when blast drilling, drilling for pipelines or creating new shafts in mines, for example. Rotary bits are often used for larger diameters in a range of applications. These usually consist of three movable rollers. These rollers rotate and press against the rock. In this way, the rock particles are gradually broken off. The use of drill bits has also already proven its worth in the field of mining, especially for smaller diameters. They work hand-in-hand with the corresponding tool holder and the machine according to the same principle as a hammer drill.
Both types of tools (rotary bits and drill bits) have in common that their steel tool bodies (cold-work steel, alloyed tempering steel or special steel) are equipped with bit inserts made of carbide in order to break even very hard rock. After all, the bit inserts are literally at the forefront when it comes to creating the different cavities in the various types of rock and soil.
Machining the seats for the bit inserts with µm precision
The Rockbit-Drill in detail
Successful use in practice
One of MAPAL’s customers is successfully using the new Rockbit-Drill with a diameter of 16 mm for their drill bits. The manufacturer produces the drill bits from low-alloy steel on a machining centre with a hollow shank taper A63 spindle. The drilling depth is 1xD-1.5xD.
• Cutting speed 80 m/min
• Spindle speed 1,600 rpm
• Feed 0.2 mm
The Rockbit-Drill can reliably process 1,618 bores. The customer is delighted: “We used to use a different tool from a competitor, but we could only machine 600 bores with that.” The customer was able to double the feed rate compared to what they could achieve using the previous tool. And, in this way, they could significantly increase the number of cycles. In addition, the MAPAL tools produce an optimum surface quality of Ra (average roughness value) = 0.8 µm. The Rockbit-Drill has convinced the customer in every respect – both with the accuracy of the bores and the low burr formation.