Drill bit for hard rocks, drilling rig and percussion drilling of hard rocks

FIELD: process engineering.

SUBSTANCE: set of inventions relates to percussion drilling of rocks. Drill bit comprises head to be secured at drilling rig drill element end in diameter larger than that of said drill element. Drill bit front end is shaped to truncated cone composed by the ring extending over the perimeter. Said ring is equipped with multiple gage teeth spaced apart over ring length for contact with material to be destructed. Central flushing channel extending the drill bit head has at least one flushing bore exposed at front end for feed of flushing medium to front end. At least one peripheral flushing bore extends from at least one flushing opening in said ring. Said flushing channel comprises section terminated at peripheral flushing bore and directed to force flushing medium to the spot on material in contact with gage tooth during the next percussion of drill bit. Note here that flushing fluid is directed to the shaft drilled in tocks. Note here that at least two peripheral flushing bores open in said ring.

EFFECT: higher rate of drilling.

16 cl, 13 dwg

Technical field AND background of the INVENTION

The present invention relates to a drill bit for percussive drilling of hard rocks, containing the head of a chisel, made with the possibility of attachment to the end of a drill element of a drilling Assembly and having a diameter greater than the diameter of the drill element having at the front end in the direction of drilling, in General, the shape of a truncated cone formed by passing essentially along the perimeter of the ring, armed with a multitude of gage Zubkov, distributed along the length of the ring for contact with the material subject to destruction, Central flush channel extending through the head of the bit and having at least one flushing hole, opening at the front end, at least one peripheral flushing hole from at least one flushing hole opening at the front end opens in the specified ring, and drilling arrangement and a method of percussion drilling in hard rocks according to the preambles of the corresponding appended claims.

The invention is not limited to any type of drill layout to use drill bit for hard rock, but can be drilling machine with impact mechanism and drilling machine with external impact mechanism.

In addition�about, drill bit for hard rock can be of any possible size and usually has a diameter of 30 mm - 300 mm. a Similar lack of restrictions applicable to set the impact frequency and the speed of rotation of the drill bit for hard rock in the operation, although it may be mentioned that they usually are in the range of 20 Hz - 500 Hz 20-500 rpm, respectively.

Fig. 1 shows a known, standard drill bit 1 hard rock type described in the introductory part of the description. The drill bit head has 2 bits, made with the possibility of attachment at one end of the boring element, for example in the form of a drill pipe or drill rods of a drilling Assembly and having a diameter greater than the diameter of the drill element. The drill element is not shown in the figure, but can be performed with the possibility of placement in connecting the clutch 3, integral with the head of the bit and having a diameter smaller than the diameter of the head bit. Other ways of connecting the drill bit with drill element are possible and known in the art. The head bit is at the front in the direction of the drilling end 4 in General, the shape of a truncated cone having a tapering to a cone to the front of the section, in essence, passing on the perimeter of the ring 5 with the set of calibration Zubkov 6, is�s along the length of the ring for contact with the material, subject to destruction. Data calibration the teeth are made of hard material such as cemented carbide. End teeth 7, also made of solid material, placed on the end surface 8 for contact with the material subject to destruction.

Drill bit for hard rock also has Central flush channel extending through the head bit and rinsing inlet opening 9 in the end surface. Used washing medium is usually compressed air, when drilling is performed from the surface of the earth and liquid, such as water, when drilling perform drill layout, installed under the ground.

When using calibration 6 teeth in contact with the rock and destroy it near the walls of the wellbore in which the drill bit with the rod, and front teeth 7 must destroy the rock closer to the center of such a barrel blows of the chisel in the direction of arrow A. the Drill bit must be rotated by some angle, usually about 5°, between each kick. Cuttings generated as a result of rock failure teeth 6, 7, should be removed to ensure the effective destruction of the teeth of the new rock during the next kick. The removal is carried out using a flushing medium emerging from the flushing hole�ia 9 and wiping away the sludge, who moves back in the opposite direction And drilling, through the recess 10 in the periphery of the bit and head along the coupling 3 and drill element having a diameter smaller than the head diameter drill bit and drilling the wellbore. Sludge washed out outside of the drill bit.

The performance of the drill bit for hard rock of this type is an important feature and it can be expressed as the rate of penetration of the drill bit, defined as the length of the barrel drilled per unit of time (meters/min). The rate of penetration may depend on the wear Zubkov and washing efficiency. Naturally, constantly attempted to increase the rate of penetration of the drill bit for hard rock type specified in the introductory part of the description.

Publication WO 2005/010317 A1 refers to having reverse circulation drilling machine with impact mechanism on the bottom for sampling, in which the direction of air up the channel sampling reduces the air pressure and the volume flow on the cutting edge, reducing erosion of the wellbore. In the publication WO 2004/003334 A1 discloses a drill bit, provides a range of wash channels. In U.S. patent 6767156 B1 described the drill bit having a plurality of flushing channels. In U.S. patent 4819746 A disclosed having clicks�capital circulation hammer bit. In U.S. patent 3997011 A, on which is based the preamble of claim 1 of the claims described a bit of hard rock having a plurality of flushing channels.

Summary of the INVENTION

The aim of the present invention is to provide a drilling bit for hard rock type defined in the introductory part, made with the possibility of increasing the rate of penetration is already known about drill bits for hard rock.

This goal is achieved according to the invention thanks to the creation of the drill bit for hard rock, in which the flushing channel has at least two peripheral flushing holes opening into, essentially, the perimeter ring.

Thanks to this placement, at least two peripheral flushing holes in, essentially, the perimeter ring flushing calibration Zubkov drilling bit for hard rock can be improved and the rate of penetration of the drill bit can be increased. The reason is that more force is required to fracture the rocks near the wall of the wellbore during drilling than at its center, so especially important is the proper flushing of the calibration Zubkov for their contact with the monolithic rock, and not with the slurry during the impact. This flushing hole may be followed�become effective removal of sludge educated gauge teeth, swiping at monolithic rock in the zone of the wall of the barrel, which should be applied the next stroke calibration cloves. In fact, it appears that the increase rate of penetration of the drill bit according to the present invention becomes particularly noticeable when the calibration teeth acts wear, so that you can unexpectedly effective to drill in this drill bit, even when it's worn out.

According to the embodiment of the present invention, at least three peripheral circulation ports are opened, essentially, the perimeter ring to optimize flushing.

According to the embodiment of the present invention, at least four peripheral circulation ports are opened, essentially, the perimeter ring for further optimization of leaching.

According to the embodiment of the present invention, at least one flushing hole opens only in passing on the perimeter of the ring for further optimization of leaching. This means that the edge of the at least one flushing hole only intersects the perimeter of the ring.

According to the embodiment of the present invention the flushing channel contains the plot for�animousity, at least two peripheral flushing holes and directed so that the jet of flushing medium from the orifice strikes the spot on the material that needs to get in touch calibration clove during the next stroke of the drill bit. The location and direction of the flushing holes provides shock calibration cloves, monolithic solid rock during the next shot, resulting in a high rate of penetration of the drill bit. The path followed by the calibration of the tooth during rotation of the drill bit between two consecutive impacts, should also be washed clean, so that the sludge does not move the gauge cloves to the spot for the next shot. According to another embodiment of the invention, each of at least two peripheral flushing holes opened in, essentially, the perimeter ring on the front of the gauge teeth, when viewed in the direction of working rotation of the drill bit. This place the ports facilitates the obtaining of efficient washing stains on the material that needs to get in touch calibration clove during the next stroke of the drill bit.

According to another embodiment of the invention, the place of opening of each peripheral flushing holes is at a distance�AI to gauge cloves, situated next behind it, when viewed in the direction of working rotation of the drill bit, comprising 10-50% or from 10-30% of the distance from the calibration cloves until the next calibration cloves before him in the direction of rotation.

According to another embodiment of the invention, the flushing channel contains a plot ending in each peripheral flushing the hole and made with the possibility of creating a jet of flushing medium, leaving the ring in the direction of a similar angle ±10°, such as 90°, to the surface, essentially, the perimeter of the ring, which forms a ledge calibration cloves with the surface. With this direction of the section of the flushing channel and through the jet wash of the medium is achieved by effective cleaning-rinsing the stain material, which strikes calibration clove.

According to another embodiment of the invention, the flushing channel has a volume of flush holes at least equal to the number of calibration Zubkov, and each calibration clove is associated with the rinsing inlet section of the flushing channel, ending in him and directed so that the jet under the pressure of the flushing medium strikes the spot on the material with which to make contact calibration clove during the next warborough bit. This means that all calibration teeth of the drill bit needs at every blow to strike, essentially, only on monolithic solid bedrock, resulting in a high rate of penetration of the drill bit.

According to another embodiment of the invention, the head has a bit of the end surface surrounded by, essentially, the perimeter ring and supplied with a set end Zubkov, in contact with the material subject to destruction, and the flushing channel has at least two circulation ports opening into the end surface. In this embodiment ensures efficient washing such end Zubkov and increases the rate of penetration of the drill bit.

According to another embodiment of the invention, the flushing channel has at least one flushing hole opening into the end surface and associated with calibration cloves plot of the flushing channel, ending in him and aimed to strike a jet of flushing medium to stain the material with which to make contact calibration clove during the next stroke of the drill bit. Such an arrangement, at least one flushing hole provides improved flushing face Zubkov while ensuring proper rinsing ka�abrevadero cloves, associated.

According to another embodiment of the invention, the flushing hole end surface associated with calibration cloves, located at a distance from the ring constituting at least 10% of the radius of the circle formed by the inner boundary of the ring. This provides a result in the direction of the flushing medium from the hole, contributing to the flow of the flushing medium from the peripheral flushing holes opening into, essentially, the perimeter of the ring, across the front of the drill bit to wash face Zubkov.

According to another embodiment of the invention, the calibration teeth except one have the flushing hole opening into, essentially, the perimeter ring associated with them, and one designated calibration clove has an opening flush opening in the end surface associated with it. This provides a highly effective washing of all calibration Zubkov and end Zubkov of the drill bit.

According to another embodiment of the invention, each peripheral flushing hole has a cross sectional area less than the cross sectional area of the base calibration cloves.

According to another embodiment of the invention, each of the peripheries�th flushing hole has a cross sectional area less than 50%, such as 5%-40% or 10% -30% of the cross sectional area of the base calibration cloves.

The invention also relates to a drilling arrangement for percussive rock drilling and a method of percussion drilling of rock according to the independent claims for the layout and method. Drilling arrangement and a method of percussion drilling of rock provides drilling solid rock with increased ROP compared with the known drill bits for hard rock.

The invention also relates to the use of the drill bit for hard rock according to the invention for percussion drilling of rock in the material, such as hard rock.

Further advantages and preferred embodiments of the invention are disclosed in the following description.

BRIEF description of the DRAWINGS

The following is a description of embodiments of the invention in the form of examples with reference to the accompanying drawings.

The drawings show the following.

Fig. 1 shows in perspective a known drill bit for hard rock.

Fig. 2 shows the corresponding Fig. 1 view of the drill bit for hard rock according to the first embodiment of the invention.

Fig. 3 shows an end view of the drill bit for hard rock according to Fig. 2.

Fig. 4 is a view booborowie bits for hard rock according to Fig. 2.

Fig. 5 shows a longitudinal section of the drill bit for hard rock according to Fig. 2.

Fig. 6 shows a graph of the rate of penetration drilled from the known distance for the drill bit for hard rock according to Fig. 1 and the drill bit for hard rock of the invention according to Fig. 2.

Fig. 7 graphically illustrates the drilling of 25 barrels of known drill bit for hard rock according to Fig. 1 and drill bit for hard rock of the invention according to Fig. 2.

Fig. 8 shows a graph of the rate of penetration to the average length of wear on the calibration cloves known drill bits for hard rock according to Fig. 1 and drill bits for hard rock of the invention according to Fig. 2.

Fig. 9-12 shows the views from the yard of drill bits for hard rock according to additional embodiments of implementing the present invention.

Fig. 13 shows a greatly simplified view of a drilling arrangement for percussion drilling of rocks according to the embodiment of the present invention in operation.

DETAILED DESCRIPTION of embodiments of the INVENTION

The drill bit 20 hard rock according to the first embodiment of the present invention is described below with reference to Fig. 2-5. This drill bit is different from the known drill bit, �provided in Fig. 1 and described above, only the end of the flushing channel and the location of the flushing holes. Accordingly, the drill bit 20 has a head 21 bits, made with the possibility of attachment at one end of a drill element of a drilling Assembly and is integral with a coupling 22, which may be configured to place the drill element. Any other method of attachment of the drill element to a drill bit is possible. Head drill bit has a diameter larger than the diameter of the connecting couplings 22 and, accordingly, the drilling element. The head bit is at the front end 23 when viewed in the direction of drilling (arrow A), in General, the shape of a truncated cone, formed essentially by a ring 24 with a perimeter in the form of a circle, is equipped with four gauge teeth 25 of a rigid material, such as sintered cemented carbide, spaced at equal intervals along the length of the ring and passing essentially perpendicular to the surface 26 of the ring. Three end teeth 27 of solid metal is placed on the end surface 28, surrounded by a ring. Central flushing channel 29 includes four wash area 30, 31 (Fig. 5), each of which ends flush hole 32-35. The ports 32-34, opening in to�Lite 24, referred to as peripheral flushing holes. Three peripheral flushing holes 32-34 open in the ring 24, and one flushing aperture 35 opens in the end surface 28. Cross-sectional area of each of the ports 32-35 may be, but not necessarily, less than the cross sectional area of the ports in the corresponding drill bit for hard rock type shown in Fig. 1. Preferably, at least two peripheral flushing holes 32-34 open in the ring 24 to optimize cleaning. Each calibration tooth 25 is associated with flushing hole 32-35, which ends in the section of the flushing channel that directs the pressurized spray of wash environment that strikes the spot on the material with which to make contact calibration clove during the next stroke of the drill bit. Three peripheral flushing holes 32-34 placed in the ring 24 is located on the spot before calibration cloves 25, 25' and 25", related in the direction of working rotation of the drill bit.

The action of the drill bit for hard rock according to this embodiment of the invention described below also with reference to Fig. 13, which schematically shows a drilling arrangement for percussive rock drilling according to the present �the turbine zobretenie. This drill layout is the so-called layout drill with external shock mechanism acting on the drill bit to the rock from the place above the earth, and has a power means 36, such as a hydraulic motor, is arranged to impact on the drill element 37 and use it on the drill bit for hard rock (Fig. 5) for rotation of the latter and of strikes in contact with the material subject to destruction. The design of the drill layout in the form of a drill with a percussion mechanism on the bottom is also in the scope of the present invention.

Drill arrangement also has means 38, such as a generator of compressed air, made with the possibility of washing out of the sludge formed as a result of the contact of the calibration Zubkov Zubkov and end of the drill bit with removing it from the zone occupied by the drill bit. Drill arrangement has a device 39 control, configured to control action of the power means 36 for adapting the frequency of shocks and the speed of rotation of the drill bit to perform attacks on the stain on the material with which to make contact calibration clove during the next stroke of the drill bit, with a jet of flushing medium from the flushing holes 32-35. This variant of the implementation of the�also includes power means, is arranged to drive the drill element 37 with a predetermined constant frequency of attacks and the speed with which adaptation is achieved based data in the development of the drill bit for hard rock by location of flush holes and the direction of the plots flushing channels terminating in these holes.

A jet of flushing medium from the flushing holes 32-35 have to clean the parts of the wall of the barrel 40, drilled in the rock, beneath the respective calibration cloves during the next stroke, so that the calibration teeth must essentially only to strike the monolithic rock and destroy the rock more effectively than when the sludge is present at the point of impact of the calibration teeth. The location of one flushing hole 35 in the end surface provides a jet of flushing medium from the hole in the direction from the center of the drill bit for hard rock, as seen in Fig. 3, which counteracts stagnation flush matter at the center of three peripheral flushing holes, where the front teeth 27 so that these places should be properly washed.

Comparative experiments were performed with known standard drill bit for hard rock according to Fig. 1 and drill bit In the d�I solid rock of the invention according to Fig. 2 to study the effect of changes in flushing on ROP. Test drilling bit for hard rock had a diameter of end bits constituting 45 mm, four calibration cloves in diameter at the base, constituting 10 mm, and three end cloves in diameter at the base, constituting a 9 mm Drill bits for hard rock had a connecting coupler with a diameter amounting to 39 mm.

Drill bits for hard rock was spudded in a new surface to the bottom at the test mine. Drill layout warmed up drilling with the help of used bits for about five minutes before the tests. Hex rod 37 is inserted into the drilling machine 41, which permitted the drilling of the shafts length, component 4.1 meters. During drilling, each barrel was recorded average ROP and also possibly other data, such as the sticking of a drill bit during drilling.

After drilling of every five barrels, drill bits were photographed with a digital camera, and each tooth was imaged using a compact microscope with USB connected to laptop computer. Drill bits drilled 25 trunks with ROP usually less than 3 meters/per minute.

To measure wear Zubkov microscope image is read by using the processing program of Fig�message. Then measured the wear manually on the shortest distance of the ellipse edge wear.

Fig. 6-8 shows the test results, where Fig. 6 shows the rate of penetration in meters drilled per minute, standard bit A according to Fig. 1 depending on distance drilled for drilling bits A and B. it is Seen that the velocity Pr of penetration of the drill bit In hard rock according to the present invention relative to a standard drill bit increases with A distance drilled, which means that it bores over time faster than a standard drill bit with wear Zubkov and chisels.

Fig. 7 shows the bores 25 of the shafts relative standard bit A.

Fig. 8 shows the rate of penetration in meters/per minute depending on the average length Mwl wear on the calibration of the clove, and it is clear that a standard drill bit according to Fig. 1 has a smaller ROP due to the specific wear rates than the drill bit for hard rock of the invention according to Fig. 2.

The achievement of the above results can be explained as follows. Modeling shows that a standard drill bit according to Fig. 1 obviously has a worse flush than the drill bit of the invention according to Fig. 2, which means the teeth must move more mud rocks than in the case�e of the drill bit according to Fig. 2. Reduced interaction with monolithic rock should reduce ROP. Improved rinsing calibration Zubkov drill bit according to Fig. 2 should increase contact with the monolithic rock and, consequently, lead to increased ROP.

Thus, the results show that the improved flushing and design bits may increase the rate of penetration on the order of 10%, and the results show that the bit with the new design of washing according to Fig. 2 can drill faster with some wear and tear than a standard drill bit according to Fig. 1.

The most important result of the new configuration of the ports according to the present invention, obviously, is that it becomes possible to more rapid drilling of worn teeth of such a drill bit than a standard drill bit.

Some of the many possible modifications of embodiment of the flushing hole drilling bits in the scope of the present invention shown in Fig. 9-12.

Drill bit for hard rock according to Fig. 9 has two peripheral flushing holes 32', 33', associated with two consecutive calibration teeth 25, 25', resulting in contact with the monolithic rock data ka�ibrooklyn Zubkov in every shot at the same time, end teeth 27 have satisfactorily be cleaned due to the fact that the flushing medium flowing to the center, should not oppose the passage of a flushing medium in the opposite direction.

Fig. 10 shows that each calibration clove has the flushing hole is placed in, essentially, the perimeter ring and associated for proper rinsing of the spot on which the calibration clove should strike next.

Fig. 11 shows the embodiment of the ports, the corresponding shown in Fig. 9, with the flush hole 35' in the end surface associated with calibration cloves 25"'.

Fig. 12 shows the normal appearance of the drill bit for hard rock, which has a larger diameter and a greater number Zubkov, in this case six calibration Zubkov and eight end Zubkov. Each calibration clove has the flushing hole in the perimeter ring associated with him, and two circulation ports 42, 43 are made in the end surface, mainly for removal of the sludge formed as a result of the contact end Zubkov with the rock.

The invention is in no way limited to variants of implementation described above, but many possibilities of modifications clear to the specialist in Dan�Oh engineering in the scope of the invention, defined in the attached claims.

The invention can be applied to a drill bit machine with impact mechanism on the bottom. The percussion mechanism on the bottom typically includes an outer cylindrical body, connected to the rotating column of drill pipe through which compressed air is applied. The piston shock mechanism reciprocatingly moved in the cylindrical housing, and the compressed air is directed alternately to the upper and lower ends of the piston, resulting in its reciprocating movement in the housing, where each move down strikes on the anvil of the drill bit held up in the lower section of the cylindrical housing. The piston and the drill bit include channels for passage of compressed air.

The number and position Zubkov drilling bit for hard rock may be significantly different from the embodiments shown in the figures. The grooves for the return flow of the slurry can have different shapes, and the head of the bit can also be provided with a channel for removal of sludge and flushing medium. Given only a few examples of possible modifications.

"Generally" and "substantially" used in the expression "in General, the shape of a truncated cone, essentially, the perimeter ring" for the coverage option in which uglubleniye grooves for cuttings and/or calibration teeth cut ring as shown in the figures.

1. Drill bit for percussive drilling of hard rocks, containing the head (21) bits, made with the possibility of attachment on the end of a drill element of a drilling layout having a diameter greater than the diameter of the drill element, and having at the front end (23) in the direction of drilling in the General shape of a truncated cone, formed, essentially, the perimeter ring (24), equipped with a set of calibration Zubkov (25) spaced from each other along the length of the ring for contact with the material subject to destruction, the Central flushing channel (29), passing through the head of the bit and having at least one flushing hole (32-35), opening at the front end for supplying flushing medium to the front end, at least one peripheral flushing hole (32-34) from at least one flushing hole (32-35) opens in the specified ring (24), characterized in that the flushing channel section (31), ending with a peripheral rinsing inlet (32-34) and directed so that the jet of flushing medium from the hole hits the spot on the material with which the contacts of the calibration clove (25) during the next stroke of the drill bit, and a jet of flushing medium from the flushing hole�s (32-35) focused on areas of the wall of the barrel (40), drilling in rock, in this case, at least two peripheral flushing holes (32-34) are opened in the specified ring (24).

2. The drill bit according to claim 1, characterized in that at least three peripheral flushing holes (32-34) are opened in the specified ring (24).

3. The drill bit according to claim 1 or 2, characterized in that the at least four peripheral flushing holes (32-34) are opened in the specified ring (24).

4. The drill bit according to claim 1 or 2, characterized in that each peripheral flushing hole (32-34) opens in the specified ring (24) in place ahead of the calibration cloves (25) in a given direction of rotation of the drill bit.

5. The drill bit according to claim 4, characterized in that the location of each flushing hole (32-34) is at a distance from the calibration cloves (25) located next to it in a given direction of rotation of the drill bit, comprising 10-50% or from 10-30% of the distance from the calibration cloves until the next calibration cloves (25') ahead of him in the rotation direction.

6. The drill bit according to any of claims. 1, 2, 5, characterized in that the Central flushing channel (29) comprises a portion (31) ending in each flushing hole (32-34) and is made with the possibility of creating a jet of flushing medium, leaving the ring in the direction under odinakovogo ±10°, such as 90°, to the surface of the specified ring (24) formed with a surface protrusion gauge cloves (25).

7. The drill bit according to any of claims. 1, 2, 5, characterized in that the flushing channel (29) has a volume of flush holes (32-35) at least equal to the number of calibration Zubkov (25), and each calibration clove is associated with the rinsing inlet section of the flushing channel, ending in him and directed so that the jet of flushing medium hits the spot on the material with which the contacts of the calibration clove during the next stroke of the drill bit.

8. The drill bit according to any of claims. 1, 2, 5, characterized in that the head (21) of the bit has a face surface (28) surrounded by the specified ring (24) and supplied with a set end Zubkov (27) adapted for contact with the material subject to destruction, and the flushing channel (29) has at least one flushing hole (35) opening into the end surface.

9. The drill bit according to claim 8, characterized in that the flushing channel (29) has at least one flushing hole (35) opening into the end surface and associated with calibration cloves (25'") plot (30) of the flushing channel, ending in him and directed so that the jet of flushing medium strikes the spot on the material with which conta�ciruit calibration clove during the next stroke of the drill bit.

10. The drill bit according to claim 9, characterized in that the flushing hole (35) in the end surface associated with calibration cloves (25"'), is located at a distance from the specified ring (24) constituting at least 10% of the radius of curvature of the inner border of the ring.

11. The drill bit according to claim 8, characterized in that the calibration of the teeth, except for one cloves (25"'), have the flushing hole (32-34), opening in the specified ring (24) associated with them, and one calibration clove (25) has a flushing hole (35) opening into the end surface (28) associated with it.

12. The drill bit of any one of claims. 1, 2, 5, 9-11, characterized in that each peripheral flushing hole (32-34) has a cross sectional area less than the cross sectional area of the base calibration cloves (25).

13. The drill bit according to any of claims. 1, 2, 5, 9-11, characterized in that each peripheral flushing hole (32-34) has a cross sectional area constituting less than 50%, such as 5%-40% or 10% -30% of the cross sectional area of the base calibration cloves (25).

14. Drill layout for percussive drilling of hard rocks, containing the drill bit (20) hard rock, power means (36), is arranged to impact on the drill bit for rotation and implementation of blows to contact materialam, subject to destruction, and erosion of sludge produced as a result of the contact of the zone occupied by the drill bit, and a device (39) to control the action of the power means, characterized in that the drill bit is a drill bit (20) hard rock according to any one of claims. 1-13, and a device (39) the control is arranged to control the power means (36) for adapting the frequency of shocks and the speed of rotation of the drill bit to hit the spot on the material with which the contacts of the calibration clove (25) during the next stroke of the drill bit, through the establishment of a flushing medium from each of at least two peripheral flushing holes (32-34), opening in, essentially, the perimeter ring (24).

15. The use of the drill bit for hard rock according to any one of claims. 1-13 for percussion drilling of rock, such as solid rock.

16. Method of percussion drilling of rock, characterized in that the power means (36) of the drill layout, equipped with a drill bit (20) hard rock according to any one of claims. 1-13, manage to adapt the frequency of shocks and the speed of rotation of the drill bit to hit the spot of the material with which the contacts of the calibration clove (25) during the next stroke of the drill bit, simply�PTO create a flushing medium from each, at least two peripheral flushing holes (32-34), opening essentially in passing on the perimeter of the ring (24).