CN206925358U - Drill bit and drilling tool - Google Patents

Abstract

The utility model provides a kind of drill bit and drilling tool, is related to rig technical field.Drill bit includes can be around the rotating shaft that own axes rotate,The first drill bit being connected with one end of rotating shaft,Along the multiple rotating disks being connected with the first drill bit being radially arranged of rotating shaft,Angle between multiple rotating disks is identical,And,Multiple second drill bits are evenly arranged with each rotating disk,Second drill bit be arranged in parallel with the first drill bit,And,Second drill bit tilts to the direction of the first drill bit,Solving spiral bit present in prior art can not be quick,Feel relieved exactly,Easily produce the technical problem that borehole trajectory deviates,Multiple rotating disks are set by the radial direction along rotating shaft on the first drill bit,And the second drill bit is provided with rotating disk,The direction of second drill bit to the first drill bit is obliquely installed,The first drill bit is set rapidly and accurately to feel relieved,Deviate so as to effectively prevent borehole trajectory,Improve the service life of the first drill bit,Substantially increase operating efficiency.

Description

Drill bit and drilling tool

Technical field

Rig technical field is the utility model is related to, more particularly, to a kind of drill bit and drilling tool.

Background technology

In drilling operation, often to use drill bit, drill bit be on solid material drilling go out through hole or blind hole, and The cutter of reaming can be carried out to existing hole.Conventional drill bit mainly has fluted drill, chit drill, centre drill, depth drill and cylindrical drill Deng.Due to organism internal structure, material and applied external force angular deviation, drilling often deviates in the original plan to four Produce deviation week, while it is the extremely difficult thing of part to want correction bore angle after track deviation.

Spiral bit is because the anterior angle numerical value change of each point on its main cutting edge is very big, before being negative close at drill core Angle, therefore, machining condition are poor, meanwhile, the chisel edge of spiral bit is oversize, has very big sword drift angle, there is very big negative rake again, So that machining condition becomes worse, thus the axial drag of spiral bit is larger, cutting energy consumption is big, and easily skids, it is impossible to fast Speed, feel relieved exactly so that the problem of borehole trajectory deviates is more obvious, especially when drill bit directly bores on the inclined-plane of workpiece Kong Shi, the position in hole are easily trained off, and with the increase of bevel angle, the probability that fractures of drill bit is substantially increased, therefore, existing Way be first to mill out plane in the plane with milling cutter, allow drill bit to be pierced with the plane perpendicular to preprocessing, come avoid drilling beat Partially, but so slow down processing beat, considerably reduce operating efficiency.

Utility model content

The purpose of this utility model is to provide a kind of drill bit and drilling tool, to solve spiral bit present in prior art It can not quickly and accurately feel relieved, easily produce the technical problem that borehole trajectory deviates.

Drill bit provided by the utility model includes around the rotating shaft that own axes rotate, with one end of the rotating shaft to be connected The first drill bit, the multiple rotating disks being connected with first drill bit being radially arranged along the rotating shaft；

Angle between multiple rotating disks is identical, also, is evenly arranged with multiple second drill bits on each rotating disk, Second drill bit be arranged in parallel with first drill bit, also, second drill bit tilts to the direction of first drill bit.

Further, the rotating disk is arc rotating disk, also, direction of rotation of the arc rotating disk along the rotating shaft is protruded Set.

Further, free end of the rotating disk away from first drill bit is provided with connecting rod, and the connecting rod is remote The free end of the rotating disk is provided with the 3rd drill bit；

3rd drill bit is vertically arranged with first drill bit, also, the 3rd drill bit is to first drill bit Direction tilts.

Further, the connecting rod is arc-shaped connecting rod, also, rotation side of the arc-shaped connecting rod along the rotating shaft To being uniformly arranged.

Further, first drill bit includes spiral bit and is arranged at the spiral bit away from the rotating shaft The pilot bit at end center；

The shoulder of end of the spiral bit away from the rotating shaft is provided with milling edge.

Further, the unbearable angle of the pilot bit is 120 °, and the core thickness of the pilot bit is 1.1mm.

Further, sharp corner of the milling edge away from the spiral bit is provided with rounding, the milling edge The protection face for protecting the wedge angle is provided with rake face.

Further, a width of 0.2mm of the land of the spiral bit, the back-off depth of the spiral bit is 0.15mm, The angle of cutting edge of the spiral bit is 1 °.

Further, first drill bit and second drill bit are made by Hardmetal materials.

Drilling tool provided by the utility model, including the drill bit as any one of above-mentioned technical scheme.

Drill bit provided by the utility model includes rotating shaft, the first drill bit, rotating disk and the second drill bit, and rotating shaft can be around itself Axis rotated, the first drill bit is connected with one end of rotating shaft, so that rotating shaft can drive the first bit, makes first Bit is crept into, and is cut to complete bore operation, rotating disk is arranged at the radial direction along rotating shaft, also, rotating disk is set Have multiple, multiple rotating disks are connected with the first drill bit respectively, so that rotating shaft drives rotating disk to rotate when rotating, by the first drill bit, Angle between multiple rotating disks is identical, because multiple rotating disks are centered on the first drill bit, angle and phase between multiple rotating disks Together so that multiple rotating disks are evenly arranged in the same sagittal plane of rotating shaft, so that rotating shaft, when rotating, rotating disk is around the shaft Axis rotates, and the first drill bit is rapidly and accurately felt relieved, will not produce bias, is advantageous to prevent borehole trajectory from deviateing, makes Rotating shaft possesses good stress, improves the service life of rotating shaft and the first drill bit.

Due in the prior art, when being crept into using single drill bit, by organism internal structure, material and applied external force angle The reason for deviation effects, drilling often deviates produces deviation to surrounding in the original plan, causes drill bit stray, and bore Head main cutting edge on each point anterior angle numerical value change it is very big, be negative rake close at drill core, therefore, machining condition compared with Difference, meanwhile, the chisel edge of drill bit is oversize, has very big sword drift angle, there is very big negative rake again so that and machining condition becomes worse, Thus the axial drag of drill bit is larger, cutting energy consumption is big, and easily skids, it is impossible to quickly and accurately feels relieved so that borehole trajectory The problem of deviation, is more obvious, and drill bit provided by the utility model is set more by the radial direction along rotating shaft on the first drill bit Individual rotating disk, and the second drill bit is provided with rotating disk so that the first drill bit and the second drill bit can synchronously be crept into, and be effectively reduced The probability that track deviates occurs for drilling, while substantially increases drilling efficiency.

Specifically, the second drill bit on each rotating disk is provided with multiple, and multiple second drill bits are uniform on rotating disk Arrangement, so that rotating shaft when rotating, the axis rotation of rotating disk around the shaft, will not produce bias, be advantageous to prevent borehole trajectory Deviate, rotating shaft is possessed good stress, the second drill bit be arranged in parallel with the first drill bit so that the first drill bit and second bores The drilling direction of head is identical, can realize synchronous drilling, and due to the rotation of rotating shaft, the first drill bit while laterally creeping into, Second drill bit can realize longitudinal drilling, so as to effectively expand the scope of drilling, while can be smoothly in boring procedure Chip is discharged, prevents the first drill chuck from bore inner, causing the damage of the first drill bit.In order that the first drill bit can be along pre- Orbit determination road is drilled, and the direction of the second drill bit to the first drill bit is obliquely installed, so as to be applied with incline direction to the first drill bit Power, because rotating disk and the first drill bit are coaxially disposed, the direction of the second drill bit to the first drill bit is obliquely installed, according to concentric original Reason, the first drill bit can rapidly and accurately feel relieved, and multiple second drill bits is applied on the first drill bit and make a concerted effort to ensure the One drill bit is crept into along planned orbit, keeps the stabilization of borehole trajectory, is deviateed so as to effectively prevent borehole trajectory, is reduced The probability that drill bit fractures, improves the service life of the first drill bit, substantially increases operating efficiency.

Brief description of the drawings

, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, describe below In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is the structure left view for the drill bit that the utility model embodiment provides；

Fig. 2 is the structural front view for the drill bit that the utility model embodiment provides；

Fig. 3 is the structural representation for the first drill bit that the utility model embodiment provides；

Fig. 4 is the structure left view for the first drill bit that the utility model embodiment provides.

Icon：100- rotating shafts；The drill bits of 200- first；300- rotating disks；The drill bits of 400- second；500- connecting rods；600- the 3rd Drill bit；210- spiral bits；220- pilot bits；211- milling edges.

Embodiment

The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality Novel protected scope.

, it is necessary to explanation in description of the present utility model, such as occur term " " center ", " on ", " under ", " left side ", " right side ", " vertical ", " level ", " interior ", " outer " etc., orientation or position relationship indicated by it be based on orientation shown in the drawings or Position relationship, it is for only for ease of description the utility model and simplifies description, rather than indicates or imply signified device or member Part must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model. In addition, such as there is term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or implying relative Importance.

, it is necessary to which explanation, unless otherwise clearly defined and limited, term such as occurs in description of the present utility model " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or one Connect body；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirect by intermediary It is connected, can is the connection of two element internals.For the ordinary skill in the art, on being understood with concrete condition State concrete meaning of the term in the utility model.

Embodiment 1 and embodiment 2 are described in detail below in conjunction with the accompanying drawings：

Fig. 1 is the structure left view for the drill bit that the utility model embodiment provides；Fig. 2 provides for the utility model embodiment Drill bit structural front view；Fig. 3 is the structural representation for the first drill bit that the utility model embodiment provides；Fig. 4 is this reality The structure left view of the first drill bit provided with new embodiment.

Embodiment 1

As depicted in figs. 1 and 2, a kind of drill bit is present embodiments provided, including can be around the rotating shaft that own axes rotate 100th, the first drill bit 200 for being connected with one end of rotating shaft 100, the multiple and phase of the first drill bit 200 being radially arranged along rotating shaft 100 Rotating disk 300 even, specifically：

Angle between multiple rotating disks 300 is identical, also, is evenly arranged with multiple second drill bits on each rotating disk 300 400, the second drill bit 400 be arranged in parallel with the first drill bit 200, also, the second drill bit 400 tilts to the direction of the first drill bit 200.

Drill bit includes rotating shaft 100, the first drill bit 200, the drill bit 400 of rotating disk 300 and second, and rotating shaft 100 can be around itself Axis rotated, the first drill bit 200 is connected with one end of rotating shaft 100, so that rotating shaft 100 can drive the first drill bit 200 rotations, make the rotary drilling of the first drill bit 200, are cut to complete bore operation, rotating disk 300 is arranged at along rotating shaft 100 Radial direction, also, rotating disk 300 is provided with multiple, and multiple rotating disks 300 are connected with the first drill bit 200 respectively, so that rotating shaft 100, when rotating, drive rotating disk 300 to rotate, the angle between multiple rotating disks 300 is identical, due to multiple turns by the first drill bit 200 Disk 300 is centered on the first drill bit 200, and the angle between multiple rotating disks 300 is again identical so that multiple 300 uniform cloth of rotating disk Be placed in the same sagittal plane of rotating shaft 100 so that rotating shaft 100 rotate when, rotating disk 300 around the shaft 100 axis rotation, The first drill bit 200 is rapidly and accurately felt relieved, bias will not be produced, be advantageous to prevent borehole trajectory from deviateing, make rotating shaft 100 Possess good stress, improve the service life of the drill bit 200 of rotating shaft 100 and first.

Due in the prior art, when being crept into using single drill bit, by organism internal structure, material and applied external force angle The reason for deviation effects, drilling often deviates produces deviation to surrounding in the original plan, causes drill bit stray, and bore Head main cutting edge on each point anterior angle numerical value change it is very big, be negative rake close at drill core, therefore, machining condition compared with Difference, meanwhile, the chisel edge of drill bit is oversize, has very big sword drift angle, there is very big negative rake again so that and machining condition becomes worse, Thus the axial drag of drill bit is larger, cutting energy consumption is big, and easily skids, it is impossible to quickly and accurately feels relieved so that borehole trajectory The problem of deviation, is more obvious, and drill bit provided by the utility model passes through the radial direction on the first drill bit 200 along rotating shaft 100 Multiple rotating disks 300 are set, and the second drill bit 400 is provided with rotating disk 300 so that the first drill bit 200 and the energy of the second drill bit 400 Enough synchronous drillings, effectively reduce drilling and the probability that track deviates occurs, while substantially increase drilling efficiency.

Specifically, the second drill bit 400 on each rotating disk 300 is provided with multiple, and multiple second drill bits 400 are turning Be evenly arranged on disk 300 so that rotating shaft 100 rotate when, rotating disk 300 around the shaft 100 axis rotation, will not produce partially The heart, be advantageous to prevent borehole trajectory from deviateing, rotating shaft 100 is possessed good stress, the second drill bit 400 and the first drill bit 200 be arranged in parallel so that and the first drill bit 200 is identical with the drilling direction of the second drill bit 400, can realize synchronous drilling, and by In the rotation of rotating shaft 100, for the first drill bit 200 while laterally creeping into, the second drill bit 400 can realize longitudinal drilling, so as to The scope of drilling effectively is expanded, while smoothly can be discharged chip in boring procedure, prevents the first drill bit 200 to be stuck in Bore inner, cause the damage of the first drill bit 200.In order that the first drill bit 200 can be drilled along planned orbit, second bores First 400 are obliquely installed to the direction of the first drill bit 200, so as to be applied with the power of incline direction to the first drill bit 200, due to rotating disk 300 are coaxially disposed with the first drill bit 200, and the direction of the second drill bit 400 to the first drill bit 200 is obliquely installed, according to concentric principle, First drill bit 200 can rapidly and accurately feel relieved, make multiple second drill bits 400 be applied on the first drill bit 200 make a concerted effort can Ensure that the first drill bit 200 is crept into along planned orbit, the stabilization of borehole trajectory is kept, so as to effectively prevent borehole trajectory Deviate, reduce the probability that drill bit fractures, improve the service life of the first drill bit 200, substantially increase operating efficiency.

In the alternative of the present embodiment, rotating disk 300 using arc rotating disk 300, arc rotating disk 300 in rotary course, Resistance is smaller, and stress is more preferable, also, the rotation direction of rotating shaft 100 property relevant with the protrusion direction of arc rotating disk 300, In order that arc rotating disk 300 can obtain less resistance in rotation process, arc rotating disk 300 should be along the rotation of rotating shaft 100 Direction protrusion is set, and arc rotating disk 300 is had preferable streamline construction in rotation process, is made resistance smaller, stress is more It is good, so as to reduce energy consumption and the abrasive action to the first drill bit 200, improve the service life of the first drill bit 200.

In order to further reduce the probability that drilling occurs track and deviateed, in free end of the rotating disk 300 away from the first drill bit 200 Connecting rod 500 is provided with, free end of the connecting rod 500 away from rotating disk 300 is provided with the 3rd drill bit 600.Rotated in rotating shaft 100 When, drive rotating disk 300 to rotate by the first drill bit 200, and drive connecting rod 500 to rotate by rotating disk 300, in connecting rod 500 Three drill bits 600 are used to be crept into the radial direction of rotating shaft 100, further expand the scope of drilling, while connecting rod 500 Rotation it is identical with the line of rotary shaft 100 of the first drill bit 200 and rotating disk 300, can make the first drill bit 200 rapidly and accurately calmly The heart, deviates so as to effectively prevent borehole trajectory, sets the 3rd drill bit 600 to also help guarantee drilling in connecting rod 500 The planarization of side wall, drilling is set to obtain preferable forming quality, therefore can be according to the actual conditions of drilling to connecting rod 500 and the The installation of three drill bits 600 is selected, and the drill bit of connecting rod 500 and the 3rd is installed additional when having certain planarization requirement to drilling outer wall 600, while be advantageous to prevent borehole trajectory from deviateing, improve drilling quality.

Specifically, the 3rd drill bit 600 is vertically arranged with the first drill bit 200, in order to which the 3rd drill bit 600 is in rotating shaft 100 Radial direction carries out drilling cutting, expands drilling scope, and the 3rd drill bit 600 tilts to the direction of the first drill bit 200, so as to The power of incline direction is applied with to the first drill bit 200, because rotating disk 300 and the first drill bit 200 are coaxially disposed, connecting rod 500 is set It is placed on rotating disk 300, the direction of the 3rd drill bit 600 to the first drill bit 200 is obliquely installed, according to concentric principle, the first drill bit 200 Can rapidly and accurately it feel relieved, the first drill bit can be ensured with joint efforts by multiple 3rd drill bits 600 is applied on the first drill bit 200 200 are crept into along planned orbit, keep the stabilization of borehole trajectory, are deviateed so as to effectively prevent borehole trajectory, are reduced The probability that drill bit fractures, the service life of the first drill bit 200 is improved, substantially increases operating efficiency.

In the alternative of the present embodiment, connecting rod 500 uses arc-shaped connecting rod 500, and arc-shaped connecting rod 500 is rotating through Cheng Zhong, resistance is smaller, and stress is more preferable, also, the rotation direction of rotating shaft 100 is relevant with the setting of arc-shaped connecting rod 500 Property, in order that arc-shaped connecting rod 500 can obtain less resistance in rotation process, arc-shaped connecting rod 500 should be along rotating shaft 100 Direction of rotation be uniformly arranged, arc-shaped connecting rod 500 is complied with the direction of rotation of rotating shaft 100, and have in rotation process preferably Streamline construction, make resistance smaller, stress is more preferable, so as to reduce energy consumption and to the drill bit 200 of rotating disk 300 and first Abrasive action, improve the service life of the drill bit 200 of rotating disk 300 and first.

On the basis of above-mentioned embodiment, the present embodiment also provides a kind of more preferable scheme, such as Fig. 3 and Fig. 4 institutes Show, the first drill bit 200 includes spiral bit 210 and pilot bit 220, and it is remote that pilot bit 220 is arranged at spiral bit 210 At the center of the end of rotating shaft 100, pilot bit 220 is set on spiral bit 210, positioning is served to drilling and guiding is made With, spiral bit 210 can be made rapidly and accurately to feel relieved, so that drill bit is in the case of no preprocessing, it is light to realize tiltedly The positioning and drilling in face, prevent borehole trajectory from deviateing, and effectively increase the scope of application of drill bit, meanwhile, in spiral bit The shoulder of 210 ends away from rotating shaft 100 is provided with milling edge 211, pilot bit 220 is combined spiral bit 210 at a high speed The advantage of processing, and then solve on inclined-plane at a high speed, stable the problem of drilling, processing efficiency and product stability are improved, And position and the finish of drilling are ensure that simultaneously, improve the scope of application of drill bit.Because the first drill bit 200 includes fluted drill First 210 and pilot bit 220, pilot bit 220 the first drill bit 200 can be made rapidly and accurately to feel relieved, so as to further Prevent borehole trajectory to deviate, reduce the probability that drill bit fractures, improve the service life of the first drill bit 200, significantly Improve operating efficiency.

Specifically, the unbearable angle of pilot bit 220 is 120 °, and the core thickness of pilot bit 220 is 1.1mm, makes pilot drill First 220 can adapt to the inclined-plane with larger angle inclination angle scope, improve the scope of application of drill bit, ensure that the intensity of drill bit can Meet drilling demand, improve the service life of drill bit.

Sharp corner of the milling edge 211 away from spiral bit 210 is provided with rounding, also, in the rake face of milling edge 211 On be provided with protection face for protecting the wedge angle.Rounding is set to be served to milling edge 211 well on milling edge 211 Protective effect, on the rake face of milling edge 211 set protection face can effectively prevent the wedge angle of milling edge 211 or rake face excessively Sharp and damage accident, so as to strengthen the rigidity of milling edge 211, avoid milling edge 211 that tipping problem occurs, improve fried dough twist The service life of drill bit 210, it ensure that bore operation can be carried out continually and steadily.Specifically, the radius of rounding can be 0.1mm, the width of protection face can be 0.1mm, so as to ensure that milling edge 211 has obtained good protection while rapid drilling Effect.

Spiral bit 210 has the advantage of High-speed machining, further to improve the process velocity of spiral bit 210, and then Improving operating efficiency, it is preferable that a width of 0.2mm of land of spiral bit 210, the back-off depth of spiral bit 210 is 0.15mm, The angle of cutting edge of spiral bit 210 is 1 °, so that spiral bit 210 possesses good performance, so as to improve process velocity.

First drill bit 200 and the second drill bit 400 are made by Hardmetal materials, and the 3rd drill bit 600 can also be closed by hard Golden material is made, and drill bit is possessed good mechanical property, ensure that drill bit can High-speed machining, improve the use of drill bit Life-span.

Embodiment 2

Present embodiments provide the drill bit in a kind of drilling tool, including embodiment 1.Drilling tool may also include drilling rod, reamer, help Positive device etc., by being used cooperatively for a variety of drilling tools, enables drilling operation to be carried out.Pass through the edge turn on the first drill bit 200 The radial direction of axle 100 sets multiple rotating disks 300, and the second drill bit 400 is provided with rotating disk 300, and the second drill bit 400 is to the The direction of one drill bit 200 is obliquely installed, and the first drill bit 200 is rapidly and accurately felt relieved, so as to effectively prevent drilling Track deviates, and reduces the probability that drill bit fractures, improves the service life of the first drill bit 200, substantially increase work Efficiency.

Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly The scope of each embodiment technical scheme of type.

Claims (10)

1. a kind of drill bit, it is characterised in that including can around the rotating shaft (100) that own axes rotate, with the rotating shaft (100) Connected the first drill bit (200) in one end, multiple and the first drill bit (200) phase being radially arranged along the rotating shaft (100) Rotating disk (300) even；

Angle between multiple rotating disks (300) is identical, also, multiple the are evenly arranged with each rotating disk (300) Two drill bits (400), second drill bit (400) be arranged in parallel with first drill bit (200), also, second drill bit (400) tilted to the direction of first drill bit (200).

2. drill bit according to claim 1, it is characterised in that the rotating disk (300) is arc rotating disk (300), also, institute Direction of rotation protrusion of the arc rotating disk (300) along the rotating shaft (100) is stated to set.

3. drill bit according to claim 1, it is characterised in that remote first drill bit (200) of the rotating disk (300) Free end is provided with connecting rod (500), and free end of the connecting rod (500) away from the rotating disk (300) is provided with the 3rd brill Head (600)；

3rd drill bit (600) is vertically arranged with first drill bit (200), also, the 3rd drill bit (600) is to described The direction of first drill bit (200) tilts.

4. drill bit according to claim 3, it is characterised in that the connecting rod (500) is arc-shaped connecting rod (500), and And direction of rotation of the arc-shaped connecting rod (500) along the rotating shaft (100) is uniformly arranged.

5. according to the drill bit any one of claim 1-4, it is characterised in that first drill bit (200) includes fried dough twist Drill bit (210) and the pilot bit for being arranged at end center of the spiral bit (210) away from the rotating shaft (100) (220)；

The shoulder of end of the spiral bit (210) away from the rotating shaft (100) is provided with milling edge (211).

6. drill bit according to claim 5, it is characterised in that the unbearable angle of the pilot bit (220) is 120 °, institute The core thickness for stating pilot bit (220) is 1.1mm.

7. drill bit according to claim 5, it is characterised in that the milling edge (211) is away from the spiral bit (210) Sharp corner be provided with rounding, the protection face for protecting the wedge angle is provided with the rake face of the milling edge (211).

8. drill bit according to claim 5, it is characterised in that a width of 0.2mm of land of the spiral bit (210), institute The back-off depth for stating spiral bit (210) is 0.15mm, and the angle of cutting edge of the spiral bit (210) is 1 °.

9. drill bit according to claim 5, it is characterised in that first drill bit (200) and second drill bit (400) It is made by Hardmetal materials.

10. a kind of drilling tool, it is characterised in that including drill bit as claimed in any one of claims 1-9 wherein.