CN114537704B - Reverse drilling operation method - Google Patents
Reverse drilling operation method Download PDFInfo
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- CN114537704B CN114537704B CN202210083704.4A CN202210083704A CN114537704B CN 114537704 B CN114537704 B CN 114537704B CN 202210083704 A CN202210083704 A CN 202210083704A CN 114537704 B CN114537704 B CN 114537704B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/10—Manufacturing or assembling aircraft, e.g. jigs therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to the technical field of assembly and manufacture of airplane parts, and discloses an operation method for reverse drilling, which comprises the following steps: A. magnetizing the drill bit in the blind hole of the part by using a magnet; B. the iron powder is close to the surface of the part, which is not penetrated, and an iron powder pile in the shape of the tail end of the drill bit is formed on the surface of the part; C. reversely drilling holes according to the vertexes of the iron powder piles; according to the operation method for reverse drilling, the influence of the shape or the volume of the part is avoided, the corresponding drilling center point can be found on the surface of the part which is not drilled through, the phenomenon that the axial lines of the reverse drilling and the original drilling deviate too much is avoided, the quality problems of structural damage or out-of-tolerance aperture of the part are effectively controlled, and the scrapping risk of the part is reduced.
Description
Technical Field
The invention relates to the technical field of assembly and manufacture of aircraft parts, in particular to an operation method for reverse drilling.
Background
In the aircraft assembly process, a great amount of manual drilling work is required for parts with the thickness within thirty millimeters, when millimeter-level through holes are drilled on parts with multiple layers and larger thickness, the phenomenon that the drill bit is broken in the drill holes frequently occurs in the drilling process due to the tiny drill bit, the thickness of the parts which are not drilled is generally within ten millimeters in the middle and later stages of drilling, the drill holes are broken to form blind holes, the broken drill bit is difficult to take out in the tiny blind holes, and the conventional method for taking out the broken drill bit comprises the following steps: vibration method, electric spark method, reverse drilling method etc. the vibration method shakes out the broken drill bit through the mode of striking etc. vibration spare part, and the electric spark method is operated through electric spark puncher in aircraft major part and parts processing, and electric spark puncher or aircraft major part all receive volume space's restriction, and the transportation and the operation of punching are not convenient for make a round trip, and pore-forming quality is difficult to guarantee.
Therefore, in the aircraft assembly, a reverse drilling method is often adopted, namely, the corresponding drilling center point on the surface of the part which is not drilled is determined, a drilling tool is used for reversely drilling the surface of the broken drill bit according to the determined center point, and then the broken drill bit is knocked out by a punch.
Disclosure of Invention
The invention aims at: aiming at the problems that when the reverse drilling method is applied to parts with large size and irregular shape or arc-shaped outer surfaces or the drilling direction of a drill bit deviates from the normal of the surfaces of the parts, the corresponding drilling center point is difficult to find on the surface of the part which is not drilled, the reverse drilling operation method is provided, the corresponding drilling center point can be found on the surface of the part which is not drilled without being influenced by the shape or the volume of the part, the mutual deviation of the axes of the reverse drilling and the original drilling is avoided to be too large, the occurrence of quality problems such as structural damage or excessive aperture of the part is effectively controlled, and the scrapping risk of the part is reduced.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method of reverse drilling operations comprising the steps of:
A. magnetizing the drill bit in the blind hole of the part by using a magnet;
B. the iron powder is close to the surface of the part, which is not penetrated, and an iron powder pile in the shape of the tail end of the drill bit is formed on the surface of the part;
C. and reversely drilling according to the vertex of the iron powder pile.
The drill bit is usually made of hard alloy with higher iron content, the drill bit can be magnetized to generate a magnetic field, after the drill bit in the blind hole is magnetized, the magnetic induction lines at the position from the edge to the drill tip of the drill bit are gradually concentrated, when the iron powder is close to the surface of the part which is not penetrated by the drill bit, the magnetized drill bit is adsorbed on the surface of the part, and along with the change of the magnetic induction lines, the magnetic intensity of the drill bit at different positions is also different, the magnetic intensity of the position corresponding to the drill tip is strongest, the corresponding adsorbed iron powder is different in the different magnetic intensity, the amount of the iron powder attached at different positions on the surface of the part is also different, the position corresponding to the drill tip is the largest, finally the adsorbed iron powder can form an iron powder pile in the shape of the drill bit end, and the vertex of the iron powder pile corresponds to the drill tip position of the drill bit, so that the vertex of the iron powder pile is used as the drilling center point of the reverse drilling hole, namely, when the drilling tool is operated, the drill tip of the reverse drill bit is aligned with the vertex of the iron powder pile to carry out reverse drilling;
according to the operating method for reverse drilling, the areas corresponding to the drill bits in the blind holes are displayed on the surface of the parts, which are not drilled through, through the iron powder pile, the influences of the shapes or the volumes of the parts are avoided, the corresponding drilling center points can be determined through the iron powder pile, the phenomenon that the axes of the reverse drilling and the original drilling deviate too much is avoided, the quality problems of structural damage or the out-of-tolerance aperture of the parts are effectively controlled, and the scrapping risk of the parts is reduced.
Preferably, in the step C, when the back drilling is performed, the drill tip of the back drill is drilled toward the centroid point of the bottom surface of the iron powder pile at the top point of the iron powder pile.
The iron powder pile formed by magnetic attraction of the drill bit in the blind hole not only can display the shape of the tail end of the drill bit and the position of the drill hole on the surface where the corresponding part is not drilled, but also can display the deflection angle of the drill bit in the blind hole relative to the normal line of the surface of the part, namely the drilling direction of the drill bit in the blind hole.
Preferably, in the step a, if the broken drill bit in the blind hole needs to be removed, the step D further includes:
D. and reversely drilling to the end face of the broken drill bit, and taking out the broken drill bit by using a punch.
If the blind hole is formed by snapping the drill bit in the construction of drilling the through hole, the snapped drill bit can be quickly taken out through the step D, and the reverse drilling hole and the blind hole can be combined to form the through hole;
the operation method of the reverse drilling is suitable for the phenomenon of drill bit breakage in the construction of drilling through holes, can solve the problems of drill bit breakage under the working conditions that the operation space is narrow, the parts have an arc structure, the drilling direction of the drill bit deviates from the normal of the surfaces of the parts and the like, avoids the mutual deviation of the axes of the reverse drilling and the blind holes to be too large, does not need to move and disassemble the parts, effectively controls the generation of quality problems such as structural damage of the parts or the out-of-tolerance of the aperture of the through holes, reduces the influence of the reverse drilling on the quality of the through holes, does not damage the aircraft structure, can obtain a complete through hole, and reduces the scrapping risk of the parts.
Preferably, in the step C, a back drill having a diameter smaller than that of the broken drill is used for back drilling.
The reverse drill bit with smaller diameter is used for reverse drilling, a working channel of the punch is formed, after the broken drill bit is taken out, the blind hole is continuously drilled through in the blind hole, and then the construction of the through hole can be completed.
Preferably, in the step a, the magnets and the fracture surface of the drill bit are bonded to each other for magnetization.
If the fracture surface of the drill bit is positioned outside the blind hole, namely the broken drill bit is provided with a part protruding out of the blind hole, or the fracture surface of the drill bit is flush with the surface of the part, the magnet can be directly contacted with the drill bit for magnetization, and the operation is simple.
Preferably, in the step a, the magnet and the fracture surface of the drill bit are connected to each other by using a magnetic conductive rod for magnetization.
If the fracture surface of the drill bit is positioned in the blind hole, the magnet can not extend into the tiny blind hole to magnetize the drill bit, and the magnetic rod can be used for indirectly magnetizing the drill bit; or when the parts contain magnetic materials, namely the parts can be magnetized, the magnet is not directly contacted with the parts through the magnetic conduction rod, so that the magnetization effect of the magnet on the parts can be reduced;
although the magnetic permeability of the parts is different from that of the drill bit after the parts are magnetized, even though the parts adsorb iron powder, the parts can not obviously influence the formation of the iron powder pile in the corresponding area of the drill bit on the non-drilled surface of the parts, and the vertex of the iron powder pile can also display the drill point position, but the magnetization of the parts is also required to be reduced as much as possible, so that the change of the physical and chemical properties of the parts is reduced, and meanwhile, the unnecessary adsorption quantity of the parts to the iron powder is reduced, so that the iron powder pile is more clearly visible in display, and the judgment is convenient for the next operation.
Preferably, in the step a, a magnetically permeable rod having a diameter smaller than the diameter of the broken bit is used.
If the parts contain magnetic materials, the magnetic conducting rod smaller than the diameter of the broken drill bit is used, and the magnetic conducting rod can not directly contact with the parts, so that the magnetization effect of the magnet on the parts is further reduced.
Preferably, in the step a, the ring magnet is sleeved around the magnetic conductive rod.
If the parts are made of materials which cannot be magnetized, such as conventional aluminum alloy structural members, when the magnetic rod is used, the conventional annular magnet is sleeved on the magnetic rod, so that the magnetization operation is facilitated.
Preferably, in the step a, the magnet is a strong magnet.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. according to the operating method for reverse drilling, the areas corresponding to the drill bits in the blind holes are displayed on the surface of the parts, which are not drilled through, through the iron powder pile, the shapes or the volumes of the parts are not affected, the corresponding drilling center points can be determined through the iron powder pile, the phenomenon that the axes of the reverse drilling and the original drilling deviate too much is avoided, the quality problems of structural damage or the out-of-tolerance aperture of the parts are effectively controlled, and the scrapping risk of the parts is reduced;
2. through the design of the magnetic conduction rod, when the fracture surface of the drill bit is positioned in the blind hole, the magnet can not extend into the tiny blind hole, so that the drill bit can be magnetized conveniently, the magnet can be prevented from directly contacting with parts, and the magnetization effect of the magnet on the parts is reduced;
3. by utilizing the angle relation between the top point of the iron powder pile and the centroid point of the bottom surface of the iron powder pile, the deviation in the drilling direction during reverse drilling can be effectively controlled, and the quality problems such as structural damage or out-of-tolerance pore diameter of parts are further reduced;
4. the operation method of the reverse drilling is suitable for the phenomenon of drill bit breakage in the construction of drilling through holes, can solve the problems of drill bit breakage under the working conditions that the operation space is narrow, the parts have an arc structure, the drilling direction of the drill bit deviates from the normal of the surfaces of the parts and the like, avoids the mutual deviation between the reverse drilling and the blind hole axis to be too large, does not need to move and disassemble the parts, effectively controls the generation of quality problems such as structural damage of the parts or the out-of-tolerance of the hole diameter of the through holes, reduces the influence of the reverse drilling on the quality of the through holes, does not damage the aircraft structure, and can obtain a complete through hole. The risk of scrapping parts is reduced.
Drawings
FIG. 1 is a schematic diagram of magnetization of a magnet according to example 2;
FIG. 2 is a schematic view of a reverse drill bit of example 2 for reverse drilling;
FIG. 3 is a schematic illustration of the use of the punch of example 2;
FIG. 4 is a schematic view of the component part of embodiment 2 with a curved surface;
FIG. 5 is a schematic view showing the inclination of the drilling direction of the drill bit according to example 2;
FIG. 6 is a schematic diagram of the use of the magnetically permeable rod of example 3;
the marks in the figure: 1-magnet, 2-parts, 21-upper surface, 22-lower surface, 3-blind hole, 4-drill bit, 5-iron powder pile, 6-punch, 7-reverse drill bit and 8-magnetic conduction rod.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and examples, it being understood that the specific examples described herein are for the purpose of illustration only and are not intended to limit the present invention.
Example 1
The invention discloses an operation method of reverse drilling, which comprises the following steps:
A. magnetizing the drill bit 4 in the blind hole 3 of the part 2 by using the magnet 1;
B. the iron powder is close to the surface of the part 2 which is not penetrated, and an iron powder pile 5 in the shape of the tail end of the drill bit 4 is formed on the surface of the part 2;
C. the back drilling is performed according to the top point of the iron powder pile 5.
In this embodiment, the drilling operation is performed on the component 2 assembled on the aircraft body, the operation space is relatively narrow, the component 2 is inconvenient to move, and it is difficult to turn over the component 2, the component 2 is an aluminum alloy structural member with a thickness of 8mm, and the drilling operation is performed by using a drill bit 4 with a diameter of 2.6mm, firstly, a blind hole 3 with a depth of 3mm is drilled on the upper surface 21 of the component 2, the drill bit 4 is not yet taken out, at this time, a blind hole 3 needs to be drilled on the lower surface 22 of the component 2, and the blind holes 3 on the upper surface and the lower surface of the component 2 are required to be on the same axis;
step A is carried out: selecting a strip-shaped powerful magnet 1, wherein the magnet 1 is a neodymium iron boron magnet, attaching the powerful magnet 1 and the part of the drill bit 4, which exposes the blind hole 3, to each other, wherein the part of the drill bit 4, which exposes the blind hole 3, is the part of the drill bit 4, which protrudes out of the upper surface 21 of the part 2, so as to complete magnetization of the drill bit 4;
and (C) performing the step B: firstly, predicting the approximate area of the blind hole 3 corresponding to the lower surface 22 of the part 2, using a pile of iron powder to be close to the area or directly contact the iron powder with the surface of the area, wherein part of the iron powder is adsorbed on the lower surface 22 of the part 2 due to the magnetic attraction of a magnetized drill bit 4 at the position 5mm away from the lower surface 22 of the part 2, the area corresponding to the drill bit 4 in the forward direction in the blind hole 3 can form a most dense iron powder pile 5, the three-dimensional shape of the iron powder pile 5 is approximately equal to the shape of the tail end of the drill bit 4, and the formed iron powder pile 5 is approximately conical due to the small drill tip of the drill bit 4 with the length of 2.6 mm;
and C, performing the step: the drill bit 4 in the blind hole 3 on the upper surface 21 of the part 2 is kept still, the other reverse drill bit 7 with the diameter of 2.6mm is used for drilling the blind hole 3 on the lower surface 22 of the part 2, the drill tip of the reverse drill bit 7 is aligned with the vertex of the iron powder pile 5, the vertex of the iron powder pile 5 faces the circle center of the round bottom surface of the iron powder pile 5 to serve as a drilling direction, the blind hole 3 with the depth of 3mm is drilled, the construction of the two blind holes 3 on the upper surface 22 and the lower surface 22 of the part 2 is completed, the two blind holes 3 are positioned on the same axis, and the bottoms of the two blind holes 3 are 2mm apart.
Example 2
Unlike in example 1, as shown in fig. 1, the drill 4 with a diameter of 2.6mm was used for the drilling operation of the through hole, when the drilling depth of the upper surface 21 of the component 2 reached 5mm, the drill 4 was broken, the broken surface of the drill 4 was flush with the surface of the component 2, and at this time, the broken drill 4 was required to be taken out, and the drilling of the through hole was continued to be completed:
step A is carried out: selecting a strip-shaped powerful magnet 1, and tightly attaching the powerful magnet 1 to a drilling hole on the surface of the part 2, namely mutually attaching the powerful magnet to the fracture surface of the drill bit 4 to finish magnetization of the broken drill bit 4;
and (C) performing the step B: firstly, predicting the approximate area of the blind hole 3 corresponding to the lower surface 22 of the part 2, and forming an approximately conical iron powder pile 5 by using a pile of iron powder to be close to the area or directly enabling the iron powder to be in contact with the surface of the area;
and C, performing the step: as shown in fig. 2, a drill bit 4 with a diameter smaller than that of the broken drill bit 4 is selected for reverse drilling, namely, a reverse drill bit 7 with a diameter of 2.0mm is selected for drilling on the lower surface 22 of the part 2, the drill tip of the reverse drill bit 7 is aligned with the top point of the iron powder pile 5, and the top point of the iron powder pile 5 faces the circle center of the circular bottom surface of the iron powder pile 5 to be used as the drilling direction;
because the broken drill bit 4 is perpendicular to the upper surface 21 of the component 2 for drilling, the top point of the iron powder pile 5 and the center of the circle of the round bottom surface of the iron powder pile 5 are theoretically located on the same vertical surface, in actual operation, the top point of the iron powder pile 5 is usually aligned to vertically drill reversely, when the reverse drill bit 7 has magnetism, in order to avoid the influence on the stability of the iron powder pile 5 when the reverse drill bit 7 approaches the iron powder pile 5, in actual operation, the outline of the iron powder pile 5 can be drawn on the lower surface 22 of the component 2 according to the formed iron powder pile 5, and then the reverse drill is performed according to the centroid point of the outline as the drill point alignment point of the reverse drill bit 7;
and D, performing the step: drilling a drill hole with the depth of 3mm, namely reversely drilling the drill hole to the end face of the broken drill bit 4, forming a small-diameter through hole at the bottom of the blind hole 3, ejecting the broken drill bit 4 out of the blind hole 3 from the reversely drilled through hole by using a punch 6, completing quick extraction of the broken drill bit 4, finally replacing a brand new drill bit 4 with the depth of 2.6mm, and continuing to complete construction of the through hole from the blind hole 3 on the upper surface 21 of the part 2, namely reaming the reversely drilled small-diameter through hole.
As shown in fig. 4, when the outer surface of the component 2 is curved, the method can be applied at the same time, as shown in fig. 5, if the drilling direction of the drill bit 4 deviates from the normal line of the surface of the component 2, that is, if the drilling direction has a certain inclination angle with respect to the normal line of the surface of the component 2, the cone formed by the iron powder pile 5 has a corresponding inclination angle with respect to the center of the bottom surface of the cone, and when the reverse drilling is performed, the drill tip of the reverse drill bit 7 drills toward the centroid point of the bottom surface of the iron powder pile 5 at the apex of the iron powder pile 5, that is, the reverse drilling is performed according to the inclination angle.
Example 3
The invention discloses an operation method of reverse drilling, which comprises the following steps:
A. magnetizing the drill bit 4 in the blind hole 3 of the part 2 by using the magnet 1;
B. the iron powder is close to the surface of the part 2 which is not penetrated, and an iron powder pile 5 in the shape of the tail end of the drill bit 4 is formed on the surface of the part 2;
C. the back drilling is performed according to the top point of the iron powder pile 5.
In this embodiment, the component 2 is a single flat aluminum alloy structural member with a thickness of 20mm, and a drill bit 4 with a diameter of 4mm is used to drill a through hole on the upper surface 21 of the component 2, when the drilling depth reaches 12mm, the drill bit 4 is broken, as shown in fig. 6, the broken surface of the drill bit 4 is in the blind hole 3, that is, the broken surface of the drill bit 4 is in the middle position of the component 2, at this time, the broken drill bit 4 needs to be taken out, and the drilling of the through hole is continuously completed, the areas of the upper surface 22 and the lower surface 22 of the component 2 are large and inconsistent, and it is difficult to accurately determine the area of the blind hole 3 corresponding to the lower surface 22 of the component 2 by a scribing method, and the following method is adopted for processing:
step A is carried out: selecting an annular powerful magnet 1, selecting a magnetic conduction rod 8 with the diameter equivalent to that of the broken drill bit 4, namely selecting an iron rod with the diameter of 4mm to extend into the blind hole 3, attaching one end of the iron rod to the broken end face of the part 2, protruding the other end of the iron rod out of the upper surface 21 of the part 2, sleeving the iron rod by using the annular powerful magnet 1 and placing the iron rod on the upper surface 21 of the part 2, contacting the side wall of the annular powerful magnet 1 with the iron rod, and finishing magnetization of the broken drill bit 4 through the magnetic conduction rod 8;
and (C) performing the step B: firstly, predicting the approximate area of the blind hole 3 corresponding to the lower surface 22 of the part 2, and using a pile of iron powder to be close to the area or directly contact the iron powder with the surface of the area, wherein the iron powder pile 5 with a tip and a bottom surface which is approximately in a straight shape is formed due to the fact that the diameter of the drill bit 4 is large and the protrusion of the drill bit is not obvious enough;
and C, performing the step: a reverse drill bit 7 with the diameter smaller than that of the broken drill bit 4 is selected for reverse drilling, a reverse drill bit 7 with the diameter of 3.1mm can be selected for drilling on the lower surface 22 of the part 2, the drill point of the reverse drill bit 7 is aligned with the vertex of the iron powder pile 5, and the vertex of the iron powder pile 5 faces towards the centroid point of the straight bottom surface of the iron powder pile 5 to be used as the drilling direction;
and D, performing the step: drilling a drill hole with the depth of 8mm, namely reversely drilling the drill hole to the end face of the broken drill bit 4, forming a small-diameter through hole at the bottom of the blind hole 3, ejecting the broken drill bit 4 out of the blind hole 3 from the reversely drilled through hole by using a punch 6, completing quick extraction of the broken drill bit 4, finally replacing a brand new 4mm drill bit 4, and continuing to complete construction of the through hole from the blind hole 3 on the upper surface 21 of the part 2, namely reaming the reversely drilled small-diameter through hole.
If the broken drill bit 4 is in the blind hole 3 of the part 2 with magnetic material, that is, the part 2 itself will be magnetized, then a magnetic conduction rod 8 smaller than the diameter of the broken drill bit 4, for example, an iron rod with the diameter of 2mm is used, and the magnetic conduction rod 8 is placed in the center of the blind hole 3, so that the magnetic conduction rod 8 and the part 2 are prevented from contacting each other, meanwhile, the block-shaped powerful magnet 1 is selected to be placed at the end of the magnetic conduction rod 8, so that the powerful magnet 1 is not directly contacted with the part 2, the magnetization of the powerful magnet 1 to the part 2 can be reduced as much as possible, the influence of magnetization of the part 2 and iron powder adsorption is reduced, the iron powder pile 5 is facilitated to clearly show the drilling center point required for reverse drilling, and further the judgment is facilitated.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. A method of reverse drilling operations comprising the steps of:
A. a magnet (1) is used for magnetizing a drill bit (4) in a blind hole (3) of the part (2);
B. the iron powder is close to the surface of the part (2) which is not penetrated, and an iron powder pile (5) in the shape of the tail end of the drill bit (4) is formed on the surface of the part (2);
C. when the reverse drilling is carried out according to the top point of the iron powder pile (5), the drill point of the reverse drill bit (7) drills towards the centroid point of the bottom surface of the iron powder pile (5) at the top point of the iron powder pile (5), and the reverse drill bit (7) with the diameter smaller than that of the drill bit (4) is used for carrying out the reverse drilling;
D. and reversely drilling to the end face of the drill bit (4), and taking out the drill bit (4) by using a punch (6).
2. A method of reverse drilling according to claim 1, wherein in step a, the magnets (1) are magnetized in contact with the fracture surface of the drill bit (4).
3. A method of reverse drilling according to claim 1, wherein in step a, the magnet (1) is magnetized by interconnecting the fracture surface of the drill bit (4) with a magnetic rod (8).
4. A method of reverse drilling according to claim 3, wherein in step a, magnetically permeable rods (8) having a diameter smaller than the diameter of the drill bit (4) are used.
5. A method of reverse drilling according to claim 3, wherein in step a, the ring magnet (1) is sleeved around the magnetically permeable rod (8).
6. A method of reverse drilling according to claim 1, wherein in step a, the magnet (1) is a strong magnet.
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