CN114537704A - Reverse drilling operation method - Google Patents
Reverse drilling operation method Download PDFInfo
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- CN114537704A CN114537704A CN202210083704.4A CN202210083704A CN114537704A CN 114537704 A CN114537704 A CN 114537704A CN 202210083704 A CN202210083704 A CN 202210083704A CN 114537704 A CN114537704 A CN 114537704A
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- 238000005553 drilling Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 93
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000005415 magnetization Effects 0.000 description 14
- 238000010276 construction Methods 0.000 description 7
- 238000010892 electric spark Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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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
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Abstract
The invention relates to the technical field of aircraft part assembly and manufacturing, 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. enabling iron powder to be close to the surface of the part which is not drilled through, and forming an iron powder pile in the shape of the tail end of the drill bit on the surface of the part; C. drilling reversely according to the top of the iron powder pile; the reverse drilling operation method provided by the invention is not influenced by the shape or volume of the part, the corresponding drilling central 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 hole and the original drilling hole deviate too much is avoided, the quality problems of structural damage or aperture out-of-tolerance and the like of the part are effectively controlled, and the risk of scrapping the part is reduced.
Description
Technical Field
The invention relates to the technical field of aircraft part assembly and manufacturing, in particular to an operation method for reverse drilling.
Background
In the aircraft assembly process, spare part that thickness is within thirty millimeters needs to carry out a large amount of manual drilling work, when getting millimeter level's through-hole to the spare part that lamination is many, thickness is great, because the drill bit is tiny, the drill bit diameter is usually about three millimeters, can often take place the phenomenon of drill bit rupture in the drilling in the in-process of creeping, and generally take place in the middle and later stage of the drilling, the thickness that spare part did not bore through is generally within ten millimeters, the drilling forms the blind hole because of the drill bit rupture, and the drill bit of rupture is taken out very difficultly in tiny blind hole, the current general method of taking out the rupture drill bit has: the method comprises a vibration method, an electric spark method, a reverse drilling method and the like, wherein the vibration method shakes out the broken drill bit in a mode of shaking parts such as knocking and the like, and is not allowed to be used in the machining of large airplane parts and parts, the electric spark method is operated through an electric spark puncher, the electric spark puncher or the large airplane parts are limited by volume and space, the transportation and the punching operation are inconvenient to carry out, and the hole forming quality is difficult to guarantee.
Therefore, a reverse drilling method is often adopted in aircraft assembly, namely a method of determining a corresponding drilling center point on a surface of a part which is not drilled through, reversely drilling to the end face of a broken drill bit by using a drilling tool according to the determined center point, and knocking out the broken drill bit by using a punch is adopted.
Disclosure of Invention
The invention aims to: the reverse drilling method is used for solving the problem that a corresponding drilling central point is difficult to find on the surface of a part which is not drilled through when the reverse drilling method in the prior art is applied to parts which are large in size, irregular in shape or have arc-shaped outer surfaces or the drilling direction of a drill deviates from the surface normal of the part.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method of back-drilling operations comprising the steps of:
A. magnetizing the drill bit in the blind hole of the part by using a magnet;
B. enabling iron powder to be close to the surface of the part which is not drilled through, and forming an iron powder pile in the shape of the tail end of the drill bit on the surface of the part;
C. and reversely drilling according to the top point of the iron powder stack.
The drill bit is usually made of hard alloy with high iron content, the drill bit can be magnetized to generate a magnetic field, after the drill bit in the blind hole is magnetized, magnetic induction lines at the tail end of the drill bit from the edge to the drill point are gradually concentrated, by utilizing the characteristic that the concentration degree of the magnetic induction lines at the tail end of the drill bit is changed, when iron powder is close to the surface of a part which is not drilled through, the iron powder can be adsorbed on the surface of the part by the magnetized drill bit, the magnetic strength of the tail end of the drill bit at different positions is different along with the change of the concentration degree of the magnetic induction lines, the magnetism of the position corresponding to the drill point is strongest, the quantity of the iron powder attached to different positions on the surface of the part is different due to different magnetic strengths, the quantity of the adsorbed iron powder is the largest at the position corresponding to the drill point, the finally adsorbed iron powder can form an iron powder pile in the shape of the tail end of the drill bit, the top point of the iron powder pile corresponds to the position of the drill point of the drill bit, therefore, the top point of the iron powder pile is used as the drilling central point of the reverse drilling hole, namely, when the drilling tool is operated, the drill point of the reverse drill bit is aligned to the top point of the iron powder pile for reverse drilling;
according to the reverse drilling operation method, the iron powder pile is used for displaying the area corresponding to the drill bit in the blind hole on the surface of the part which is not drilled through, the influence of the shape or the volume of the part is avoided, the corresponding drilling center point can be determined through the iron powder pile, the phenomenon that the axial lines of the reverse drilling hole and the original drilling hole are too large in mutual deviation is avoided, the quality problems of structural damage or aperture super-difference and the like of the part are effectively controlled, and the risk of scrapping the part is reduced.
Preferably, in the step C, when the reverse drilling is performed, the drill tip of the reverse drill is drilled towards 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 the magnetic attraction of the drill bit in the blind hole can show the shape of the tail end of the drill bit and the position of a drill hole on the surface of a corresponding part which is not drilled through, and meanwhile, the direction of a connecting line of the top point of the iron powder pile and the centroid point of the bottom surface of the iron powder pile can also show the deflection angle of the drill bit in the blind hole relative to the surface normal 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 method further includes a step D:
D. and reversely drilling to the end face of the breaking drill bit, and taking out the breaking drill bit by using a punch.
If the blind hole is formed by suddenly breaking the drill bit in the construction of drilling the through hole, the broken drill bit can be quickly taken out through the step D, and the reverse drilling and the blind hole can be combined to form the through hole;
the reverse drilling operation method is suitable for the phenomenon of drill bit breakage in the construction of drilling through holes, can solve the problem of drill bit breakage under the working conditions that the operation space is narrow, parts have arc structures, the drilling direction of the drill bit deviates from the surface normal of the parts and the like, avoids overlarge mutual deviation of the axes of the reverse drilling hole and the blind hole, simultaneously does not need to move and disassemble the parts, effectively controls the generation of quality problems of structural damage of the parts or over-tolerance of the aperture of the through hole and the like, reduces the influence of the reverse drilling hole on the quality of the through hole, does not damage the structure of an airplane, can obtain a complete through hole, and reduces the risk of scrapping the parts.
Preferably, in the step C, the back drilling is performed using a back drill having a diameter smaller than that of the breaking drill.
The reverse drill bit with smaller diameter is used for reverse drilling to form a working channel of the punch, the broken drill bit is taken out, and then the blind hole is drilled through in the blind hole, so that the construction of the through hole can be completed.
Preferably, in the step a, the magnet and the broken surface of the drill bit are attached to each other for magnetization.
If the fracture surface of the drill bit is positioned outside the blind hole, namely the fractured 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 a 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 broken surface of the drill bit are connected with each other by using a magnetic conduction rod for magnetization.
If the broken 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 magnetization can be indirectly carried out through the magnetic conduction rod; 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 spare part is magnetized the back, because the magnetic permeability of spare part and drill bit is different, the spare part even can adsorb the iron powder, can not obviously influence the iron powder and pile the formation in the spare part does not bore the drill bit corresponding region on the surface, and the summit of iron powder heap also can show the drill point position, but also need the magnetization of minimizing spare part, and then reduce the change of spare part physics and chemical properties, reduce the unnecessary adsorption capacity of spare part to the iron powder simultaneously, it is more clear visible to do benefit to the demonstration of iron powder heap, be convenient for judge and carry out operation on next step.
Preferably, in the step a, a magnetic conducting rod with a diameter smaller than that of the breaking bit is used.
If the parts contain magnetic materials, the magnetic conducting rod with the diameter smaller than that of the broken drill bit is used, and the magnetic conducting rod can not directly contact the parts, so that the magnetization effect of the magnet on the parts is further reduced.
Preferably, in the step a, the annular magnet is sleeved around the magnetic conduction rod.
If the parts are materials which can not be magnetized, such as conventional aluminum alloy structural members, when the magnetic conduction rod is used, the conventional annular magnet is sleeved on the magnetic conduction 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 invention has the beneficial effects that:
1. according to the reverse drilling operation method, the iron powder pile is used for displaying the area corresponding to the drill bit in the blind hole on the surface of the part which is not drilled through, the influence of the shape or the volume of the part is avoided, the corresponding drilling central point can be determined through the iron powder pile, the phenomenon that the axial lines of the reverse drilling hole and the original drilling hole are too large in mutual deviation is avoided, the quality problems of structural damage or aperture super-difference and the like of the part are effectively controlled, and the risk of scrapping the part is reduced;
2. through the design of the magnetic conduction rod, when the broken section of the drill bit is positioned in the blind hole and the magnet cannot stretch into the tiny blind hole, the drill bit is convenient to magnetize, the magnet can be prevented from directly contacting 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 of structural damage or aperture super-difference of parts and the like are further reduced;
4. the reverse drilling operation method is suitable for the phenomenon of drill bit breakage in the construction of drilling through holes, can solve the problem of drill bit breakage under the working conditions that the operation space is narrow, parts have arc structures, the drilling direction of the drill bit deviates from the surface normal of the parts and the like, avoids overlarge mutual deviation of the reverse drilling and the axis of a blind hole, simultaneously does not need to move and disassemble the parts, effectively controls the generation of quality problems of structural damage of the parts or over-tolerance of the aperture of the through hole and the like, reduces the influence of the reverse drilling on the quality of the through hole, does not damage the structure of an airplane, and can obtain a complete through hole. The risk of scrapping parts is reduced.
Drawings
FIG. 1 is a schematic view showing the magnetization of a magnet according to example 2;
FIG. 2 is a schematic representation of a reverse drill of the embodiment 2;
FIG. 3 is a schematic view showing the use of the punch according to embodiment 2;
FIG. 4 is a schematic view of the parts of example 2 having curved surfaces;
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 view of the use of the magnetic conducting rod of example 3;
the labels in the figure are: 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 conducting rod.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention.
Example 1
The invention relates to an operation method of reverse drilling, which comprises the following steps:
A. magnetizing a drill bit 4 in a blind hole 3 of the part 2 by using a magnet 1;
B. iron powder is close to the surface of the part 2 which is not drilled through, and an iron powder pile 5 in the shape of the tail end of a drill 4 is formed on the surface of the part 2;
C. the reverse drilling is performed according to the apex of the iron powder pile 5.
In the embodiment, a part 2 already assembled on an airplane body is drilled, the operation space is narrow, the part 2 is not convenient to move and difficult to turn over, the part 2 is an aluminum alloy structural member with the thickness of 8mm, a drill bit 4 with the diameter of 2.6mm is used for drilling, a blind hole 3 with the depth of 3mm is drilled on the upper surface 21 of the part 2, the drill bit 4 is not taken out, and at the moment, a blind hole 3 needs to be drilled on the lower surface 22 of the part 2, and the blind holes 3 on the upper surface and the lower surface of the part 2 are required to be on the same axis;
carrying out the step A: selecting a strip-shaped strong magnet 1, wherein the magnet 1 is a neodymium iron boron magnet, mutually attaching the strong magnet 1 and the part of the drill bit 4, which exposes the blind hole 3, to each other, and finishing the magnetization of the drill bit 4, 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;
and B, performing the step B: predicting a rough area of the blind hole 3 corresponding to the lower surface 22 of the part 2, using a pile of iron powder to approach the area or directly contacting the iron powder with the surface of the area, adsorbing part of the iron powder on the lower surface 22 of the part 2 due to the magnetic attraction of the magnetized drill 4 at the position 5mm away from the lower surface 22 of the part 2, and forming a densest iron powder pile 5 in the area corresponding to the forward direction of the drill 4 in the blind hole 3, wherein the three-dimensional shape of the iron powder pile 5 is approximately equivalent to the shape of the tail end of the drill 4, and the formed iron powder pile 5 is approximately conical due to the small drill point of the drill 4 of 2.6 mm;
and C, performing the step C: keeping a drill bit 4 in a blind hole 3 on the upper surface 21 of the part 2 still, drilling the blind hole 3 on the lower surface 22 of the part 2 by using another reverse drill bit 7 with the diameter of 2.6mm, aligning the drill point of the reverse drill bit 7 to the top point of the iron powder pile 5, drilling the blind hole 3 with the depth of 3mm by taking the center of the top point of the iron powder pile 5 facing the circular bottom surface of the iron powder pile 5 as the drilling direction, and completing the construction of the two blind holes 3 on the upper surface 22 and the lower surface 22 of the part 2, wherein the two blind holes 3 are positioned on the same axis, and the bottoms of the two blind holes 3 are separated by 2 mm.
Example 2
Different from the embodiment 1, as shown in fig. 1, the drill bit 4 with a diameter of 2.6mm is used to drill the through hole, when the drilling depth of the upper surface 21 of the component 2 reaches 5mm, the drill bit 4 breaks, the broken surface of the drill bit 4 is flush with the surface 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:
carrying out the step A: a strip-shaped strong magnet 1 is selected, the strong magnet 1 is tightly attached to the drill hole on the surface of the part 2, namely the strong magnet is mutually attached to the fracture surface of the drill bit 4, and the magnetization of the fractured drill bit 4 is completed;
and B, performing the step B: firstly, predicting a rough 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 contacting the iron powder with the surface of the area to form an approximately conical iron powder pile 5;
and C, performing the step C: as shown in fig. 2, a drill 4 with a diameter smaller than that of the broken drill 4 is selected for reverse drilling, that is, a reverse drill 7 with a diameter of 2.0mm is selected for drilling on the lower surface 22 of the component 2, and the drill point of the reverse drill 7 is aligned with the top point of the iron powder pile 5, and the center of the circle of the iron powder pile 5 facing the circular bottom surface of the iron powder pile 5 is taken as the drilling direction;
because the broken drill 4 drills in a direction perpendicular to the upper surface 21 of the part 2, the vertex of the iron powder pile 5 and the center of the circular bottom surface of the iron powder pile 5 are theoretically located on the same vertical plane, in practical operation, the vertex of the iron powder pile 5 is usually aimed at to drill reversely upwards, when the reverse drill 7 is magnetic, in order to avoid the influence on the stability of the iron powder pile 5 when the reverse drill 7 is close to the iron powder pile 5, in practical operation, the outline of the iron powder pile 5 can be drawn on the lower surface 22 of the part 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 tip alignment point of the reverse drill 7;
and D, performing the step D: drilling a drill hole with the depth of 3mm, namely reversely drilling 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 to finish the quick taking out of the broken drill bit 4, finally, replacing a brand new drill bit 4 with 2.6mm, and continuously finishing the 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 a curved surface, the method can be applied, and as shown in fig. 5, if the drilling direction of the drill 4 deviates from the normal line of the surface of the component 2, that is, the drilling direction has a certain inclination angle with respect to the normal line of the surface of the component 2, the vertex of the cone formed by the iron powder pile 5 also has a corresponding inclination angle with respect to the center of the bottom surface of the cone, and when performing the back drilling, the drill point of the back drill 7 is drilled at the vertex of the iron powder pile 5 toward the center point of the bottom surface of the iron powder pile 5, that is, the back drilling is performed according to the inclination angle.
Example 3
The invention relates to an operation method of reverse drilling, which comprises the following steps:
A. magnetizing a drill bit 4 in a blind hole 3 of the part 2 by using a magnet 1;
B. iron powder is close to the surface of the part 2 which is not drilled through, and an iron powder pile 5 in the shape of the tail end of a drill 4 is formed on the surface of the part 2;
C. the reverse drilling is performed according to the apex 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 drilling of the through hole is continuously completed, the areas of the upper and lower surfaces 22 of the component 2 are large and inconsistent, it is difficult to accurately determine the area of the blind hole 3 corresponding to the lower surface 22 of the component 2 by methods such as scribing, and the following methods are adopted to perform the processing:
carrying out the step A: selecting an annular strong magnet 1 and a magnetic conduction rod 8 with the diameter equivalent to that of the breaking 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, using the annular strong magnet 1 to sleeve the iron rod and placing the iron rod on the upper surface 21 of the part 2, contacting the side wall of the annular strong magnet 1 with the iron rod, and finishing the magnetization of the breaking drill bit 4 through the magnetic conduction rod 8;
and B, performing the step B: firstly, predicting a rough 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 contacting the iron powder with the surface of the area, wherein the iron powder pile 5 with a tip and an approximately I-shaped bottom surface is formed because the drill bit 4 has a larger diameter and the protrusion of the drill bit is not obvious enough;
and C, performing the step C: a reverse drill bit 7 with the diameter smaller than that of the broken drill bit 4 is selected for reverse drilling, the 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 tip of the reverse drill bit 7 is aligned to the top point of the iron powder pile 5, and the center point of the top point of the iron powder pile 5 facing to the linear bottom surface of the iron powder pile 5 is taken as the drilling direction;
and D, performing the step D: drilling a drill hole with the depth of 8mm, namely reversely drilling 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 to finish the quick taking out of the broken drill bit 4, finally, replacing a brand-new 4mm drill bit 4, and continuously finishing the 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 drill bit 4 of breaking is in spare part 2 blind hole 3 that has magnetic material, spare part 2 itself also can be magnetized promptly, then use the magnetic conduction stick 8 that is less than the drill bit 4 diameter of breaking, for example, the diameter is 2 mm's iron bar, and put into the central point of blind hole 3 with magnetic conduction stick 8, avoid magnetic conduction stick 8 and spare part 2 to contact each other, choose cubic powerful magnet 1 to place in the end of magnetic conduction stick 8 for the while, make powerful magnet 1 also not with spare part 2 direct contact, can reduce the magnetization of powerful magnet 1 to spare part 2 as far as possible, reduce the influence that spare part 2 magnetizes and adsorb the iron powder, do benefit to iron powder heap 5 and clearly demonstrate the required drilling central point of carrying out reverse drilling, and then be convenient for judge and carry out operation on next step.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A method of reverse drilling operation, comprising the steps of:
A. magnetizing a drill bit (4) in a blind hole (3) of a part (2) by using a magnet (1);
B. iron powder is close to the surface of the part (2) which is not drilled through, and an iron powder pile (5) in the shape of the tail end of a drill bit (4) is formed on the surface of the part (2);
C. and reversely drilling according to the top point of the iron powder pile (5).
2. A method of operation of reverse drilling according to claim 1, C h a r a C t e r i z e d in that in step C, the reverse drilling is performed by drilling the tip of the reverse drill (7) at the top of the iron pile (5) towards the centroid of the bottom surface of the iron pile (5).
3. The method of claim 1, wherein the step A, if the broken drill bit (4) in the blind hole (3) needs to be removed, further comprises the step D:
D. and reversely drilling to the end face of the breaking drill bit (4), and taking out the breaking drill bit (4) by using a punch (6).
4. A method of back-drilling according to claim 3, characterized in that in step C, a back-drill (7) having a diameter smaller than the diameter of the breaking-off drill (4) is used for back-drilling.
5. A method as claimed in claim 3, wherein in step a, the magnet (1) and the bit (4) are magnetized by abutting against each other.
6. A method as claimed in claim 3, wherein in step a, the magnet (1) and the bit (4) are magnetized by connecting them with a magnetic conductive rod (8).
7. A method of back-drilling according to claim 6, wherein in step A, a magnetically conductive rod (8) having a diameter smaller than the diameter of the break-off bit (4) is used.
8. The reverse drilling operation method according to claim 6, wherein in the step A, the ring-shaped magnet (1) is selected to be sleeved around the magnetic conducting rod (8).
9. A method of back-drilling according to claim 1, wherein in step a, said magnet (1) is a strong magnet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210083704.4A CN114537704B (en) | 2022-01-19 | 2022-01-19 | Reverse drilling operation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210083704.4A CN114537704B (en) | 2022-01-19 | 2022-01-19 | Reverse drilling operation method |
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| CN114537704A true CN114537704A (en) | 2022-05-27 |
| CN114537704B CN114537704B (en) | 2023-08-04 |
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